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Articles 13561 - 13590 of 33681
Full-Text Articles in Entire DC Network
Method For Determining The Dielectric Constant Of Particles, Vladimir Petrovsky, Fatih Dogan
Method For Determining The Dielectric Constant Of Particles, Vladimir Petrovsky, Fatih Dogan
Materials Science and Engineering Faculty Research & Creative Works
A method of measuring the dielectric constant of a powder, including selecting a powder having an unknown first dielectric constant, selecting a liquid having a known second dielectric constant, and introducing a predetermined amount of powder into a predetermined volume of liquid to define a slurry characterized by a known volume fraction of powder. Next, the impedance spectra of the slurry are plotted over a predetermined frequency range, the measured dielectric constant data is read and the appropriate equivalent circuit for the slurry is determined. Appropriate equivalent circuit equations are applied to the measured dielectric constant data, and the first …
Effects Of Variable Solar Irradiance On The Reactive Power Compensation For Large Solar Farm, Dustin F. Howard, Ronald G. Harley, Jiaqi Liang, Ganesh K. Venayagamoorthy
Effects Of Variable Solar Irradiance On The Reactive Power Compensation For Large Solar Farm, Dustin F. Howard, Ronald G. Harley, Jiaqi Liang, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
Dish-Stirling systems are a form of concentrating solar power (CSP) emerging as an efficient and reliable source of renewable energy. Various technical hurdles are involved in the grid interconnection of dish-Stirling systems, particularly with issues related to power factor correction, low voltage ride-through capability, and reactive power planning. While there are no grid-interconnection requirements specific to dish-Stirling technology, the requirements currently established for wind farms are used as a starting point due to the similar design and operating characteristics between wind farms and dish-Stirling solar farms. a dish-Stirling solar farm requires external reactive power compensation to meet the power factor …
Foundations For Dynamic Loads, Vijay K. Puri, Shamsher Prakash
Foundations For Dynamic Loads, Vijay K. Puri, Shamsher Prakash
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Design of foundations in earthquake prone areas needs special considerations. Shallow foundations may experience a reduction in bearing capacity and increase in settlement and tilt due to seismic loading. the reduction in bearing capacity depends on the nature and type of soil and ground acceleration parameters. in the case of piles, the soil-pile behavior under earthquake loading is generally nonlinear. the nonlinearity must be accounted for by defining soil-pile stiffness in terms of strain dependent soil modulus. a comparison of observed and predicted pile behavior under dynamic loads has attracted the attention of several investigators. the lateral dynamic pile response …
Estimation Of Voltage Stability Index In A Power System With Plug-In Electric Vehicles, K. Joseph Makasa, Ganesh K. Venayagamoorthy
Estimation Of Voltage Stability Index In A Power System With Plug-In Electric Vehicles, K. Joseph Makasa, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
A Multilayer Perceptron (MLP) neural network-based approach for estimation of the voltage stability L-index in a power system with Plug-in Electric Vehicles (PEVs) is presented. This technique overcomes the limitations of direct calculation of L-index from measurements at a load bus. the L-index calculation is dependent upon the no-load voltage phasor for any given system topology and operating condition. in practice it is difficult to obtain no-load voltage phasor at a bus each time the system topology or operating point changes. an MLP neural network-based method capable of estimating voltage stability L-index at a load bus using direct measurements and …
The Missouri Miner, October 21, 2010
The Missouri Miner, October 21, 2010
The Missouri Miner Newspaper
No abstract provided.
