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Articles 1 - 30 of 100
Full-Text Articles in Engineering
Effect Of Thin Film Confined Between Two Dissimilar Solids On Interfacial Thermal Resistance, Zhi Liang, Hai-Lung Tsai
Effect Of Thin Film Confined Between Two Dissimilar Solids On Interfacial Thermal Resistance, Zhi Liang, Hai-Lung Tsai
Mechanical and Aerospace Engineering Faculty Research & Creative Works
A Non-Equilibrium Molecular Dynamics Model is Developed to Investigate How a Thin Film Confined between Two Dissimilar Solids Affects the Thermal Transport Across the Material Interface. for Two Highly Dissimilar (Phonon Frequency Mismatched) Solids, It is Found that the Insertion of a Thin Film between Them Can Greatly Enhance Thermal Transport Across the Material Interface by a Factor of 2.3 If the Thin Film Has One of the Following Characteristics: (1)a Multi-Atom-Thick Thin Film of Which the Phonon Density of States (DOS) Bridges the Two Different Phonon DOSs for the Solid on Each Side of the Thin Film; (2)a Single-Atom-Thick …
Regeneration Of Carbon Aerogel Exhausted In Water Purification, Sanjay Tewari
Regeneration Of Carbon Aerogel Exhausted In Water Purification, Sanjay Tewari
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Carbon has been used electrochemically in various forms for water treatment and the carbon aerogel is one of them. Carbon Aerogels (CA) are used as electrodes due to their high surface capacity and high electrical conductivity. They are also known as Carbon Nanofoams (CNF). CA electrodes attract oppositely charged ions that are nearby. This concept is known as Capacitive De-Ionization (CDI). The use of CA in CDI for water purification is well documented, but not much work has been done on regeneration of CA electrodes. Once saturated, these electrodes lose their ability to adsorb additional ions and it must be …
Simulations Of Pulse Signals With X-Parameters, Nick K.H. Huang, Lijun Jiang
Simulations Of Pulse Signals With X-Parameters, Nick K.H. Huang, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Nonlinearity is becoming increasingly important to IC technologies. From the PHD formalism, X-parameter models provide an accurate frequency-domain method under large-signal operating points to characterize their nonlinear behaviors. In this work, X-parameter models are investigated to handle time-domain pulse signals which is critical to IC signal integrity but was not studied before. Two representative circuits, an analog LNA and a digital CMOS buffer, were employed to characterize the X-parameter performance. The results obtained in this paper provide the first hand data for pulse signal responses of X-parameters in signal integrity modelings. © 2011 IEEE.
The Role Of Eddies Inside Pores In The Transition From Darcy To Forchheimer Flows, Kuldeep Chaudhary, M. Bayani Cardenas, Wen Deng, Philip C. Bennett
The Role Of Eddies Inside Pores In The Transition From Darcy To Forchheimer Flows, Kuldeep Chaudhary, M. Bayani Cardenas, Wen Deng, Philip C. Bennett
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
We studied the role of intra-pore eddies, from viscous to inertial flows, in modifying continuum-scale flow inside pores. Flow regimes spanning Reynolds Number Re ∼ 0 to 1350 are divided into three zones - one zone follows Darcy flow, and the other two zones describe non-Darcy or Forchheimer flow. During viscous flows, i.e., Re < 1, stationary eddies occupy about 1/5 of the pore volume. Eddies grow when Re > 1, and their growth leads to the deviation from Darcy's law and the emergence of Forchheimer flow manifested as a characteristic reduction in the apparent hydraulic conductivity Ka. The reduction in Ka is due to the narrowing of the flow channel which is …
Work In Progress - Exercises In Squeak Smalltalk For Pre-College Education, Steve Eugene Watkins, Nicolette Kowalewski, Kathryn N. Rodhouse, Benjamin Cooper
Work In Progress - Exercises In Squeak Smalltalk For Pre-College Education, Steve Eugene Watkins, Nicolette Kowalewski, Kathryn N. Rodhouse, Benjamin Cooper
Electrical and Computer Engineering Faculty Research & Creative Works
Computer programming education helps to prepare pre-college students to function in a technology-based society and to promote technical careers. However, opportunities are limited for pre-college students to learn computer programming and effective programming instruction can be difficult. A set of introductory, self-paced tutorials in Squeak Smalltalk has been developed for students in high school and middle school. This work describes two supplementary exercises that address the needs of new learners, especially those at younger ages. Students are given tools for drawing and image manipulation. The optional exercises integrate basic concepts while allowing more interactivity and customization through creative "play." © …
Compact Metallic Rfid Tag Antennas With A Loop-Fed Method, Peng H. Yang, Yan Li, Lijun Jiang, W. C. Chew, Terry Tao Ye
