This document analyzes the electro-thermal stress and strain in a functionally graded metal (FGM) line under a direct current field. The FGM line is composed of copper and aluminum with properties varying linearly along the length. A finite difference method is used to numerically solve the coupled electrical, thermal, and mechanical equations. The results show that thermal stress and strain in the FGM line are between those of pure copper and aluminum lines. Maximum stress and strain occur slightly offset from the midpoint in the FGM line. Buried lines experience higher stress and strain than bare lines due to lack of convective cooling at the surface.
RESEARCH ON INDUCTION HEATING - A REVIEWEditor IJCATR
This paper presents results of finite element analysis of induction heating problems considering temperature dependence of
material characteristics. In this analysis, we have used the three-dimensional finite element method in order to correctly express
induction heating coil’s shapes and to make clear its effects on temperature distributions. The heat-conducting problem and the eddy
current problem are coupled, and solved by using the step-by-step calculations.
THE INFLUENCE OF SHAPE AND SPATIAL DISTRIBUTION OF METAL PARTICLES ON THE THE...IAEME Publication
In this paper, the effect of shape and spatial distribution of metal particles on the thermal conductivity of nickel-silicone composites is investigated to find out the optimum shape and spatial distribution of metal particles in polymer composites. Various finite element models with different particles shapes and arrangements are constructed to predict composite thermal conductivity.
Analysis of Thermal Buckling of Ceramic-Metal Functionally Graded Plates Usin...IJERA Editor
Functionally graded materials (FGMs) are microscopically inhomogeneous spatial composite materials,
typically composed of a ceramic-metal or ceramic-polymer pair of materials. Therefore, it is important to
investigate the behaviors of engineering structures such as beams and plates made from FGMs when they are
subjected to thermal loads for appropriate design. Therefore, using an improved third order shear deformation
theory (TSDT) based on more rigorous kinetics of displacements to predict the behaviors of functionally graded
plates is expected to be more suitable than using other theories. In this paper, the improved TSDT is used to
investigate thermal buckling of functionally graded plates.
Temperature dependent material property solutions are adopted to investigate thermal buckling results of
functionally graded plates. To obtain the solutions, the Ritz method using polynomial and trigonometric
functions for defining admissible displacements and rotations is applied to solve the governing equations.
RESEARCH ON INDUCTION HEATING - A REVIEWEditor IJCATR
This paper presents results of finite element analysis of induction heating problems considering temperature dependence of
material characteristics. In this analysis, we have used the three-dimensional finite element method in order to correctly express
induction heating coil’s shapes and to make clear its effects on temperature distributions. The heat-conducting problem and the eddy
current problem are coupled, and solved by using the step-by-step calculations.
THE INFLUENCE OF SHAPE AND SPATIAL DISTRIBUTION OF METAL PARTICLES ON THE THE...IAEME Publication
In this paper, the effect of shape and spatial distribution of metal particles on the thermal conductivity of nickel-silicone composites is investigated to find out the optimum shape and spatial distribution of metal particles in polymer composites. Various finite element models with different particles shapes and arrangements are constructed to predict composite thermal conductivity.
Analysis of Thermal Buckling of Ceramic-Metal Functionally Graded Plates Usin...IJERA Editor
Functionally graded materials (FGMs) are microscopically inhomogeneous spatial composite materials,
typically composed of a ceramic-metal or ceramic-polymer pair of materials. Therefore, it is important to
investigate the behaviors of engineering structures such as beams and plates made from FGMs when they are
subjected to thermal loads for appropriate design. Therefore, using an improved third order shear deformation
theory (TSDT) based on more rigorous kinetics of displacements to predict the behaviors of functionally graded
plates is expected to be more suitable than using other theories. In this paper, the improved TSDT is used to
investigate thermal buckling of functionally graded plates.
Temperature dependent material property solutions are adopted to investigate thermal buckling results of
functionally graded plates. To obtain the solutions, the Ritz method using polynomial and trigonometric
functions for defining admissible displacements and rotations is applied to solve the governing equations.
Transient Numerical Analysis of Induction Heating of Graphite Cruciable at Di...ijeljournal
Mathematical modeling of Induction heating process is done by using 2D axisymmetric geometry.
Induction heating is coupled field problem that includes electromagnetism and heat transfer. Mathematical
modeling of electromagnetism and heat transfer is done by using maxwell equations and classical heat
transfer equation respectively. Temperature dependent material properties are used for this analysis. This
analysis includes coil voltage distribution, crucible electromagnetic power, and coil equivalent impedance
at different frequency. Induction coil geometry effect on supply voltage is also analyzed. This analysis is
useful for designing of induction coil for melting of nonferrous metal such as gold, silver, uranium etc.
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.
Effect of Process Parameters on the Total Heat Damaged Zone (HDZ) during Micr...IJAMSE Journal
In micro electrical discharge machining, three subsurface layersare formed on the workpiece, they are; recast zone, heat affected zone and converted zone, primarily due to heating-quenching cycles. The HDZ in micro-EDM is characterized by cracks and weakness in the grain boundary and thermal residual stresses. This paper presents the effect of process parameters on the HDZ in micro-EDM of plastic mold steel 1.2738. As the energy of the sparks increases, the thickness of the HDZ increases and the average coefficient of correlation between energy and HDZ considering three different sections of the zone is 0.8099. Therefore, the effect of process parameters governing the discharge energy are analyzed; they are: average current (Ia), peak current (Ip) and pulse ‘on-time’ (Ton). An overall increase in heat-damaged zone thickness by 105% is observed with an increase in pulse on time.
Transient Numerical Analysis of Induction Heating of Graphite Cruciable at Di...ijeljournal
Mathematical modeling of Induction heating process is done by using 2D axisymmetric geometry.
Induction heating is coupled field problem that includes electromagnetism and heat transfer. Mathematical
modeling of electromagnetism and heat transfer is done by using maxwell equations and classical heat
transfer equation respectively. Temperature dependent material properties are used for this analysis. This
analysis includes coil voltage distribution, crucible electromagnetic power, and coil equivalent impedance
at different frequency. Induction coil geometry effect on supply voltage is also analyzed. This analysis is
useful for designing of induction coil for melting of nonferrous metal such as gold, silver, uranium etc.
Transient numerical analysis of induction heating of graphite cruciable at di...ijeljournal
Mathematical modeling of Induction heating process is done by using 2D axisymmetric geometry. Induction heating is coupled field problem that includes electromagnetism and heat transfer. Mathematical
modeling of electromagnetism and heat transfer is done by using maxwell equations and classical heat
transfer equation respectively. Temperature dependent material properties are used for this analysis. This
analysis includes coil voltage distribution, crucible electromagnetic power, and coil equivalent impedance
at different frequency. Induction coil geometry effect on supply voltage is also analyzed. This analysis is useful for designing of induction coil for melting of nonferrous metal such as gold, silver, uranium etc.
The AC total interference of faulted power lines to gas pipelines sharing the same right of way, which may pose a threat to operating personnel and equipment, was studied. The main advantage of this work is to determine the effects of different soil structures on the induced voltage for various soil resistivities. Two main approaches were used to compute the induced voltages, namely the method of moment (MOM), which is based on electromagnetic field theory, and the circuit based method, which uses the circuit grounding analysis to compute the conductive interference and the circuit based models to compute the inductive interference. A 10-km-long parallel pipeline-transmission line model was developed. The soil resistivity was varied, and the induced voltages obtained from both approaches were compared. Soil resistivity and soil structure are important parameters that affect the AC interference level. The results of the study show that the earth potentials and the metal GPRS are independent. Higher soil resistivity causes the tower ground resistance to increase, thus making the shield wire’s attractiveness as a fault current return path to increase, which in turn forces the induced net EMF and the cumulative GPR in the pipeline to reduce.
