Physical Sciences and Mathematics Commons^™

The Current Distribution On The Anode Surface Of The Seale Oval Tubular Lead Acid Battery, Renao Gu, Jianlin Yao, Zhengfa Deng, Ru Sun

Journal of Electrochemistry

The current distribution on anode surface of sealed lead acid batter under different discharge current and degree was studied by chemical analytical method for the first time. We can conclude that the current distribution is not even. The current density on the edge of the electrode surface and the electrode terminal are bigger than other areas, that is, there are edge effect and terminal effect, and these effect are more obvious when the discharge current is 100 A and degree is 100%.

Electrochemical Study And Application Of Cyclodextrin And Its Inclusion Complexes, Shuqin Liu, Zhimin Liu, Jinghao Pan

Journal of Electrochemistry

The electrochemical investigation and application of cyclodextrin and its inclusion complexes in recent years were reviewed. Studies on electrochemical behaviour of cyclodextrin inclusion complexes in our laboratory were introduced.

Comparison Of The Charge/Discharge Charasteristics Between Ni Cd And Ni Mh Battery And Its Improvement Of Manufacture Technique, Yumimg Wang

Journal of Electrochemistry

Based on the difference of charge discharge charasteristies between Ni Cd and Ni MH battery, some appropriate manufacture technoque to improve the battery performances or to extend its service life are adopted

Determination Of Organic Basis Of Hydrochloride By The Oscillopolarographic Titration, Yongfu Zhan, Zhaoren Meng, Guirong Zhao

Journal of Electrochemistry

In this paper, diphenhydramine hydrochloride, ephedrine hydrochloride, procaine hydrochloride, vitamin B 1 and vitamin B 6 have been determined by the Oscillopolarographic titration. This method has not been reported in any papers up to now. The characteristics of the method are being quick and exact, easy to observe the final result and saving material tested.

Studies Of Electrochemical Behaviors Of Cytochrome C On Pretreated Gold Electrodereceived 16 May, 1996, Jin Luo, Lingling Wu, Shaohua Huang, Zhonghua Lin

Journal of Electrochemistry

The quasi reversible responses of both adsorbed and bulk cytochrome c at the pretreated gold electrode are observed. The adsorption behaviors and reaction kinetics have been studied using in situ FTIR spectroscopy, UV/Vis reflection spectroscopy, voltammetry, AC impedance and potential step methods. The results show that the cytochrome c can irreversibly adsorb on the gold surface in a complete monolayer and the adsorbed layer can mediate the redox reaction of the cytochrome c in the solution in the absence of promoter.

Electrochemical Studies Of Cyanocobalamin On Silver Electrode, Zhai Jin, Yang Pin

Journal of Electrochemistry

The electrochemical characteristics of cyanocobalamin were separately studied on smooth and roughed silver electrode. It was found that the reduction of cyanocobalamin is two one electron steps on roughed silver but one two electron step on smooth electrode. The reason is due to the ability of absorption of the surface of electrode.

Surface Modifications Of Carbon Materials Used As Anode Of Lithium Ion Battery Ⅰ.Influences Of Oxidation And Reduction Pretreatment On Anode Performance, Shuhua Ma, Hanju Guo, Ji Li, Hongze Liang, Xiabin Jing, Fosong Wang

Journal of Electrochemistry

The influences of the trace oxygen containing functional groups on surface of carbon material on cell performance of carbon anode for lithium ion batteries were studied by means of the pretreament in various oxidant/reductant systems.The results showed that the rich oxygen containing functional groups impaired the cell performance of carbon material anode,and the reduction of these groups in quantity and oxidation degree can increase charge/discharge capacity and improve first charge/discharge efficiency.The reason was also discussed in the light of effects of surface organic groups on decomposition reactivity of electrolyte and formation process of surface passivating film.

