This document summarizes the design and simulation of a fractal micro-transformer. The researchers designed an air-core fractal micro-transformer using finite element modeling software. Simulation results showed improved performance parameters compared to macro transformers, including higher voltage gain. Electric displacement and magnetic energy density within the micro-transformer were determined to be 2 x 10-11 C/m2 and 100 J/m3 respectively. Losses within the air-core design were minimal at 3 W/m3. The micro-transformer was concluded to be suitable for integration in MEMS and VLSI applications due to its small size, high impedance, and isolation capabilities.
Design of Integrated LC Filter Using Multilayer Flexible Ferrite Sheets iosrjce
Dielectric and magnetic materials were developed for use as integrated passive component design.
The integrated LC component to be investigated in this paper uses ferrite material which combines both
magnetic and dielectric properties. Because of this double property, the ferrite sheet will be used in this design
as magnetic core for the inductor and dielectric substrate for the capacitor. The fabrication is simplified by
using PCB inductor and adhesive flexible ferrite sheet. To evaluate the inductance, the capacitance including
the parasitic resistance, a fabricated prototype of the LC component was simulated and measured. It was
confirmed that simulated values were very close to the measured values and the integrated LC component
behaves as low-pass filter
Reduced Dielectric Losses for Underground Cable Distribution SystemsIJAPEJOURNAL
This paper describes the process to reduce dielectric losses for underground cable distribution system. As already known, that system is an alternative solution to energy distribution systems in urban areas. Influence of large capacitance is a separate issue that needs to be resolved.
Large capacitance effect on Express Feeder of 10 miles long has resulted in power losses more than 100 MW per month. In the no-load condition, current dispatch has recorded 10 Amperes, and has increased the voltage at receiving end by 200-500 Volts, with leading power factors.
Installation of the inductor to reduce cable loss dielectrics is done by changing the power factor (pf) to 0.85 lagging. After installation of the inductor, which is 5 mH/700 kVAR, dielectric losses is reduced to 3.57%, which is from 105,983 kW to 102,195 kWh per month. The capacitive leakage current has also been reduced from 249.61 Ampere to 245.17 Ampere.
Effect of Temperature and Nickel Concentration on the Electrical and Dielectr...IJERD Editor
In this paper the effect of temperature range of 298 K to 348 K and volume filler content ф on
electrical properties of polyethylene PE filled with nickel Ni powders has been investigated .The volume
electrical resistivity
V
of such composites decreases suddenly by several orders of magnitude at a critical
volume concentration (i.e. фc=14.27 Vol.%) ,whereas the dielectric constant and the A.C electrical
conductivity AC of such composites increase suddenly at a critical volume concentration (i.e. фc=14.27
Vol.%).For volume filler content lower than percolation threshold ф<фc> фc there is increase in the value of their
resistivity, and decrease in the value of their dielectric constant and the A.C electrical conductivity AC with
increasing temperature indicating metallic-conduction.
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
Design of Integrated LC Filter Using Multilayer Flexible Ferrite Sheets iosrjce
Dielectric and magnetic materials were developed for use as integrated passive component design.
The integrated LC component to be investigated in this paper uses ferrite material which combines both
magnetic and dielectric properties. Because of this double property, the ferrite sheet will be used in this design
as magnetic core for the inductor and dielectric substrate for the capacitor. The fabrication is simplified by
using PCB inductor and adhesive flexible ferrite sheet. To evaluate the inductance, the capacitance including
the parasitic resistance, a fabricated prototype of the LC component was simulated and measured. It was
confirmed that simulated values were very close to the measured values and the integrated LC component
behaves as low-pass filter
Reduced Dielectric Losses for Underground Cable Distribution SystemsIJAPEJOURNAL
This paper describes the process to reduce dielectric losses for underground cable distribution system. As already known, that system is an alternative solution to energy distribution systems in urban areas. Influence of large capacitance is a separate issue that needs to be resolved.
Large capacitance effect on Express Feeder of 10 miles long has resulted in power losses more than 100 MW per month. In the no-load condition, current dispatch has recorded 10 Amperes, and has increased the voltage at receiving end by 200-500 Volts, with leading power factors.
Installation of the inductor to reduce cable loss dielectrics is done by changing the power factor (pf) to 0.85 lagging. After installation of the inductor, which is 5 mH/700 kVAR, dielectric losses is reduced to 3.57%, which is from 105,983 kW to 102,195 kWh per month. The capacitive leakage current has also been reduced from 249.61 Ampere to 245.17 Ampere.
Effect of Temperature and Nickel Concentration on the Electrical and Dielectr...IJERD Editor
In this paper the effect of temperature range of 298 K to 348 K and volume filler content ф on
electrical properties of polyethylene PE filled with nickel Ni powders has been investigated .The volume
electrical resistivity
V
of such composites decreases suddenly by several orders of magnitude at a critical
volume concentration (i.e. фc=14.27 Vol.%) ,whereas the dielectric constant and the A.C electrical
conductivity AC of such composites increase suddenly at a critical volume concentration (i.e. фc=14.27
Vol.%).For volume filler content lower than percolation threshold ф<фc> фc there is increase in the value of their
resistivity, and decrease in the value of their dielectric constant and the A.C electrical conductivity AC with
increasing temperature indicating metallic-conduction.
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
Design and Simulation of Array of Rectangular Micro Cantilevers Piezoelectric...IJERA Editor
This paper presents the design, analysis and simulation of MEMS based array of bimorph rectangular microcantilever piezoelectric energy harvester structure with and without tip mass, to analyze their sensitivity. The microcantilever beams are made up of piezoelectric material and Aluminium as a substrate material. The analytical simulation of design is done by FEM (COMSOL Multiphysics). The simulation results of bimorph cantilever structure, applied force of 0.1 N and obtained end displacement and electric potential developed are given. The analytical model of the cantilever beam will be analyzed and the process of its construction will be discussed. The changes in the sensitivity of a cantilever beam with respect to change in its shape for the same applied force of 0.1N are denoted.
Structural and Optical properties of Multiwalled Carbon Nanotubes Modified by...TELKOMNIKA JOURNAL
Structure, chemical, and physical properties of Multiwalled Carbon Nanotubes (MWCNTs) after
modification by dielectric barrier discharge (DBD) at atmospheric pressure is investigated using
Transmission Electron Microscopy (TEM), Raman and Uv-vis-NIR spectroscopy. Effects of plasma
treatment time on MWCNTs are analyzed. TEM result shows that during the short period of plasma
treatment time of 5 minutes, the tube surface experienced a few damages. With increase in plasma
treatment time, the tube surface is damaged to a certain extent. Intensity ratio, ID/IG through Raman
analysis shows a good agreement with TEM. The values of ID/IG of the modified MWCNTs are larger than
those of pristine MWCNTs. An increase of ID/IG indicates that considerable defects are produced on the
surfaces of MWCNTs. The treated MWCNTs has energy band gap compared to zero band gap of
untreated MWCNTs. It is believed that the defect site of MWCNTs can modify the electronics properties of
MWCNTs from being metallic to semiconducting structure, which is applicable for almost all electronics
device applications.
Reconfigurable Metamaterial Structure at Millimeter Wave Frequency Range IJECEIAES
In this paper, reconfigurable metamaterial structure at millimeter wave frequency range was designed and simulated for a future fifth generation (5G) mobile-phone beam switching applications. The new proposed structure was composed of a bridge-shaped resonator (BSR) in the front face and strip line at the back face of the unit cell which operates at 28GHz. First, nonreconfigurable low loss BSR unit cell was designed and subsequently, the reconfigurability was achieved using four switches formed in the gaps of the structure. The proposed structure achieves the lowest loss and almost full transmission among its counterparts by -0.06dB (0.99 in linear scale). To demonstrate the reconfigurability of the metamaterial, the reflection and transmission coefficients and real parts of the effective refractive index at each reconfigured frequency were studied and investigated. Simulation results showed that a high transmission and reflection peaks occur at each resonance frequency according to change the state of the switches.
