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Freeze-Form Extrusion Fabrication Of Composite Structures, Ming-Chuan Leu, Lie Tang, Bradley K. Deuser, Robert G. Landers, Greg Hilmas, Shi C. Zhang, Jeremy Lee Watts Aug 2011

Freeze-Form Extrusion Fabrication Of Composite Structures, Ming-Chuan Leu, Lie Tang, Bradley K. Deuser, Robert G. Landers, Greg Hilmas, Shi C. Zhang, Jeremy Lee Watts

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A Freeze-form Extrusion Fabrication (FEF) process capable of making three-dimensional (3D) parts and structures with graded composite materials is presented in this paper. The process development includes the design and manufacture of a gantry machine with a triple-extruder mechanism and the associated electronics hardware and computer software for fabricating functionally graded parts from multiple aqueous pastes. A rheological behavior study with Al2O3 paste is performed to identify an efficient binder for transforming the paste into a pseudoplastic with a high yield stress. A green part is first fabricated using the triple-extruder FEF machine in a layer-by-layer manner …

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Special Issue On The 6th International Phytotechnologies Conference, St. Louis, Missouri, 2009: Conference Review, Joel G. (Gerard) Burken, Jason C. White Aug 2011

Special Issue On The 6th International Phytotechnologies Conference, St. Louis, Missouri, 2009: Conference Review, Joel G. (Gerard) Burken, Jason C. White

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

No abstract provided.

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Electron Loss From Fast Heavy Ions: Target-Scaling Dependence, Robert D. Dubois, A. C.F. Santos, G. M. Sigaud, E. C. Montenegro Aug 2011

Electron Loss From Fast Heavy Ions: Target-Scaling Dependence, Robert D. Dubois, A. C.F. Santos, G. M. Sigaud, E. C. Montenegro

Physics Faculty Research & Creative Works

The target dependence for projectile electron loss is investigated using experimental data taken from the literature. Impact energies range from a few tens of eV/u to tens of MeV/u. for energies less than several MeV/u, the target dependences are shown to be very similar, independent of projectile species and charge state. overall, however, with increasing impact energy the cross-section dependence on the target nuclear charge systematically increases. It is shown that none of the existing cross-section target scaling models reproduce these features. a model, based on Born scaling and including both the Anti screening and screening contributions to projectile electron …

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The Integrate-And-Fire Sampler: A Special Type Of Asynchronous ∑-Δ Modulator, Alexander Singh Alvarado, Manu Rastogi, John G. Harris, Jose C. Principe Aug 2011

The Integrate-And-Fire Sampler: A Special Type Of Asynchronous ∑-Δ Modulator, Alexander Singh Alvarado, Manu Rastogi, John G. Harris, Jose C. Principe

Electrical and Computer Engineering Faculty Research & Creative Works

We present the integrate-and-fire (IF) model as a time encoding scheme and show that it corresponds to a special case of the asynchronous - modulator (ASDM). We depart from typical rate-based encoding used by conventional ASDM towards time-based encoding. We show that for certain families of signals, such as neural recordings, the IF sampler accurately encodes the regions of interest at sub-Nyquist data rates. Nevertheless, the encoder requires nonlinear recovery algorithms, instead of the typical low pass filter. © 2011 IEEE.

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The Time Machine: A Novel Spike-Based Computation Architecture, Vaibhav Garg, Ravi Shekhar, John G. Harris Aug 2011

The Time Machine: A Novel Spike-Based Computation Architecture, Vaibhav Garg, Ravi Shekhar, John G. Harris

Electrical and Computer Engineering Faculty Research & Creative Works

A novel spike-based computation architecture has been developed which represents synaptic weights in time. An analog chip with 32 neurons, 1024 synapses and an AER block has been fabricated in 0.5μm technology. A digital implementation of the architecture having 6,144 neurons and 100,352 synapses on an FPGA is also described. A digital controller for routing spikes can processes up to 34 million synapses per second. The architecture is called the time machine as it operates on timing events and uses time to store weights. The time machine is general enough for implementing many spike-based algorithms yet provides flexibility and configurability. …

