Physical Sciences and Mathematics Commons^™

The Cultural Eutrophication Of Koontz Lake, Indiana: Causes, Consequences, Correction, Willaim B. Eviston, Thomas Crisman

School of Geosciences Faculty and Staff Publications

No abstract provided.

Variation In Sulfur Dioxide Emissions Related To Earth Tides, Halemaumau Crater, Kilauea Volcano, Hawaii, Charles B. Connor, Richard E. Stoiber, Lawrence L. Malinconico Jr.

School of Geosciences Faculty and Staff Publications

Variation in SO₂ emissions from Halemaumau crater, Kilauea volcano, Hawaii is analyzed using a set of techniques known as exploratory data analysis. SO₂ flux was monitored using a correlation spectrometer. A total of 302 measurements were made on 73 days over a 90‐day period. The mean flux was 171 t/d with a standard deviation of 52 t/d. A significant increase in flux occurs during increased seismic activity beneath the caldera. SO₂ flux prior to the this change varies in a systematic way and may be related to variation in the tidal modulation envelope.

Effect Of Computer Graphics Use On Student Understanding Of Calculus Concepts, Charlene E. Beckmann

Dissertations

Student understanding of selected calculus concepts as developed through use of a Cartesian coordinate graphical representation system were investigated. Subjects (N = 163) enrolled in first-semester calculus sections at Western Michigan University participated in one of four treatment conditions: Graphics (G), exposure to a computer-graphically-developed conceptual course; Graphics Plus (G+), exposure to the same course as G subjects plus provision of computer graphics software and related supplemental assignments; Standard 1 (S1), exposure to a graphically-developed, conceptual course; and Standard 2 (S2), exposure to a traditional skill-oriented course.

Two investigations were undertaken. In Investigation 1, comparisons were made between G and …

The Development Of A Personalized Computer Assisted School Psychology (Casp) System, Patricia Lou Steinert

Dissertations

The purpose of this project was to develop a model computer system to assist school psychologists in managing and manipulating data accumulated in the course of accomplishing their professional responsibilities. School psychologists have traditionally generated large amounts of data, but rarely have they looked across these data to obtain information and/or feedback about their own functioning relative to their professional role. The system described is intended as a model from which an individual psychologist might construct a system to meet individual needs. Data across students were accumulated in four broad areas: (1) personal effectiveness/accountability, (2) diagnosis, (3) local test norms, …

The Prairie Naturalist Volume 20, No. 4. December 1988

The Prairie Naturalist

Paul B. Kannowski, Editor

Nikki R. Seabloom, Assistant Editor

Douglas H. Johnson, Book Review Editor

TABLE OF CONTENTS

RANGE PLANT COMMUNITIES OF THE CENTRAL GRASSLAND RESEARCH STATION IN SOUTH CENTRAL NORTH DAKOTA ▪ C. L Lura, W. T. Barker, and P. E. Nyren

SEASONAL PATTERNS IN SAMPLING DATA FOR LARGEMOUTH BASS AND BLUE GILLS IN A NORTHERN GREAT PLAINS IMPOUNDMENT ▪ E. A. Bettross and D. W. Willis

INTRODUCTION, ESTABLISHMENT, AND DISPERSAL OF WESTERN MOSQUITOFISH IN NEBRASKA (ACTINOPTERYGII: POECILIIDAE) ▪ J. D. Lynch

OBSERVATIONS ON THE ECOLOGY OF CHIGGERS (ACARI: TROMBICULIDAE) FROM SOUTH DAKOTA ▪ E. R. Easton and W. …

Parallel (//) Ellpack: An Expert System For Parallel Processing Of Partial Differential Equations, Elias N. Houstis, John R. Rice, T. S. Papatheodorou

Department of Computer Science Technical Reports

No abstract provided.

The Young-Eidson Algorithm: Applications And Extensions, A. Hadjidimos, D. Noutsos

Department of Computer Science Technical Reports

No abstract provided.

A White Paper On High-Speed Network Architecture, Douglas E. Comer, John M. Steele, Raj Yavatkar

Department of Computer Science Technical Reports

No abstract provided.

Imacs Conference On Expert Systems For Numerical Computing, Elias N. Houstis

Department of Computer Science Technical Reports

No abstract provided.

On The Sorting Of Points Along An Algebraic Curve, John K. Johnstone, Chanderjit Bajaj

Department of Computer Science Technical Reports

No abstract provided.

