Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Missouri University of Science and Technology

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 8701 - 8730 of 33645

Full-Text Articles in Entire DC Network

On Selective Activation In Dense Femtocell Networks, Michael Lin, Simone Silvestri, Novella Bartolini, Thomas F. La Porta Oct 2016

On Selective Activation In Dense Femtocell Networks, Michael Lin, Simone Silvestri, Novella Bartolini, Thomas F. La Porta

Computer Science Faculty Research & Creative Works

Over-provisioned femtocell networks can be used to serve indoor locations that see high peak loads, such as airports or train stations. However, networks designed for high peak loads are mostly under-utilized, which is wasteful from an energy-use perspective. This paper introduces a femtocell selective activation problem. We motivate the use of selective activation in femtocell networks using real femtocell power measurements. We formally define the selective activation problem, and introduce GreenFemto, a distributed femtocell selective activation algorithm. We prove that GreenFemto converges to a locally Pareto optimal solution. Detailed simulations of an LTE wireless system are used to demonstrate the …

Go to article

A Dual-Porosity-Stokes Model And Finite Element Method For Coupling Dual-Porosity Flow And Free Flow, Jiangyong Hou, Meilan Qiu, Xiaoming He, Chaohua Guo, Mingzhen Wei, Baojun Bai Oct 2016

A Dual-Porosity-Stokes Model And Finite Element Method For Coupling Dual-Porosity Flow And Free Flow, Jiangyong Hou, Meilan Qiu, Xiaoming He, Chaohua Guo, Mingzhen Wei, Baojun Bai

Mathematics and Statistics Faculty Research & Creative Works

In this paper, we propose and numerically solve a new model considering confined flow in dual-porosity media coupled with free flow in embedded macrofractures and conduits. Such situation arises, for example, for fluid flows in hydraulic fractured tight/shale oil/gas reservoirs. The flow in dual-porosity media, which consists of both matrix and microfractures, is described by a dual-porosity model. And the flow in the macrofractures and conduits is governed by the Stokes equation. Then the two models are coupled through four physically valid interface conditions on the interface between dual-porosity media and macrofractures/conduits, which play a key role in a physically …

Go to article

Computational Fluid Dynamics Study Of Molten Steel Flow Patterns And Particle-Wall Interactions Inside A Slide-Gate Nozzle By A Hybrid Turbulent Model, Mahdi Mohammadi-Ghaleni, Mohsen Asle Zaeem, Jeffrey D. Smith, Ronald J. O'Malley Oct 2016

Computational Fluid Dynamics Study Of Molten Steel Flow Patterns And Particle-Wall Interactions Inside A Slide-Gate Nozzle By A Hybrid Turbulent Model, Mahdi Mohammadi-Ghaleni, Mohsen Asle Zaeem, Jeffrey D. Smith, Ronald J. O'Malley

Materials Science and Engineering Faculty Research & Creative Works

Melt flow patterns and turbulence inside a slide-gate throttled submerged entry nozzle (SEN) were studied using Detached–Eddy Simulation (DES) model, which is a combination of Reynolds–Averaged Navier–Stokes (RANS) and Large–Eddy Simulation (LES) models. The DES switching criterion between RANS and LES was investigated to closely reproduce the flow structures of low and high turbulence regions similar to RANS and LES simulations, respectively. The melt flow patterns inside the nozzle were determined by k–ε (a RANS model), LES, and DES turbulent models, and convergence studies were performed to ensure reliability of the results. Results showed that the DES model has significant …

Go to article

Data Analytics For Fault Localization In Complex Networks, Maggie X. Cheng, Wei Biao Wu Oct 2016

Data Analytics For Fault Localization In Complex Networks, Maggie X. Cheng, Wei Biao Wu

Computer Science Faculty Research & Creative Works

We consider the problem of identifying the source of failure in a network after receiving alarms or having observed symptoms. To locate the root cause accurately and timely in a large communication system is challenging because a single fault can often result in a large number of alarms, and multiple faults can occur concurrently. In this paper, we present a new fault localization method using a machine-learning approach. We propose to use logistic regression to study the correlation among network events based on end-to-end measurements. Then based on the regression model, we develop fault hypothesis that best explains the observed …

Go to article

The Missouri Miner, September 29, 2016 Sep 2016

The Missouri Miner, September 29, 2016

The Missouri Miner Newspaper

No abstract provided.

