This document summarizes research on using magnetic induction heating to simultaneously heat and stir mixtures of carboxylic acid components for preparing eutectic mixtures. Eutectic mixtures have the lowest possible melting point, so conventional heating and stirring methods did not allow for proper mixing. The researchers applied magnetic induction heating, which provides simultaneous heating and stirring. They found that using this method, the melting points of different acid-acid mixtures were the same each time, showing uniform mixing had occurred. Magnetic induction heating is an accurate, fast and energy-efficient technique for preparing eutectic mixtures.
Effect of cu co mixed metal oxides on the combustion of psan-htpb based solid...eSAT Journals
Abstract Composite propellants based on ammonium perchlorate (AP) as oxidizer are state-of-the-art. However, global environmental impact restricts AP-based propellants because of their high chlorine exhaust. Therefore, efforts are on to innovate propellants with clean exhaust. Ammonium nitrate (AN) has, thus, regained importance in the field of propellants and explosives, more specifically in insensitive formulations, because of its clean burning and low hazard. However, the stumbling block for the application of AN - as solid propellant oxidizer has been its dimensional instability caused by phase transformation which results in increase of volume and porosity of the propellant grain. This can be overcome by the use of phase stabilized ammonium nitrate (PSAN). In the present study AN phase stabilized by incorporating 10% KN to prepare composite solid propellant. Copper-Cobalt mixed metal oxides have been synthesized via citric acid complexing method. Three different catalysts were prepared with different Cu-Co molar ratios 1, 0.5 And 2 in the initial reactants. The synthesized catalysts were then added to the PSAN-HTPB(Phase Stabilized Ammonium Nitrate- Hydroxyl Terminated Poly-Butadiene) composite formulations. These propellant samples were subjected to burn rate measurement in a Crawford High Pressure Strand Burner and thermal degradation studies in Simultaneous Thermal Analyzer (STA). The thermal decomposition and burn rate of the propellant is observed maximum on the addition of Copper-Cobalt mixed metal oxide catalyst with molar ratio 2. A total of six propellant samples catalyzed and non-catalyzed and one preheated virgin sample were undertaken for the above analysis and results obtained are discussed. It has been observed that except the propellant sample with Cu-Co-III and virgin propellant where PSAN was prepared by solid mixing, other propellant samples were hard to burn. KeyWords:Solid propellants, Ammonium nitrate, Phase stabilization, Burn rate, Thermal decomposition, Mixed metal oxides, Catalytic combustion.
This document summarizes research on using iron-based catalysts containing a second metal like magnesium or molybdenum for direct coal liquefaction. The key points are:
1) Iron-based catalysts containing magnesium or molybdenum as a second metal were tested for direct coal liquefaction.
2) Molybdenum increased catalyst activity the most, resulting in over 90% coal conversion at 400°C. Oil yields also increased significantly with molybdenum.
3) Tetralin and phenanthrene were used as solvents, with catalytic effects being more evident using phenanthrene as it is a poorer hydrogen donor.
Kinetic And Mechanism of Oxidation of Cobalt Metal Complex By Acidic Potassiu...IJMERJOURNAL
ABSTRACT: The Kinetic of oxidation of Cobalt derived from 8-hydroxy quinolone and salicylaldehyde by potassium permanganate has been studied in the presence of acidic medium. The overall reaction is first order with respect to KMnO4, Substrate acid and temperature. No effect of salts has been found suitable mechanism is given.
The document experimentally investigates conditions for producing high concentrations of hypochlorous acid water without a barrier membrane between electrode plates. It examines factors like electrode plate interval, flow rate of sodium chloride solution, sodium chloride concentration, and current density. The concentration of available chlorine is measured using a residual chlorine meter. Results show that current density and sodium chloride concentration strongly affect the high concentration production of available chlorine. These results can help produce chlorinated water called hypochlorous acid water.
An Automated Model to Detect Fake Profiles and botnets in Online Social Netwo...IOSR Journals
This document discusses an automated model for detecting fake profiles and botnets in online social networks. It begins with background on the prevalence of fake accounts, which can compromise user privacy and security. Next, it reviews related work on using data hiding techniques like steganography and watermarking to embed information in profile pictures in order to identify suspicious accounts. The proposed model aims to automatically detect fake profiles and botnets to replace current manual methods that are costly and labor-intensive.
Determining the Different E-Services Required By the Pakistani CitizensIOSR Journals
This document summarizes a study conducted to determine the different e-services required by citizens in Pakistan. The study found that the top priorities for e-services included:
1. E-education facilities like online courses and access to university information.
2. Online registration of citizens at district and local levels integrated with personal information.
3. Online payment and deduction of taxes.
4. Access to higher government officials and authorities through complaint systems.
5. E-health facilities like online doctor appointments and medical information.
6. Online police complaint services and access to case information.
7. Online training for government employees on IT and internet services.
1) The document analyzes the effect of lightning strikes and thunder on television signal transmission in Nigeria.
2) Data collected from the Nigerian Television Authority in 2013-2014 showed that heavy lightning at the beginning and end of the rainy season caused image fading, breaking of images, and sometimes caused transmitters to go offline.
3) Lightning strikes damaged transmitters by affecting parts like exciters, power units, and modulators. This kept stations offline for weeks for repairs.
4) The author concludes that Nigeria's communication commission should ensure television stations are digitalized and have powerful lightning arresters installed to reduce the effects of lightning on transmissions.
This document discusses the selection of spring materials using the PROMETHEE method. It begins with an introduction to springs, their history, common materials used, and the importance of selecting the right material. It then discusses previous literature on spring material testing and optimization. The document considers seven spring material alternatives that are evaluated based on eight selection criteria using the PROMETHEE II and GAIA techniques. Chrome silicon alloy steel is found to be the best material, followed by high carbon steel and Inconel 600, with Monel K500 as the worst choice.
Effect of cu co mixed metal oxides on the combustion of psan-htpb based solid...eSAT Journals
Abstract Composite propellants based on ammonium perchlorate (AP) as oxidizer are state-of-the-art. However, global environmental impact restricts AP-based propellants because of their high chlorine exhaust. Therefore, efforts are on to innovate propellants with clean exhaust. Ammonium nitrate (AN) has, thus, regained importance in the field of propellants and explosives, more specifically in insensitive formulations, because of its clean burning and low hazard. However, the stumbling block for the application of AN - as solid propellant oxidizer has been its dimensional instability caused by phase transformation which results in increase of volume and porosity of the propellant grain. This can be overcome by the use of phase stabilized ammonium nitrate (PSAN). In the present study AN phase stabilized by incorporating 10% KN to prepare composite solid propellant. Copper-Cobalt mixed metal oxides have been synthesized via citric acid complexing method. Three different catalysts were prepared with different Cu-Co molar ratios 1, 0.5 And 2 in the initial reactants. The synthesized catalysts were then added to the PSAN-HTPB(Phase Stabilized Ammonium Nitrate- Hydroxyl Terminated Poly-Butadiene) composite formulations. These propellant samples were subjected to burn rate measurement in a Crawford High Pressure Strand Burner and thermal degradation studies in Simultaneous Thermal Analyzer (STA). The thermal decomposition and burn rate of the propellant is observed maximum on the addition of Copper-Cobalt mixed metal oxide catalyst with molar ratio 2. A total of six propellant samples catalyzed and non-catalyzed and one preheated virgin sample were undertaken for the above analysis and results obtained are discussed. It has been observed that except the propellant sample with Cu-Co-III and virgin propellant where PSAN was prepared by solid mixing, other propellant samples were hard to burn. KeyWords:Solid propellants, Ammonium nitrate, Phase stabilization, Burn rate, Thermal decomposition, Mixed metal oxides, Catalytic combustion.
