Digital Commons Network^™

On Stationary And Moving Interface Cracks With Frictionless Contact In Anisotropic Bimaterials, Xiaomin Deng

Faculty Publications

The asymptotic structure of near-tip fields around stationary and steadily growing interface cracks, with frictionless crack surface contact, and in anisotropic bimaterials, is analysed with the method of analytic continuation, and a complete representation of the asymptotic fields is obtained in terms of arbitrary entire functions. It is shown that when the symmetry, if any, and orientation of the anisotropic bimaterial is such that the in-plane and out-of-plane deformations can be separated from each other, the in-plane crack-tip fields will have a non-oscillatory, inverse-squared-root type stress singularity, with angular variations clearly resembling those for a classical mode II problem when …

Observation Of Events With A Large Rapidity Gap In Deep Inelastic Scattering At Hera, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, S. Repond, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, C. Del Papa, F. Frasconi, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, Q. Lin

Faculty Publications

In deep inelastic, neutral current scattering of electrons and protons at s=296 GeV, we observe in the ZEUS detector events with a large rapidity gap in the hadronic final state. They occur in the region of small Bjorken x and are observed up to Q2 of 100 GeV2. They account for about 5% of the events with Q2≥10 GeV2. Their general properties are inconsistent with the dominant mechanism of deep inelastic scattering, where color is transferred between the scattered quark and the proton remnant, and suggest that the underlying production mechanism is the diffractive dissociation of the virtual photon. © …

Public Administrative Behavior And Complexity: A Preliminary Model With Applications, Barbara Romzek, Melvin J. Dubnick

Faculty Publications

The document discusses the development of a middle-range theory of public administrative behavior centered on adaptation, environment, and complexity.

Criminal Discovery In Oklahoma: A Call For Legislative Action, Rodney J. Uphoff

Faculty Publications

This article first explores the Allen decision and the extent to which Allen changed the law of criminal discovery in Oklahoma. Next, the article examines some of the theoretical and practical problems with the Allen procedures as well as the efforts of the Oklahoma Court of Criminal Appeals to address some of the troublesome questions generated by Allen. Finally, the article discusses the need to replace the Allen provisions with a legislative framework that facilitates pretrial access to information and minimizes “trial ambush,” but without compromising the fair and efficient operation of the adversary system.

Declarative Representations Of Multiagent Systems, Munindar P. Singh, Michael N. Huhns, Larry M. Stevens

Faculty Publications

This paper explores the specification and semantics of multiagent problem-solving systems, focusing on the representations that agents have of each other. It provides a declarative representation for such systems. Several procedural solutions to a well-known test-bed problem are considered, and the requirements they impose on different agents are identified. A study of these requirements yields a representational scheme based on temporal logic for specifying the acting, perceiving, communicating, and reasoning abilities of computational agents. A formal semantics is provided for this scheme. The resulting representation is highly declarative, and useful for describing systems of agents solving problems reactively.

Coordinated Intelligent Control Via Epistemic Utility Theory, Wynn C. Stirling

Faculty Publications

An approach to local reactive coordinated intelligent control based on the concept of an epistemic system, together with a principle of action that may be exercised locally, is presented. An epistemic system provides a mechanism for agents to characterize their knowledge corpora, options, goals, and beliefs. Levi's rule of epistemic utility provides a principle of action for decision making by comparing the informational value of rejection with the belief of correctness. Decisions are made locally and reactively, rather than globally. Coordination is implemented between agents by sharing and learning the epistemic systems of other agents. The resulting coordination model is …

Rsvp: A New Resource Reservation Protocol, Daniel Zappala, Stephen Deering, Deborah Estrin, Scott Shenker, Lixia Zhang

Faculty Publications

The current Internet architecture, embodied in the Internet Protocol (IP) network protocol, offers a very simple service model: point-to-point best-effort service. In recent years, several new classes of distributed applications have been developed, such as remote video, multimedia conferencing, data fusion, visualization, and virtual reality. It is becoming increasingly clear that the Internet’s primitive service model is inadequate for these new applications. This inadequacy stems from the failure of the point-to-point best-effort service model to address two application requirements. First, many of these applications are very sensitive to the quality of service their packets receive. For a network to deliver …

Networking Your Cd-Roms: A Texas Tale, Margaret Sylvia

Faculty Publications

Installation of a CD-ROM network at St. Mary's University Academic Library created a revolution in the way students and faculty do research.