High Active Platinum Plated Titanium Electrode, Xiufeng Xiao, Zeshan Zhu

Journal of Electrochemistry

To prepare the adherent and high active platinum plated titanium electrode, ultrasonic agitation technology and the best conditions of electrodeposition were adopted. Ultrasonic agitation technology can be improved the cohesion between coatings and substrate. The activity of electrode has related to the double layer Capacity of electrode, which was due to the electrode rugosity.

Study Of Electrochemistry Of Octa Butyl 2, 3 Naphthalocyanine Manganese(Ⅲ) In Nonaqeous Solvents, Suling Yang, Ersheng Liu, Naisheng Chen, Jinling Huang

Journal of Electrochemistry

The electrochemical behavior of 5,9,14,18,23,27,32,36 Octa Butyl 2,3 Naphalocyanine Manganese (Ⅲ) [(BuO) 8NPcMn(Ⅲ)Cl] in four nonaqueous solvents was studied by means of cyclic voltammetry, and the corresponding half wave potentials (E 1/2 ) of redox reactions were obtained. Four (or five) pairs of redox peaks were assigned. The solvent effect on the electrochemical characteristics of this coordination compound was also discussed preliminarily, and the electrochemical behavior of the complex was compared with that of nonsubstitued naphthalocyanine.

Investigating The Evolution Of Multifragmenting Systems With Fragment Emission Order, E. W. Cornell, T. M. Hamilton, D. Fox, Y. Lou, R. T. De Souza, M. J. Huang, W. C. Hsi, C. Schwarz, C. Williams, D. R. Bowman, J. Dinius, C. K. Gelbke, D. O. Handzy, M. A. Lisa, W. G. Lynch, Graham F. Peaslee, L. Phair, M. B. Tsang, G. Vanburen, R. J. Charity, L. G. Sobotka, W. A. Friedman

Faculty Publications

Multifragment decays of central collisions in 84Kr+197Au at E/A=70MeV are studied. By utilizing a technique sensitive to the emission order of fragments, it is deduced that carbon fragments are emitted prior to beryllium fragments when these fragments have the same velocity. This observation is consistent with the cooling of a thermally decaying source.

Reactions Of Singlet Oxygen And Singlet Oxygen Mimics With Dicyclopropylethylenes: Comparison Of Reactivity And Mechanisms, Gina Elizabeth Alume

FIU Electronic Theses and Dissertations

An extensive study of the reaction pathways of 1,1- dicyclopropyl ethylene, cis- and trans- 1,2-dicyclopropylethylenes has been undertaken with different electrophiles 4-methyl-1,2,4- triazoline-3,5-dione (MTAD), tetracyanoethylene (TCNE), and singlet oxygen (10₂). Comparison of reactivity and reaction mechanisms among the electrophiles is investigated. Singlet oxygen exhibits significantly lower reactivity compared to the other electrophiles. MTAD and TCNE react with dicyclopropylethylenes to produce predominantly "2+2" adducts and a small amount of the "ene" adducts. The "2+2" is the major product presumably because of the high activation energy leading to the highly strained "ene" products. Solvent trapping studies provide strong evidence of …

Far-Field Scattering Of A Non-Gaussian Off-Axis Axisymmetric Laser Beam By A Spherical Particle, James A. Lock, Joseph T. Hodges

Physics Faculty Publications

Experimental laser beam profiles often deviate somewhat from the ideal Gaussian shape of the axisymmetric TEM(00) laser mode. To take these deviations into account when calculating light scattering of an off-axis beam by a spherical particle, we use our phase-modeling method to approximate the beam-shape coefficients in the partial wave expansion of an experimental laser beam. We then use these beam-shape coefficients to compute the near-forward direction scattering of the off-axis beam by the particle. Our results are compared with laboratory data, and we give a physical interpretation of the various features observed in the angular scattering patterns. (C) 1996 …

Synthesis And Characterization Of Novel Sf5 Containing Fluoroalkyl Iodides And Derivatives, Julia Anne Renn