This document summarizes research on using iron-based catalysts containing a second metal like magnesium or molybdenum for direct coal liquefaction. The key points are:
1) Iron-based catalysts containing magnesium or molybdenum as a second metal were tested for direct coal liquefaction.
2) Molybdenum increased catalyst activity the most, resulting in over 90% coal conversion at 400°C. Oil yields also increased significantly with molybdenum.
3) Tetralin and phenanthrene were used as solvents, with catalytic effects being more evident using phenanthrene as it is a poorer hydrogen donor.
Kinetic And Mechanism of Oxidation of Cobalt Metal Complex By Acidic Potassiu...IJMERJOURNAL
ABSTRACT: The Kinetic of oxidation of Cobalt derived from 8-hydroxy quinolone and salicylaldehyde by potassium permanganate has been studied in the presence of acidic medium. The overall reaction is first order with respect to KMnO4, Substrate acid and temperature. No effect of salts has been found suitable mechanism is given.
The document experimentally investigates conditions for producing high concentrations of hypochlorous acid water without a barrier membrane between electrode plates. It examines factors like electrode plate interval, flow rate of sodium chloride solution, sodium chloride concentration, and current density. The concentration of available chlorine is measured using a residual chlorine meter. Results show that current density and sodium chloride concentration strongly affect the high concentration production of available chlorine. These results can help produce chlorinated water called hypochlorous acid water.
An Automated Model to Detect Fake Profiles and botnets in Online Social Netwo...IOSR Journals
This document discusses an automated model for detecting fake profiles and botnets in online social networks. It begins with background on the prevalence of fake accounts, which can compromise user privacy and security. Next, it reviews related work on using data hiding techniques like steganography and watermarking to embed information in profile pictures in order to identify suspicious accounts. The proposed model aims to automatically detect fake profiles and botnets to replace current manual methods that are costly and labor-intensive.
Determining the Different E-Services Required By the Pakistani CitizensIOSR Journals
This document summarizes a study conducted to determine the different e-services required by citizens in Pakistan. The study found that the top priorities for e-services included:
1. E-education facilities like online courses and access to university information.
2. Online registration of citizens at district and local levels integrated with personal information.
3. Online payment and deduction of taxes.
4. Access to higher government officials and authorities through complaint systems.
5. E-health facilities like online doctor appointments and medical information.
6. Online police complaint services and access to case information.
7. Online training for government employees on IT and internet services.
1) The document analyzes the effect of lightning strikes and thunder on television signal transmission in Nigeria.
2) Data collected from the Nigerian Television Authority in 2013-2014 showed that heavy lightning at the beginning and end of the rainy season caused image fading, breaking of images, and sometimes caused transmitters to go offline.
3) Lightning strikes damaged transmitters by affecting parts like exciters, power units, and modulators. This kept stations offline for weeks for repairs.
4) The author concludes that Nigeria's communication commission should ensure television stations are digitalized and have powerful lightning arresters installed to reduce the effects of lightning on transmissions.
This document discusses the selection of spring materials using the PROMETHEE method. It begins with an introduction to springs, their history, common materials used, and the importance of selecting the right material. It then discusses previous literature on spring material testing and optimization. The document considers seven spring material alternatives that are evaluated based on eight selection criteria using the PROMETHEE II and GAIA techniques. Chrome silicon alloy steel is found to be the best material, followed by high carbon steel and Inconel 600, with Monel K500 as the worst choice.
This document investigates the effect of exhaust gas recirculation (EGR) while adopting different air filters on the performance and emissions of a diesel engine. Experiments were conducted on a single cylinder diesel engine running with various air filters (AFM1-AFM4) at different EGR levels of 5%, 10%, and 15%. The performance parameters such as brake thermal efficiency and emissions such as CO, CO2, NOx, UBHC, O2, and smoke were measured and the results are presented and discussed. The findings show that brake thermal efficiency decreased with increasing EGR levels for all air filters. EGR is found to be effective in reducing NOx emissions but increases CO and UHC emissions.
The document presents a computer model for assessing the effect of suction-line heat exchangers (SLHXs) on the performance of alternative refrigerants to R-22. The model is validated by comparing its results to previous analyses that used REFPROP and CoolPack software. The model is then used to analyze the performance of six refrigerants - R-134a, R-152a, R-407C, R-410A, R-290, and R-600a - at different subcooling degrees from 2 to 10°C. The results show that R-152a, R-407C, and R-600a are suitable alternatives to R-22.
Combination of Cubic and Quartic Plane CurveIOSR Journals
The document discusses various types of plane quartic curves defined by cubic and quartic equations, including:
- The bicorn curve, which has two cusps and is symmetric about the y-axis.
- The Klein quartic, which has the highest possible order automorphism group for its genus.
- The bullet-nose curve, which has three double points and three inflection points.
- The lemniscate of Bernoulli, which resembles the numeral 8 and has a double point at the origin.
- The Cartesian oval, which is the set of points with a linear combination of distances from two fixed points.
- The deltoid curve, which resembles the Greek letter delta
This document proposes a system for identifying, tracking, and controlling car theft using a GPS module, Android mobile phone, and control system. If the car is stolen, the owner will receive an MMS with an image of the thief captured by a hidden camera and SMS messages with the car's latitude and longitude. The owner can then send a secret code by SMS to stop the car remotely via a microcontroller. Principal component analysis is used for face recognition to identify thieves. The low-cost system aims to provide reliable vehicle security and assist investigators in identifying hijackers.
This document provides a review of synthetic aperture radar (SAR) engineering. It begins with an introduction to SAR and its uses in remote sensing and defense. It then discusses designs for SAR systems and antennas. The document reviews recent literature on SAR, including works discussing antenna mask design to optimize SAR performance, polarimetric SAR for mapping terrain changes, and using SAR to monitor cryospheric regions. It concludes that SAR is a useful technique for achieving good image quality through optimized antenna design.
High Performance Error Detection with Different Set Cyclic Codes for Memory A...IOSR Journals
The document presents a proposed error detection method using majority logic decoding with difference set cyclic codes. The proposed method can detect up to five bit errors in the first three decoding cycles, improving performance over traditional majority logic decoding approaches. It uses a control unit to evaluate parity check sums over the first three cycles, and can detect errors without fully decoding the codeword when no errors are found. This reduces decoding time compared to approaches that fully decode each codeword. The proposed method is also less complex than alternatives using syndrome calculation for error detection. Simulation results showed the proposed method can detect errors faster while using less memory and power than traditional approaches.
This document describes a software design approach for developing secure data management applications using model-driven development. It involves modeling an application's conceptual model, security model, and graphical user interface model. A model transformation lifts security policies from the security model to the GUI model. The models are validated for correctness before code generation. The approach was implemented in a tool called Sculpture, which was used to develop three secure web applications: a volunteer management app, electronic health record app, and meal service management app. The approach aims to improve on previous work by providing more expressive modeling languages, validation of models, and automated generation of secure multi-tier applications.