Effect of Bond Layer on Tri-Layered Assembly Subjected To Differential Unifor...IJERA Editor
In the present analytical and numerical study, the thermal mismatching stress induced under differential
temperature conditions of tri-layered assembly with bond is investigated. The thermal mismatching stresses are
one of the reasons for structural failures between two or more connected devices. Therefore it is very essential to
understand variation of these stresses and estimation in the interfaces play an important role in design and
reliability studies of microelectronic assemblies. In this paper, a physical model is proposed for the interfacial
shearing and peeling stresses occurring at the interfaces of tri-layered dissimilar materials with the effect of
bonding subjected to differential uniform temperature in the layer. It observed from both analytical and
numerical study that the shearing stress reduced in the range of 60% to 70% at interface (1-2) and 35% to 40%
at (2-3) interface. Peeling stress are continuously reduced in the range of 10% - 20% at (1-2) interface and 13%
- 35% at (2-3) interface due to the influence of bond layer. Thus, it indicates that, the bond layer consideration
may influence significantly on interfacial stress. It is found that the both interfacial shearing stresses and peeling
stresses decreased considerably at the interface with the increase of bond layer thickness.
4.thermal stress analysis of peek fiber composites at cryogenic temperatureEditorJST
Fiber reinforced composites are class of materials that are workable engineering materials
possessing high strength to weight ratio resulting in reduction of weight and hence savings in energy.
Composites can be tailor -made to the required duty by changing the nature and proportion of the constituent
materials. Composites exhibit anisotropy in mechanical and thermal properties. This makes the design of
composite structures more complex and demanding. Composites have wide applications as supports and
structures at cryogenic temperatures in super conducting magnets and as fuel tankage in spacecraft and rocketry.
As these composites are fabricated at 1000 C to 2000 C, ~ their use at low temperatures creates thermal stresses.
They become brittle at low temperatures and thermal strain of matrix ma:f be of the same order of the ultimate
tensile strain at helium temperature (4.2K); thus leaving no more load bearing capability.
Analytical Study of Steel Fibre Reinforced Rigid Pavements Under Moving Loadsijsrd.com
Nowadays, the application of steel fibers in concrete has increased gradually as an engineering material. The knowledge is not only necessary to provide safe, efficient and economic design for the present, but it also to serve as a rational basis for extended future applications. In this study, steel fibre reinforced rigid pavements are analyzed for stresses developed due to Moving loads & temperature differentials. Comparison of curling stresses in SFRC with conventional concrete is carried out. All the models are generated and analysis is carried out using the ANSYS software. Parametric study for the effect of change in slab length & slab thickness of pavements on curling stresses is also done. Curling stresses due to Linear & Non linear temperature distribution in top & bottom layer of SFRC pavement slabs are also calculated. Frictional stresses in SFRC due to uniform temperature differential are almost same as conventional concrete. Analysis results shows, SFRC develops more stresses as compared to conventional concrete & Non linear temperature distribution develops more stresses than linear temperature distribution. SFRC pavements are analyzed for Single axle moving loads for two different speeds. Results reveal that the loading stresses are higher, when the loads are at starting position of edge.
In the present work, static and free vibration response of functionally graded beam
is investigated under thermal environment using Finite Element method (FEM). The
functionally graded (FG) material beam is considered to be composed of various
material combinations like metal/metal, metal/ceramic and ceramic/ceramic. The
material properties of the beam are assumed to be graded in the thickness direction
according to a simple power law distribution. The deflection and mode shapes of the
FG beams are obtained for Clamped-Free, Clamped-Clamped and Simply Supported
boundary conditions under both mechanical and thermal load. Numerical results are
obtained for the model in ANSYS software to show the influence of grading of materials,
material constituents, boundary conditions, volume fraction and temperature
conditions on the response of the FG beams
This lecture aims at developing a qualitative understanding of binary phase diagrams by reference to the model systems Cu-Ni, Ni-Pt, Au-Ni and Ag-Cu, and also by reference to the Phase Rule. It applies the basic concepts of phase diagrams to binary aluminium alloys; it also aims at extending the discussion to an outline of ternary phase diagrams, and at showing how a so-called pseudo-binary section can be applied with benefit to the Al-Mg-Si system for alloys balanced in Mg<sub>2</sub>Si.
International Journal of Computational Engineering Research(IJCER)ijceronline
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
ANALYSIS OF TEMPERATURE FIELD IN A COMPOSITE FUNCTIONALLY GRADED MATERIAL PLA...IJAMSE Journal
A finite element model is constructed to analyze the effects of steady state temperature field on FGM layer
thickness. The first-order shear deformation model is exploited to investigate the uncoupled thermal
behavior of functionally graded plates in Abacus environment. The continuum is divided into 540 elements
and 541 nodes using two node linear elements. The results show that the temperature distribution in the
composite plate is more reasonable with increase in the thickness of FGM layer. The comparison with the
non-graded two layered composite plate, the temperature field of the Zirconia/FGM/Aluminum three
layered composite plate is in the form of a curve but in case of non-graded two layered composite plate the
temperature field is in the form of inclined straight line with sharp bend at the interface of metal and
ceramic phase.
To perform geological exploration by the geophysical method of electrical resistivity.
The objective of this research is to evaluate the water potential of the study area by investigating the shallow subsurface aquifer material properties and moisture distribution using 2D ERT techniques. During the shallow tube well design and development in the study area, some patches of land does have good potential and some does not, which motivated to understand the aquifer properties, aquifer material, and response. Hence the 2D ERT was carried out, oriented around the pond in the center and five ERT profiles.
Optimized Traffic Signal Control System at Traffic Intersections Using VanetIOSR Journals
Abstract: Traditional Automated traffic signal control systems normally schedule the vehicles at intersection in
a pre timed slot manner. This pre-timed controller approach fails to minimize the waiting time of vehicles at the
traffic intersection as it doesn’t consider the arrival time of vehicles. To overcome this problem an adaptive and
intelligent traffic control system is proposed in such a way that a traffic signal controller with wireless radio
installed at the intersection and it is considered as an infrastructure. All the vehicles are equipped with onboard
location, speed sensors and a wireless radio to communicate with the infrastructure thereby VANET is formed.
Once the vehicles enter into the boundary of traffic area, they broadcast their positional information as data
packet with their encapsulated ID in it. The controller at the intersection receives the transmitted packets from
all the legs of intersection and then stores it in a temporary log file. Now the controller runs Platooning
algorithm to group the vehicles approximately in equal size of platoons. The platoons are formed on the basis of
data disseminated by the vehicles. Then the controller runs Oldest Job First algorithm which treats platoons as
jobs. The algorithm schedules jobs in conflict free manner and ensures all the jobs utilize equal processing time
i.e the vehicles of each platoons cross the intersection at equal delays. The proposed approach is evaluated
under various traffic volumes and the performance is analyzed.
Keywords Conflict graphs, online job scheduling, traffic signal control, vehicular ad hoc network (VANET)
simulation, vehicle-actuated traffic signal control, Webster’s algorithm.
Transient Numerical Analysis of Induction Heating of Graphite Cruciable at Di...ijeljournal
Mathematical modeling of Induction heating process is done by using 2D axisymmetric geometry.
Induction heating is coupled field problem that includes electromagnetism and heat transfer. Mathematical
modeling of electromagnetism and heat transfer is done by using maxwell equations and classical heat
transfer equation respectively. Temperature dependent material properties are used for this analysis. This
analysis includes coil voltage distribution, crucible electromagnetic power, and coil equivalent impedance
at different frequency. Induction coil geometry effect on supply voltage is also analyzed. This analysis is
useful for designing of induction coil for melting of nonferrous metal such as gold, silver, uranium etc.
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.
