Digital Commons Network^™

Constitution Of The Senate Of The Faculty, May 2000, University Of Mississippi. Faculty Senate

Constitutions

The constitution of the faculty senate of the University of Mississippi, updated May 2000.

A Spectroscopic Redshift For The Cl 0024+16 Multiple Arc System: Implications For The Central Mass Distribution, Tom Broadhurst, Xiaosheng Huang, Brenda Frye, Richard Ellis

Physics and Astronomy

We present a spectroscopic redshift of z = 1.675 for the well-known multiply lensed system of arcs seen in the z = 0.39 cluster Cl 0024+16. In contrast to earlier work, we find that the lensed images are accurately reproduced by a projected mass distribution which traces the locations of the brightest cluster elliptical galaxies, suggesting that the most significant minima of the cluster potential are not dynamically erased. The averaged mass profile is shallow and consistent with predictions of recent numerical simulations. The source redshift enables us to determine an enclosed cluster mass of M(<100 kpc h-1) = …

Snapover: Anomalous Plasma Current Collection By Positively Biased Conductors When Surrounded By A Dielectric, Clint Thomson, John R. Dennison

All Physics Faculty Publications

Over the last decade, high-powered spacecraft have been designed that will operate at voltages greater than 100 V. At these voltages, the solar arrays can undergo both destructive arcing at negative biases, and plasma electron current collection at positive biases. Furthermore, above some critical positive bias voltage (~100 V), the electron current collected by the array interconnects increases dramatically through a phenomenon termed Asnapover@. During snapover, large portions of the solar array cover glass charge positively, and begin to draw electron current from the plasma as if it were a conducting surface. This leads to substantial power losses for the …

The Faculty Notebook, May 2000, Provost's Office

Faculty Notebook

The Faculty Notebook is published periodically by the Office of the Provost at Gettysburg College to bring to the attention of the campus community accomplishments and activities of academic interest. Faculty are encouraged to submit materials for consideration for publication to the Associate Provost for Faculty Development. Copies of this publication are available at the Office of the Provost.

Student Honors And Awards Program 2000, University Relations

UMM Honors and Awards Ceremony

In recognition of students who demonstrate academic excellence and enrich campus life.

Forward Ion Acceleration In Thin Films Driven By A High-Intensity Laser, Anatoly Maksimchuk, S. Gu, K. Flippo, Donald P. Umstadter, V. Yu. Bychenkov

Donald Umstadter Publications

A collimated beam of fast protons, with energies as high as 1.5 MeV and total number of ≳10⁹, confined in a cone angle of 40°±10° is observed when a high-intensity high-contrast subpicosecond laser pulse is focused onto a thin foil target. The protons, which appear to originate from impurities on the front side of the target, are accelerated over a region extending into the target and exit out the back side in a direction normal to the target surface. Acceleration field gradients ∼10 GeV/cm are inferred. The maximum proton energy can be explained by the charge-separation electrostatic-field acceleration …

Local Properties Of Query Languages, Guozhu Dong, Leonid Libkin, Limsoon Wong

Kno.e.sis Publications

In this paper we study the expressiveness of local queries. By locality we mean — informally — that in order to check if a tuple belongs to the result of a query, one only has to look at a certain predetermined portion of the input. Examples include all relational calculus queries. We start by proving a general result describing outputs of local queries. This result leads to many easy inexpressibility proofs for local queries. We then consider a closely related property, namely, the bounded degree property. It describes the outputs of local queries on structures that locally look “simple.” Every …

Fept:Sio2 Granular Thin Film For High Density Magnetic Recording, C.P. Luo, Sy_Hwang Liou, David J. Sellmyer

Sy-Hwang Liou Publications

Nanocomposite FePt:SiO₂ thin films consisting of high anisotropy FePt particles embedded in a SiO₂ matrix have been successfully fabricated by annealing the as-deposited FePt/SiO₂ multilayers. By adjusting the annealing temperatures and compositions, films were obtained with coercivity of 3.8 kOe and grain size of 10 nm, which are suitable for high-density magnetic recording. Magnetic activation volumes were measured and thermal stability is discussed.

The Chanticleer, 2000-05-01 (Summer), Coastal Carolina University

The Chanticleer Student Newspaper

The editorially independent student produced weekly newspaper of Coastal Carolina University.

Effects Of Ga Substitution For Fe On The Structure And Magnetic Properties Of Nd8.4Fe87.1-XGaXB4.5 (X = 0–2.2) Alloys Prepared By Mechanical Alloying, B.Z. Cui, X.K. Sun, W. Liu, Z.D. Zhang, D.Y. Geng, X.G. Zhao, J. Ping Liu, David J. Sellmyer

David Sellmyer Publications

The effects of a partial substitution of Ga for Fe on the structure and magnetic properties of mechanically alloyed Nd_8.4Fe_87.1B_4.5 were studied. With increasing Ga content, the magnetic properties of the nanocomposite magnets first improve, reach maxima at 1.1 at.% Ga, and then degrade. The addition of Ga helps to control the morphology, especially the grain sizes of both α -Fe and Nd₂Fe₁₄B.

