Digital Commons Network^™

Optical Microresonator Based On Hollow Sphere With Porous Wall For Chemical Sensing, Hanzheng Wang, Lei Yuan, Cheol Woon Kim, Qun Han, Tao Wei, Xinwei Lan, Hai Xiao

Nuclear Engineering and Radiation Science Faculty Research & Creative Works

A porous-wall hollow glass microsphere (PW-HGM) was investigated as an optical resonator for chemical vapor sensing. a single mode optical fiber taper was used to interrogate the micro resonator. Adsorption of chemical molecules into the nanosized pores induced a refractive index change of the thin wall and thus a shift in its resonance spectrum. the PW-HGM resonator had shown higher vapor detection sensitivity in comparison with a solid microsphere under similar test conditions. © 2011 Optical Society of America.

Review Of Copyright Law For Librarians And Educators: Creative Strategies And Practical Solutions, Third Edition, By Kenneth D. Crews, James Roger Weaver

University Libraries Faculty Research & Creative Works

No abstract provided.

3d Finite Element Analysis Of Pwa-Oil Sand Terrain System Interaction, Y. Li, Samuel Frimpong, W. Y. Liu

Mining Engineering Faculty Research & Creative Works

A simulator for analyzing the interaction between the oil sand terrain and a pipe wagon articulating (PWA) system has been developed in this paper. An elastic-plastic oil sand model was built based on the finite element analysis (FEA) method and von Mises yield criterion using the Algor mechanical event simulation (MES) software. The three-dimensional (3D) distribution of the stress, strain, nodal displacement, and deformed shape of the oil sands was animated at an environmental temperature of 25C. The 3D behavior of the oil sand terrain was investigated with different loading conditions. The effect of the load and contact area on …

Electronic Musical Instrument To Generate Musical Tones To Imitate A Stringed Instrument, M. Nakagawa, Shun Takai, Shun Takai

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Provided are an electronic musical instrument, computer Storage device, and method for generating tone. A sound source in an electronic musical instrument generates a first tone at a first pitch in response to a first tone generation instruction received by an input device of the electronic musical instrument. A second tone generation instruction is received to generate a second tone at a second pitch while generating the first tone at the sound source. A determination is made of a pitch difference of the first and the second pitches. The sound source is controlled to generate the second tone and to …

Directional Anisotropy In The Mechanical Behavior Of Friction Stir Processed And Aged Az91 Alloy, Vipin Jain, Wei Yuan, R. S. Mishra, Gouthama, Anil K. Gupta

Materials Science and Engineering Faculty Research & Creative Works

Friction stir processing (FSP) is an emerging grain refinement technique for magnesium alloys. in this study, a cast AZ91 alloy was processed by a single-pass FSP to achieve an average grain size of ∼6 μm in the nugget zone. the FSP is found to introduce texture in the alloy due to preferred alignment of basal poles in the processing direction. the mechanical behavior is significantly influenced by texture. after FSP, the alloy was aged at different temperatures and times for continuous and discontinuous precipitation of β-Mg17Al12. a high anisotropy in yield stress is observed in the processing and transverse direction …

Equivalent Circuit Model Of Coaxial Probes For Patch Antennas, Y. S. Hu, Yanzhi Zhang, Jun Fan

Mathematics and Statistics Faculty Research & Creative Works

An equivalent circuit model of coaxial probes is derived directly from the intrinsic via circuit model. as all the higher-order evanescent modes have been included analytically in the parasitic circuit elements, only the propagating mode needs to be considered by the simplest uniform-current model of a coaxial probe in numerical solvers such as -nite element method (FEM) or -nite divergence time domain (FDTD). This avoids dense meshes or sub-gridding techniques and greatly reduces the computational efforts for accurate calculation of the probe input impedance. the derived equivalent circuit model and the new feeding technique have been validated by both analytical …

An Investigation Of Guiding Of Positrons Through Insulating Capillaries, Robert D. Dubois, K. Tökési

Physics Faculty Research & Creative Works

Guiding of diffuse low-intensity positron and electron beams through macroscopic tapered insulating capillaries was investigated. Transmitted positrons and electrons were observed. However, further investigations are necessary to clarify whether the transmitted particles are a true indication of guiding or simply due to a range of diffuse angles of the incoming beams.

Triply Differential Measurements For Single Ionization Of Molecular Nitrogen By 250 Ev Positron Impact, Robert D. Dubois, O. G. De Lucio

Physics Faculty Research & Creative Works

Triply differential cross sections are presented for 250 eV positron impact single ionization of molecular nitrogen. Data are presented for binary and recoil interactions resulting from projectiles being scattered between 0 and 5 degrees and energy losses up to approximately 50 eV.