International Refereed Journal of Engineering and Science (IRJES) is a peer reviewed online journal for professionals and researchers in the field of computer science. The main aim is to resolve emerging and outstanding problems revealed by recent social and technological change. IJRES provides the platform for the researchers to present and evaluate their work from both theoretical and technical aspects and to share their views.
Analytical modeling of electric field distribution in dual material junctionl...VLSICS Design
In this paper, electric field distribution of the junctionless dual material surrounding gate MOSFETs
(JLDMSG) is developed. Junctionless is a device that has similar characteristics like junction based
devices, but junctionless has a positive flatband voltage with zero electric field. In Surrounding gate
MOSFETs gate material surrounds the channel in all direction , therefore it can overcome the short
channel effects effectively than other devices. In this paper, surface potential and electric field distribution
is modelled. The proposed surface potential model is compared with the existing central potential model. It
is observed that the short channel effects (SCE) is reduced and the performance is better than the existing
method.
IRJET-Sensitivity Analysis of Maximum Overvoltage on Cables with Considering ...IRJET Journal
Hamed Touhidi ,Mehdi Shafiee, Behrooz Vahidi,Seyed Hossein Hosseinian, "Sensitivity Analysis of Maximum Overvoltage on Cables with Considering Forward and Backward Waves ", International Research Journal of Engineering and Technology (IRJET), Vol2,issue-01 April 2015. e-ISSN:2395-0056, p-ISSN:2395-0072. www.irjet.net
Abstract
lightning is known to be one of the primary sources of most surges in high keraunic areas. It is well-known fact that surge overvoltage is a significant contribution in cable failures. The other source of surge voltage is due to switching and it is pronounce on extra high voltage power transmission systems. The effect of both lightning and switching surges is weakening the cable insulation. The progressive weakening of such insulation will lead to cable deterioration and eventually its failure. Each surge impulse on the cable will contribute with other factors towards cable insulation strength deterioration and ultimately cable can fail by an overvoltage level below the cable basic impulse level (BIL). The maximum lightning overvoltage for a given cable depends on a large number of parameters. This paper presents the effect of model parameters (e.g., rise time and amplitude of surge, length of cable, resistivity of the core and sheath, tower footing resistance, number of sub conductors in the phase conductor (bundle), effect of surge arrester, length of lead, relative permittivity of the insulator material outside the core, power frequency voltage, stroke location, cable joints, shunt reactors, sheath thickness) on maximum cable voltage. The simulations show that the maximum overvoltage.
Analysis of Electric Circuit Model on Atmospheric Pressure Dielectric Barrier...AM Publications
Analysis of Electric Circuit Model on Atmospheric Pressure Dielectric Barrier Discharge (DBD) Plasma has been simulated using the Simulink-Matlab R2010a software. Plasma reactor being used as the basis to determine the parameters in the circuit is in the coaxial form made of pyrex glass with an iron rod as the active electrode and spiral copper wire as passive electrode. The reactor was filled with argon gas with the flow rate of 2 L/s. Simulation circuit model which was prepared based on a DBD equivalent circuit, operated in a voltage range of 1.0 kV to 6.0 kV for frequency of 10 kHz to 66 kHz. Electrical characterization was performed to describe the plasma discharge that occurs in the reactor. The datas of supply voltage and current, as well as voltage and current discharge, was used to determine the average power during one period. From the simulation was obtained an increase in supply and discharge currents with increasing of frequency at the same operating voltage. Discharge power has increased in a specific voltage and increased frequency. It is obtained the average discharge power for 5.5 kV of 11.28 W and 10.90 W at a frequency of 21 kHz and 24 kHz, respectively. The highest efficiency obtained from the simulation that achieved at voltage of 1 kV and frequency of 45.7 kHz is equal to 56.59%.
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.
Space charges analysis on insulator with uniform layer contamination effectTELKOMNIKA JOURNAL
High voltage direct current (HVDC) transmission provides an attractive alternative for bulk power transfer. However, HVDC transmission may have loss about half per unit length of high voltage alternating current (HVAC) at the same amount of power carried. This is due to the space charge formation around the conductor in HVDC cables. It is known that the presence of space charge inside an insulator may distort the local electric field and surface energy. This paper investigates the effect of electrostatics for space charge, electric field and surface energy in the HVDC cable in clean and contaminated conditions. The effect of uniform layer contamination from oil, sandstone and fresh water was conducted on 11 kV XLPE cable using finite element software under electrostatics study. The contamination layer was created around the XLPE cable by multifarious the radius of layer contamination from the conductor. The simulation results show that enlargement of contamination layer radius by 1.0 mm (light), 1.5 mm (medium) and 2.0 mm (heavy) resulted in the reduction of surface energy by 20% and electric field by 22% but increase the space charge amplitude by 76%. The study also found that fresh water can be considered as the worst contamination compared to oil and sandstone.
High Performance Germanium Double Gate N-MOSFETIJMER
The current MOSFET technology supports scaling down to nanometer. To achieve
enhanced transistor switching, it is difficult to keep the equivalent driver current at the same level
since it changes by the certain restrictions like effective masses, density of states, uniaxial- and
biaxial- strain; band structure, channel orientation, channel mobility, off-state leakage, switching
delay in nano-scale and parasitic latch up. Current strained-Si is the ruling technology for
intensifying the performance of MOSFET and development of strain can provide a better solution to
the scaling. The future of nano-scale MOSFETs relies on exploration of novel higher mobility channel
materials such as stained-Ge and strained III-V groups that might perform even better than very
highly strained-Si. In addition, parameters such as injection velocity, short channel length effect and
Band-to-Band Tunneling (BTBT) result in reduction of inversion charge, increase in leakage current,
resulting in decrease in the drive current. While developing accurate model of MOSFETs all these
complex effects should be captured. It is proposed to
1. Design high performance double gate n-MOSFET with channel material Ge.
2. Benchmarked & stimulate high performance double gate n-MOSFET by using the simulation
techniques.
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
MIMO Systems for Military Communication/Applications.IJERA Editor
The Military is embracing the communication revolution, turning to a new generation of sophisticated systems
to enable faster, richer, less costly, more flexible, reliable, compact, mobile, jam resistant, low probability of
detection, re configurable and spectrally efficient communication. Many of these features can be added to a
great extent in the existing systems, by utilising MIMO technology appropriately and judiciously. MIMO finds
applications in wireless communication, NLOS communication, satellite communication, HF communication,
Optical Fibre Communication. MIMO makes these technologies more suitable by introducing features
mandatory for military communication such as Ant jamming capability, Low Probability of Intercept, low
visibility of satellite earth Antennas by reducing their aperture area. MIMO can also provide redundancy by
employing no extra resources, thereby increasing reliability. MIMO is highly effective to communicate with
Unmanned Aerial Vehicles (1).
Solid Waste Management System: Public-Private Partnership, the Best System fo...IJERA Editor
Solid waste management (SWM) is a major public health and environmental concern in urban areas of many
developing countries. Nairobi’s solid waste situation, which could be taken to generally represent the status
which is largely characterized by low coverage of solid waste collection, pollution from uncontrolled dumping
of waste, inefficient public services, unregulated and uncoordinated private sector and lack of key solid waste
management infrastructure. This paper recapitulates on the public-private partnership as the best system for
developing countries; challenges, approaches, practices or systems of SWM, and outcomes or advantages to the
approach; the literature review focuses on surveying information pertaining to existing waste management
methodologies, policies, and research relevant to the SWM. Information was sourced from peer-reviewed
academic literature, grey literature, publicly available waste management plans, and through consultation with
waste management professionals. Literature pertaining to SWM and municipal solid waste minimization,
auditing and management were searched for through online journal databases, particularly Web of Science, and
Science Direct. Legislation pertaining to waste management was also researched using the different databases.
