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Simulation Of Electromagnetic Waves In The Magnetized Cold Plasma By A Dgfetd Method, Ping Li, Li (Lijun) Jun Jiang Oct 2013

Simulation Of Electromagnetic Waves In The Magnetized Cold Plasma By A Dgfetd Method, Ping Li, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

The properties of electromagnetic waves propagating in magnetized plasma slabs and scattering from plasma coated spheres are investigated using the discontinuous Galerkin finite-element time-domain (DGFETD) method. The magnetized plasma is a kind of gyroelectric anisotropic dispersive medium. This anisotropy must be described by an electric permittivity tensor with both nonzero diagonal and off-diagonal elements. Instead of doing the convolution directly in the time domain, an auxiliary differential equations (ADE) method is employed to represent the constitutive relation. The algorithm is validated by studying the transmission characteristics via electron-composed plasma slabs and radar cross section (RCS) of plasma-coated spheres. All numerical …

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Faculty Senate Minutes October 24, 2013, Missouri University Of Science And Technology Faculty Senate Oct 2013

Faculty Senate Minutes October 24, 2013, Missouri University Of Science And Technology Faculty Senate

Minutes & Agendas

No abstract provided.

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The Missouri Miner, October 24, 2013 Oct 2013

The Missouri Miner, October 24, 2013

The Missouri Miner Newspaper

No abstract provided.

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Engineered Nanotopography On Electrospun Plla Microfibers Modifies Raw 264.7 Cell Response, Nicholas J. Schaub, Tara Britton, Rupak Rajachar, Ryan J. Gilbert Oct 2013

Engineered Nanotopography On Electrospun Plla Microfibers Modifies Raw 264.7 Cell Response, Nicholas J. Schaub, Tara Britton, Rupak Rajachar, Ryan J. Gilbert

Chemical and Biochemical Engineering Faculty Research & Creative Works

In this study, we created a new method of electrospinning capable of controlling the surface structure of individual fibers (fiber nano topography). The nano topographical features were created by a phase separation in the fibers as they formed. To control the phase separation, a nonsolvent (a chemical insoluble with the polymer) was added to an electrospinning solution containing poly-l-lactic acid (PLLA) and chloroform. The nano topography of electro spun fibers in the PLLA/chloroform solution was smooth. However, adding a small weight (< 2% of total solution) of a single nonsolvent (water, ethanol, or dimethyl sulfoxide) generated nanoscale depressions on the surface of the fibers unique to the nonsolvent added. Additionally, nanoscale depressions on electro spun fibers were observed to change with dimethyl sulfoxide (DMSO) concentration in the PLLA/chloroform solution. A nonlinear relationship was found between the concentration of DMSO and the number and size of nano topographical features. The surface depressions did not alter the hydrophobicity of the scaffold or degradation of the scaffold over a two-day period. To determine if fiber nano topography altered cell behavior, macrophages (RAW 264.7 cells) were cultured on fibers with a smooth nano topography or fibers with nanoscale depressions. RAW 264.7 cells spread less on fibers with nanoscale depressions than fibers with a smooth topography (p < 0.05), but there were no differences between groups with regard to cell metabolism or the number of adherent cells. The results of this study demonstrate the necessity to consider the nano topography of individual fibers as these features may affect cellular behavior. More importantly, we demonstrate a versatile method of controlling electro spun fiber nano topography. © 2013 American Chemical Society.

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Operation-State Monitoring And Energization-Status Identification For Underground Power Cables By Magnetic Field Sensing, Xu Sun, Chun Kit Poon, Geoffrey Chan, Cher Leung Sum, Wing Kin Lee, Lijun Jiang, Philip W.T. Pong Oct 2013

Operation-State Monitoring And Energization-Status Identification For Underground Power Cables By Magnetic Field Sensing, Xu Sun, Chun Kit Poon, Geoffrey Chan, Cher Leung Sum, Wing Kin Lee, Lijun Jiang, Philip W.T. Pong