Preventing Information Leakage From Indexing In The Cloud, Anna Squicciarini, Smitha Sundareswaran, Dan Lin
Preventing Information Leakage From Indexing In The Cloud, Anna Squicciarini, Smitha Sundareswaran, Dan Lin
Computer Science Faculty Research & Creative Works
Cloud computing enables highly scalable services to be easily consumed over the Internet on an as-needed basis. While cloud computing is expanding rapidly and used by many individuals and organizations internationally, data protection issues in the cloud have not been carefully addressed at current stage. Users' fear of confidential data (particularly financial and health data) leakage and loss of privacy in the cloud may become a significant barrier to the wide adoption of cloud services. in this paper, we explore a newly emerging problem of information leakage caused by indexing in the cloud. We design a three-tier data protection architecture …
Labyrinthine Instability In Thin Liquid Films, P. Neogi
Labyrinthine Instability In Thin Liquid Films, P. Neogi
Chemical and Biochemical Engineering Faculty Research & Creative Works
When a thin liquid film on a solid surface has a thickness corresponding to a particular part the spinodal region of the disjoining pressure versus thickness isotherm, the film breaks down. One of the patterns that emerges on the breakdown has been referred to as wavy instability. It is compared here to the labyrinthine instability seen in magnetic films. the system is modeled following the procedure used in magnetic systems, and the pattern of wavy instability is broken down into a curved thick-thin film in equilibrium with a flat thin-thin film of constant thickness. Minimization of free energy leads to …
Optofluidic Biosensors Based On Color Imaging, Jongwon Park, Chang-Soo Kim
Optofluidic Biosensors Based On Color Imaging, Jongwon Park, Chang-Soo Kim
Electrical and Computer Engineering Faculty Research & Creative Works
A color CCD (charge-coupled device) camera is used as a chemical detector to quantify fluorescence emission intensities from two kinds of optofluidic device platforms. the fluorophores responsive to oxygen are immobilized in photo-patternable hydrogel matrices. the first device is a hydrogel sensor array formed within a commercial silicone elastomer imaging chamber. the second one involves a double-chamber fluidic device composed of a permeable membrane layer and dry film photoresist layers. the results suggest that digital color imagers, in combination with a simple color separation method, can serve as the high-quality chemical detectors for fluidic biosensors and biological culture platforms. © …
The Missouri Miner, Octoner 14, 2010
The Missouri Miner, Octoner 14, 2010
The Missouri Miner Newspaper
No abstract provided.
Faculty Senate Minutes October 14, 2010, Missouri University Of Science And Technology Faculty Senate
Faculty Senate Minutes October 14, 2010, Missouri University Of Science And Technology Faculty Senate
Minutes & Agendas
No abstract provided.
Color Intensity Method For Hydrogel Oxygen Sensor Array, Jongwon Park, Wonhak Hong, Chang-Soo Kim
Color Intensity Method For Hydrogel Oxygen Sensor Array, Jongwon Park, Wonhak Hong, Chang-Soo Kim
Electrical and Computer Engineering Faculty Research & Creative Works
The oxygen imaging technique to obtain a 2-D distribution is a convenient method because it does not require individual addressing of each sensing element in a sensor array. Until recently, color charge coupled devices (CCDs) have rarely been used for oxygen imaging in spite of usefulness for analyzing the spectral content of images. in this work, a color CCD camera was used for luminescence intensity imaging. Two methods of color intensity analysis are investigated and compared. the first method is to analyze the total Red-Green-Blue (RGB) color intensity of the original color image. the second method involves extracting the red …
The Missouri Miner, October 7, 2010
The Missouri Miner, October 7, 2010
The Missouri Miner Newspaper
No abstract provided.
