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Apocalypse Now, Roy Gane Apr 1997

Apocalypse Now, Roy Gane

Faculty Publications

No abstract provided.

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A Soil-Canopy-Atmosphere Model For Use In Satellite Microwave Remote Sensing, Venkataraman Lakshmi, Eric F. Wood, Bhaskar J. Choudhury Mar 1997

A Soil-Canopy-Atmosphere Model For Use In Satellite Microwave Remote Sensing, Venkataraman Lakshmi, Eric F. Wood, Bhaskar J. Choudhury

Faculty Publications

Regional and global scale studies of land-surface-atmosphere interactions require the use of observations for calibration and validation. In situ field observations are not representative of the distributed nature of land surface characteristics, and large-scale field experiments are expensive undertakings. In light of these requirements and shortcomings, satellite observations serve our purposes adequately. The use of satellite data in land surface modeling requires developing a hydrological model with a thin upper layer to be compatible with the nature of the satellite observations and that would evaluate the soil moisture and soil temperature of a thin layer close to the surface. This …

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Matroids Arisen From Matrogenic Graphs, Guoli Ding, Peter L. Hammer Mar 1997

Matroids Arisen From Matrogenic Graphs, Guoli Ding, Peter L. Hammer

Faculty Publications

Let G be a finite simple graph and let ℐ(G) be the set of subsets X of V(G) such that the subgraph of G induced by X is threshold. If ℐ(G) is the independence system of a matroid, then G is called matrogenic [3]. In this paper, we characterize matroids arising from matrogenic graphs.

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Wetland Loss In The Northern Gulf Of Mexico: Multiple Working Hypotheses, R. Eugene Turner Mar 1997

Wetland Loss In The Northern Gulf Of Mexico: Multiple Working Hypotheses, R. Eugene Turner

Faculty Publications

I examined four hypotheses about causes for the dramatically high coastal wetland losses (0.86% yr−1) in the northern Gulf of Mexico: an extensive dredged canal and spoil bank network, a decline in sediments in the Mississippi River during the 1950s, Mississippi River navigation and flood protection levees, and salinity changes. Natural factors contributing to these habitat changes include eustatic sea-level rise and geological compaction, which appear to have remained relatively constant this century, although variation does occur. These four hypotheses were tested using data on land-to-water changes in 15-min quadrangle maps inventoried for four intervals between the 1930s and 1990. …

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Dynamic Correlations In Porous Media, J.C. Lee Feb 1997

Dynamic Correlations In Porous Media, J.C. Lee

Faculty Publications

When binary liquid mixtures are infused into various random porous media, past experiment have shown that different media affect the dynamic correlations of concentration fluctuations in different ways. Vycor glasses of relatively small pore size and dilute gels allow the exponential bulk mode to remain in the final ensemble average, but Vycor glasses of vary large pore size do not. We take this to mean that the relaxation time of the bulk mode is spatialIy homogeneous in the two former media but heterogeneous in the latter media. Thus we search for a heterogeneous dynamic mode with an Ising model. We …

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Teaching Electromagnetic Field Theory Using Differential Forms, Karl F. Warnick, Richard H. Selfridge, David V. Arnold Feb 1997

Teaching Electromagnetic Field Theory Using Differential Forms, Karl F. Warnick, Richard H. Selfridge, David V. Arnold

Faculty Publications

The calculus of differential forms has significant advantages over traditional methods as a tool for teaching electromagnetic (EM) field theory. First, films clarify the relationship between field intensity and flux density, by providing distinct mathematical and graphical representations for the two types of fields. Second, Ampere's and Faraday's laws obtain graphical representations that are as intuitive as the representation of Gauss's law. Third, the vector Stokes theorem and the divergence theorem become special cases of a single relationship that is easier for the student to remember, apply, and visualize than their vector formulations. Fourth, computational simplifications result from the use …

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Analytical Models For Vehicle/Gap Distribution On Automated Highway Systems, Jacob Tsao, Randolph W. Hall, Indrajit Chatterjee Jan 1997

Analytical Models For Vehicle/Gap Distribution On Automated Highway Systems, Jacob Tsao, Randolph W. Hall, Indrajit Chatterjee

Faculty Publications

Highway congestion has in recent years become a pervasive problem for urban and suburban areas alike. The concept of Automated Highway Systems is based on the belief that integration of sensing, communication, and control technologies into vehicles and highways can lead to a large improvement in capacity and safety without requiring a significant amount of additional highway right-of-way. A fundamental determinant of Automated Highway Systems capacity is the vehicle-following rule, the rule that governs the behavior of vehicles traveling along a common lane (e.g., the spacing between any two longitudinally adjacent vehicles). Vehicle following affects the longitudinal capacity (achievable flow …

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Anomalous Flow Profile Due To The Curvature Effect On Slip Length, Alejandro Garcia, K. Tibbs, F. Baras Jan 1997

Anomalous Flow Profile Due To The Curvature Effect On Slip Length, Alejandro Garcia, K. Tibbs, F. Baras

Faculty Publications

No abstract provided.

