Many properties of the use of paper are influenced by its surface quality. The surface quality can be measured
by different techniques. We aim to characterise its topography and the link between its structural
and physical properties.
Location Classification in Fractional Frequency Reuse (FFR)-based SystemsAjay Thampi
This document summarizes a presentation on using logistic regression to improve location classification in Fractional Frequency Reuse (FFR) systems. The presentation discusses how current FFR systems rely on a one-dimensional threshold like SINR to classify users as cell-center or cell-edge, which can result in misclassifications. It then proposes using logistic regression with received power and SINR as inputs to provide more accurate location classifications. Simulation results show the logistic regression approach achieves up to 87% accuracy in classifying locations, compared to only 67% for threshold-based approaches. This improved accuracy is expected to enhance overall system performance for FFR networks.
Damage detection in cfrp plates by means of numerical modeling of lamb waves ...eSAT Journals
Abstract
The paper presents an application of modeling acoustic waves propagation in a carbon fiber reinforced plastic (CFRP) plates for
damage detection. This task is a part of non-destructive testing (NDT) methods which are very important in many industry
branches. Propagation of Lamb waves is modeled using three-dimensional finite element method by means of commercial
software. In the paper three different cases of plate structures with and without flaws are considered to present review of selected
methods for the detection of defects in time and frequency domain. These are comparisons of: A-scans, B-scans, dispersion
curves, spectrograms, scalograms and energy plots. Developed numerical model first has been validated by means of analytical
solution for isotropic plate.
Keywords: Lamb waves, non-destructive testing, finite element method, damage detection
Raw 2009 -THE ROLE OF LATEST FIXATIONS ON ONGOING VISUAL SEARCH A MODEL TO E...Giacomo Veneri
The aim of the study is to understand the selection process, that modulates the exploration mechanism, during the execution of a high cognitively demanding task. The main purpose is to identify the mechanism competition mechanism between top-down and bottom-up. We developed an adaptive system trying to emulate this mechanism.
A topographical map uses contour lines to represent three-dimensional land features in two dimensions. It is important because it allows the viewer to understand locations of peaks, valleys, and other landforms, and whether travel will involve going uphill or downhill. Topographical maps are used by hikers, campers, engineers, soldiers, and others to understand elevation changes in an area. Contour lines called wiggly lines on the map indicate elevation, slope, and relief of the land.
A topographical map shows both natural and man-made features using contour lines and colors to represent elevation, terrain, and land use. Contour lines connect points of equal height and indicate the steepness of slopes. Common topographical map symbols and features include contour intervals, spot heights, settlements, drainage patterns, vegetation, infrastructure like roads and railroads, and land use patterns related to occupations. Topographical maps are scaled and use a grid system of eastings and northings to precisely locate points.
Disaster management involves preparing for, responding to, and recovering from disasters. A disaster is defined as any event that causes damage, loss of life, or deterioration of health beyond the capacity of local communities. Disaster nursing focuses on meeting physical and emotional needs resulting from disasters. Disasters can be natural or man-made, and affect communities in different ways depending on factors like speed of onset and duration. The phases of disaster management include preparedness, response, rehabilitation, and mitigation. Nurses play an important role in all phases through activities like community assessment, triage, disease surveillance, and psychological support.
Disaster management involves dealing with and avoiding both natural and man-made disasters through preparedness, response, recovery, and mitigation efforts. It aims to reduce vulnerabilities and impacts through organized and sustained actions to analyze and manage hazards and the underlying risks. Key aspects of disaster management include preparedness before a disaster through activities like risk assessment, warning systems, and stockpiling resources; immediate response efforts during an event; and long-term rehabilitation and reconstruction work after an event to support regrowth. Effective disaster management requires coordination and planning across different levels of government, organizations, and communities.
Location Classification in Fractional Frequency Reuse (FFR)-based SystemsAjay Thampi
This document summarizes a presentation on using logistic regression to improve location classification in Fractional Frequency Reuse (FFR) systems. The presentation discusses how current FFR systems rely on a one-dimensional threshold like SINR to classify users as cell-center or cell-edge, which can result in misclassifications. It then proposes using logistic regression with received power and SINR as inputs to provide more accurate location classifications. Simulation results show the logistic regression approach achieves up to 87% accuracy in classifying locations, compared to only 67% for threshold-based approaches. This improved accuracy is expected to enhance overall system performance for FFR networks.
Damage detection in cfrp plates by means of numerical modeling of lamb waves ...eSAT Journals
Abstract
The paper presents an application of modeling acoustic waves propagation in a carbon fiber reinforced plastic (CFRP) plates for
damage detection. This task is a part of non-destructive testing (NDT) methods which are very important in many industry
branches. Propagation of Lamb waves is modeled using three-dimensional finite element method by means of commercial
software. In the paper three different cases of plate structures with and without flaws are considered to present review of selected
methods for the detection of defects in time and frequency domain. These are comparisons of: A-scans, B-scans, dispersion
curves, spectrograms, scalograms and energy plots. Developed numerical model first has been validated by means of analytical
solution for isotropic plate.
Keywords: Lamb waves, non-destructive testing, finite element method, damage detection
Raw 2009 -THE ROLE OF LATEST FIXATIONS ON ONGOING VISUAL SEARCH A MODEL TO E...Giacomo Veneri
The aim of the study is to understand the selection process, that modulates the exploration mechanism, during the execution of a high cognitively demanding task. The main purpose is to identify the mechanism competition mechanism between top-down and bottom-up. We developed an adaptive system trying to emulate this mechanism.