Additional information was obtained from grey literature and textbooks pertaining to waste management topics.
After conducting preliminary research, prevalent references of select sources were identified and scanned for
additional relevant articles. Research was also expanded to include literature pertaining to recycling,
composting, education, and case studies; the manuscript summarizes with future recommendationsin terms
collaborations of public/ private patternships, sensitization of people, privatization is important in improving
processes and modernizing urban waste management, contract private sector, integrated waste management
should be encouraged, provisional government leaders need to alter their mind set, prepare a strategic, integrated
SWM plan for the cities, enact strong and adequate legislation at city and national level, evaluate the real
impacts of waste management systems, utilizing locally based solutions for SWM service delivery and design,
location, management of the waste collection centersand recycling and compositing activities should be
encouraged.
I
Geostatistical analysis of rainfall variability on the plateau of Allada in S...IJERA Editor
The goal of this survey is to contribute to a better understanding of the distribution of the rainfall on the plateau
of Allada in Benin. The plateau of Allada is the garner ofCotonou and vicinities. The food production is over
62% rainfed.Then, it imports to analyze the way how rains are spatially distributed on the area in order to deduct
the potential rainfall. To achieve this goal, rainfall data of 28 stations have been used. Three sub-periods have
been identified: 1996-2000, 2001-2005 and 2006-2010. The distribution of rainfall has been established with
Thiessen and kriging methods. On average, 1117mm of rain fell on the study area per year. But three tendencies
were shown: the less rainy zones, the fairly rainy zones, and the greatly rainy zones. All the rainfall zones knew
an increase of the precipitations except Abomey-Calavi and Niaouli. But the variations are not significant. While
analyzing the spatial structure for the kriging of precipitations, it was revealed a power model of variogram. The
direction of the rainfall gradient is oriented southeast - northwest during the three sub-periods. Abomey-Calavi
recorded the weakest precipitations. The strongest values are interchanged between Toffo and Sékou, OuidahNorth
and Ouidah-City.
Confiscation of Duplicate Tuples in The Relational DatabasesIJERA Editor
Relational database is a collection of relations. Duplicate tuple existence is common in many real time relational
databases. There is no known, simple and direct technique for finding duplicated records in relational database.
In a relational database, if the same real-world entity is represented by more than one tuple, then such tuples are
called duplicate tuples. Finding duplicate tuples and then replacing them by one best tuple is called a fusion
operation. Whenever duplicate tuples are found in the relations of any database, those tuples must be replaced
with one special best approximate tuple that represents the joint information of all the duplicate tuples. Present
study proposes new techniques to find duplicate tuples and then remove those duplicate tuples with the correct
real world tuples. In the first step duplicate tuples in the relation are classified based on the class label and in the
second step then for each set of duplicate tuples functional dependency method or union method is applied to
replace duplicate tuples with the corresponding correct real world single tuple. One possibility is to replace one
set of duplicate tuples with one correct real world tuple. Another possibility is to replace two or more sets of
duplicate tuples in the relation by one set of correct real world tuples. Sometimes the removal of duplicate tuples
in the relations of any relational database can create referential integrity violations. All such violations must be
controlled and coordinated syntactically as well as semantically in relations
Design and Simulation of Array of Rectangular Micro Cantilevers Piezoelectric...IJERA Editor
This paper presents the design, analysis and simulation of MEMS based array of bimorph rectangular microcantilever piezoelectric energy harvester structure with and without tip mass, to analyze their sensitivity. The microcantilever beams are made up of piezoelectric material and Aluminium as a substrate material. The analytical simulation of design is done by FEM (COMSOL Multiphysics). The simulation results of bimorph cantilever structure, applied force of 0.1 N and obtained end displacement and electric potential developed are given. The analytical model of the cantilever beam will be analyzed and the process of its construction will be discussed. The changes in the sensitivity of a cantilever beam with respect to change in its shape for the same applied force of 0.1N are denoted.
Structural and Optical properties of Multiwalled Carbon Nanotubes Modified by...TELKOMNIKA JOURNAL
Structure, chemical, and physical properties of Multiwalled Carbon Nanotubes (MWCNTs) after
modification by dielectric barrier discharge (DBD) at atmospheric pressure is investigated using
Transmission Electron Microscopy (TEM), Raman and Uv-vis-NIR spectroscopy. Effects of plasma
treatment time on MWCNTs are analyzed. TEM result shows that during the short period of plasma
treatment time of 5 minutes, the tube surface experienced a few damages. With increase in plasma
treatment time, the tube surface is damaged to a certain extent. Intensity ratio, ID/IG through Raman
analysis shows a good agreement with TEM. The values of ID/IG of the modified MWCNTs are larger than
those of pristine MWCNTs. An increase of ID/IG indicates that considerable defects are produced on the
surfaces of MWCNTs. The treated MWCNTs has energy band gap compared to zero band gap of
untreated MWCNTs. It is believed that the defect site of MWCNTs can modify the electronics properties of
MWCNTs from being metallic to semiconducting structure, which is applicable for almost all electronics
device applications.
Reconfigurable Metamaterial Structure at Millimeter Wave Frequency Range IJECEIAES
In this paper, reconfigurable metamaterial structure at millimeter wave frequency range was designed and simulated for a future fifth generation (5G) mobile-phone beam switching applications. The new proposed structure was composed of a bridge-shaped resonator (BSR) in the front face and strip line at the back face of the unit cell which operates at 28GHz. First, nonreconfigurable low loss BSR unit cell was designed and subsequently, the reconfigurability was achieved using four switches formed in the gaps of the structure. The proposed structure achieves the lowest loss and almost full transmission among its counterparts by -0.06dB (0.99 in linear scale). To demonstrate the reconfigurability of the metamaterial, the reflection and transmission coefficients and real parts of the effective refractive index at each reconfigured frequency were studied and investigated. Simulation results showed that a high transmission and reflection peaks occur at each resonance frequency according to change the state of the switches.
International Refereed Journal of Engineering and Science (IRJES) is a peer reviewed online journal for professionals and researchers in the field of computer science. The main aim is to resolve emerging and outstanding problems revealed by recent social and technological change. IJRES provides the platform for the researchers to present and evaluate their work from both theoretical and technical aspects and to share their views.
Analytical modeling of electric field distribution in dual material junctionl...VLSICS Design
In this paper, electric field distribution of the junctionless dual material surrounding gate MOSFETs
(JLDMSG) is developed. Junctionless is a device that has similar characteristics like junction based
devices, but junctionless has a positive flatband voltage with zero electric field. In Surrounding gate
MOSFETs gate material surrounds the channel in all direction , therefore it can overcome the short
channel effects effectively than other devices. In this paper, surface potential and electric field distribution
is modelled. The proposed surface potential model is compared with the existing central potential model. It
is observed that the short channel effects (SCE) is reduced and the performance is better than the existing
method.