Go to article

Network Recovery After Massive Failures, Novella Bartolini, Stefano Ciavarella, Thomas F.La Porta, Simone Silvestri Sep 2016

Network Recovery After Massive Failures, Novella Bartolini, Stefano Ciavarella, Thomas F.La Porta, Simone Silvestri

Computer Science Faculty Research & Creative Works

This paper addresses the problem of efficiently restoring sufficient resources in a communications network to support the demand of mission critical services after a large-scale disruption. We give a formulation of the problem as a MILP and show that it is NP-hard. We propose a polynomial time heuristic, called Iterative Split and Prune (ISP) that decomposes the original problem recursively into smaller problems, until it determines the set of network components to be restored. We performed extensive simulations by varying the topologies, the demand intensity, the number of critical services, and the disruption model. Compared to several greedy approaches ISPper …

Go to article

Faculty Senate Minutes Sep. 22, 2016, Missouri University Of Science And Technology Faculty Senate Sep 2016

Faculty Senate Minutes Sep. 22, 2016, Missouri University Of Science And Technology Faculty Senate

Minutes & Agendas

No abstract provided.

Go to article

The Missouri Miner, September 22, 2016 Sep 2016

The Missouri Miner, September 22, 2016

The Missouri Miner Newspaper

No abstract provided.

Go to article

Faculty Senate Minutes Sep. 20, 2016, Missouri University Of Science And Technology Faculty Senate Sep 2016

Faculty Senate Minutes Sep. 20, 2016, Missouri University Of Science And Technology Faculty Senate

Minutes & Agendas

No abstract provided.

Go to article

A Novel Beam-Steering Nonlinear Nanoantenna With Surface Plasmon Resonance, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang, Wei E.I. Sha, Yat Hei Lo, Weng Cho Chew Sep 2016

A Novel Beam-Steering Nonlinear Nanoantenna With Surface Plasmon Resonance, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang, Wei E.I. Sha, Yat Hei Lo, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

Plasmonic nanostructures that support surface plasmon (SP) resonance potentially provide a route for the development of nanoengineered nonlinear optical media. In this work, a novel plasmonic particle-in-cavity nanoantenna (PIC-NA) is proposed. The second harmonic generation (SHG) of the PIC-NA under strong localized SP resonance is systematically analyzed by a self-consistent numerical solution based on boundary element method (BEM). The developed method solves the fundamental field and second harmonic (SH) field together iteratively to capture their mutual coupling. Strong enhancement of SHG from PIC-NA is achieved. The SHG enhancement factor is around four orders of magnitude, which is much higher than …

Go to article

A Full Wave Conductor Modeling Using Augmented Electric Field Integral Equation, Tian Xia, Hui Gan, Michael Wei, Qin Liu, Lijun Jiang, Weng Cho Chew, Henning Braunisch, Kemal Aygun, Zhiguo Qian, Alaeddin Aydiner Sep 2016

A Full Wave Conductor Modeling Using Augmented Electric Field Integral Equation, Tian Xia, Hui Gan, Michael Wei, Qin Liu, Lijun Jiang, Weng Cho Chew, Henning Braunisch, Kemal Aygun, Zhiguo Qian, Alaeddin Aydiner

Electrical and Computer Engineering Faculty Research & Creative Works

A numerical full wave solver is proposed to solve conductor problems in electromagnetics. This method is an extension of the dielectric augmented electric field integral equation (D-AEFIE). Using this method, conductors, from lowly lossy to highly lossy, can be rigorously modeled to capture the conductive losses. Broadband stability can be achieved, thanks to the introduction of the augmentation technique. This paper demonstrates the formulation of this method. A simple and effective preconditioner is introduced to accelerate the convergence. A novel integration scheme is adopted to accurately capture the losses inside the conductor. Finally some numerical examples are shown to support …

Go to article

Global Adjoint Sensitivity Analysis Of Coupled Coils Using Parameterized Model Order Reduction, Luca De Camillis, Giulio Antonini, Francesco Ferranti, Albert E. Ruehli Sep 2016

Global Adjoint Sensitivity Analysis Of Coupled Coils Using Parameterized Model Order Reduction, Luca De Camillis, Giulio Antonini, Francesco Ferranti, Albert E. Ruehli

Electrical and Computer Engineering Faculty Research & Creative Works

This paper presents a parameterized model order reduction technique for efficient global sensitivity analysis of coupled coils. It is based on the use of parameterized models for the electromagnetic matrices and the Krylov matrices of the original and corresponding adjoint systems, and congruence transformations. Numerical results confirm the efficiency and accuracy of the proposed method for global sensitivity analysis over the complete design space of interest.