A topographical map uses contour lines to represent three-dimensional land features in two dimensions. It is important because it allows the viewer to understand locations of peaks, valleys, and other landforms, and whether travel will involve going uphill or downhill. Topographical maps are used by hikers, campers, engineers, soldiers, and others to understand elevation changes in an area. Contour lines called wiggly lines on the map indicate elevation, slope, and relief of the land.
A topographical map shows both natural and man-made features using contour lines and colors to represent elevation, terrain, and land use. Contour lines connect points of equal height and indicate the steepness of slopes. Common topographical map symbols and features include contour intervals, spot heights, settlements, drainage patterns, vegetation, infrastructure like roads and railroads, and land use patterns related to occupations. Topographical maps are scaled and use a grid system of eastings and northings to precisely locate points.
Disaster management involves preparing for, responding to, and recovering from disasters. A disaster is defined as any event that causes damage, loss of life, or deterioration of health beyond the capacity of local communities. Disaster nursing focuses on meeting physical and emotional needs resulting from disasters. Disasters can be natural or man-made, and affect communities in different ways depending on factors like speed of onset and duration. The phases of disaster management include preparedness, response, rehabilitation, and mitigation. Nurses play an important role in all phases through activities like community assessment, triage, disease surveillance, and psychological support.
Disaster management involves dealing with and avoiding both natural and man-made disasters through preparedness, response, recovery, and mitigation efforts. It aims to reduce vulnerabilities and impacts through organized and sustained actions to analyze and manage hazards and the underlying risks. Key aspects of disaster management include preparedness before a disaster through activities like risk assessment, warning systems, and stockpiling resources; immediate response efforts during an event; and long-term rehabilitation and reconstruction work after an event to support regrowth. Effective disaster management requires coordination and planning across different levels of government, organizations, and communities.
The document discusses using polarimetry to characterize the surface properties of nanotechnology materials. Polarimetry measurements can provide information about surface roughness and periodic structures. Models are presented for using polarimetry to evaluate parameters like depolarization, entropy, and roughness for both random and periodic surfaces. Case studies are described applying these techniques to materials like aluminum films, silicon nanowires, and plastic films.
This document presents the design and investigation of a photonic crystal fiber (PCF) biosensor based on surface plasmon resonance (SPR). The proposed sensor aims to achieve higher sensitivity and a simpler structure compared to previous designs. It involves modeling a PCF structure with gold-coated holes using finite element analysis software. Parameters like hole diameter, gold thickness, and analyte refractive index are varied to optimize sensitivity. Simulation results show the proposed sensor achieves maximum amplitude sensitivity of 822 RIU-1, an improvement over previous designs. The simple structure makes it easy to fabricate.
This document is the diploma thesis of Jagannath Nandi submitted to the Czech Technical University in Prague. It investigates CFD simulation of flow and heat transfer from an impinging jet through a circular nozzle onto a flat plate. The thesis includes a literature review on experimental methods and data to validate the CFD model. It describes building 3D and 2D models in ANSYS Fluent and performing a grid independence study. Simulation results for constant and developed inlet velocity profiles at different Reynolds numbers and nozzle-plate distances are compared to experimental data. The thesis aims to evaluate the most accurate turbulence model for predicting heat transfer from the impinging jet.
Image De-noising on Strip Steel Surface Defect Using Improved Compressive Sen...TELKOMNIKA JOURNAL
De-noising for the strip steel surface defect image is conductive to the accurate detection of the strip steel
surface defects. In order to filter the Gaussian noise and salt and pepper noise of strip steel surface defect
images, an improved compressive sensing algorithm was applied to defect image de-noising in this paper.
First, the improved Regularized Orthogonal Matching Pursuit algorithm was described. Then, three typical
surface defects (scratch, scar, surface upwarping) images were selected as the experimental samples. Last,
detailed experimental tests were carried out to the strip steel surface defect image de-noising. Through
comparison and analysis of the test results, the Peak Signal to Noise Ratio value of the proposed algorithm
is higher compared with other traditional de-noising algorithm, and the running time of the proposed algorithm
is only26.6% of that of traditional Orthogonal Matching Pursuit algorithms. Therefore, it has better de-noising
effect and can meet the requirements of real-time image processing.
FusIon - On-Field Security and Privacy Preservation for IoT Edge Devices: Con...jamesinniss
FusIon - On-Field Security and Privacy Preservation for IoT Edge Devices: Concurrent Defense Against Multiple types of Hardware Trojan Attacks
Get more info here:
>>> https://bit.ly/38FXJav
Global Bilateral Symmetry Detection Using Multiscale Mirror HistogramsMohamed Elawady
M. ELAWADY, C. BARAT, C. DUCOTTET and P. COLANTONI
Laboratoire Hubert Curien, Saint-Etienne, FR
Conference "Advanced Concepts for Intelligent Vision Systems
" 2016
Design & simulation of dual band t shaped slot micro strip antenna for c-...eSAT Journals
This document describes the design and simulation of a dual band T-shaped microstrip patch antenna for C-band applications between 5.4GHz and 6.6GHz. The antenna was designed on an FR4 substrate using HFSS simulation software. Key results include return losses below -26dB, a voltage standing wave ratio below 1.2, gains between 2.7-4.8dB depending on frequency and substrate thickness, radiation efficiencies between 37-71%, and half power beamwidths of 60 degrees. The document analyzes the antenna performance parameters and field distributions at different operating frequencies and substrate thicknesses.
Image processing techniques applied for pitting corrosion analysiseSAT Journals
Abstract
In order to study the behavior of the early stage of pitting corrosion, an image analysis based on discrete wavelet packet transform
and fractals was used. Image feature parameters were extracted and analyzed to characterize the pitting corrosion development with
test time. It was found that the feature parameters: Shannon entropy, energy, fractal dimension and intercept increased with the test
time. Therefore the image processing techniques were promising and effective tools to analyze and detect the pitting corrosion.