IRJET-Sensitivity Analysis of Maximum Overvoltage on Cables with Considering ...IRJET Journal
Hamed Touhidi ,Mehdi Shafiee, Behrooz Vahidi,Seyed Hossein Hosseinian, "Sensitivity Analysis of Maximum Overvoltage on Cables with Considering Forward and Backward Waves ", International Research Journal of Engineering and Technology (IRJET), Vol2,issue-01 April 2015. e-ISSN:2395-0056, p-ISSN:2395-0072. www.irjet.net
Abstract
lightning is known to be one of the primary sources of most surges in high keraunic areas. It is well-known fact that surge overvoltage is a significant contribution in cable failures. The other source of surge voltage is due to switching and it is pronounce on extra high voltage power transmission systems. The effect of both lightning and switching surges is weakening the cable insulation. The progressive weakening of such insulation will lead to cable deterioration and eventually its failure. Each surge impulse on the cable will contribute with other factors towards cable insulation strength deterioration and ultimately cable can fail by an overvoltage level below the cable basic impulse level (BIL). The maximum lightning overvoltage for a given cable depends on a large number of parameters. This paper presents the effect of model parameters (e.g., rise time and amplitude of surge, length of cable, resistivity of the core and sheath, tower footing resistance, number of sub conductors in the phase conductor (bundle), effect of surge arrester, length of lead, relative permittivity of the insulator material outside the core, power frequency voltage, stroke location, cable joints, shunt reactors, sheath thickness) on maximum cable voltage. The simulations show that the maximum overvoltage.
Analysis of Electric Circuit Model on Atmospheric Pressure Dielectric Barrier...AM Publications
Analysis of Electric Circuit Model on Atmospheric Pressure Dielectric Barrier Discharge (DBD) Plasma has been simulated using the Simulink-Matlab R2010a software. Plasma reactor being used as the basis to determine the parameters in the circuit is in the coaxial form made of pyrex glass with an iron rod as the active electrode and spiral copper wire as passive electrode. The reactor was filled with argon gas with the flow rate of 2 L/s. Simulation circuit model which was prepared based on a DBD equivalent circuit, operated in a voltage range of 1.0 kV to 6.0 kV for frequency of 10 kHz to 66 kHz. Electrical characterization was performed to describe the plasma discharge that occurs in the reactor. The datas of supply voltage and current, as well as voltage and current discharge, was used to determine the average power during one period. From the simulation was obtained an increase in supply and discharge currents with increasing of frequency at the same operating voltage. Discharge power has increased in a specific voltage and increased frequency. It is obtained the average discharge power for 5.5 kV of 11.28 W and 10.90 W at a frequency of 21 kHz and 24 kHz, respectively. The highest efficiency obtained from the simulation that achieved at voltage of 1 kV and frequency of 45.7 kHz is equal to 56.59%.
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.
Space charges analysis on insulator with uniform layer contamination effectTELKOMNIKA JOURNAL
High voltage direct current (HVDC) transmission provides an attractive alternative for bulk power transfer. However, HVDC transmission may have loss about half per unit length of high voltage alternating current (HVAC) at the same amount of power carried. This is due to the space charge formation around the conductor in HVDC cables. It is known that the presence of space charge inside an insulator may distort the local electric field and surface energy. This paper investigates the effect of electrostatics for space charge, electric field and surface energy in the HVDC cable in clean and contaminated conditions. The effect of uniform layer contamination from oil, sandstone and fresh water was conducted on 11 kV XLPE cable using finite element software under electrostatics study. The contamination layer was created around the XLPE cable by multifarious the radius of layer contamination from the conductor. The simulation results show that enlargement of contamination layer radius by 1.0 mm (light), 1.5 mm (medium) and 2.0 mm (heavy) resulted in the reduction of surface energy by 20% and electric field by 22% but increase the space charge amplitude by 76%. The study also found that fresh water can be considered as the worst contamination compared to oil and sandstone.
High Performance Germanium Double Gate N-MOSFETIJMER
The current MOSFET technology supports scaling down to nanometer. To achieve
enhanced transistor switching, it is difficult to keep the equivalent driver current at the same level
since it changes by the certain restrictions like effective masses, density of states, uniaxial- and
biaxial- strain; band structure, channel orientation, channel mobility, off-state leakage, switching
delay in nano-scale and parasitic latch up. Current strained-Si is the ruling technology for
intensifying the performance of MOSFET and development of strain can provide a better solution to
the scaling. The future of nano-scale MOSFETs relies on exploration of novel higher mobility channel
materials such as stained-Ge and strained III-V groups that might perform even better than very
highly strained-Si. In addition, parameters such as injection velocity, short channel length effect and
Band-to-Band Tunneling (BTBT) result in reduction of inversion charge, increase in leakage current,
resulting in decrease in the drive current. While developing accurate model of MOSFETs all these
complex effects should be captured. It is proposed to
1. Design high performance double gate n-MOSFET with channel material Ge.
2. Benchmarked & stimulate high performance double gate n-MOSFET by using the simulation
techniques.
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
MIMO Systems for Military Communication/Applications.IJERA Editor
The Military is embracing the communication revolution, turning to a new generation of sophisticated systems
to enable faster, richer, less costly, more flexible, reliable, compact, mobile, jam resistant, low probability of
detection, re configurable and spectrally efficient communication. Many of these features can be added to a
great extent in the existing systems, by utilising MIMO technology appropriately and judiciously. MIMO finds
applications in wireless communication, NLOS communication, satellite communication, HF communication,
Optical Fibre Communication. MIMO makes these technologies more suitable by introducing features
mandatory for military communication such as Ant jamming capability, Low Probability of Intercept, low
visibility of satellite earth Antennas by reducing their aperture area. MIMO can also provide redundancy by
employing no extra resources, thereby increasing reliability. MIMO is highly effective to communicate with
Unmanned Aerial Vehicles (1).
Solid Waste Management System: Public-Private Partnership, the Best System fo...IJERA Editor
Solid waste management (SWM) is a major public health and environmental concern in urban areas of many
developing countries. Nairobi’s solid waste situation, which could be taken to generally represent the status
which is largely characterized by low coverage of solid waste collection, pollution from uncontrolled dumping
of waste, inefficient public services, unregulated and uncoordinated private sector and lack of key solid waste
management infrastructure. This paper recapitulates on the public-private partnership as the best system for
developing countries; challenges, approaches, practices or systems of SWM, and outcomes or advantages to the
approach; the literature review focuses on surveying information pertaining to existing waste management
methodologies, policies, and research relevant to the SWM. Information was sourced from peer-reviewed
academic literature, grey literature, publicly available waste management plans, and through consultation with
waste management professionals. Literature pertaining to SWM and municipal solid waste minimization,
auditing and management were searched for through online journal databases, particularly Web of Science, and
Science Direct. Legislation pertaining to waste management was also researched using the different databases.
Additional information was obtained from grey literature and textbooks pertaining to waste management topics.
After conducting preliminary research, prevalent references of select sources were identified and scanned for
additional relevant articles. Research was also expanded to include literature pertaining to recycling,
composting, education, and case studies; the manuscript summarizes with future recommendationsin terms
collaborations of public/ private patternships, sensitization of people, privatization is important in improving
processes and modernizing urban waste management, contract private sector, integrated waste management
should be encouraged, provisional government leaders need to alter their mind set, prepare a strategic, integrated
SWM plan for the cities, enact strong and adequate legislation at city and national level, evaluate the real
impacts of waste management systems, utilizing locally based solutions for SWM service delivery and design,
location, management of the waste collection centersand recycling and compositing activities should be
encouraged.
