IOSR Journal of Applied Physics (IOSR-JAP) is an open access international journal that provides rapid publication (within a month) of articles in all areas of physics and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in applied physics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Energy and Exergy Analysis of ETC Based Solar Air DryerIRJAES Editor
This document summarizes a study on the energy and exergy analysis of a solar air dryer using an evacuated tube collector (ETC). The study found that the first law efficiency (based on energy) of the solar air dryer is higher than the second law efficiency (based on exergy), and both efficiencies increase with higher airflow rates. The efficiencies also fluctuate during the day based on changing solar radiation levels. The document provides background on solar drying technologies, solar radiation measurement, and details of the experimental setup using a 9-tube ETC collector for the study.
The document reviews different solar drying techniques, specifically open sun drying, direct drying, and indirect drying using solar greenhouse dryers. Open sun drying is the oldest and simplest method but has disadvantages like exposure to weather, pests, and foreign materials. Greenhouse dryers allow for indirect or direct drying and offer protection while improving product quality and production rates over open sun drying. Photovoltaic-integrated greenhouse dryers provide the highest rates of production. In general, solar drying preserves agricultural products, reduces losses, and lowers costs compared to mechanical drying methods.
The Application of Solar Energy in Agricultural Systemsijtsrd
Given that one day fossil fuels will end, a need arises to find alternative fuels. Renewable energy is considered an alternative to fossil fuels and nowadays it attracts much attention. Among renewable energy sources, solar is the most important because it is available in all parts of the world. Also, this energy source is used in various industries including agriculture and it can be used in cultivating crops in the farthest corners of the world. In addition, this fuel does not cause pollution, like the other fossil fuels. Using the solar energy can be active in all agricultural areas. That will definitely help meet the increasing need for agricultural products with the increasing population. However, it is known that the agricultural land has a fixed area and, sometimes, agricultural products cannot be cultivated. That greenhouse is a method that is used nowadays and using the solar energy can help build solar greenhouses in areas far away from the city. Other applications of solar energy include irrigation, drying products, and ventilation niches. In this study, the researchers discuss some of the benefits of solar energy in agriculture. P. Boopathi "The Application of Solar Energy in Agricultural Systems" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-1 , December 2018, URL: http://www.ijtsrd.com/papers/ijtsrd19019.pdf
http://www.ijtsrd.com/engineering/agricultural-engineering/19019/the-application-of-solar-energy-in-agricultural-systems/p-boopathi
Seminar on performance evaluation of a solar tunnelIman Ghosh
The document summarizes a study evaluating the performance of a solar tunnel dryer for drying fruits and vegetables throughout the year. Key findings from the study include:
- Products dried in the solar tunnel dryer for 7-8 days were of good quality and sensory evaluation found them to be highly acceptable.
- The dryer was able to reduce the moisture content of garlic from 65% to 8.5%, chili from 77% to 7%, fenugreek from 86% to 7.2%, and aonla candy from 44% to 16% on average.
- The average thermal efficiency of the solar tunnel dryer ranged from 8.89% to 17.63% for different products dried.
This document discusses a proposed hybrid solar-electric dryer for municipal solid waste in India. It begins with background on the large quantities of municipal solid waste generated in India daily and the problems with current disposal methods. The composition and properties of municipal solid waste are described. It then provides an overview of solar drying technologies and discusses a proposed hybrid dryer that uses both solar heating and an electric heating coil. The dryer would consist of a box with a solar absorber plate and electric coil to dry waste. This could help address odor and health issues from wet waste while potentially providing fuel for boilers. In conclusion, no current system exists to dry municipal solid waste, which this hybrid approach aims to solve.
Design, fabrication and heat transfer study of green house dryer 2IAEME Publication
This document summarizes a study that designed, fabricated, and tested a greenhouse dryer to dry crops using solar energy. Experiments were conducted to dry bitter melon using both open-air drying and greenhouse drying. Measurements of solar intensity, humidity, temperature, air velocity, and moisture removal rate were recorded over time. The data was used to determine the convective heat transfer coefficient for both drying methods. It was found that the convective heat transfer coefficient was lower for greenhouse drying than open-air drying, especially at the beginning of the drying process. However, greenhouse drying helps prevent moisture loss and allows crops to be dried year-round.
A comparative study of energy demand of instant pounded yam flour production...Alexander Decker
This study analyzed the energy demand of three methods for producing instant-pounded yam flour: the cooking method, steaming method, and wet-milling method. Data was collected from nine instant-pounded yam flour factories. The energy required to process 1000kg of yam into flour was estimated to be 6720.15MJ for the cooking method, 6934.48MJ for the steaming method, and 4296.56MJ for the wet-milling method. The wet-milling method had the lowest energy intensity at 4.3MJ/kg. Drying consumed the largest portion of energy for each method, ranging from 66.26% to 79.04% of total energy. The wet-
This document is a thesis submitted by Shourjomay Chattopadhyay to the Department of Natural Resources at TERI University in partial fulfillment of a Master's degree in Environmental Studies and Resource Management. The thesis assesses industrial symbiosis in Muzaffarnagar, India through material flow analysis and identification of existing and potential waste exchange networks between industries. Key industries studied include brick, paper, steel and sugar. The thesis documents existing waste flows, proposes additional symbiotic links, and models impacts on waste disposal and the environment.
Energy and Exergy Analysis of ETC Based Solar Air DryerIRJAES Editor
This document summarizes a study on the energy and exergy analysis of a solar air dryer using an evacuated tube collector (ETC). The study found that the first law efficiency (based on energy) of the solar air dryer is higher than the second law efficiency (based on exergy), and both efficiencies increase with higher airflow rates. The efficiencies also fluctuate during the day based on changing solar radiation levels. The document provides background on solar drying technologies, solar radiation measurement, and details of the experimental setup using a 9-tube ETC collector for the study.
The document reviews different solar drying techniques, specifically open sun drying, direct drying, and indirect drying using solar greenhouse dryers. Open sun drying is the oldest and simplest method but has disadvantages like exposure to weather, pests, and foreign materials. Greenhouse dryers allow for indirect or direct drying and offer protection while improving product quality and production rates over open sun drying. Photovoltaic-integrated greenhouse dryers provide the highest rates of production. In general, solar drying preserves agricultural products, reduces losses, and lowers costs compared to mechanical drying methods.
The Application of Solar Energy in Agricultural Systemsijtsrd
Given that one day fossil fuels will end, a need arises to find alternative fuels. Renewable energy is considered an alternative to fossil fuels and nowadays it attracts much attention. Among renewable energy sources, solar is the most important because it is available in all parts of the world. Also, this energy source is used in various industries including agriculture and it can be used in cultivating crops in the farthest corners of the world. In addition, this fuel does not cause pollution, like the other fossil fuels. Using the solar energy can be active in all agricultural areas. That will definitely help meet the increasing need for agricultural products with the increasing population. However, it is known that the agricultural land has a fixed area and, sometimes, agricultural products cannot be cultivated. That greenhouse is a method that is used nowadays and using the solar energy can help build solar greenhouses in areas far away from the city. Other applications of solar energy include irrigation, drying products, and ventilation niches. In this study, the researchers discuss some of the benefits of solar energy in agriculture. P. Boopathi "The Application of Solar Energy in Agricultural Systems" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-1 , December 2018, URL: http://www.ijtsrd.com/papers/ijtsrd19019.pdf
http://www.ijtsrd.com/engineering/agricultural-engineering/19019/the-application-of-solar-energy-in-agricultural-systems/p-boopathi
Seminar on performance evaluation of a solar tunnelIman Ghosh
The document summarizes a study evaluating the performance of a solar tunnel dryer for drying fruits and vegetables throughout the year. Key findings from the study include:
- Products dried in the solar tunnel dryer for 7-8 days were of good quality and sensory evaluation found them to be highly acceptable.
- The dryer was able to reduce the moisture content of garlic from 65% to 8.5%, chili from 77% to 7%, fenugreek from 86% to 7.2%, and aonla candy from 44% to 16% on average.
- The average thermal efficiency of the solar tunnel dryer ranged from 8.89% to 17.63% for different products dried.
This document discusses a proposed hybrid solar-electric dryer for municipal solid waste in India. It begins with background on the large quantities of municipal solid waste generated in India daily and the problems with current disposal methods. The composition and properties of municipal solid waste are described. It then provides an overview of solar drying technologies and discusses a proposed hybrid dryer that uses both solar heating and an electric heating coil. The dryer would consist of a box with a solar absorber plate and electric coil to dry waste. This could help address odor and health issues from wet waste while potentially providing fuel for boilers. In conclusion, no current system exists to dry municipal solid waste, which this hybrid approach aims to solve.
Design, fabrication and heat transfer study of green house dryer 2IAEME Publication
This document summarizes a study that designed, fabricated, and tested a greenhouse dryer to dry crops using solar energy. Experiments were conducted to dry bitter melon using both open-air drying and greenhouse drying. Measurements of solar intensity, humidity, temperature, air velocity, and moisture removal rate were recorded over time. The data was used to determine the convective heat transfer coefficient for both drying methods. It was found that the convective heat transfer coefficient was lower for greenhouse drying than open-air drying, especially at the beginning of the drying process. However, greenhouse drying helps prevent moisture loss and allows crops to be dried year-round.
A comparative study of energy demand of instant pounded yam flour production...Alexander Decker
This study analyzed the energy demand of three methods for producing instant-pounded yam flour: the cooking method, steaming method, and wet-milling method. Data was collected from nine instant-pounded yam flour factories. The energy required to process 1000kg of yam into flour was estimated to be 6720.15MJ for the cooking method, 6934.48MJ for the steaming method, and 4296.56MJ for the wet-milling method. The wet-milling method had the lowest energy intensity at 4.3MJ/kg. Drying consumed the largest portion of energy for each method, ranging from 66.26% to 79.04% of total energy. The wet-
This document is a thesis submitted by Shourjomay Chattopadhyay to the Department of Natural Resources at TERI University in partial fulfillment of a Master's degree in Environmental Studies and Resource Management. The thesis assesses industrial symbiosis in Muzaffarnagar, India through material flow analysis and identification of existing and potential waste exchange networks between industries. Key industries studied include brick, paper, steel and sugar. The thesis documents existing waste flows, proposes additional symbiotic links, and models impacts on waste disposal and the environment.
IOSR Journal of Humanities and Social Science is an International Journal edited by International Organization of Scientific Research (IOSR).The Journal provides a common forum where all aspects of humanities and social sciences are presented. IOSR-JHSS publishes original papers, review papers, conceptual framework, analytical and simulation models, case studies, empirical research, technical notes etc.
Smart Traction on Solar Powered Space RoversIOSR Journals
This document summarizes a research paper on developing a solar-powered space rover with improved traction and obstacle avoidance capabilities. The proposed rover uses infrared sensors to detect obstacles and a microcontroller to manipulate the rover's direction. It also features a solar tracking mechanism to increase power generation and a battery system for energy storage. Simulation results show the rover is able to efficiently detect and avoid obstacles while mapping its environment and navigating to targets using only solar power.
A Hybrid Technique for Shape Matching Based on chain code and DFS TreeIOSR Journals
This document proposes a hybrid technique for shape matching that combines chain code and depth-first search (DFS) tree methods. Chain code is used to detect boundaries and represent shapes, but can result in long codes that reduce accuracy. DFS is applied to break long chain codes into smaller subgraphs, producing more compact patterns that improve matching performance. The technique is tested on 500 images from different categories, achieving higher precision and recall than chain code alone, demonstrating the effectiveness of the hybrid approach.