Dissertations and Theses

Preparation of four SF5-containing fluoroalkyl iodides and derivatives thereof was accomplished beginning with a simplified synthesis of ICF2CF2I. Characterization of the products followed using a variety of spectroscopic and physical methods. The simplified method for preparing ICF2CF2I from iodine and tetrafluoroethylene (TFE) involved a reaction temperature of approximately 54°C and pressures of less than two atmospheres for the TFE. The synthesized ICF2CF2I was reacted with S2F1o and tetrafluoroethylene to give SF5CF2CF2I. The subsequent synthesis of the SFs containing fluoroalkyl iodides and derivatives were carried out using SFsCF2CF2I as the starting material in a Carius tube reaction vessel. The synthesized SFs …

The Application Of A Multimedia System To The Tourist Guide Of The Miami International Airport, Ying-Yuang Chen

FIU Electronic Theses and Dissertations

This project is to present a multimedia system designed for Miami International Airport as a tourist guide for passengers and to demonstrate the functionalities and facilities of the airport.

The project is based on an inexpensive integrated and comprehensive multimedia environment. The major components of the environment consist of (1) a low cost PC 386/486 with only ISA bus and IDE hard drive, (2) a high quality and high performance add-on real-time video/audio codec board (30/25 fps for NTSC/PAL video and synchronized audio sampled at 22KHz), (3) software packages including interactive utility programs to record, playback and edit real-time video/audio …

Nanoscale Investigation Of Fatigue Effects In Pb(Zr,Ti)O3 Films, Alexei Gruverman, O. Auciello, H. Tokumoto

Alexei Gruverman Publications

Scanning force microscopy has been used to perform a comparative nanoscale study of domain structures and switching behavior of Pb(Zr_xTi_1-x)O₃ (PZT) thin films integrated into heterostructures with different electrodes. The study revealed a significant difference between polarization state of as-deposited PZT films on RuO₂ and Pt electrodes. The PZT/RuO₂ films exhibit polydomain crystallites and show almost symmetric switching behavior, while the PZT/Pt films are mainly in a single polarity state and exhibit highly asymmetric piezoelectric hysteresis loops. Formation of unswitchable polarization within the grains of submicron size as a result of fatigue process …

Macrophage-Mediated 15-Lipoxygenase Expression Protects Against Atherosclerosis Development, Jianhe Shen, Ed Herderick, J. Fredrick Cornhill, Eva Zsigmond, Han Seob Kim, Hartmut Kühn, Natalia V. Guevara, Lawrence Chan

Physics and Astronomy Faculty Publications and Presentations

Oxidative modification of LDL increases its atherogenicity, and 15- lipoxygenase (15-LO) has been implicated in the process. To address this issue, we generated transgenic rabbits that expressed 15-LO in a macrophage- specific manner and studied their susceptibility to atherosclerosis development when they were fed a high-fat, high-cholesterol (HFHC) diet (Teklad 0533 rabbit diet 7009 with 10% corn oil and 0.25% cholesterol) for 13.5 wk. Transgenic and nontransgenic rabbits developed similar degrees of hypercholesterolemia and had similar levels of triglyceride, VLDL, LDL, and HDL. Quantitative morphometric analysis of the aortic atherosclerosis indicated that the transgenic animals (n = 19) had significantly …

Photoionization Of Atoms, Anthony F. Starace

Anthony F. Starace Publications

This chapter outlines the theory of atomic photoionization, and the dynamics of the photon-atom collision process. Those kinds of electron correlation that are most important in photoionization are emphasized, although many qualitative features can be understood within a central field model. The particle-hole type of electron correlations are discussed, as they are by far the most important for describing the single photoionization of atoms near ionization thresholds. Detailed reviews of atomic photoionization are presented in Refs. [I] and 121. Current activities and interests are well-described in two recent books [3,4]

Geometrical Folding Transitions Of The Triangular Lattice In The Face-Centred Cubic Lattice, Mark Bowick, Oliver Golinelli, Emmanuel Guitter, S. Mori