I
Geostatistical analysis of rainfall variability on the plateau of Allada in S...IJERA Editor
The goal of this survey is to contribute to a better understanding of the distribution of the rainfall on the plateau
of Allada in Benin. The plateau of Allada is the garner ofCotonou and vicinities. The food production is over
62% rainfed.Then, it imports to analyze the way how rains are spatially distributed on the area in order to deduct
the potential rainfall. To achieve this goal, rainfall data of 28 stations have been used. Three sub-periods have
been identified: 1996-2000, 2001-2005 and 2006-2010. The distribution of rainfall has been established with
Thiessen and kriging methods. On average, 1117mm of rain fell on the study area per year. But three tendencies
were shown: the less rainy zones, the fairly rainy zones, and the greatly rainy zones. All the rainfall zones knew
an increase of the precipitations except Abomey-Calavi and Niaouli. But the variations are not significant. While
analyzing the spatial structure for the kriging of precipitations, it was revealed a power model of variogram. The
direction of the rainfall gradient is oriented southeast - northwest during the three sub-periods. Abomey-Calavi
recorded the weakest precipitations. The strongest values are interchanged between Toffo and Sékou, OuidahNorth
and Ouidah-City.
Confiscation of Duplicate Tuples in The Relational DatabasesIJERA Editor
Relational database is a collection of relations. Duplicate tuple existence is common in many real time relational
databases. There is no known, simple and direct technique for finding duplicated records in relational database.
In a relational database, if the same real-world entity is represented by more than one tuple, then such tuples are
called duplicate tuples. Finding duplicate tuples and then replacing them by one best tuple is called a fusion
operation. Whenever duplicate tuples are found in the relations of any database, those tuples must be replaced
with one special best approximate tuple that represents the joint information of all the duplicate tuples. Present
study proposes new techniques to find duplicate tuples and then remove those duplicate tuples with the correct
real world tuples. In the first step duplicate tuples in the relation are classified based on the class label and in the
second step then for each set of duplicate tuples functional dependency method or union method is applied to
replace duplicate tuples with the corresponding correct real world single tuple. One possibility is to replace one
set of duplicate tuples with one correct real world tuple. Another possibility is to replace two or more sets of
duplicate tuples in the relation by one set of correct real world tuples. Sometimes the removal of duplicate tuples
in the relations of any relational database can create referential integrity violations. All such violations must be
controlled and coordinated syntactically as well as semantically in relations
Speed Control of Induction Motor Using PLC and SCADA SystemIJERA Editor
Automation or automatic control is the use of various control systems for operating equipment such as
machinery, processes in factories, boilers and heat-treating ovens, switching in telephone networks, steering and
stabilization of ships, aircraft and other applications with minimal or reduced human intervention. Some
processes have been completely automated. The motor speed is controlled via the driver as an open loop control.
To make a more precise closed loop control of motor speed we will use a tachometer to measure the speed and
feed it back to the PLC, which compares to the desired value and take a control action, then the signal is
transferred to the motor – via driver – to increase / decrease the speed. We will measure the speed of the motor
using an incremental rotary encoder by adjusting parameters (PLC, driver) and also we need to reduce the
overall cost of the system. Our control system will be held using the available Siemens PLC. In addition, we will
monitor motor parameters via SCADA system.
Analytic Solutions to the Darcy-Lapwood-Brinkman Equation with Variable Perme...IJERA Editor
Three exact solutions to the Darcy-Lapwood-Brinkman equation with variable permeability are obtained in this
work. Solutions are obtained for a given vorticity distribution, taken as a function of the streamfunction.
Classification of the flow field is provided and comparison is made with the solutions obtained when
permeability is constant. Interdependence of Reynolds number and variable permeability is emphasized.
Database Security Two Way Authentication Using Graphical PasswordIJERA Editor
As data represent a key asset for today's organizations. The problem is that how to protect this data from
attackers, theft and misuse is at the forefront of any organization’s mind. Even though today several data
security techniques are available to protect database and computing infrastructure, many such as network
security and firewalls tools are unable to prevent attacks from insider. Insider is a person working in
organization who can try to access the sensitive data. This paper proposes a two-way authentication method
which fuses knowledge-based secret and personal trait information.
A SECURITY BASED VOTING SYSTEMUSING BIOMETRICIJERA Editor
The problem of voting is still critical in terms of safety and security. This paper is about the
design and development of a voting system using fingerprint to provide a high performance with high security
to the voting system. Fingerprint biometrics is widely used for identification. Biometrics identifiers cannot be
misplaced and they represent any individual identity. The integration of biometric with electronic voting
machine requires less manpower, save much time of voters and personal, ensure accuracy,transparency and fast
result in election. In this paper a framework for electronic voting machine based on biometric verification is
proposed and implemented. The proposed framework provides secured identification and authentication
processes for the voters and candidates through the use of fingerprint biometric
A Hypothetical Study on Structural aspects of Indole-3-carbinol (I3C) by Hype...IJERA Editor
Indole-3-carbinol (I3C) is a plant compound derived from glucosinolates, found in cruciferous vegetables.
Researchers have indicated that I3C shows great promise as a cancer preventative and hormone-balancing agent.
HyperChem 7.5 software was used for quantum mechanical calculations. The geometry optimization was
carried out using Ab Initio method. QSAR parameters were generated with semi empirical single point AM1
method. The HOMO and LUMO frontier orbital energies were also computed. Conformational analysis and
geometry optimization of Indole-3-carbinol (I3C) was performed according to the Hartree-Fock (HF)
calculation method by ArgusLab 4.0.1 software .The minimum heat of formation is calculated by geometry
convergence function by ArgusLab software. PM3 semi empirical quantum mechanical calculations were
carried out on structure of Indole-3-carbinol (I3C) to obtain the geometries, geometric parameters and
thermodynamic parameters. The HOMO and LUMO frontier orbital energies were also computed for the
optimized molecule. Electron density surface of IDOX is determined using PM3 geometry with PM3
wavefunciton.
The Recent Trend: Vigorous unidentified validation access control system with...IJERA Editor
Service Providers can grow their business by selling our cloud authentication service that can be fully branded
to the Service Provider or if required a Service. The proposed enhanced decentralized access control scheme for
secure data storage in clouds that supports anonymous authentication. In the proposed scheme, the cloud verifies
the authenticity of the series without knowing the user’s identity before storing data. The scheme also has the
added feature of access control in which only valid users are able to decrypt the stored information. The scheme
prevents replay attacks and supports creation, modification, and reading data stored in the cloud. It addresses
user revocation. Moreover, our authentication and access control scheme is decentralized and robust, unlike
other access control schemes designed for clouds which are centralized. The communication, hiding attributes,
increasing high security in access, computation, and storage overheads are comparable to centralized
approaches.
In Existing, it is based on ABE (attribute based encryption) technique which is a centralized approach, where a
single Key Distribution Centre (KDC) distributes secret keys and attributes to all users using asymmetric key
approach. We propose a new decentralized access control method for storing data by providing security in
clouds and also we hide the attributes and access rule of a user. The cloud validates the authentication of the
sequence without knowing the users characteristics previous to the data store. By using this approach only
certified users have right to use the suitable attributes. In future, time based file revocation scheme can be used
to assure the deletion of a file. When time limit of a file expires, we implement the policy based renewal of time
to that file.
Assessment on the Ecosystem Service Functions of Nansi Lake in ChinaIJERA Editor
The assessment of ecosystem service functions is one of the focused area in modern ecological and
environmental research. As a typical shallow macrophytic lake in China, Nansi Lake is selected as the study
area. Based the indicator system and assessment models established in this research, the ecosystem service
functions of Nansi Lake are assessed. The results show that the ecosystem service function of drinking water
source area/aquatic product supply/ecological habitat/entertainment and landscape/ water purification function of
the lakeside zone for Nansi Lake is assessed as medium (2.2)/good (3.5)/medium (3)/medium (2.55)/medium (3),
and the overall ecosystem service function of Nansi Lake can be considered as ―Medium‖. The eutrophication
control and ecological restoration of lakeside wetland need to be enhanced in the future.