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Process-Variation-Aware Electromagnetic-Semiconductor Coupled Simulation, Yuanzhe Xu, Quan Chen, Lijun Jiang, Ngai Wong Aug 2011

Process-Variation-Aware Electromagnetic-Semiconductor Coupled Simulation, Yuanzhe Xu, Quan Chen, Lijun Jiang, Ngai Wong

Electrical and Computer Engineering Faculty Research & Creative Works

We develop a new method based on the high-frequency electromagnetic (EM)-semiconductor coupled simulation to analyze the impact of multi-type process variations happen around semi-conductormetal structure. It is competent to simultaneously handle geometrical variations like surface roughness and material variations like semi-conductor doping profile, which are difficult for traditional stand alone simulation methods. A sparse grid based stochastic spectral collocation method (SSCM) combined with principle factor analysis (PFA) is implemented to accelerate the stochastic simulation. Numerical results confirm the validity and significance of our variational coupled simulation framework. © 2011 IEEE.

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Integrate And Fire Circuit As An Adc Replacement, Manu Rastogi, Alexander Singh Alvarado, John G. Harris, José C. Principe Aug 2011

Integrate And Fire Circuit As An Adc Replacement, Manu Rastogi, Alexander Singh Alvarado, John G. Harris, José C. Principe

Electrical and Computer Engineering Faculty Research & Creative Works

We evaluate the performance of an asynchronous analog-to-digital converter known as the Integrate and Fire (I&F) circuit. The reconstruction algorithm for the sampler is presented along with the analytical results for the signal-to-noise ratio (SNR) of the reconstructed signal. We present the power vs. SNR tradeoff, based on the measurements from the chip fabricated in AMI 0.6 m technology. The figure-of-merit (FOM) of the I&F sampler is 0.6 pJ/conversion, which is comparable to the reported FOM for other synchronous and asynchronous ADCs, even though the I&F is implemented in a much older technology as compared to the other ADCs. © …

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Dynamic, Stochastic, Computational, And Scalable Technologies For Smart Grids, Ganesh K. Venayagamoorthy Aug 2011

Dynamic, Stochastic, Computational, And Scalable Technologies For Smart Grids, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

The smart electric power grid will evolve into a very complex adaptive system under semi-autonomous distributed control. its spatial and temporal complexity, non-convexity, non-linearity, non-stationarity, variability and uncertainties exceed the characteristics found in today's traditional power system. the distributed integration of intermittent sources of energy and plug-in electric vehicles to a smart grid further adds complexity and challenges to its modeling, control and optimization. Innovative technologies are needed to handle the growing complexity of the smart grid and stochastic bidirectional optimal power flows, to maximize the penetration of renewable energy, and to provide maximum utilization of available energy storage, especially …

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Online Optimal Control Of Nonlinear Discrete-Time Systems Using Approximate Dynamic Programming, Travis Dierks, Sarangapani Jagannathan Aug 2011

Online Optimal Control Of Nonlinear Discrete-Time Systems Using Approximate Dynamic Programming, Travis Dierks, Sarangapani Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, the optimal control of a class of general affine nonlinear discrete-time (DT) systems is undertaken by solving the Hamilton Jacobi-Bellman (HJB) equation online and forward in time. the proposed approach, referred normally as adaptive or approximate dynamic programming (ADP), uses online approximators (OLAs) to solve the infinite horizon optimal regulation and tracking control problems for affine nonlinear DT systems in the presence of unknown internal dynamics. Both the regulation and tracking controllers are designed using OLAs to obtain the optimal feedback control signal and its associated cost function. Additionally, the tracking controller design entails a feedforward portion …

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Special Issue On Approximate Dynamic Programming And Reinforcement Learning, Silvia Ferrari, Jagannathan Sarangapani, Frank L. Lewis Aug 2011

Special Issue On Approximate Dynamic Programming And Reinforcement Learning, Silvia Ferrari, Jagannathan Sarangapani, Frank L. Lewis

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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Sol-Gel Derived Silver-Incorporated Titania Thin Films On Glass: Bactericidal And Photocatalytic Activity, Betul Akkopru Akgun, Anthony W. Wren, Caner Durucan, Mark R. Towler, Nathan P. Mellott Aug 2011