Compact Metallic Rfid Tag Antennas With A Loop-Fed Method, Peng H. Yang, Yan Li, Lijun Jiang, W. C. Chew, Terry Tao Ye
Electrical and Computer Engineering Faculty Research & Creative Works
Several compact, low profile and metal-attachable RFID tag antennas with a loop-fed method are proposed for UHF RFID systems. The structure of the proposed antennas comprise of two parts: (1) The radiator part consists of two shorted patches, which can be treated as two quarter-wave patch antennas or a cavity. (2) A small loop printed on the paper serves as the feeding structure. The small loop provides the needed inductance for the tag and is connected to the RFID chip. The input impedance of the antenna can be easily adjusted by changing loop dimensions. The antenna has the compact size …
Mixed Integral-Differential Skin-Effect Models For Peec Electromagnetic Solver, Giulio Antonini, Albert E. Ruehli, Lijun Jiang
Mixed Integral-Differential Skin-Effect Models For Peec Electromagnetic Solver, Giulio Antonini, Albert E. Ruehli, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Efficient modeling of the broadband skin-effect for conducting 3D shapes is a challenging issue for the solution of large electromagnetic problems. The inclusion of such models in an EM solver can be very costly in compute time and memory requirements. Several properties of a model are desirable for the solution of practical problems such as the broadband frequency domain or the time domain applicability. In this paper, we present a model which meets some of these challenges and which is suitable for the PEEC solution method. © 2011 IEEE.
Evaluation Of Pre-Consolidation Stress Determination Methods, Omar Conte, Stephanie Rust, Louis Ge, Richard Wesley Stephenson
Evaluation Of Pre-Consolidation Stress Determination Methods, Omar Conte, Stephanie Rust, Louis Ge, Richard Wesley Stephenson
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Pre-Consolidation Pressure Provides Valuable Information About Soil Behavior And, Specifically, Settlement under an Induced Load. Soil is Expected to Have Less Settlement Before its Pre-Consolidation Pressure and Much More Settlement after that Point. the Pre-Consolidation Pressure and the Compressibility of the Soil Can Be Determined from the Results of a One-Dimensional Consolidation Test. Different Methods Have Been Developed to Obtain the Accurate Pre-Consolidation Pressure from One Dimensional Consolidation Test Data. This Paper Presents and Discusses the Results of the One-Dimensional Consolidation Test Data from an Extensive Testing Program. the Test Specimens Used Were Obtained from Multiple Borehole Locations and Were …
Work In Progress - Virtual Facilitation And Procedural Knowledge Education, Ray Luechtefeld, Steve Eugene Watkins
Work In Progress - Virtual Facilitation And Procedural Knowledge Education, Ray Luechtefeld, Steve Eugene Watkins
Electrical and Computer Engineering Faculty Research & Creative Works
Engineering students acquire both conceptual and procedural knowledge as part of their education. While conceptual knowledge, such as understanding why certain design practices are required or having knowledge of the general principles of engineering development, is essential, procedural knowledge to enact specific engineering practices is also needed. This kind of knowledge, such as balancing chemical equations, solving calculus problems, or finding Thevenin-Norton equivalents, is usually taught through rote problem solving, sometimes with the guidance of teaching assistants or aid from the instructor if students find themselves "stuck". However, a Virtual Facilitator, designed to help students develop team skills, can also …
Solid Oxide Fuel Cell Process And Apparatus, Mathew Ellis Cooper, David J. Bayless, Jason P. Trembly
Solid Oxide Fuel Cell Process And Apparatus, Mathew Ellis Cooper, David J. Bayless, Jason P. Trembly
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Conveying gas containing sulfur through a sulfur tolerant planar solid oxide fuel cell (PSOFC) stack for sulfur scrubbing, followed by conveying the gas through a non-sulfur tolerant PSOFC stack. The sulfur tolerant PSOFC stack utilizes anode materials, such as LSV, that selectively convert H2S present in the fuel stream to other non-poisoning sulfur compounds. The remaining balance of gases remaining in the completely or near H2S-free exhaust fuel stream is then used as the fuel for the conventional PSOFC stack that is downstream of the sulfur-tolerant PSOFC. A broad range of fuels such as gasified coal, …
Code Of Standard Practice For Cold-Formed Steel Structural Framing, 2011 Edition, American Iron And Steel Institute
Code Of Standard Practice For Cold-Formed Steel Structural Framing, 2011 Edition, American Iron And Steel Institute
American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)
No abstract provided.