Keywords: corrosion, pitting corrosion, surface topography, surface analysis, carbon steel, tap water
Terahertz Microstrip Patch Antenna Design for detection of Plastic Explosive ...IRJET Journal
This document describes the design and simulation of a terahertz microstrip patch antenna for detecting the plastic explosive SEMTEX. The antenna is designed using FR4 as the substrate material with a thickness of 1.62 μm and dielectric constant of 4.4. Copper is used for the radiating patch and ground plane. Computer Simulation Technology (CST) Microwave Studio is used to simulate the antenna. The results show the antenna resonates at 4.32 THz with a return loss of -52.10 dB, gain of 5.88 dB, directivity of 5.75 dBi, and input impedance of 49.15 Ω, making it suitable for detecting SEMTEX.
Advances in fatigue and fracture mechanics by grzegorz (greg) glinkaJulio Banks
Professor Grzegorz (Greg) Glinka has made substantial contributions to the field of stress concentration evaluation using linear FEA results using the ESED (Equivalent Striain Energy Density). ESED aka Glinka methods allows the determination of strain-stress state at a point of local concentration by equating the strain energy from the linear FEA area in the material strain-stress curve to that of the actual strain-stress of the material using a models such as Ramberg-Osgood. The ESED method is more accurate than the Neuber requiring the equating of SED (Strain Energy Densities) of linear FEA results that Stress is proportional to strain even when the FEA predicts a stress greater than the ultimate strength of the material. One easy method of remember when to use ESED versus Neuber is that ESED, more accurate, should be use on the stress analysis of rocket structures and Neuber delegated to aerospace engines and components.
Statistical Modelling of ft to Process Parameters in 30 NM Gate Length FinfetsVLSICS Design
This paper investigates the effect of process variations on unity gain frequency (ft) in 30 nm gate length FinFET by performing extensive TCAD simulations. Six different geometrical parameters, channel doping, source/drain doping and gate electrode work function are studied for their sensitivity on ft
. It is found that ft is more sensitive to gate length, underlap, gate-oxide thickness, channel and Source/Drain doping and less sensitive to source/drain width and length, and work function variations. Statistical modelling has been performed for ft through design of experiment with respect to sensitive parameters. The model has been validated through a comparison between random set of experimental data simulations and predicted values obtained from the model.
This document summarizes a thesis that studied the seismic performance of perforated steel plate shear walls (P-SPSWs) designed according to Canadian seismic provisions. Finite element models were developed and analyzed using nonlinear time history analysis to evaluate response parameters of 4-, 8-, and 12-story P-SPSWs. Results showed that dynamic base shear was significantly higher than static design values. Dynamic storey shear in the perforated infill plates agreed reasonably well with code equations. Infill plates yielded fully at peak accelerations for some earthquakes, while boundary members remained elastic.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Field Strength Predicting Outdoor ModelsIRJET Journal
This document discusses several outdoor propagation models used to predict radio signal strength and path loss over distance. It begins by introducing concepts of transmission power, signal strength, and path loss. It then describes common factors that affect outdoor radio propagation like diffraction, reflection, refraction, and scattering. The rest of the document summarizes several empirical, theoretical, and physical propagation models including Okumura, Hata, ECC-33, COST-231 Hata, and Egli models. These models use different methods and equations to predict path loss and were developed based on extensive radio signal measurement data in various outdoor environments.
An Evolutionary Method for Kinetic Energy Ammunition OptimizationIJERA Editor
A research is being carried on to optimise long rod penetrators used in kinetic energy munitions. Kinetic energy
munitions performance can be measured by the penetration achieved in a normal impact on a semi-infinite steel
plate (rolled homogeneous armour, RHA). For a reference target (fixed characteristics and distance)
performance will depend of the properties and characteristics of the penetrator and the propellant charge,
assuming that no changes will be made in the firing gun. The properties and characteristics of the propellant
charge and of the penetrator will dictate the terminal velocity and how the penetrator will interact with the
target. This is a well known problem with several proved models available in the literature. However, no method
has been proposed to find an optimal configuration. In the present work, the penetration achieved with a
particular configuration (set of parameters) is combined with relevant penalisations thus providing its fitness for
ranking by the Genetic Algorithm code in the search for an optimal configuration.
Modal Analysis of a Square Plate with Different Shape Cut Outijtsrd
This Modal analysis is a major technique to determine the vibration characteristics of engineering structures and its component's. It is a process by which the natural frequencies, mode shapes of the structure can be determined with a relative ease. It should be a major alternative to provide a helpful contribution in understanding control of many vibration phenomena which encompasses in practice. In this work comparison of the natural frequency of the square plate with different cross sectional cut out is found by using FEA .The main objective of this paper is to determine the natural frequency and mode shape of a square plate with different shape cut outs. The area of cut out of different shapes is maintained same. Praveen Mirji ""Modal Analysis of a Square Plate with Different Shape Cut Out"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-3 , April 2019, URL: https://www.ijtsrd.com/papers/ijtsrd22847.pdf
Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/22847/modal-analysis-of-a-square-plate-with-different-shape-cut-out/praveen-mirji
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
The document discusses developing an open source print quality assessment program using the Fiji/ImageJ environment. It outlines that Fiji/ImageJ allows for free and flexible development of such a program using Java. It then provides examples of specific print quality features that could be extracted and analyzed such as line width, dots, color variations, and placement accuracy. The goal would be to increase productivity and automation for print quality evaluation.