Sol-Gel Derived Silver-Incorporated Titania Thin Films On Glass: Bactericidal And Photocatalytic Activity, Betul Akkopru Akgun, Anthony W. Wren, Caner Durucan, Mark R. Towler, Nathan P. Mellott

Chemical and Biochemical Engineering Faculty Research & Creative Works

Titanium dioxide (TiO2) and silver-containing TiO2 (Ag-TiO2) thin films were prepared on silica pre-coated float glass substrates by a sol-gel spin coating method. The bactericidal activity of the films was determined against Staphylococcus epidermidis under natural and ultraviolet (UV) illumination by four complementary methods; (1) the disk diffusion assay, (2) UV-induced bactericidal test, (3) qualitative Ag ion release in bacteria inoculated agar media and (4) surface topographical examination by laserscan profilometry. Photocatalytic activity of the films was measured through the degradation of stearic acid under UV, solar and visible light conditions. The chemical state and …

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Clinical Risk Factors For Osteoporosis In Ireland And The Uk: A Comparison Of Frax And Qfracturescores, N. M. Cummins, E. K. Poku, Mark R. Towler, O. M. O'Driscoll, S. H. Ralston Aug 2011

Clinical Risk Factors For Osteoporosis In Ireland And The Uk: A Comparison Of Frax And Qfracturescores, N. M. Cummins, E. K. Poku, Mark R. Towler, O. M. O'Driscoll, S. H. Ralston

Chemical and Biochemical Engineering Faculty Research & Creative Works

Recently two algorithms have become available to estimate the 10-year probability of fracture in patients suspected to have osteoporosis on the basis of clinical risk factors: the FRAX algorithm and QFractureScores algorithm (QFracture). The aim of this study was to compare the performance of these algorithms in a study of fracture patients and controls recruited from six centers in the United Kingdom and Ireland. A total of 246 postmenopausal women aged 50-85 years who had recently suffered a low-trauma fracture were enrolled and their characteristics were compared with 338 female controls who had never suffered a fracture. Femoral bone mineral …

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Lattice Dynamics In The Fesb₃ Skutterudite, Anne Möchel, Ilya Sergueev, Ngoc Thanh Nguyen, Gary J. Long, Fernande Grandjean, D. C. Johnson, Raphäel P. Hermann Aug 2011

Lattice Dynamics In The Fesb₃ Skutterudite, Anne Möchel, Ilya Sergueev, Ngoc Thanh Nguyen, Gary J. Long, Fernande Grandjean, D. C. Johnson, Raphäel P. Hermann

Chemistry Faculty Research & Creative Works

Thin films of FeSb3 were characterized by electronic transport, magnetometry, x-ray diffraction, 57Fe and 121Sb nuclear inelastic scattering, and 57Fe Mössbauer spectroscopy. Resistivity and magnetometry measurements reveal semiconducting behavior with a 16.3(4) meV band gap and an effective paramagnetic moment of 0.57(6) B, respectively. A systematic comparison of the lattice dynamics with CoSb3 and EuFe 4Sb12 reveals that the Fe4Sb12 framework is softer than the Co4Sb12 framework, and that the observed softening and the associated lowering of the lattice thermal conductivity in the RFe4Sb12 filled skutterudites …

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A Large-Scale Synthesis And Characterization Of Quaternary Cuinₓga₁₋ₓs₂ Chalcopyrite Nanoparticles Via Microwave Batch Reactions, Chivin Sun, Richard D. Westover, Gary J. Long, Cyril Bajracharya, Jerry D. Harris, Alexander Punnoose, René G. Rodriguez, Joshua J. Pak Aug 2011

A Large-Scale Synthesis And Characterization Of Quaternary Cuinₓga₁₋ₓs₂ Chalcopyrite Nanoparticles Via Microwave Batch Reactions, Chivin Sun, Richard D. Westover, Gary J. Long, Cyril Bajracharya, Jerry D. Harris, Alexander Punnoose, René G. Rodriguez, Joshua J. Pak