This document describes the modeling and simulation of the transfer function characteristics of an RLC circuit using MATLAB/GUI. It begins with an introduction to RLC circuits and their importance. It then provides theoretical background on transfer functions, series RLC circuits, and step responses. The document proceeds to describe the development of a MATLAB graphical user interface to model and simulate an RLC circuit. It provides examples of simulations using different component values and discusses the results. Validation of the simulator is also presented by comparing results from the GUI simulator to manual calculations. The conclusion is that the GUI simulator allows for easy understanding and analysis of RLC circuit behavior as components values vary.
This document summarizes a research study that analyzed the performance of students working on different chairs and tables of varying heights. Two students of different heights assembled and disassembled a toy car on five tables with rotations of five chairs. The time taken was observed and production rates were calculated and compared. The results showed that the taller student was more comfortable and efficient with the given chair-table combinations. Ergonomics aims to design workspaces that balance worker characteristics and task demands to enhance productivity, safety, and well-being. Consideration of anthropometrics and posture is important for office furniture to properly fit its users.
This document discusses improving quality of service in OFDMA relay networks through retransmission. It analyzes two models for OFDMA transmission - distributed permutation and contiguous permutation. It evaluates the performance of two scheduling algorithms (linear programming and greedy) on these models to select the best one. Packet loss is detected using synchronization techniques, and retransmission is used to improve throughput by resending lost packets. The goal is to enhance performance of OFDMA-based relay networks for next-generation cellular standards.
This document summarizes a numerical simulation of ventilation systems in the archaeological tomb of Horemheb in the Valley of the Kings in Luxor, Egypt. The study used computational fluid dynamics to model airflow patterns, temperature, and relative humidity within the tomb under different ventilation system designs and numbers of visitors. The results showed that mechanical ventilation helped maintain temperatures around 305K and relative humidity below 70% within recommended comfort levels. Peak humidity occurred in winter months, so limiting visits then was suggested. Air velocity was kept below 0.12 m/s within the tomb to prevent wall painting erosion.
A study to Design and comparison of Full Adder using Various TechniquesIOSR Journals
Abstract: Adders is widely used in applications such as digital signal processing (DSP) and microprocessors. In this paper Half adders are simulated and analyzed based on power dissipation, area and speed on 90nm technology using Microwind and Dsch tool. Half Adder is the basic building block in Parallel Feedback Carry Adder (PFCA). Keywords: Full adder, Half adder, PFCA, VLSI
This document summarizes a study on traffic safety and the public transport system in Hyderabad, India. It finds that buses are involved in approximately 12% of fatal crashes in Hyderabad. Low-floor buses with mechanical doors and segregated lanes for pedestrians and bicyclists could significantly reduce fatal crashes involving buses and vulnerable road users. The study analyzed traffic fatality data in Hyderabad and other major Indian cities and found that buses, pedestrians, bicyclists, and motorcyclists account for the majority of road fatalities.
This document summarizes an experimental study on controlling base pressure in a suddenly expanded flow using micro jets. The study varied the area ratio of the enlarged duct, the length to diameter ratio of the duct from 10 to 1, and nozzle pressure ratios from 1.5 to 3.0. Micro jets located around the base region were used for active control. Results found that micro jets were effective at increasing base pressure and did not disturb the wall pressure distribution. For length to diameter ratios from 4 to 2, oscillations in pressure were observed at nozzle pressure ratios of 2.5 to 3.0, but these were reduced by increasing the length to diameter ratio or decreasing the nozzle pressure ratio. The micro jets provided effective control of base pressure under
This document summarizes a study on optimizing and reducing the weight of a universal joint yoke through the use of composite materials. The study first analyzes a conventional universal joint yoke made of SM45C steel using finite element analysis. It then models modified universal joint yokes made of carbon/epoxy composite and Kevlar/epoxy composite. Calculations of torsional strength, buckling strength, and bending natural frequency show that both composite designs meet requirements while reducing weight compared to steel. Static stress analyses and modal analyses using FEA are presented and compared between materials. The study aims to improve mechanical properties and reduce weight of universal joints through composite material optimization.
Traditional use of Monocotyledon Plants of Arakuvalley Mandalam, Visakhapatna...IOSR Journals
An ethno-medico botanical survey of plants used in the treatment of different type of diseases of Arakuvalley Mandalam, Visakhapatnam district, Andhra Pradesh was conducted. The information was collected on the basis of personal interviews with traditional healers, tribal doctors and old women of the society. The investigation revealed that 34 Monocotyledon plant species belonging to 10 families and 28 genera are commonly used in the treatment of varies ailments
The document summarizes a study on gain flattening of a hybrid optical amplifier for a 64×20Gbps dense wavelength division multiplexing system using hybrid optical amplifiers. The hybrid amplifier combines an erbium doped fiber amplifier and a Raman amplifier. The system was simulated with 64 channels spaced at 12GHz between 185-185THz. The hybrid amplifier provided a maximum gain of 21.7dB with a gain flatness of 2.5dB. Varying the input pump power, a maximum gain of 13.06dB was observed at -26dB pump power. The hybrid amplifier design achieved high gain and gain flatness suitable for dense wavelength division multiplexing systems.
This document describes a microcontroller-based touch switch system using an ATMega8 microcontroller chip. The system allows multiple touch switches to be added digitally and at low cost compared to analog switches. When a touch point is pressed, the microcontroller detects the input signal, turns on the load by controlling a relay, and when pressed again turns off the load. The system provides a safe and reliable switching method that can be used for household applications and to control loads from a distance.
This document summarizes a research paper that proposes and evaluates a novel interleaved ZCS boost DC-DC converter topology for photovoltaic interfaces. The converter uses two quasi-resonant switch blocks and lossless snubbers to achieve soft switching. Simulation results show the converter achieves reduced voltage and current ripple compared to conventional designs. A dual loop control scheme with an outer voltage loop and inner current loop is used to regulate the output. Coupling inductors between converter cells further improve transient response and reduce ripple. The proposed converter design and control scheme effectively interfaces photovoltaic systems with loads.
This document presents the conceptual design of a new "Lotos" motorcar. The design was inspired by the shape of lotus flower petals and aims to emulate their graceful yet powerful form. The conceptual design process began with sketches of potential shapes and symbols. A 3D computer model was then developed using polygonal extrusion in 3ds Max software. Various design elements were smoothed and given materials. Renderings were produced using V-Ray to visualize the final shaded conceptual model. The goal of the conceptual design was to create a high-performance sports car with the elegance and vigor suggested by its namesake, the lotus flower.
This document summarizes a study on the leaching behavior of cobaltous oxide (CoO) and cobalto-cobaltic oxide (Co3O4) in ammonia and acid solutions. The dissolution of cobaltous oxide was found to be chemically controlled, with apparent activation energies of 54.0 kJ/mol and 56.5 kJ/mol in ammonia and acid solutions, respectively. The dissolution rate of cobalto-cobaltic oxide in ammonia-ammonium carbonate was very slow at low temperatures. At higher temperatures, less than 2 x 10-5 mol/dm3 of cobalt remained in solution due to precipitation of cobalt carbonate and cobalto-cobalt
The document describes the synthesis of Schiff base ligands derived from citral and valine and their complexes with Cu(II), Ni(II), and Co(II). The structures of the complexes were characterized using IR, UV-vis, and magnetic susceptibility measurements. The Cu(II) and Ni(II) complexes were proposed to have distorted octahedral geometry while the Co(II) complex had square-based pyramidal geometry. Antimicrobial testing showed that the metal complexes had higher activity than the free ligand, with the Co(II) complex being most active.