Go to article

Comparison Of Mixed-Mode S-Parameters In Weak And Strong Coupled Differential Pairs, Marina Koledintseva, Tracey Vincent Sep 2016

Comparison Of Mixed-Mode S-Parameters In Weak And Strong Coupled Differential Pairs, Marina Koledintseva, Tracey Vincent

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, it is studied how the rate of coupling (weak vs. strong) in edge-coupled differential transmission lines on a printed circuit board (PCB) affects frequency behavior of mixed-mode S-parameters. This is important for signal integrity (SI), and also may be useful from electromagnetic compatibility (EMC) point of view, since the enhancement of mode conversion (from common-mode to differential mode, and vice versa) may result in common-mode noise in high-speed digital electronics. Slightly imbalanced in length microstrip and strip line differential pairs are considered. The study is done using full-wave numerical electromagnetic simulations. Various technological features are modeled in …

Go to article

Competition Between Hydrophilic And Argyrophilic Interactions In Surface Enhanced Raman Spectroscopy, John T. Kelly, Annie K. Mcclellan, Lynn V. Joe, Ashley M. Wright, Lawson T. Lloyd, Gregory S. Tschumper, Nathan I. Hammer Sep 2016

Competition Between Hydrophilic And Argyrophilic Interactions In Surface Enhanced Raman Spectroscopy, John T. Kelly, Annie K. Mcclellan, Lynn V. Joe, Ashley M. Wright, Lawson T. Lloyd, Gregory S. Tschumper, Nathan I. Hammer

Chemistry Faculty Research & Creative Works

The competition for binding and charge-transfer (CT) from the nitrogen containing heterocycle pyrimidine to either silver or to water in surface enhanced Raman spectroscopy (SERS) is discussed. The correlation between the shifting observed for vibrational normal modes and CT is analyzed both experimentally using Raman spectroscopy and theoretically using electronic structure theory. Discrete features in the Raman spectrum correspond to the binding of either water or silver to each of pyrimidine's nitrogen atoms with comparable frequency shifts. Natural bond orbital (NBO) calculations in each chemical environment reveal that the magnitude of charge transfer from pyrimidine to adjacent silver atoms is …

Go to article

Coupling Dgtd And Behavioral Macromodel For Transient Heterogeneous Electromagnetic Simulations, Huan Huan Zhang, Li (Lijun) Jun Jiang, He Ming Yao, Yu Zhang Sep 2016

Coupling Dgtd And Behavioral Macromodel For Transient Heterogeneous Electromagnetic Simulations, Huan Huan Zhang, Li (Lijun) Jun Jiang, He Ming Yao, Yu Zhang

Electrical and Computer Engineering Faculty Research & Creative Works

A novel transient field-circuit cosimulation method based on the discontinuous Galerkin time domain (DGTD) method and circuit behaviour macromodels for heterogeneous electromagnetics such as EMC problems is proposed. The traditional field-circuit simulation method needs to know the detail of the circuits, which cannot handle problems with unknown systems due to IP protections. To overcome this problem, the proposed method utilizes the artificial neural network (ANN) to create trainable behavioral macromodels of the unknown circuits based on the port currents and port voltages. The obtained macromodel is then coupled with DGTD that describes the behavior of electromagnetic subsystem to form equations …

Go to article

The Missouri Miner, September 15, 2016 Sep 2016

The Missouri Miner, September 15, 2016

The Missouri Miner Newspaper

No abstract provided.

Go to article

The Missouri Miner, September 8, 2016 Sep 2016

The Missouri Miner, September 8, 2016

The Missouri Miner Newspaper

No abstract provided.

Go to article

Protective Conversion Coating On Mixed-Metal Substrates And Methods Thereof, Matthew O'Keefe, Surender Maddela Sep 2016

Protective Conversion Coating On Mixed-Metal Substrates And Methods Thereof, Matthew O'Keefe, Surender Maddela

Materials Science and Engineering Faculty Research & Creative Works

Mixed-metal automotive vehicle bodies-in-white comprising ferrous metal surfaces, zinc surfaces, aluminum alloy surfaces, and magnesium alloy surfaces are cleaned and immersed in an aqueous bath comprising an adhesion promoter and an aqueous electrocoat bath (the adhesion promoter may be in the electrocoat bath. The adhesion promoter, which may be a cerium salt, is selected to react with each metal in the body surfaces to form an oxide layer that provides corrosion resistance for the surface and adherence for the deposited polymeric paint coating. The body is cathodic in the electrocoat deposition.