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a novel nondestructive method based on magnetic field sensing is proposed for underground power cable operation-state monitoring and energization-status identification. The magnetic field distribution of the cable is studied using finite element method (FEM) for the power cable operating in different states, i.e., current-energized state (the cable is energized and carries load current) and voltage-energized state (the cable is energized but carries no load current). This innovative method can reconstruct all the source parameters of the cable based on a set of measured magnetic field values. Stochastic optimization technique is applied to realize the reconstruction based on …

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Analysis Of Closed-Loop Acoustic Feedback Cancellation Systems, Meng Guo, Soren Holdt Jensen, Jesper Jensen, Steven L. Grant Oct 2013

Analysis Of Closed-Loop Acoustic Feedback Cancellation Systems, Meng Guo, Soren Holdt Jensen, Jesper Jensen, Steven L. Grant

Engineering Management and Systems Engineering Faculty Research & Creative Works

In a previous study, the performance of an acoustic feedback/echo cancellation system was analyzed using a power transfer function method. Whereas the analysis result provides very accurate performance predictions in open-loop acoustic echo cancellation systems, it is less accurate in closed-loop acoustic feedback cancellation systems if there is a strong correlation between the loudspeaker signal and the signals entering the microphones. This work extends the performance analysis to include the effects of the nonzero correlation on the adaptive filters. Simulation results verify that this extension provides much more accurate performance predictions in closed-loop acoustic feedback cancellation systems. © 2013 IEEE.

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Nonlinear Acoustic Echo Cancellation Using Feedback, Pratik Shah, Ian Lewis, Steven Grant, Sylvain Angrignon Oct 2013

Nonlinear Acoustic Echo Cancellation Using Feedback, Pratik Shah, Ian Lewis, Steven Grant, Sylvain Angrignon

Electrical and Computer Engineering Faculty Research & Creative Works

Acoustic echo cancellation (AEC) is a well-studied problem. One of the main assumptions in existing AEC techniques is that the echo path is linear. In today's equipment, this assumption does always hold. The increasing focus on the look and feel of commercial devices and consequently the decreasing size of their loudspeakers are the major contributors to making the echo path nonlinear. This emphasizes the need for a nonlinear echo canceler to maintain the required echo return loss enhancement (ERLE). Many algorithms have been proposed to solve this problem, but they are prohibitive because of their high computational complexity. This paper …

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The Kalman Filter For Linear Systems On Time Scales, Martin Bohner, Nick Wintz Oct 2013

The Kalman Filter For Linear Systems On Time Scales, Martin Bohner, Nick Wintz

Mathematics and Statistics Faculty Research & Creative Works

We introduce the Kalman filter for linear systems on time scales, which includes the discrete and continuous versions as special cases. When the system is also stochastic, we show that the Kalman filter is an observer that estimates the system when the state is corrupted by noisy measurements. Finally, we show that the duality of the Kalman filter and the Linear Quadratic Regulator (LQR) is preserved in their unification on time scales. A numerical example is provided. © 2013 Elsevier Ltd.

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Minkowski And Beckenbach-Dresher Inequalities And Functionals On Time Scales, Rabia Bibi, Martin Bohner, Josip Pečarić, Sanja Varǒsanec Oct 2013

Minkowski And Beckenbach-Dresher Inequalities And Functionals On Time Scales, Rabia Bibi, Martin Bohner, Josip Pečarić, Sanja Varǒsanec

Mathematics and Statistics Faculty Research & Creative Works

We obtain integral forms of the Minkowski inequality and Beckenbach-Dresher inequality on time scales. Also, we investigate a converse of Minkowski's inequality and several functionals arising from the Minkowski inequality and the Beckenbach-Dresher inequality. © ELEMENT, Zagreb.

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The Missouri Miner, October 10, 2013 Oct 2013

The Missouri Miner, October 10, 2013

The Missouri Miner Newspaper

No abstract provided.