Image Processing for Automated Flaw Detection and CMYK model for Color Image ...IOSR Journals
This document discusses several image processing techniques for automated flaw detection in infrared thermography data, including thermal contrast computation, pulsed phase thermography, thermographic signal reconstruction, and principal component analysis. It also discusses using type-2 fuzzy logic to model uncertainties in image segmentation and classification by representing membership functions as three-dimensional rather than two-dimensional. The goal is to develop robust and automated techniques for flaw detection and sizing in carbon fiber composite materials using infrared thermography.
Massive Regional Texture Extraction for Aerial and Natural ImagesIOSR Journals
The document presents a proposed method called Massive Regional Texture Extraction (MRTE) for segmenting natural and aerial images. The MRTE method uses local thresholding and seeded region growing to extract textured regions from images. It maintains a lookup table to control pixel homogeneity during region growth. The algorithm provides less user interaction while achieving sharp demarcation of edges and intensity levels. Experimental results on natural and aerial image datasets show MRTE increases segmented homogeneous regions by 40-50% and pixels in segmented images by 50-60% compared to existing seeded growing methods. The proposed method effectively segments images into precise homogeneous regions for applications like content-based image retrieval.
Web-Based System for Software Requirements Quality Analysis Using Case-Based ...IOSR Journals
This document proposes a web-based system to analyze the quality of software requirements specifications (SRS) using case-based reasoning (CBR) and artificial neural networks (ANN). CBR solves new problems by comparing them to past, stored cases, but this can be inefficient when the case base is large. The proposed system improves the retrieval phase of CBR by using ANN to more efficiently measure the similarity between a new case and existing cases. This results in a web-based system that allows users to input SRS quality attributes and indicators, analyzes the SRS using CBR integrated with ANN, and presents a quality analysis report. The system is intended to help software developers better understand SRS quality and requirements.
Pillows and chairs can be used for both relaxation and exercise or play. Pillows are commonly used for sleeping or leaning but can also be used for pillow fights with friends. Chairs can be sat on but also used for balancing exercises by dancing on them or testing their quality, and chairs and pillows arranged together can make a cute scene.
This document discusses various image compression methods and algorithms. It begins by explaining the need for image compression in applications like transmission, storage, and databases. It then reviews different types of compression, including lossless techniques like run length encoding and Huffman encoding, and lossy techniques like transformation coding, vector quantization, fractal coding, and subband coding. The document also describes the JPEG 2000 image compression algorithm and applications of JPEG 2000. Finally, it discusses self-organizing feature maps (SOM) and learning vector quantization (VQ) for image compression.
Hardware Implementation of Low Cost Inertial Navigation System Using Mems Ine...IOSR Journals
This document describes the hardware implementation of a low-cost inertial navigation system using MEMS sensors. It discusses:
1) Calibrating the tri-axial accelerometer using a multi-position test to determine nine calibration parameters (scale factors, biases, misalignments) with equations, reducing the number of positions needed from twelve to six.
2) Similarly calibrating the tri-axial gyroscope using rate tests at different rotation speeds.
3) Developing error models for the accelerometer and gyroscope based on the calibrated parameters to remove sensor errors and noise.
4) Implementing the calibration algorithms and navigation equations in a microcontroller to track objects in real-time using the sensor data.
This document discusses secure web application development and preventing common vulnerabilities. It begins with an introduction on why web applications are often vulnerable and the importance of secure development. It then provides details on secure development lifecycles and practices, describes top vulnerabilities like injection flaws and cross-site scripting, and provides guidance on how to prevent each vulnerability through practices like input validation, output encoding, and access controls. The goal is to help developers understand security risks and how to build more robust applications through secure coding and threat modeling.
Analysis of Pseudogap in SuperconductorsIOSR Journals
The document analyzes the effect of the pseudogap on the static magnetic susceptibility of the high-temperature superconductor YBa2Cu3O7-δ. Magnetic susceptibility measurements were taken for various levels of oxygen deficiency δ, corresponding to different hole concentrations p. The data shows anomalous suppression of magnetic susceptibility above the critical temperature Tc in the underdoped region, indicative of the presence of a pseudogap. Analysis of the temperature and doping dependence of the magnetic susceptibility provides information about the pseudogap energy scale and its variation with hole concentration p.
IOSR Journal of Applied Chemistry (IOSR-JAC) is an open access international journal that provides rapid publication (within a month) of articles in all areas of applied chemistry and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in Chemical Science. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
The document provides an overview of an e-commerce and digital marketing platform that connects e-commerce and digital marketing capabilities. The platform allows users to rapidly launch digital marketing campaigns, personalize campaigns by market and channel, and automatically optimize content performance. It also enables management of global e-commerce operations across markets and channels with features like reusable catalogs and templates. The platform aims to provide tools to engage customers, optimize business operations, and deliver personalized customer experiences across channels.
Development and Validation of prediction for estimating resting energy expend...IOSR Journals
This document describes a study conducted to develop prediction equations for estimating resting energy expenditure (REE) in Indian subjects. Researchers measured body composition parameters of 100 Indian subjects using bioelectrical impedance analysis at frequencies of 5 kHz, 50 kHz, 100 kHz, and 200 kHz. Multiple regression analysis was used to develop two sets of REE prediction equations: 1) equations estimating REE at each frequency based on sex, age, weight, and impedance index, and 2) an equation estimating overall REE based on sex, age, fat-free mass, and fat mass. The predicted REE values from the equations closely matched measured REE values from the instrument, validating the developed prediction equations as the first such equations for Indian subjects
Oxford is home to many historic colleges and buildings, including Christ Church which features Tom Tower and Peckwater Quad, as well as the Bodleian Library, New College, Magdalen College with its cloister and hall, and Keble College chapel.
What have your learned from your audience feedbackkkkkkkTemibaybee
The document summarizes feedback received from peers on a horror trailer and accompanying poster and magazine. For the trailer, feedback praised the lighting, transitions, and camera movements but noted that the acting and pacing could be improved. Feedback on the poster liked the dark colors but said the model's expression could be more exaggerated. Feedback on the magazine said the typography did not match the poster or trailer and the white font clashed with the background color. Overall the feedback was mostly positive but identified some inconsistencies to address for future projects.
This document summarizes a study on the profitability and production efficiency of small-scale maize production in Niger State, Nigeria. The study found that maize production was profitable, with an average net farm income of 48,109 Naira per hectare. Production costs were 77.9% of total costs, with labor as the largest cost. The production efficiency index of 2.50 indicated that returns exceeded costs by 150%, showing profitability. While profitable, the study recommended increasing farm size and production to enhance profits further. Improving access to farmland, education, credit, and extension services were also suggested to improve profitability of small-scale maize production in the area.
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
Design and Experimentation of Collector based Solar Dryer with Recirculation ...IJERA Editor
Sun drying system is very common method of preserving agricultural product. Solar energy is used for heating
of air and to dry food substance. In open sun drying food is unprotected from rain, wind-borne dirt and dust,
infestation by insects, rodents and other animal. This process is practically attractive and environmentally sound.
Shell life of agricultural product is improve by drying. This paper present design and construction of active solar
dryer with recirculation technique. It consists of solar collector, drying chamber with netted trays and
recirculation arrangement. Air is allowed through inlet and it is heated up in collector. Then it is circulated in
drying chamber where it is utilize for drying. The design based on geographical location Wardha and
meteorological data were obtained for proper design specification. Locally available materials were used for
construction such as polyurethane glass, mild steel metal sheet, plywood sheet and insulating material.
IOSR Journal of Humanities and Social Science is an International Journal edited by International Organization of Scientific Research (IOSR).The Journal provides a common forum where all aspects of humanities and social sciences are presented. IOSR-JHSS publishes original papers, review papers, conceptual framework, analytical and simulation models, case studies, empirical research, technical notes etc.
Smart Traction on Solar Powered Space RoversIOSR Journals
This document summarizes a research paper on developing a solar-powered space rover with improved traction and obstacle avoidance capabilities. The proposed rover uses infrared sensors to detect obstacles and a microcontroller to manipulate the rover's direction. It also features a solar tracking mechanism to increase power generation and a battery system for energy storage. Simulation results show the rover is able to efficiently detect and avoid obstacles while mapping its environment and navigating to targets using only solar power.
A Hybrid Technique for Shape Matching Based on chain code and DFS TreeIOSR Journals
This document proposes a hybrid technique for shape matching that combines chain code and depth-first search (DFS) tree methods. Chain code is used to detect boundaries and represent shapes, but can result in long codes that reduce accuracy. DFS is applied to break long chain codes into smaller subgraphs, producing more compact patterns that improve matching performance. The technique is tested on 500 images from different categories, achieving higher precision and recall than chain code alone, demonstrating the effectiveness of the hybrid approach.
Image Processing for Automated Flaw Detection and CMYK model for Color Image ...IOSR Journals
This document discusses several image processing techniques for automated flaw detection in infrared thermography data, including thermal contrast computation, pulsed phase thermography, thermographic signal reconstruction, and principal component analysis. It also discusses using type-2 fuzzy logic to model uncertainties in image segmentation and classification by representing membership functions as three-dimensional rather than two-dimensional. The goal is to develop robust and automated techniques for flaw detection and sizing in carbon fiber composite materials using infrared thermography.
Massive Regional Texture Extraction for Aerial and Natural ImagesIOSR Journals
The document presents a proposed method called Massive Regional Texture Extraction (MRTE) for segmenting natural and aerial images. The MRTE method uses local thresholding and seeded region growing to extract textured regions from images. It maintains a lookup table to control pixel homogeneity during region growth. The algorithm provides less user interaction while achieving sharp demarcation of edges and intensity levels. Experimental results on natural and aerial image datasets show MRTE increases segmented homogeneous regions by 40-50% and pixels in segmented images by 50-60% compared to existing seeded growing methods. The proposed method effectively segments images into precise homogeneous regions for applications like content-based image retrieval.
Web-Based System for Software Requirements Quality Analysis Using Case-Based ...IOSR Journals
This document proposes a web-based system to analyze the quality of software requirements specifications (SRS) using case-based reasoning (CBR) and artificial neural networks (ANN). CBR solves new problems by comparing them to past, stored cases, but this can be inefficient when the case base is large. The proposed system improves the retrieval phase of CBR by using ANN to more efficiently measure the similarity between a new case and existing cases. This results in a web-based system that allows users to input SRS quality attributes and indicators, analyzes the SRS using CBR integrated with ANN, and presents a quality analysis report. The system is intended to help software developers better understand SRS quality and requirements.
Pillows and chairs can be used for both relaxation and exercise or play. Pillows are commonly used for sleeping or leaning but can also be used for pillow fights with friends. Chairs can be sat on but also used for balancing exercises by dancing on them or testing their quality, and chairs and pillows arranged together can make a cute scene.
This document discusses various image compression methods and algorithms. It begins by explaining the need for image compression in applications like transmission, storage, and databases. It then reviews different types of compression, including lossless techniques like run length encoding and Huffman encoding, and lossy techniques like transformation coding, vector quantization, fractal coding, and subband coding. The document also describes the JPEG 2000 image compression algorithm and applications of JPEG 2000. Finally, it discusses self-organizing feature maps (SOM) and learning vector quantization (VQ) for image compression.
Hardware Implementation of Low Cost Inertial Navigation System Using Mems Ine...IOSR Journals
This document describes the hardware implementation of a low-cost inertial navigation system using MEMS sensors. It discusses:
1) Calibrating the tri-axial accelerometer using a multi-position test to determine nine calibration parameters (scale factors, biases, misalignments) with equations, reducing the number of positions needed from twelve to six.