The use of Cooking Gas as Refrigerant in a Domestic RefrigeratorIJERA Editor
The application of cooking gas refrigerants in refrigeration system is considered to be a potential way to improve
energy efficiency and to encourage the use of environment-friendly refrigerants. Refrigeration operation has
been met with many challenges as it deals with environmental impact, how it affects humans and how it
contributes to the society in general. Domestic refrigerators annually consume several metric tons of traditional
refrigerants, which contribute to very high Ozone Depletion Potential (ODP) and Global Warming Potential
(GWP). The experiment conducted employs the use of two closely linked refrigerants, R600a (Isobutene) and
cooking gas which is varied in an ideal refrigerant mixture of 150 g of refrigerant and 15 ml of lubricating oil (to
a rating of 40 wt % expected in the compressor). The Laboratory process involved the use of Gas
Chromatography machine to ascertain the values of the mole ratio, molecular weight and critical temperatures.
Prode properties and Refprop softwares were used to ascertain other refrigerant properties of the mixture. The
results indicated that the mixture of R600a with lubricant confirm mineral oil as being the most appropriate for
the operation. The experimental results indicated that the refrigeration system with cooking gas refrigerant
worked normally and was found to attain high freezing capacity and a COP value of 2.159. It is established that
cooking gas is a viable alternative refrigerant to replace R600a in domestic refrigerators. Hence, its application
in refrigerating systems measures up to the current trend on environmental regulations with hydrocarbon
refrigerants
Finite Element Analysis of Composite Deck Slab Using Perfobond Rib as Shear C...IJERA Editor
Nowadays, the composite decks are very common to use in composite or steel construction. In this case of study
the composite slabs have been investigated numerically by Finite Element Method (FEM). Five composite slabs
were analyzed using finite element software LUSAS. The deflection of each model were obtained and compared
with experimental test. Results showed a good agreement with the experimental data and indicate that the
perfobond rib is appropriate shear connector for the bridges decks
SUSTAINABLE BUILDINGS IN HOT AND DRY CLIMATE OF INDIAIJERA Editor
The consumption of energy in the buildings is increasing as the development is taking at a very fast rate. No evidence is now
required to prove that the present climate changes are directly linked to the human activities and also the concerns regarding
exploitation of the fossil fuel have reached a level where the negative effect are having impact on the life of a common man.
Passive Architecture involves blending conventional architectural principles with solar & wind energy and the inherent
properties of building materials to ensure that the interiors remain warm in winter and cool in summer, thus creating a yearround
comfortable environment. Various solar passive techniques have been studied in detail so that the undesirable impact
in hot and dry climate could be mitigated. It is concluded that with the application of these techniques the building could be
made comfortable with comparatively less use of energy
Comparative Analysis of Different Wavelet Functions using Modified Adaptive F...IJERA Editor
The traditional method of wavelet denoising is inefficient in removing the overlap noise between noisy signal
and noise, due to which a modified adaptive filtering based on wavelet transform method is introduced. The
method used in this paper filters out the noise on the basis of wavelet denoising using different wavelet
functions. The simulation results indicate the Signal to Noise ratio (SNR), Mean Square Error (MSE) and signal
error power spectral density comparison plot between different wavelet functions. These comparison results
verified that Daubechies is more efficient than other wavelet functions in filtering out noise in all perspectives.
On approximations of trigonometric Fourier series as transformed to alternati...IJERA Editor
Trigonometric Fourier series are transformed into: (1) alternating series with terms of finite sums or
(2) finite sums of alternating series. Alternating series may be approximated by finite sums more accurately as
compared to their simple truncation. The accuracy of these approximations is discussed.
In this article, the issues that have captured the attention of researchers in multinational corporations (MNC) are
discussed and the emerging research agenda is laid out. The first part focuses on understanding the history, and
contemporary scale and significance of multinationals as economic actors. Two opposing perspectives are
distinguished, the economic and the political. In the past, there was a rigid divide between these but,
increasingly, researchers are using elements of both perspectives to understand the dynamics of multinationals.
The crucial additional feature here is the importation of insights from institutional literature on the relationship
between firms and national contexts. Multinational corporations (MNCs) are playing a large and growing role in
shaping our world, both economically and politically. Public and academic opinion has long been mired in an
inconclusive debate as to whether these phenomena are beneficial things that should be encouraged or harmful
things that need intensive governmental regulation. The integrating thesis of this book is that the question as to
whether they are good or bad is the wrong question and is based on the fundamentally faulty premise that all
foreign subsidiaries are essentially similar, i.e., MNCs are homogeneous entities The inevitability of
heterogeneity results in the imperatives of disaggregation and the fallacy of generalization if these complex,
differentiated phenomena are to be properly understood.
Comparison of PWM Techniques and Selective Harmonic Elimination for 3-Level I...IJERA Editor
In this paper comparison of Selective Harmonic Elimination (SHE) method with different Pulse Width
Modulation (PWM) technique which are used as gate pulse for firing the IGBT‟s. Higher order harmonics are
easily eliminated by selecting a proper tuned value filters but lower order harmonics such as 3rd, 5th, 7th, and
9th are not easily eliminated. This paper includes Newton- Rapson method with random initial guess is used for
SHE reduction and shows where the solution can exit by solving transcendental non linear equations. With the
use of this method lower order harmonics as well as Total Harmonic Distortion (THD) will get reduce. In this
paper a cascaded H-bridge Multilevel Inverter using MATLAB/Simulink blocks is presented.
Digitization of Speedometer Incorporating Arduino and Tracing of Location Usi...IJERA Editor
This paper deals with the method of telemetric field which has grown exponentially in recent years. A correct
characterization is to handle, analyze the signals from the sensor which switches, positions and detects the
speed. Placing the sensor on the wheels of the train, a continuous pulse train of signal will be proportional to
train speed and it is sent toArduino microcontroller to analyze, process and simultaneously data will be stored
in memory and displayed. In addition, GPS is used to trace the current location and it is viewed with the help of
LCD placed in every compartment. Thus the simulation has been carried out using MATLAB/SIMULINK
software. Both the simulation and experimental results under diverse conditions are presented to clearly describe
the process of characterization of our system.
Fea of pcb multilayer stack up high voltage planar transformer for aerospace...elelijjournal
High voltage planar transformer is a technology which can replace conventional transformer with its distinct advantages of saturation and cost efficiency. This paper includes, study and solution methods for PCB winding configuration in planar magnetic elements with multilayer
stack up of PCB Cu-tracks, producing High voltage power supply for aerospace application.With finite element analysis (FEA) simulations, different simulation outcomes are discussed for inspecting flux intensity and current density distribution with computing Electric field strength
and Magnetic fields. In principal conclusion of study, complete analysis and some practical design guidelines for
multilayer PCB stack up are discussed in this paper.
Design and modeling of solenoid inductor integrated with FeNiCo in high frequ...TELKOMNIKA JOURNAL
In this work, the design and modeling of the solenoid inductor are discussed. The layout of integrated inductors with magnetic cores and their geometrical parameters are developed. The quality factor Q and inductance value L are derived from the S-parameters and plotted versus frequency. The effect of solenoid inductor geometry on inductance and quality factor are studied via simulation using MATLAB. The solenoid inductor geometry parameters considered are the turn’s number, the magnetic core length, the width of a magnetic core, the gap between turns, the magnetic core thickness, the coil thickness, and solenoid inductor oxide thickness. The performance of the proposed solenoid inductor integrated with FeNiCo is compared with other solenoid inductors.
Modeling and Structure Optimization of Tapped Transformer Yayah Zakaria
In this paper, a simplified circuit model of the tapped transformer structure has been presented to extract the Geometric and technology parameters and offer better physical understanding. Moreover, the structure of planar transformer has been optimized by using changing the width and space of the
primary coil, so as to enlarge the quality factor Q and high coupling coefficient K. To verify the results obtained by using these models, we have compared them with the results obtained by employing the MATLAB simulator. Very good agreement has been recorded for the effective primary
inductance value, whereas the effective primary quality factor value has shown a somewhat larger deviation than the inductance.