X-Ray Emission Cross Sections Following Charge Exchange Collisions On Neutral Targets: The Role Of Multiple Electron Capture, Sebastian Otranto, Ronald E. Olson

Physics Faculty Research & Creative Works

Line emission and charge exchange cross sections obtained from a three-active electrons CTMC code allow us to determine the role of multiple electron capture for charge exchange collisions on neutral argon and neon. the present results can be compared to recent experimental data from EBIT groups operating at Liver-more, NIST and Berlin.

Reaction Dynamics In Double Ionization Of Helium By Electron Impact, Michael Schulz, M. F. Ciappina, T. Kirchner

Physics Faculty Research & Creative Works

Multiple differential cross sections for double ionization of helium by electron impact were calculated within various models. using a Monte Carlo Event Generator technique, additional physics, not included in the primary calculations, are modeled and cross sections are convoluted with the experimental resolution.

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

Physics Faculty Research & Creative Works

Using data taken from the literature, the scaling of electron loss cross sections as a function of target Z was investigated. It was found that for energies /u, a wide range of systems demonstrated very similar target Z dependences where, for heavier targets, the slope increased very slowly with impact energy. at higher energies, this increase was much faster. a "universal" formula capable of fitting these dependences is being developed.

Scattering Angle Dependence Of Double Differential Cross Sections For Dissociative Ionization Of H2 By Proton Impact, Michael Schulz, K. Egodapitiya, S. Sharma, A. C. Laforge

Physics Faculty Research & Creative Works

We have measured double differential cross sections for dissociative ionization of H₂ by 75 keV proton impact for fixed energy losses as a function scattering angle. the data exhibit an oscillating pattern with a frequency about twice as large as found earlier for non-dissociative ionization. © Published under licence by IOP Publishing Ltd.

Electron Transfer And Ionization In Collisions Of He-Like Ions With Na(3s) And Na(3p), I. Blank, S. Otrantcr, C. Meinema, Ronald E. Olson, R. Hoekstra

Physics Faculty Research & Creative Works

Single electron transfer and ionization in collisions of He-like ions (N⁵⁺, O⁶⁺, Ne⁸⁺) and Na has been investigated both experimentally and theoretically at energies around the matching velocity of the valence electron (2 to 10 keV/amu). State selective cross sections and scattering angle distributions were obtained using recoil-ion momentum spectroscopy in combination with a magneto-optically cooled Na atom target. a strong dependence of the relative cross sections on the collision energy is observed. the results are compared with Classical-Trajectory Monte Carlo (CTMC) calculations and show an overall very good agreement.

Multiple Ionization Of Ne In Coincidence With Partially Stripped B ²⁺ Ions In The Intermediate Energy Regime, W. Wolff, H. Luna, A. C.F. Santos, E. C. Montenegro, Robert D. Dubois, C. C. Montanari, J. E. Miraglia

Physics Faculty Research & Creative Works

A projectile ion-recoil ion and electron-recoil ion coincidence technique has been used to study the multiple ionization process in collisions of 0.75-4.0MeV B²⁺ with Ne atoms. Absolute total and partial pure ionization cross sections are reported for the first time at these impact energies with the present setup. the relative contribution of each recoil charge state has been investigated. the experimental data are compared to CDW-EIS calculation and with He²⁺ projectiles. the data throw further light on the effect of projectile screening in the ionization of multi-electronic targets and provide a support for the validity of the CDW-EIS …

Systematic Analysis Of Four-Particle Dalitz Plots For Double Ionization, Michael Schulz, D. Fischer, K. Schneider, R. Moshammer, J. Ullrich, M. F. Ciappina, T. Kirchner

Physics Faculty Research & Creative Works

Four particle Dalitz plots for double ionization of helium by ion impact were analyzed.

Kinematically Complete Studies On Mutual Projectile And Target Ionization, X. Wang, D. Fischer, A. Kelkar, K. Schneider, Michael Schulz, B. Najjari, A. Voitkiv, M. Gudmundsson, M. Grieser, R. Moshammer, J. Ullrich

Physics Faculty Research & Creative Works

Mutual projectile and target ionizations (MPTI) of 1MeV/amu N⁴⁺ and N⁵⁺ +He collisions have been studied in kinematically complete experiments; the data is presented in four-particle (4-D) Dalitz plots. comparison to eikonal approximation (EA) calculation results shows qualitatively good agreement.