Curie Temperature Of Multiphase Nanostructures, Ralph Skomski, David J. Sellmyer

David Sellmyer Publications

The Curie temperature and the local spontaneous magnetization of ferromagnetic nanocomposites are investigated. The macroscopic character of the critical fluctuations responsible for the onset of ferromagnetic order means that there is only one Curie temperature, independent of the number of magnetic phases present. The Curie temperature increases with the grain size and is, in general, larger than predicted from the volume averages of the exchange constants. However, the Curie-temperature enhancement is accompanied by a relative reduction of the spontaneous magnetization. Due to the quadratic dependence of the permanent-magnet energy product on the spontaneous magnetization, this amounts to a deterioration of …

Herbicide Movement And Dissipation At Four Midwestern Sites, S. A. Clay, R. H. Dowdy, J. A. Lamb, J. L. Anderson, B. Lowery, R. E. Knight, D. E. Clay

Agronomy, Horticulture and Plant Science Faculty Publications

This study was conducted to evaluate atrazine (2‐chloro‐4‐ethylamino‐6‐isopropyl‐1, 3, 5‐triazine) and alachlor (2‐chIoro‐N‐(methoxymethyl)acetamide) dissipation and movement to shallow aquifers across the Northern Sand Plains region of the United States. Sites were located at Minnesota on a Zimmerman fine sand, North Dakota on Hecla sandy loam, South Dakota on a Brandt silty clay loam, and Wisconsin on a Sparta sand. Herbicide concentrations were determined in soil samples taken to 90 cm four times during the growing season and water samples taken from the top one m of aquifer at least once every three months. Herbicides were detected to a …

Macalester Today May 2000, Macalester College

Macalester Today

No abstract provided.

Univercity News (2000-05-01)

UniverCity News, 1998-2001

VCU Today, the University’s first official administrative organ, began as a somewhat irregular monthly publication but moved to a bi-weekly newspaper format in the 1980s. The newspaper changed its name to VCU Voice in 1988 and ten years later it appeared under the title UniverCity News. As it neared the end of its run as a physical newspaper, the publication became simply VCU News. These four publications were essentially the same periodical published under different titles by the Office of University Relations. VCU News appeared online for the first time in 2002.

Integrating Domain Knowledge With Data: From Crisp To Probabilistic And Fuzzy Knowledge, Hung T. Nguyen, Vladik Kreinovich, Leonid Reznik

Departmental Technical Reports (CS)

It is well known that prior knowledge about the domain can improve (often drastically) the accuracy of the estimates of the physical quantities in comparison with the estimates which are solely based on the measurement results. In this paper, we show how a known method of integrating crisp domain knowledge with data can be (naturally) extended to the case when the domain knowledge is described in statistical or fuzzy terms.

How Important Is Theory For Practical Problems? A Partial Explanation Of Hartmanis' Observation, Vladik Kreinovich, Luc Longpre

Departmental Technical Reports (CS)

No abstract provided.

Granularity As An Optimal Approach To Uncertainty - A General Mathematical Idea With Applications To Sleep, Consumption, Traffic Control, Learning, Etc., Vladik Kreinovich, Hung T. Nguyen

Departmental Technical Reports (CS)

Traditional statistical and fuzzy approaches to describing uncertainty are continuous in the sense that we use a (potentially infinite) set of values from the interval [0,1] to characterize possible degrees of uncertainty. In reality, experts describe their degree of belief by using one of the finitely many words from natural language; in this sense, the actual description of expert uncertainty is granular.

In this paper, we show that in some reasonable sense, granularity is the optimal way of describing uncertainty. A similar mathematical idea explains similar "granularity" in such diverse areas as sleep, consumption, traffic control, and learning.

A New Graph Characteristic And Its Application To Numerical Computability, Frank Harary, Vladik Kreinovich, Luc Longpre

Departmental Technical Reports (CS)

Many traditional numerical algorithms include a step on which we check whether a given real number a is equal to 0. This checking is easy for rational numbers, but for constructive real numbers, whether a number is 0 or not is an algorithmically undecidable problem. It is therefore desirable to re-formulate the existing algorithms with as few such comparisons as possible. We describe a new graph characteristic; this characteristic describes how the number of comparisons in an algorithm can be reduced.

A Comment On The Shape Of The Solution Set For Systems Of Interval Linear Equations With Dependent Coefficients, Goetz Alefeld, Vladik Kreinovich, Guenter Mayer, Michael Huth

Departmental Technical Reports (CS)

This article is a short supplement to our previously published paper, in which we prove that each semialgebraic set can be represented as a projection of a solution set of some system of linear equations with dependent coefficients. The new results says that interval occurring can be chosen as narrow as wanted. This new result is proven by a simple linear transformation.