A Low Frequency Stable Epa Method Accelerated By The Adaptive Cross Approximation Algorithm, Zu Hui Ma, Lijun Jiang, Zhi Guo Qian, Lijun Jiang
A Low Frequency Stable Epa Method Accelerated By The Adaptive Cross Approximation Algorithm, Zu Hui Ma, Lijun Jiang, Zhi Guo Qian, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Low frequency full wave electromagnetic modeling is of great importance to a number of applications. But it is also a great challenge in the research of computational electromagnetics (CEM). To address this issue, in this paper, we will discuss incorporating the augmented electric field integral equation (A-EFIE) into the low frequency augmented equivalence principle algorithm (A-EPA) method. It effectively improves the low frequency simulation stability. But this method involves the calculation of the translation process which is exceptionally time-consuming and memory-consuming. In order to surmount this problem, we use the adaptive cross approximation (ACA) to accelerate the calculation of this …
Modeling Electrically Small Structures In Layered Medium With Augmented Efie Method, Yongpin P. Chen, Lijun Jiang, Zhi Guo Qian, Weng Cho Chew
Modeling Electrically Small Structures In Layered Medium With Augmented Efie Method, Yongpin P. Chen, Lijun Jiang, Zhi Guo Qian, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
Electrically small structures embedded in a planarly layered medium are modeled by the augmented electric field integral equation (EFIE) method in this paper. By separating charge as extra unknown list, and enforcing the current continuity equation, an augmented EFIE (A-EFIE) can be setup. The matrix-friendly formulation of layered medium Green's function is applied and the frequency scaling of the impedance matrix in the moment method is analyzed when the frequency tends to zero. Rank deficiency and the charge neutrality enforcement is also discussed in detail. Numerical results show that the low frequency breakdown of electrically small structures embedded in a …
Finite-Width Gap Excitation And Impedance Models, Yat Hei Lo, Shiquan He, Lijun Jiang, Weng Cho Chew
Finite-Width Gap Excitation And Impedance Models, Yat Hei Lo, Shiquan He, Lijun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we present a new method for the feed model for the method of moments (MoM). It is derived from a more accurate model with the realistic size of the excitation, in order to replace the commonly-used delta-gap excitation model. This new model is formulated around the electric field integration equations (EFIE) where the terms for magnetic current and magnetic field can be removed. Hence it is much simpler to implement and reduces the numerical complexity. In addition, a variational formulation is derived to provide second order accuracy of the input admittance calculation. Moreover, this new formulation can …
A New Closed-Form Evaluation Of Layered Medium Green's Function, Yongpin P. Chen, Weng Cho Chew, Lijun Jiang
A New Closed-Form Evaluation Of Layered Medium Green's Function, Yongpin P. Chen, Weng Cho Chew, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
A new closed-form evaluation of layered medium Green's function is proposed in this paper. The discrete complex image method (DCIM) is extended to sampling along the Sommerfeld branch cut, to capture the far field interaction. Contour deformation technique is applied to decompose the Green's function into radiation modes (branch cut integration) and guided modes (surface-wave poles). The matrix pencil method is implemented to get a closed-form solution, with the help of an alternative Sommerfeld identity. Numerical results are presented to demonstrate the accuracy of this method. © 2011 IEEE.