This document investigates the effect of exhaust gas recirculation (EGR) while adopting different air filters on the performance and emissions of a diesel engine. Experiments were conducted on a single cylinder diesel engine running with various air filters (AFM1-AFM4) at different EGR levels of 5%, 10%, and 15%. The performance parameters such as brake thermal efficiency and emissions such as CO, CO2, NOx, UBHC, O2, and smoke were measured and the results are presented and discussed. The findings show that brake thermal efficiency decreased with increasing EGR levels for all air filters. EGR is found to be effective in reducing NOx emissions but increases CO and UHC emissions.
The document presents a computer model for assessing the effect of suction-line heat exchangers (SLHXs) on the performance of alternative refrigerants to R-22. The model is validated by comparing its results to previous analyses that used REFPROP and CoolPack software. The model is then used to analyze the performance of six refrigerants - R-134a, R-152a, R-407C, R-410A, R-290, and R-600a - at different subcooling degrees from 2 to 10°C. The results show that R-152a, R-407C, and R-600a are suitable alternatives to R-22.
Combination of Cubic and Quartic Plane CurveIOSR Journals
The document discusses various types of plane quartic curves defined by cubic and quartic equations, including:
- The bicorn curve, which has two cusps and is symmetric about the y-axis.
- The Klein quartic, which has the highest possible order automorphism group for its genus.
- The bullet-nose curve, which has three double points and three inflection points.
- The lemniscate of Bernoulli, which resembles the numeral 8 and has a double point at the origin.
- The Cartesian oval, which is the set of points with a linear combination of distances from two fixed points.
- The deltoid curve, which resembles the Greek letter delta
This document proposes a system for identifying, tracking, and controlling car theft using a GPS module, Android mobile phone, and control system. If the car is stolen, the owner will receive an MMS with an image of the thief captured by a hidden camera and SMS messages with the car's latitude and longitude. The owner can then send a secret code by SMS to stop the car remotely via a microcontroller. Principal component analysis is used for face recognition to identify thieves. The low-cost system aims to provide reliable vehicle security and assist investigators in identifying hijackers.
This document provides a review of synthetic aperture radar (SAR) engineering. It begins with an introduction to SAR and its uses in remote sensing and defense. It then discusses designs for SAR systems and antennas. The document reviews recent literature on SAR, including works discussing antenna mask design to optimize SAR performance, polarimetric SAR for mapping terrain changes, and using SAR to monitor cryospheric regions. It concludes that SAR is a useful technique for achieving good image quality through optimized antenna design.
High Performance Error Detection with Different Set Cyclic Codes for Memory A...IOSR Journals
The document presents a proposed error detection method using majority logic decoding with difference set cyclic codes. The proposed method can detect up to five bit errors in the first three decoding cycles, improving performance over traditional majority logic decoding approaches. It uses a control unit to evaluate parity check sums over the first three cycles, and can detect errors without fully decoding the codeword when no errors are found. This reduces decoding time compared to approaches that fully decode each codeword. The proposed method is also less complex than alternatives using syndrome calculation for error detection. Simulation results showed the proposed method can detect errors faster while using less memory and power than traditional approaches.
This document describes a software design approach for developing secure data management applications using model-driven development. It involves modeling an application's conceptual model, security model, and graphical user interface model. A model transformation lifts security policies from the security model to the GUI model. The models are validated for correctness before code generation. The approach was implemented in a tool called Sculpture, which was used to develop three secure web applications: a volunteer management app, electronic health record app, and meal service management app. The approach aims to improve on previous work by providing more expressive modeling languages, validation of models, and automated generation of secure multi-tier applications.
This document describes the modeling and simulation of the transfer function characteristics of an RLC circuit using MATLAB/GUI. It begins with an introduction to RLC circuits and their importance. It then provides theoretical background on transfer functions, series RLC circuits, and step responses. The document proceeds to describe the development of a MATLAB graphical user interface to model and simulate an RLC circuit. It provides examples of simulations using different component values and discusses the results. Validation of the simulator is also presented by comparing results from the GUI simulator to manual calculations. The conclusion is that the GUI simulator allows for easy understanding and analysis of RLC circuit behavior as components values vary.
This document summarizes a research study that analyzed the performance of students working on different chairs and tables of varying heights. Two students of different heights assembled and disassembled a toy car on five tables with rotations of five chairs. The time taken was observed and production rates were calculated and compared. The results showed that the taller student was more comfortable and efficient with the given chair-table combinations. Ergonomics aims to design workspaces that balance worker characteristics and task demands to enhance productivity, safety, and well-being. Consideration of anthropometrics and posture is important for office furniture to properly fit its users.
This document discusses improving quality of service in OFDMA relay networks through retransmission. It analyzes two models for OFDMA transmission - distributed permutation and contiguous permutation. It evaluates the performance of two scheduling algorithms (linear programming and greedy) on these models to select the best one. Packet loss is detected using synchronization techniques, and retransmission is used to improve throughput by resending lost packets. The goal is to enhance performance of OFDMA-based relay networks for next-generation cellular standards.
This document summarizes a numerical simulation of ventilation systems in the archaeological tomb of Horemheb in the Valley of the Kings in Luxor, Egypt. The study used computational fluid dynamics to model airflow patterns, temperature, and relative humidity within the tomb under different ventilation system designs and numbers of visitors. The results showed that mechanical ventilation helped maintain temperatures around 305K and relative humidity below 70% within recommended comfort levels. Peak humidity occurred in winter months, so limiting visits then was suggested. Air velocity was kept below 0.12 m/s within the tomb to prevent wall painting erosion.
A study to Design and comparison of Full Adder using Various TechniquesIOSR Journals
Abstract: Adders is widely used in applications such as digital signal processing (DSP) and microprocessors. In this paper Half adders are simulated and analyzed based on power dissipation, area and speed on 90nm technology using Microwind and Dsch tool. Half Adder is the basic building block in Parallel Feedback Carry Adder (PFCA). Keywords: Full adder, Half adder, PFCA, VLSI
This document summarizes a study on traffic safety and the public transport system in Hyderabad, India. It finds that buses are involved in approximately 12% of fatal crashes in Hyderabad. Low-floor buses with mechanical doors and segregated lanes for pedestrians and bicyclists could significantly reduce fatal crashes involving buses and vulnerable road users. The study analyzed traffic fatality data in Hyderabad and other major Indian cities and found that buses, pedestrians, bicyclists, and motorcyclists account for the majority of road fatalities.
This document summarizes an experimental study on controlling base pressure in a suddenly expanded flow using micro jets. The study varied the area ratio of the enlarged duct, the length to diameter ratio of the duct from 10 to 1, and nozzle pressure ratios from 1.5 to 3.0. Micro jets located around the base region were used for active control. Results found that micro jets were effective at increasing base pressure and did not disturb the wall pressure distribution. For length to diameter ratios from 4 to 2, oscillations in pressure were observed at nozzle pressure ratios of 2.5 to 3.0, but these were reduced by increasing the length to diameter ratio or decreasing the nozzle pressure ratio. The micro jets provided effective control of base pressure under
This document summarizes a study on optimizing and reducing the weight of a universal joint yoke through the use of composite materials. The study first analyzes a conventional universal joint yoke made of SM45C steel using finite element analysis. It then models modified universal joint yokes made of carbon/epoxy composite and Kevlar/epoxy composite. Calculations of torsional strength, buckling strength, and bending natural frequency show that both composite designs meet requirements while reducing weight compared to steel. Static stress analyses and modal analyses using FEA are presented and compared between materials. The study aims to improve mechanical properties and reduce weight of universal joints through composite material optimization.