2) Similarly calibrating the tri-axial gyroscope using rate tests at different rotation speeds.
3) Developing error models for the accelerometer and gyroscope based on the calibrated parameters to remove sensor errors and noise.
4) Implementing the calibration algorithms and navigation equations in a microcontroller to track objects in real-time using the sensor data.
This document discusses secure web application development and preventing common vulnerabilities. It begins with an introduction on why web applications are often vulnerable and the importance of secure development. It then provides details on secure development lifecycles and practices, describes top vulnerabilities like injection flaws and cross-site scripting, and provides guidance on how to prevent each vulnerability through practices like input validation, output encoding, and access controls. The goal is to help developers understand security risks and how to build more robust applications through secure coding and threat modeling.
Analysis of Pseudogap in SuperconductorsIOSR Journals
The document analyzes the effect of the pseudogap on the static magnetic susceptibility of the high-temperature superconductor YBa2Cu3O7-δ. Magnetic susceptibility measurements were taken for various levels of oxygen deficiency δ, corresponding to different hole concentrations p. The data shows anomalous suppression of magnetic susceptibility above the critical temperature Tc in the underdoped region, indicative of the presence of a pseudogap. Analysis of the temperature and doping dependence of the magnetic susceptibility provides information about the pseudogap energy scale and its variation with hole concentration p.
IOSR Journal of Applied Chemistry (IOSR-JAC) is an open access international journal that provides rapid publication (within a month) of articles in all areas of applied chemistry and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in Chemical Science. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
The document provides an overview of an e-commerce and digital marketing platform that connects e-commerce and digital marketing capabilities. The platform allows users to rapidly launch digital marketing campaigns, personalize campaigns by market and channel, and automatically optimize content performance. It also enables management of global e-commerce operations across markets and channels with features like reusable catalogs and templates. The platform aims to provide tools to engage customers, optimize business operations, and deliver personalized customer experiences across channels.
Development and Validation of prediction for estimating resting energy expend...IOSR Journals
This document describes a study conducted to develop prediction equations for estimating resting energy expenditure (REE) in Indian subjects. Researchers measured body composition parameters of 100 Indian subjects using bioelectrical impedance analysis at frequencies of 5 kHz, 50 kHz, 100 kHz, and 200 kHz. Multiple regression analysis was used to develop two sets of REE prediction equations: 1) equations estimating REE at each frequency based on sex, age, weight, and impedance index, and 2) an equation estimating overall REE based on sex, age, fat-free mass, and fat mass. The predicted REE values from the equations closely matched measured REE values from the instrument, validating the developed prediction equations as the first such equations for Indian subjects
Oxford is home to many historic colleges and buildings, including Christ Church which features Tom Tower and Peckwater Quad, as well as the Bodleian Library, New College, Magdalen College with its cloister and hall, and Keble College chapel.
What have your learned from your audience feedbackkkkkkkTemibaybee
The document summarizes feedback received from peers on a horror trailer and accompanying poster and magazine. For the trailer, feedback praised the lighting, transitions, and camera movements but noted that the acting and pacing could be improved. Feedback on the poster liked the dark colors but said the model's expression could be more exaggerated. Feedback on the magazine said the typography did not match the poster or trailer and the white font clashed with the background color. Overall the feedback was mostly positive but identified some inconsistencies to address for future projects.
This document summarizes a study on the profitability and production efficiency of small-scale maize production in Niger State, Nigeria. The study found that maize production was profitable, with an average net farm income of 48,109 Naira per hectare. Production costs were 77.9% of total costs, with labor as the largest cost. The production efficiency index of 2.50 indicated that returns exceeded costs by 150%, showing profitability. While profitable, the study recommended increasing farm size and production to enhance profits further. Improving access to farmland, education, credit, and extension services were also suggested to improve profitability of small-scale maize production in the area.
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology.
Design and Experimentation of Collector based Solar Dryer with Recirculation ...IJERA Editor
Sun drying system is very common method of preserving agricultural product. Solar energy is used for heating
of air and to dry food substance. In open sun drying food is unprotected from rain, wind-borne dirt and dust,
infestation by insects, rodents and other animal. This process is practically attractive and environmentally sound.
Shell life of agricultural product is improve by drying. This paper present design and construction of active solar
dryer with recirculation technique. It consists of solar collector, drying chamber with netted trays and
recirculation arrangement. Air is allowed through inlet and it is heated up in collector. Then it is circulated in
drying chamber where it is utilize for drying. The design based on geographical location Wardha and
meteorological data were obtained for proper design specification. Locally available materials were used for
construction such as polyurethane glass, mild steel metal sheet, plywood sheet and insulating material.
Optimization of Solar Drying of Blanched and Unblanched Aerial Yam using Resp...ijtsrd
This paper focuses on the application of response surface methodology RSM for the modelling and optimization of unblanched and blanched aerial yam drying using solar dryer. Mass in gram of the sample, slice thickness of the sample, and the airspeed of dryer are the independent variables considered, while the response of interest is the moisture content. RSM via central composite design CCD was used to optimize the variables of interest, while artificial neural network was used to validate the result. The result showed that a second order polynomial regression model could convincingly interpret the drying process of the aerial yam. A coefficient of determination R2 value of 0.9991 and 0.9828, model F value of 1186.03 and 60.75 for unblanched and blanched aerial yam respectively were obtained. P value 0.0001 , and low value of coefficient of variation 2.43 and 9.75 for unblanched and blanched sample indicated the fitness of the model. The optimum process variable obtained were 71 g, 3.2 mm and 1.5 m s, and 70 g, 3.0 mm and 1.5 m s for blanched and unblanched sample, respectively. Emmanuel C. Nwadike. | Matthew N. Abonyi. | Joseph T. Nwabanne. | Pascal E. Ohale "Optimization of Solar Drying of Blanched and Unblanched Aerial Yam using Response Surface Methodology" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-3 , April 2020, URL: https://www.ijtsrd.com/papers/ijtsrd30598.pdf Paper Url :https://www.ijtsrd.com/engineering/mechanical-engineering/30598/optimization-of-solar-drying-of-blanched-and-unblanched-aerial-yam-using-response-surface-methodology/emmanuel-c-nwadike
This document describes the design and testing of a solar-powered pepper dryer. The dryer uses natural convection of heated air to dry 50kg of fresh pepper over 3 days, reducing the moisture content by 83% on average. It has two chambers - an air heater and a storage bin connected by an opening. Temperature readings during testing showed higher differences early in drying that decreased over time as moisture in the air reduced. The dryer effectively dried pepper in a more hygienic way than traditional open-air methods.
Design of solar drier for rice at karjat, raigad, maharashtraSumit Dharmarao
This paper deals with current practices of drying
agricultural products in most of developing nations
like India. It also try to coin the concept of utilization
of Solar dryer at farm side. In a developing country like
India, having the second largest population and
agriculture as the source of income to nearly 60 % of
the total population, post-harvest and storage loss is a
major quandary, which needs to be addressed in due
diligence. Many food preservation techniques like cold
storage, drying, etc., have been evolved out over the
years to tackle the above losses. The major constraint
is that almost all the technologies are utilizing fossil
fuel resources, which are depleting very fast and wise
use of these precious resources are preferred for longterm
energy sustainability. Therefore, sustainable
methods for food preservation are the need of the
hour. Solar drying is one of the best choices in this
context. The effect of temperature to moisture
contents against time and rate of drying are studied &
discussed in this paper.
This document outlines the design of a solar crop dryer. It includes sections on introduction and objectives, which aim to design a cost-effective solar dryer. It also discusses methodology, including determining solar energy absorption by flat plate collectors and the drying chamber design. Key specifications calculated are the declination angle, solar intensities, and energy absorbed by the collector, which is estimated at 14.77% efficiency. The solar dryer aims to provide a more sustainable alternative to open air drying and protect crops from spoilage.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Performance Analysis of Forced Convection Solar Dryer for TurmericIRJET Journal
This document describes the design, development, and performance analysis of a forced convection solar dryer for drying turmeric. Key points:
1) A forced convection solar dryer was designed and built consisting of a solar collector, blower, drying chamber, and supporting frame. Experiments were conducted drying turmeric using this solar dryer.
2) Results showed that turmeric could be dried from an initial 85.33% moisture content to a final 10.76% moisture content within 48 hours of sunshine using the solar dryer, much faster than open-air drying.
3) Drying time, solar intensity, moisture loss, and dryer efficiency were evaluated under different experimental conditions. The solar
Performance Evaluation of a Developed Multipurpose Solar Dryerijtsrd
Post harvest losses in developing countries have contributed to the unavailability of foodstuff. Estimation of these losses is generally cited to be of the order of 4 but under very adverse conditions, it is estimated as high as 100 . A significant percentage of these losses are related to improper and or untimely preservation of foodstuffs. This research work is therefore aimed at developing a multipurpose solar dryer. The solar dryer consists mainly of solar collector and dryer chamber compartment. The materials used in this research work include based frame, transparent fiberglass cover, an absorber oven baked Aluminium , thermometer, wire gauze, etc. The frame was constructed from a wood bars with a dimension of 900 mm x 900 mm x 600 mm. The dryer chamber is a truncated rectangle and it comprises of a double walls made up of a plain ply board measuring 800 mm x 800 mm x by 500 mm with a transparent fiberglass cover inclined at an angle of 15o. Three different samples namely sample A sliced plantains , sample B sliced yams , and sample C fish were used for test performance evaluation of the developed multipurpose solar dryer. The results obtained reveal that overall heat energy transfer coefficient of 4.91w m0C, dryer chamber rate of 0.654 kg hr., and dryer chamber area of 0.659 m2 were required by the solar dryer. Besides, the solar dryer dried the three samples used in this research work within duration of 8 hours i.e., 9am 5pm . The maximum solar chamber dryer temperature and ambient temperature were recorded as 55.00 oC and 35.46 oC respectively. Besides, the minimum lower temperature values recorded were obtained as 40.45 oC for solar chamber dryer temperature and 29.02 oC for ambient temperature. The improved results obtained with the multipurpose solar dryer were due to improved temperature obtained with the solar dryer chamber. Orhorhoro EK | Aregbe O | Tamuno RI "Performance Evaluation of a Developed Multipurpose Solar Dryer" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-4 , June 2020, URL: https://www.ijtsrd.com/papers/ijtsrd31195.pdf Paper Url :https://www.ijtsrd.com/engineering/mechanical-engineering/31195/performance-evaluation-of-a-developed-multipurpose-solar-dryer/orhorhoro-ek
A review-on-solar-drying-of-agricultural-produce-Paulo Peixinho
This document provides a review of solar drying of agricultural produce. It discusses:
- The limitations of traditional sun drying methods and how solar drying systems offer improvements by drying products in an enclosed system where the inside temperature is higher.
- Different types of solar dryers, including tent dryers, box dryers, and natural circulation dryers, as well as classifications based on air movement and solar insulation exposure.
- Key considerations in solar dryer design like air collectors and the advantages solar drying provides over traditional methods like higher rates of drying and protection from insects and animals.
Comparative Study of Experimental Investigation and Theoretical Verification ...IRJET Journal
This document summarizes a study that modified a solar dryer design to more effectively dry mango pulp. The authors presented a solar dryer design with a spiral convection tube to improve heating rates. This design inducts radiation from the sun and emits radiant energy from within to increase heating by 22-27%. The study investigated the modified dryer experimentally and theoretically. Key parameters like temperature, efficiency, air flow, and materials were considered in the design and testing of the solar dryer for drying mango pulp.