Chemistry Faculty Research & Creative Works

Various quaternary CuInxGa1-xS2 (0≤x≤1) chalcopyrite nanoparticles have been prepared from molecular single-source precursors via microwave decomposition. We were able to control the nanoparticle size, phase, stoichiometry, and solubility. Depending on the choice of surface modifiers used, we were able to tune the solubility of the resulting nanoparticles. This method has been used to generate up to 5g of nanoparticles and up to 150g from multiple batch reactions with excellent reproducibility. Data from UV-Vis, photoluminescence, X-ray diffraction, TEM, DSC/TGA-MS, and ICP-OES analyses have shown high reproducibility in nanoparticle size, composition, and bandgap.

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Numerical Modeling Of Aquaculture Dissolved Waste Transport In A Coastal Embayment, Subhas K. Venayagamoorthy, Hyeyun Ku, Oliver B. Fringer, Alice Chiu, Rosamond L. Naylor, Jeffrey R. Koseff Aug 2011

Numerical Modeling Of Aquaculture Dissolved Waste Transport In A Coastal Embayment, Subhas K. Venayagamoorthy, Hyeyun Ku, Oliver B. Fringer, Alice Chiu, Rosamond L. Naylor, Jeffrey R. Koseff

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Marine aquaculture is expanding rapidly without reliable quantification of effluents. The present study focuses on understanding the transport of dissolved wastes from aquaculture pens in near-coastal environments using the hydrodynamics code SUNTANS (Stanford Unstructured Nonhydrostatic Terrain-following Adaptive Navier-Stokes Simulator), which employs unstructured grids to compute flows in the coastal ocean at very high resolution. Simulations of a pollutant concentration field (in time and space) as a function of the local environment (bathymetry), flow conditions (tides and wind-induced currents), and the location of the pens were performed to study their effects on the evolution of the waste plume. The presence of …

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Mutual Projectile And Target Ionization In 1-Mev/Amu N⁴⁺ And N₅⁺+ He Collisions, Xincheng Wang, Katharina R. Schneider, Aditya H. Kelkar, Gunterschul Brenner, Michael Schulz, B. Najjari, Alexander B. Voitkiv, M. Gundmundsson, Manfred Grieser, Claude Krantz, Michael Lestinsky, Andreas R. Wolf, Siegbert Hagmann, Robert Moshammer, Joachim Hermann Ullrich, Daniel Fischer Aug 2011

Mutual Projectile And Target Ionization In 1-Mev/Amu N⁴⁺ And N₅⁺+ He Collisions, Xincheng Wang, Katharina R. Schneider, Aditya H. Kelkar, Gunterschul Brenner, Michael Schulz, B. Najjari, Alexander B. Voitkiv, M. Gundmundsson, Manfred Grieser, Claude Krantz, Michael Lestinsky, Andreas R. Wolf, Siegbert Hagmann, Robert Moshammer, Joachim Hermann Ullrich, Daniel Fischer

Physics Faculty Research & Creative Works

We have studied mutual projectile and target ionization in 1-MeV/amu N4+ and N5++He collisions in kinematically complete experiments by measuring the momenta of the recoil ion and both ejected electrons in coincidence with the charge-changed projectiles. By means of four-particle Dalitz plots, in which multiple differential cross sections are presented as a function of the momenta of all four particles, experimental spectra are compared with theoretical results from various models. The experimental data are qualitatively reproduced by higher-order calculations, where good agreement is achieved for N5++He collisions, while some discrepancies persist for N4++He …

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Strong-Field Nonsequential Double Ionization Of Ar And Ne, Zhangjin Chen, Yaqiu Liang, Don H. Madison, Chiidong Lin Aug 2011

Strong-Field Nonsequential Double Ionization Of Ar And Ne, Zhangjin Chen, Yaqiu Liang, Don H. Madison, Chiidong Lin