Effect of Process Parameters on the Total Heat Damaged Zone (HDZ) during Micr...IJAMSE Journal
In micro electrical discharge machining, three subsurface layersare formed on the workpiece, they are; recast zone, heat affected zone and converted zone, primarily due to heating-quenching cycles. The HDZ in micro-EDM is characterized by cracks and weakness in the grain boundary and thermal residual stresses. This paper presents the effect of process parameters on the HDZ in micro-EDM of plastic mold steel 1.2738. As the energy of the sparks increases, the thickness of the HDZ increases and the average coefficient of correlation between energy and HDZ considering three different sections of the zone is 0.8099. Therefore, the effect of process parameters governing the discharge energy are analyzed; they are: average current (Ia), peak current (Ip) and pulse ‘on-time’ (Ton). An overall increase in heat-damaged zone thickness by 105% is observed with an increase in pulse on time.
Transient Numerical Analysis of Induction Heating of Graphite Cruciable at Di...ijeljournal
Mathematical modeling of Induction heating process is done by using 2D axisymmetric geometry.
Induction heating is coupled field problem that includes electromagnetism and heat transfer. Mathematical
modeling of electromagnetism and heat transfer is done by using maxwell equations and classical heat
transfer equation respectively. Temperature dependent material properties are used for this analysis. This
analysis includes coil voltage distribution, crucible electromagnetic power, and coil equivalent impedance
at different frequency. Induction coil geometry effect on supply voltage is also analyzed. This analysis is
useful for designing of induction coil for melting of nonferrous metal such as gold, silver, uranium etc.
Transient numerical analysis of induction heating of graphite cruciable at di...ijeljournal
Mathematical modeling of Induction heating process is done by using 2D axisymmetric geometry. Induction heating is coupled field problem that includes electromagnetism and heat transfer. Mathematical
modeling of electromagnetism and heat transfer is done by using maxwell equations and classical heat
transfer equation respectively. Temperature dependent material properties are used for this analysis. This
analysis includes coil voltage distribution, crucible electromagnetic power, and coil equivalent impedance
at different frequency. Induction coil geometry effect on supply voltage is also analyzed. This analysis is useful for designing of induction coil for melting of nonferrous metal such as gold, silver, uranium etc.
The AC total interference of faulted power lines to gas pipelines sharing the same right of way, which may pose a threat to operating personnel and equipment, was studied. The main advantage of this work is to determine the effects of different soil structures on the induced voltage for various soil resistivities. Two main approaches were used to compute the induced voltages, namely the method of moment (MOM), which is based on electromagnetic field theory, and the circuit based method, which uses the circuit grounding analysis to compute the conductive interference and the circuit based models to compute the inductive interference. A 10-km-long parallel pipeline-transmission line model was developed. The soil resistivity was varied, and the induced voltages obtained from both approaches were compared. Soil resistivity and soil structure are important parameters that affect the AC interference level. The results of the study show that the earth potentials and the metal GPRS are independent. Higher soil resistivity causes the tower ground resistance to increase, thus making the shield wire’s attractiveness as a fault current return path to increase, which in turn forces the induced net EMF and the cumulative GPR in the pipeline to reduce.
Effect of Bond Layer on Tri-Layered Assembly Subjected To Differential Unifor...IJERA Editor
In the present analytical and numerical study, the thermal mismatching stress induced under differential
temperature conditions of tri-layered assembly with bond is investigated. The thermal mismatching stresses are
one of the reasons for structural failures between two or more connected devices. Therefore it is very essential to
understand variation of these stresses and estimation in the interfaces play an important role in design and
reliability studies of microelectronic assemblies. In this paper, a physical model is proposed for the interfacial
shearing and peeling stresses occurring at the interfaces of tri-layered dissimilar materials with the effect of
bonding subjected to differential uniform temperature in the layer. It observed from both analytical and
numerical study that the shearing stress reduced in the range of 60% to 70% at interface (1-2) and 35% to 40%
at (2-3) interface. Peeling stress are continuously reduced in the range of 10% - 20% at (1-2) interface and 13%
- 35% at (2-3) interface due to the influence of bond layer. Thus, it indicates that, the bond layer consideration
may influence significantly on interfacial stress. It is found that the both interfacial shearing stresses and peeling
stresses decreased considerably at the interface with the increase of bond layer thickness.
4.thermal stress analysis of peek fiber composites at cryogenic temperatureEditorJST
Fiber reinforced composites are class of materials that are workable engineering materials
possessing high strength to weight ratio resulting in reduction of weight and hence savings in energy.
Composites can be tailor -made to the required duty by changing the nature and proportion of the constituent
materials. Composites exhibit anisotropy in mechanical and thermal properties. This makes the design of
composite structures more complex and demanding. Composites have wide applications as supports and
structures at cryogenic temperatures in super conducting magnets and as fuel tankage in spacecraft and rocketry.
As these composites are fabricated at 1000 C to 2000 C, ~ their use at low temperatures creates thermal stresses.
They become brittle at low temperatures and thermal strain of matrix ma:f be of the same order of the ultimate
tensile strain at helium temperature (4.2K); thus leaving no more load bearing capability.
Analytical Study of Steel Fibre Reinforced Rigid Pavements Under Moving Loadsijsrd.com
Nowadays, the application of steel fibers in concrete has increased gradually as an engineering material. The knowledge is not only necessary to provide safe, efficient and economic design for the present, but it also to serve as a rational basis for extended future applications. In this study, steel fibre reinforced rigid pavements are analyzed for stresses developed due to Moving loads & temperature differentials. Comparison of curling stresses in SFRC with conventional concrete is carried out. All the models are generated and analysis is carried out using the ANSYS software. Parametric study for the effect of change in slab length & slab thickness of pavements on curling stresses is also done. Curling stresses due to Linear & Non linear temperature distribution in top & bottom layer of SFRC pavement slabs are also calculated. Frictional stresses in SFRC due to uniform temperature differential are almost same as conventional concrete. Analysis results shows, SFRC develops more stresses as compared to conventional concrete & Non linear temperature distribution develops more stresses than linear temperature distribution. SFRC pavements are analyzed for Single axle moving loads for two different speeds. Results reveal that the loading stresses are higher, when the loads are at starting position of edge.
In the present work, static and free vibration response of functionally graded beam
is investigated under thermal environment using Finite Element method (FEM). The
functionally graded (FG) material beam is considered to be composed of various
material combinations like metal/metal, metal/ceramic and ceramic/ceramic. The
material properties of the beam are assumed to be graded in the thickness direction
according to a simple power law distribution. The deflection and mode shapes of the
FG beams are obtained for Clamped-Free, Clamped-Clamped and Simply Supported
boundary conditions under both mechanical and thermal load. Numerical results are
obtained for the model in ANSYS software to show the influence of grading of materials,
material constituents, boundary conditions, volume fraction and temperature
conditions on the response of the FG beams
This lecture aims at developing a qualitative understanding of binary phase diagrams by reference to the model systems Cu-Ni, Ni-Pt, Au-Ni and Ag-Cu, and also by reference to the Phase Rule. It applies the basic concepts of phase diagrams to binary aluminium alloys; it also aims at extending the discussion to an outline of ternary phase diagrams, and at showing how a so-called pseudo-binary section can be applied with benefit to the Al-Mg-Si system for alloys balanced in Mg<sub>2</sub>Si.
International Journal of Computational Engineering Research(IJCER)ijceronline
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
ANALYSIS OF TEMPERATURE FIELD IN A COMPOSITE FUNCTIONALLY GRADED MATERIAL PLA...IJAMSE Journal
A finite element model is constructed to analyze the effects of steady state temperature field on FGM layer
thickness. The first-order shear deformation model is exploited to investigate the uncoupled thermal
behavior of functionally graded plates in Abacus environment. The continuum is divided into 540 elements
and 541 nodes using two node linear elements. The results show that the temperature distribution in the
composite plate is more reasonable with increase in the thickness of FGM layer. The comparison with the
non-graded two layered composite plate, the temperature field of the Zirconia/FGM/Aluminum three
layered composite plate is in the form of a curve but in case of non-graded two layered composite plate the
temperature field is in the form of inclined straight line with sharp bend at the interface of metal and
ceramic phase.