On The Applications Of Multi-Equational Resultants, Chanderjit Bajaj, Thomas Garrity, Joe Warren

Department of Computer Science Technical Reports

No abstract provided.

Superconducting Tl-Ba-Ca-Cu-O Films By Sputtering, M. Hong, Sy_Hwang Liou, D.D. Bacon, G.S. Grader, J. Kwo, A.R. Kortan, B.A. Davidson

Sy-Hwang Liou Publications

Superconducting Tl-Ba-Ca-Cu-O thin films 0.2–1.0 µm thick have been prepared on MgO(100) and SrTiO₃ (100) substrates by dc diode sputtering using a single oxide target. Films containing primarily the Tl₂Ba₂Ca₁Cu₂O₈ phase were obtained with a T_c (R =0) at 102 K and a transport J_c of 10⁴ A/cm² at 90 K. For the nearly pure phase Tl₂Ba₂Ca₂Cu₃O₁₀ films, the T_c's (R =0) are higher at 116 K and the transport J_c's …

Geometric Modeling With Algebraic Surfaces, Chanderjit L. Bajaj

Department of Computer Science Technical Reports

No abstract provided.

The Internet Worm Program: An Analysis, Eugene H. Spafford

Department of Computer Science Technical Reports

No abstract provided.

A Current Algebra For Some Gauge Theory Amplitudes, V. Parameswaran Nair

Publications and Research

The classical amplitude for scattering of two positive helicity and n-2 negative helicity (or the other way) gauge bosons is shown to be generated by a Wess-Zumino-Witten (WZW) model for N= 4 supersymmetric gauge theory; i.e. the current algebra of the WZW model (with central charge k= 1 ) gives a Kac-Moody algebra as the symmetry behind these amplitudes.

Magnetic And Structural Properties Of Melt-Spun Rare-Earth Transition-Metal Intermetallics With Thmn12 Structure, E.W. Singleton, J. Strzeszewski, George C. Hadjipanayis, David J. Sellmyer

David Sellmyer Publications

The magnetic and structural properties of melt-spun R₈Fe₈₄Ti₈ with R=Nd, Sm, Dy, Gd and R₈ (Fe,Co) ₇₆ [V(Mo)] ₁₆ with R=Nd, Sm have been studied with x-ray diffraction, transmission electron microscopy, and magnetic measurements. The tetragonal ThMn₁₂-type structure was found in all alloys after annealing at about 700 °C. The Curie temperature (T_c) of the as-spun amorphous samples was in the range of 40–100 °C. Crystallized Nd₈ (Fe_1-xCo_x)₈₄Ti₈ samples with the 1:12 structure have a T_c around 250 °C for …

Structure And Magnetic Properties Of Nanostructured Dy/Transition-Metal Multilayered Films, Z.S. Shan, David J. Sellmyer

David Sellmyer Publications

We report the results of magnetic and microstructural studies for T/Dy (T=Fe, Co, Ni) compositionally modulated films prepared in a multiple-gun sputtering system. The perpendicular anisotropy and magnetization were measured systematically for X-Å Fe/Y-Å Dy and X-Å Co/Y-Å Dy films. The layer-thickness dependence of the magnetization for Co/Dy and Fe/Dy was interpreted in terms of the antiparallel coupling between transition-metal and Dy magnetic moments. For Co/Dy films the ranges of X and Y required for perpendicular anisotropy were determined. A comparision of the structural and magnetic properties of Ni/Dy, Co/Dy, and Fe/Dy is given and the origin of the perpendicular …

Magnetic And Structural Properties Of Nd2Fe14B Permanent-Magnet Films And Multilayers With Fe And Ag, K.D. Aylesworth, Z.R. Zhao, David J. Sellmyer, George C. Hadjipanayis

David Sellmyer Publications

The effects of sputtering conditions on the structure and magnetic properties of Nd₂ (Fe_0.9Co_0.1)₁₄B films and multilayers are reported. The samples were sputtered onto temperature-controlled mica and Ta substrates, at temperatures between 20 and 620 °C. X-ray diffraction results indicate that films deposited directly onto 500–600 °C substrates with Fe buffer layers are nearly single-phase materials with the c axis of the grains largely perpendicular to the film plane. Room-temperature magnetization measurements to 17.4 kOe indicate that these films have strong perpendicular anisotropy with coercivities in excess of 10 kOe and magnetizations greater …

Approximation Methods For Algebraic Curves And Surfaces, Chandrajit L. Bajaj

Department of Computer Science Technical Reports

No abstract provided.