Analysis Of Nonlinear Spectral Eddy-Viscosity Models Of Turbulence, Max Gunzburger, Eunjung Lee, Yuki Saka, Catalin Trenchea, Xiaoming Wang
Analysis Of Nonlinear Spectral Eddy-Viscosity Models Of Turbulence, Max Gunzburger, Eunjung Lee, Yuki Saka, Catalin Trenchea, Xiaoming Wang
Mathematics and Statistics Faculty Research & Creative Works
Fluid turbulence is commonly modeled by the Navier-Stokes equations with a large Reynolds number. However, direct numerical simulations are not possible in practice, so that turbulence modeling is introduced. We study artificial spectral viscosity models that render the simulation of turbulence tractable. We show that the models are well posed and have solutions that converge, in certain parameter limits, to solutions of the Navier-Stokes equations. We also show, using the mathematical analyses, how effective choices for the parameters appearing in the models can be made. Finally, we consider temporal discretizations of the models and investigate their stability. © 2009 Springer …
Toxicity Of Transition Metal Oxide Nanoparticles: Recent Insights From In Vitro Studies, Yue-Wern Huang, Chi-Heng Wu, Robert Aronstam
Toxicity Of Transition Metal Oxide Nanoparticles: Recent Insights From In Vitro Studies, Yue-Wern Huang, Chi-Heng Wu, Robert Aronstam
Biological Sciences Faculty Research & Creative Works
Nanotechnology has evolved to play a prominent role in our economy. Increased use of nanomaterials poses potential human health risk. It is therefore critical to understand the nature and origin of the toxicity imposed by nanomaterials (nanotoxicity). In this article we review the toxicity of the transition metal oxides in the 4th period that are widely used in industry and biotechnology. Nanoparticle toxicity is compellingly related to oxidative stress and alteration of calcium homeostasis, gene expression, pro-inflammatory responses, and cellular signaling events. The precise physicochemical properties that dictate the toxicity of nanoparticles have yet to be defined, but may include …
Opportunistic Cooperation For Multi-Antenna Multi-Relay Networks, Weiliang Zeng, Chengshan Xiao, Youzheng Wang, Jianhua Lu
Opportunistic Cooperation For Multi-Antenna Multi-Relay Networks, Weiliang Zeng, Chengshan Xiao, Youzheng Wang, Jianhua Lu
Electrical and Computer Engineering Faculty Research & Creative Works
A low-complexity, near-optimal transmit antenna selection algorithm is proposed for multi-relay networks where all nodes are equipped with multiple antennas. We first establish a system model and a unified capacity maximization framework for a two-hop opportunistic relaying scheme where the source node (S) transmits signals to multiple relay nodes (R) in the first time slot, and the selected relay antennas and their corresponding relay nodes receive, decode and forward the messages to the destination (D) in the second time slot. based on the system model, we develop a transmit antenna selection algorithm that maximizes the network capacity assuming that the …
Intelligent Coordinated Control Of A Wind Farm And Distributed Smartparks, Pinaki Mitra, Ganesh K. Venayagamoorthy
Intelligent Coordinated Control Of A Wind Farm And Distributed Smartparks, Pinaki Mitra, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
Energy storage is generally recommended in presence of an intermittent source like wind farm for a better control over the power generation from the wind turbine with the variation of the wind speed. In this paper, the potential of plug-in electric vehicle parking lot (SmartPark) as an energy storage in a power system with a large wind farm has been investigated. Also, a fuzzy logic based coordination controller of the wind farm and the distributed SmartParks has been proposed in this paper. The fuzzy controller uses the total state-of-charge of the SmartParks and the difference between instantaneous demand and the …
Optimized Waveform Relaxation Solution Of Electromagnetic And Circuit Problems, Martin J. Gander, Albert E. Ruehli
Optimized Waveform Relaxation Solution Of Electromagnetic And Circuit Problems, Martin J. Gander, Albert E. Ruehli
Electrical and Computer Engineering Faculty Research & Creative Works
New algorithms are needed to solve electromagnetic problems using today's widely available parallel processors. In this paper, we show that applying the optimized waveform relaxation approach to a partial element equivalent circuit will yield a powerful technique for solving electromagnetic problems with the potential for a large number of parallel processor nodes.