Traditional use of Monocotyledon Plants of Arakuvalley Mandalam, Visakhapatna...IOSR Journals
An ethno-medico botanical survey of plants used in the treatment of different type of diseases of Arakuvalley Mandalam, Visakhapatnam district, Andhra Pradesh was conducted. The information was collected on the basis of personal interviews with traditional healers, tribal doctors and old women of the society. The investigation revealed that 34 Monocotyledon plant species belonging to 10 families and 28 genera are commonly used in the treatment of varies ailments
The document summarizes a study on gain flattening of a hybrid optical amplifier for a 64×20Gbps dense wavelength division multiplexing system using hybrid optical amplifiers. The hybrid amplifier combines an erbium doped fiber amplifier and a Raman amplifier. The system was simulated with 64 channels spaced at 12GHz between 185-185THz. The hybrid amplifier provided a maximum gain of 21.7dB with a gain flatness of 2.5dB. Varying the input pump power, a maximum gain of 13.06dB was observed at -26dB pump power. The hybrid amplifier design achieved high gain and gain flatness suitable for dense wavelength division multiplexing systems.
This document describes a microcontroller-based touch switch system using an ATMega8 microcontroller chip. The system allows multiple touch switches to be added digitally and at low cost compared to analog switches. When a touch point is pressed, the microcontroller detects the input signal, turns on the load by controlling a relay, and when pressed again turns off the load. The system provides a safe and reliable switching method that can be used for household applications and to control loads from a distance.
This document summarizes a research paper that proposes and evaluates a novel interleaved ZCS boost DC-DC converter topology for photovoltaic interfaces. The converter uses two quasi-resonant switch blocks and lossless snubbers to achieve soft switching. Simulation results show the converter achieves reduced voltage and current ripple compared to conventional designs. A dual loop control scheme with an outer voltage loop and inner current loop is used to regulate the output. Coupling inductors between converter cells further improve transient response and reduce ripple. The proposed converter design and control scheme effectively interfaces photovoltaic systems with loads.
This document presents the conceptual design of a new "Lotos" motorcar. The design was inspired by the shape of lotus flower petals and aims to emulate their graceful yet powerful form. The conceptual design process began with sketches of potential shapes and symbols. A 3D computer model was then developed using polygonal extrusion in 3ds Max software. Various design elements were smoothed and given materials. Renderings were produced using V-Ray to visualize the final shaded conceptual model. The goal of the conceptual design was to create a high-performance sports car with the elegance and vigor suggested by its namesake, the lotus flower.
This document summarizes a study on the leaching behavior of cobaltous oxide (CoO) and cobalto-cobaltic oxide (Co3O4) in ammonia and acid solutions. The dissolution of cobaltous oxide was found to be chemically controlled, with apparent activation energies of 54.0 kJ/mol and 56.5 kJ/mol in ammonia and acid solutions, respectively. The dissolution rate of cobalto-cobaltic oxide in ammonia-ammonium carbonate was very slow at low temperatures. At higher temperatures, less than 2 x 10-5 mol/dm3 of cobalt remained in solution due to precipitation of cobalt carbonate and cobalto-cobalt
The document describes the synthesis of Schiff base ligands derived from citral and valine and their complexes with Cu(II), Ni(II), and Co(II). The structures of the complexes were characterized using IR, UV-vis, and magnetic susceptibility measurements. The Cu(II) and Ni(II) complexes were proposed to have distorted octahedral geometry while the Co(II) complex had square-based pyramidal geometry. Antimicrobial testing showed that the metal complexes had higher activity than the free ligand, with the Co(II) complex being most active.
This document summarizes a study that developed a new hybrid electrocatalyst for oxygen evolution reaction (OER) by anchoring cobalt oxide (Co3O4) nanoparticles onto titanium carbide (Ti3C2) MXene nanosheets. The Co3O4/MXene hybrid (denoted CM) was synthesized using a solvothermal method. Characterization showed uniform distribution of small Co3O4 nanoparticles on MXene nanosheets. Electrochemical tests found the CM catalyst achieved overpotential of 300 mV at 10 mA/cm2 for OER, which was lower than Co3O4 or MXene alone. The enhanced performance was attributed to strong interactions and charge transfer between
Research Inventy : International Journal of Engineering and Scienceresearchinventy
This document summarizes a research study on the thermoluminescence properties of nanocrystalline europium-doped barium sulfate (BaSO4:Eu) phosphor. Key findings include:
1) Nanocrystalline BaSO4:Eu powder was successfully synthesized via a chemical co-precipitation technique and characterized using XRD and TEM analysis.
2) TL measurements showed a single prominent dosimetric peak around 456 K, above room temperature, making the material suitable for radiation dosimetry.
3) The material exhibited a linear dose response up to 100 Gy. Deconvolution of the TL glow curve identified two trap centers responsible for the observed luminescence
- The document reports on the synthesis and characterization of Schiff base ligands derived from L-valine and their Cu(II), Ni(II), and Co(II) complexes.
- Spectroscopic data revealed that the ligands bind as tridentate in the Cu(II) and Ni(II) complexes and bidentate in the Co(II) complex.
- Magnetic susceptibility measurements showed the complexes have a bimetallic structure with antiferromagnetic interactions.
- Antimicrobial testing found the metal complexes to have greater activity than the free ligand, with the Co(II) complex exhibiting the strongest effects.
MXene supported CoxAy (A ¼ OH, P, Se), first OER-converted.docxJamimtiaz3
This document describes a study investigating MXene-supported cobalt phosphide (CoP) and cobalt selenide (Co7Se8) electrocatalysts for overall water splitting. Large, exfoliated MXene sheets provide a conductive support for CoP and Co7Se8, enhancing electrocatalytic performance. CoP/MXene shows high oxygen evolution reaction activity with low overpotential. A CoP/MXene//CoP/MXene bifunctional electrode demonstrates highly stable and efficient overall water splitting, outperforming an IrO2/C//Pt/C benchmark. The role of anion oxidation in catalyst activity and stability is explored, finding surface oxidation of CoP/MX
The document summarizes research on using external electric fields to enhance the catalytic performance of nickel for methane steam reforming. Key findings include:
1) Computational and experimental results show that a positive electric field can suppress the formation of coke on nickel catalysts by up to 96% by increasing the activation energy of the rate-limiting CH dissociation step.
2) Both theoretical calculations and experimental XPS data indicate that a positive electric field strengthens the adsorption of water on nickel surfaces, increasing water coverage by up to 35.2%.
3) The application of electric fields is found to alter the reaction intermediates and pathways of the overall methane steam reforming process on nickel, potentially enabling lower
Catalysis plays a key role in many chemical industries and biochemical reactions. A catalyst reduces the activation energy of a reaction, accelerating its rate without being consumed. There are two main types: homogeneous catalysis where reactants and catalysts are in the same phase, and heterogeneous catalysis where they are in different phases. Enzymes are protein catalysts that allow biochemical reactions to occur efficiently in living systems. Michaelis-Menten kinetics describe how enzyme activity depends on substrate concentration.
This document summarizes literature on iron catalysts used for ammonia synthesis. Key points include:
- Iron catalysts promoted with aluminum and potassium oxides are most effective for ammonia synthesis.
- The (111) and (211) crystal planes of iron are the most active surfaces due to the presence of highly coordinated C7 sites.