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Structural And Dynamical Uncertainties In Modelling Axisymmetric Elliptical Galaxies, Aaron J. Romanowsky, C. S. Kochanek Jan 1997

Structural And Dynamical Uncertainties In Modelling Axisymmetric Elliptical Galaxies, Aaron J. Romanowsky, C. S. Kochanek

Faculty Publications

Quantitative dynamical models of galaxies require deprojection of the observed surface brightness to determine the luminosity density of the galaxy. Existing deprojection methods for axisymmetric galaxies assume that a unique deprojection exists for any given inclination, even though the projected density is known to be degenerate to the addition of ‘konus densities’ that are invisible in projection. We develop a deprojection method based on linear regularization that can explore the range of luminosity densities that are statistically consistent with an observed surface brightness distribution. The luminosity density is poorly constrained at modest inclinations (i ≿ 30°), even in the limit …

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Advice For Religious Historians: On The Myth Of A Purely Historical Jesus, Alan G. Padgett Jan 1997

Advice For Religious Historians: On The Myth Of A Purely Historical Jesus, Alan G. Padgett

Faculty Publications

No abstract provided.

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Sodium Nitrite Alone Protects The Brain O _I_ Microsomal Ca -Atpase Against Potassium Cyanide-Induced Neurotoxicity In Rats, Odutayo O. Odunuge, G.. A. Adenuga Jan 1997

Sodium Nitrite Alone Protects The Brain O _I_ Microsomal Ca -Atpase Against Potassium Cyanide-Induced Neurotoxicity In Rats, Odutayo O. Odunuge, G.. A. Adenuga

Faculty Publications

The effect of a short-term oral administration of potassium cyanide (KCN) (200 ppm in diet) with or without sodium nitrite (NaNO2) pretreatment on rat brain microsomal Ca2* ATPase was investigated. The specific activity value of the enzyme significantly decreased (p<0.05) by 50% compared with control and by 63% for KCN-treated rats compared with KCN-treated rats pretreated with NaNO;,. There was no significant difference at the h = 0.05 level between the values obtained for the control and KCN-treated rats pretreated with NaNO,. These results show both that feeding lowers brain microsomal Ca2f-ATPase activity and that NaNO, has a protective role (antidote function) in that respect.

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The Economics Of Hardwood Management In The United States: 1950-1995, An Annotated Bibliography, Steven J. Goodson, Steven H. Bullard Jan 1997

The Economics Of Hardwood Management In The United States: 1950-1995, An Annotated Bibliography, Steven J. Goodson, Steven H. Bullard

Faculty Publications

This bibliography includes journal articles, published reports, conference proceedings articles, and academic theses and dissertations dated between 1950 and 1995 that concern economic aspects of managing hardwood tree species for timber production in the United States. The articles and reports were identified through keyword searches of computer databases available through the Mississippi State University computer system. Keywords used included individual species names as well as economic terms such as costs, returns, investment, and profit. The specific databases included the 1) USDA Agricultural Library - AGRICOLA CD-ROMs, 2) Colorado Alliance of Research Libraries System, 3) EBSCO Dissertation Abstracts, and 4) the …

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Manufacturing Upholstered Furniture In The Southeastern U.S.: A Comparative Cost Assessment, Joshua O. Idassi, Steven H. Bullard Jan 1997

Manufacturing Upholstered Furniture In The Southeastern U.S.: A Comparative Cost Assessment, Joshua O. Idassi, Steven H. Bullard

Faculty Publications

The upholstered household furniture industry (SIC 25 12) is extremely important in the economies of Alabama, Mississippi, North Carolina, and Tennessee. This study uses a comparative cost approach to assess the differences that exist in the manufacturing and distribution of upholstered wood household furniture among southeast U.S. states. Secondary data for raw material, labor, and transportation costs were obtained from the U.S. Department of Commerce, Bureau of the Census, for 1982, 1987, and 1992. Total costs were estimated for raw material, labor, and transportation of the finished products. A simple cost index was constructed for each cost component. Analysis of …

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The Influence Of Decision Aids On User Behavior: Implications For Knowledge Acquisition And Inappropriate Reliance, Steven M. Glover, Douglas F. Prawitt, Brian C. Spilker Jan 1997

The Influence Of Decision Aids On User Behavior: Implications For Knowledge Acquisition And Inappropriate Reliance, Steven M. Glover, Douglas F. Prawitt, Brian C. Spilker