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Leveraging Platoon Dispersion For Sybil Detection In Vehicular Networks, Muhammad Al Mutaz, Levi Malott, Sriram Chellappan Oct 2013

Leveraging Platoon Dispersion For Sybil Detection In Vehicular Networks, Muhammad Al Mutaz, Levi Malott, Sriram Chellappan

Computer Science Faculty Research & Creative Works

A Sybil attack is one where an adversary assumes multiple identities with the purpose of defeating the trust of an existing reputation system. When Sybil attacks are launched in vehicular networks, an added challenge in detecting malicious nodes is mobility that makes it increasingly difficult to tie a node to the location of attacks. In this paper, we present an innovative protocol for Sybil detection in vehicular networks. Considering that vehicular networks are cyber-physical systems integrating cyber and physical components, our technique exploits well-grounded results in the physical (i.e., transportation) domain to tackle the Sybil problem in the cyber domain. …

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Stochastic Optimal Controller Design For Uncertain Nonlinear Networked Control System Via Neuro Dynamic Programming, Hao Xu, Sarangapani Jagannathan Oct 2013

Stochastic Optimal Controller Design For Uncertain Nonlinear Networked Control System Via Neuro Dynamic Programming, Hao Xu, Sarangapani Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

The stochastic optimal controller design for the nonlinear networked control system (NNCS) with uncertain system dynamics is a challenging problem due to the presence of both system nonlinearities and communication network imperfections, such as random delays and packet losses, which are not unknown a priori. In the recent literature, neuro dynamic programming (NDP) techniques, based on value and policy iterations, have been widely reported to solve the optimal control of general affine nonlinear systems. However, for real-time control, value and policy iterations-based methodology are not suitable and time-based NDP techniques are preferred. In addition, output feedback-based controller designs are preferred …

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The Missouri Miner, October 3, 2013 Oct 2013

The Missouri Miner, October 3, 2013

The Missouri Miner Newspaper

No abstract provided.

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Encapsulation Of Supported Metal Nanoparticles With An Ultra-Thin Porous Shell For Size-Selective Reactions, Zeyu Shang, Rajankumar L. Patel, Brian W. Evanko, Xinhua Liang Oct 2013

Encapsulation Of Supported Metal Nanoparticles With An Ultra-Thin Porous Shell For Size-Selective Reactions, Zeyu Shang, Rajankumar L. Patel, Brian W. Evanko, Xinhua Liang

Chemical and Biochemical Engineering Faculty Research & Creative Works

A novel nanostructured catalyst with an ultra-thin, porous shell obtained from the thermal decomposition of an aluminum alkoxide film deposited by molecular layer deposition for size-selective reactions was developed. The molecular sieving capability of the porous metal oxide films was verified by examining the liquid-phase hydrogenation of n-hexene versus cis-cyclooctene. © 2013 The Royal Society of Chemistry.

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Administration Of Murine Stromal Vascular Fraction Ameliorates Chronic Experimental Autoimmune Encephalomyelitis, Julie A. Semon, Xiujuan Zhang, Armitabh C. Pandey, Sandra M. Alandete, Catherine Maness, Shijia Zhang, Brittni A. Scruggs, Amy L. Strong, Steven A. Sharkey, For Full List Of Authors, See Publisher's Website. Oct 2013

Administration Of Murine Stromal Vascular Fraction Ameliorates Chronic Experimental Autoimmune Encephalomyelitis, Julie A. Semon, Xiujuan Zhang, Armitabh C. Pandey, Sandra M. Alandete, Catherine Maness, Shijia Zhang, Brittni A. Scruggs, Amy L. Strong, Steven A. Sharkey, For Full List Of Authors, See Publisher's Website.