Go to article

Approximated Proportionate Affine Projection Algorithms For Block-Sparse Identification, Felix Albu, Jianming Liu, Steven L. Grant Sep 2016

Approximated Proportionate Affine Projection Algorithms For Block-Sparse Identification, Felix Albu, Jianming Liu, Steven L. Grant

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper two block-sparse approximated memory improved proportionate affine projection algorithm are proposed for block sparse system identification. An approximation is used for a recently proposed family of block-sparse proportionate affine projection algorithms. It is shown that the proposed algorithms have close convergence performance to the original ones, and they are less numerically complex. An investigation of the influence of their parameters is also presented.

Go to article

Scholars' Mine Quick Facts September 2016, James Roger Weaver Sep 2016

Scholars' Mine Quick Facts September 2016, James Roger Weaver

Scholars’ Mine Statistics

Scholars' Mine statistical quick facts for September 2016.

Go to article

The Missouri Miner, September 1, 2016 Sep 2016

The Missouri Miner, September 1, 2016

The Missouri Miner Newspaper

No abstract provided.

Go to article

Missouri S&T Magazine Fall/Winter 2016, Missouri S&T Marketing And Communications Department, Miner Alumni Association Sep 2016

Missouri S&T Magazine Fall/Winter 2016, Missouri S&T Marketing And Communications Department, Miner Alumni Association

Missouri S&T Magazine

No abstract provided.

Go to article

Magic Wavelength For The Hydrogen 1s-2s Transition: Contribution Of The Continuum And The Reduced-Mass Correction, Chandra M. Adhikari, A. Kawasaki, Ulrich D. Jentschura Sep 2016

Magic Wavelength For The Hydrogen 1s-2s Transition: Contribution Of The Continuum And The Reduced-Mass Correction, Chandra M. Adhikari, A. Kawasaki, Ulrich D. Jentschura

Physics Faculty Research & Creative Works

Recently, we studied the magic wavelength for the atomic hydrogen 1S-2S transition [A. Kawasaki, Phys. Rev. A 92, 042507 (2015)PLRAAN1050-294710.1103/PhysRevA.92.042507]. An explicit summation over virtual atomic states of the discrete part of the hydrogen spectrum was performed to evaluate the atomic polarizability. In this paper, we supplement the contribution of the continuum part of the spectrum and add the reduced-mass correction. The magic wavelength, at which the lowest-order ac Stark shifts of the 1S and 2S states are equal, is found to be 514.6 nm. The ac Stark shift at the magic wavelength is -221.6Hz/(kW/cm2), and the slope …

Go to article

The Concentration Of Stress At The Rotator Cuff Tendon-To-Bone Attachment Site Is Conserved Across Species, F. Saadat, A. C. Deymier, Victor Birman, S. Thomopoulos, G. M. Genin Sep 2016

The Concentration Of Stress At The Rotator Cuff Tendon-To-Bone Attachment Site Is Conserved Across Species, F. Saadat, A. C. Deymier, Victor Birman, S. Thomopoulos, G. M. Genin

Mechanical and Aerospace Engineering Faculty Research & Creative Works

No abstract provided.

Go to article

Broad-Spectrum Antibacterial Characteristics Of Four Novel Borate-Based Bioactive Glasses, Megan Ottomeyer, Ali Mohammadkah, D. E. Day, David J. Westenberg Sep 2016

Broad-Spectrum Antibacterial Characteristics Of Four Novel Borate-Based Bioactive Glasses, Megan Ottomeyer, Ali Mohammadkah, D. E. Day, David J. Westenberg

Materials Science and Engineering Faculty Research & Creative Works

Bioactive glasses have been developed for medical applications in the body for bone and tissue repair and regeneration. We have developed a borate-containing bioactive glass (13-93B3, referred to as B3), which is undergoing clinical trials to assess its wound-healing properties. To complement the healing properties of B3, metal ion dopants have been added to enhance its antimicrobial properties. Bioactive glasses doped with silver, gallium or iodine ions were found to have broad spectrum antimicrobial effects on clinically relevant bacteria including MRSA. While the B3 glass alone was sufficient to produce antibacterial effects on select bacteria, adding dopants enhanced the broad-spectrum …