The document discusses using polarimetry to characterize the surface properties of nanotechnology materials. Polarimetry measurements can provide information about surface roughness and periodic structures. Models are presented for using polarimetry to evaluate parameters like depolarization, entropy, and roughness for both random and periodic surfaces. Case studies are described applying these techniques to materials like aluminum films, silicon nanowires, and plastic films.
This document presents the design and investigation of a photonic crystal fiber (PCF) biosensor based on surface plasmon resonance (SPR). The proposed sensor aims to achieve higher sensitivity and a simpler structure compared to previous designs. It involves modeling a PCF structure with gold-coated holes using finite element analysis software. Parameters like hole diameter, gold thickness, and analyte refractive index are varied to optimize sensitivity. Simulation results show the proposed sensor achieves maximum amplitude sensitivity of 822 RIU-1, an improvement over previous designs. The simple structure makes it easy to fabricate.
This document is the diploma thesis of Jagannath Nandi submitted to the Czech Technical University in Prague. It investigates CFD simulation of flow and heat transfer from an impinging jet through a circular nozzle onto a flat plate. The thesis includes a literature review on experimental methods and data to validate the CFD model. It describes building 3D and 2D models in ANSYS Fluent and performing a grid independence study. Simulation results for constant and developed inlet velocity profiles at different Reynolds numbers and nozzle-plate distances are compared to experimental data. The thesis aims to evaluate the most accurate turbulence model for predicting heat transfer from the impinging jet.
Image De-noising on Strip Steel Surface Defect Using Improved Compressive Sen...TELKOMNIKA JOURNAL
De-noising for the strip steel surface defect image is conductive to the accurate detection of the strip steel
surface defects. In order to filter the Gaussian noise and salt and pepper noise of strip steel surface defect
images, an improved compressive sensing algorithm was applied to defect image de-noising in this paper.
First, the improved Regularized Orthogonal Matching Pursuit algorithm was described. Then, three typical
surface defects (scratch, scar, surface upwarping) images were selected as the experimental samples. Last,
detailed experimental tests were carried out to the strip steel surface defect image de-noising. Through
comparison and analysis of the test results, the Peak Signal to Noise Ratio value of the proposed algorithm
is higher compared with other traditional de-noising algorithm, and the running time of the proposed algorithm
is only26.6% of that of traditional Orthogonal Matching Pursuit algorithms. Therefore, it has better de-noising
effect and can meet the requirements of real-time image processing.
FusIon - On-Field Security and Privacy Preservation for IoT Edge Devices: Con...jamesinniss
FusIon - On-Field Security and Privacy Preservation for IoT Edge Devices: Concurrent Defense Against Multiple types of Hardware Trojan Attacks
Get more info here:
>>> https://bit.ly/38FXJav
Global Bilateral Symmetry Detection Using Multiscale Mirror HistogramsMohamed Elawady
M. ELAWADY, C. BARAT, C. DUCOTTET and P. COLANTONI
Laboratoire Hubert Curien, Saint-Etienne, FR
Conference "Advanced Concepts for Intelligent Vision Systems
" 2016
Design & simulation of dual band t shaped slot micro strip antenna for c-...eSAT Journals
This document describes the design and simulation of a dual band T-shaped microstrip patch antenna for C-band applications between 5.4GHz and 6.6GHz. The antenna was designed on an FR4 substrate using HFSS simulation software. Key results include return losses below -26dB, a voltage standing wave ratio below 1.2, gains between 2.7-4.8dB depending on frequency and substrate thickness, radiation efficiencies between 37-71%, and half power beamwidths of 60 degrees. The document analyzes the antenna performance parameters and field distributions at different operating frequencies and substrate thicknesses.
Image processing techniques applied for pitting corrosion analysiseSAT Journals
Abstract
In order to study the behavior of the early stage of pitting corrosion, an image analysis based on discrete wavelet packet transform
and fractals was used. Image feature parameters were extracted and analyzed to characterize the pitting corrosion development with
test time. It was found that the feature parameters: Shannon entropy, energy, fractal dimension and intercept increased with the test
time. Therefore the image processing techniques were promising and effective tools to analyze and detect the pitting corrosion.
Keywords: corrosion, pitting corrosion, surface topography, surface analysis, carbon steel, tap water
Terahertz Microstrip Patch Antenna Design for detection of Plastic Explosive ...IRJET Journal
This document describes the design and simulation of a terahertz microstrip patch antenna for detecting the plastic explosive SEMTEX. The antenna is designed using FR4 as the substrate material with a thickness of 1.62 μm and dielectric constant of 4.4. Copper is used for the radiating patch and ground plane. Computer Simulation Technology (CST) Microwave Studio is used to simulate the antenna. The results show the antenna resonates at 4.32 THz with a return loss of -52.10 dB, gain of 5.88 dB, directivity of 5.75 dBi, and input impedance of 49.15 Ω, making it suitable for detecting SEMTEX.
Advances in fatigue and fracture mechanics by grzegorz (greg) glinkaJulio Banks
Professor Grzegorz (Greg) Glinka has made substantial contributions to the field of stress concentration evaluation using linear FEA results using the ESED (Equivalent Striain Energy Density). ESED aka Glinka methods allows the determination of strain-stress state at a point of local concentration by equating the strain energy from the linear FEA area in the material strain-stress curve to that of the actual strain-stress of the material using a models such as Ramberg-Osgood. The ESED method is more accurate than the Neuber requiring the equating of SED (Strain Energy Densities) of linear FEA results that Stress is proportional to strain even when the FEA predicts a stress greater than the ultimate strength of the material. One easy method of remember when to use ESED versus Neuber is that ESED, more accurate, should be use on the stress analysis of rocket structures and Neuber delegated to aerospace engines and components.