Pso Tuned Flatness Based Control Of A Magnetic Levitation System, Ganesh K. Venayagamoorthy, E. C. Anene
Pso Tuned Flatness Based Control Of A Magnetic Levitation System, Ganesh K. Venayagamoorthy, E. C. Anene
Electrical and Computer Engineering Faculty Research & Creative Works
Investigation on the application of flatness-based feedback linearization to the magnetic levitation model of INTECOTm Maglev system is presented in this paper. The MAGLEV system dynamics studied consists of a set of third order nonlinear differential equations. Using computational techniques proposed by Levine, it is verified that the ball position is the flat output. The derived flat output is applied in the construction of a nonlinear control law used to control the levitation to a set point as well as tracking a sine function trajectory. The controller gains are obtained and optimized using particle swarm optimization. The simulation results compared …
The Effect Of Ionic Dissolution Products Of Ca-Sr-Na-Zn-Si Bioactive Glass On In Vitro Cytocompatibility, S. Murphy, A. W. Wren, Mark R. Towler, D. Boyd
The Effect Of Ionic Dissolution Products Of Ca-Sr-Na-Zn-Si Bioactive Glass On In Vitro Cytocompatibility, S. Murphy, A. W. Wren, Mark R. Towler, D. Boyd
Chemical and Biochemical Engineering Faculty Research & Creative Works
Many commercial bone grafts cannot regenerate healthy bone in place of diseased bone. Bioactive glasses have received much attention in this regard due to the ability of their ionic dissolution products to promote cell proliferation, cell differentiation and activate gene expression. Through the incorporation of certain ions, bioactive glasses can become therapeutic for specific pathological situations. Calcium-strontium-sodium-zinc-silicate glass bone grafts have been shown to release therapeutic levels of zinc and strontium, however the in vitro compatibility of these materials is yet to be reported. In this study, the in vitro cytocompatibility of three different calcium-strontium-sodium-zinc-silicate glasses was examined as a …
An Automated Phenotype-Driven Approach (Geneforce) For Refining Metabolic And Regulatory Models, Dipak Barua, Joonhoon Kim, Jennifer L. Reed
An Automated Phenotype-Driven Approach (Geneforce) For Refining Metabolic And Regulatory Models, Dipak Barua, Joonhoon Kim, Jennifer L. Reed
Chemical and Biochemical Engineering Faculty Research & Creative Works
Integrated constraint-based metabolic and regulatory models can accurately predict cellular growth phenotypes arising from genetic and environmental perturbations. Challenges in constructing such models involve the limited availability of information about transcription factor-gene target interactions and computational methods to quickly refine models based on additional datasets. In this study, we developed an algorithm, GeneForce, to identify incorrect regulatory rules and gene-protein-reaction associations in integrated metabolic and regulatory models. We applied the algorithm to refine integrated models of Escherichia coli and Salmonella typhimurium, and experimentally validated some of the algorithm's suggested refinements. The adjusted E. coli model showed improved accuracy …
Technical Target Setting In Qfd For Web Service Systems Using An Artificial Neural Network, Lianzhang Zhu, Xiaoqing Frank Liu
Technical Target Setting In Qfd For Web Service Systems Using An Artificial Neural Network, Lianzhang Zhu, Xiaoqing Frank Liu
Computer Science Faculty Research & Creative Works
There are at least two challenges with quality management of service-oriented architecture based web service systems: 1) how to link its technical capabilities with customer's needs explicitly to satisfy customers' functional and nonfunctional requirements; and 2) how to determine targets of web service design attributes. Currently, the first issue is not addressed and the second one is dealt with subjectively. Quality Function Deployment (QFD), a quality management system, has found its success in improving quality of complex products although it has not been used for developing web service systems. In this paper, we analyze requirements for web services and their …
Distributed Power Balancing For The Freedm System, Rav Akella, Fanjun Meng, Derek Ditch, Bruce M. Mcmillin, Mariesa Crow
Distributed Power Balancing For The Freedm System, Rav Akella, Fanjun Meng, Derek Ditch, Bruce M. Mcmillin, Mariesa Crow
Computer Science Faculty Research & Creative Works