To perform geological exploration by the geophysical method of electrical resistivity.
The objective of this research is to evaluate the water potential of the study area by investigating the shallow subsurface aquifer material properties and moisture distribution using 2D ERT techniques. During the shallow tube well design and development in the study area, some patches of land does have good potential and some does not, which motivated to understand the aquifer properties, aquifer material, and response. Hence the 2D ERT was carried out, oriented around the pond in the center and five ERT profiles.
Optimized Traffic Signal Control System at Traffic Intersections Using VanetIOSR Journals
Abstract: Traditional Automated traffic signal control systems normally schedule the vehicles at intersection in
a pre timed slot manner. This pre-timed controller approach fails to minimize the waiting time of vehicles at the
traffic intersection as it doesn’t consider the arrival time of vehicles. To overcome this problem an adaptive and
intelligent traffic control system is proposed in such a way that a traffic signal controller with wireless radio
installed at the intersection and it is considered as an infrastructure. All the vehicles are equipped with onboard
location, speed sensors and a wireless radio to communicate with the infrastructure thereby VANET is formed.
Once the vehicles enter into the boundary of traffic area, they broadcast their positional information as data
packet with their encapsulated ID in it. The controller at the intersection receives the transmitted packets from
all the legs of intersection and then stores it in a temporary log file. Now the controller runs Platooning
algorithm to group the vehicles approximately in equal size of platoons. The platoons are formed on the basis of
data disseminated by the vehicles. Then the controller runs Oldest Job First algorithm which treats platoons as
jobs. The algorithm schedules jobs in conflict free manner and ensures all the jobs utilize equal processing time
i.e the vehicles of each platoons cross the intersection at equal delays. The proposed approach is evaluated
under various traffic volumes and the performance is analyzed.
Keywords Conflict graphs, online job scheduling, traffic signal control, vehicular ad hoc network (VANET)
simulation, vehicle-actuated traffic signal control, Webster’s algorithm.
The need for TVE is increasing as a result of so many factors: technological advancement,
globalization process, knowledge economy, changes in modes of production in the work place, growing
economic openness and competitiveness. TVE is very vital to the sustenance of technological development of
every nation in the present 21st century. For Nigeria to become developed greater emphasis must be placed on
technology education in order to improve on its quality for sustainable national development. This paper
discussed extensively on quality assuranceon TVE for sustainable national development in the 21st century. The
paper highlights on the concept of TVE and discusses on the status of TVE in Nigeria. Issues on sustainable
development and rationale for enhancing the quality of TVE in Nigeria in the 21st century were explained.
Conclusions were drawn and recommendations made amongst which are that: Government should introduce
sustainable financing scheme for TVE and increase the percentage of total expenditure on education to TVE and
also grant financial aids to trainees who are interested in pursuing TVE programs at whatever level and also
the involvement of major Nigerian stakeholders in the provision of workshop tools, equipment and other
infrastructural facilities for TVE graduates skills acquisition for sustainable national development.
A Novel Approach of Area-Efficient FIR Filter Design Using Distributed Arithm...IOSR Journals
Abstract: In this paper, a highly area-efficient multiplier-less FIR filter is presented. Distributed Arithmetic (DA) has been used to implement a bit-serial scheme of a general asymmetric version of an FIR filter, taking optimal advantage of the 3-input LUT-based structure of FPGAs. The implementation of FIR filters on FPGA based on traditional arithmetic method costs considerable hardware resources, which goes against the decrease of circuit scale and the increase of system speed. This paper presents the realization of area efficient architectures using Distributed Arithmetic (DA) for implementation of Finite Impulse Response (FIR) filter. The performance of the bit-serial and bit parallel DA along with pipelining architecture with different quantized versions are analyzed for FIR filter Design. Distributed Arithmetic structure is used to increase the resource usage while pipeline structure is also used to increase the system speed. In addition, the divided LUT method is also used to decrease the required memory units. However, according to Distributed Arithmetic, we can make a Look-Up-Table (LUT) to conserve the MAC values and callout the values according to the input data if necessary. Therefore, LUT can be created to take the place of MAC units so as to save the hardware resources. The simulation results indicate that FIR filters using Distributed Arithmetic can work stable with high speed and can save almost 50 percent hardware resources to decrease the circuit scale, and can be applied to a variety of areas for its great flexibility and high reliability. This method not only reduces the LUT size, but also modifies the structure of the filter to achieve high speed performance. Keywords: DSP, Digital Filters, FIR , FPGA, MAC, Distributed Arithmetic(DA),Divided LUT, pipeline
The Performance Analysis of a Fettling Shop Using SimulationIOSR Journals
Fettling shop is the product finishing shop of casting products.After the knockout, the casting is taken
to the fettling shop for doing the fettling work. The fettling process includes cutting, shot blasting, grinding and
painting. In all these process the sand and extra metal on the castings are removed. The project titled „The
performance analysis of a fettling shop using simulation‟ is based on a fettling shop of a casting industry. The
main aim of the project is the performance analysis of the fettling shop. This project is a simulation based
project and is done using a simulation tool called arena. The main concepts related with the performance
analysis are Bottleneck analysis, Productivity analysis and System improvement analysis.
A Comparative Study on Balance and Flexibility between Dancer and Non-Dancer ...IOSR Journals
Abstract: Dance is a form of art that normally involves rhythmic movement of the body and accompanied with
music. Movement of human body while performing dance can become a significant medium for communication,
feelings and emotions. It embraces movement, creation and performance. Dance helps to extend the limits of
human physical ability, expressiveness and spirit. When it comes to health dance can be a very effective way of
establishing a lasting healthy living. Anecdotally it can be said that dance potentially motivate and excite young
people. Dance is a non-competitive form of exercise which has positive effects on physical and mental health.
Young girls can be engaged in physical activity through dance. The author being a dancer in fervor and passion
as well as an aspirant of the profession Physical Education strived to conduct the study bearing the title “A
Comparative Study on Balance and Flexibility between Dancer and Non-Dancer Girls”. The researcher
selected 30 girls who are regularly involved in Dance and 30 girls who are non-dancer or rather sedentary on
the basis of purposive stratified random sampling from Bidhan Govt. Girl’s School, Dist. Nadia West Bengal as
the subjects of her study. She incorporated Sit and Reach test and Stork Stand Balance tests for assessment of
Flexibility and Balance respectively. With respect to data analysis initially descriptive statics like mean SD and
range and further paired sample T test was conducted to ascertain the degree of difference between the means
with the help of SPSS soft ware. Data analysis proved significant difference between the Dancer and NonDancer
girls both with respect to flexibility and Balance. In both the cases the Dancer girls proved to be better
though the differences were not statistically significant. Thus the author arrived at the conclusion that dance
involving passion, strength, stamina, enthusiasm, rhythm, amusement and many more could be a wonderful
fitness activity similar to other fitness activities like jogging, running, cycling, swimming etc.
Key words: Dance, Flexibility, Balance, Dancer, Non-Dancer.
Performance Evaluation of IEEE STD 802.16d TransceiverIOSR Journals
WiMAX ("Worldwide Interoperability for Microwave Access") technology is developed to meet the
growing demand of increased data rate and accessing the internet at high speeds. 802.16 family of standards is
officially called Wireless MAN in IEEE. Orthogonal frequency division multiplexing (OFDM) is multicarrier
modulation technique used in IEEE 802.16d (fixed WiMAX) communication standard. OFDM is used to
increase data rate of wireless medium with higher spectral efficiency. The proposed work is to evaluate
performance of IEEE Std 802.16d transceiver in MATLAB R2009b simulink environment. System performance
evaluated using BER vs SNR for different modulation technique such as 4 QAM, 16 QAM, 64 QAM under
different channel condition
A Study on the Relationship between Nutrition Status and Physical Fitness of ...IOSR Journals
Abstract: Nutritional status during school age is a major determinant of nutritional and health status in adult
life. Many studies showed that under nutrition and anaemia had an adverse impact on performance and
consequently led to reduction in wages for persons employed in manual labour.
