Physical Sciences and Mathematics Commons^™

Corrosion Characteristics Of Electrodeposited Ni Mo P Alloy Immersed In Nacl Solution, Yue Zeng, Hongxin Huang, Xiaoming Xiao, Shixun Lian

Journal of Electrochemistry

The corrosion characteristics of electrodeposited Ni Mo P alloy immersed in 5wt.% NaCl solution were investigated using immersion, anodic polarization curves, XPS and AES analysis. The corrosion rates of amorphous Ni Mo P alloys are lower than that of crystalline Ni Mo P alloys. Anodic polarization curve experiments show that for the electrodeposited Ni Mo P alloys, the nickel mol fraction of which has in between 0.719 and 0.868, the corrosion potential moves to positive with the increase of P content, and the peak current value of active region increase with the increase of Mo content in alloys, though the …

Studies On The Inclusion Behavior Of Cyclodextrins With Ketoprofen By Electrochemical Methods, Jun Gu, Yong Zhang, Jinhao Pan

Journal of Electrochemistry

The influences of cyclodextrins and their derivatives on the electrochemical behavior of ketoprofen were studied. The inclusion constants of ketoprofen with β CD,HP β CD and methyl β CD and the influences of temperature on the inclusion actions were also investigated. The inclusion phenomena is explained with the thermodynamics parameters of the inclusion complexes.

The Study Of Poly [N (3 Ferrocene Acetamino Propyl Pyrrole] Film Modified Glucose Electrode, Chengyun Tian, Jing Chen, Li Zhang

Journal of Electrochemistry

A poly [N (3 ferrocene acetamino propyl pyrrole)]film modified electrode was fabricated and studied by cyclic voltammetric method. The result shows that the modified electrode can give stable redox peaks of ferrocene, and an obvious catalytic peak due to glucose; This modified electrode was used to tabricate a glucose sensor which operates at +0.2 V, so that the ascorbic acid or uric acid doesn't affect the accuracy detection of glucose concentration. The sensor has a linear range of 0.1～10 mmol/L glucose, which the period of long term stability and response time of the sensor are about ten days and 2 …

The Latest World Wide Progress In Solid Oxide Fuel Cell, Jiang Yi

Journal of Electrochemistry

Solid oxide fuel cell(SOFC) is a novel, green electricity generation technology, which has been showing rapid development since 1980's. In light of its high efficiency, environmental friendly, fuel adaptability and long term stability, the Research, Development and Demonstration(RD&D) of this hype of full cell have been emphasized in a large number of developed countries. Based on the information communicated at the latest symposium on SOFC held last year in Aachen(Germany) and the knowledge gained through years of research in this field, a comprehensive review on the latest development of the tubular, this planar SOFC as well as on a number …

Oxygen Evolution Behavour On Ni Electrode In Koh Solution, Xiaoyan Cao, Huatang Yuan, Zuoxiang Zhang Yunshi Zhou

Journal of Electrochemistry

The steady_state polarization curves of oxygen evolution were measured at temperatures between 22～70 ℃ on Ni electrode in 30 wt.% KOH solution by galvanostat methode. The exchange current densities, Tafel slopes and transfer coefficients were studied. It was found that 40 ℃ is a special temperature, near which the kinetic parameters change abrupdy. The Tafel slopes for oxygen evolution reactions at higher overpotentials change from more than 120 mV to about 70 mV when the temperature raises to 40～70 ℃ from 22～35 ℃. Simultaneously, the heat of activation is changes from 79.88 kJ/mol to 55.32 kJ/mol. Moreover, the -(η/Τ) i …

A Preliminary Study Of The Synthesis Of Tin Based Amorphous Material And Its Behavior On Lithium Intercalation, Li Liu, Hanxi Yang, Jutang Sun, Xingping Ai

Journal of Electrochemistry

An amorphous lithium inserting anode material based on Tin oxide glass was synthesized by salification in solution and its properties on lithium intercalation was investigated by X ray diffraction(XRD), microelectrode voltammetry and charge discharge measurements. The results have shown that this kind of material has considerable electrochemical reversibility toward lithium intercalation deintercalation. The available discharge capacity of the material reaches 430 mA·h/g with charge_discharge efficiency over 90%, showing a great potential for practical use.