Biological Sciences Faculty Research & Creative Works

Administration of adipose-derived stromal/stem cells (ASCs) represents a promising therapeutic approach for autoimmune diseases since they have been shown to have immunomodulatory properties. The uncultured, nonexpanded counterpart of ASCs, the stromal vascular fraction (SVF), is composed of a heterogeneous mixture of cells. Although administration of ex vivo culture-expanded ASCs has been used to study immunomodulatory mechanisms in multiple models of autoimmune diseases, less is known about SVF-based therapy. The ability of murine SVF cells to treat myelin oligodendrocyte glycoprotein35-55-induced experimental autoimmune encephalitis (EAE) was compared with that of culture-expanded ASCs in C57Bl/6J mice. A total of 1 x …

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Age Of The Donor Reduces The Ability Of Human Adipose-Derived Stem Cells To Alleviate Symptoms In The Experimental Autoimmune Encephalomyelitis Mouse Model, Brittni A. Scruggs, Julie A. Semon, Xiujuan Zhang, Shijia Zhang, Annie C. Bowles, Amitabh C. Pandey, Kathleen M. P. Imhof, Allan V. Kalueff, Jeffrey M. Gimble, Bruce A. Bunnell Oct 2013

Age Of The Donor Reduces The Ability Of Human Adipose-Derived Stem Cells To Alleviate Symptoms In The Experimental Autoimmune Encephalomyelitis Mouse Model, Brittni A. Scruggs, Julie A. Semon, Xiujuan Zhang, Shijia Zhang, Annie C. Bowles, Amitabh C. Pandey, Kathleen M. P. Imhof, Allan V. Kalueff, Jeffrey M. Gimble, Bruce A. Bunnell

Biological Sciences Faculty Research & Creative Works

There is a significant clinical need for effective therapies for primary progressive multiple sclerosis, which presents later in life (i.e., older than 50 years) and has symptoms that increase in severity without remission. With autologous mesenchymal stem cell therapy now in the early phases of clinical trials for all forms of multiple sclerosis (MS), it is necessary to determine whether autologous stem cells from older donors have therapeutic effectiveness. In this study, the therapeutic efficacy of human adipose-derived mesenchymal stem cells (ASCs) from older donors was directly compared with that of cells from younger donors for disease prevention. Mice were …

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Neuropeptide W Increases Mean Arterial Pressure As A Result Of Behavioral Arousal, Alicia T. Pate, Gina L.C. Yosten, Willis K. Samson Oct 2013

Neuropeptide W Increases Mean Arterial Pressure As A Result Of Behavioral Arousal, Alicia T. Pate, Gina L.C. Yosten, Willis K. Samson

Biological Sciences Faculty Research & Creative Works

Neuropeptide W (NPW), an endogenous ligand for G protein-coupled receptors NPBWR1 (GPR7) and NPBWR2 (GPR8), has been detected in neurons in limbic and reticular activating system areas known to be important in arousal, as well as hypothalamic nuclei known to be important in food and water intake and the neuroendocrine response to stress. In rat, central administration of NPW increased mean arterial pressure (MAP) and behaviors associated with locomotion and grooming. We hypothesized that the NPW-induced increase in MAP was secondary to those increases in physical activity. Since peptides that stimulate arousal have been shown to increase sympathetic activity (e.g., …

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Phases And Phase Transitions In Disordered Quantum Systems, Thomas Vojta Oct 2013

Phases And Phase Transitions In Disordered Quantum Systems, Thomas Vojta

Physics Faculty Research & Creative Works

These lecture notes give a pedagogical introduction to phase transitions in disordered quantum systems and to the exotic Griffiths phases induced in their vicinity. We first review some fundamental concepts in the physics of phase transitions. We then derive criteria governing under what conditions spatial disorder or randomness can change the properties of a phase transition. After introducing the strong-disorder renormalization group method, we discuss in detail some of the exotic phenomena arising at phase transitions in disordered quantum systems. These include infinite-randomness criticality, rare regions and quantum Griffiths singularities, as well as the smearing of phase transitions. We also …

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Measuring The Angle-Dependent Photoionization Cross Section Of Nitrogen Using High-Harmonic Generation, Xiaoming Ren, Varun Makhija, Anh-Thu Le, Jan Troß, Sudipta Mondal, Cheng Jin, Vinod Kumarappan, Carlos A. Trallero-Herrero Oct 2013