The past three decades have witnessed the emergence of over nutrition as a problem in school-age children in
developed countries and in affluent urban segments in developing countries. The main determinants of
performance are physical fitness and skill. Longitudinal studies have shown that the lifestyle and physical
fitness during childhood and adolescence were major determinants of lifestyle, physical fitness and freedom
from non-communicable diseases in adult life.
Determination of Propagation Path Loss and Contour Map for FUTA FM Radio Fede...IOSR Journals
FM signal propagation through the troposphere interacts with the terrain as obstacles and reflection
planes. To understand the degree of interaction, signal strength measurements of the 93.1MHz frequency
modulated Radio located at Federal University of Technology; Akure, Nigeria was carried out in the area
surrounding the station. The paper reviews the various models for predicting transmission loss and employed
the long rice irregular terrain model for its versatility for the study. The losses along the paths were determined
and this was compared with the path loss predicted by the irregular terrain model and this was highly
correlated. The result offers useful data for developing the contour map of the propagation loss which was
developed for the station. It was concluded that with the irregular terrain model predictions can be used for
accurate spectrum management in Nigeria
Gc-Ms Analysis and Antimicrobial Activity of Essential Oil of Senecio Peduncu...IOSR Journals
The chemical composition of the essential oil obtained from the leaves of Senecio pedunculatus collected from the Kumaon region of Uttarakhand, was analyzed by GC-MS. The major constituent was found out to be caryophyllene oxide (23.28%). The antibacterial and antifungal activity of the oil was determined by disc diffusion method. Results showed that the oil exhibited mild antimicrobial activity.
A optimized process for the synthesis of a key starting material for etodolac...IOSR Journals
Abstract An optimized process developed for the synthesis of 7-ethyltryptophol, a key starting material for etodolac, a non steroidal anti- inflammatory drug. Starting from commercially available 2-ethylphenylhydrazine. HCl and dihydro furan with con. H2SO4 as a catalyst in N, N- dimethyl acetamide ( DMAc). H2O (1:1) as a solvent in 75% yield . the method is easy, inexpensive , without purification getting pure solid. The process is very clean, high yielding & high quality and operationally simple.
Keywords: Etodolac, 7-ethyl tryptophol, 2-ethyl phenyl hydrazine hydrochloride, N,N-dimethyl acetamide.
Measurement of Efficiency Level in Nigerian Seaport after Reform Policy Imple...IOSR Journals
This paper focuses on the impact of reforms on port performance using Onne and Rivers ports as a reference point. It analyses the pre and post reform eras of the ports in terms of their performance. The reforms took effect from 1996 after the Federal Government of Nigeria concessioned the ports to private investors. Parameters such as Ship traffic, Cargo throughput, Ship turn round time, Berth Occupancy and personnel were used as variables for the assessment. Secondary Data were collected from the Nigerian Ports Authority and Integrated Logistic Services Nigeria (Intels) for the period 2001 to 2010 and analyzed using Data Envelopment Analysis to assess the efficiency of the port. Analysis revealed a continuous improvement in the overall efficiency of both Ports Since 2006 when the new measure was introduced. Average Ship turn-around time improved in the ports due to modern and fast cargo handling equipment and more cargo handling space which were provided. There is an increase in Ship traffic calling at the ports, resulting in increased cargo throughput and berth occupancy rate at ports of Onne and Rivers. The reform also led to more private investment in the ports’ existing and new facilities and the introduction of a World Class service in port operation. This study concludes that the Ports of Onne and Rivers are performing better under the reform programme of the Federal Government of Nigeria. It finally recommends the urgent need for a regulator to appraise the performance of the reform programme from time to time as provided by the agreement and for the full adoption and utilization of management information system (MIS) to aid performance efficiency.
Determining Tax Literacy of Salaried Individuals - An Empirical AnalysisIOSR Journals
In personal financial planning, tax management plays a very important role. An individual should have thorough knowledge of various aspects of taxes and tax policies, which would help him to understand how much he can save even after paying taxes. Those people who have not taken any formal course on taxation finds it difficult to understand and comprehend the issues related to determination of tax liability, tax filling and tax saving. An attempt has been made through this paper to determine tax literacy level of salaried individuals based on various demographic and socio-economic factors. Findings of the study suggest that overall tax literacy level of respondents is not very high. The results suggest that level of tax literacy varies significantly among respondents. Also tax literacy level gets affected by gender, age, education, income, nature of employment and place of work whereas it does not get affected by geographic region. Findings of this paper suggest that government should adopt more aggressive approaches to educate taxpayers, thereby raising the level of tax literacy among them.
This ppt is made for making the topic clear. The aim is to make available content regarding thermocouple which is available on various sites. This ppt is made only for study purposes. The author doesn't claim originality of the content.
The thermocouple can be defined as a kind of temperature sensor that is used to measure the temperature at one specific point in the form of the EMF or an electric current. This sensor comprises two dissimilar metal wires that are connected together at one junction. A Thermocouple is a sensor used to measure temperature. Thermocouples consist of two wire legs made from different metals. The wires' legs are welded together at one end, creating a junction. The voltage can then be interpreted using thermocouple reference tables to calculate the temperature.The temperature can be measured at this junction, and the change in temperature of the metal wire stimulates the voltages. These are used as the temperature sensors in thermostats in offices, homes, offices & businesses.
These are used in industries for monitoring temperatures of metals in iron, aluminum, and metal.
These are used in the food industry for cryogenic and Low-temperature applications. Thermocouples are used as a heat pump for performing thermoelectric cooling.
These are used to test temperature in the chemical plants, petroleum plants. These are used in gas machines for detecting the pilot flame.
Post-buckling analysis of a simply supported compound beams made of two symme...IOSR Journals
Thermal post buckling analysis of axi symmetric compound stepped beams, made of two different
materials with axially immovable ends, for simply supported conditions, and was studied numerically. The
analysis was performed by using the energy principle. The compound beam is made of two different materials,
with the end segments of equal lengths of the same material with a higher, and the central segment of a different
length of another material with lower coefficients of linear thermal expansion. Similarly, the Young’s modulus of
the material of the middle segment is higher than that of the symmetrically placed end segments. The buckling
and post buckling strength of stepped compound beam is predicted by examining the influence of inertia, length
and deflection ratios. As mentioned in the title of the present work, importance is given for predicting the non
dimensional post buckling parameters for the two different material combinations such as steel-aluminum,
titanium-aluminum and copper-aluminum as these combinations of materials finds a major applications in the
fields of aerospace, electronic, power generation and automobile industry where high strength and low weight
are desirable.
For post buckling analysis, the accuracy and efficiency of the present method for a isotropic uniform beam with
simply supported and fixed-fixed boundary conditions, have shown a good agreement with that of obtained by
finite element method.
Iron losses in ferromagnetic enclosures of gas-insulated transmission lines u...Power System Operation
The enclosure of AC gas-insulated transmission lines
(AC-GIL) is ordinarily made of aluminium. In HVDC
systems, it can be economically and technically
reasonable to manufacture the enclosure of GIL from
steel. To check the feasibility to operate such DC-GIL
even under AC the relevant losses in the steel enclosure
must be known.
The present paper compares three different methods to
determine the specific iron losses of steel when exposed
to magnetic fields with power frequencies. The iron
losses as a function of the magnetic field strength are
measured with a pipe sample in a coaxial conductor
arrangement, a pipe sample in a toroidal core test and
with relevant strips in an Epstein frame. The results
from the three test methods are found to be in close
agreement. By calculating the iron losses in a GIL with
steel enclosure the reduction of the transmission capacity
is estimated when changing from DC to AC operation.