- Dissociative adsorption of nitrogen is generally the rate-determining step in ammonia synthesis.
- Promoters like potassium increase the rate by altering intermediate concentrations and stabilizing particle size.
- Studies using techniques like AES, LEED and TPD provide information on surface structures and reaction mechanisms.
Complexes of m(ii)sulphates with 4 cyanobenzaldehyde andAlexander Decker
This document describes the synthesis and characterization of ten complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) sulphates with two organic ligands, 4-cynobenzaldehydecyclopropanecarboxylicacidhydrazone (CBHN) and 4-ethylbenzaldehydecyclopropanecarboxylicacidhydrazones (EBHN). The complexes were characterized using techniques such as melting point determination, IR spectroscopy, elemental analysis, conductivity measurements, and electronic spectroscopy. IR data showed that the ligands coordinate to the metal ions through the carbonyl oxygen and azomethine nitrogen. Electronic spectroscopy indicated octahedral geometry for most complexes except for
Complexes of m(ii)sulphates with 4 cyanobenzaldehyde andAlexander Decker
This document describes the synthesis and characterization of ten complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) sulphates with two organic ligands, 4-cynobenzaldehydecyclopropanecarboxylicacidhydrazone (CBHN) and 4-ethylbenzaldehydecyclopropanecarboxylicacidhydrazones (EBHN). The complexes were characterized using techniques such as melting point determination, IR spectroscopy, elemental analysis, molar conductivity measurements, and electronic spectroscopy. IR data showed that the ligands coordinate to the metal ions through the carbonyl oxygen and azomethine nitrogen. Electronic spectra indicate octahedral geometry for most complexes
This document discusses a study of the kinetics of self-reducing mixtures composed of iron ore, steel mill waste (BOF dust), and biomass from elephant grass. Kinetic runs were performed using thermogravimetric analysis at temperatures from 900-1100°C and carbon contents of 15-30%. The reaction fractions over time showed good agreement with first-order kinetics. Activation energies were estimated, with the highest kinetic constants occurring at 1100°C with 30% carbon: 0.0037 s-1 for the Fe3O4→FeO reaction and 0.0258 s-1 for FeO→Fe. The kinetic behavior supported chemical reaction control over diffusion control for self-reducing pellet reactions.
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.
Electrochemical properties of myoglobin deposited on multi walled carbon nano...Expand_Lives
We report the direct electrochemical and electrocatalytic properties of myoglobin (MB) on a multi-walled
carbon nanotube/ciprofloxacin (MWCNT/CF) film-modified electrode. A highly homogeneous MWCNT
thin-film was prepared on an electrode surface using ciprofloxacin (CF) as a dispersing agent. MB was
then electrochemically deposited onto the MWCNT/CF-modified electrode. The MB/MWCNT/CF film was
characterized by scanning electron microscopy and UV–visible spectroscopy (UV–vis). UV–vis spectra
confirmed that MB retained its original state on the MWCNT/CF film. Direct electrochemical properties of MB on the MWCNT/CF film were investigated by cyclic voltammetry. The formal potential and
electron transfer rate constant were evaluated in pH 7.2 buffer solution as−0.327 V and 300 s
−1
, respectively. In addition, the MB/MWCNT/CF-modified electrode showed excellent electrocatalytic properties
for the reduction of hydrogen peroxide (H2O2). The MB/MWCNT/CF-modified electrode was used for the
detection of H2O2at concentrations from 1×10
−6
Mto7×10
−4
M in pH 7.2 buffer solution. Overall, the
MB/MWCNT/CF-modified electrode was very stable and has potential for development as a H2O2sensor.
The document discusses kinetics and the rate law for the decolorization of crystal violet. It describes using a spectroscopic colorimeter to monitor the concentration of crystal violet over time as it reacts with sodium hydroxide. The goals are to determine the overall rate law and rate constant k for the decolorization reaction. Experiments are conducted at different concentrations and the orders are determined by analyzing linear regression graphs of integrated rate laws versus time and concentration. The 1st order graph provided the best correlation, indicating the reaction is first order with respect to crystal violet concentration.
This document reports on a conductometric study of several 1-1 electrolytes (potassium thiocyanate, ammonium thiocyanate, sodium nitrate, ammonium nitrate) in the solvent 2-ethoxyethanol. Precise conductivity measurements were made at various temperatures. The data were analyzed using the 1978 Fuoss conductance equation to determine limiting molar conductivity, association constant, and cosphere diameter. Strong ion association was found for all electrolytes. The cations were substantially solvated by 2-ethoxyethanol while the anions had only weak interaction with the solvent molecules.
Impedance Spectroscopy Analysis of a Liquid Tin Anode Fuel Cell in Voltage Re...AEIJjournal2
A concept of a liquid tin anode-indirect carbon air fuel cell (LTA-ICFC) are described. Experimental
setups for analysis of LTA-ICFC polarisations of an operational electrochemical reactor of the LTA-ICFC
are presented. Results from Electrochemical Impedance Spectroscopy (EIS) Analysis of the electrochemical
reactor of the LTA-ICFC are shown and analysed.The rate-determining step of the system is concluded.
The charge-transfer resistance did not show considerable differences at 700-800 °C. This can be implied
that the charge-transfer resistance is not the rate-limiting step of the transport processes of the fuel cell.
The increase of the Warburg impedance concurrently with the resistance to fit mass-transport loss (R3)
suggests that the rate-limiting step for the LTA-ICFC in voltage recovery mode is the diffusion of the oxide
ions through SnO2 layer. The increment of mass transport lost, R3, of the cell causes the slowly increase of
the cell’s voltage over the voltage from 0.7-0.8 V at 700, 750, and 800 °C.
IMPEDANCE SPECTROSCOPY ANALYSIS OF A LIQUID TIN ANODE FUEL CELL IN VOLTAGE RE...AEIJjournal2
A concept of a liquid tin anode-indirect carbon air fuel cell (LTA-ICFC) are described. Experimental
setups for analysis of LTA-ICFC polarisations of an operational electrochemical reactor of the LTA-ICFC
are presented. Results from Electrochemical Impedance Spectroscopy (EIS) Analysis of the electrochemical
reactor of the LTA-ICFC are shown and analysed.The rate-determining step of the system is concluded.
The charge-transfer resistance did not show considerable differences at 700-800 °C. This can be implied
that the charge-transfer resistance is not the rate-limiting step of the transport processes of the fuel cell.
The increase of the Warburg impedance concurrently with the resistance to fit mass-transport loss (R3)
suggests that the rate-limiting step for the LTA-ICFC in voltage recovery mode is the diffusion of the oxide
ions through SnO2 layer. The increment of mass transport lost, R3, of the cell causes the slowly increase of
the cell’s voltage over the voltage from 0.7-0.8 V at 700, 750, and 800 °C.
Impedance Spectroscopy Analysis of a Liquid Tin Anode Fuel Cell in Voltage Re...AEIJjournal2
A concept of a liquid tin anode-indirect carbon air fuel cell (LTA-ICFC) are described. Experimental
setups for analysis of LTA-ICFC polarisations of an operational electrochemical reactor of the LTA-ICFC
are presented. Results from Electrochemical Impedance Spectroscopy (EIS) Analysis of the electrochemical
reactor of the LTA-ICFC are shown and analysed.The rate-determining step of the system is concluded.
The charge-transfer resistance did not show considerable differences at 700-800 °C. This can be implied
that the charge-transfer resistance is not the rate-limiting step of the transport processes of the fuel cell.