Modeling and Structure Optimization of Tapped Transformer IJECEIAES
In this paper, a simplified circuit model of the tapped transformer structure has been presented to extract the Geometric and technology parameters and offer better physical understanding. Moreover, the structure of planar transformer has been optimized by using changing the width and space of the primary coil, so as to enlarge the quality factor Q and high coupling coefficient K. To verify the results obtained by using these models, we have compared them with the results obtained by employing the MATLAB simulator. Very good agreement has been recorded for the effective primary inductance value, whereas the effective primary quality factor value has shown a somewhat larger deviation than the inductance.
The Performance of an Integrated Transformer in a DC/DC ConverterTELKOMNIKA JOURNAL
The separation between the low-voltage part and high-voltage part of the converter is formed by a
transformer that transfers power while jamming the DC ring. The resonant mode power oscillator is utilized
to allow elevated competence power transfer. The on-chip transformer is probable to have elevated value
inductance, elevated quality factors and elevated coupling coefficient to decrease the loss in the
oscillation. The performance of a transformer is extremely dependent on the structure, topology and other
essential structures that create it compatible with the integrated circuits IC process such as patterned
ground shield (PGS). Different types of transformers are modeled and simulated in MATLAB; the
performances are compared to select the optimum design. The on-chip transformer model is simulated
and the Results of MATLAB simulation are exposed, showing an excellent agreement in radio frequency
RF.
Effect of Passive Damping on the Performance of Buck Converter for Magnet Loadpaperpublications3
Abstract: A DC to DC converter is a lossless dc transformer that supply regulated output voltage under varying load and input voltage condition and also the converter parameter values changes with time and physical quantity like temperature etc. This paper presents the design and simulation of an open loop buck converter for magnet load using Simulink and Sim Power System library of MATLAB.
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.
IR Drop Analysis and Its Reduction Techniques in Deep Submicron TechnologyIJERA Editor
This paper presents a detailed conceptual analysis of IR Drop effect in deep submicron technologies and its reduction techniques. The IR Drop effect in power/ground network increases rapidly with technology scaling. This affects the timing of the design and hence the desired speed. It is shown that in present day designs, using well known reduction techniques such as wire sizing and decoupling capacitor insertion, may not be sufficient to limit the voltage fluctuations and hence, two more important methods such as selective glitch reduction technique and IR Drop reduction through combinational circuit partitioning are discussed and the issues related to all the techniques are revised.
PROJECT DESCRIPTION
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The main objective of this project is to develop a device for wireless power transfer. The concept of wireless power transfer was realized by Nikolas tesla. Wireless power transfer can make a remarkable change in the field of the electrical engineering which eliminates the use conventional copper cables and current carrying wires.
Based on this concept, the project is developed to transfer power within a small range. This project can be used for charging batteries those are physically not possible to be connected electrically such as pace makers (An electronic device that works in place of a defective heart valve) implanted in the body that runs on a battery.
The patient is required to be operated every year to replace the battery. This project is designed to charge a rechargeable battery wirelessly for the purpose. Since charging of the battery is not possible to be demonstrated, we are providing a DC fan that runs through wireless power.
This project is built upon using an electronic circuit which converts AC 230V 50Hz to AC 12V, High frequency. The output is fed to a tuned coil forming as primary of an air core transformer. The secondary coil develops a voltage of HF 12volt.
Thus the transfer of power is done by the primary(transmitter) to the secondary that is separated with a considerable distance(say 3cm). Therefore the transfer could be seen as the primary transmits and the secondary receives the power to run load.
Moreover this technique can be used in number of applications, like to charge a mobile phone, iPod, laptop battery, propeller clock wirelessly. And also this kind of charging provides a far lower risk of electrical shock as it would be galvanically isolated.
The Determination of Effects of Primary and Secondary Geometry of Tubular Lin...IOSRJEEE
In this paper, general information on the construction of tubular generators are given. Also, the numeric analyses were conducted by using 2D and 3D finite elements software. The output power, iron loss and cogging force change were compared by sensing the primary and secondary structural geometry of generator. Instead of the annular magnets, the magnets in the form of block were used mobile (secondary) part of generator. Also, analyses were conducted on the generator for two primary geometries.
HFSS ANTENNA FOR KU BAND WITH DEFECTED GROUND STRUCTURESAKSHAT GANGWAR
A wide band Microstrip antenna is proposed for Ku band applications with defected groundd structure. A circular shape defect is integrated in the ground plane. A novel equivalent circuit model is proposed for Microstrip patch antenna with defected ground structure. Accurate design equations are presented for the wideband Microstrip antenna and theoretical analysis is done for the proposed structure. The proposed antenna has an impedance bandwidth of 56.67% ranging from 9.8 GHz to 17.55 GHz, which covers Ku-band and partially X-band. The antenna shows good radiation characteristics within the entire band, and has a gain ranging from 5 dBi to 12.08 dBi. Minimum isolation between co-polar and cross-polarization level of 20 dB and 15 dB is achieved in H-plane and E-plane respectively. The simulation of the proposed antenna is done on HFSS v.13, and measured results of fabricated antenna are in good agreement with the theoretical and simulated results
Band-pass filter based on complementary split ring resonatorTELKOMNIKA JOURNAL
This letter presents a new circuit of the band-pass filter designed by using microstrip technology. Based on complementary split ring resonator and various series of optimization technic and a specific design method, a miniature band-pass filter with excellent electrical performances is achieved. First of all, the metamaterial unit cell is studied to obtain a desired resonant frequency and it is implemented in the ground plan in order to increase the characteristics of the bandpass behavior and decrease its operating frequencies. This proposed circuit is designed on an FR-4 substrate having a relative permittivity of 4.4 tangential losses of 0.025 and thickness of 1.6 mm. This filter is developed by using CST Microwave. The obtained features allow this filter to be used in diverse wireless applications such as IMT-E and WiMax.
Similar to Design and Simulation of a Fractal Micro-Transformer (20)
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
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Design and Simulation of a Fractal Micro-Transformer
1. Sahil Kumar Bhagat et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN: 2248-9622, Vol. 6, Issue 3, (Part - 2) March 2016, pp.05- 08
www.ijera.com 5|P a g e
Design and Simulation of a Fractal Micro-Transformer
Sahil Kumar Bhagat1
, Navdeep Batish2
Dept of Electrical Engineering, Sri Sai College of Engineering & Technology, Pathankot, Punjab-15001, India
ABSTRACT
Due to advancement in smart technologies, the issues like renewable energy integrations into the existing power
systems, reduced weight and size of power equipments is required. In this regard, this work is focused on the
study and design of fractal type micro-transformer for day-to-day applications. An air core transformer is
designed using finite element modeling. The obtained results showed far better implementation parameters in
comparison to the macro transformers.
Keywords - Finite element modeling, micro-transformer, 2D simulation, energy conversion, magnetic field.
I. INTRODUCTION
Coils and transformers are basic components
in electronic devices. Integrating transformers in
electronic ICs is usually done with planar structures
but the resulting efficiency is low. A lot of work has
been done recently in order to overcome this
drawback. Some processes have been studied both by
realizing a thick integrated magnetic circuit and by
realizing high thickness coils by copper electro-
deposition [1–3]. Both techniques have shown good
results.
In coming decades, new generations of
electronic products such as mobile phones,
notebooks, and e-paper will be developed with the
primary goals of mobilization and miniaturization.