Physics Faculty Research & Creative Works

We investigate the nonsequential double ionization (NSDI) of Ar and Ne based on quantitative rescattering theory (QRS). According to QRS theory, each elementary NSDI process can be calculated by multiplying the returning electron wave packet with appropriate differential electron-ion scattering cross sections. We include (e, 2e) and electron-impact excitation cross sections of Ar+ to obtain the correlated electron momentum spectra for the NSDI of Ar by few-cycle pulses to check the dependence of NSDI on the carrier-envelope phase. The results are compared to the ion momentum spectra from the recent experiment of Johnson [Phys. Rev. APLRAAN1050-294710.1103/ PhysRevA.83.013412 83, 013412 …

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Kinetic Analysis Of The Thermal Degradation Of Printed Wiring Boards, Alex Luyima, Lifeng Zhang, Lucas Nana Wiredu Damoah Aug 2011

Kinetic Analysis Of The Thermal Degradation Of Printed Wiring Boards, Alex Luyima, Lifeng Zhang, Lucas Nana Wiredu Damoah

Materials Science and Engineering Faculty Research & Creative Works

The non-isothermal pyrolysis of printed wiring boards (PWBs) was investigated by simultaneous thermogravimetric and differential thermal analysis (TG-DTA) in the temperature range of 300-1200 K. Pyrolysis experiments were carried out on PWBs samples at three different heating rates of 10, 20, and 30°C/min. in this study, the kinetic parameters of PWBs pyrolysis have been estimated using model free and model fitted methods. © 2011 TMS.

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Arsenic Accumulation In Rice Grains: Effects Of Cultivars And Water Management Practices, Bin Hua, Wengui Yan, Jianmin Wang, Baolin Deng, John Yang Aug 2011

Arsenic Accumulation In Rice Grains: Effects Of Cultivars And Water Management Practices, Bin Hua, Wengui Yan, Jianmin Wang, Baolin Deng, John Yang

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Arsenic (As) accumulation in rice grains is a threat to human health and marketability of rice products. in an effort to minimize as uptake by rice grains, field experiments were conducted to investigate as accumulation in rice grains of three cultivars in monosodium methane arsonate-treated soil under saturated and flooded water management practices. Results indicated that as concentrations in rice grains were cultivar-dependent and influenced by water management. Soil flooding would substantially enhance the as accumulation with a great variation among cultivars. Extractable as in the soil was positively correlated with sodium dithionite-sodium citrate-sodium bicarbonate solution-extractable Fe, suggesting a strong …

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Thermal Expansions In Wurtzite Aln, Gan, And Inn: First-Principle Phonon Calculations, L.-C. Xu, R.-Z. Wang, Xiaodong Yang, H. Yan Aug 2011

Thermal Expansions In Wurtzite Aln, Gan, And Inn: First-Principle Phonon Calculations, L.-C. Xu, R.-Z. Wang, Xiaodong Yang, H. Yan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Using the first-principle phonon calculations under the quasiharmonic approximation, thermal expansions in III-nitrides with wurtzite AlN, GaN, and InN are reported. The results showed that it is different for each thermal expansion of three III-nitrides at low temperatures, which is consistent with their Grneisen parameters as the function of temperature. Below 50 K, negative thermal expansions occur in InN, while GaN and AlN follow the rule of positive thermal expansion. To seek the origin of positivenegative thermal expansion distinction, the mode Grneisen parameters and the phonon spectra are investigated. They indicate that different low-frequency phonon vibration modes correspond to the …

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Phytoforensics, Dendrochemistry, And Phytoscreening: New Green Tools For Delineating Contaminants From Past And Present, Joel Gerard Burken, Don A. Vroblesky, Jean Christophe Balouet Aug 2011

Phytoforensics, Dendrochemistry, And Phytoscreening: New Green Tools For Delineating Contaminants From Past And Present, Joel Gerard Burken, Don A. Vroblesky, Jean Christophe Balouet

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

As Plants Evolved to Be Extremely Proficient in Mass Transfer with their Surroundings and Survive as Earth's Dominant Biomass, They Also Accumulate and Store Some Contaminants from Surroundings, Acting as Passive Samplers. Novel Applications and Analytical Methods Have Been Utilized to Gain Information About a Wide Range of Contaminants in the Biosphere Soil, Water, and Air, with Information Available on Both Past (Dendrochemistry) and Present (Phytoscreening). Collectively These Sampling Approaches Provide Rapid, Cheap, Ecologically Friendly, and overall "Green" Tools Termed "Phytoforensics". © 2011 American Chemical Society.