Influence of Interface Thermal Resistance on Relaxation Dynamics of Metal-Die...A Behzadmehr
Nanocomposite materials, including noble metal nanoparticles embedded in a dielectric host medium, are interesting because of their optical properties linked to surface plasmon resonance phenomena. For studding of nonlinear optical properties and/or energy transfer process, these materials may be excited by ultrashort pulse laser with a temporal width varying from some femtoseconds to some hundreds of picoseconds. Following of absorption of light energy by metal-dielectric nanocomposite material, metal nanoparticles are heated. Then, the thermal energy is transferred to the host medium through particle-dielectric interface. On the one hand, nonlinear optical properties of such materials depend on their thermal responses to laser pulse, and on the other hand different parameters, such as pulse laser and medium thermodynamic characterizes, govern on the thermal responses of medium to laser pulse. Here, influence of thermal resistance at particle-surrounding medium interface on thermal response of such material under ultrashort pulse laser excitation is investigated. For this, we used three temperature model based on energy exchange between different bodies of medium. The results show that the interface thermal resistance plays a crucial role on nanoparticle cooling dynamics, so that the relaxation characterized time increases by increasing of interface thermal resistance.
Electrical discharge machining is basically a non-conventional material removal process which is widely used to produce dies, punches and moulds, finishing parts for aerospace and automotive industry, and surgical components. This process can be successfully employed to machine electrically conductive parts irrespective of their hardness, shape and toughness.
Multi-Physics Analysis of a Refractory Metal ACOperated High Temperature Heat...SIMULIA
Electrically operated high temperature furnaces and reactors are used in many industrial manufacturing processes such as sintering or single crystal growth in order to allow for the required process conditions. In view of their outstanding characteristics refractory metals are ideally suited as materials for the resistive heating elements. Nevertheless, significant and lifetime- limiting irreversible deformations of these elements can be frequently observed which are assumed to be caused by a combination of temperature expansion, electromagnetic forces, and high temperature creep effects. In order to study this undesired behavior, a multi-physics model of a particular three-phase AC heating element of a sintering furnace is formulated and implemented within Abaqus. It accounts for the primary involved coupled physical mechanisms such as the harmonic electrical field problem, the thermal problem governed by Joule's law, thermal expansion, high temperature creep and harmonic forces caused by the electromagnetic field along with field dependent constitutive behavior. Since in general solving the fully coupled problem on a 3D domain is computationally demanding and Abaqus lacks functionality in the field of electromagnetism, a semi-analytical approach for consideration of time-harmonic electromagnetic forces within mechanical analysis is developed in the present work. The model implemented as a userdefined extension for Abaqus is computationally very attractive since it avoids discretization of the medium surrounding the heater. Furthermore, some aspects of modeling coupled physical problems of different characteristic time-scale are briefly discussed. Results from application of the model are in good qualitative agreement with in-situ observations and confirm the relevance of considering electromagnetic forces within analysis of high temperature furnaces.
Experimental and Finite Element Analysis of Single-V Groove Butt Weld on Weld...IJSRD
Gas Tungsten Arc Welding Process (GTAW) is widely used in fabrication of Aluminium and Aluminium Alloy material when precision is considered as a prime importance. Deformations in the object undergoing welding are one of the foremost problems encountered in the welding industry. Thus it is often required to study the factors which affect the deformations produced during welding to avoid errors in the geometry. Present investigation highlights Experimental and Finite Element Analysis of a Single-V Groove Butt Weld on Weld Pool Geometry of Aluminium Alloy Plate under Different Joint Parameters.Finite Element Method (FEM) has been employed to do the transient thermal and structural analysis of the assembly. The Finite Element Analysis has been done on ANSYS 14.5 Workbench. Number of factors is liable to produce effects in the job during the welding operation. Aim of this paper is the effect of welding parameters like as welding current, shielding gas flow rate and welding speed with mechanical Properties like tensile strength and hardness. After that finite element analysis for temperature distribution and distribution of the stresses in the welded Aluminium alloy plate. The results show that the larger the Welding current and smaller welding speed will lead to the maximum residual tensile stress. Therefore a residual stress will arise from the restraint position. The ultimate residual stress of weldment is determined by material yield strength at different temperature. The higher yield strength at different temperature has higher material residual stress. Because of its higher thermal conductivity, aluminium alloy test specimens have small temperature differential.
Characterization of Mechanical, Thermal, and Electrical Properties of Carbon ...drboon
In this paper, the mechanical, thermal and electrical properties of carbon fiber modified thermoplastic polyimide were numerically analyzed by finite element analysis. A three-dimensional model was created, in which continuous carbon fibers are aligning and paralleling to each other and uniformly distributing in the polymer matrix. The behaviors of the composites in two extreme situations, i.e., parallel or perpendicular to carbon fiber direction, were simulated. The effects of the volume fraction of carbon fiber content on the physical properties were investigated. It shows clearly that carbon fibers significantly improve the mechanical strength, and thermal and electrical conductivities. The future work includes investigation of the physical properties of the conductive network of the composites with random carbon fiber orientation, and different fillers, such as graphite, and carbon nanotubes.
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
"Impact of front-end architecture on development cost", Viktor TurskyiFwdays
I have heard many times that architecture is not important for the front-end. Also, many times I have seen how developers implement features on the front-end just following the standard rules for a framework and think that this is enough to successfully launch the project, and then the project fails. How to prevent this and what approach to choose? I have launched dozens of complex projects and during the talk we will analyze which approaches have worked for me and which have not.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
Search and Society: Reimagining Information Access for Radical FuturesBhaskar Mitra
The field of Information retrieval (IR) is currently undergoing a transformative shift, at least partly due to the emerging applications of generative AI to information access. In this talk, we will deliberate on the sociotechnical implications of generative AI for information access. We will argue that there is both a critical necessity and an exciting opportunity for the IR community to re-center our research agendas on societal needs while dismantling the artificial separation between the work on fairness, accountability, transparency, and ethics in IR and the rest of IR research. Instead of adopting a reactionary strategy of trying to mitigate potential social harms from emerging technologies, the community should aim to proactively set the research agenda for the kinds of systems we should build inspired by diverse explicitly stated sociotechnical imaginaries. The sociotechnical imaginaries that underpin the design and development of information access technologies needs to be explicitly articulated, and we need to develop theories of change in context of these diverse perspectives. Our guiding future imaginaries must be informed by other academic fields, such as democratic theory and critical theory, and should be co-developed with social science scholars, legal scholars, civil rights and social justice activists, and artists, among others.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
1. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE)
e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 12, Issue 5 Ver. II (Sep. - Oct. 2015), PP 75-80
www.iosrjournals.org
DOI: 10.9790/1684-12527580 www.iosrjournals.org 75 | Page
Analysis of Electro-thermal Stress and Strain in a Functionally
Graded Metal Line under Direct Current Field
Anjan Goswami1
, Md. Rejaul Haque2
, A. K. Ghosh3
1,2,3
(Dept. of Mechanical Engineering, Bangladesh University of Engineering and Technology, Bangladesh)
Abstract: In this study, the electro-thermal stress and strain of a thin, non-uniform functionally graded metal
(FGM) line is analyzed under a direct current field. The material properties of the metal line are assumed to
vary over the span following a linear functional relationship. The governing differential equations associated
with the electro-thermal problems are derived in terms of variable electrical resistivity, thermal conductivity,
co-efficient of thermal expansion and the modulus of elasticity of the material. The solution of the coupled
boundary-value problem is then obtained numerically by using finite-difference technique. The thermal stress
and strain distributions in the FGM line are determined for different environmental conditions and electric field
intensities, which are discussed in light of comparison with those of individual constituent metal lines. The
results are claimed to be accurate and reliable as good conformity is found with the theoretical predictions.