Physics - All Scholarship

We study the folding of the regular two-dimensional triangular lattice embedded in the regular three-dimensional Face-Centred Cubic lattice, a discrete model for the crumpling of membranes. Possible folds are complete planar folds, folds with the angle of a regular tetrahedron (71 degrees) or with that of a regular octahedron (109 degrees). We study this model in the presence of a negative bending rigidity K, which favours the folding process. We use both a cluster variation method (CVM) approximation and a transfer matrix approach. The system is shown to undergo two separate geometrical transitions with increasing |K|: a first discontinuous transition …

Potentials With Two Shifted Sets Of Equally Spaced Eigenvalues And Their Calogero Spectrum, Asim Gangopadhyaya, Uday P. Sukhatme

Physics: Faculty Publications and Other Works

Motivated by the concept of shape invariance in supersymmetric quantum mechanics, we obtain potentials whose spectrum consists of two shifted sets of equally spaced energy levels. These potentials are similar to the Calogero-Sutherland model except the singular term αx−2 always falls in the transition region -1/4 < a < 3/4 and there is a δ-function singularity at x=0.

Prairie Legacies - Mammals, Russell A. Benedict, Patricia W. Freeman, Hugh H. Genoways

School of Natural Resources: Faculty Publications

Few North American ecosystems have been as dramatically altered by humans as the prairies of the Great Plains. Occupying the immense interior of North America, these deceiving grassland oceans hid their complexity and diversity from many early travelers who saw this area merely as an obstacle to overcome in their westward journeys. But for the careful observer, prairies hold a tremendous quantity of life, arranged in a diverse mosaic of patches ranging in scale from minute anthills to the vastness of the Nebraska Sandhills or Kansas Flint Hills. Not only is a given ridgetop subdivided into a number of areas …

Asymptotic Conservation Laws In Field Theory, Ian M. Anderson, Charles G. Torre

All Physics Faculty Publications

A new, general, field theoretic approach to the derivation of asymptotic conservation laws is presented. In this approach asymptotic conservation laws are constructed directly from the field equations according to a universal prescription which does not rely upon the existence of Noether identities or any Lagrangian or Hamiltonian formalisms. The resulting general expressions of the conservation laws enjoy important invariance properties and synthesize all known asymptotic conservation laws, such as the Arnowitt-Deser-Misner energy in general relativity.

Master Of Science In Computing Technology In Education 1996, Nova Southeastern University

College of Engineering and Computing Course Catalogs

No abstract provided.

Protein-Protein And Protein-Dna Interactions At The Bacteriophage T4 Dna Replication Fork. Characterization Of A Fluorescently Labeled Dna Polymerase Sliding Clamp, Daniel J. Sexton, Theodore E. Carver, Anthony J. Berdis, Stephen J. Benkovic

Chemistry Faculty Publications

The T4 DNA polymerase holoenzyme is composed of the polymerase enzyme complexed to the sliding clamp (the 45 protein), which is loaded onto DNA by an ATP-dependent clamp loader (the 44/62 complex). This paper describes a new method to directly investigate the mechanism of holoenzyme assembly using a fluorescently labeled cysteine mutant of the 45 protein. This protein possessed unaltered function yet produced substantial changes in probe fluorescence intensity upon interacting with other components of the holoenzyme. These fluorescence changes provide insight into the role of ATP hydrolysis in holoenzyme assembly. Using either ATP or the non-hydrolyzable ATP analog, adenosine …

Effects Of The Cardioprotective Drugs Dexrazoxane And Adr-925 On Doxorubicin Induced Ca2+-Release From The Sarcoplasmic Reticulum, Thomas Andreas Herzinger