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Controlled Release Of 6-Aminonicotinamide From Aligned, Electrospun Fibers Alters Astrocyte Metabolism And Dorsal Root Ganglia Neurite Outgrowth, Nicholas J. Schaub, Ryan J. Gilbert Aug 2011

Controlled Release Of 6-Aminonicotinamide From Aligned, Electrospun Fibers Alters Astrocyte Metabolism And Dorsal Root Ganglia Neurite Outgrowth, Nicholas J. Schaub, Ryan J. Gilbert

Chemical and Biochemical Engineering Faculty Research & Creative Works

Following central nervous system (CNS) injury, activated astrocytes form a glial scar that inhibits the migration of axons ultimately leading to regeneration failure. Biomaterials developed for CNS repair can provide local delivery of therapeutics and/or guidance mechanisms to encourage cell migration into damaged regions of the brain or spinal cord. Electro spun fibers are a promising type of biomaterial for CNS injury since these fibers can direct cellular and axonal migration while slowly delivering therapy to the injury site. In this study, it was hypothesized that inclusion of an anti-metabolite, 6-aminonicotinamide (6AN), within poly-l-lactic acid electro spun fibers could attenuate …

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Fall 2011 E-Certi Newsletter, Center For Educational Research And Teaching Innovation Aug 2011

Fall 2011 E-Certi Newsletter, Center For Educational Research And Teaching Innovation

CAFE Faculty Newsletters

Welcome back, S&T faculty, to the fall 2011 semester. Can being a history professor at a technological university really be a dream job? Find out by reading about World War II expert John McManus. Also in this issue: web resources for faculty on the topic of classroom management, what the Curators’ Teaching Professors will be talking about, and how to answer the question, “Did I miss anything in class?”

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Enhanced Mimo Lmmse Turbo Equalization: Algorithm, Simulations, And Undersea Experimental Results, Jun Tao, Jingxian Wu, Yahong Rosa Zheng, Chengshan Xiao Aug 2011

Enhanced Mimo Lmmse Turbo Equalization: Algorithm, Simulations, And Undersea Experimental Results, Jun Tao, Jingxian Wu, Yahong Rosa Zheng, Chengshan Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, an enhanced linear minimum mean square error (LMMSE) turbo equalization scheme is proposed for multiple-input multiple-output (MIMO) communication systems with bit-interleaved coded modulation (BICM) in the time domain and multiplexing in the space domain. the proposed turbo equalization scheme outperforms the conventional LMMSE turbo equalization by adopting two new signal processing techniques. First, it performs hybrid soft interference cancellation (HSOIC) by subtracting the soft decisions of the interfering symbols, and the soft decisions are calculated by using a hybrid of the a priori information at the equalizer input and the a posteriori information at the equalizer output. …

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Development Of A 3-Body:Many-Body Integrated Fragmentation Method For Weakly Bound Clusters And Application To Water Clusters (H2o) N=3-10, 16, 17, Desiree M. Bates, Joshua R. Smith, Tomasz Janowski, Gregory S. Tschumper Jul 2011

Development Of A 3-Body:Many-Body Integrated Fragmentation Method For Weakly Bound Clusters And Application To Water Clusters (H2o) N=3-10, 16, 17, Desiree M. Bates, Joshua R. Smith, Tomasz Janowski, Gregory S. Tschumper

Chemistry Faculty Research & Creative Works

A 3-body:many-body integrated quantum mechanical (QM) fragmentation method for non-covalent clusters is introduced within the ONIOM formalism. The technique captures all 1-, 2-, and 3-body interactions with a high-level electronic structure method, while a less demanding low-level method is employed to recover 4-body and higher-order interactions. When systematically applied to 40 low-lying (H2O)n isomers ranging in size from n = 3 to 10, the CCSD(T):MP2 3-body:many-body fragmentation scheme deviates from the full CCSD(T) interaction energy by no more than 0.07 kcal mol-1 (or < 0.01 kcal mol-1 per water). The errors for this QM:QM method increase only slightly for various low-lying isomers of (H2O)16 and (H2O)17 (always within 0.13 kcal mol-1 …