Greenland Ice Core “Signal” Characteristics: An Expanded View Of Climate Change, Paul A. Mayewski, L. David Meeker, Michael C. Morrison, Mark S. Twickler, Sallie I. Whitlow, Kevin K. Ferland, Debra A. Meese, M. R. Legrand, J. P. Steffensen

Faculty Publications

The last millenium of Earth history is of particular interest because it documents the environmental complexities of both natural variability and anthropogenic activity. We have analyzed the major ions contained in the Greenland Ice Sheet Project 2 (GISP 2) ice core from the present to ∼674 A.D. to yield an environmental reconstruction for this period that includes a description of nitrogen and sulfur cycling, volcanic emissions, sea salt and terrestrial influences. We have adapted and extended mathematical procedures for extracting sporadic (e.g., volcanic) events, secular trends, and periodicities found in the data sets. Finally, by not assuming that periodic components …

Low‐Cost Technique For Preparing N‐Sb2S3/P‐Si Heterojunction Solar Cells, O. Savadogo, K. C. Mandal

Faculty Publications

No abstract provided.

High-Order Harmonic Generation With Short-Pulse Lasers, Kenneth J. Schafer, Jeffrey L. Krause, Kenneth C. Kulander

Faculty Publications

Recent progress in the understanding of high-order harmonic conversion from atoms and ions exposed to high-intensity, short-pulse optical lasers is reviewed. We find that ions can produce harmonics comparable in strength to those obtained from neutral atoms, and that the emission extends to much higher order. Simple scaling laws for the strength of the harmonic emission and the maximum observable harmonic are suggested. These results imply that the photoemission observed in recent experiments in helium and neon contains contributions from ions as well as neutrals.

Three Points Of Great Height On Elliptic Curves, Andrew Bremner, Duncan A. Buell

Faculty Publications

We give three elliptic curves whose generators have great height, demonstrating along the way a moderately efficient method for finding such points.

Frontier Democracy: The Turner Thesis Revisited, Lacy K. Ford, Jr.

Faculty Publications

No abstract provided.

Congressional Procedure And Statutory Interpretation, Larry Evans, Jarrell Wright, Neal Devins

Faculty Publications

No abstract provided.

A Probabilistic Model And A Software Tool For Avcs Longitudinal Collision/Safety Analysis, H.-S. Jacob Tsao, Randolph Hall

Faculty Publications

This paper develops a probabilistic model and a software tool for analyzing longitudinal collision/safety between two automated vehicles. The input parameters are the length of the gap between the two vehicles, the common speed prior to the failure, the reaction delay of the following vehicle and a bivariate pint distribution of the deceleration rates of the two vehicles. The output includes the probability of a collision and also the probability distribution of the relative speed at collision time.We will use this model to compare the safety consequences associated with the platooning and "free-agent" vehicle-following rules. We will also demonstrate that …

Building A Gateway For The Cd-Rom Network: A Step Toward The Virtual Library With The Virtual Microsystems V-Server, Margaret Sylvia

Faculty Publications

Describes one college library's experience with a gateway for dial-in access to its CD-ROM network to increase access to automated index searching for students off-campus. Hardware and software choices are discussed in terms of access, reliability, affordability, and ease of use. Installation problems are discussed, and an appendix lists product information.