Statistical Modelling of ft to Process Parameters in 30 NM Gate Length FinfetsVLSICS Design
This paper investigates the effect of process variations on unity gain frequency (ft) in 30 nm gate length FinFET by performing extensive TCAD simulations. Six different geometrical parameters, channel doping, source/drain doping and gate electrode work function are studied for their sensitivity on ft
. It is found that ft is more sensitive to gate length, underlap, gate-oxide thickness, channel and Source/Drain doping and less sensitive to source/drain width and length, and work function variations. Statistical modelling has been performed for ft through design of experiment with respect to sensitive parameters. The model has been validated through a comparison between random set of experimental data simulations and predicted values obtained from the model.
This document summarizes a thesis that studied the seismic performance of perforated steel plate shear walls (P-SPSWs) designed according to Canadian seismic provisions. Finite element models were developed and analyzed using nonlinear time history analysis to evaluate response parameters of 4-, 8-, and 12-story P-SPSWs. Results showed that dynamic base shear was significantly higher than static design values. Dynamic storey shear in the perforated infill plates agreed reasonably well with code equations. Infill plates yielded fully at peak accelerations for some earthquakes, while boundary members remained elastic.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Field Strength Predicting Outdoor ModelsIRJET Journal
This document discusses several outdoor propagation models used to predict radio signal strength and path loss over distance. It begins by introducing concepts of transmission power, signal strength, and path loss. It then describes common factors that affect outdoor radio propagation like diffraction, reflection, refraction, and scattering. The rest of the document summarizes several empirical, theoretical, and physical propagation models including Okumura, Hata, ECC-33, COST-231 Hata, and Egli models. These models use different methods and equations to predict path loss and were developed based on extensive radio signal measurement data in various outdoor environments.
An Evolutionary Method for Kinetic Energy Ammunition OptimizationIJERA Editor
A research is being carried on to optimise long rod penetrators used in kinetic energy munitions. Kinetic energy
munitions performance can be measured by the penetration achieved in a normal impact on a semi-infinite steel
plate (rolled homogeneous armour, RHA). For a reference target (fixed characteristics and distance)
performance will depend of the properties and characteristics of the penetrator and the propellant charge,
assuming that no changes will be made in the firing gun. The properties and characteristics of the propellant
charge and of the penetrator will dictate the terminal velocity and how the penetrator will interact with the
target. This is a well known problem with several proved models available in the literature. However, no method
has been proposed to find an optimal configuration. In the present work, the penetration achieved with a
particular configuration (set of parameters) is combined with relevant penalisations thus providing its fitness for
ranking by the Genetic Algorithm code in the search for an optimal configuration.
Modal Analysis of a Square Plate with Different Shape Cut Outijtsrd
This Modal analysis is a major technique to determine the vibration characteristics of engineering structures and its component's. It is a process by which the natural frequencies, mode shapes of the structure can be determined with a relative ease. It should be a major alternative to provide a helpful contribution in understanding control of many vibration phenomena which encompasses in practice. In this work comparison of the natural frequency of the square plate with different cross sectional cut out is found by using FEA .The main objective of this paper is to determine the natural frequency and mode shape of a square plate with different shape cut outs. The area of cut out of different shapes is maintained same. Praveen Mirji ""Modal Analysis of a Square Plate with Different Shape Cut Out"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-3 , April 2019, URL: https://www.ijtsrd.com/papers/ijtsrd22847.pdf
Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/22847/modal-analysis-of-a-square-plate-with-different-shape-cut-out/praveen-mirji
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Similar to Characterisation of the properties use of paper by topographical analysis of its surface (20)
The document discusses developing an open source print quality assessment program using the Fiji/ImageJ environment. It outlines that Fiji/ImageJ allows for free and flexible development of such a program using Java. It then provides examples of specific print quality features that could be extracted and analyzed such as line width, dots, color variations, and placement accuracy. The goal would be to increase productivity and automation for print quality evaluation.
This document summarizes research into the influence of print head rotation on inkjet print quality. The study aimed to determine the angular range for a four-color print head system that does not impact perceived print quality. Through numerical modeling and experimentation, the researchers found that a cone angle of less than 0.04 degrees between the four print heads was desirable to achieve over 75% color dot overlapping and accurate color reproduction. The work establishes tolerance thresholds for print head misalignment angles to ensure high quality text and color printing.
Virtual printing software can help enhance print quality by simulating the printing process. The software models interactions between ink, substrate, and printer components. It allows optimization of parameters like ink spectra, dot placement accuracy, and drop volume. The software generates print-ready swaths that can be analyzed for quality metrics like gamut, dots placement, and lines accuracy. This helps integrate manufacturers improve print quality without extensive physical testing.
Are 3D surface standard parameters discriminant for paper ?Christophe Mercier
The document discusses whether 3D surface standard parameters can effectively discriminate between paper surfaces. It defines several amplitude, spatial, and hybrid surface parameters. It then uses simulations to generate two virtual textures with the same parameter values and amplitude distributions as measured paper surfaces, but different visual appearances. This suggests that solely using standard parameters is insufficient for fully characterizing paper surface topography. Improved analysis considering additional texture aspects is needed.
Generalised description of the three-dimensional structure of paperChristophe Mercier
This document summarizes research using x-ray tomography to characterize the 3D structure of paper at the micrometer scale. Key findings include: (1) The structure is similar across different paper samples with some variation in pore size distribution. (2) Simulations using a layered fiber deposition model with pore filling better match experimental measurements of formation and pore structure than a uniform deposition model. (3) Further work is needed to model variations in porosity and structure with sample size.