Study Of The Effect Of Rare Earth Ions On Dna Using Cyclic Voltammetry And Spectroscopy, Heibai Shen, Yuzhuan Kang, Haifeng Yang, Lin Yu, Zongrang Zhang

Journal of Electrochemistry

The interaction between rare earth ions(e.g.Eu 3+ ,Ce 3+ ,Er 3+ ,Sm 3+ ,Tb 3+ ,La 3+ and Nd 3+ ) and DNA had been investigated by using Cyclic Voltammetry, Ultraviolet and Raman Spectroscopy. After the adding of Ce 3+ ion to DNA solution, the cathodic peak current of Ce 3+ ion reduction was found to decrease obviously, and the anodic peak current to decrease even more significantly. Differential UV spectra of Ce 3+ ion depicted hyperchromic effect after the reaction of these two species and a new peak of 272 nm was found. Differential UV spectra of DNA also …

Drect Electro_Oxidation Synthesis Of D Arabinose On Spectroscopic Graphite Electrode, Hei Wei, Huang Ying

Journal of Electrochemistry

D Arabinose synthesized by direct electro_oxidative decarboxylation of D gluconate on graphite electrode from aqueous solutions. The effects of D gluconate concentration, electrolysis potential, temperature and electrolyte composition on the current efficiency and product yield of electrosynthsis are discussed. The laboratory scale electrosynthesis was achieved with flow through cell.The optimum technology conditions for electrosynthesis were obtained with orthogonal design method.Both galvanostatic and potentionstatic conditions have been exploited, the later was found to be more effective.

Study On The Ti/Sno 2/Pbo 2 Anode In Sulphuric Acid Solution, Yaogang Li, Yanpin Shun, Wenlin Xu

Journal of Electrochemistry

The Ti/SnO 2/PbO 2 electrode, prepared by the electrodeposition method, was tested as the anode for the oxygen evolution reaction in 1 mol/L H 2SO 4 solution and examined by means of EDS, SEM and XRD. The electrocatalytic activity and the electrochemical stability of the prepared electrode were found to be superior.

Wet Deposition In A Global Size-Dependent Aerosol Transport Model: 2. Influence Of The Scavenging Scheme On 210pb Vertical Profiles, Surface Concentrations, And Deposition, W Guelle, Y J. Balkanski, Jack E. Dibb, M Schulz, F Dulac

Earth Sciences

The main atmospheric sink for submicron aerosols is wet removal. Lead 210, the radioactive decay product of ²²²Rn, attaches immediately after being formed to submicron particles. Here we compare the effects of three different wet-scavenging schemes used in global aerosol simulations on the ²¹⁰Pb aerosol distribution using an off-line, size-resolved, global atmospheric transport model. We highlight the merits and shortcomings of each scavenging scheme at reproducing available measurements, which include concentrations in surface air and deposition, as well as vertical profiles observed over North America and western and central North Pacific. We show that model-measurement comparison of total …

Deglacial Radiocarbon Chronology Of The Western Ross Sea From Relative Sea-Level Curves, George H. Denton, Brenda Hall

University of Maine Office of Research Administration: Grant Reports

This award provides support for one year of funding to perform carbon-14 analyses on samples (seal skin and Adamussium colbecki shells) collected in firm stratigraphic position within numerous raised beaches along the Scott Coast of the western Ross Sea, Antarctica. These measurements will enable the development of a radiocarbon chronology and will result in detailed relative sea- level curves for five separate localities along the Scott Coast. These relative sea-level curves will help to constrain the timing of deglaciation in the western Ross Sea. During the last glaciation, West Antarctic ice expanded into the Ross Sea, merged with East Antarctic …

Process For Enhancing The Activity Of Amyloid Β Peptides, Kenneth Hensley, D. Allan Butterfield, John M. Carney, Michael Aksenov

Chemistry Faculty Patents

A novel process for enhancing activity of an oligopeptide or polypeptide comprising the steps of: providing an oligopeptide or polypeptide, dissolving the oligopeptide or polypeptide in an organic solvent, heating, removing the solvent, and recovering an oligopeptide or polypeptide with enhanced activity is disclosed. Also disclosed are novel oligopeptides and polypeptides enhanced by the process according the invention.