Electronic Structure And Surface Reactivity Of Nd2Fe14B And Related Compounds, Sitaram Jaswal, Marjorie Langell, Y.G. Ren, M.A. Engelhardt, David J. Sellmyer

David Sellmyer Publications

Studies of electronic and magnetic structure and surface reactivity are reported for R₂T₁₄B compounds where R=Y, Nd, Gd, and T=Fe, Co. The calculations employed the self-consistent, spin-polarized linear-muffin-tin orbital method. Experiments included ultraviolet, x-ray, and Auger electron spectroscopy. Comparisons are made between the calculated and measured electronic densities of states, and the reactions of the surfaces with O₂, H₂, and CO gases are studied. The effects of heat treatment on surface segregation are also reported. Journal of Applied Physics is copyrighted by The American Institute of Physics.

Ferromagnetism In Metastable 304 Stainless Steel With Bcc Structure, J. Childress, Sy_Hwang Liou, C.L. Chien

Sy-Hwang Liou Publications

We have studied the consequence of structure on the magnetic properties of 304 stainless steel in two distinct crystalline states. Ordinary 304 stainless steel has an fcc structure and is nonmagnetic at room temperature. By using a vapor quenching method, we have fabricated single-phase metastable bcc 304 stainless steel which is strongly ferromagnetic. Films a few µm thick have been made by high-rate sputter deposition onto substrates at room temperature or liquid-nitrogen temperature. Vibrating sample magnetometry and ⁵⁷Fe Mössbauer spectroscopy reveal that the bcc phase has a magnetization of 130 emu/g, due largely to the Fe moment. The Curie …

Transport Critical Current And Magnetization Measurements Of Melt-Processed Yba2cu3o7-X, A. H. Hermann, Z. Z. Sheng, W. Kiehl, D. Marsh, A. Elali, Paul D. Hambourger, C. Almasan, J. Estrada, T. Datta

Physics Faculty Publications

We report magnetic field dependence of the transport critical current and dc magnetic susceptibility measurements on YBa2Cu3O7−x superconductors formed by melt-solid reactions at 950 °C between Ba-Cu-O (or Tb-Ba-Cu-O) and solid nonstoichiometric Y-Ba-Cu-oxide. Four-probe dc critical current measurements at 77, 64, and 4.2 K show strong depression of the critical current density with increasing magnetic field in agreement with a model of weakly linked superconducting regions. Diamagnetic shielding and Meissner flux expulsion measurements in the temperature range 10–300 K show about one third volume fraction of perfect superconductivity. Both shielding and flux expulsion were observed to be approximately temperature independent …

Embedding Complete Binary Trees Into Butterfly Networks, Ajay K. Gupta, Susanne E. Hambrusch

Department of Computer Science Technical Reports

No abstract provided.

On Computing Longest Common Subsequences In Linear Space, A. Apostolico, S. Browne, C. Guerra

Department of Computer Science Technical Reports

No abstract provided.

On The Geometry Of Dupin Cyclides, V. Chandru, D. Dutta, Christoph M. Hoffmann

Department of Computer Science Technical Reports

No abstract provided.

The Ipe-Pc Integrated Programming Environment, Nurcan Coskun, Thomas J. Sager

Computer Science Technical Reports

An Integrated Programming Environment, IPE-PC, that supports pseudo-code development has been designed and implemented. This environment is based on a Pascal-like language which is designed according to the requirements of a language-based environment. The nucleus of IPE-PC is a language-based editor which represents programs as graphs internally. The same representation is used in every mode of the environment (i.e., editing, compilation, execution, debugging and translation). The system provides facilities to take advantage of both top-down and bottom-up programming. Stepwise refinement has been supported by providing comment structures that can be transformed into procedures. Bottom-up programming is supported because it is …

Polymer Science In Czechoslovakia Ii: Universities In The Czech Socialist Republic, Otto Vogl, Jaroslav Kralicek, Miroslav Schatz, Petr Vondracek

Emeritus Faculty Author Gallery

No abstract provided.

31st International Congress Of Pure And Applied Chemistry, Sofia, Bulgaria,1987, Otto Vogl, Ivan Shopov, Ivan Panayotov

Emeritus Faculty Author Gallery

No abstract provided.

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, November 1988, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A fourteen page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

Bringing Software Under Statistical Quality Control, Harlan D. Mills, J. H. Poore

The Harlan D. Mills Collection

No abstract provided.