Measuring The Angle-Dependent Photoionization Cross Section Of Nitrogen Using High-Harmonic Generation, Xiaoming Ren, Varun Makhija, Anh-Thu Le, Jan Troß, Sudipta Mondal, Cheng Jin, Vinod Kumarappan, Carlos A. Trallero-Herrero

Physics Faculty Research & Creative Works

We exploit the relationship between high harmonic generation (HHG) and the molecular photorecombination dipole to extract the molecular-frame differential photoionization cross section (PICS) in the extreme ultraviolet (XUV) for molecular nitrogen. A shape resonance and a Cooper-type minimum are reflected in the pump-probe time delay measurements of different harmonic orders, where high-order rotational revivals are observed in N₂. We observe the energy- and angle-dependent Cooper minimum and shape resonance directly in the laboratory-frame HHG yield by achieving a high degree of alignment, [SEE FORMULA IN ABSTRACT cos2 θ] 0.8. The interplay between PICS and rotational revivals is confirmed by simulations …

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Kinetic Simulations Of Plasma Plume Potential In A Vacuum Chamber, Joseph J. Wang, Daoru Frank Han, Yuan Hu Oct 2013

Kinetic Simulations Of Plasma Plume Potential In A Vacuum Chamber, Joseph J. Wang, Daoru Frank Han, Yuan Hu

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Direct Simulation Monte Carlo and Particle-in-Cell simulations are carried out to study the potential of a mesothermal plasma plume in a vacuum chamber. The results show that the beam potential with respect to the ambient in a vacuum chamber is different from that in space because the facility plasma can prematurely terminate the plume expansion process. As a result, the plume potential measured in a vacuum chamber may be significantly lower than that under the in-space condition. This can lead to under estimation of the backflow of CEX ions and ionized contaminants in plasma thruster plume modeling.

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The Carriers Of The Interstellar Unidentified Infrared Emission Features: Constraints From The Interstellar C-H Stretching Features At 3.2-3.5 Μm, Xuejuan Yang, Rainer Glaser, Aigen Li, Jianxin Zhong Oct 2013

The Carriers Of The Interstellar Unidentified Infrared Emission Features: Constraints From The Interstellar C-H Stretching Features At 3.2-3.5 Μm, Xuejuan Yang, Rainer Glaser, Aigen Li, Jianxin Zhong

Chemistry Faculty Research & Creative Works

The unidentified infrared emission (UIE) features at 3.3, 6.2, 7.7, 8.6, and 11.3 μm, commonly attributed to polycyclic aromatic hydrocarbon (PAH) molecules, have recently been ascribed to mixed aromatic/aliphatic organic nanoparticles. More recently, an upper limit of <9% was placed on the aliphatic fraction (i.e., the fraction of carbon atoms in aliphatic form) of the UIE carriers based on the observed intensities of the 3.4 μm and 3.3 μm emission features by attributing them to aliphatic and aromatic C-H stretching modes, respectively, and assuming A 3.4/A 3.3 ≈ 0.68 derived from a small set of aliphatic and aromatic compounds, where A 3.4 and A 3.3 are, respectively, the band strengths of the 3.4 μm aliphatic and 3.3 μm aromatic C-H bonds. To improve the estimate of the aliphatic fraction of the UIE carriers, here we analyze 35 UIE sources exhibiting both the 3.3 μm and …

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Gas Barrier And Mechanical Properties Of Crosslinked Ethylene Vinyl Acetate Nanocomposites, S. A. Ahmad Ramazani, M. Shafiee, Hossein Abedsoltan, A. Shafiee Oct 2013

Gas Barrier And Mechanical Properties Of Crosslinked Ethylene Vinyl Acetate Nanocomposites, S. A. Ahmad Ramazani, M. Shafiee, Hossein Abedsoltan, A. Shafiee

