Physical Sciences and Mathematics Commons^™

Electrochemical Properties Of The Modified Carbon Nanotubes, Chun-An Ma

Journal of Electrochemistry

Powder micro-electrodes were prepared from raw carbon nanotubes and carbon nanotubes modified by carboxyl.The electro-reduction properties of both the raw and open-ended carbon nanotubes in p-Nitrophenol solution were investigated.The FTIR spectrum result indicated that the functional groups are successfully fixed on the surface of the carbon nanotubes after nitric acid treatment.The cyclic voltammetry results show that the electrochemical activity of carboxyl-modified carbon nanotubes was improved.The mechanism of electro-(reduction) for the carbon nanotubes after acid treatment was discussed.

Studies And Applications Of Phosphoric Acid Treatment On Low Voltage Formed Aluminum Foils, Lan Sun, Hui-Rong Qiu, Hui-Zhong Tan, Xue-Yan Chen, Chang-Jian Lin

Journal of Electrochemistry

The surface of low voltage formed foil for Al electrolysis capacitors is treated with phosphoric acid solution.The effects of concentration of phosphoric acid solution,temperature and process time on specific capacitance and the time of hydration resistance with standing voltage are studied.The optimum condition is presented.The properties of low voltage formed foil have been improved by applying this method on the product line.

A Parallel Unmixing Algorithm For Hyperspectral Images, Stefan A. Robila, Lukasz G. Maciak

Department of Computer Science Faculty Scholarship and Creative Works

We present a new algorithm for feature extraction in hyperspectral images based on source separation and parallel computing. In source separation, given a linear mixture of sources, the goal is to recover the components by producing an unmixing matrix. In hyperspectral imagery, the mixing transform and the separated components can be associated with endmembers and their abundances. Source separation based methods have been employed for target detection and classification of hyperspectral images. However, these methods usually involve restrictive conditions on the nature of the results such as orthogonality (in Principal Component Analysis - PCA and Orthogonal Subspace Projection - OSP) …

Interview With Brian Croak, Croak Creations, 2006 (Audio), Brian Croak

All Sustainability History Project Oral Histories

Interview of Brian Croak by Chloe Collins on November 28th, 2006.

The interview index is available for download.

Interview With Dell M. Turner, Green Roofing Contractor, 2006 (Audio), Dell M. Turner

All Sustainability History Project Oral Histories

Interview of Dell M. Turner by Padraic Keene at Portland State University on November 28th, 2006.

The interview index is available for download.

Stm Tip-Induced Nanostructuring-Replacement Method To Construct Pt Surface Nanostructures, Jin-Gang Wang, Jing Tang, Zhao-Bin Chen, Bing-Wei Mao

Journal of Electrochemistry

STM tip-induced surface nanostructuring based on "Jump-to-contact" mechanism is a nanostructuring technique that has the highest resolution in aqueous solutions.However,for metals that have high cohesive energy,atoms would transfer from surface to tip instead,which limits the wide application of this technique.In this paper,we present a two-step Nanostructuring-Replacement method to construct metal nanoclusters that cannot be obtained directly via the "Jump-to-contact" mechanism.The method is demonstrated to construct Pt nanoclusters that are of great interest in catalysis and electrocatalysis but cannot be constructed via the "Jump-to-contact" mechanism.Since Cu is the most intensively studied and successful system in the tip-induced nanostructuring,it is utilized as …

Reaction Mechanism Of V(Ⅳ)/V(Ⅴ) Redox Couple At Graphite Felt Composite Electrode Bonded With Conductive Carbon Plastic, Xiao-Gang Li, Ke-Long Huang, Su-Qin Liu, Ning Tan, Li-Quan Chen

Journal of Electrochemistry

The rate-determining step of V(Ⅳ) /V(Ⅴ) redoxreaction was investigated at graphite felt(GF)composite electrode by various techniques: cyclic voltammetry,polarization curve and impedance spectroscopy.Cyclic voltammetry analysis indicated that V(Ⅳ) /V(Ⅴ) redox reaction at GF electrode is quasi reversible.Acertain chemical reaction step is suspected to follow the electron transfer step of this reaction.The Tafel slopevalue(0.124) obtained from the polarization curve agrees well with theoretical value(0.12),which supposingthe electron transfer step was the rate-determining step.Impedance Spectroscopies at various potentials werestudied and simulated by equivalentcircuits.The impedance value of the electron transfer step modified is greatlyhigher than the others,which shows that the electron transfer step is the …