Keywords – DC field, Functionally graded metal, Finite difference method, Thermal stress, Thermal strain.
I. Introduction
Understanding the electro-thermal responses of different conducting materials facilitate the integrity
assessment as well as effective manipulation capability in material selection for modern micro-electronic
devices. To meet the requirements of extreme performance under various complex working conditions, pure
metals are being replaced by different kinds of advanced materials, such as, alloys, composites and functionally
graded materials (FGM) [1, 2]. FGM is characterized by a gradual change in material properties over volume. It
is an anisotropic composite material where a material gradient has been deliberately introduced over two (or
more) different materials and the overall properties of FGMs are clearly different from any of the constituent
materials that form it.. FGMs offer great promise to meet a wide range of engineering applications since the
compositional gradients can be tailored towards specific requirements [2].
When field current flows through an electrical conducting material, Joule heating is induced, which
eventually leads to the generation of heat in the conductor. This electro-thermal conduction ultimately causes
thermal stress in the materials, which is considered to be one of the major reasons of metal line failure in
electronic packaging [3]. Carslaw and Jaeger [4], theoretically explained the problem of heat conduction in a
wire under the influence of current flow. Considering temperature dependent material properties Greenwood
and Williamson [5] treated the case of a conductor subjected to a direct current flow. The method was further
extended by Jang et al. [6] to give a general solution to the coupled nonlinear problem of steady-state electrical
and thermal conduction across an interface between two dissimilar half spaces. Introducing a new Joule heating
residue vector, heat conduction in symmetrical electro-thermal problems has been analysed under the influence
of direct current passing through symmetrical regions of the boundary [7]. Further, a nonlinear analysis has been
reported for predicting the electro-thermal response of a metallic wire composed of dissimilar materials with
temperature dependent thermal conductivity [8]. The resulting temperature field of a 2D electro-thermal
problem near the corner composed of two dissimilar materials in an angled metal line has been analysed under a
direct current flow [9]. Recently, the effect of material composition distributions on electro-thermal responses of
FGM lines under a direct current field have been analyzed by Ghosh et al. [10]. The analytical solution for the
thermal stresses of FGMs in the one-dimensional case for spheres and cylinders are given by Lutz and
Zimmerman [11, 12].
This paper focuses on the of thermal stress and strain distribution in a thin, non-uniform FGM metal
line under direct current field. The electrical, thermal and other metallic properties of the Cu-Al FGM line are
assumed to vary over the line following a linear relationship. A metal line having converging-diverging shape
with variable rectangular cross section is modeled to represent the geometrical non-uniformity. The numerical
solutions of the present coupled multi-physics problem are obtained using a finite-difference computational
scheme. The distributions of thermal stress and strain in the FGM line are presented for different environmental
conditions and electric field intensities as well.
2. Analysis of Electro-thermal stress and Strain in a Functionally Graded Metal line Under DC Field
DOI: 10.9790/1684-12527580 www.iosrjournals.org 76 | Page
II. Mathematical Formulation
2.1 Electrical problem
The differential equation that governs the distribution of electric potential in a non-uniform metal line
with variable electrical resistivity is as follows:
2
2
( ) ( )
( ) ( )
d d x d J x
J x x
dx dx dx
(1)
where, φ is electric potential in V, ρ is the electrical resistivity in Ωm, J is current density in Am-2
respectively.
For uniform cross-sectional area and constant electrical resistivity, the derivatives in the right hand side
of the Eq. (1) can be neglected. Equation (1) will then be reduced to the standard one dimensional Laplace
equation. The end conditions of the metal line are simulated by the following relation of potential gradient:
d φ I
ρ
dx A
(2)
where, I is the field intensity in Amps and A is the area in m2
. The negative sign of the equation (2)
applies to the line end where current is being injected and the positive sign corresponds to the current outlet
port.
2.1 Thermal problem
The general governing equation for steady state heat transfer in a metal line, the surface of which losses
heat by convection to the surrounding atmosphere (Tα) is as follows:
1 ( )
( ) ( ) [ ] ( ) 0
( ) ( )
T H C x
A x k x T T G x
A x x x A x
(3)
where, T denotes temperature in K and Tα is the ambient temperature in K; k is the thermal conductivity
in Wm-1
K-1
, H is convective co-efficient in Wm-2
K-1
, C is perimeter in m and G is volumetric heat generation in
Wm-3
respectively.
For the present electro-thermal problem, the heat generation rate per unit volume (G) is related to Joule
heating caused by the current flow. For steady-state heat transfer in the metal line with variable thermal
conductivity k(x), subjected to Joule heating, the governing equation becomes:
2
1 ( ) 1
( ) ( ) [ ] 0
( ) ( ) ( )m
d dT H C x d
A x k x T T
A x dx dx A x A x dx
(4)
where, Am is mechanical equivalent of heat in jcal-1
. For the thermal problem, the temperatures at the
two ends of the line are assumed to be known. It is mentioned that all possible physical conditions at the ends
can readily be accommodated in the present program.
Temperature changes cause the body to expand or contract. If the temperature deformation is not
permitted to occur freely an internal stress is created defined as thermal stress and expressed as follows:
E (5)
where, σ represents the thermal stress in MPa and ε is the thermal strain in mm/mm and; E denotes the
modulus of elasticity of the metal in MPa. The thermal strain is related to the change in temperature of the metal
as:
T (6)
here, α is the co-efficient of thermal expansion in m/m-K
III. Statement Of Thermal Problem Coupled With An Electrical Field
The analytical model of a variable cross-section FGM metal line with overall dimensions, L = 200 mm,
w1 = 5 mm, w2 = 1 mm, t = 100 μm, which is subjected to a steady direct current field is shown in Fig. 1. The
current flow is assumed to be, I = 1 A. The FGM line is assumed to be composed of two metals (Cu and Al), the
composition of which varies linearly over the line span (x = 0 ~ L).
The entire metal line is assumed to be electrically insulated except for the two ends. For the
solution of electrical problem, in addition to the given current densities at the two ends of the line, the zero
potential condition is also satisfied at its mid-length position. For the thermal problem, the elevated temperature
3. Analysis of Electro-thermal stress and Strain in a Functionally Graded Metal line Under DC Field
DOI: 10.9790/1684-12527580 www.iosrjournals.org 77 | Page
Condition of the metal line was simulated by assigning a fixed temperature (313 K) at two ends of the metal
line. The surface of the line is assumed to transfer heat by convection to the surrounding environment which is
kept at a temperature of 310 K. The convection heat transfer co-efficient is assumed to be constant (10 Wm-2
K-1
)
for the entire span of the FGM line.
The metal line is assumed to be fixed at both ends which do not permit the thermal expansion and
results thermal stress inside the metal. Another consideration is that the metal was in thermal equilibrium with
the environment before the starting of current flow. Hence, the initial temperature of the FGM line is equal to
temperature of the environment, Tα (310K).
The individual electrical resistivity, thermal conductivity, thermal expansion co-efficient and elastic
modulus of the two constituent metals (Cu and Al) assumed for the present analysis are listed in Table 1.
Figure 1: Model of a thin, non-uniform FGM line under direct current field
Both the material properties of interest are assumed to vary following a linear law along the length of
the FGM line, which are as follows:
(x) = Cu + (Al Cu) (x/L) (7)
k (x) = kCu + (kAl kCu) (x/L) (8)
α(x) = αCu + (αAl αCu) (x/L) (9)
E (x) = ECu + (EAl ECu) (x/L) (10)
Table 1: The assumed electric, thermal and material properties of Copper and Aluminum at room temperature.