Strong Dissipative Behavior In Quantum Field Theory, Arjun Berera, Marcelo Gleiser, Rudnei O. Ramos

Dartmouth Scholarship

We study the conditions under which an overdamped regime can be attained in the dynamic evolution of a quantum field configuration. Using a real-time formulation of finite temperature field theory, we compute the effective evolution equation of a scalar field configuration, quadratically interacting with a given set of other scalar fields. We then show that, in the overdamped regime, the dissipative kernel in the field equation of motion is closely related to the shear viscosity coefficient, as computed in scalar field theory at finite temperature. The effective dynamics is equivalent to a time-dependent Ginzburg-Landau description of the approach to equilibrium …

Batelaan And Gay Reply, Herman Batelaan, Timothy J. Gay

Timothy J. Gay Publications

In their Comment [1] to our Letter [2], Rutherford and Grobe first disagree with our conclusion that “a tabletop Stern-Gerlach filter is feasible.” Given our estimate of the throughput for such a device, ~0.3 electrons/s, we were clearly not proposing it as an alternative to standard polarized electron sources (~10¹⁵ electrons/s). The main argument for “feasibility” is based on the relatively low currents required to establish the solenoidal magnetic field (5 A)—hence the use of the word “tabletop” in the abstract. In retrospect, a better statement would have been that “experimental demonstration of such a spin-splitting effect may be …

Insulator-Metal Crossover Near Optimal Doping In Pr22xcexcuo4: Anomalous Normal-State Low Temperature Resistivity, P. Fournier, P. Mohanty, E. Maiser, S. Darzens, T. Venkatesan, C. J. Lobb, G. Czjzek, Richard A. Webb, R. L. Greene

Faculty Publications

Normal-state resistivity measurements at high fields and low temperatures in electron-doped Pr_2-xCe_xCuO₄ thin films reveal an insulator-metal crossover near a doping level x≈0.15, similar to a previous report on hole-doped La_2-xSr_xCuO₄. The temperature dependence of the resistivity of insulatinglike samples is sublogarithmic, while for metallic samples (with x = 0.17) the resistivity is linear from 40 mK to 40 K. This surprising latter observation suggests an unusual contribution to the scattering processes at low temperature in these materials. We conclude that the ground state at x = 0.15, corresponding …

Laser Cooling And Trapping Of Argon Metastable Atomic Beam, Juan Carlos Catala

FIU Electronic Theses and Dissertations

The high velocity of free atoms associated with the thermal motion, together with the velocity distribution of atoms has imposed the ultimate limitation on the precision of ultrahigh resolution spectroscopy. A sample consisting of low velocity atoms would provide a substantial improvement in spectroscopy resolution.

To overcome the problem of thermal motion, atomic physicists have pursued two goals; first, the reduction of the thermal motion (cooling); and second, the confinement of the atoms by means of electromagnetic fields (trapping). Cooling carried sufficiently far, eliminates the motional problems, whereas trapping allows for long observation times.

In this work the laser cooling …

Soluble Species In Aerosol And Snow And Their Relationship At Glacier 1, Tien Shan, China, Junying Sun, Dahe Qin, Paul A. Mayewski, Jack E. Dibb, Sallie I. Whitlow, Zhongqin Lee, Qinzhao Yang

Earth Sciences

Simultaneous sampling of aerosol (n = 20) and snow (n = 114) was made at Glacier 1, Tien Shan, between May 19 and June 29, 1996. Similar temporal patterns of some major ion (calcium, magnesium, potassium, sodium, chloride, and sulfate) concentrations between snow and aerosol show that snow chemistry basically reflects changes in the chemistry of the atmosphere. This gives us confidence in the reconstruction of past atmospheric change using some snow data. There are no significant correlations between aerosol and snow samples for ammonium and nitrate. This suggests that post-depositional and/or post-collection processes may alter ammonium and nitrate concentrations …

Soluble Species In Aerosol And Snow And Their Relationship At Glacier 1, Tien Shan, China, Junying Sun, Dahe Qin, Paul Andrew Mayewski, Jack E. Dibb, Sallie Whitlow, Zhongqin Li, Qinzhao Yang

Earth Science Faculty Scholarship

Simultaneous sampling of aerosol (n = 20) and snow (n = 114) was made at Glacier 1, Tien Shan, between May 19 and June 29, 1996. Similar temporal patterns of some major ion (calcium, magnesium, potassium, sodium, chloride, and sulfate) concentrations between snow and aerosol show that snow chemistry basically reflects changes in the chemistry of the atmosphere. This gives us confidence in the reconstruction of past atmospheric change using some snow data. There are no significant correlations between aerosol and snow samples for ammonium and nitrate. This suggests that postdepositional and/or postcollection processes may alter ammonium and …