The Synthesis, Structure And Electrochemical Performances Of Lithium Iron Phosphate, Hui Xie, Zhen-Tao Zhou

Journal of Electrochemistry

The lithium iron phosphate cathode materials were synthesized by solid-state reaction combined high-rate ball milling under the temperature ranging from 400 ℃ to 700 ℃.The crystalline structure, morphology of particles, and electrochemical performance of the sample were investigated by X-ray diffraction, scanning electron microscopy and charge-discharge test. The results showed that the sintering temperature had great influences on the crystal structure, morphology and electrochemical performances of LiFePO₄. The sample synthesized under 600℃ showed the best charge-discharge performances with the first specific discharge capacity of(128.8) mAh/g and the 15^th specific discharge capacity of 129.1 mAh/g at 0.1C rate, …

Structure And Electrochemical Characteristics Of Lifepo4 Prepared By The Polyacrylates-Pyrolysis-Reduction Method For Li-Ion Batteries, Li-Hong Yu, Yu-Liang Cao, Xiao-Fei Zhang, Han-Xi Yang, Xin-Ping Ai

Journal of Electrochemistry

The cathode material of olivine LiFePO₄ was prepared by a novel method of polyacrylate-pyrolysis-reduction.XRD demonstrates that the material have the olivine structure.SEM photo shows an average particle-size of about 100 nm with a well distribution.Electrochemical test of cycling at a constant current reveals the discharge capacity of 138 mAh/g and a good cycling stability.It is a novel practicable technology to prepare LiFePO₄ by using polyacrylate-pyrolysis-reduction method.

Interview With Chelsea Cochran, Walker Macy, 2006 (Audio), Chelsea Cochran

All Sustainability History Project Oral Histories

Interview of Chelsea Cochran by Cory Angell at Walker Macy, Portland Oregon on November 27th, 2006.

The interview index is available for download.

Object-Oriented Design Of An Automated Calibration System For An Analog I/O Process Control Device, Craig N. Rogers

Regis University Student Publications (comprehensive collection)

The goal of this project was to deliver the design of object-oriented software for the control of a custom calibration/test system. This calibration/test system is to be used for the production testing and calibration of an Analog Input device used in a process control system. Software features include a GUI (Graphical User Interface), Analog Input device troubleshooting tools, calibration/test system calibration and troubleshooting tools, and report printing capability. This project followed the methodology defined by the Unified Process Model and delivered design documentation through the Inception and Elaboration phases. This paper discusses the planning, documentation and testing differences between a …

Synthesis Of Indolizines And Benzoindolizines By Annulation Of Donor-Acceptor Cyclopropanes With Electron-Deficient Pyridines And Quinolines, Nicholas A. Morra, Christian L. Morales, Barbora Bajtos, Xin Wang, Hyosook Jang, Jian Wang, Brian Pagenkopf

Chemistry Publications

The formal [3+2] dipolar cycloaddition (or annulation) of donor-acceptor cyclopropanoate esters with pyridines and 5-nitroquinoline is reported. Electron-deficient pyridine dipolarophiles (R=CN, CO₂Et, COMe) participate in the annulation whereas electron rich species do not. The product 2,3-dihydroindolizines undergo rapid autooxidation, and the X-ray structures for two of the aromatic products are reported.

Multiwalled Ice Helixes And Ice Nanotubes, Jaeil Bai, Jun Wang, Xiao Cheng Zeng

Xiao Cheng Zeng Publications

We report six phases of high-density nano-ice predicted to form within carbon nanotubes (CNTs) at high pressure. High-density nano-ice self-assembled within smaller-diameter CNT (17,0) exhibits a double-walled helical structure where the outer wall consists of four double- stranded helixes, which resemble a DNA double helix, and the inner wall is a quadruple-stranded helix. Four other double-walled nano-ices, self-assembled respectively in two larger-diameter CNTs (20,0 and 22,0), display tubular structure. Within CNT (24,0), the confined water can freeze spontaneously into a triple-walled helical nanoice where the outer wall is an 18-stranded helix and the middle and inner walls are hextuple-stranded helixes.