Chemical and Biochemical Engineering Faculty Research & Creative Works

In this research, the effects of crosslinking agent and clay content on the morphology, barrier and mechanical properties of ethylene vinyl acetate-organoclay nanocomposites prepared by solution method were studied. Dicumyl peroxide has been used as crosslinking agent. The morphology of the prepared nanocomposites was investigated using wide-angle X-ray diffraction and transmission electron microscopy. Wide-angle X-ray diffraction and transmission electron microscopy indicated that the prepared nanocomposites had predominantly intercalated morphologies. The obtained results of permeability tests showed that the permeability of ethylene vinyl acetate films dramatically decreases with addition of organoclay and dicumyl peroxide. Mechanical tests showed that tensile modulus and …

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Capacitive Properties And Structure Of Ruo₂-Hfo₂ Films Prepared By Thermal Decomposition Method, Xuehua Liu, Junqiu Zhu, Xin Wang, Jinghua Sun, Zhongzhi Tang, Teng Zhang, Matthew O'Keefe, Dian Tang Oct 2013

Capacitive Properties And Structure Of Ruo₂-Hfo₂ Films Prepared By Thermal Decomposition Method, Xuehua Liu, Junqiu Zhu, Xin Wang, Jinghua Sun, Zhongzhi Tang, Teng Zhang, Matthew O'Keefe, Dian Tang

Materials Science and Engineering Faculty Research & Creative Works

Binary RuO2-HfO2 films on Ti substrates were prepared by a thermal decomposition method. cyclic voltammetric and charge/discharge properties of the RuO2-HfO2 electrodes were characterized. It was determined that the incorporation of HfO2 into RuO 2 greatly improved the capacitive properties of the material. The RuO2-HfO2 electrodes showed excellent cyclic stability, with no decay in charge capability during 1000 CV cycles in acidic solution. A nominal content of 50 mol% RuO2 and 50 mol% HfO2 gave the highest specific capacitance of 789.3 F/g (RuO2). The excellent capacitive …

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Development Of An Experimental Testbed For Research In Lithium-Ion Battery Management Systems, Nima Lotfi, Poria Fajri, Samuel Novosad, Jack Savage, Robert G. Landers, Mehdi Ferdowsi Oct 2013

Development Of An Experimental Testbed For Research In Lithium-Ion Battery Management Systems, Nima Lotfi, Poria Fajri, Samuel Novosad, Jack Savage, Robert G. Landers, Mehdi Ferdowsi

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Advanced electrochemical batteries are becoming an integral part of a wide range of applications from household and commercial to smart grid, transportation, and aerospace applications. Among different battery technologies, lithium-ion (Li-ion) batteries are growing more and more popular due to their high energy density, high galvanic potential, low self-discharge, low weight, and the fact that they have almost no memory effect. However, one of the main obstacles facing the widespread commercialization of Li-ion batteries is the design of reliable battery management systems (BMSs). An efficient BMS ensures electrical safety during operation, while increasing battery lifetime, capacity and thermal stability. Despite …

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Making Reliable Shear-Wave Splitting Measurements, Kelly H. Liu, Stephen S. Gao Oct 2013

Making Reliable Shear-Wave Splitting Measurements, Kelly H. Liu, Stephen S. Gao

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Shear-wave splitting (SWS) analysis using SKS, SKKS, and PKS (hereafter collectively called XKS) phases is one of the most commonly used techniques in structural seismology. In spite of the apparent simplicity in performing SWS measurements, large discrepancies in published SWS parameters (fast direction and splitting time) suggest that a significant portion of splitting parameters has been incorrectly determined. Here, based on the popularly used minimization of transverse energy technique, we present a procedure that combines automatic data processing and careful manual screening, which includes adjusting the XKS window used for splitting analysis, modifying band-pass filtering corner frequencies, and verifying and …

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The Bridge Newsletter Winter 2013, Missouri University Of Science And Technology Oct 2013

The Bridge Newsletter Winter 2013, Missouri University Of Science And Technology

The Bridge Newsletter

-Roof turned into teaching tool
-Prakash recognized
-Alumna of the Year
-Super Miners