Generalised description of the three-dimensional structure of paper
Characterisation of the properties use of paper by topographical analysis of its surface
1. Characterisation of the properties use of paper by topographical analysis of its surface Gérard Baudin et Jean-Francis Bloch - LGP2 - PAGORA Contact: mercier.christophe1@googlemail.com Christophe Mercier – September 2004
2. Outline Introduction Presentation of topics Pertinence and interpretation of topographical parameter s Application Conclusion and perspectives
3. Paper surface / PhD 23 May 2010 PhD defense " Paper is really not a perfect substrate for printing. A number of optical and physical imperfections, such as local variations in colour , optical density and surface topography , degrade the image each in their own manner . " Gustavson S. , 1995 " Although print gloss has been used as a quality factor for many years, the relation between the visual apparence of a printed paper and its surface roughness is not well understood " Bélan M.C., 2001 " It is mainly the surface properties like roughness and distribution of flocs that determine the quality of print. " Johansson J.O., 2002 Printing Gloss Profile model
6. Outline Introduction Presentation of topics Pertinence and interpretation of topographical parameters Applications Conclusion and perspectives
7. Objectives 23 May 2010 PhD defense I nterpretation of parameters Calend e ring Offset printing Acquisition Treatments
8. Measurement methods 23 May 2010 PhD defense Determination of spacing and acquisition length in order to obtain a statistically representative surface. Raw data treatment before exploitation.
9. Calendering 23 May 2010 PhD defense Objectives: Characterisation of surface variations due to successive passages in calendaring nip with : * 3D parameters, * ray-tracing.
10. Offset printing 23 May 2010 PhD defense Determination of the repartition of ink at the surface. Objectives: Determination of surface modifications due to printing.
11. Pertinence and interpretation 23 May 2010 PhD defense Discriminate different surfaces or profiles, with standard parameters . Objectives: For quality control, detect the variations of paper surface.
12. Outline Introduction Presentation of topics Pertinence and interpretation of topographical parameter s Application Conclusion and perspectives
13. Outline / param e t er interpr e tation 23 May 2010 PhD defense Introduction of 1 D and 2 D param e t er s Interpr e tations of 1 D et 2 D param e t er s Conventions : 1D for profile z = f(x) 2D for surface z = f(x,y)
15. Functional Characterisation 1D 23 May 2010 PhD defense Notations: P : Raw profile R: Roughness profile W: waviness profile Standard: NF EN ISO 4287, Dec 1998 Form Form + waviness Form + waviness + r oughness Y X
16. Functional Characterisation 1D 23 May 2010 PhD defense mean line Xs i Z p Z v Z t dz(x) dx Height distribution X Abbott curve Z i
21. Fourier limitation : L # N. 23 May 2010 PhD defense T1 = 323 (15); T2 = 212(24); T3 = 145(34);
22. Power Densit y S pectr um 23 May 2010 PhD defense Ajouter la définition Ind e pendance / acquisition length T1 = 323 (15) T2 = 212 (24) T3 = 145 (34)
23. A utocorrelation fu nction 23 May 2010 PhD defense Is c orrelation l ength a c h aract e risti c scale for paper ? l c
24. 2D classi cal ch aract e risation 23 May 2010 PhD defense Me thod s are similar to those used for p rofil e s : – Fourier T ransform – Areal A utocorrelation function (AACF)
25. Fourier: spectrum 23 May 2010 PhD defense Original surface Frequency spectrum Std
26. Areal A utocorrelation function (AACF) 23 May 2010 PhD defense Normalisation: Maximum = 1
27. Areal A utocorrelation function (AACF) 23 May 2010 PhD defense Simulated s urface AACF of the simulated surface AACF characteristic parameter
28. Areal A utocorrelation function (AACF) 23 May 2010 PhD defense Parameters: Sal and Str Representation of central lobe
29. 2 D Recommandation s 23 May 2010 PhD defense Five famil ies of param e t er s: * amplitude : 4 * spaci al (Sal, Str,….) : 4 * hybrid : 3 * Functional (Bearing Area) : 3 * Functional (Volumes) : 3 :17 Five famil ies of param e t er s: * amplitude : 4 * spaci al (Sal, Str,….) : 4 * hybrid : 3 * Functional (Bearing Area) : 3 * Functional (Volumes) : 3 :17
30. A mplitude p aram e t ers 23 May 2010 PhD defense
31. S pa tial p aram e t er s 23 May 2010 PhD defense
32. H ybrid p aram e t er s 23 May 2010 PhD defense
33. Outline / param e t er interpr e tation 23 May 2010 PhD defense Introduction of 1 D and 2 D param e t er s Interpr e tation of 1 D and 2 D param e t er s
34. Inter p r e tation of 1 D param e t er s 23 May 2010 PhD defense I nfluence of the n u mb er of param e t er s in order to c h aract e ris e a surface B ijectivit y profiles / param e t er s Objecti ve : P rofil e models : three fixed param e t er s four fixed param e t er s five fixed param e t er s five fixed param e t er s + Abbott curve
35. Studied (me a sure d ) p rofil e 23 May 2010 PhD defense Abbott curve
36. T hree param e t er s: mod el 23 May 2010 PhD defense Lm Psm h X Z X Principle Three targeted parameters : Pa, Psk, PSm Overhead
37. Three param e t ers : r e sults 23 May 2010 PhD defense
38. Four param e t er s: mod el 23 May 2010 PhD defense L1 L4 L3 L2 Psm hv hp Z X Remar k : Sku is constant F our targeted parameters : Pq, Psk, PSm , PDq
39. Four param e t er s: r e sults 23 May 2010 PhD defense
40. Five param e t er s: mod e l 23 May 2010 PhD defense Five targeted parameters : Pq, Psk, PSm, PDq, Pku d d p 1 p 3 p 2 V 2 V 1 V 3
41. Five param eters : r e sult s 23 May 2010 PhD defense Altitude d istribution
42. Five param e t er s + Abbott: mod e l 23 May 2010 PhD defense Five targeted parameters : Pq, Psk, Pku, PSm, PDq + Abbott curve C onstant height , variable ellipticit y
43. Five param e t er s + Abbott: r e sult s 23 May 2010 PhD defense Measured profile Virtual profile
44. Conclusion / profile 23 May 2010 PhD defense Models of profiles : non-bijectivity (discrimination / Fourier T ransform or autocorr e lation f u nction …)
45. Outline / param e t er interpr e tation 23 May 2010 PhD defense Introduction of 1 D and 2 D param e t er s Interpr e tation of 1 D and 2 D param e t er s
46. 2D param e t er s i nterpr e tation 23 May 2010 PhD defense S urface m od e l s : * either with rectangular or curved e l e ments / fibres * or with sinuso idal functions Study bijectivit y surfaces param eters Objecti ve s:
47. Texture n°1: m e thod 23 May 2010 PhD defense rectangular or curved e l e ments + random noise
48. Texture n°1: r e sults 23 May 2010 PhD defense 12 parameters are similar Overhead
49. Texture n°1: r es ults 23 May 2010 PhD defense Measured s urface Virtual s urface
52. Texture n°1bis: r e sults 23 May 2010 PhD defense Measured s urface Simulated s urface 12 parameters and Abbott curve are similar !