The increase of the Warburg impedance concurrently with the resistance to fit mass-transport loss (R3)
suggests that the rate-limiting step for the LTA-ICFC in voltage recovery mode is the diffusion of the oxide
ions through SnO2 layer. The increment of mass transport lost, R3, of the cell causes the slowly increase of
the cell’s voltage over the voltage from 0.7-0.8 V at 700, 750, and 800 °C.
IMPEDANCE SPECTROSCOPY ANALYSIS OF A LIQUID TIN ANODE FUEL CELL IN VOLTAGE RE...AEIJ journal
A concept of a liquid tin anode-indirect carbon air fuel cell (LTA-ICFC) are described. Experimental setups for analysis of LTA-ICFC polarisations of an operational electrochemical reactor of the LTA-ICFC are presented. Results from Electrochemical Impedance Spectroscopy (EIS) Analysis of the electrochemical reactor of the LTA-ICFC are shown and analysed.The rate-determining step of the system is concluded. The charge-transfer resistance did not show considerable differences at 700-800 °C. This can be implied
that the charge-transfer resistance is not the rate-limiting step of the transport processes of the fuel cell.The increase of the Warburg impedance concurrently with the resistance to fit mass-transport loss (R3) suggests that the rate-limiting step for the LTA-ICFC in voltage recovery mode is the diffusion of the oxide
ions through SnO2 layer. The increment of mass transport lost, R3, of the cell causes the slowly increase of the cell’s voltage over the voltage from 0.7-0.8 V at 700, 750, and 800 °C.
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.
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NIMA2024 | De toegevoegde waarde van DEI en ESG in campagnes | Nathalie Lam |...BBPMedia1
Nathalie zal delen hoe DEI en ESG een fundamentele rol kunnen spelen in je merkstrategie en je de juiste aansluiting kan creëren met je doelgroep. Door middel van voorbeelden en simpele handvatten toont ze hoe dit in jouw organisatie toegepast kan worden.
How are Lilac French Bulldogs Beauty Charming the World and Capturing Hearts....Lacey Max
“After being the most listed dog breed in the United States for 31
years in a row, the Labrador Retriever has dropped to second place
in the American Kennel Club's annual survey of the country's most
popular canines. The French Bulldog is the new top dog in the
United States as of 2022. The stylish puppy has ascended the
rankings in rapid time despite having health concerns and limited
color choices.”
Unveiling the Dynamic Personalities, Key Dates, and Horoscope Insights: Gemin...my Pandit
Explore the fascinating world of the Gemini Zodiac Sign. Discover the unique personality traits, key dates, and horoscope insights of Gemini individuals. Learn how their sociable, communicative nature and boundless curiosity make them the dynamic explorers of the zodiac. Dive into the duality of the Gemini sign and understand their intellectual and adventurous spirit.
The Steadfast and Reliable Bull: Taurus Zodiac Signmy Pandit
Explore the steadfast and reliable nature of the Taurus Zodiac Sign. Discover the personality traits, key dates, and horoscope insights that define the determined and practical Taurus, and learn how their grounded nature makes them the anchor of the zodiac.
Cover Story - China's Investment Leader - Dr. Alyce SUmsthrill
In World Expo 2010 Shanghai – the most visited Expo in the World History
https://www.britannica.com/event/Expo-Shanghai-2010
China’s official organizer of the Expo, CCPIT (China Council for the Promotion of International Trade https://en.ccpit.org/) has chosen Dr. Alyce Su as the Cover Person with Cover Story, in the Expo’s official magazine distributed throughout the Expo, showcasing China’s New Generation of Leaders to the World.
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AI Transformation Playbook: Thinking AI-First for Your BusinessArijit Dutta
I dive into how businesses can stay competitive by integrating AI into their core processes. From identifying the right approach to building collaborative teams and recognizing common pitfalls, this guide has got you covered. AI transformation is a journey, and this playbook is here to help you navigate it successfully.
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Part 2 Deep Dive: Navigating the 2024 Slowdownjeffkluth1
Introduction
The global retail industry has weathered numerous storms, with the financial crisis of 2008 serving as a poignant reminder of the sector's resilience and adaptability. However, as we navigate the complex landscape of 2024, retailers face a unique set of challenges that demand innovative strategies and a fundamental shift in mindset. This white paper contrasts the impact of the 2008 recession on the retail sector with the current headwinds retailers are grappling with, while offering a comprehensive roadmap for success in this new paradigm.
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1. IOSR Journal of Applied Chemistry (IOSR-JAC)
e-ISSN: 2278-5736. Volume 4, Issue 1 (Mar. – Apr. 2013), PP 01-04
www.iosrjournals.org
Simultaneous Heating and Stirring by Magnetic Induction for
Mixing of Carboxylic Acid Components and Hence Preparation
of Binary Eutectic Mixtures
Sandeep Sharma1, Alok Kumar2, Vijendra Singh3
1, 2,3
Department of Chemistry;CCS University, Meerut (UP).
Abstract: Eutectic Mixtures had lowest possible melting point, so, their freezing point would also be lowest
possible. In this way Eutectic Mixture had melting point/freezing point more close to room temperature as
compared to their other compositions. This property of the eutectic mixtures as to get easily freeze did not allow
the proper and uniform mixing of the components because when molten mixtures were stirred by stopping the
supply of heat, they started freezing quickly, so, to made proper mixing to get exact melting point in an accurate
and fast way, we applied magnetic induction heating method. This method provided simultaneous heating and
stirring of the given mixture, which was energy saving, accurate and fast as well. In some acid-acid mixtures
with their randomly selected compositions, simultaneous heating and stirring was performed, as a result it was
found that the melting points were same every time and it was un-needed to take average of different melting
points, as were obtained in earlier melting and then stirring techniques. As melting was proportional to high
frequency and intensity of stirring was proportional to low frequency, so, providing multi-phase ac current, first
at high frequency and then at low frequency the simultaneous melting and stirring was performed to achieve
proper and uniform mixing of the acid-acid mixtures.
Keywords: Eutectic Mixture, Induction Heating, Multi-Phase AC Current.
I. Introduction
When we tried to prepare different compositions of two different carboxylic acids then their mixing by
heating those particular acid components could just be achieved by heating first and then manual stirring of that
molten mixture of acid-acid components 1-2. The main problem arose when particular composition appeared to
be “Eutectic Mixture”, at that stage the mixture had minimum melting point and hence minimum freezing point,
so, when this composition of eutectic mixture was heated then molten was obtained very easily but when the
heating was stopped it started freezing with the same fast speed and ease, in this way the stirring of this eutectic
mixture could not be done in a proper manner. If the molten form of eutectic mixture was further heated just to
mix them properly then this additional heating could lead to decomposition of the mixture or even their
magnetic or biological properties could be lost e.g. Malonic Acid suddenly decomposed after its melting point
was reached3. Moreover, the continue supply of heat energy just to keep the mixture in the molten state to
achieve uniform stirring was also an energy- wasting technique.
So it would be better if we stir the components of eutectic mixture while heating/melting of it. In this
regard we had opted magnetic induction heating for the stirring and mixing of the two components of different
compositions. It was the magnetic induction heating which could provide both heating and stirring
simultaneously to form the uniformly mixed compositions. When single phase ac current was supplied then only
heating was obtained but when multi-phase (Three-Phase) ac current was supplied then both heating and stirring
could be achieved simultaneously. The frequency for providing simple heating was higher and frequency
required for stirring was always lower than the frequency required for heating4-7.