Reflection And Transmission Of Line-Source Excited Pulsed Em Fields At A Thin, High-Contrast Layer With Dielectric And Conductive Properties, Adrianus T. De Hoop, Lijun Jiang
Reflection And Transmission Of Line-Source Excited Pulsed Em Fields At A Thin, High-Contrast Layer With Dielectric And Conductive Properties, Adrianus T. De Hoop, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
A methodology is presented for analytically modeling the reflection and transmission of line-source excited pulsed electromagnetic fields fields at a thin, planar, high-contrast layer with dielectric and conductive properties. Closed-form time-domain expressions are derived for the field components in a two-dimensional setting via an extension of the Cagniard-DeHoop method. © 2011 IEEE.
Comparison Of Microwave And Conventionally Sintered Yttria-Doped Zirconia Ceramics, Colin J. Reidy, Thomas J. Fleming, Stuart Hampshire, Mark R. Towler
Comparison Of Microwave And Conventionally Sintered Yttria-Doped Zirconia Ceramics, Colin J. Reidy, Thomas J. Fleming, Stuart Hampshire, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
This paper reports on improvement of the physical and mechanical properties of Y2O3-ZrO2 ceramics through compositional optimization, the use of nanograined powders and utilization of microwave sintering. ZrO2 with 2-5 mol% Y2O3, prepared from nanopowders, was sintered in both conventional and microwave furnaces under exactly the same heating schedule. It was found that microwave sintering improves physical and mechanical properties of Y2O3-ZrO2 ceramics compared with conventional sintering. Compositions containing 2 mol% Y2O3 exhibit the greatest improvement due to retention of tetragonal ZrO …
Finite Element Based Generalized Impedance Boundary Condition For Complicated Em Calculation, Shiquan He, Zaiping Nie, Jun Zh Huang, Lijun Jiang, Weng Cho Chew
Finite Element Based Generalized Impedance Boundary Condition For Complicated Em Calculation, Shiquan He, Zaiping Nie, Jun Zh Huang, Lijun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a finite element based generalized impedance boundary condition (FEM-GIBC) is proposed to solve complicated electromagnetic (EM) problems. Complex structures with arbitrary inhomogeneity and shapes are modeled with the finite element method, and their scattering contributions are transformed to generalized impedance conditions on their boundaries. For each sub-domain, a special GIBC can be established and it is only related to the structures in this domain. Hence, for finite periodic structures, a representative GIBC can be formulated at the boundary of a unit cell. After the GIBC at each boundary is established, the electromagnetic coupling between each impedance boundary …
Full-Wave Emc Simulations Using Maxwell Garnett Model For Composites With Cylindrical Inclusions, M. H. Nisanci, F. De Paulis, Marina Koledintseva, A. Orlandi
Full-Wave Emc Simulations Using Maxwell Garnett Model For Composites With Cylindrical Inclusions, M. H. Nisanci, F. De Paulis, Marina Koledintseva, A. Orlandi
Electrical and Computer Engineering Faculty Research & Creative Works
Four different models for effective dielectric properties of biphasic composite containing random or aligned cylindrical inclusions are considered in this paper. These models are based on the Maxwell Garnett (MG) mixing rule. The effects of distribution and orientation of cylindrical inclusions in a composite material is studied. An equivalent averaged material with Debye-like frequency characteristics, suitable for time-domain full-wave numerical electromagnetic simulations is retrieved. This Debye model is derived from the Maxwell Garnett formulation. The numerical model test structure consists of a composite slab inserted in a rectangular waveguide. Simulations are run for the frequency range above the cut-off frequency …
A Novel Characterization Method Of The Radiation Emission For Electromagnetic Compatibility, Ping Li, Lijun Jiang