Metal
Electrical resistivity
(Ω-m)
Thermal
conductivity
k (Wm-1
K-1
)
Co-efficient of
thermal expansion
(m/m-k)
Modulus of
elasticity E (Pa)
Copper (Cu) 1.71×10-8
400.35 17×10-6
117×109
Aluminum (Al) 2.65×10-8
238.97 23.1×10-6
70×109
IV. Solution Methodology
Using finite-difference technique the present steady state heat conduction-convection boundary-value
problem has been solved numerically. Both the governing differential equations associated with the electrical
and thermal problems are discretized using the standard three-point central-difference scheme. The difference
equations so developed for the electrical and thermal problems are respectively as follows:
)(
2
2 111111 iiiiiiiii JJJ
h
(11)
2
11
1121
11111
1
21
11111
1
4]4[
]48[]4[
iimiiiiiiiiiii
iiiiiiiiiiii
AThCHATkkAAAkk
ThCHAkTkkAAAkk
(12)
( )i i iT T (13)
i i iE (14)
4. Analysis of Electro-thermal stress and Strain in a Functionally Graded Metal line Under DC Field
DOI: 10.9790/1684-12527580 www.iosrjournals.org 78 | Page
A computer code was developed using MATLAB to solve the present coupled electro-thermal model.
The resulting tri-diagonal systems of algebraic equations are solved by the matrix decomposition method. For
the calculation of secondary parameters of density, electrical heat generation, etc., both the three-point forward
and backward as well as central differencing schemes were adopted to keep the order of error the same (O(h2
)).
A total of 1000 nodal points have been considered to discretize the computational domain. The convergence as
well as the stability of the numerical solution has however been verified by varying the nodal points from 25 to
1500.
V. Results And Discussion
The electro-thermal responses of a FGM metal line (Cu-Al) subjected to a direct current field is
described in this section. Fig. 2 shows the variation of thermal stress along the metal lines under two different
conditions, which are in fact bare and buried lines. In attempt to compare the thermal response of FGM metal
line with those of individual Cu and Al lines, the corresponding thermal stress distribution is presented together
with those of the individual Al and Cu lines (see Fig. 2). For the individual metal lines, the distributions are
found to be symmetric about the mid-length position, at which the maximum stress is developed. However, this
is not the case for the FGM line, in which the maximum stress position is shifted slightly towards the right from
its mid-length position. Fig. 2(b) describes the corresponding thermal stress variations for the case of buried
metal lines which are found to be very similar to those of bare lines in terms of nature of variation, but they
differ quite significantly in the sense of magnitude. This is quite logical because, in case of buried lines, no heat
loss is allowed from their surfaces through convection to surroundings, thereby shifting the overall state of
thermal stress to a higher level compared to the case of bare lines.
Axial Position, x/L
0.0 0.2 0.4 0.6 0.8 1.0
Thermalstress,MPa)
0
5
10
15
20
25
Cu
FGM
Al
Axial Position, x/L
0.0 0.2 0.4 0.6 0.8 1.0
Thermalstress,MPa)
0
5
10
15
20
25
Cu
FGM
Al
Figure 2: Thermal stress distribution along the FGM lines: (a) bare lines; (b) buried lines
The variation of generated thermal strain is presented in Fig. 3 as a function of axial location of lines.
The strain distributions for the FGM metal line resides in between those of the parent metals, and maintain
higher similarities with that of Cu for the starting section and Al for the end section. This is because the
proportion of Cu is higher for the first half section and Al is higher for the last half section. Like thermal stress
distribution in case of FGM metal line the maximum strain does not occur at the mid-length position, shifted
slightly toward the right from its mid-length. Also the overall state of thermal strain for buried lines (see Fig. 3)
shifted to a higher level compared to the case of bare lines.
Axial Position, x/L
0.0 0.2 0.4 0.6 0.8 1.0
ThermalStrain,x104
(mm/mm)
0
1
2
3
4
Cu
FGM
Al
Axial Position, x/L
0.0 0.2 0.4 0.6 0.8 1.0
ThermalStrain,x104(mm/mm)
0
1
2
3
4
Cu
FGM
Al
Figure 3: Thermal strain distribution along the FGM lines: (a) bare lines; (b) buried lines
(a) (b)
(a) (b)
5. Analysis of Electro-thermal stress and Strain in a Functionally Graded Metal line Under DC Field
DOI: 10.9790/1684-12527580 www.iosrjournals.org 79 | Page
The effect of electric field intensity on the thermal stress generation for both bare and buried metal
lines is demonstrated in Fig. 4. Both the conditions show a significant increase in developed thermal stress with
the increase of current flow. It is also found that the stress development under buried condition (Fig. 4(b)) is
much higher compared to that of bare line (Fig. 4(a)).
Axial Position, x/L
0.0 0.2 0.4 0.6 0.8 1.0
Thermalstress,Pa
0
10
20
30
40
50
60
I = 1 A
I = 1.5 A
I = 2 A
Axial Position, x/L
0.0 0.2 0.4 0.6 0.8 1.0
Thermalstress,Pa
0
10
20
30
40
50
60
I = 1 A
I = 1.5 A
I = 2 A
Figure 4: Effect of field intensity on thermal stress distribution: (a) bare lines; (b) buried lines
Axial Position, x/L
0.0 0.2 0.4 0.6 0.8 1.0
Thermalstrain,x
(mm/mm)
0
1
2
3
4
5
6
7
I = 1 A
I = 1.5 A
I = 2 A
Axial Position, x/L
0.0 0.2 0.4 0.6 0.8 1.0
Thermalstrain,x
(mm/mm)
0
1
2
3
4
5
6
7
I = 1 A
I = 1.5 A
I = 2 A
Figure 5: Effect of field intensity on thermal strain distribution: (a) bare lines; (b) buried lines
Fig. 5 shows how electric field intensity affects thermal strain along metal lines for both bare and
buried conditions. Like thermal stress distribution a significant increase in developed thermal strain due to
increase in field intensity is revealed. The numerical results are found to be in good conformity with the
expectation, because thermal stresses are proportional to corresponding thermal strains. And also it is to be
noted that in our metal line, for all cases maximum stress and strain values are found near the mid-section of the
metal lines where the cross sectional area is minimum.
The mesh sensitivity analysis of the present computational scheme is shown in Fig. 6. The same
computational domain of the FGM line is discretized with various numbers of nodes varying from 25 to 1500.
The solution of the problem, i.e. the maximum thermal stress developed in the FGM line is plotted against the
number of the nodes used to discretize the domain. It is observed that, for lower values of nodes, the magnitude
of maximum thermal stress decreases with the increase of node numbers to a lowest value. Then for a range of
node numbers thermal stress varies in gradual increasing and decreasing nature. But as the number of nodes
goes to a value over 290, the value of maximum thermal stress generation becomes independent of the node
numbers and the curve becomes flat. This convergence is an indication of stable solution for these values of
node numbers.
(a) (b)
(a) (b)
6. Analysis of Electro-thermal stress and Strain in a Functionally Graded Metal line Under DC Field
DOI: 10.9790/1684-12527580 www.iosrjournals.org 80 | Page
Number of nodes
25 150 275 400 525 650 775 900
max(MPa)
18.1
18.2
18.3
18.4
18.5
18.6
18.7
18.8
Figure 6: Maximum stress developed in the FGM line as a function of nodal points
VI. Conclusion
Variation of thermal stress and strain due the effect of direct current field in a thin, non-uniform FGM
metal composed of two metals (Al and Cu) is investigated. It is observed that the distribution of the associated
material properties of the resulting metal line is assumed to be linear functions of the spatial coordinate. The
magnitude of the thermal stress and strain as well as their nature of distributions differs significantly from those
of the individual constituent metal lines. The intensity of the electric field plays a quite substantial role in stress
and strain development. Based on the findings it can be concluded that this analysis provides a reliable guideline
to predict the performance of functionally graded metal lines in electronic devices and to develop effective FGM
metal lines as well.
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