New CMOS fabrication technology will be applied to
fabricate the miniaturized IC of electronic products
on silicon substrates, including on-chip micro-
transformers. Several issues of on-chip micro-
transformers have been investigated for many years
[4]. Some researches focused on the material of the
magnetic core and the geometry of the transformer
[5]. Some papers discussed the parasitic effect of the
conductive substrates. Transformer losses become
dramatic at high frequencies and limit the
performance of the transformers. Previous studies
have discussed in detail the causes of transformer
losses such as parasitic capacitance, ohmic loss, and
substrate loss [6] [7]. Core loss from the solid
magnetic core significantly affected the performance
of the transformers. Transformers with magnetic core
exhibit relatively high loss and compromised
isolation at high frequencies due to degradation in
magnetic core performances with the increase of
frequency. Several ferrite core magnetic transformers
have been reported by researchers. But it was
estimated that the efficiency, operating frequency,
and current limitation are the main challenges
because of the magnetic saturation and eddy current
losses in the ferrite magnetic core material at high
frequencies. However, it is observed that the
performance of the air core transformer is better than
the magnetic core counterpart at high frequencies due
to no lossy core material involved in air core
transformers. The solutions for the solid magnetic
core loss were proposed.
II. MATHEMATICAL ANALYSIS
The device presented in this paper is a two-winding
transformer, with bonding wires as coils completed
on the metallization layer, and a toroidal ferrite as a
magnetic core. The low-frequency self-inductance of
each winding L is estimated by the reluctance
formula as [8].
2
0 1 c
c
n A
L
l
where
7
0
4 10
H/m is the free-space
permeability, μ1 is the core relative permeability, Ac
is the cross-sectional area of the core, lc is the mean
magnetic path length, and n is the number of turns of
the coil considered. The low frequency series
resistance of the winding R can be expressed as R =
n(Rb + Rm), where Rb is the bonding wire resistance,
and Rm is the printed circuit board (PCB) metal
conductor resistance [9] [10]. Since in a real
transformer not all flux produced by the primary
winding is coupled to the secondary one, the mutual
inductance L12 is defined by:
1
2
2 22
12
1 11
n L
n
n L
12 11 22
.L k L L
where k is the coupling coefficient which measures
the magnetic coupling between the coils, and L11 and
L22 are the self-inductances evaluated by (1) of
primary and secondary windings, respectively. For
the transformer we can define the turns ratio
RESEARCH ARTICLE OPEN ACCESS
2. Sahil Kumar Bhagat et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN: 2248-9622, Vol. 6, Issue 3, (Part - 2) March 2016, pp.05- 08
www.ijera.com 6|P a g e
1
2
2 22
12
1 11
n L
n
n L
where n1 and n2 are the number of turns of each side.
The coupling coefficient k has to be taken into
account in n12, thus getting the effective turns ratio ne
= k.n12. The minimum frequency fmin (Hz) at which
the primary winding can operate without saturating
the core, is estimated by applying a sinusoidal
waveform voltage as follows
4
10
b
a
c c op m c
P k f B V
m ax
m in
1
2 c s
V
f
n A B
where Vmax is the peak amplitude of the sinusoidal
voltage, and Bs is the saturation magnetic flux
density. At high frequencies the current density
becomes non uniform due to eddy currents which
cause skin effect. Hence, the transformer behavior
can be considered in the low-frequency region only if
the core skin depth is much greater than the core
thickness.
The power loss of the device PC is
calculated by evaluating the power dissipation in the
core due to eddy currents and hysteresis losses [5]
[6], and is expressed as:
4
10
b
a
c c op m c
P k f B V
where fop is the operating frequency, Bm is the
amplitude of the AC component of the magnetic flux
density, Vc = Ac·lc is the core volume, and kc, a, and
are constants for the core material.
III. METHODOLOGY
The proposed micro-transformer has been designed
in a FEM based Comsol Multiphysics software. A 2D
designed has been modeled and simulated and is
shown in Fig. 1. The design is on the basis of fractal
transformer as the primary coil design is repeating
itself periodically. The advantage of this kind of
design is that, this will induce stray fields thereby
reducing coupling between the primary and
secondary windings of the transformer. Also, there is
a a very small gap between the two coils. Air core
has been selected for this work. Since the dimensions
of the gaps are much smaller than those of the frame,
many mesh elements will be required for an accurate
model. The designed configuration is almost
symmetric. The input applied voltage selected for
simulation is 230 V, 50 Hz.
Fig 1: 2D schematic layout of the micro-transformer.
The parasitic capacitance exists due to transformer’s
lateral and vertical dimensions. The self inductance
of the primary and secondary coils of the transformer
depends upon the lateral dimensions. The trench
under the coils gradually decreases the parasitic
capacitance between the coils and the substrate. Also,
this trench helps in diminishing the eddy current
losses in the substrate that further helps in improving
the quality factor. To avoid high resistance in the
transformer it is necessary to increase the thickness
of the coil. Therefore, highly conductive material has
been selected as coil.
Fig 2: Schematic layout of the meshed device.
Fine meshing is applied to compensate the
computational load and is shown in Fig. 2. The inner
side of the core frame is manually restricted to a finer
element size in order to avoid inverted elements. For
rest of the geometry, low resolution is selected for a
fast and stable convergence of the solution without
the need of a tedious model optimization process.
3. Sahil Kumar Bhagat et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN: 2248-9622, Vol. 6, Issue 3, (Part - 2) March 2016, pp.05- 08
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IV. RESULTS AND DISCUSSIONS
Transient simulations of 2D with electrical analysis is
selected and studied under stationary frequency
domain. The simulation of the proposed model is
performed on a high end computational machine with
2.8 GHz processing speed and 4 GB RAM. The
electric displacement on the surface is shown in Fig.
3 while the average magnetic energy density is
shown in Fig. 4. The maximum electric displacement
obtained while simulating the micro-transformer as 2
x 10-11
C/m2
and the maximum magnetic energy
density obtained is 100 J/m3
.
Fig 3: Electrical displacement obtained after
simulating the micro-transformer.
Fig 4: Magnetic energy density obtained after
simulating the micro-transformer.
The results showed the proposed micro transformer
acts as step transformer as the input voltage applied
was 230 V ac but the voltage obtained at the
secondary is 325 V. The graph obtained between the
output voltage and the arc length is shown in Fig. 5.
This may be due to larger surface area of the
secondary coil in comparison to the primary coil.
Fig 5: Output voltage obtained after simulating the
micro-transformer.
Since the magnetic field exists within the transformer
and hence causes losses also. However, the amount
of losses in the proposed transformer is very small
due to air core used.
Fig 6: Electromagnetic heating inside micro-
transformer due to electric and magnetic field.
Fig. 6 shows the losses obtained due to
electromagnetic heating inside the micro-transformer
and the maximum value comes out to be 3 W/m3
.
Also, a high value of skin depth is always
advantageous for a transformer and the value
obtained during this simulation is 7 x 1011
0
A and is
shown in Fig 7.
Fig 7: Skin depth inside micro-transformer due to
electric and magnetic field.
V. CONCLUSION
In this paper, we have designed and analyzed a micro
transformer for MEMS and VLSI technology. The
proposed model is designed on a conducing substrate
with air core. A very input and high impedance value
exists within the design. It can be easily integrated
with signal and power isolation capability thus
reducing component count and improves system
reliability and lifetime. The results showed a
successful design implementation of a step-up micro
transformer with precise but very small magnetic
losses.
Focus of future work will be on
improvement of the numerical stability of the models
in order to extend their stable current amplitude and
frequency ranges.
4. Sahil Kumar Bhagat et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN: 2248-9622, Vol. 6, Issue 3, (Part - 2) March 2016, pp.05- 08
www.ijera.com 8|P a g e
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