A Novel Characterization Method Of The Radiation Emission For Electromagnetic Compatibility, Ping Li, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Conventionally the radiation emissions from PCB boards, electronic devices and antennas were characterized through the near field (NF)-far field (FF) transformation to find the equivalent sources. In this paper, a new methodology without NF-FF transformation is presented. Based on the uniqueness theorem, it only employs the measured tangential field over a spherical surface to rigorously characterize the outward radiation emission. The dyadic Green's function for the perfect magnetic conductor (PMC) sphere is derived using spherical wave functions. Based on this dyadic Green's function and integral equations, the NF-FF transformation is not necessary any more. To facilitate feasible near field measurements, …
High Frequency Permeability Of Fe-Al-Si Granular Composite Materials, Takanori Tsutaoka, Taisuke Ono, Aiko Tsurunaga, Teruhiro Kasagi, Kenichi Hatakeyama, Marina Koledintseva
High Frequency Permeability Of Fe-Al-Si Granular Composite Materials, Takanori Tsutaoka, Taisuke Ono, Aiko Tsurunaga, Teruhiro Kasagi, Kenichi Hatakeyama, Marina Koledintseva
Electrical and Computer Engineering Faculty Research & Creative Works
High-frequency electromagnetic properties of Fe-Al-Si alloy (Sendust) granular composite materials have been studied by measuring their relative complex permeability (μr = μr’ – jμr”) and permittivity (εr = εr’ – j εr”) spectra. The bulk Fe-Al-Si alloy shows metallic electrical conduction, and permeability decreases rapidly with frequency. On the other hand, Sendust powder shows relatively high electrical resistivity. Sendust composite material demonstrates insulating electrical properties up to at least 80 vol.% particle content. Thus the relatively high permeability in the microwave frequency range can be obtained. Frequency dispersion characteristics of …
Direct Numerical Simulation Of Hypersonic Turbulent Boundary Layers. Part 4. Effect Of High Enthalpy, L. (Lian) Duan, M. P. Martín
Direct Numerical Simulation Of Hypersonic Turbulent Boundary Layers. Part 4. Effect Of High Enthalpy, L. (Lian) Duan, M. P. Martín
Mechanical and Aerospace Engineering Faculty Research & Creative Works
In this paper we present direct numerical simulations (DNS) of hypersonic turbulent boundary layers to study high-enthalpy effects. We study high-and low-enthalpy conditions, which are representative of those in hypersonic flight and ground-based facilities, respectively. We find that high-enthalpy boundary layers closely resemble those at low enthalpy. Many of the scaling relations for low-enthalpy flows, such as van-Driest transformation for the mean velocity, Morkovin's scaling, and the modified strong Reynolds analogy hold or can be generalized for high-enthalpy flows by removing the calorically perfect-gas assumption. We propose a generalized form of the modified Crocco relation, which relates the mean temperature …
Phytoscreening For Chlorinated Solvents Using Rapid In Vitro Spme Sampling: Application To Urban Plume In Verl, Germany, Matt A. Limmer, Jean Christophe Balouet, Frank Karg, Don A. Vroblesky, Joel Gerard Burken
Phytoscreening For Chlorinated Solvents Using Rapid In Vitro Spme Sampling: Application To Urban Plume In Verl, Germany, Matt A. Limmer, Jean Christophe Balouet, Frank Karg, Don A. Vroblesky, Joel Gerard Burken
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Rapid Detection and Delineation of Contaminants in Urban Settings is Critically Important in Protecting Human Health. Cores from Trees Growing above a Plume of Contaminated Groundwater in Verl, Germany, Were Collected in 1 Day, with Subsequent Analysis and Plume Mapping Completed over Several Days. Solid-Phase Microextraction (SPME) Analysis Was Applied to Detect Tetrachloroethene (PCE) and Trichloroethene (TCE) to Below Nanogram/liter Levels in the Transpiration Stream of the Trees. the Tree Core Concentrations Showed a Clear Areal Correlation to the Distribution of PCE and TCE in the Groundwater. Concentrations in Tree Cores Were Lower Than the Underlying Groundwater, as Anticipated; However, …