AN APPLICATION OF SOLAR DRYER IN ORDER TO REMOVE MOISTURE AND DIFFERENCIATING...Anugrah Soy
Due to the current trends towards higher cost of fossil fuels and uncertainty regarding future cost
and availability, use of solar energy in food processing will probably increase and become more
economically feasible in the near future.The solar dryer is one of them which help to preserve our food and many eatable things like vegetable fruits and many more things . In this experiment we find that how much moisture removed from the sample which is present in solar dryer and the sample which is present in ordinary air and we compare both of them by mathematical calculation. In this paper we took green chili, some of the chili we put inside the dryer and some in the ordinary air and then compare their moisture removed with respect to time and temperature.
In many countries,agricultural products are dried under the open sun. However,this way of drying deg rades the quality of the dried products due to interferen ce from external impurities and uneven drying rates . Numerous types of solar dryers have been designed a nd developed in various parts of the world,yieldin g varying degrees of technical performance. Basically,there are three types of solar dryers;direct sol ar dryers,indirect solar dryers and mixed-mode dryers. This r eview paper is focused on hybrid solar dryers. Drying proceeded successfully even under unfavorable weath er conditions in the hybrid mode of operation these are the most cost effective type of dryers and are easy to fabricate and use. In this review paper,we reviewe d different types of hybrid solar dryers and different design m odifications applied to them in order to increase t heir effectiveness.
IRJET- Design & Construction of Solar Dryer for Mango SlicesIRJET Journal
The document describes the design and construction of a solar cabinet dryer for drying mango slices in India. Key features of the dryer include a tilted glass top at a 37 degree angle, adjustable air vents for airflow control, and four movable mesh trays inside the drying chamber. Design calculations were performed to determine the required drying time, energy needs, and dryer size based on initial mango moisture content of 85% down to a final storage content of 6%. A prototype dryer was successfully constructed locally and tested for drying 1 kg of mango slices within 10 hours.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Design, Fabrication and Performance Evaluation of an Indirect Solar Dryer for...IRJET Journal
This document describes the design, fabrication, and performance evaluation of an indirect solar dryer for drying agricultural products. The dryer consists of a solar air collector to heat air, a drying cabinet, and a centrifugal blower. The collector uses baffles to increase the heating time of air as it passes through. Heated air is blown into the drying chamber where agricultural products like apple slices are dried. The dryer was tested and found to be effective at drying products using solar energy in a sustainable way without fossil fuels.
Drying characteristics of a hygroscopic material in a fabricated naturalIAEME Publication
This document summarizes a study on drying characteristics of banana in a solar cabinet drier. The study involved fabricating a natural convective solar cabinet drier consisting of a flat plate collector and drying cabinet. Experiments were conducted drying banana in thin layers over 3 consecutive days. Temperature, humidity, and moisture content were recorded. Results showed the maximum drying air temperature was 69.5°C, drying banana from 93.5% to 7.13% moisture content over 2 days. The solar cabinet drier was found to be 60% more efficient than traditional sun drying and effectively dried banana for local farmers with a low-cost design.
Numerical Simulation of Solar Greenhouse Dryer Using Computational Fluid Dyna...RSIS International
Moisture removal from crops and other food items is
one of the ways to preserve them for longer duration. Previously,
drying openly in sun was used to reduce moisture content. But it
had some disadvantages like contamination due to dirt and other
unwanted elements as well as attack by rodents and birds.
Drying in covered close space with vents would be helpful in
overcoming these problems. Solar greenhouse dryers are the
close conduits in which crops can be dried without negatively
affecting the nutrition value. The factors affecting the crop
drying are solar radiation, climatic conditions, material of which
the dryer is made of and shape of the dryer. A lot of
experimental investigations have been done to improve the
drying rate. With the advances in computational power and
numerical techniques, Computational Fluid Dynamics (CFD) has
emerged as a powerful tool to optimize any design. In the present
study, simulations have been done on greenhouse dryer with
modifications to identify the temperature distribution with
variation in wind velocity. Different radiation levels have also
been found out at different locations in the dryer. The model of
the dryer has been created in CREO 5.0 and analysis has been
performed using ANSYS 14.0. The simulation has been done for
both forced and natural convection. Obtained results have been
validated with the experimental work done by previous works.
Better drying rate has been obtained for forced circulation as
compared to natural convection which is in agreement with the
available experimental results.
A solar dryer is an application of solar energy, used immensely in the food and agriculture industry. Though the sun is still used as the direct source for drying food items and clothes in certain parts of the world. An indirect source of solar power can also be used for the same purpose in the form of a solar dryer.
The document describes a study on improving the thermal efficiency of a solar tunnel drier. A working model of a solar tunnel drier was constructed using a single layer of polyethylene sheeting. Experiments were conducted to measure the temperature increase inside the drier compared to ambient temperature. Additional experiments used double layers of polyethylene sheeting with air gaps of 50mm and 100mm between the layers. The purpose was to determine if the additional insulation of an air gap improved the thermal efficiency of the drier. Temperature, humidity and solar intensity readings were taken over an 8 hour period and compared between the single layer and double layer configurations.
This document provides a technical review of secure banking using RSA and AES encryption methodologies. It discusses how RSA and AES are commonly used encryption standards for secure data transmission between ATMs and bank servers. The document first provides background on ATM security measures and risks of attacks. It then reviews related work analyzing encryption techniques. The document proposes using a one-time password in addition to a PIN for ATM authentication. It concludes that implementing encryption standards like RSA and AES can make transactions more secure and build trust in online banking.
This document analyzes the performance of various modulation schemes for achieving energy efficient communication over fading channels in wireless sensor networks. It finds that for long transmission distances, low-order modulations like BPSK are optimal due to their lower SNR requirements. However, as transmission distance decreases, higher-order modulations like 16-QAM and 64-QAM become more optimal since they can transmit more bits per symbol, outweighing their higher SNR needs. Simulations show lifetime extensions up to 550% are possible in short-range networks by using higher-order modulations instead of just BPSK. The optimal modulation depends on transmission distance and balancing the energy used by electronic components versus power amplifiers.
This document provides a review of mobility management techniques in vehicular ad hoc networks (VANETs). It discusses three modes of communication in VANETs: vehicle-to-infrastructure (V2I), vehicle-to-vehicle (V2V), and hybrid vehicle (HV) communication. For each communication mode, different mobility management schemes are required due to their unique characteristics. The document also discusses mobility management challenges in VANETs and outlines some open research issues in improving mobility management for seamless communication in these dynamic networks.
This document provides a review of different techniques for segmenting brain MRI images to detect tumors. It compares the K-means and Fuzzy C-means clustering algorithms. K-means is an exclusive clustering algorithm that groups data points into distinct clusters, while Fuzzy C-means is an overlapping clustering algorithm that allows data points to belong to multiple clusters. The document finds that Fuzzy C-means requires more time for brain tumor detection compared to other methods like hierarchical clustering or K-means. It also reviews related work applying these clustering algorithms to segment brain MRI images.
1) The document simulates and compares the performance of AODV and DSDV routing protocols in a mobile ad hoc network under three conditions: when users are fixed, when users move towards the base station, and when users move away from the base station.
2) The results show that both protocols have higher packet delivery and lower packet loss when users are either fixed or moving towards the base station, since signal strength is better in those scenarios. Performance degrades when users move away from the base station due to weaker signals.
3) AODV generally has better performance than DSDV, with higher throughput and packet delivery rates observed across the different user mobility conditions.
This document describes the design and implementation of 4-bit QPSK and 256-bit QAM modulation techniques using MATLAB. It compares the two techniques based on SNR, BER, and efficiency. The key steps of implementing each technique in MATLAB are outlined, including generating random bits, modulation, adding noise, and measuring BER. Simulation results show scatter plots and eye diagrams of the modulated signals. A table compares the results, showing that 256-bit QAM provides better performance than 4-bit QPSK. The document concludes that QAM modulation is more effective for digital transmission systems.
The document proposes a hybrid technique using Anisotropic Scale Invariant Feature Transform (A-SIFT) and Robust Ensemble Support Vector Machine (RESVM) to accurately identify faces in images. A-SIFT improves upon traditional SIFT by applying anisotropic scaling to extract richer directional keypoints. Keypoints are processed with RESVM and hypothesis testing to increase accuracy above 95% by repeatedly reprocessing images until the threshold is met. The technique was tested on similar and different facial images and achieved better results than SIFT in retrieval time and reduced keypoints.
This document studies the effects of dielectric superstrate thickness on microstrip patch antenna parameters. Three types of probes-fed patch antennas (rectangular, circular, and square) were designed to operate at 2.4 GHz using Arlondiclad 880 substrate. The antennas were tested with and without an Arlondiclad 880 superstrate of varying thicknesses. It was found that adding a superstrate slightly degraded performance by lowering the resonant frequency and increasing return loss and VSWR, while decreasing bandwidth and gain. Specifically, increasing the superstrate thickness or dielectric constant resulted in greater changes to the antenna parameters.
This document describes a wireless environment monitoring system that utilizes soil energy as a sustainable power source for wireless sensors. The system uses a microbial fuel cell to generate electricity from the microbial activity in soil. Two microbial fuel cells were created using different soil types and various additives to produce different current and voltage outputs. An electronic circuit was designed on a printed circuit board with components like a microcontroller and ZigBee transceiver. Sensors for temperature and humidity were connected to the circuit to monitor the environment wirelessly. The system provides a low-cost way to power remote sensors without needing battery replacement and avoids the high costs of wiring a power source.
1) The document proposes a model for a frequency tunable inverted-F antenna that uses ferrite material.
2) The resonant frequency of the antenna can be significantly shifted from 2.41GHz to 3.15GHz, a 31% shift, by increasing the static magnetic field placed on the ferrite material.
3) Altering the permeability of the ferrite allows tuning of the antenna's resonant frequency without changing the physical dimensions, providing flexibility to operate over a wide frequency range.
This document summarizes a research paper that presents a speech enhancement method using stationary wavelet transform. The method first classifies speech into voiced, unvoiced, and silence regions based on short-time energy. It then applies different thresholding techniques to the wavelet coefficients of each region - modified hard thresholding for voiced speech, semi-soft thresholding for unvoiced speech, and setting coefficients to zero for silence. Experimental results using speech from the TIMIT database corrupted with white Gaussian noise at various SNR levels show improved performance over other popular denoising methods.
This document reviews the design of an energy-optimized wireless sensor node that encrypts data for transmission. It discusses how sensing schemes that group nodes into clusters and transmit aggregated data can reduce energy consumption compared to individual node transmissions. The proposed node design calculates the minimum transmission power needed based on received signal strength and uses a periodic sleep/wake cycle to optimize energy when not sensing or transmitting. It aims to encrypt data at both the node and network level to further optimize energy usage for wireless communication.
This document discusses group consumption modes. It analyzes factors that impact group consumption, including external environmental factors like technological developments enabling new forms of online and offline interactions, as well as internal motivational factors at both the group and individual level. The document then proposes that group consumption modes can be divided into four types based on two dimensions: vertical (group relationship intensity) and horizontal (consumption action period). These four types are instrument-oriented, information-oriented, enjoyment-oriented, and relationship-oriented consumption modes. Finally, the document notes that consumption modes are dynamic and can evolve over time.