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Phytotechnologies - Preventing Exposures, Improving Public Health, Heather F. Henry, Joel Gerard Burken, Raina M. Maier, Lee A. Newman, Steven Rock, Jerald L. Schnoor, William A. Suk Oct 2013

Phytotechnologies - Preventing Exposures, Improving Public Health, Heather F. Henry, Joel Gerard Burken, Raina M. Maier, Lee A. Newman, Steven Rock, Jerald L. Schnoor, William A. Suk

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Phytotechnologies Have Potential to Reduce the Amount or Toxicity of Deleterious Chemicals and Agents, and Thereby, Can Reduce Human Exposures to Hazardous Substances. as Such, Phytotechnologies Are Tools for Primary Prevention in Public Health. Recent Research Demonstrates Phytotechnologies Can Be Uniquely Tailored for Effective Exposure Prevention in a Variety of Applications. in Addition to Exposure Prevention, Plants Can Be Used as Sensors to Identify Environmental Contamination and Potential Exposures. in This Paper, We Have Presented Applications and Research Developments in a Framework to Illustrate How Phytotechnologies Can Meet Basic Public Health Needs for Access to Clean Water, Air, and Food. …

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Plants As Bio-Indicators Of Subsurface Conditions: Impact Of Groundwater Level On Btex Concentrations In Trees, Jordan Wilson, Rachel Bartz, Matt Limmer, Joel Gerard Burken Oct 2013

Plants As Bio-Indicators Of Subsurface Conditions: Impact Of Groundwater Level On Btex Concentrations In Trees, Jordan Wilson, Rachel Bartz, Matt Limmer, Joel Gerard Burken

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Numerous Studies Have Demonstrated Trees' Ability to Extract and Translocate Moderately Hydrophobic Contaminants, and Sampling Trees for Compounds Such as BTEX Can Help Delineate Plumes in the Field. However, When BTEX is Detected in the Groundwater, Detection in Nearby Trees is Not as Reliable an Indicator of Subsurface Contamination as Other Compounds Such as Chlorinated Solvents. Aerobic Rhizospheric and Bulk Soil Degradation is a Potential Explanation for the Observed Variability of BTEX in Trees as Compared to Groundwater Concentrations. the Goal of This Study Was to Determine the Effect of Groundwater Level on BTEX Concentrations in Tree Tissue. the Central …

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Loop-Tree Free Augmented Equivalence Principle Algorithm For Low-Frequency Problems, Zu Hui Ma, Li (Lijun) Jun Jiang, Weng Cho Chew Oct 2013

Loop-Tree Free Augmented Equivalence Principle Algorithm For Low-Frequency Problems, Zu Hui Ma, Li (Lijun) Jun Jiang, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

In this article, we describe a newly developed integral equation domain decomposition method for solving complex low frequency electromagnetic problems. This method is based on low frequency augmented equivalence principle algorithm (EPA) with the augmented electric field integral equation (A-EFIE). The A-EFIE provides a stable solution in the low-frequency regime as it includes both charge and current as unknowns to avoid the imbalance between the vector potential and the scalar potential. Based on similar idea, the augmented EPA can suppress the projection error resulting from low-frequency problems of the normal EPA. Combining these two methods, the proposed algorithm can be …

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Inefficiency In Japanese Water Utility Firms: A Stochastic Frontier Approach, Michelle Phillips Oct 2013

Inefficiency In Japanese Water Utility Firms: A Stochastic Frontier Approach, Michelle Phillips

Economics Faculty Research & Creative Works

I examine inefficiencies in Japanese water utility companies. Efficiency in this context is defined as a firm's capacity to maximize output given a fixed level of inputs. The findings suggest that the average operation rate, customer density and size variables are associated with lower levels of inefficiency (or higher levels of efficiency), while water purification (a conditioning variable capturing low initial water quality), subsidies and outsourcing are associated with higher levels of inefficiency. Since inefficiency exists, there is an opportunity to improve Japanese water utilities by working on emulating "best practice" firms whenever possible and by providing a regulatory framework …

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