Digital Commons Network^™

A Study On The Cylindrical Zinc-Air Battery, Sheng-Sian Li, Gui-Mao Zhou, Xin-Ping Ai, Han-Xi Yang

Journal of Electrochemistry

The zinc air battery has advantages of high specific energies and low cost, therefore attracts much interests. However, its application is limited only in prismatic and button type.This paper reported a novel design of cylindrical zinc air batteries and the performances of the batteries tested at various conditions. The results showed that when discharged at the current of 40 mA at 20 °C, the capacity of AA size and AAA size batteries reached 4000mAh and 1400mAh respectively, corresponding to the energy densities 280 Wh/kg and 200 Wh/kg. The effects of the discharge current, temperature and humidity on the performances of …

Synthesis Of Li1+XMn2O4 Cathode Material For Lithium-Ion Batteries With Solution Method, Pei-Song Liu, Sing-Quarn Liu, Qing Li, Zhao-Yong Chen, Bai-Lan Zhang, Zuo-Long Yu

Journal of Electrochemistry

The cathode materials Li_1+xMn₂O₄ were prepared with citric acid complexing and solution impregnating methods. Structure characterization and specific surface area test were performed by means of XRD, BET methods, the influences of calcination temperature, Li/Mn molar ratio and raw materials on the structure and electrochemical capacity of samples have beem examined. The results showed that the Li/Mn molar ratio and calcimation temperature were the key factors affecting the electrochemical capacity of cathode materias. The optimum conditions for synthesis of  Li_1+xMn₂O₄ cathode material were 0≤x≤0.05 and calcined at 750°C. The initial …

The Effect Of Anode Thickness In Sofcs With Anode Supported Ysz Film, Yi-Huang Zhang, Yi Jiang, Zi-Gui Lu, Yong-Lai Dong, Jing-Wang Yan

Journal of Electrochemistry

Solid oxide fuel cells with supported yttria stabilized zirconia electrolyte films on anode substrates of various thickness have been fabricated. The electrochemical performances of the SOFCs have been examined. The results showed that the cell performance was limited by the anodic overpotential, which is caused mainly by a concentration polarization when the anode substrate is thick. The anodic overpotential was reduced obviously as the thickness of anode substrate was decreased. As a result, the performance of the SOFC cell was improved. With a 0.5 mm anode substrate, a SOFC cell produced a power density about 0.19 W/cm² at 800 …

A New Method For The Preparation Of The Electrodes With Very Low Platinum Loading Used In Proton Exchange Membrane Fuel Cell, Zhi-Gang Shao, Bao-Lian Yi, Ming Han, Ya-Guang Qiao, Hao Liu, Jing-Rong Yu

Journal of Electrochemistry

Research and development on low platinum loading electrode is very important in reducing the cost of proton exchange membrane fuel cell(PEMFC) stack. This paper has put forward a new method to prepare the electrode of PEMFC. The pore forming substances were used in this methd. The low platinum loading electrodes (0.02 mg_Pt⋅cm^-2) have already been prepared with the method. Compared with the traditional method, the new method is simple, cheep, and easy to scale up. The superior composition of the electrodes is catalyst: pore forming substance: Nafion= 3:3:1. The performance of a single cell using this …

Illinois Wesleyan University Announces New Faculty Members, Stew Salowitz

News and Events (Discontinued Series)

No abstract provided.

Deafdigest Gold: Vol. 5, No. 4 August 27, 2000, Barry Strassler

DeafDigest Gold 2000

No abstract provided.

Information Needs In The 21st Century: Will Eric Be Ready?, Lawrence M. Rudner

Education Policy Analysis Archives (EPAA)

Ubiquitous for 35 years, the Educational Resources Information Center (ERIC) is known for its database and recently for its range of web-based information services. I contend that federal policy with regard to ERIC must change and that ERIC will need massive restructuring in order to continue to meet the information needs of the education community. ...

Education Policy Analysis Archives 08/44 , Arizona State University, University Of South Florida

College of Education Publications

Information needs in the 21st century : will ERIC be ready? / Lawrence M. Rudner.