Re-Defining National Security In The Technology Age: The Encryption Export Debate;Note, Mark T. Pasko

Journal of Legislation

No abstract provided.

An Infrastructure For A Mobile-Agent System That Provides Personalized Services To Mobile Devices, Debbie O. Chyi

Dartmouth College Undergraduate Theses

In this paper, we present the design of a mobile-agent system that provides a mobile user with a personalized information retrieval service and we describe the implementation of the infrastructure for such a system. This "Personal Agent System" gathers information from the Internet and uses context-aware mechanisms to manage the information according to a mobile user's needs and preferences. The user's schedule and location are the context indicators in this system. These indicators are critical in ensuring that users obtain only the information they want, receive information in a form that is most useful for viewing on their mobile device, …

A Simulation Of Auroral Absorption, Eric Michael Greenberg

Dartmouth College Undergraduate Theses

HF radio transmissions propagate long distances by reflecting off the ionosphere. At high latitudes radio propagation is strongly affected by the northern lights (aurora borealis), which causes ionization at low altitudes and hence the absorption of radio waves. Models of this process are still in a primitive state. A simulation of radio wave propagation was created in order to test Foppiano and Bradley's empirical model of auroral absorption. The simulation attempts to predict the net absorption of signals at a receiver by simulating a large number of transmitters, even though the exact sources of the signals are unknown. Although the …

Insights, Spring, 2000, Utah State University

Discovery Magazine

Bi-annual alumni newsletter for the College of Science of Utah State University in Logan.

May 20, 2000 - Archway Commencement Issue

Archway (1946-2020)

2000 Archway Commencement Issue

University Of Minnesota, Morris 2000 Commencement, University Relations

UMM Commencement

The Thirty-seventh University of Minnesota, Morris Commencement Ceremonies at Four O'Clock Friday, the Twelfth of May, Two Thousand Morris, Minnesota

Doomsday Fears At Rhic, Thomas D. Gutierrez

Physics

This year, the Relativistic Heavy Ion Collider (RHIC) is poised to begin a program of cutting-edge nuclear science. Recently, alarmist journalism unnecessarily raised public fears about implausible doomsday scenarios associated with the machine.

Current, May 01, 2000, University Of Missouri-St. Louis

Current (2000s)

No abstract provided.

Effect Of Daily Fluctuations From Flaming Gorge Dam On Ice Processes In The Green River, John W. Hayse, Steven F. Daly, Andrew Tuthill, Richard A. Valdez, Bryan Cowdell, Gary Burton

All U.S. Government Documents (Utah Regional Depository)

This report provides results and conclusions of a detailed investigation of ice processes in the main channel of the reach of the Green River between the downstream end of Split Mountain (River Mile [RM1] 320) and the Ouray, Utah Bridge (R.M248). The objective of the study was to examine the influence of daily fluctuations in water releases from Flaming Gorge Damon river ice processes in this reach, which serves as an overwintering area for endangered Colorado pikeminnow and razorback sucker. The objective of the study was met through examination of historical records of winter water and air temperatures, flow measurements, …

Fisheries Research Report No. 119 - Final Report, Frdc Project 95/037: The Biology And Stock Assessment Of The Tropical Sardine, Sardinella Lemuru, Off The Mid-West Coast Of Western Australia, Daniel J. Gaughan, Ronald W. Mitchell

Fisheries Research Reports

Exploratory fishing for the tropical sardine, Sardinella lemuru, offshore of Geraldton on the midwest coast of Western Australia in the early 1990s, led to the establishment of a developmental purse seine fishery in this region. This fishery showed potential for substantial expansion, but as there was no information on S. lemuru in WA there was a need to undertake research during the developmental period. The biology and fishery for S. lemuru in WA were therefore investigated over a three year period between July 1995 and June 1998 with the aim of providing stock assessment advice.

The biology of S. lemuru …

Fisheries Research Report No. 121 - Synopsis Of The Biology And Exploitation Of The Blue Swimmer Crab, Portunus Pelagicus Linnaeus, In Western Australia, Mervi I. Kangas

Fisheries Research Reports

This report summarises the existing studies which have provided information on the biology, population characteristics and exploitation of the blue swimmer crab, Portunus pelagicus, in Western Australia. Gaps in the existing knowledge are also highlighted to assist in targeting new research initiatives. Portunus pelagicus matures at about one year and in temperate regions females mate only once a year. This is because mature crabs moult only once a year. It appears from studies to date that Western Australian crabs are one genetic population. This is being further investigated. Migration of the blue swimmer crab occurs between estuaries and the ocean …