The document summarizes a study of different microstrip patch antenna configurations with slotted ground planes. Three antenna designs were proposed and their performance evaluated through simulation: a conventional square patch, an elliptical patch, and a star-shaped patch. All antennas were mounted on an FR4 substrate. The effects of adding different slot patterns to the ground plane on resonance frequency, bandwidth, gain and efficiency were analyzed parametrically. Key findings were that reshaping the patch and adding slots increased bandwidth and shifted resonance frequency. The elliptical and star patches in particular performed better than the conventional design. Three antenna configurations were selected for fabrication and measurement based on the simulations: a conventional patch with a slot under the patch, an elliptical patch with slots
1) The document describes a study conducted to improve call drop rates in a GSM network through RF optimization.
2) Drive testing was performed before and after optimization using TEMS software to record network parameters like RxLevel, RxQuality, and events.
3) Analysis found call drops were occurring due to issues like handover failures between sectors, interference from adjacent channels, and overshooting due to antenna tilt.
4) Corrective actions taken included defining neighbors between sectors, adjusting frequencies to reduce interference, and lowering the mechanical tilt of an antenna.
5) Post-optimization drive testing showed improvements in RxLevel, RxQuality, and a reduction in dropped calls.
This document describes the design of an intelligent autonomous wheeled robot that uses RF transmission for communication. The robot has two modes - automatic mode where it can make its own decisions, and user control mode where a user can control it remotely. It is designed using a microcontroller and can perform tasks like object recognition using computer vision and color detection in MATLAB, as well as wall painting using pneumatic systems. The robot's movement is controlled by DC motors and it uses sensors like ultrasonic sensors and gas sensors to navigate autonomously. RF transmission allows communication between the robot and a remote control unit. The overall aim is to develop a low-cost robotic system for industrial applications like material handling.
This document reviews cryptography techniques to secure the Ad-hoc On-Demand Distance Vector (AODV) routing protocol in mobile ad-hoc networks. It discusses various types of attacks on AODV like impersonation, denial of service, eavesdropping, black hole attacks, wormhole attacks, and Sybil attacks. It then proposes using the RC6 cryptography algorithm to secure AODV by encrypting data packets and detecting and removing malicious nodes launching black hole attacks. Simulation results show that after applying RC6, the packet delivery ratio and throughput of AODV increase while delay decreases, improving the security and performance of the network under attack.
The document describes a proposed modification to the conventional Booth multiplier that aims to increase its speed by applying concepts from Vedic mathematics. Specifically, it utilizes the Urdhva Tiryakbhyam formula to generate all partial products concurrently rather than sequentially. The proposed 8x8 bit multiplier was coded in VHDL, simulated, and found to have a path delay 44.35% lower than a conventional Booth multiplier, demonstrating its potential for higher speed.
This document discusses image deblurring techniques. It begins by introducing image restoration and focusing on image deblurring. It then discusses challenges with image deblurring being an ill-posed problem. It reviews existing approaches to screen image deconvolution including estimating point spread functions and iteratively estimating blur kernels and sharp images. The document also discusses handling spatially variant blur and summarizes the relationship between the proposed method and previous work for different blur types. It proposes using color filters in the aperture to exploit parallax cues for segmentation and blur estimation. Finally, it proposes moving the image sensor circularly during exposure to prevent high frequency attenuation from motion blur.
This document describes modeling an adaptive controller for an aircraft roll control system using PID, fuzzy-PID, and genetic algorithm. It begins by introducing the aircraft roll control system and motivation for developing an adaptive controller to minimize errors from noisy analog sensor signals. It then provides the mathematical model of aircraft roll dynamics and describes modeling the real-time flight control system in MATLAB/Simulink. The document evaluates PID, fuzzy-PID, and PID-GA (genetic algorithm) controllers for aircraft roll control and finds that the PID-GA controller delivers the best performance.
"What does it really mean for your system to be available, or how to define w...Fwdays
We will talk about system monitoring from a few different angles. We will start by covering the basics, then discuss SLOs, how to define them, and why understanding the business well is crucial for success in this exercise.
QR Secure: A Hybrid Approach Using Machine Learning and Security Validation F...AlexanderRichford
QR Secure: A Hybrid Approach Using Machine Learning and Security Validation Functions to Prevent Interaction with Malicious QR Codes.
Aim of the Study: The goal of this research was to develop a robust hybrid approach for identifying malicious and insecure URLs derived from QR codes, ensuring safe interactions.
This is achieved through:
Machine Learning Model: Predicts the likelihood of a URL being malicious.
Security Validation Functions: Ensures the derived URL has a valid certificate and proper URL format.
This innovative blend of technology aims to enhance cybersecurity measures and protect users from potential threats hidden within QR codes 🖥 🔒
This study was my first introduction to using ML which has shown me the immense potential of ML in creating more secure digital environments!
Must Know Postgres Extension for DBA and Developer during MigrationMydbops
Mydbops Opensource Database Meetup 16
Topic: Must-Know PostgreSQL Extensions for Developers and DBAs During Migration
Speaker: Deepak Mahto, Founder of DataCloudGaze Consulting
Date & Time: 8th June | 10 AM - 1 PM IST
Venue: Bangalore International Centre, Bangalore
Abstract: Discover how PostgreSQL extensions can be your secret weapon! This talk explores how key extensions enhance database capabilities and streamline the migration process for users moving from other relational databases like Oracle.
Key Takeaways:
* Learn about crucial extensions like oracle_fdw, pgtt, and pg_audit that ease migration complexities.
* Gain valuable strategies for implementing these extensions in PostgreSQL to achieve license freedom.
* Discover how these key extensions can empower both developers and DBAs during the migration process.
* Don't miss this chance to gain practical knowledge from an industry expert and stay updated on the latest open-source database trends.
Mydbops Managed Services specializes in taking the pain out of database management while optimizing performance. Since 2015, we have been providing top-notch support and assistance for the top three open-source databases: MySQL, MongoDB, and PostgreSQL.
Our team offers a wide range of services, including assistance, support, consulting, 24/7 operations, and expertise in all relevant technologies. We help organizations improve their database's performance, scalability, efficiency, and availability.
Contact us: info@mydbops.com
Visit: https://www.mydbops.com/
Follow us on LinkedIn: https://in.linkedin.com/company/mydbops
For more details and updates, please follow up the below links.
Meetup Page : https://www.meetup.com/mydbops-databa...
Twitter: https://twitter.com/mydbopsofficial
Blogs: https://www.mydbops.com/blog/
Facebook(Meta): https://www.facebook.com/mydbops/
GlobalLogic Java Community Webinar #18 “How to Improve Web Application Perfor...GlobalLogic Ukraine
Під час доповіді відповімо на питання, навіщо потрібно підвищувати продуктивність аплікації і які є найефективніші способи для цього. А також поговоримо про те, що таке кеш, які його види бувають та, основне — як знайти performance bottleneck?
Відео та деталі заходу: https://bit.ly/45tILxj
MySQL InnoDB Storage Engine: Deep Dive - MydbopsMydbops
This presentation, titled "MySQL - InnoDB" and delivered by Mayank Prasad at the Mydbops Open Source Database Meetup 16 on June 8th, 2024, covers dynamic configuration of REDO logs and instant ADD/DROP columns in InnoDB.
This presentation dives deep into the world of InnoDB, exploring two ground-breaking features introduced in MySQL 8.0:
• Dynamic Configuration of REDO Logs: Enhance your database's performance and flexibility with on-the-fly adjustments to REDO log capacity. Unleash the power of the snake metaphor to visualize how InnoDB manages REDO log files.
• Instant ADD/DROP Columns: Say goodbye to costly table rebuilds! This presentation unveils how InnoDB now enables seamless addition and removal of columns without compromising data integrity or incurring downtime.
Key Learnings:
• Grasp the concept of REDO logs and their significance in InnoDB's transaction management.
• Discover the advantages of dynamic REDO log configuration and how to leverage it for optimal performance.
• Understand the inner workings of instant ADD/DROP columns and their impact on database operations.
• Gain valuable insights into the row versioning mechanism that empowers instant column modifications.
AI in the Workplace Reskilling, Upskilling, and Future Work.pptxSunil Jagani
Discover how AI is transforming the workplace and learn strategies for reskilling and upskilling employees to stay ahead. This comprehensive guide covers the impact of AI on jobs, essential skills for the future, and successful case studies from industry leaders. Embrace AI-driven changes, foster continuous learning, and build a future-ready workforce.
Read More - https://bit.ly/3VKly70
[OReilly Superstream] Occupy the Space: A grassroots guide to engineering (an...Jason Yip
The typical problem in product engineering is not bad strategy, so much as “no strategy”. This leads to confusion, lack of motivation, and incoherent action. The next time you look for a strategy and find an empty space, instead of waiting for it to be filled, I will show you how to fill it in yourself. If you’re wrong, it forces a correction. If you’re right, it helps create focus. I’ll share how I’ve approached this in the past, both what works and lessons for what didn’t work so well.
Getting the Most Out of ScyllaDB Monitoring: ShareChat's TipsScyllaDB
ScyllaDB monitoring provides a lot of useful information. But sometimes it’s not easy to find the root of the problem if something is wrong or even estimate the remaining capacity by the load on the cluster. This talk shares our team's practical tips on: 1) How to find the root of the problem by metrics if ScyllaDB is slow 2) How to interpret the load and plan capacity for the future 3) Compaction strategies and how to choose the right one 4) Important metrics which aren’t available in the default monitoring setup.
"$10 thousand per minute of downtime: architecture, queues, streaming and fin...Fwdays
Direct losses from downtime in 1 minute = $5-$10 thousand dollars. Reputation is priceless.
As part of the talk, we will consider the architectural strategies necessary for the development of highly loaded fintech solutions. We will focus on using queues and streaming to efficiently work and manage large amounts of data in real-time and to minimize latency.
We will focus special attention on the architectural patterns used in the design of the fintech system, microservices and event-driven architecture, which ensure scalability, fault tolerance, and consistency of the entire system.
Conversational agents, or chatbots, are increasingly used to access all sorts of services using natural language. While open-domain chatbots - like ChatGPT - can converse on any topic, task-oriented chatbots - the focus of this paper - are designed for specific tasks, like booking a flight, obtaining customer support, or setting an appointment. Like any other software, task-oriented chatbots need to be properly tested, usually by defining and executing test scenarios (i.e., sequences of user-chatbot interactions). However, there is currently a lack of methods to quantify the completeness and strength of such test scenarios, which can lead to low-quality tests, and hence to buggy chatbots.
To fill this gap, we propose adapting mutation testing (MuT) for task-oriented chatbots. To this end, we introduce a set of mutation operators that emulate faults in chatbot designs, an architecture that enables MuT on chatbots built using heterogeneous technologies, and a practical realisation as an Eclipse plugin. Moreover, we evaluate the applicability, effectiveness and efficiency of our approach on open-source chatbots, with promising results.
LF Energy Webinar: Carbon Data Specifications: Mechanisms to Improve Data Acc...DanBrown980551
This LF Energy webinar took place June 20, 2024. It featured:
-Alex Thornton, LF Energy
-Hallie Cramer, Google
-Daniel Roesler, UtilityAPI
-Henry Richardson, WattTime
In response to the urgency and scale required to effectively address climate change, open source solutions offer significant potential for driving innovation and progress. Currently, there is a growing demand for standardization and interoperability in energy data and modeling. Open source standards and specifications within the energy sector can also alleviate challenges associated with data fragmentation, transparency, and accessibility. At the same time, it is crucial to consider privacy and security concerns throughout the development of open source platforms.
This webinar will delve into the motivations behind establishing LF Energy’s Carbon Data Specification Consortium. It will provide an overview of the draft specifications and the ongoing progress made by the respective working groups.