Electron- And Proton-Impact Excitation In Stored Hydrogenlike Uranium Ions, A. Gumberidze, D. B. Thorn, S. Trotsenko, D. Banaś, H. Beyer, W. Chen, R. D. Dubois, S. Geyer, R. Grisenti, S. Hagmann, M. Hegewald, S. Hess, P. Indelicato, C. Kozhuharov

Physics Faculty Research & Creative Works

The projectile excitation of high-Z ions has been investigated in relativistic ion-atoms collisions by observing the subsequent x-ray emission. within this experiment information about the population of the magnetic sublevels has been obtained via an angular differential study of the decay photons associated with the subsequent de-excitation process. in addition, we have observed for the first time the effect of electron-impact excitation in a heavy highly charged ion undergoing a collision with a neutral atom.

Height Dependent Laser Metal Deposition Process Modeling, Patrick M. Sammons

Masters Theses

"Laser Metal Deposition (LMD) is used to construct functional parts in a layer-by-layer fashion. The heat transfer from the melt region to the solid region plays a critical role in the resulting material properties and part geometry. The heat transfer dynamics can change significantly as the layers increase, depending on the geometry of the sub layers. However, this effect is unaccounted for in previous analytical models, which are only valid for a single layer. This thesis develops a layer dependent model of the LMD process for the purpose of designing advanced layer-to-layer controllers. A lumped-parameter model of the melt pool …

A Planning Tool To Predict The Welding Angle In Laser Metal Deposition, Sriram Prabhu

Masters Theses

"Research in Laser Metal Deposition (LMD) has been done rigorously in the past. However, the main challenge that still exists is the production of complex part geometries having overhang features. Production of such features requires individual tracks with a high aspect ratio and wider bead angle. The use of destructible/ non-destructible support structures involves costly post production operations which increase production cost. Tilting or moving the deposition surface can be useful to create overhangs but are applicable only to special cases. Since such techniques have to be used by the manufacturing community, the techniques need to be simple in calculation …

Analysis Of Passive Louver Shading Systems And Impact On Interior Environment, Cory Joseph Brennan

Masters Theses

An installed passive louver shading systems can affect the heating, cooling, and lighting loads of any building, by altering the amount of solar energy, in the form of light and heat, from entering. The benefits of a louver system are derived from the application of solar geometry incident on the site and the climate within the area. By optimizing a passive louver system's design parameters, a building can reduce the total annual energy consumption due to artificial heating, cooling loads and artificial lighting. This research has implemented simulation modeling software, Energy Plus, to predict the effect of passive louver shades …

Breaking Internal Waves On A Shelf Slope Using Numerical Simulations, Subhas K. Venayagamoorthy, Oliver B. Fringer

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The subject of internal waves interacting with bottom topographic features in the ocean has received much attention in the past few decades. This heightened interest is mainly due to a conjecture that breaking internal waves at boundaries can be a significant source of turbulence, leading to mixing and transport in the ocean. In this paper, we present results from high-resolution three-dimensional numerical simulations of an internal wave interacting with a shelf break in a linearly stratified fluid in order to highlight the instabilities that contribute to wave breaking over topography. The results show the development of a nonlinear internal bolus …

Mantle Flow And Lithosphere-Asthenosphere Coupling Beneath The Southwestern Edge Of The North American Craton: Constraints From Shear-Wave Splitting Measurements, Hesham A. Refayee

Doctoral Dissertations

"High-quality broadband seismic data recorded by the USArray and other stations in the southwestern United States provide a unique opportunity to test different models of anisotropy-forming mechanisms in the vicinity of a cratonic edge. Systematic spatial variations of anisotropic characteristics are revealed by 3027 pairs of splitting parameters measured at 547 broadband seismic stations. The western and southern edges of the North American craton show edge-parallel fast directions with larger-than-normal splitting times, and the continental interior is characterized by smaller splitting times spatially consistent fast directions that are mostly parallel to the absolute plate motion direction of North America. Except …

Advanced Neural Networks And Their Applications In Smart Grids, Bipul Luitel

Doctoral Dissertations

"Today, neural networks (NN) are used in several system identification and nonlinear control system applications. However, their implementation on large systems has been limited either because of their degraded performance or the amount of time and computation required for implementing them being impractical for real applications. The primary emphasis of this research is on the development of advanced NN - simultaneous recurrent neural networks (SRN) and cellular neural networks (CNN); and methods for learning the complexity of large systems.

