An Augmented Electric Field Integral Equation For Layered Medium Green's Function,
2011
Missouri University of Science and Technology
An Augmented Electric Field Integral Equation For Layered Medium Green's Function, Yongpin P. Chen, Lijun Jiang, Zhi Guo Qian, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
This paper proposes an augmented electric field integral equation (A-EFIE) for layered medium Green's function. The newly developed matrix-friendly formulation of layered medium Green's function is applied in this method. By separating charge as extra unknown list, and enforcing the current continuity equation, the traditional EFIE can be cast into a generalized saddle-point system. Frequency scaling for the matrix-friendly formulation is analyzed when frequency tends to zero. Rank deficiency and the charge neutrality enforcement of the A-EFIE for layered medium Green's function is discussed in detail. The electrostatic limit of the A-EFIE is also analyzed. Without any topological loop-searching algorithm, …
Computational Intelligence In Wireless Sensor Networks: A Survey,
2011
Missouri University of Science and Technology
Computational Intelligence In Wireless Sensor Networks: A Survey, Raghavendra V. Kulkarni, Anna Förster, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
Wireless sensor networks (WSNs) are networks of distributed autonomous devices that can sense or monitor physical or environmental conditions cooperatively. WSNs face many challenges, mainly caused by communication failures, storage and computational constraints and limited power supply. Paradigms of computational intelligence (CI) have been successfully used in recent years to address various challenges such as data aggregation and fusion, energy aware routing, task scheduling, security, optimal deployment and localization. CI provides adaptive mechanisms that exhibit intelligent behavior in complex and dynamic environments like WSNs. CI brings about flexibility, autonomous behavior, and robustness against topology changes, communication failures and scenario changes. …
Universal Engineering Programmer – An In-House Development Tool For Developing And Testing Implantable Medical Devices In St. Jude Medical,
2011
California Polytechnic State University, San Luis Obispo
Universal Engineering Programmer – An In-House Development Tool For Developing And Testing Implantable Medical Devices In St. Jude Medical, Khoa Tat Do
Master's Theses
During development and testing of the functionality of the pacemaker and defibrillator device, engineers in the St. Jude Medical Cardiac Rhythm Management Division use an in-house development tool called Universal Engineering Programmer (UEP) to ensure the device functions as expected, before it can be used to test on an animal or a human during the implantation process. In addition, some applications of UEP are incorporated into the official releases of the device product. UEP has been developed and used by engineers across departments in the St. Jude Medical Cardiac Rhythm Management Division (CRMD). This thesis covers the flexible and reusable …
High Power Current Sensorless Bidirectional
16-Phase Interleaved Dc-Dc Converter For
Hybrid Vehicle Application,
2011
University of Nebraska-Lincoln
High Power Current Sensorless Bidirectional 16-Phase Interleaved Dc-Dc Converter For Hybrid Vehicle Application, Liqin Ni, Dean J. Patterson, Jerry L. Hudgins
Department of Electrical and Computer Engineering: Faculty Publications
A new 16-phase interleaved bidirectional dc/dc converter is developed featuring smaller input/output filters, faster dynamic response and lower device stress than conventional designs, for hybrid vehicle applications. The converter is connected between the ultracapacitor (UC) pack and the battery pack in a multisource energy storage system of a hybrid vehicle. Typically, multiphase interleaved converters require a current control loop in each phase to avoid imbalanced current between phases. This increases system cost and control complexity. In this paper, in order to minimize imbalance currents and remove the current control loop in each phase, the converter is designed to operate in …
Multiple-View Planetary Photogrammetry And Its Visualization,
2011
California Polytechnic State University, San Luis Obispo
Multiple-View Planetary Photogrammetry And Its Visualization, Kyle D. Husmann
Electrical Engineering
During the summer of 2010, Dr. Taemin Kim and Kyle Husmann jointly developed a novel new algorithm to generate topographical maps of planetary surfaces using a multiple-view photogrammetry approach. To evaluate and debug the algorithm, a program called mvpgui was developed to visualize and examine the objective function. After verifying the correct operation of the algorithm and mvpgui with synthetic data, it is run with real orbital data from the Apollo 15 mission. The results confirm the validity of the multiple-view algorithm as well as demonstrate the value of objective function visualization.