Dissertations and Theses

The sarcoplasmic reticulum is the intramuscular organelle responsible for the regulation of cytoplasmic calcium levels in muscle. This thesis investigates the effects of the cardioprotective drug, dexrazoxane, and its metabolite ADR-925 on doxorubicin induced calcium release from skeletal sarcoplasmic reticulum. Doxorubicin is a widely used antineoplastic agent. One of the major side effects of doxorubicin usage is chronic cardiotoxicity. Doxorubicin is a potent activator of the calcium release mechanism from the SR. The interaction between doxorubicin and the calcium release channel has been proposed as the possible underlying mechanism behind cardiotoxicity. A short overview of different hypotheses describing doxorubicin induced …

Laboratory Synthesis Of Molecular Hydrogen On Surfaces Of Astrophysical Interest, Gianfranco Vidali, V Pirronello, Chi Liu, Liyong Shen

Physics - All Scholarship

We report on the first results of experiments to measure the recombination rate of hydrogen on surfaces of astrophysical interest. Our measurements give lower values for the recombination efficiency (sticking probability S x probability of recombination upon H-H encounter \gamma) than model-based estimates. We propose that our results can be reconciled with average estimates of the recombination rate (1/2 n(H) n(g) v(H)A S \gamma) from astronomical observations, if the actual surface of an average grain is rougher, and its area bigger, than the one considered in models.

Re-Engineering Technical Education In Industry Through Interactive Multimedia Computer-Based Training, Yolanda Kennedy, Erika Rogers

Computer Science and Software Engineering

This paper describes current work on re-engineering a short technical course in the area of Non-Destructive Evaluation/Inspection (NDE/I) sponsored by Boeing’s Defense and Space Group. The subject of the course is Eddy Current Testing, and is currently taught over a period of two days using traditional view foils and hand-built artifacts. An overview of some of the course material is presented together with how techniques such as task analysis and storyboarding are being used to design interactive multimedia training modules to support this course.

Interactive Student Support For Introductory Computer Science Courses, Barb Ericson, Erika Rogers

Computer Science and Software Engineering

This paper describes the development of interactive multimedia modules which provide supplementary tutorials on basic topics covered in introductory computer science classes. Two such modules were implemented on the topics of number conversions and basic operating system information. The first versions of the tutorials were evaluated in a study using protocol collection and a post-test with a number of student participants. Results from this study led to the re-design of several portions of the tutorials, which now have a greater level of interaction and progressive assistance for problem-solving.

The Dark Side Of Risk (What Your Mother Never Told You About Time Warp), David M. Nicol, Xiaowen Liu

Computer Science Technical Reports

This paper is a reminder of the danger of allowing ``risk'' when synchronizing a parallel discrete-event simulation: a simulation code that runs correctly on a serial machine may, when run in parallel, fail catastrophically. This can happen when Time Warp presents an ``inconsistent'' message to an LP, a message that makes absolutely no sense given the LP's state. Failure may result if the simulation modeler did not anticipate the possibility of this inconsistency. While the problem is not new, there has been little discussion of how to deal with it; furthermore the problem may not be evident to new users …

Mp731: New England Killing Frost Records By Zone, William R. Baron, David C. Smith

Miscellaneous Publications

This publication provides a deeper look at the killing frost data that is analyzed and summarized in Maine Agricultural and Forest Experiment Station Bulletin 846. The presentation in Bulletin 846 is designed to help planners and analysts. Individual readers, historians, botanists, agronomists, ecologists, and others may find a deeper look at the materials useful. Miscellaneous Publication 731 provides those data by climate zone on a yearly basis.

Tb162: Red Maple And White Pine Litter Quality: Initial Changes With Decomposition, Mairin T. Delaney, Ivan J. Fernandez, Jeffrey A. Simmons, Russel D. Briggs

Technical Bulletins

The specific objectives of this study were (a) to define the organic and inorganic composition of foliar litter from red maple (Acer rubrum L.) and white pine (Pinus strobus L.), and (b) to determine the shifts in the organic and inorganic composition of these two litter types during the initial stages of decomposition. These two species were chosen because of their prominence in the northeastern U.S. and the contrast they afforded in litter quality characteristics which have a strong influence on litter decomposition.