53. Second method 23 May 2010 PhD defense Condition : S tructura l e l e ment of the model surface: fibre. Question: Other s tructura l e l e ment s ? Surface mod e l Measured Surface
54. Texture n°2: m e thod 23 May 2010 PhD defense µm µm A mplitude d istribution Orientation Noise
55. Texture n°2: r e sults 23 May 2010 PhD defense Param e t er s A mplitude d istribution Measured s urface S imul ated s urface
56. Texture n°2: r e sults 23 May 2010 PhD defense 12 parameters and Abbott curve are similar !
57. Texture n°2: limitations 23 May 2010 PhD defense Areal A utocorrelation function S imul ated s urface Measured s urface
58. Conclusion / surface 23 May 2010 PhD defense Non bijectivity parameters / surfaces Visu al perception
59. Outline Introduction Presentation of topics Pertinence and interpretation of topographical parameter s Application calandering offset printing Conclusion and perspectives
62. Light re fle ction 23 May 2010 PhD defense Objecti ve : Simulation of 1 D and 2 D indicatrix of diffusion Measured indicatrix of diffusion S urface topography
63. Surface light reflection 23 May 2010 PhD defense Normal lobe Specular reflection Incident ray Forescatter lobe Net reflexion 2µm Backscatter lobe
64. BRDF : Bidirectionnal Reflectance Distribution Function 23 May 2010 PhD defense 3 2 1 d i d r X N Y ds
65. Reflection models 23 May 2010 PhD defense Re fle ct ion m od e l E mpiri cal a ppro a ch Ge om e tri cal a ppro a ch P hysi cal a ppro a ch Th e or y pertubati on Th e or y Kirchhoff Mod e l Lamberti a n Mod e l Phong Mod e l Ward Mod e l Torrance-Sparrow Mod el Cook and Torrance Mod e l Nayar Mod e l Beckmann and Spizzichino
66. Cook and Torrance 23 May 2010 PhD defense D: surface model Length of correlation root mean square of altitudes
67. RMS + Length of correlation 23 May 2010 PhD defense Profils measure Filering Calculation rms and lc plot Measure of indicatrix /
68. RMS + Length of correlation 23 May 2010 PhD defense / Profils measure Filering Calculation rms and lc plot Measure of indicatrix
69. Ray tracing - profiles - principle 23 May 2010 PhD defense Source Mean plan of surface
70. Ray tracing - profiles - simulation 23 May 2010 PhD defense Simulation of profiles (RMS and L c ) Control of RMS and L c Trace of curve Ray-tracing / Trace of curve RMS constant
71. Ray tracing - profiles - simulation 23 May 2010 PhD defense L c constant
72. Ray tracing – measured profiles 23 May 2010 PhD defense
73. Ray tracing - measured profiles 23 May 2010 PhD defense
74. Ray tracing - measured profiles 23 May 2010 PhD defense Examples : Measured indicatrix of diffusion Simulated indicatrix of reflection sb 0 sb 1*60 sb2*60 sb 3*60
75. Conclusion ray tracing 23 May 2010 PhD defense Ray-tracing: qualitative effect of calandering RMS and correlation length # paper profile
76. Solid printing (1) 23 May 2010 PhD defense Objective: Spatial non- uniformit y ch aract e risation of ink distribution , mean ink thickness , … Only one crater considered : Contact angle controled
79. Conclusion / Solid printing 23 May 2010 PhD defense This model is useful to study industrial problems linked to non- homogeneous repartition of ink
80. Halftone printing (1) 23 May 2010 PhD defense Objective: Determination of ink distribution in surface thanks to modification of amplitude distribution before/after printing. % surface
81. Halftone printing(2) 23 May 2010 PhD defense Method: determination of mean and RMS ink thickness repartition
83. Conclusion / Halftone printing 23 May 2010 PhD defense From a paper surface measurement, we obtain a number of points and a thickness of deposed ink in order to superpose the amplitude distribution of both measured and simulated printed surface.