A Cooperative Diversity-Based Robust Mac Protocol In Wireless Ad Hoc Networks,
2011
Chosun University
A Cooperative Diversity-Based Robust Mac Protocol In Wireless Ad Hoc Networks, Sangman Moh, Chansu Yu
Electrical and Computer Engineering Faculty Publications
In interference-rich and noisy environment, wireless communication is often hampered by unreliable communication links. Recently, there has been active research on cooperative communication that improves the communication reliability by having a collection of radio terminals transmit signals in a cooperative way. This paper proposes a medium access control (MAC) algorithm, called Cooperative Diversity MAC (CD-MAC), which exploits the cooperative communication capability of the physical (PHY) layer to improve robustness in wireless ad hoc networks. In CD-MAC, each terminal proactively selects a partner for cooperation and lets it transmit simultaneously so that this mitigates interference from nearby terminals, and thus, improves …
Analysis Of Interband, Intraband, And Plasmon Polariton Transitions In Silver Nanoparticle Films Via In Situ Real-Time Spectroscopic Ellipsometry,
2011
Old Dominion University
Analysis Of Interband, Intraband, And Plasmon Polariton Transitions In Silver Nanoparticle Films Via In Situ Real-Time Spectroscopic Ellipsometry, S. A. Little, R. W. Collins, S. Marsillac
Electrical & Computer Engineering Faculty Publications
The dielectric function of Ag nanoparticle films, deduced from an analysis of in situ real-time spectroscopic ellipsometry (RTSE) measurements, is found to evolve with time during deposition in close consistency with the film structure, deduced in the same RTSE analysis. In the nucleation regime, the intraband dielectric function component is absent and plasmon polariton behavior dominates. Only at nuclei contact, does the intraband amplitude appear, increasing above zero. Both intraband and plasmon amplitudes coexist during surface smoothening associated with coalescence. The intraband relaxation time increases rapidly after surface smoothening is complete, also in consistency with the thin film structural evolution.
Touch2query Enabled Mobile Devices: A Case Study Using Openstreetmap And Iphone,
2011
Technological University Dublin
Touch2query Enabled Mobile Devices: A Case Study Using Openstreetmap And Iphone, Junjun Yin, James Carswell
Conference papers
This paper describes our mobile spatial interaction (MSI) prototype Touch2Query which presents the idea of using the touch screen on mobile devices to assist in performing ad-hoc spatial queries. This approach differs from conventional mobile LBS applications where the query shape (search space) is limited to either a bounding box or radius. Instead, we provide functionality that allows users to interactively draw any desired query shape overlaid on an area of interest directly on a mobile device with their finger by combining vector primitives such as circles, polygons, polylines, and points. With the help of location and orientation aware mobile …
A Review Of Neural Networking Methodology To Different Aspects Of Electrical Power Systems,
2011
University of North Dakota
A Review Of Neural Networking Methodology To Different Aspects Of Electrical Power Systems, Wafi Danesh, Sandip Bhowmick, Nomir Muktadir, Mohammad Alam
Electrical Engineering Student Publications
There is an ever increasing consumer base in the electrical power industry and with the rapid advancement in the field of electricity generation, electricity can now be supplied to many underdeveloped areas in impoverished locations, previously considered difficult or inaccessible. Along with this expansion, there is also the growing use of semiconductor electronic and solid state switching devices in everyday life. These devices are nonlinear loads and therefore produce severe distortions in the power flow. Providing a solution to the variety of problems that result from these applications requires the estimation and accurate analysis of the multitude of data available. …
A Proposal For Introduction Of Geothermal Energy To The Energy Sector Of Bangladesh,
2011
University of North Dakota
A Proposal For Introduction Of Geothermal Energy To The Energy Sector Of Bangladesh, Wafi Danesh, Sandip Bhowmick, Nomir Muktadir, Mohammad Alam
Electrical Engineering Student Publications
Due to the rapid industrialization over the last two decades, Bangladesh has witnessed a high demand for uninterrupted electricity, which keeps on increasing every day. With the power sector in Bangladesh beset by many infrastructural problems such as an inefficient transmission system, overdependence on natural gas reserves and a cumbersome decision making process for expansion of current power system to name a few, it has become the imperative to seek new energy sources that are relatively cheap, quick to set up and operate and have a low overall loss. The current energy demand stands at around 5,500 MW against a …
A Proposal For Large Scale Electricity Generation From High Pressure Applications Using Piezoelectric Materials,
2011
University of North Dakota
A Proposal For Large Scale Electricity Generation From High Pressure Applications Using Piezoelectric Materials, Wafi Danesh, Sandip Bhowmick, Nomir Muktadir, Mohammad Alam
Electrical Engineering Student Publications
At present, a great deal of research effort has been directed to finding eco-friendly and renewable sources of energy. With the rising costs of crude oil and petroleum, along with the derogatory effects that they pose to the environment, this sort of approach is of utmost importance. This has also led to the search for alternate methods of transforming the various forms of energy into electrical form. Popular renewable energy sources such as hydropower, solar power and wind power require massive financial investments, give comparatively much lower power output, and have a low scale of efficiency. Nuclear power offers a …
Iterative Construction Of Regular Ldpc Codes From
Independent Tree-Based Minimum Distance Bounds,
2011
University of Nebraska-Lincoln
Iterative Construction Of Regular Ldpc Codes From Independent Tree-Based Minimum Distance Bounds, Eric T. Psota, Lance C. Perez
Department of Electrical and Computer Engineering: Faculty Publications
An independent tree-based method for lower bounding the minimum distance of low-density parity-check (LDPC) codes is presented. This lower-bound is then used as the decision criterion during the iterative construction of regular LDPC codes. The new construction algorithm results in LDPC codes with greater girth and improved minimum-distance bounds when compared to regular LDPC codes constructed using the progressive edge-growth (PEG) construction and the approximate cycle extrinsic message degree (ACE)-constrained PEG construction. Simulation results of codes constructed with the new method show improved performance on the additive white Gaussian noise channel at moderate signal-to-noise ratios.