Go to article

Selective Body Biasing For Post-Silicon Tuning Of Sub-Threshold Designs: A Semi-Infinite Programming Approach With Incremental Hypercubic Sampling, Hui Geng, Jianming Liu, Jinglan Liu, Pei Wen Luo, Liang Chia Cheng, Steven L. Grant, Yiyu Shi Sep 2016

Selective Body Biasing For Post-Silicon Tuning Of Sub-Threshold Designs: A Semi-Infinite Programming Approach With Incremental Hypercubic Sampling, Hui Geng, Jianming Liu, Jinglan Liu, Pei Wen Luo, Liang Chia Cheng, Steven L. Grant, Yiyu Shi

Electrical and Computer Engineering Faculty Research & Creative Works

Sub-threshold designs have become a popular option in many energies constrained applications. However, a major bottleneck for these designs is the challenge in attaining timing closure. Most of the paths in sub-threshold designs can become critical paths due to the purely random process variation on threshold voltage, which exponentially impacts the gate delay. In order to address timing violations caused by process variation, post-silicon tuning is widely used through body biasing technology, which incurs heavy power and area overhead. Therefore, it is imperative to select only a small group of the gates with body biasing for post-silicon-tuning. In this paper, …

Go to article

High-Frequency Instabilities Of Stationary Crossflow Vortices In A Hypersonic Boundary Layer, Fei Li, Meelan Choudhari, Pedro Paredes-Gonzalez, Lian Duan Sep 2016

High-Frequency Instabilities Of Stationary Crossflow Vortices In A Hypersonic Boundary Layer, Fei Li, Meelan Choudhari, Pedro Paredes-Gonzalez, Lian Duan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Hypersonic boundary layer flows over a circular cone at moderate incidence angle can support strong crossflow instability in between the windward and leeward rays on the plane of symmetry. Due to more efficient excitation of stationary crossflow vortices by surface roughness, such boundary layer flows may transition to turbulence via rapid amplification of the high-frequency secondary instabilities of finite-amplitude stationary crossflow vortices. The amplification characteristics of these secondary instabilities are investigated for crossflow vortices generated by an azimuthally periodic array of roughness elements over a 7° half-angle circular cone in a Mach 6 free stream. The analysis is based on …

Go to article

Directly Comparing Gw150914 With Numerical Solutions Of Einstein's Equations For Binary Black Hole Coalescence, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website. Sep 2016

Directly Comparing Gw150914 With Numerical Solutions Of Einstein's Equations For Binary Black Hole Coalescence, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.

Physics Faculty Research & Creative Works

We compare GW150914 directly to simulations of coalescing binary black holes in full general relativity, including several performed specifically to reproduce this event. Our calculations go beyond existing semianalytic models, because for all simulations - including sources with two independent, precessing spins - we perform comparisons which account for all the spin-weighted quadrupolar modes, and separately which account for all the quadrupolar and octopolar modes. Consistent with the posterior distributions reported by Abbott et al. [Phys. Rev. Lett. 116, 241102 (2016)] (at the 90% credible level), we find the data are compatible with a wide range of nonprecessing and …

Go to article

Experimental And Numerical Investigations Of Dust Effects On Surface Charging In Plasma, Kevin Chou, Daoru Frank Han, Joseph J. Wang Sep 2016

Experimental And Numerical Investigations Of Dust Effects On Surface Charging In Plasma, Kevin Chou, Daoru Frank Han, Joseph J. Wang

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A series of 3-D, fully kinetic particle-in-cell (PIC) simulations were performed to simulate mesothermal plasma flow self-consistently with surface charging. Simulation results of plasma charging of a conducting surface covered by a thin dust layer in a plasma of cold ions and thermal electrons are presented. The surface potentials and potentials inside the dust layer are compared with experimental results. Results show that a layer of dust over a conducting surface creates a capacitance, which drives the surface more negative with respect to the ambient plasma.

Go to article

All-Metal Structural Color Printing Based On Aluminum Plasmonic Metasurfaces, Z. Li, W. Wang, D. Rosenmann, D. Czaplewski, Xiaodong Yang, Jie Gao Sep 2016

All-Metal Structural Color Printing Based On Aluminum Plasmonic Metasurfaces, Z. Li, W. Wang, D. Rosenmann, D. Czaplewski, Xiaodong Yang, Jie Gao

Mechanical and Aerospace Engineering Faculty Research & Creative Works

No abstract provided.

Go to article

First Prev Next Last