Laser-Plasma Harmonics With High-Contrast Pulses And Designed Prepulses, R.S. Marjoribanks, L. Zhao, F.W. Budnik, G. Kulcsar, A. Vitcu, H. Higaki, R. Wagner, Anatoly Maksimchuk, Donald P. Umstadter, S.P. Le Blanc, M.C. Downer

Donald Umstadter Publications

One aspect of the complexity of mid- and high-harmonic generation in highintensity laser-plasma interactions is that nonlinear hydrodynamics is virtually always folded together with the nonlinear optical conversion process. We have partly dissected this issue in picosecond and subpicosecond interactions with preformed plasma gradients, imaging and spectrally resolving low- and mid-order harmonics. We describe spatial breakup of the picosecond beam in preformed plasmas, concomitant broaden~ng and breakup of the harmonic spectrum. presumably through self-phase modulation, together with data on the sensitivity of harmonics production efficiency to the gradient or extent of prefomed plasma. Lastly. we show preliminary data of regular …

Near–Infrared Classification Spectroscopy: H–Band Spectra Of Fundamental Mk Standards, Michael R. Meyer, Suzan Edwards, Kenneth H. Hinkle, Stephen E. Strom

Astronomy: Faculty Publications

We present a catalog of H-band spectra for 85 stars of approximately solar abundance observed at a resolving power of 3000 with the KPNO Mayall 4 m Fourier Transform Spectrometer. The atlas covers spectral types O7M5 and luminosity classes IV as defined in the MK system. We identify both atomic and molecular indices and line ratios that are temperature and luminosity sensitive, allowing spectral classification to be carried out in the H-band. The line ratios permit spectral classification in the presence of continuum excess emission, which is commonly found in premain-sequence or evolved stars. We demonstrate that with …

Development Of A Generalized Theoretical Model For The Response Of A Phase/Doppler Measurement System To Arbitrarily Oriented Fibers Illuminated By Gaussian Beams, Scott A. Schaub, James A. Lock, Amir A. Naqwi

Physics Faculty Publications

We present a generalized theoretical model for the response of the phase/Doppler (P/D) measurement system to light scattered by cylindrical fibers. This theoretical model is valid for arbitrary fiber diameters and refractive indices, for Gaussian incident beams, and it accounts for arbitrary fiber orientations, fiber positions, and effects that are due to the two-dimensional receivers. The generalized P/D computer model (GPDCM) is the extension of an earlier study by the authors, combining past P/D simulation methodology with recent developments in modeling light scattering by tilted cylindrical fibers. A FORTRAN computer program that implements the GPDCM theoretical development was written and …

A Realtime Internet Based Quality Control Application For Hurricane Surface Wind Observations, Luis R. Amat Jr.

FIU Electronic Theses and Dissertations

This thesis chronicles the design and implementation of a Intemet/Intranet and database based application for the quality control of hurricane surface wind observations. A quality control session consists of selecting desired observation types to be viewed and determining a storm track based time window for viewing the data. All observations of the selected types are then plotted in a storm relative view for the chosen time window and geography is positioned for the storm-center time about which an objective analysis can be performed. Users then make decisions about data validity through visual nearestneighbor comparison and inspection. The project employed an …

U-Duality, D-Branes And Black Hole Emission Rates: Agreements And Disagreements, Fay Dowker, David Kastor, Jennie Traschen

David Kastor

An expression for the spacetime absorption coefficient of a scalar field in a five dimensional, near extremal black hole background is derived, which has the same form as that presented by Maldacena and Strominger, but is valid over a larger, U-duality invariant region of parameter space and in general disagrees with the corresponding D-brane result. We develop an argument, based on D-brane thermodynamics, which specifies the range of parameters over which agreement should be expected. For neutral emission, the spacetime and D-brane results agree over this range. However, for charged emission, we find disagreement in the `Fat Black Hole' regime, …

Sputter Deposition Of High Resistivity Boron Carbide, Ahmad A. Ahmad, Natale J. Ianno, Seong-Don Hwang, Peter A. Dowben

Peter Dowben Publications

We have succeeded in the rf magnetron sputter deposition of high resistivity boron carbide (B1−xCx). This has been accomplished by the sputter depositing the boron carbide from a methane saturated boron carbide target. We show that the composition and optical band gap of the sputter deposited material are functions of the applied rf power. Furthermore, boron carbide/silicon heterojunction diodes fabricated via sputtering compare favorably with those fabricated from borane cage molecule sources using plasma enhanced chemical vapor deposition (PECVD).