An Exploration Of High-Risk Leisure Consumption Through Skydiving, Richard L. Celsi, Randall L. Rose, Thomas W. Leigh

Faculty Publications

A sociocultural approach is used to explore voluntary high-risk consumption Specifically, we examine the dynamics of individuals' motives, risk perceptions, and benefit/cost outcomes of participation in increasingly popular high-risk leisure activities such as skydiving, climbing, and BASE jumping (parachuting from fixed objects). An ethnography of a skydiving subculture provides the primary empirical data. We propose an extended dramatic model that explains both macroenvironmental and inter- and intrapersonal influences and motives for high-risk consumption. Key findings indicate (1) an evolution of motives that explains initial and continuing participation in high-risk activities and (2) a coinciding evolution of risk acculturation that leads …

Effects Of Crosstalk On Fidelity In Page-Oriented Volume Holographic Optical Data Storage, Gregory P. Nordin, P. Asthana

Faculty Publications

Using numerical simulation, we quantitatively examine the effects of cross talk on the recall fidelity of stored binary data in a page-oriented volume holographic memory system. We discuss the trade-off between the signal-to-noise ratio of the reconstructed bits and the optical throughput of the system (i.e., the fraction of the incident beam that is diffracted to the detector plane). We show that significant gains in the signal-to-noise ratio can be achieved with modest decreases in optical throughput in the region where the highest throughput occurs. The magnitude of this trade-off is influenced by both beam degeneracy and coherent recording cross …

Development Of New Methods For Assessing Solidification/Stabilization Of Hazardous Waste Using Solid-State Nuclear Magnetic Resonance Techniques (Ph.D Dissertation, Lsu), Michael A. Janusa

Faculty Publications

New methods for assessing solidification/stabilization (S/S) of hazardous waste using solid-state nuclear magnetic resonance are developed for the purpose of diagnosing on a microscopic level the performance of S/S as a hazardous waste disposal technique. There are four techniques developed and described in this dissertation: (1) Solid-state deuterium NMR spectroscopy is used to determine if a particular deuterated organic waste is effectively solidified/stabilized and to determine the lower limit of the bond strength between the waste and the cement matrix; (2) Constant time pulsed field gradient ^ NMR spectroscopy is tested on a liquid waste encapsulated within a solidified matrix …

Resolution Enhancement Of Spaceborne Scatterometer Data, David G. Long, Perry J. Hardin, Peter T. Whiting

Faculty Publications

A method for generating enhanced resolution radar images of the Earth's surface using spaceborne scatterometry is presented. The technique is based on an image reconstruction technique that takes advantage of the spatial overlap in scatterometer measurements made at different times to provide enhanced imaging resolution. The reconstruction algorithm is described, and the technique is demonstrated using both simulated and actual Seasat-A Scatterometer (SASS) measurements. The technique can also be used with ERS-1 scatterometer data. The SASS-derived images, which have approximately 4-km resolution, illustrate the resolution enhancement capability of the technique, which permits utilization of both historic and contemporary scatterometer data …

Initial Study Of Deep Inelastic Scattering With Zeus At Hera, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, S. Repond, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Barbagli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, C. Del Papa, F. Frasconi, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi

Faculty Publications

Results are presented on neutral current, deep inelastic scattering measured in collisions of 26.7 GeV electrons and 820 GeV protons. The events typically populate a range in Q2 from 10 to 100 GeV2. The values of x extend down to x ∼ 10-4 which is two orders of magnitude lower than previously measured at such Q2 values in fixed target experiments. The measured cross sections are in accord with the extrapolations of current parametrisations of parton distributions. © 1993.

Creating An Expert System For Legislative History Research: Project Clear's 'Lexpert', I. Trotter Hardy

Faculty Publications

Professor Hardy describes techniques that help to automate the creation of Lexpert, an expert system for giving advice about legislative history research.

Analysis Of Weighted Fan-Out/Fan-In Volume Holographic Interconnections, Gregory P. Nordin, P. Asthana, B. Keith Jenkins, A. R. Tanguay

Faculty Publications

The feasibility of employing volume holographic techniques for the implementation of highly multiplexed weighted fan-out/fan-in interconnections is analyzed on the basis of interconnection fidelity, optical throughput, and complexity of recording schedule or implementation hardware. These feasibility criteria were quantitatively evaluated using the optical beam propagation method to numerically simulate the diffraction characteristics of volume holographic interconnections recorded in a linear holographic material. We find that conventional interconnection architectures (that are based on a single coherent optical source) exhibit a direct trade-off between interconnection fidelity and optical throughput on the one hand, and recording schedule or hardware complexity on the other. …