Oversampled Orthogonal Frequency Division Multiplexing In Doubly Selective Fading Channels,
2011
Missouri University of Science and Technology
Oversampled Orthogonal Frequency Division Multiplexing In Doubly Selective Fading Channels, Jingxian Wu, Yahong Rosa Zheng
Electrical and Computer Engineering Faculty Research & Creative Works
A new oversampled orthogonal frequency division multiplexing (OOFDM) scheme is proposed for doubly selective fading environment. the proposed OOFDM scheme employs oversampling in the time domain and linear processing in the frequency domain, both at the receiver without changing the structure of conventional orthogonal frequency division multiplexing (OFDM) transmitters. the time-frequency processing enables a two-dimensional Doppler-frequency grid of the fading channel, such that each data symbol is modeled equivalently as being transmitted at multiple subcarriers and various Doppler spreads simultaneously, while retaining the same spectral efficiency as conventional OFDM systems. Optimum combining ensures coherent combining of the data samples spread …
Particle Swarm Optimization In Wireless-Sensor Networks: A Brief Survey,
2011
Missouri University of Science and Technology
Particle Swarm Optimization In Wireless-Sensor Networks: A Brief Survey, Raghavendra V. Kulkarni, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
Wireless-sensor networks (WSNs) are networks of autonomous nodes used for monitoring an environment. Developers of WSNs face challenges that arise from communication link failures, memory and computational constraints, and limited energy. Many issues in WSNs are formulated as multidimensional optimization problems and approached through bioinspired techniques. Particle swarm optimization (PSO) is a simple, effective, and computationally efficient optimization algorithm. It has been applied to address WSN issues such as optimal deployment, node localization, clustering, and data aggregation. This paper outlines issues in WSNs, introduces PSO, and discusses its suitability for WSN applications. It also presents a brief survey of how …
Preparation And Electrochemical Properties Of Sn Thin Film As Anode Materials For Lithium-Ion Batteries,
2011
Institute of New Energy and Material Chemistry,Key Laboratory of Advanced Energy Materials Chemistry-Ministry of Education,Nankai University,Tianjin 300071,China;
Preparation And Electrochemical Properties Of Sn Thin Film As Anode Materials For Lithium-Ion Batteries, Hong-Mei Bai, Zhan-Liang Tao, Fang-Yi Cheng, Jun Chen
Journal of Electrochemistry
Sn thin films as the anode materials of Li-ion batteries were prepared by vacuum-evaporation method on the copper foam substrate. The phase structure,surface morphology and electrochemical property of the as-prepared films were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM), and galvanostatic cycling. The results showed that three-dimensional structure of copper foam substrate enhanced the adhesion strength between the active material and the substrate, under the same substrate temperature, the particles became bigger with the increasing of evaporation time, while their electrochemical property decreased, under the same evaporation time, the particles didn′t changed obviously with the increasing of substrate temperature,while their cycle …
Synthesis Of Mesoporous Nickel Oxide For Supercapacitor Application,
2011
School of Chemistry and Chemical Engineering,Key Laboratory of Analytical Chemistry for Life Science(MOE),Nanjing University,Nanjing 210008,China;
Synthesis Of Mesoporous Nickel Oxide For Supercapacitor Application, Xuan-Xuan Chen, Zhen-Zhen Zhao, Deng-Chao Wang, Zhong-Jie Huang, Wen-Bin Ni, Li Yu, Jian-Wei Zhao
Journal of Electrochemistry
Mesoporous nickel oxide has been synthesized by calcining metal-organic coordination precursor.Transmission electron microscopy and BET test showed that the prepared NiO had a regular morphology and displayed a narrow size distribution.Electrochemical tests revealed that such mesoporous NiO had a specific capacity of 72 F·g-1 at the current of 2.0 A·g-1.Futhermore,the material showed excellent cycle-life stability.There was no degradation of capacitance after 1000 cycles.