Post-Earthquake Reconnaissance Report On Transportation Infrastructure Impact Of The February 27, 2010, Offshore Maule Earthquake In Chile, Wen-Huei Phillip Yen, Genda Chen, Ian G. Buckle, Tony M. Allen, Daniel E. Alzamora, Jeffrey Ger, Juan G. Arias
Post-Earthquake Reconnaissance Report On Transportation Infrastructure Impact Of The February 27, 2010, Offshore Maule Earthquake In Chile, Wen-Huei Phillip Yen, Genda Chen, Ian G. Buckle, Tony M. Allen, Daniel E. Alzamora, Jeffrey Ger, Juan G. Arias
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This report documents the findings and lessons learned from the February 27, 2010, M8.8 offshore Maule earthquake in Chile. Fewer than 0.15 percent of the bridges in Chile's inventory, most built after 1995, collapsed or suffered damage that rendered them useless. Many spans of precast prestressed discontinuous girder bridges with continuous decks fell off their supports, probably due to significant in-plane rotation of the superstructure as a result of severe shaking. Lateral steel stoppers used to provide both vertical and lateral restraints on girders were largely unsuccessful due to their inadequate connection detail to cap beams and abutments. Reinforced concrete …
Monitoring The Early-Age Hydration Of Self-Compacting Concrete Using Ultrasonic P-Wave Transmission And Isothermal Calorimetry, Bram Desmet, Kelly Chrysanthe Atitung, Miguel Angel Abril Sanchez, John Vantomme, Dimitri Feys, Nicolas Robeyst, Katrien Audenaert, Geert De Schutter, Veerle Boel, Gert Heirman, Özlem Cizer, Lucie Vandewalle, Dionys Van Gemert
Monitoring The Early-Age Hydration Of Self-Compacting Concrete Using Ultrasonic P-Wave Transmission And Isothermal Calorimetry, Bram Desmet, Kelly Chrysanthe Atitung, Miguel Angel Abril Sanchez, John Vantomme, Dimitri Feys, Nicolas Robeyst, Katrien Audenaert, Geert De Schutter, Veerle Boel, Gert Heirman, Özlem Cizer, Lucie Vandewalle, Dionys Van Gemert
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The Early-Age Hydration (B48 H) of a Series of Self-Compacting Concretes and Corresponding Mortars and One Traditionally Vibrated Concrete and Mortar is Monitored in a Continuous Way using Ultrasonic Testing and Isothermal Calorimetry. the Mixtures Differ in Type of Mineral Addition, Superplasticizer, Cement, Cement-To-Powder Ratio and Water-To-Powder Ratio. the Influence of These Different Mixture Compositions on the Kinetics of the Hydration during the First Days of the Hydration is Characterized by the Heat Production Rate Q and the Evolution of the P-Wave Velocity, which is a Consequence of the Microstructural Changes. the Variations in the Acceleration Caused by Mineral Additions …
China Earthquake Reconnaissance Report: Performance Of Transportation Structures During The May 12, 2008, M7.9 Wenchuan Earthquake, Wen-Huei Phillip Yen, Genda Chen, Mark Yashinski, Youssef M.A. Hashash, Curtis J. Holub, Kehai Wang, Xiaodong Guo
China Earthquake Reconnaissance Report: Performance Of Transportation Structures During The May 12, 2008, M7.9 Wenchuan Earthquake, Wen-Huei Phillip Yen, Genda Chen, Mark Yashinski, Youssef M.A. Hashash, Curtis J. Holub, Kehai Wang, Xiaodong Guo
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This report documents the lessons learned from damage caused in the May 12, 2008, M7.9 earthquake in Wenchuan County, China. The damage to the 14 observed bridges reminded the researchers of damage suffered during the 1971 San Fernando Earthquake in California. The bridges had few seismic details such as long seats, large shear keys, or tightly spaced transverse reinforcement. Most arch and girder bridges collapsed due to surface rupturing of the seismic faults in the Longmen-Shan thrust zone. A significant portion of roadways and bridges were pushed away or buried by landslides in the steep slopes of mountainous terrain. Damage …