Three primary specifications will be discussed:
-Discovery and client registration, emphasizing transparent processes and secure and private access
-Customer data, centering around customer tariffs, bills, energy usage, and full consumption disclosure
-Power systems data, focusing on grid data, inclusive of transmission and distribution networks, generation, intergrid power flows, and market settlement data
inQuba Webinar Mastering Customer Journey Management with Dr Graham HillLizaNolte
HERE IS YOUR WEBINAR CONTENT! 'Mastering Customer Journey Management with Dr. Graham Hill'. We hope you find the webinar recording both insightful and enjoyable.
In this webinar, we explored essential aspects of Customer Journey Management and personalization. Here’s a summary of the key insights and topics discussed:
Key Takeaways:
Understanding the Customer Journey: Dr. Hill emphasized the importance of mapping and understanding the complete customer journey to identify touchpoints and opportunities for improvement.
Personalization Strategies: We discussed how to leverage data and insights to create personalized experiences that resonate with customers.
Technology Integration: Insights were shared on how inQuba’s advanced technology can streamline customer interactions and drive operational efficiency.
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
Keywords: AI, Containeres, Kubernetes, Cloud Native
Event Link: https://meine.doag.org/events/cloudland/2024/agenda/#agendaId.4211
What is an RPA CoE? Session 1 – CoE VisionDianaGray10
In the first session, we will review the organization's vision and how this has an impact on the COE Structure.
Topics covered:
• The role of a steering committee
• How do the organization’s priorities determine CoE Structure?
Speaker:
Chris Bolin, Senior Intelligent Automation Architect Anika Systems
The Microsoft 365 Migration Tutorial For Beginner.pptxoperationspcvita
This presentation will help you understand the power of Microsoft 365. However, we have mentioned every productivity app included in Office 365. Additionally, we have suggested the migration situation related to Office 365 and how we can help you.
You can also read: https://www.systoolsgroup.com/updates/office-365-tenant-to-tenant-migration-step-by-step-complete-guide/
Connector Corner: Seamlessly power UiPath Apps, GenAI with prebuilt connectorsDianaGray10
Join us to learn how UiPath Apps can directly and easily interact with prebuilt connectors via Integration Service--including Salesforce, ServiceNow, Open GenAI, and more.
The best part is you can achieve this without building a custom workflow! Say goodbye to the hassle of using separate automations to call APIs. By seamlessly integrating within App Studio, you can now easily streamline your workflow, while gaining direct access to our Connector Catalog of popular applications.
We’ll discuss and demo the benefits of UiPath Apps and connectors including:
Creating a compelling user experience for any software, without the limitations of APIs.
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C0330818
1. IOSR Journal of Applied Physics (IOSR-JAP)
e-ISSN: 2278-4861. Volume 3, Issue 3 (Mar. - Apr. 2013), PP 08-18
www.iosrjournals.org
www.iosrjournals.org 8 | Page
Performance Evaluation of an Adjustable and Collapsible
Natural Convection Solar Food Dryer
1
Yusuf Abdullahi, 2
Musa Momoh, 3
Mahmoud Mhammad Garba and 4
Muazu
Musa
1&2
Department of Physics, Usmanu Danfodiyo University Sokoto, Nigeria.
3&4
Sokoto Energy Research Centre Sokoto, Nigeria
Abstract: The performance evaluation of an adjustable and collapsible natural convection solar food dryer,
capable of taking 14,688 pieces equivalent to 16.52kg of fresh groundnut with maximum moisture content of
35%, at maximum capacity of 3.39m2
, and 3,672 pieces equivalent to 4.06kg of groundnut at minimum capacity
of 0.8475m2
, was carried out. The solar food dryer with air vents gap diameter of 10cm was tested at Sokoto
Energy Research Centre from 29th
September 2012 to 1st
October 2012. It was used to dry 6kg of groundnut per
day for three consecutive days. After drying for about 8 hours each day, it was found that the mass of the
groundnut reduced to 4.5kg in the first day, 4.0kg in the second day and 3.5kg in the third day. At the end of the
study, the collector’s efficiency was 28.3% , dryer’s efficiency was 23.0% and the system efficiency was 81.3%,
while the drying rate of groundnut was 0.25kg/hr
I. Introduction
The food scientist have found that by reducing the moisture content of food to between 10% and 20%,
bacteria, yeast, moulds and enzymes are all prevented from spoiling it since micro organisms are effectively
killed when the internal temperature of food reaches 14 o
f (Harringshaw,1997). The flavor and most of the food
nutritional value of dried food is preserved and concentrated (Scalin,1997). Moreover dried food does not
require any special storage equipment and are easy to transport (Scalin1997). In ancient time of alchemy, drying
was by natural “sun drying” and today in most rural communities of developing countries it is still being
practiced. The diverse crops are spread on the ground and turned regularly until sufficiently dried so that they
can be stored safely.
Direct sun drying is associated with numerous shortcomings, as products are affected by ultraviolet
radiation, dust, rain showers, morning dews, animal and human interference, to mention but a few. In addition,
open sun drying is slow, has no quality control and has a risk of contamination, creating a potential health
hazard. The product’s quality is seriously degraded, sometimes to the extent that they are inedible
(Whitefeild,2000;Diamante & Munro 2004). These caused huge post harvest losses and significantly
contributed to non availability of food in some developing countries. Estimation of these losses are generally
cited to be order of 40%, but they can be nearly 80% (Bassey,1989; Togrul and Pehlivan,2004). Artificial
mechanical drying method such as electric dryers, wood fueled dryers and oil burn dryers were therefore
introduced mostly in developing countries (Nejat.1989). However increase in the cost of electricity and fossil
fuel has made these dryers very non-attractive. Although the spreading of the crop on the ground or on a
platform and drying it directly by sun drying is cheap and successfully employed for many products throughout
the world, where solar radiation and other climatic conditions are favorable, because of the disadvantages of
open-air sun drying process, high cost of mechanical drying mentioned above and a better understanding of the
method of utilizing solar energy to advantage, have given rise to a scientific method called solar drying
(Aklilu.2004). In solar drying, solar dryers are specialized device that controls the drying process and protect
agricultural produce from damage by insect, pest, dust and rain, and in comparism to the natural sun drying,
solar dryers generates higher temperatures lower relative humidity, lower produce moisture content, and reduce
spoilage during the drying process, in addition, it takes up less space, take less time and relatively inexpensive
compared to artificial mechanical drying method (Geda- Gujurat Energy Development Agency, 2003,
www.geda.com). Studies showed that food item dried in a solar dryer were superior to those which are sun
dried when evaluated in terms of taste, color and mould contents (Nandi, 2009). According to Oguntola.
et,al.(2010), solar dried food are quality products that can be stored for extended periods, easily transported at
less cost while still providing excellent nutritive values. Thus solar drying is a better alternative solution to all
the drawbacks of natural sun drying and artificial mechanical drying.
Solar drying has been considered a healthy and efficient means of food preservation most and
importantly, solar dried items are healthy and delicious, outdoor sun drying is best carried out in hot, dry and
breezy days. Under current drying techniques, solar drying offers a limited but feasible economic alternative to
farmers, households and others (Hallak et al., 1996). Different types of solar dryer are becoming increasingly
2. Performance Evaluation of an Adjustable and Collapsible Natural Convection Solar Food Dryer
www.iosrjournals.org 9 | Page
popular as an alternative drying process for healthy dried food products, both for family consumption, and in
food processing as an enterprise to support livelihood through selling value added products (Mahmoud,2009).
According to Roger & Gregoire (2010), a minimum temperature of 30ºC is needed with a relative humidity
preferably below 60 percent, and optimum temperature of 60o
C for drying most food products is reported
adequate for removing moisture from the food crops, so that yeasts, bacteria and moulds cannot grow. If higher
temperatures are used, the crop will cook instead of drying (Mahmoud,2009)
Calculations / Theory
(i) Angle of tilt ( ) of solar collector
According to Sukhatme (1996), angle of tilt ( ) of solar collectors is
= 10 + lat (1)
Where lat = latitude of the place that the drier was designed, which is Sokoto. For the purpose of this design,
= lat . ϕ which is the latitude of Sokoto is 13.3o
(Sokoto Ministry of Land and Survey Sokoto) since there
was no angle of tilt. The dryer could function satisfactorily without angle of tilt.
(ii)There are three major factors affecting food drying: temperature, humidity and air flow. They are interactive.
Increasing the vent area by opening vent covers will decrease the temperature and increase the air flow, without
having a great effect on the relative humidity of the inlet air. In general more air flow is desired in the early
stages of drying to remove free water or water around the cells and on the surface. Reducing the vent area by
partially closing the vent covers will increase the temperature and decrease the relative humidity of the inlet air
and the air flow (Wave Power Plant Inc. 2006). Oguntola et,al (2010 ) reported that volumetric flow rate of air
Va can be expressed as )()()/( mwmhsmvVa , Where v is the average air wind speed in ( m/s), h is
the height of the air gap or vent in( m), w is the width of the collection which, implies the air gap or vent in (m).
This implies that )()/( 2
mAsmvVa
,
A is the area of air gap or vent in(m2
). For the purpose of this
design, the air inlet and outlet gaps or vents are circular in shape, therefore, the formula used to calculate the
volumetric flow rate of air is average wind speed (m/s) multiply by the area of the air gaps or vents which are
circular in shape. It is expressed as
nvAVa (2)
Where aV Volumetric flow rate of air (m3
/s)
A = Area of air gap or vent (m2
)
v = average wind speed (m/s)
n = number of air vents
But A = πr2
, r radius of air or vent
so that, we obtain
nvrnvrVa
22
(3)
(iii) Mass flow rate of air is expressed (Oguntola, 2010) as
am = aaV (4)
Where am = mass flow rate of air, a = density of air (kg/m3
) and aV = volumetric flow rate of air (m3
/s)
(iv) Solar insolation is given by Olaloye(2008) as
cI = HR (6)
Where cI = solar insolation (W/m2
)
H = average daily solar radiation on horizontal surface Olaloye (2008)
R = average effective ratio of solar energy on tilt surface to that on the horizontal surface= 1.0035.
For the purpose of this design, cI = H, because the solar collector was not tilted to any surface hence
no any effective energy ratio R.
(v) Energy Balance on the Absorber.
The total heat energy gained by the collector’s absorber is equal to the heat lost by heat absorber of the collector
(Bukola et,al 2008)
cc AI = pRconveccondu QQQQQ (7)
cI = rate of total radiation incident on the absorber’s surface (W/m2
)
3. Performance Evaluation of an Adjustable and Collapsible Natural Convection Solar Food Dryer
www.iosrjournals.org 10 | Page
Ac = collector’s area (m2
)
Qu = rate of useful energy collected by the air (W)
Qcond = rate of conduction losses by the absorber (W)
Q convec = rate of convective losses from the absorber (W)
QR = rate of long wave re – radiation from absorber (W)
QP = rate of reflection losses from the absorber (W)
Putting Rconveccondl QQQQ (8)
where lQ is the total heat loses( the three heat losses)
If τ is the transmittance of the top glazing and It is the total solar radiation incident on the top surface, therefore,
cccc tAIAI (9)
The reflected energy from absorber is given by expression
ccp tAIQ (10)
= reflection co- efficient of absorber.
Substituting eqn (8), (9) and (10) into (7), yields
cclucc tAIQQtAI
lccu QAIQ )1(
For an absorber, (1- ) = and hence ,
lccu QtAIQ )( (11)
lQ composed of different convection and radiation parts. It is presented in the following form (Bansel et,al.