If the given acid-acid composition was prepared by simple heating/melting followed by stirring then
the mixing could not come out to be proper and uniform. It could be verified from difference in melting points
of the same compositions in each melting point determination. Usually, average of three different melting points
was taken. To solve this problem when we used simultaneous heating and stirring by magnetic induction for the
mixing of carboxylic acid components ; then in each determination the melting point came out to be same for
each composition (nevertheless condition of minimum human error is advised). This confirmed the proper and
uniform mixing of acid- acid components in a single course of action. The other most important benefit of this
method was that in normal heating/melting process heat was first of all supplied from the source to the container
and then from the container to that substance which was to be melted, however, in magnetic induction heating
method that particular container acted as the source of heat and in this way heat loss was minimized i.e. energy
was saved.
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2. Simultaneous Heating and Stirring by Magnetic Induction for Mixing of Carboxylic Acid Component
Fig.(1)
The combined action of the magnetic field and the electric currents creates electro-magnetic forces which raise the metal temperature and
stir the melted metal. Magnetic materials naturally offer electrical resistance to the rapidly changing magnetic fields within the
inductor. This resistance produces internal friction which in turn produces heat.
When an electric current j(x, t) flows through a conducting body, whether solid or fluid, in the presence of a
magnetic field B( x , t ), there is a force per unit volume ( Lorentz force)
F=j×B … (1)
That acts upon the conductor. In general, this force is rotational i.e. curl F. If the conductor is fluid, it cannot be
compensated by a pressure gradient. In these circumstances, the fluid must move in response to the force. This,
in its simplest terms, is the principle of electromagnetic stirring8-11.
II. Experimental
TASK-I: Preparation of Different Acid-Acid Mixtures With Varying Compositions:
We had taken different acid-acid mixtures with varying compositions so that melting point of
different mixtures could be tested at different random compositions with the help of melting point apparatus.
TASK-II: Heating/Melting and Stirring by Providing Multi-Phase AC Current:
As multi-phase ac current provides simultaneous melting and stirring, so it had been used for the
proper and uniform mixing of both the acid- acid components. In this process the container used for melting the
given mixture should be ferromagnetic in nature like steel or iron. Resistivity of steel is higher due to the
presence of tungsten and carbon in it, this high resistivity provides more heating of steel, that‟s why steel
container was used. With increase in temperature resistivity increased and hence more heating was observed at
high temperature.
TASK-III: To Determine The Melting Point of Different Acid-Acid Mixtures With Varying
Composition:
Variable compositions were selected just to make it sure that for every composition, if uniform mixing was done
then every time same melting point was obtained, which is shown in tables (1) to (4):
Malonic Acid-Benzoic Acid:
Sr. No. COMPOSITION MELTING POINT MELTING POINT MELTING POPINT
(K) (K) (K)
(1) (2) (3)
1. 1:9 389.66 389.66 389.66
2. 9:1 395.16 395.16 395.16
Table (1)
Succinic Acid-Benzoic Acid:
Sr. No. COMPOSITION MELTING POINT MELTING POINT MELTING POPINT
(K) (K) (K)
(1) (2) (3)
1. 1:4 390.66 390.66 390.66
2. 4:1 444.66 444.66 444.66
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3. Simultaneous Heating and Stirring by Magnetic Induction for Mixing of Carboxylic Acid Component
Table (2)
O-Salicylic Acid-Benzoic Acid:
Sr. No. COMPOSITION MELTING POINT MELTING POINT MELTING POPINT
(K) (K) (K)
(1) (2) (3)
1. 2:3 394.16 394.16 394.16
2. 3:2 411.16 411.16 411.16
Table (3)
OxalicAcid-Benzoic Acid:
Sr. No. COMPOSITION MELTING POINT MELTING POINT MELTING POPINT
(K) (K) (K)
(1) (2) (3)
1. 5:5 388.66 388.66 388.66
Table (4)
So, every different acid-acid mixture with randomly selected composition was simultaneously melted and stirred
for uniform mixing due to which each time we got same melting point which was not possible otherwise with
other conventional methods.
III. Results And Discussions
In normal conventional methods when first heating/melting and then stirring was provided, then on
each melting we used to get different melting point because in each melting some more mixing of the
components of the mixture took place, which gave rise to different interactions in the mixture and hence a new
melting point was observed but when same composition was uniformly mixed with simultaneous heating and
stirring by magnetic induction then every time we got the same melting point, which showed that
heating/melting first and then stirring could not provide a proper mixing due to which exact Eutectic Mixture
was not formed but simultaneous heating/melting could provide fast and proper mixing of the acid-acid
components. Hence this method was the best method for the preparation of Eutectic Mixture because in this
method, due to proper and uniform mixing of components there were uniform interactions throughout the
mixture and hence melting point came out to be same and more exact. So, mixing of acid-acid components by
simultaneous heating and stirring by magnetic induction was the fast, accurate and energy saving method for the
preparation of Eutectic Mixtures.
IV. Conclusion
If in a mixture its two components say „A‟ and „B‟ were not uniformly mixed then three different
types of interactions like A-A, B-B and A-B were present, each of these had its own melting point. Hence
melting point range was larger. However, on each melting some more mixing took place and we got different
melting point every next time. However when we provided the simultaneous heating and stirring then mixing
was almost completed, so, mainly one type of interactions (A-B) were present and on further heating/melting
again and again could not provide more uniform mixing and hence melting point came out to be same each time.
While concluding, we could say that if mixing of the two acid components were proper with simultaneous
heating and stirring by magnetic induction heating then their melting points were same each time. In this way
we could prepare Eutectic Mixtures of different components with more accuracy and certainty, moreover this
method was energy saving and fast as well.
References
[1] B.L. Sharma, N.K. Sharma,P.S. Bassi, Cryst. Res. Tekhnol, 18 (1983),peges 1191-1197.
[2] T.A. Mirnaya, A.P. Polishchuk, Y.V. Bereznitski, J. Chem. Eng. Data 1996, 41,pages 1337-1339.
[3] N. Weiner, "Malonic acid", Org. Synth.; Coll. Vol. 2: 376.
[4] S. Llorente, F. Monterde, J.M. Burdio, J. Acero, (2002). “A comparative study of resonant inverter topology used in induction
cookers”. 2009-05-20.
www.iosrjournals.org 3 | Page
4. Simultaneous Heating and Stirring by Magnetic Induction for Mixing of Carboxylic Acid Component
[5] W. C.Moreland, The Induction Range: Its Performance and Its Development Problems, IEEE Transactions on Industry Applications,
vol. TA-9, no. 1, January/February 1973 pages 81–86.
[6] Fairchild Semiconductors (2000-07). “Induction Heating System Topology Review”. 2009.
[7] V. Rudnev, Handbook of Induction Heating CRC Press, 2003, page 92. .
[8] H. K. Moffatt, Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge
CB39EW, England. 1990.
[9] S. Dong-Hwi ,E. Hyeju and P. Keun , Application of high-frequency induction heating to high-quality injection molding, in Plastics
Engineering Annual Techncial Confernce Proceedings ANTEC 2010, Society of Plastics Engineers, 2010.
[10] R. Fields, Restaurant Success by the Numbers: A Money-Guy's Guide to Opening the Next Hot Spot, Random House of Canada, 2007,
pages 144–145.
[11] H. Bach, D. Krause, Low thermal expansion glass ceramics, Springer, 2005,page 77.
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