The All Boron Carbide Diode Neutron Detector: Comparison With Theory, A. N. Caruso, Peter A. Dowben, S. Balkir, Nathan Schemm, Kevin Osberg, R.W. Fairchild, Oscar Barrios Flores, Snjezana Balaz, A.D. Harken, Brian W. Robertson, Jennifer I. Brand

Peter Dowben Publications

A boron carbide diode detector, fabricated from two different polytypes of semiconducting boron carbide, will detect neutrons in reasonable agreement with theory. Small deviations from the model calculations occur due to the detection efficiencies of the ¹⁰B capture products Li plus α sum signal differing somewhat from expectation in the thin diodes. The performance of the all boron carbide neutron detector does depart from the behavior of devices where a boron rich neutron capture layer is distinct from the diode charge collection region (i.e. a conversion layer solid state detector), as is expected.

Energetics Of Oxaspirocycle Prototypes: 1,7-Dioxaspiro[5.5]Undecane And 1,7,9-Trioxadispiro[5.1.5.3]Hexadecane, Abby Jones Weldon, Gregory S. Tschumper

Chemistry Faculty Research & Creative Works

(Chemical Equation Presented) The relative gas-phase energetics of several low-lying isomers of 1,7-dioxaspiro[5.5]undecane and 1,7,9-trioxadispiro[5.1.5. 3]hexadecane have been calculated with second-order Møller-Plesset perturbation theory and basis sets as large as aug-cc-pVQZ. Relative energies in THF, dichloromethane, acetone, and DMSO have been estimated with corrections from polarized continuum model calculations at the B3LYP/6-311+G(d) level. In the most stable conformation of 1,7-dioxaspiro[5.5]undecane, both rings adopt chair conformations, and both oxygens are axially disposed (2A). It is more than 2 kcal mol^-1 more stable than all the other conformers. In agreement with previous work, the "twist-boat" trans isomer (3A) is the most …

Fluorescence Blinking Statistics From Cdse Core And Core/Shell Nanorods, S. Wang, C. Querner, Thomas B. Emmons , '08, M. Drndic, Catherine Hirshfeld Crouch

Physics & Astronomy Faculty Works

We report fluorescence blinking statistics measured from single CdSe nanorods (NRs) of seven different sizes with aspect ratios ranging from 3 to 11. This study also included core/shell CdSe/ZnSe NRs and core NRs with two different surface ligands producing different degrees of surface passivation. We compare the findings for NRs to our measurements of blinking statistics from spherical CdSe core and CdSe/ZnS core/shell nanocrystals (NCs). We find that, for both NRs and spherical NCs, the off-time probability distributions are well described by a power law, while the on-time probability distributions are best described by a truncated power law, P(tau(on)) similar …

Properties Of Some Matrix Classes In Linear Complementarity Theory., Arup Kumar Das Dr.

Doctoral Theses

The linear complementarity problem is a fundamental problem that arises in optimization, game theory, economics, and engineering. It can be stated as follows:Given a square matrix A of order n with real entries and an n dimensional vector q, find n dimensional vectors w and z satisfying w − Az = q, w ≥ 0, z ≥ 0 (1.1.1) w t z = 0. (1.1.2)This problem is denoted as LCP(q, A). The name comes from the condition (1.1.2), the complementarity condition which requires that at least one variable in the pair (wj , zj ) should be equal to 0 …

Kfgc Forage Spokesman Contest, Todd A. Clark, Farms, Inc., Robey Farms

Kentucky Grazing Conference

No abstract provided.

New Options For Extending Grazing, Edward N. Ballard

Kentucky Grazing Conference

Feed costs represent the major cost in most livestock production systems. A recently completed analysis of 225 Standardized Performance Analysis (SPA) Beef Cow Records on herds in Illinois and Iowa showed that feed cost was the overriding factor determining profitability, explaining over 57 percent of the herd-to-herd variation.

Dollars & Cents Of Intensive Grazing, Kenneth H. Burdine

Kentucky Grazing Conference

A rotational grazing system can generally be defined as the use of several pastures with one being grazed while the others are rested. On the contrary, conventional or continuous grazing systems allow livestock access to the entire pasture area and let them decide where, what, and how long to graze. In most cases, Kentucky pastures employing continuous grazing systems are too large for efficient management and forage utilization. In such instances, cattle overgraze more palatable forages and areas close to shade and water, while other sections of the pasture are underutilized. This leads to lower animal output per acre than …

Uk Horse Pasture Evaluation Program, Tom Keene, S. Ray Smith

Kentucky Grazing Conference

The University of Kentucky is developing stronger ties with the state’s horse industry in the areas of research, extension and teaching. Many horse farms in the bluegrass region are interested in UK’s assistance with pasture evaluation. During the fall of 2005 a team from the UK Forage Extension Program (Ray Smith, Tom Keene, Jesse Morrison, Gabriel Roberts) conducted a pilot project to evaluate horse pastures on 14 central KY farms. One of the focuses of the pilot was the evaluation of pastures for percent tall fescue and the potential of fescue stands to cause fescue toxicity in pregnant broodmares. We …