84. Outline Introduction Presentation of topics Pertinence and interpretation of topographical parameter s Application Conclusion and perspectives
85. Conclusion 23 May 2010 PhD defense From a paper surface measurement, we obtain a number of points and a thickness of deposed ink in order to superpose the amplitude distribution of both measured and simulated printed surface. Printing model are useful to study industrial problems linked to non- homogeneous repartition of ink Ray-tracing: qualitative effect of calandering , RMS and correlation length # paper profile
92. Fourier: spectres 23 May 2010 PhD defense Surface simulée TF de la surface simulée
93. Classical characterisation 2D 23 May 2010 PhD defense Spectral analysis : periodic components of the profile are pointed out using Fourier transform, due periodogramme and power spectrum density Spatial analysis : des correlations entre une réalisation à une position x t et les positions précédentes sont recherchées. La fonction d’autocorrélation est utilisée l’analyse temps/fréquence : elle a pour vocation de mettre en évidence des inhomogénéités présentes dans le profil. (/O ndelettes)
94. Ray tracing - surfaces - principe 23 May 2010 PhD defense
95. Ray tracing - surfaces - cas réels 23 May 2010 PhD defense Papier Alpastar Gloss Semi-mat Mat
96. Ray tracing - surfaces - cas réels 23 May 2010 PhD defense Papier Hello Gloss Semi-mat Mat
97. Ray tracing - surfaces - cas réels 23 May 2010 PhD defense Papier Alpanova Gloss Semi-mat Mat
98. Ray tracing - surfaces - cas réels 23 May 2010 PhD defense Papier Econova Gloss Semi-mat Mat
99. BRDF : Bidirectionnal Reflectance Distribution Function 23 May 2010 PhD defense 3 2 1 d i d r X N Y
100. Cook and Torrance 23 May 2010 PhD defense D: surface model Length of correlation root mean square of altitudes
101. Correlation length vs Length of statistical stability 23 May 2010 PhD defense C:arteauorel_calandreiltre_5mmb3f100_5mm.pro Measured profile Correlation length Length of statistical stability
Editor's Notes
Quel est le problème en question? Qu’est-ce qui a été fait dans le passé pour régler ce problème? Qu’est-ce que VOUS faites pour régler le problème? Quelle est la valeur ajoutée de votre approche? Que devons-nous faire maintenant?
Nous nous sommes dotées d’un système d’acquisition, comprenant un capteur point à point basée sur la principe de l’aberaation chromatique, qui permet de décrire la surface par une matrice de point espacé du distance appelé pas
Déterminer le choix
Situé entre la présentation des outils et leur utilisation au chapitre 6, un chapitre est consacré à leur connaissance
Quel est le problème en question? Qu’est-ce qui a été fait dans le passé pour régler ce problème? Qu’est-ce que VOUS faites pour régler le problème? Quelle est la valeur ajoutée de votre approche? Que devons-nous faire maintenant?
Ne sont présentés …
Par rapport au cas précédent, nous introduisons le paramètre Pku, traduisant l’aplatissement de la distribution des amplitudes Remarque: la méthode plus simple consisterait à faire des marches sur trois niveaux. Nous passons au niveaux des fibres.
Par rapport au cas précédent, nous ajoutons la courbe d’Abbott Nous jouons sur l’ellipticité de la fibre
Quel est le problème en question? Qu’est-ce qui a été fait dans le passé pour régler ce problème? Qu’est-ce que VOUS faites pour régler le problème? Quelle est la valeur ajoutée de votre approche? Que devons-nous faire maintenant?
Quel est le problème en question? Qu’est-ce qui a été fait dans le passé pour régler ce problème? Qu’est-ce que VOUS faites pour régler le problème? Quelle est la valeur ajoutée de votre approche? Que devons-nous faire maintenant?
Quel est le problème en question? Qu’est-ce qui a été fait dans le passé pour régler ce problème? Qu’est-ce que VOUS faites pour régler le problème? Quelle est la valeur ajoutée de votre approche? Que devons-nous faire maintenant?
Quel est le problème en question? Qu’est-ce qui a été fait dans le passé pour régler ce problème? Qu’est-ce que VOUS faites pour régler le problème? Quelle est la valeur ajoutée de votre approche? Que devons-nous faire maintenant?
Quel est le problème en question? Qu’est-ce qui a été fait dans le passé pour régler ce problème? Qu’est-ce que VOUS faites pour régler le problème? Quelle est la valeur ajoutée de votre approche? Que devons-nous faire maintenant?
Quel est le problème en question? Qu’est-ce qui a été fait dans le passé pour régler ce problème? Qu’est-ce que VOUS faites pour régler le problème? Quelle est la valeur ajoutée de votre approche? Que devons-nous faire maintenant?
Quel est le problème en question? Qu’est-ce qui a été fait dans le passé pour régler ce problème? Qu’est-ce que VOUS faites pour régler le problème? Quelle est la valeur ajoutée de votre approche? Que devons-nous faire maintenant?
Quel est le problème en question? Qu’est-ce qui a été fait dans le passé pour régler ce problème? Qu’est-ce que VOUS faites pour régler le problème? Quelle est la valeur ajoutée de votre approche? Que devons-nous faire maintenant?
Quel est le problème en question? Qu’est-ce qui a été fait dans le passé pour régler ce problème? Qu’est-ce que VOUS faites pour régler le problème? Quelle est la valeur ajoutée de votre approche? Que devons-nous faire maintenant?
Quel est le problème en question? Qu’est-ce qui a été fait dans le passé pour régler ce problème? Qu’est-ce que VOUS faites pour régler le problème? Quelle est la valeur ajoutée de votre approche? Que devons-nous faire maintenant?