1990)
)( accll TTAUQ (12)
lU = overall heat transfer co – efficient of the absorber (W/m2
K-1
)
cT = temperature of collector’s absorber (K)
aT = ambient air temperature (K).
)()( acclccu TTAUtAIQ (13)
If the heated air leaving the collector is at the collector’s temperature, the heat gained by the air Qg is
)( acpaag TTcmQ (14)
am = mass of air leaving the dryer per unit time (kg/s) ≡ mass flow rate of air ≡
m
pac = specific heat capacity of air at constant pressure (jkg-1
k-1
)
The collector’s heat removal factor, FR, is the quantity that relates the actual useful energy gain of a collector in
eqn (13) to the useful energy gained by air in eqn (14) expressed by (Bukola and Ayoola,2008) as
FR =
aclcc
acpaa
TTUtIA
TTcm
)(
(15)
Equation (14) can be re- written in terms of RF
gQ = )()( acclcRc TTAUtIFA (16)
The thermal efficiency of the collector is defined as the ratio of heat output to the heat input or ratio of energy
output to energy input, which is the same as the ratio of the energy addition to the air as it passes through the
collector to the energy incident on the collector.
cc
c
AI
Qg
(17)
(vi) The total energy required for drying a given quantity of food item can be estimated using basic energy
balance equation for the evaporation of water (Youcef et,al. 2001, and Bolaji 2005) as in equation 18, where
the oil and fat evaporated from groundnut is negligible at that temperature change.
)( 21 TTcmLm paavw (18)
4. Performance Evaluation of an Adjustable and Collapsible Natural Convection Solar Food Dryer
www.iosrjournals.org 11 | Page
mw = mass of water vapour evaporated from the food item (kg)
Lv = latent heat of vaporization of water (kj/kg)
ma = mass of drying air (kg)
T1 and T2 = the initial and final temperatures of drying air respectively (K)
Cp = specific heat capacity of air at constant pressure (kjkg-1
k-1
(vii) The dryer’s efficiency (ɳd) is expressed as follows
tAI
ML
n
cc
v
d (19)
ɳd = dryer’s efficiency (%)
M = Mass of moisture evaporated (kg)
Lv = Latent heat of vaporization of water (kj/kg)
Ic= Solar insolation (W/m2
)
Ac= Area of solar collector (m²)
t = Time of drying (hrs)
(viii) The collector’s efficiency (ɳc) is expressed (Ezekoye and Enibe2006) as follows
cc
pa
AI
TCV
nc
(20)
ɳc = Collector’s efficiency (%)
Cp = Specific heat capacity of air (kj / kg k)
ΔT = (Tc - Ta) = Temperature elevation (K)
Ac = Area of solar collector (m2
)
Ic = solar insolation (W/m2
)
ρ = Density of air (kg/m3
)
Va = Volumetric flow rate of air (m3
/s)
(ix) Moisture content on percentage wet basis is expressed (Senger et,al 2009) as follows
1
21
W
WW
MCwb
(21)
MC (wb) = Moisture content on percentage wet bases.
W1 = Weight of sample before drying in kg.
W2 = Weight of sample after drying in kg.
(x) Moisture content on percentage dry bases is expressed (Senger et,al 2009) as
2
21
W
WW
MCdb
(22)
(xi) Drying rate is expressed (Ceankoplis, 1993) as
tA
QQM
R
s
d
c
)( 21
(23)
Where Rc = drying rate (kg/mol), M d = total weight of dried sample, As = surface area of dried solid (m2
), t =
drying time (hrs), Q1 = initial moisture content (% wb) and Q2 = final moisture content (% wb)
(xi) Relative humidity is the mass of moisture present in air to the mass of moisture the air is capable of holding
at that temperature.
5. Performance Evaluation of an Adjustable and Collapsible Natural Convection Solar Food Dryer
www.iosrjournals.org 12 | Page
The Pictorial view of Solar Food Dryer.
Performance Test
The solar food dryer was tested at Sokoto Energy Research Centre, Sokoto – Nigeria, from 29th
September 2012 to 1st
October 2012. It was used to dry 6kg of fresh groundnut each day. Before the test was
conducted with material to be dried, the dryer was checked with no load. The sensor E.R.A. type – K digital
thermometer was slotted into the dryer and placed about 1cm above the solar collector to measure the
collector’s temperature (Tc). The mecury- in- bulb thermometer was vertically slotted into the dryer through an
opening created in the glass cover frame with the bulb of the thermometer kept about 20cm above the solar
collector to measure the drying chamber’s temperature (Td). The Mextech digital multi-thermometer was kept in
an open space close to the dryer to measure the ambient temperature (Ta). The sensor of Meteon Irradiance
Meter was place on an open space to receive and measure solar insolation (Ic). The A.M – 4812 digital
Anemometer was placed in the outlet air vent to measure wind speed (v). The dry and wet bulb thermometer
(Hygrometer) was placed in an open space close to the dryer to measure dry air temperature (Th) and wet air
temperature (Tw) the relative humidity (RH). The glass covers were replaced on the dryer and ready for test.
The inlet and outlet air vents were closed until the drying chamber’s temperature above 45o
C was achieved
which is required for drying of food. 6kg of clean fresh groundnut was weighed and uniformly loaded into the
drying chamber, and air vents were open again. The next step was to check to ensure that pynarometer, mextech
multi- thermometer, E.R.A. type- K digital thermometer, A.M- 4812 digital anemometer and other
measurement instruments were working properly. After a short while, the measurements and recording of
variables started from 08.25hrs to 16.25hrs at interval of 30 minutes, each day, from 29th
September 2012 to 1st
October 2012. The mass of groundnut after drying was noted and recorded daily. As the solar drying of
groundnut was taking place, 3kg of the same fresh groundnut was also spread on the open sun for open- sun
drying along side solar drying on the third day to get the rough idea of moisture that will be evaporated from the
fresh groundnut after open sun drying for the same period of time as in solar drying during the test. The mass of
the groundnut after open-sun drying was also noted and recorded.
II. Result And Discussion
Comparism of data collected during the test.
Table1. The averages of the data collected from 29th
September 2012, to 1st
October 2012
29/9/2012 30/9/2012 1/10/2012
Ta (o
C) 33.39 32.50 33.14
Tc (o
C) 70.39 67.29 61.47
Ic (W/m2
) 808.36 772.35 645.65
v (m/s) 0.51 0.51 0.55
Th (o
C) 41.50 41.85 40.44
Tw (o
C) 28.63 28.71 29.18
Td (o
C) 56.50 56.77 50.00
m1 (kg) 6.0 6.0 6.0
m2 (kg) 4.5 4.0 3.5
M (kg) 1.5 2.0 2.5
ma (kg) - - 3.0
6. Performance Evaluation of an Adjustable and Collapsible Natural Convection Solar Food Dryer
www.iosrjournals.org 13 | Page
mb (kg) - - 2.5
Mc (kg) - - 0.5
R.H (%) 16.6 13.14 11.26
m1 = mass of groundnut before solar drying
m2 = mass of groundnut after solar drying
M = mass of moisture evaporated from solar dried groundnut
ma = mass of groundnut before open-sun drying
mb = mass of groundnut after open sun drying
Mc = mass of moisture evaporated from open – sun dried groundnut
The averages of the data collected from 29th
September 2012, to 1st
October 2012 are shown in Table
1. the highest ambient temperature of 33.39o
C was recorded on the first day of the study, which was 29th
of
September 2012, and the reason was because solar insolation was highest about 808.36 W/m2
on that day. The
solar collector’s temperature was also highest about 70.39o
C on the first day of the test, but the mass of
moisture evaporated from the groundnut was least about 1.5kg on the first day, the reason was because the
relative humidity was highest about 16.6% on the first day, which means that the atmospheric air was not well
dried enough to take away moisture from groundnut, when compared to the relative humidity of the second and
the third day, as seen in table one.
On the second day which was 30th
of September 2012, the relative humidity was about 13.14%, which
was lower than that of the first day, and it was one of the reasons why the mass of moisture evaporated from
groundnut during solar drying was about 2.0kg which was relatively higher than that of the first day, this was
because the atmospheric air was more drier to take away moisture from the groundnut relatively faster than the
first day. Still on the second day, the highest temperature of drying chamber about 56.77o
C and highest dry air
temperature about 41.85o
C were recorded, with least ambient temperature of 32.50o
C as seen in Table 1.
On the third day, which was 1st
of October 2012, the mass of moisture evaporated from the groundnut
was highest about 2.5kg, one of the reasons was because the relative humidity was lowest about 11.26% as seen
in Table 1, it means that the atmospheric air was more drier than the first and second day. Another reason why
higher mass of moisture was evaporated from the groundnut on the third day was highest wind speed of about
0.55m/s which translates to higher volumetric and mass flow rates of air, even though the lowest solar
insolation of about 587.71 W/m2
, lowest temperature of drying chamber about 50.00o
C, lowest solar collector’s
temperature of about 61.47o
C and lowest dry air temperature about 40.44o
C were recorded.
Statistical Analysis and reliability of test data for efficiency analyses in the study
The statistical analysis of the data on table 1 was carried out using the following equations;
(i)
n
i
ix
n
x
1
1
(25)
Where
x is the mean value of test data
n is the number of observations
ni xxxx ....21
(ii)
n
i
i xx
n 1
22
)(
1
(26)
Where
2
is the variance
(iii)
2
(27)
Where is the standard deviation
(iv)
n
ES
.. (28)
Where S.E. is the standard error of the mean
(v) The upper and lower limits of Confidence interval (C.I) at 95% and 0.05 level of significance were
calculated using;
ESZx .
05.0
7. Performance Evaluation of an Adjustable and Collapsible Natural Convection Solar Food Dryer
www.iosrjournals.org 14 | Page
This implies that
n
x
n
x
96.1;96.1 (29)
Where 05.0Z =1.96
and
n
= S.E.
The result of the statistical analysis are shown in Table 2, below
Table 2. Result of statistical analysis of test data.
x
2
..ES Confidence interval
upper limit lower limit
Ta(o
C) 33.01 0.211 0.459 0.265 35.53 32.49
Tc(o
C) 66.38 20.508 4.529 2.165 71.51 61.25
Td(o
C) 54.42 14.693 3.833 2.213 58.76 50.08
Th(o
C) 41.26 0.539 0.734 0.424 42.09 40.42
Tw(o
C) 28.00 5.509 2.347 1.355 30.66 25.34
Ic(W/m2
) 722.8 14012.5 118.3 68.344 856.76 587.61
v(m/s) 0.52 0.00053
3
0.0231 0.013 0.55 0.49
RH(%) 13.67 7.337 2.709 1.564 16.74 10.61
As seen in table 2, the range of the test data in Table 1 falls within the upper and lower limits of 95%
confidence interval and 0.05 level of significance as shown in table 2, which implies that the test data should be
accepted because it is reliable.