Electrochemical Double-Layer Capacitors Using Phenolic Resin-Based Carbon Fibers,
2011
Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;
Electrochemical Double-Layer Capacitors Using Phenolic Resin-Based Carbon Fibers, Rong Xue, Jing-Wang Yan, Ying Tian, Bao-Lian Yi
Journal of Electrochemistry
Phenolic resin-based activated carbon fiber(ACF) was prepared by KOH activation.The electrochemical properties of pulverized phenolic resin-based carbon fiber(P-ACF) were examined in 6 mol·L-1 KOH compared with that of the original ACF.P-ACF exhibited a better capacitive behavior and showed a larger specific capacitance(200 F·g-1) as well as a lower capacitance decrease at high current densities.The pore resistance for ion migration(Rp) in P-ACF was lower(2.96 Ω) than that in ACF(4.65 Ω).Pulverization increased the exposure of the cross section,lowered the contact resistance between the carbon fibers and decreased the pore resistance for ion migration.
Low-Temperature Performance Of Li-Ion Battery With Fluoroethylene Carbonate Electrolyte,
2011
Beijing Higher Institution Engineering Research Center of Power Battery and Chemical Energy Materials School of Chemical Engineering and Environment Science,Beijing Institute of Technology, Beijing 100081,China;
Low-Temperature Performance Of Li-Ion Battery With Fluoroethylene Carbonate Electrolyte, Chun-Wei Yang, Feng Wu, Bo-Rong Wu, Yong-Huan Ren, Jing-Wen Yao
Journal of Electrochemistry
The low temperature performance of electrolytes containing FEC including FEC+EMC, EC and PC, as well as the compatibility of electrolytes with LiFePO4 anode and with MCMB cathode were investigated.The electrolyte exhibits a high value of ionic conductivity at low temperature.The stability of cathode was enhanced by the formation of SEI film at 1.6 V as a result of FEC reaction. The infrared spectra showed that FEC can suppress decomposition of other solvents during SEI formation, and lower the resistance of SEI on MCMB cathode. The electrochemistry test indicates that Li-ion batteries with FEC electrolyte display high capacity at low …
Novel Anion Exchange Membranes Base On Copolymer Of 2-(Diethylamino) Ethyl Methacrylate And Fluoro-Polyacrylate For Alkaline Direct Methanol Fuel Cells,
2011
College Chemistry & Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China;
Novel Anion Exchange Membranes Base On Copolymer Of 2-(Diethylamino) Ethyl Methacrylate And Fluoro-Polyacrylate For Alkaline Direct Methanol Fuel Cells, Yan-Mei Zhang, Jun Fang, Ge Yan, Yong-Ze Zhuang
Journal of Electrochemistry
Anion exchange membrane fuel cells,which use anion exchange membranes as polyelectrolytes,have attracted more and more research interests recently.In this work,a series of hydroxyl-conducting anion-exchange membranes based on the copolymer of 2-(Diethylamino)ethyl methacrylate and fluoro-polyacrylate were prepared by radical polymerization,and their potential applications in alkaline fuel cells were assessed.It was shown that the ionic conductivity of the membranes reached 10-2 S·cm-1 at room temperature,while the methanol permeability was lower than 10-7 cm2·s-1.The maximum power density of fuel cell assembled with this membrane was achieved to be 43.2 mW·cm-2 at room temperature,indicating possible application …
A Titanium-Supported Nanoporous Pd Electrocatalyst For Methanol Oxidation,
2011
School of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China;
A Titanium-Supported Nanoporous Pd Electrocatalyst For Methanol Oxidation, Feng-Juan Niu, Qing-Feng Yi
Journal of Electrochemistry
Titanium-supported nanoporous palladium electrode(nanoPd /Ti) was prepared by a hydrothermal process in the presence of the ligand EDTA and using formaldehyde as reducing agent.SEM images showed that the size of Pd particles was about 60 nm and the Pd particles were connected with each other to form a three-dimensional network structure.Cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) were applied to evaluate the electrocatalytic activity of the nanoPd/Ti electrode towards methanol oxidation in alkaline solution.CV results showed that the nanoPd /Ti electrode presented high anodic peak densities and a low onset potential for methanol oxidation.Also nanoPd /Ti electrode showed excellent CO tolerance …