The FREEDM microgrid is a test bed for a smart grid integrated with Distributed Grid Intelligence (DGI) to efficiently manage the distribution and storage of renewable energy. Within the FREEDM system, DGI applies distributed algorithms in a unique way to achieve economically feasible utilization and storage of alternative energy sources in a distributed fashion. The FREEDM microgrid consists of residential or industrial nodes with each node running a portion of the DGI process called Intelligent Energy Management (IEM). Such IEM nodes within FREEDM coordinate among themselves to efficiently and economically manage their power generation, utility and storage. Among a variety …
Experimental Estimation Of The Gpr Groundwave Sampling Depth, Katherine R. Grote, Taylor Crist, Crystal Nickel
Experimental Estimation Of The Gpr Groundwave Sampling Depth, Katherine R. Grote, Taylor Crist, Crystal Nickel
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Monitoring near-surface soil water content is essential for efficient water management and for understanding hydrologic processes in soils. Ground-penetrating radar (GPR) groundwaves are an approach that can be used to monitor the near-surface soil water content, but the efficacy of this technique is currently limited by the uncertainty surrounding the groundwave sampling depth. This research experimentally determines the sampling depth of GPR groundwaves under dry and saturated conditions in a sandy soil. Data were acquired using 250, 500, and 1000 MHz antennas within an experimental tank containing soil layers of contrasting electromagnetic velocities. Results show that the groundwave sampling depth …
Comparison Of Antibacterial Properties Of Commercial Bone Cements And Fillers With A Zinc-Based Glass Polyalkenoate Cement, A. W. Wren, N. M. Cummins, Mark R. Towler
Comparison Of Antibacterial Properties Of Commercial Bone Cements And Fillers With A Zinc-Based Glass Polyalkenoate Cement, A. W. Wren, N. M. Cummins, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
Postoperative infection following invasive surgical procedures is a significant cause for concern, particularly in spinal reconstructive surgery. The objective of this study is to compare the antibacterial efficacy of a novel zinc-based glass polyalkenoate cement (Zn-GPC) based on 0.04SrO-0.12CaO-0.36ZnO- 0.48SiO2 glass, to a number of commercially available bone cements and fillers including Simplex P + Tobramycin (STob), Spineplex (Spine) and Novabone Putty (NPut). The agar diffusion test was performed on each material against Escherichia coli, Staphlococcus epidermidis, Pseudomonas aeruginosa and Staphlococcus Aureus. STob was found to produce large inhibition zones in each …
Anderson Localization As Position-Dependent Diffusion In Disordered Waveguides, Ben Payne, Alexey Yamilov, Sergey E. Skipetrov
Anderson Localization As Position-Dependent Diffusion In Disordered Waveguides, Ben Payne, Alexey Yamilov, Sergey E. Skipetrov
Physics Faculty Research & Creative Works
We show that the recently developed self-consistent theory of Anderson localization with a position-dependent diffusion coefficient is in quantitative agreement with the supersymmetry approach up to terms of the order of 1 / g20 (with g0 the dimensionless conductance in the absence of interference effects) and with large-scale ab initio simulations of the classical wave transport in disordered waveguides, at least for g0 ≥ 0.5. In the latter case, agreement is found even in the presence of absorption. Our numerical results confirm that in open disordered media, the onset of Anderson localization can be viewed as …
Dynamical Conductivity At The Dirty Superconductor-Metal Quantum Phase Transition, Adrian Del Maestro, Bernd Rosenow, Jose A. Hoyos, Thomas Vojta
Dynamical Conductivity At The Dirty Superconductor-Metal Quantum Phase Transition, Adrian Del Maestro, Bernd Rosenow, Jose A. Hoyos, Thomas Vojta
Physics Faculty Research & Creative Works
We study the transport properties of ultrathin disordered nanowires in the neighborhood of the superconductor-metal quantum phase transition. To this end we combine numerical calculations with analytical strong-disorder renormalization group results. The quantum critical conductivity at zero temperature diverges logarithmically as a function of frequency. In the metallic phase, it obeys activated scaling associated with an infinite-randomness quantum critical point. We extend the scaling theory to higher dimensions and discuss implications for experiments.