Effective Approach For Estimating Turbulence-Chemistry Interaction In Hypersonic Turbulent Boundary Layers, L. (Lian) Duan, M. P. Martín
Effective Approach For Estimating Turbulence-Chemistry Interaction In Hypersonic Turbulent Boundary Layers, L. (Lian) Duan, M. P. Martín
Mechanical and Aerospace Engineering Faculty Research & Creative Works
An effective approach for estimating turbulence-chemistry interaction in hypersonic turbulent boundary layers is proposed, based on "laminar- chemistry" Reynolds-averaged Navier-Stokes mean flow solutions. The approach combines an assumed probability density function with a temperature fluctuation scaling, which provides the second moment for specifying the shape of the probability density function. As a result, the effects of temperature fluctuation on chemical production rates can be estimated without solving an additional moment evolution equation. The validity of this method is demonstrated using direct-numerical-simulation data. This approach can be used to identify regions with potentially significant turbulence-chemistry interaction in hypersonic boundary layers and …
Effect Of The Thickness Of Undoped Gan Interlayers Between Multiple Quantum Wells And The P-Doped Layer On The Performance Of Gan Light-Emitting Diodes, T. Lu, S. Li, K. Zhang, C. Liu, Y. Yin, L. Wu, H. Wang, Xiaodong Yang, G. Xiao, Y. Zhou
Effect Of The Thickness Of Undoped Gan Interlayers Between Multiple Quantum Wells And The P-Doped Layer On The Performance Of Gan Light-Emitting Diodes, T. Lu, S. Li, K. Zhang, C. Liu, Y. Yin, L. Wu, H. Wang, Xiaodong Yang, G. Xiao, Y. Zhou
Mechanical and Aerospace Engineering Faculty Research & Creative Works
InGaN based light-emitting diodes (LEDs) with undoped GaN interlayer of variant thicknesses grown by metal-organic chemical vapor deposition technique have been investigated. It was found that the thickness of undoped GaN interlayers affected LEDs' performance greatly. The LED with 50 nm undoped GaN interlayer showed higher light output power and lower reverse-leakage current compared with the others at 20 mA. Based on electrical and optical characteristics analysis and numerical simulation, these improvements are mainly attributed to the improvement of the quality of depletion region by inserting an undoped GaN layer, as well as reduction of the Shockley-Read-Hall recombination in InGaN/GaN …
Electron Transport Through Two Irreducibly-Coupled Aharonov-Bohm Rings With Applications To Nanostructure Quantum Computing Circuits, C. A. Cain, Cheng-Hsiao Wu
Electron Transport Through Two Irreducibly-Coupled Aharonov-Bohm Rings With Applications To Nanostructure Quantum Computing Circuits, C. A. Cain, Cheng-Hsiao Wu
Electrical and Computer Engineering Faculty Research & Creative Works
We investigated several classes of two coupled Aharonov-Bohm rings that share a finite center common path, where the phase of the electron wave function can be modulated by two distinct magnetic fluxes. The coupling is similar to two coupled atoms. The behavior of charge accumulation along the center common path or, equivalently, the bonding and anti-bonding of the two rings can be achieved as the two applied fluxes are varied. Thus, when three external terminals are connected to such coupled rings, the behavior of the electron transport is divided into several classes, depending on the number of atoms in each …
Coaxial Cable Bragg Grating, Tao Wei, Songping Wu, Jie Huang, Hai Xiao, Jun Fan
Coaxial Cable Bragg Grating, Tao Wei, Songping Wu, Jie Huang, Hai Xiao, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
This paper reports a coaxial cable Bragg grating (CCBG) fabricated by drilling holes into the cable at periodic distances along the axial direction. Resonances were observed at discrete frequencies in both transmission and reflection spectra. The analogy of the CCBG with a fiber Bragg grating is shown. The grating was tested for the potential application as a strain-sensing device.