Volumetric flow rate of air in the study
The volumetric flow rate of air was calculated using equation (2) below
nvrnvrVa
22
Va = 3.142 x (0.05)2
x 0.52 x 4 = 0.0163384m3
/s
The solar collector’s efficiency ( cn ) in the study
The solar collector’s efficiency was calculated using equation (20) as follows
3.28100283.0
448.2
695.0
390.3722.0
73.34000.10163384.0225.1
cc
pa
AI
TCV
c
%
[ΔT = Tc – Ta = (339.8-306.1) K = 34.73K]
From table 4.1
M= kg0.2
3
0.6
3
5.20.25.1
The solar dryer’s efficiency ( dn ) in the study
The solar dryer’s efficiency was calculated using equation (19) as follows
%0.23100230.0
581.19
52.4
00.8390.3722.0
260.20.2
tAI
ML
cc
d
Comparism of efficiencies in the study
8. Performance Evaluation of an Adjustable and Collapsible Natural Convection Solar Food Dryer
www.iosrjournals.org 15 | Page
As it is clearly seen, the solar collector’s efficiency obtained in the study was 28.3%, which is greater
than 10% obtained by Ezekoye and Enebe, (2006). Also looking at the solar dryer’s efficiency obtained in the
study was 23.0% which is greater than 11% obtained by Senger, (2009) and 22% obtained by Ezekoye and
Enebe, (2006). The solar collector’s efficiency was greater than the dryer’s efficiency, as it has always been in
most cases. Dividing the dryer’s efficiency with collector’s efficiency, we obtain the system efficiency ( s )
(Aklilu,2004). The system efficiency in the study was 81.3%
Drying rate of groundnut in the study.
From Table 1, we can conclude that 2.0kg of moisture was evaporated from 6.0kg of fresh groundnut
in a drying period of 8 hours during solar drying. This implies that considering the mass of moisture evaporated
and time of evaporation, the drying rate of fresh groundnut under solar drying was 0.25kg/hr, which means that
0.25kg of moisture is evaporated from the fresh groundnut in one hour. Also for the one day open sun drying,
0.5kg of moisture was evaporated from 3.0kg of fresh groundnut which means that drying rate of fresh
groundnut under open sun drying was 0.0625kg/hr. Solar drying was four times faster that open sun drying.
Effect of temperatures and solar insolation on drying rate in the study
Figure 1. The graph of solar insolation (Ic), ambient temperature (Ta), solar collector’s temperature (Tc) and
temperature of drying chamber (Td) with local time (t)
From figure 1 above, the temperature of the drying chamber rose from above 30o
C in the morning
hours and reached above 50o
C from 10.55hrs to 15.25hrs, and was maintain for over four hours till 15.25hrs.
This implies that is capable of retaining moderate heat in the drying chamber for reasonable period of time
which enhanced it ability to remove moisture from the groundnut and dry the fresh groundnut relatively faster.
Also in figure 1, looking at the ambient temperature curve and solar collector’s temperature curve, we could
observe that there is a reasonable difference between the two temperatures. For example, the maximum ambient
temperature was above 35o
C at 12.55hrs and 13.55hrs while the maximum solar collector’s temperature was
80o
C at 12.55hrs and 13.55hrs. This temperature difference of about 45o
C, that gives the temperature elevation
in the dryer, is significant enough to make the dryer generate enough heat that will easily remove substantial
part of moisture in the fresh groundnut thereby drying it faster. Likewise, in the same figure, solar insolation
above 600W/m2
was maintained in most hours of the days, especially from 9.25hrs to 13.55hrs. The highest was
above 1000W/m2
with the least less than 100W/m2
at 16.24hrs, the lowest solar insolation at 16.25hrs was due
to cloud cover. Generally the solar insolation in most hours of the day was adequate to generate reasonable
ambient temperature, solar collector’s temperature and drying chamber’s temperature which consequently
facilitated and fasten the rate at which moisture was removed from the groundnut
Variation solar collector’s efficiency and solar insolation with time
0
200
400
600
800
1000
1200
0
10
20
30
40
50
60
70
80
90
8.25
8.55
9.25
9.55
10.25
10.55
11.25
11.55
12.25
12.55
13.25
13.55
14.25
14.55
15.25
15.55
16.25
SolarInsolation(W/m2)
Temperature(oC)
Local time (hrs)
t
Ta
Td
Tc
Ic
9. Performance Evaluation of an Adjustable and Collapsible Natural Convection Solar Food Dryer
www.iosrjournals.org 16 | Page
Figure 2. The graph of solar insolation (Ic) and solar collector’s efficiency (ɲc) with time (t)
As seen in figure 2, the solar collector’s efficiency was less than 30% for about five out of eight hours
of the days during the test which confirms the average solar collector’s efficiency of 28.3% calculated, Also as
shown in fig. 2, solar collector’s efficiency was slightly above 30% for about two hours of the days of the study
and was between 40% to slightly above 70% in only one hour of the days.
While the solar collector’s efficiency was slightly above 70% at 10.25 hours, the solar insolation
reached the highest value, slightly above 1000W/m2
at 12.55hrs, but solar insolation above 600W/m2
was
maintained in most hours of the days during the test, especially from 9.25hrs to 13.55hrs.
Effect of relative humidity and solar insolation on drying rate in the study
Figure 3. The graph of relative humidity (RH) and solar insolation (Ic) with local time (t)
From figure 3, the relative humidity was generally low with the least about 6% in the morning hours at
8.25hrs and the highest less than 16% around the mid- day. Lower relative humidity of less than 16% with a
moderate solar insolation of slightly above 600W/m2
implies that the air circulating in the drying chamber was
fairly hot and dry to take away reasonable amount of moisture from the fresh groundnut to the atmosphere
which will lead to faster drying rate of the groundnut.
0
10
20
30
40
50
60
70
80
90
0
200
400
600
800
1000
1200
8.25
8.55
9.25
9.55
10.25
10.55
11.25
11.55
12.25
12.55
13.25
13.55
14.25
14.55
15.25
15.55
16.25
Collector'sefficiency(ɲc)in%
Solarinolation(W/m2)
Local time (t) in hrs
t/hrs
Ic
ɲc(%)
0
200
400
600
800
1000
1200
0
2
4
6
8
10
12
14
16
18
8.25
8.55
9.25
9.55
10.25
10.55
11.25
11.55
12.25
12.55
13.25
13.55
14.25
14.55
15.25
15.55
16.25
Solarinsolation(W/m2)
Relativehumidity(%)
Local time (hrs)
t
RH
Ic
10. Performance Evaluation of an Adjustable and Collapsible Natural Convection Solar Food Dryer
www.iosrjournals.org 17 | Page
Effect of volumetric flow rate and wind speed on drying rate of groundnut in the study
Figure 4. The graph of wind speed (v) and volumetric flow rate (Va) against local time (t)
As seen in figure 4, the highest wind speed recorded was slightly above 1.0 m/s at 10.25hrs, which also
lead to the highest volumetric flow rate of air almost 0.04 m3
/s at the same time in the study. But in most hours
of the days in the study, the volumetric flow rate of air was between 0.015m3
/s and 0.020m3
/s, while the wind
speed was below 1.0m/s in most hours of the days of the study. This clearly shows that there is a direct
proportion between wind speed and volumetric flow rate of air in the natural convection solar dryer designed
and constructed in the study
III. Conclusion
The performance evaluation of an adjustable and collapsible box type natural convection solar food
dryer was successfully carried out. The dryer has a solar collector’s efficiency of 28.3%, dryer’s efficiency of
23.0% and system efficiency of 81.3%, with a drying rate of 0.25kg/hr, which was four times greater than the
drying rate of open sun that was 0.0625kg/h in the study.
Refrences
[1]. Aklilu, T. (2004): “Experimental Analysis for Performance Evaluation of Solar Food dryer”. Research Thesis. Department of
Mechanical Engineering. School of Graduate Studies, Addis Ababa University.
[2]. Bukola, O. B ; Ayoola, P. O. (2008): Performance Evaluation of a Mixed- Mode Solar Dryer. A.U.J.T. 11(4): 225- 231
[3]. Bolaji, B. O (2005): Development and Performance Evaluation of a Box Type Absorber Solar Air Collector for Crop Drying.
Journal of food technology 3 (4): 595 – 600.
[4]. Bassy, M.W (1989) :Development and Use of Solar Drying Technologies. Nigerian Journal of Solar Energy. 89:133- 64
[5]. Ceankoplis, C. J (1993) : Transport Process and Unit Operations. 3rd
Edition Prentice Hall, Englewood: 508-512
[6]. Diamante, L.M ; Munro, P.A, (2004), Mathematical Modelling of Thin Layer Solar Drying of Sweet Potatos, Solar Energy,(51)
176 - 271
[7]. Ezekoye, B.A ; Enebe, O.M (2006): “Development and Performance Evaluation of Modified Integrated Passive Solar Grain
Dryer”. Pacific Journal of Science and Technology. 7(2) : 185- 190.
[8]. Geda- Gujurat Energy Development Agency, 2003, www.geda.com
[9]. Hallak, H; Hilal. J ; Rahhal, .R (1996): The Staircase Solar Dryer and Characteristics. Renewable Energy. 7 (2) : 177- 183.
[10]. Harringshaw, D. (1997): All About Food Drying, The Ohio State University Extension Facts Sheet – hyg – 5347- 97,
www.ag.ohio-state.edu/
[11]. Mahmoud, M.G. (2009): Thermal Energy Materials and System Optimization for Solar Drying and Cooking Applications.
P.hD Thesis. Department of Built Environment, Faculty of Engineering, University of Nottingham, United kingdom. 2009
[12]. Nejat, T. V, (1989): Alternative Energy Sources viii, Hemisphere Publishing Company, 1
[13]. Nandi, P (2009): Solar Thermal Energy Utilization in Food Processing Industry in India, Percific Journal of Science and
Technology 10 (1) :123- 131
[14]. Olaloye, D. O (2008) : The Design and Construction of Solar Incubator, 2008 Project Report, Submitted to Department of
Mechanical Engineering, University of Agriculture, Aboekuta.
[15]. Oguntola, J. A ; Collins, N. N ; Olayinka, A. (2010): ”Design and Construction of a Domestic Passive Solar Food Dryer”.
Leonardo Journal of Sciences. 16
[16]. Roger, G ; Gregoire, P. E (2010) : Understanding Solar Food Dryers. VITA Technical Paper. 15 (11) 1-27
[17]. Senger, S.H; Khandetod Y.P; Mohod, A.G (2009) : ”Low Cost Solar Dryer for Fish”. African Journal of Environmental Science
and Technology. 3(9) 265-271.
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
0.04
0.045
0
2
4
6
8
10
12
14
16
18
8.25
8.55
9.25
9.55
10.25
10.55
11.25
11.55
12.25
12.55
13.25
13.55
14.25
14.55
15.25
15.55
16.25
Volumetricflowrate(m3/s)
Windspeed(m/s)
Local time (hrs)
t
v
Va(m3/s)
11. Performance Evaluation of an Adjustable and Collapsible Natural Convection Solar Food Dryer
www.iosrjournals.org 18 | Page
[18]. Sukhatme, S. P. (1996) : Solar Energy Principles of Thermal Collection and storage, Tata McGraw Hill Publishing Company
Limited, 1996.
[19]. Scalin, D. (1997): The Design, Construction and Use of an Indirect Through Pass Solar Food `Dryer. Home Power Magazine. 57 :
62 – 72.
[20]. Togrul, I.T; Pehlivan, D. (2004): Modelling of Thin Layer Drying Kinetics of some Fruits Under Open Air Sun Drying
Process, J.Food Engin. 65:413- 25
[21]. Whitefield, D.E. (2000) Solar Dryer Systems and Internet, Important Resources to Improve Food Preparation. 2000 Proceedings of
International Conference on Solar Cooking, Kimberly, South Africa.
[22]. Yousef- Ali, S; Messaoudi, H ; Desmons, J. Y ; Abene, A ; Le Ray, M (2001) : Detrmination of the Average Co – efficient of
Internal Moisture Transfer During the Drying of a Thin Bed Potato Slices. J. Food Engin. 48 (2): 95 – 101.