Ua12/2/1 College Heights Herald, Vol. 74, No. 23, Wku Student Affairs

WKU Archives Records

WKU campus newspaper reporting campus, athletic and Bowling Green, Kentucky news. This issue contains articles:

• Fire Guts Kappa Alpha House
• Goetz, Kristina. Liver Recipient Relishing Chance at Life – Jim Marcotte
• Sutton, Lyndsay. Graduation Delay Equals Financial Turmoil
• Normal Crosswalk Bad Idea
• Tabor, Chris. Editorial Cartoon re: Normal Crosswalk
• Wilkins, David. Student Government Association Self-Serving, Ignoring Debate
• E., Justin. Editorial Cartoon re: World Wrestling Federation Political Candidates
• Back, Shannon. Taking Out the Garbage – Recycling
• Goddard, Holly. Anne Lewis Explores Appalachian Life
• Goddard, Holly. Lengthy Debates Blamed for Student Government Association Dropouts
• Lucas, Fred. Stacey Coy Remembered Through Scholarship
• Parking …

Ultralow-Energy Electrons From Fast Heavy-Ion Helium Collisions: The “Target Cusp“, W. Schmitt, R. Moshammer, F. S.C. O'Rourke, H. Kollmus, L. Sarkadi, R. Mann, S. Hagmann, Ronald E. Olson, J. Ullrich

Physics Faculty Research & Creative Works

Doubly differential cross sections d2σ / dν ‖ dν⊥ have been obtained by mapping the 3-dimensional velocity space of ultralow- and low-energy electrons \ (1.5 meV < = Ee < = 100 eV \) emitted in singly ionizing 3.6 MeV / u Au53+ on helium collisions. A sharp \ ( ΔEFWHMe⊥< = 22 meV \) asymmetric peak centered at = 0 is observed to emerge at ultralow energies from the strongly forward shifted low-energy electron velocity distribution. The shape of this "target cusp," which is very sensitive on the details of the two-center potential, is in excellent accord with theoretical predictions. © 1998 The American Physical Society.

The Effect Of A Uniform Electric Field On Homogeneous Vapor–Liquid Nucleation In A Dipolar Fluid. I. Stockmayer Fluid, K.J. Oh, G.T. Gao, Xiao Cheng Zeng

Xiao Cheng Zeng Publications

The rate of homogeneous vapor–liquid nucleation is controlled mainly by the Gibbs formation free energy of critical clusters. Within the framework of thei/υ cluster theory of Reiss and co-workers, the formation free energies of Stockmayer clusters in the presence of a uniform electric field are determined. The Helmholtz free energy of the clusters, an input required in the i/υ cluster theory, is calculated via Monte Carlo simulations. The most significant result is that as a uniform electric field is applied the formation free energy at fixed supersaturation of the vapor becomes larger than that in the absence …

Nitric Acid Scavenging By Mineral And Biomass Burning Aerosols, A Tabazadeh, M Z. Jacobson, H B. Singh, O Brian Toon, J S. Lin, R B. Chatfield, A N. Thakur, R. Talbot, Jack E. Dibb

Earth Sciences

The abundance of gas phase nitric acid in the upper troposphere is overestimated by global chemistry-transport models, especially during the spring and summer seasons. Recent aircraft data obtained over the central US show that mineral aerosols were abundant in the upper troposphere during spring. Chemical reactions on mineral dust may provide an important sink for nitric acid. In regions where the mineral dust abundance is low in the upper troposphere similar HNO₃ removal processes may occur on biomass burning aerosols. We propose that mineral and biomass burning aerosols may provide an important global sink for gas phase nitric acid, …

Black Holes With Magnetic Charge And Quantized Mass, A. Yu. Ignatiev, G. C. Joshi, Kameshwar C. Wali

Physics - All Scholarship

We examine the issue of magnetic charge quantization in the presence of black holes. It is pointed out that quantization of magnetic charge can lead to the mass quantization for magnetically charged black holes. We also discuss some implications for the experimental searches of magnetically charged black holes.

Analytical Mechanics, Janet Scheel, Louis Hand

Janet D. Scheel

No abstract provided.