US electricity infrastructure is one of the largest and the most critical infrastructure consisting of thousands of generators connected by transmission …

Sustainability In The Plastics Industry: Concerns, Issues, And Strategies, Bonnie Bachman, Shristy Bashyal, Margaret Baumann

Economics Faculty Research & Creative Works

An increased corporate emphasis on sustainability can be seen in such areas as: annual reports with published sustainability goals, sustainability management systems with balanced scorecards and dashboards, websites using increased screen area and space for sustainability communications, internal and external stakeholder opinion gathering, development of sustainable supply chain plans, and marketing strategies focusing on green or sustainable consumers. To address this ever increasing attention to sustainability, a research project to understand sustainability in the plastics industry was initiated with the membership of the Society of Plastics Engineers (SPE). This paper focuses on the results of the research (global survey) and …

Trans-Boundary Movement Of Hazardous Waste: Evidence From A New Micro Data In The European Union, Mahelet G. Fikru

Economics Faculty Research & Creative Works

The paper explores a new micro dataset on the export of hazardous waste generated in Europe. A total of 16 745 industrial facilities generated hazardous waste in 2009 out of which 1 272 exported some or all of the waste. A measure of the export intensity of facilities is introduced by using export of hazardous waste as a percentage of total hazardous waste generated. The study finds that 96% of the export stays within Europe and rarely goes to developing countries. The major driving force behind firms' decision to export hazardous waste may be the stringency of general environmental policies …

2012 Scholarly Productivity Report, Missouri University Of Science And Technology

Civil, Architectural and Environmental Engineering Scholarly Productivity Reports

No abstract provided.

N-Acetyl-L-Cysteine Amide Protects Retinal Pigment Epithelium Against Methamphetamine-Induced Oxidative Stress, Nuran Ercal, Joshua W. Carey, Shakila Tobwala, Xinsheng Zhang, Atrayee Banerjee, Eylem Y. Pinarci, Humeyra Karacal

Chemistry Faculty Research & Creative Works

Methamphetamine (METH), a highly addictive drug used worldwide, induces oxidative stress in various animal organs. Recent animal studies indicate that methamphetamine also induces oxidative stress in the retina, which is an em- bryonic extension of the forebrain. The aim of this study, therefore, was to evaluate the pro- tecttive effects of N-acetylcysteine amide (NACA) against oxidative stress induced by METH in retinal pigment epithelium (RPE) cells. Our stud- ies showed that NACA protected against METH- induced oxidative stress in retinal pigment epithelial cells. Although METH significantly de- creased glutathione (GSH) levels and increased reactive oxygen species (ROS) and malondial- dehyde …

Noncanonical Reactions Of Flavoenzymes, Pablo Sobrado

Chemistry Faculty Research & Creative Works

Enzymes containing flavin cofactors are predominantly involved in redox reactions in numerous cellular processes where the protein environment modulates the chemical reactivity of the flavin to either transfer one or two electrons. Some flavoenzymes catalyze reactions with no net redox change. In these reactions, the protein environment modulates the reactivity of the flavin to perform novel chemistries. Recent mechanistic and structural data supporting novel flavin functionalities in reactions catalyzed by chorismate synthase, type II isopentenyl diphosphate isomerase, UDP-galactopyranose mutase, and alkyl-dihydroxyacetone phosphate synthase are presented in this review. In these enzymes, the flavin plays either a direct role in acid/base …

An Improved Prediction Model For Spacecraft Damage Following Orbital Debris Impact, Joel E. Williamsen, William P. Schonberg

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This paper offers a new set of 'generic', data-Based hole size and crank length prediction models for spherical orbital debris particles impacting multi-plate targets at velocities up to ~12 km/s. the equations are applicable to a wide variety of spacecraft target configurations, but are limited to hole sizes above, but relatively near, the ballistic limit of the impacting particles. Additional work is underway to expand these models to diameters farther above the ballistic limit for the described shield types.

Effects Of Nano-Copper(Ii) Oxide And Nano- Magnesium Oxide Particles On Activated Sludge, Guoqiang Liu, Jianmin Wang

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Effects of nano-copper (II) oxide (nano-CuO) and nano-magnesium oxide (nano-MgO) particles on activated sludge endogenous respiration (aerobic digestion), biochemical oxygen demand (BOD) biodegradation, and nitrification were investigated through respiration rate measurement. for comparison, the effects of Cu (II) and Mg (II) ions on activated sludge were also studied. Results indicated that soluble Cu (II) has half maximum inhibitory concentration (IC50) values of 19, 5.5, 53, and 117 mg Cu/L for endogenous respiration, BOD biodegradation, ammonium oxidation, and nitrite oxidation, respectively. However, nano-CuO only inhibited BOD biodegradation at 240 mg Cu/L or more, and its associated toxicity was primarily caused by …