Managing Pasture Growth And Quality With Grazing, S. Ray Smith

Kentucky Grazing Conference

One of the keys to profitable livestock production is to minimize the costs of producing a marketable animal or animal product. Feed costs are commonly 70-80 percent of the cost of growing or maintaining an animal. Pastures provide feed at a cost of .01-.02 cents/lb of TDN while hay costs .04-.06 cents/lb TDN. Improved pasture management offers the single greatest opportunity to lower production costs, assuming that animal genetics, health, marketing procedures, and other areas of management have been addressed. A primary goal of livestock producers should be to utilize grazed forage for as many months of the year as …

Everyday Cattle Graze Is Money Saved, Garry D. Lacefield

Kentucky Grazing Conference

During one of my first visits to New Zealand over twenty years ago, I had the opportunity to visit many different dairy, beef, sheep and deer farms. While visiting a dairy farm, I remember the farmer telling me about his grazing program and their goal to “optimize grazing and minimize stored feed.” I remember him saying, “everyday grazed is money saved”. I admit, the reality of that statement didn’t truly sink in that day; but over the years, the truth of what he said has not only “sunk in” but has been reinforced by visits to other farms literally around …

Bermudagrass In Kentucky, David C. Ditsch

Kentucky Grazing Conference

Interest in bermudagrass [Cynodon dactylon (L.) Pers] is increasing in Kentucky as livestock producers continue their search for warm-season perennial forages capable of filling in the mid-summer growth slump we commonly experience with our traditional cool-season grasses. This is partially due to the recent availability of seeded bermudagrass varieties with improved winter hardiness thereby reducing establishment cost and increasing the odds of success.

Grazing Corn, Chad Lee

Kentucky Grazing Conference

Grazing is the cheapest form of feed for cattle. While perennial grasses and alfalfa are reliable components to a grazing system, another component could be corn.

Grazing corn is an option for a couple of situations: 1) as a bridge crop when pasture renovation is needed, and 2) as an insurance crop in an overall grazing system.

Forages On The Web, Scott Flynn

Kentucky Grazing Conference

No abstract provided.

Foreword And Kfgc Award Winners [2006], Garry D. Lacefield, Christi L. Forsythe

Kentucky Grazing Conference

No abstract provided.

Bear River Watershed Historical Digital Collection, Cheryl D. Walters, Stephen C. Strugeon

Library Faculty & Staff Publications

This presentation to the Bear River Water Commission introduced a new digital collection of images and text resources about the Bear River Watershed in Utah and Idaho.

Petrogenesis Of Eocene-Oligocene Magmatism Of The Sulphur Springs Range, Central Nevada: The Role Of Magma Mixing, Elizabeth Balls Ryskamp

Theses and Dissertations

Widespread base- and precious-metal anomalies, altered porphyry intrusions and oxidized veins occur in a portion of the Sulphur Springs Range, Nevada (adjacent to the Au-producing Carlin Trend). Some of the Eocene-Oligocene intrusions and cogenetic volcanic rocks in the range exhibit evidence of magma mixing and invite comparisons with other mineralized, Eocene mixed magma systems like the Bingham porphyry Cu deposit 300 km farther to the east. The Sulphur Springs igneous suite ranges compositionally through rhyolite, dacite, andesite and basaltic andesite but is less alkaline than the Bingham volcanic suite. However, the alkali content of the Sulphur Springs suite is similar …

Rovibrational Resonance Effects In Collision-Induced Electronic Energy Transfer: I2(E,V=0-2)+Cf4, J. M. Hutchison, Benjamin Robert Booth Carlisle , '05, Thomas Alex Stephenson

Chemistry & Biochemistry Faculty Works

Collisions of I-2 in the E(0(g)(+)) electronic state with CF4 molecules induce electronic energy transfer to the nearby D, beta, and D-' ion-pair states. Simulations of dispersed fluorescence spectra reveal collision-induced electronic energy transfer rate constants and final vibrational state distributions within each final electronic state. In comparison with earlier reports on I-2(upsilon(E)=0-2) collisions with He or Ar atoms, we find markedly different dynamics when I-2, excited to the same rovibronic states, collides with CF4. Final vibrational state distributions agree with the associated Franck-Condon factors with the initially prepared state to a greater degree than those found with He or …