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A Parallel Robin-Robin Domain Decomposition Method For The Stokes-Darcy System, Wenbin Chen, Max Gunzburger, Fei Hua, Xiaoming Wang Jul 2011

A Parallel Robin-Robin Domain Decomposition Method For The Stokes-Darcy System, Wenbin Chen, Max Gunzburger, Fei Hua, Xiaoming Wang

Mathematics and Statistics Faculty Research & Creative Works

We propose a new parallel Robin-Robin domain decomposition method for the coupled Stokes-Darcy system with Beavers-Joseph-Saffman-Jones interface boundary condition. in particular, we prove that, with an appropriate choice of parameters, the scheme converges geometrically independent of the mesh size. © 2011 Society for Industrial and Applied Mathematics.

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Implementation And Testing Of Rans Turbulence Models For Stably Stratified Flows, Zachary A. Elliott, S. K. Venayagamoorthy Jul 2011

Implementation And Testing Of Rans Turbulence Models For Stably Stratified Flows, Zachary A. Elliott, S. K. Venayagamoorthy

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The presence of buoyancy forces due to stratification has a substantial effect on the flow development and mixing processes and hence influences the distribution of pollutants and suspended matter in environmental flows such as in reservoirs, lakes, and estuaries. In this study, we focus on the implementation and testing of proposed changes that explicitly account for buoyancy effects in Reynolds-averaged Navier-Stokes (RANS) turbulence models. Direct numerical simulation (DNS) data of stably stratified homogeneous turbulence are used to study the parameters in two-equation RANS turbulence models such as the buoyancy parameter Cε3, and the turbulent Prandtl number Prt in the k-ε …

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Hydraulics And Mixing Efficiency Of Small Public Water Disinfection Systems, J. M. Wilson, S. K. Venayagamoorthy Jul 2011

Hydraulics And Mixing Efficiency Of Small Public Water Disinfection Systems, J. M. Wilson, S. K. Venayagamoorthy

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The research presented in this study focuses on the evaluation of flow and scalar transport characteristics of small disinfection systems, primarily through computational fluid dynamics (CFD) and physical conservative tracer studies overcoming the traditional "black box" approach of disinfection tank design based on theoretical detention time (TDT). Original research was performed on a series of pressurized tanks systems and on two differing open surface tank systems. CFD allowed for evaluation of the systems' respective flow characteristics which govern the transport of any quantity. Residence time distribution (RTD), or flow-through, curves measuring the effluent concentration of a passive scalar or conservative …

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Buckling Of Profiled Steel Diaphragms, Rao V. Nunna Jul 2011

Buckling Of Profiled Steel Diaphragms, Rao V. Nunna

CCFSS Library (1939 - present)

No abstract provided.

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Attenuation In Extended Structures Coated With Thin Magneto-Dielectric Absorber Layer, Marina Koledintseva, Alexander G. Razmadze, Aleksandr Yakubovich Gafarov, Victor Khilkevich, James L. Drewniak, Takanori Tsutaoka Jul 2011

Attenuation In Extended Structures Coated With Thin Magneto-Dielectric Absorber Layer, Marina Koledintseva, Alexander G. Razmadze, Aleksandr Yakubovich Gafarov, Victor Khilkevich, James L. Drewniak, Takanori Tsutaoka

Electrical and Computer Engineering Faculty Research & Creative Works

Thin absorbing layers containing magnetic alloy or ferrite inclusions can be effectively used for attenuating common-mode currents on extended structures, such as power cords, cables, or edge-coupled microstrip lines. An analytical model to evaluate attenuation on the coaxial line with the central conductor coated with a magneto-dielectric layer is proposed and validated by the experiments and numerical modeling. The analytical model is validated using available magneto-dielectric samples of different thicknesses. This model can serve for comparing and predicting the absorptive properties of different samples of magneto-dielectric materials, whose compositions may be unknown, but dielectric and magnetic properties can be determined …

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