Design And Test Of An Economical Cold Gas Propulsion System, Joseph Cardin, Jesus Acosta

Small Satellite Conference

Small satellites are emerging as the preferred platform for a wide variety of earth orbit and even interplanetary missions. These spacecraft are, by their very nature, extremely limited in budget, volume, mass and power. Existing fluid propulsion options are too large, costly and complex for many small satellite applications. In an attempt to address this problem VACCO has produced an inexpensive, modular system specifically designed for the special needs of small satellites. This paper documents the results of a development program conducted for NASA and administered by the Applied Physics Laboratory of John Hopkins University. The Cold Gas Propulsion System …

Microspacecraft Platform With Bipropellant Propulsion System And 3-Axis Stabilization For Missions In Earth Orbit And Beyond Leo , P. Eckart, S. Angelucci, L. Appolloni, H. Baier, M. Canales, A. Da Silva Curiel, E. Freidl, E. Igenbergs, M. Kesselmann, T. Neff, K. Pauly, T. Pühlhofer, F. Schlerka, W. Seefelder, L. Tarabini, A. Straub, S. Ullmann

Small Satellite Conference

This paper presents a low-cost microspacecraft platform concept for missions which require high D-v capabilities of up to about 1,500 m/s, using auxiliary launch opportunities, e.g., from the Ariane 5 ASAP. The proposed concept is extremely flexible and can be adapted to specific mission requirements, thus permitting low-cost missions to Earth orbit, as well as to the Moon, Mars, and selected asteroids. A particular focus of this paper is on the modularity of the proposed concept, including the bipropellant propulsion system needed to provide the required D-v, the lightweight structural concept, and the 3-axis attitude determination and control system (ADCS), …

Bounded Point Evaluations And Local Spectral Theory, Abdellatif Bourhim

Mathematics - All Scholarship

We study in this paper the concept of bounded point evaluations for cyclic operators. We give a negative answer to a question of L.R. Williams Dynamic Systems and Apllications 3(1994) 103-112. Furthermore, we generalize some results of Williams and give a simple proof of theorem 2.5 of L.R. Williams (The Local Spectra of Pure Quasinormal Operators J. Math. anal. Appl. 187(1994) 842-850) that non normal hyponormal weighted shifts have fat local spectra.

Volume 37, Number 44: August 25, 2000, University Of North Dakota

University Letter Archive

No abstract provided.

The Daily Egyptian, August 25, 2000, Daily Egyptian Staff

August 2000

No abstract provided.

The Bg News August 25, 2000, Bowling Green State University

BG News (Student Newspaper)

The BGSU campus student newspaper. August 25, 2000. Volume 86-Issue 1.

The Inkwell, Armstrong Atlantic State University

The Inkwell

No abstract provided.

The Daily Egyptian, August 24, 2000, Daily Egyptian Staff

August 2000

No abstract provided.

Nota Bene, August 24, 2000

Nota Bene, 2000

No abstract provided.

Professor Honored With Annual Faculty Award, Mitchell Diggs

University of Mississippi News

UNIVERSITY, Miss. -- Dr. John H. O'Haver, assistant professor of chemical engineering, arrived at The University of Mississippi barely four years ago, but his impact on the local educational community seems far greater than his tenure here. Besides being an admired teacher, O'Haver has been active in research, grant proposals, curriculum improvements and community service.

August 24, 2000, The Daily Mississippian

Daily Mississippian (all digitized issues)

No abstract provided.

Campus Chronicle (Vol. 3, No. 2), Valparaiso University

Campus Chronicle

No abstract provided.

Autonomous Operations Experiments For The Distributed Emerald Nanosatellite Mission , Christopher Kitts, Michael Swartwout

Small Satellite Conference

Distributed space systems are often cited as a means of enabling vast performance increases ranging from enhanced mission capabilities to increased system flexibility. Achieving this vision, however, will require radical advances in the automated control of these multi-satellite systems. To explore this challenge, Santa Clara University and Stanford University have initiated development of a simple, low cost, two-satellite mission known as Emerald. The Emerald mission includes several experiments involving the autonomous operation of distributed space systems. First, “low-level” inter-satellite navigation techniques will be explored. Second, “high-level” multi-satellite health and command management functions will be demonstrated. Due to operational considerations and …

The Jawsat Mission: Final Report And Lessons Learned , J. Smith, D. Richards, M. Wood, G. Sharp, W. Clapp