Erratum: Determination Of Structure Parameters In Strong-Field Tunneling Ionization Theory Of Molecules (Physical Review A (2010) 81 (033423)), Song-Feng Zhao, Cheng Jin, Anh-Thu Le, T. F. Jiang, C. D. Lin
Erratum: Determination Of Structure Parameters In Strong-Field Tunneling Ionization Theory Of Molecules (Physical Review A (2010) 81 (033423)), Song-Feng Zhao, Cheng Jin, Anh-Thu Le, T. F. Jiang, C. D. Lin
Physics Faculty Research & Creative Works
There are several errors in Tables V and VI of our article. In Table V, the C2m of the HOMO-1 (1π) of CO molecule should be 0.014. In Table VI, the binding energies of 2pπg and 2pπu of H₂⁺ should be 0.2267 and 0.4288, respectively.
Thermodynamics Of Strained Vanadium Dioxide Single Crystals, Yijia Gu, Jinbo Cao, Junqiao Wu, Long-Qing Chen
Thermodynamics Of Strained Vanadium Dioxide Single Crystals, Yijia Gu, Jinbo Cao, Junqiao Wu, Long-Qing Chen
Materials Science and Engineering Faculty Research & Creative Works
Vanadium dioxide undergoes a metal-insulator transition, in which the strain condition plays an important role. To investigate the strain contribution, a phenomenological thermodynamic potential for the vanadium dioxide single crystal was constructed. The transformations under the uniaxial stress, wire, and thin film boundary conditions were analyzed, and the corresponding phase diagrams were constructed. The calculated phase diagrams agree well with existing experimental data, and show that the transformation temperature (and Curie temperature) strongly depends on the strain condition.
Evaluation Of Computational Techniques For Solving The Boltzmann Transport Equation For Lattice Thermal Conductivity Calculations, Aleksandr V. Chernatynskiy, Simon R. Phillpot
Evaluation Of Computational Techniques For Solving The Boltzmann Transport Equation For Lattice Thermal Conductivity Calculations, Aleksandr V. Chernatynskiy, Simon R. Phillpot
Physics Faculty Research & Creative Works
Three methods for computing thermal conductivity from lattice dynamics (the iterative method, the variational method, and the relaxation-time approximation) are compared for the prototypical case of solid argon. The iterative method is found to produce results in close agreement with Green-Kubo molecular-dynamics simulations, a formally correct method for computing thermal conductivity. The variational method and relaxation-time approximation are found to underestimate the thermal conductivity. The relationship among the methods is established; a combination of the iterative and variational methods is found to have a fastest convergence. Formal convergence of the iterative method is demonstrated and a simple mixing rule is …
Analysis Of Microstructural Evolution During Friction Stir Welding Of Ultrahigh-Strength Steel, M. Ghosh, K. Kumar, R. S. Mishra
Analysis Of Microstructural Evolution During Friction Stir Welding Of Ultrahigh-Strength Steel, M. Ghosh, K. Kumar, R. S. Mishra
Materials Science and Engineering Faculty Research & Creative Works
Friction stirs lap-welded advanced high-strength M190 steel exhibited formation of lath martensite at weld nuggets, a ferrite layer at faying surfaces and a ferrite-pearlite microstructure at the bottom of the stir zone. the phase transformation was governed by severe plastic deformation in the austenitic region followed by cooling. the strain rate and peak temperature played key roles in controlling the prior-austenitic grain size and were correlated to the Zener-Hollomon parameter. an empirical relationship has been obtained for dynamically recrystallized austenite grains. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.