King On King Lear: Finding Virtue In Minute Particulars, A. Jane Birch

Faculty Publications

“The social sciences should not exist. And I'm grateful that there are people in the social sciences working to destroy them.” This statement might easily be dismissed as rash and unjustified were the author not a world-class scholar, the quality of whose life-long study serves as an invitation to consider his reasons for making such a declaration. If, in the end, we cannot concur with Dr. Arthur Henry King's verdict on the ultimate value of the social sciences, might not his analysis of its problems give us a new perspective from which we might reevaluate it? Perhaps there is something …

Rethinking Writing - Kuriloff, Pc, Evelyn Ashton-Jones

Faculty Publications

No abstract provided.

Carbon, Nitrogen, And Phosphorus Leaching Rates From Spartina Alterniflora Salt Marshes, R. Eugene Turner

Faculty Publications

Annual carbon, nitrogen, and phosphorus leachate rates from live Spartina alterniflora Loisel in a Louisiana (USA) salt marsh were estimated to be 200, 14, and 3 g m-2, respectively, and to peak in summer and higher salinit~es. Leachate losses of P, N and C are equivalent to a turnover of live plant tissues of 10, 17 and 49 d, respectively, when submerged, and 148, 250 and 721 d, respectively, when unsubmerged. Plant leachate losses during marsh submergence and non-submergence are nearly equal because release rates are 15x greater during submergence. Nitrogen and carbon concentrations relative to phosphorus are proportionately 4x …

Empirical Implications For Small Business Drug Policies, Donald R. Curtis, Dillard Tinsley, Geralyn Mcclure Franklin

Faculty Publications

The results of empirical studies of small and large businesses parallel each other regarding the characteristics of drug policies. Drug policies affect organizational performance, including improved productivity and reduced accidents. EAPs are an effective approach to drug policies. and outside contractors are common sources of information and services. Pre-employment testing is usually combined with other types of testing, but careful attention is needed to meet legal requirements. Employees with positive tests may cause difficulties, but, overall. employee morale rises. Small businesses without drug policies are increasing their competitive risks.

Basic Concepts In Forest Valuation And Investment Analysis, Steven H. Bullard, Thomas J. Straka

Faculty Publications

The current edition 3.0 can be found at the following location:

Bullard, Steven H. and Straka, Thomas J., "Basic Concepts in Forest Valuation and Investment Analysis" (2011) eBooks http://scholarworks.sfasu.edu/ebooks/21

This book was originally intended to supplement lectures in forestry economics at the undergraduate level. At Mississippi State University, for example, these materials are currently used in one of the eleven major topics included in a one-semester course titled 'Forest Resource Economics.' It is also intended, however, that the book will serve as a basic reference for foresters with experience in valuation concepts and terminology. It has proven to be a …

Quantam Wave Turbulence, Alejandro Garcia, M. Haeri, S. Putterman, P. Roberts

Faculty Publications

The nonlinear quantum kinetic equation for the interaction of sound waves is solved via analytic and numerical techniques. In the classical regime energy cascades to higher frequency (ω) according to the steady-state power law ω-3/2. In the quantum limit, the system prefers a reverse cascade of energy which follows the power law ω-6. Above a critical flux, a new type of spectrum appears which is neither self-similar nor close to equilibrium. This state of nonlinear quantum wave turbulence represents a flow of energy directly from the classical source to the quantum degrees of freedom.

Solid-State Deuterium Nmr Spectroscopy Of D5-Phenol In White Portland Cement: A New Method For Assessing Solidification/Stabilization, Michael A. Janusa

Faculty Publications

We have developed a new NMR-based procedure for studying waste/cement interactions. This is the first use of deuterium NMR spectroscopy to study waste solidification/ stabilization (S/S). The main feature of deuterium NMR spectroscopy is the ability to monitor molecular reorientations over a wide range of reorientation rates. This technique allows one to determine if a particular deuterated organic waste is effectively solidified/ stabilized and to determine the lower limit of the bond strength between the waste and the cement matrix. Comparison of the predicted and experimental deuterium NMR spectra show that phenol is mainly dissolved in pore waters and, thus, …