Small Satellite Conference

One Stop Satellite Solutions and the Center for Aerospace Technology recently completed the JAWSAT mission. This was the first flight of the Minotaur launch vehicle and the first time eleven separate micro and pico satellites were placed into orbit with one launch. The JAWSAT project required both new technical designs as well as new programmatic ways of conducting a space mission. Main stream, large satellite, methods were not adequate. Technical lessons learned on this project range from new techniques in versatile, low-cost, structural design to a reasonable method of qualifying commercial off-theshelf electronic components. New methods of final integration and …

Real-Time Attitude And Orbit Control System Of A Small Leo Satellite With Parallel-Processing Approach In A Ground Station, Roger Johnson, Sanjay Jayaram, Lei Sun, Chan Ho Ham

Small Satellite Conference

A Real-time Attitude and Orbit Control System (AOCS) using a parallel processing approach will be implemented using a Satellite Ground Control Station (SGCS). With this approach, the satellite will collect platform (attitude reference) and payload measurements (at 1Hz) over several orbits and down-link to the SGCS (at 5 KHz) where the real-time filtering, fault detection, diagnosis and corrective (if needed) control is generated. The control commands are up-linked to the satellite before losing telemetry lock. A substantial reduction in on-board computation can provide a cheaper and a higher reliable AOCS. In the proposed scheme, an advanced real-time estimation and control …

The Kyushu/Us Experimental Satellite Tether (Quest) Mission, A Small Satellite To Test And Validate Spacecraft Tether Deployment And Operations, Johan Carlson, Yosuke Nakamura

Small Satellite Conference

In recent years, an increased effort to design, build, and operate small satellites has taken place in universities and laboratories all over the world. These microsatellites provide numerous flight opportunities for science experiments at a fraction of the cost of larger traditional missions. In addition, there has been an increasing trend towards international cooperation on space projects. From the International Space Station to joint commercial ventures, the future of space progress will be shared by countries around the world. Tomorrow’s engineers must prepare for this challenge. This paper provides an overview of the Kyushu/US Experimental Satellite Tether (QUEST) mission, a …

Ua3/4/8/6 Harriett Downing Oral History, Harriett Downing, Sue Lynn Mcdaniel

WKU Administration Documents

Harriet Downing interviewed by Sue Lynn McDaniel regarding student life during World War II and her experiences as wife of WKU's fourth president, Dero Downing.

Oxidation Of [(Cyclic Triamine)(1,5-Cyclooctadiene)Iridium]+ Cations By Hydrogen Peroxide Forms Metallaoxetanes, Thomas C. Flood, Masanori Iimura, Jeremy M. Perotti, Arnold L. Rheingold, Thomas E. Concolino

Chemistry and Physics Faculty Articles

Iridaoxetane 3 formed by oxidation of 1 with aqueous H₂O₂ is isolated and characterized, providing a rare example of formation of a metallaoxetane by direct oxidation of a metal–alkene complex.

Exploring The Structure Of A Possible Light Scalar Nonet, Joseph Schechter, Deirdre Black, Amir H. Fariborz

Physics - All Scholarship

We first review the work of the Syracuse group, which uses an effective chiral Lagrangian approach, on meson-meson scattering. An illustration providing evidence for the existence of a strange scalar resonance of mass around 900 MeV is given. An attempt to fit this \kappa (900) together with a similarly obtained \sigma (560) and the well known a_0(980) and f_0(980) into a nonet pattern suggests that the underlying structure is closer to a dual quark-dual antiquark than to a quark-antiquark. A possible mechanism to explain a next higher-in mass scalar meson nonet is also discussed. This involves mixing between q{\bar q} …

The George-Anne, Georgia Southern University

The George-Anne

• Announcements
• Police Beat
• Opinions
• Sports
• Southern Life
• Classifieds

Microsatellites And Improved Acquisition Of Space Systems, Matt Bille, Robyn Kane, Drew Cox

Small Satellite Conference

Traditional Department of Defense (DoD) practices in the acquisition of space systems have focused on advanced versions of proven technology, meaning large satellites. This paradigm contributes to dependence on a handful of satellites, program schedules measured in decades, and the expensive oversight and program management functions which must be applied to systems which, since there are so few assets, cannot countenance failures. The escape from this paradigm is offered by Microsatellites (Microsats). Microsats are not only useful technology, but technology which enables a different approach to acquisition. What the authors call the Microsat Acquisition Paradigm (MAP) is partly modeled on …

Faculty Senate Meeting Minutes, 08/22/2000, P 35-65, Unm Faculty Senate

Faculty Senate Meeting Minutes, 1920 - 2013

No abstract provided.