Faculty Publications

Structured decision aids are widely used in many organizational settings, and their influence on judgment consistency and accuracy have received considerable attention in the literature. While two benefits commonly associated with decision aid use are improved judgment and enhanced expertise development, relatively little attention has been directed toward the potential influence of decision aids on decision maker behavior. In particular, we argue that the use of structured aids may influence relatively inexperienced decision makers to approach aided tasks mechanistically, without becoming actively involved in the task or judgment. Such passive decision behavior may, in some situations, threaten gains in performance …

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The Ability Of Children With Specific Language Impairment To Participate In A Group Decision Task, Lee Robinson, Martin Fujiki, Bonnie Brinton, Valyne J. Watson Jan 1997

The Ability Of Children With Specific Language Impairment To Participate In A Group Decision Task, Lee Robinson, Martin Fujiki, Bonnie Brinton, Valyne J. Watson

Faculty Publications

This study examined the ability of 6 children with specific language impairment (SLI), ages 8:10 to 12:5 (years; months), to participate in a group negotiation task. Each child interacted with two peers to select toys that children their age would enjoy. Performance was compared to both chronological age-similar (CS) peers and language similar (LS) peers performing the same task. Analyses of the resulting interactions indicated that subjects with SLI produced significantly fewer utterances than the other children in the triad. Similar differences were not observed in the CS or LS triads. Additionally, significantly fewer utterances were addressed to the children …

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Reasonable Accommodations And Awkward Compromises: Issues Concerning Learning Disabled Students And Professional Schools In The Law School Context, Lisa A. Eichhorn Jan 1997

Reasonable Accommodations And Awkward Compromises: Issues Concerning Learning Disabled Students And Professional Schools In The Law School Context, Lisa A. Eichhorn

Faculty Publications

Under the Americans with Disabilities Act of 1990 and Section 504 of the Rehabilitation Act of 1973, colleges and universities are prohibited from discriminating against qualified students with learning disabilities and must reasonably accommodate such disabilities so that students have a genuine opportunity to complete academic programs successfully. Not surprisingly, just like their non-disabled peers, a number of learning disabled college graduates are choosing to enter professions such as law and medicine. Their entry into professional schools has raised a number of legal issues concerning their qualification to matriculate, their need for accommodations, and their eventual ability to practice successfully. …

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Legitimacy And The Useful Arts, Craig Allen Nard Jan 1997

Legitimacy And The Useful Arts, Craig Allen Nard

Faculty Publications

The fundamental question this Article addresses is who should be primarily responsible for making patent validity determinations: the courts5 or the Patent and Trademark Office (“PTO”)?6 Which entity *517 would best serve the constitutional goal of promoting the progress of the useful arts?

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A Geometric Method For Location Of Gravitational Wave Sources, Nadja S. Magalhães, Warren W. Johnson, Carlos Frajuca, Odylio D. Aguiar Jan 1997

A Geometric Method For Location Of Gravitational Wave Sources, Nadja S. Magalhães, Warren W. Johnson, Carlos Frajuca, Odylio D. Aguiar

Faculty Publications

We show that the interaction of a gravitational wave with a spherical resonant-mass antenna changes the antenna's shape to that of an ellipsoid. These changes in shape always determine the direction of the incoming wave and may provide information on the wave's polarization. We present a new approach for determining the position of astrophysical sources of gravitational waves which involves fewer calculations than in earlier methods. We also show how the measured quantities relate to the energy density of the wave. © 1997. The American Astronomical Society. All rights reserved.

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Techniques For Detecting Gravitational Waves With A Spherical Antenna, Stephen M. Merkowitz, Warren W. Johnson Jan 1997

Techniques For Detecting Gravitational Waves With A Spherical Antenna, Stephen M. Merkowitz, Warren W. Johnson

Faculty Publications

We report the results of a theoretical and experimental study of a spherical gravitational wave antenna. We develop a number of techniques to deconvolve the data from a set of resonant transducers attached to the surface of a sphere to monitor the sphere’s five quadrupole modes. We show that by observing these modes, one can measure the five tensorial components of a gravitational wave. The inverse problem can then be solved and the direction of a gravitational wave can be determined. Asymmetries such as the nondegeneracy of the quadrupole modes and mistuning of the transducers are included in the model …

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Generation Of Attosecond Pulses In Macroscopic Media, Philippe Antoine, Dejan B. Milošević, Anne L’Huillier, Mette B. Gaarde, Pascal Salières, Maciej Lewenstein Jan 1997

Generation Of Attosecond Pulses In Macroscopic Media, Philippe Antoine, Dejan B. Milošević, Anne L’Huillier, Mette B. Gaarde, Pascal Salières, Maciej Lewenstein

Faculty Publications

We describe theoretically the generation of ultrashort (subfemtosecond) pulses using high-order harmonics of a laser pulse with a time-dependent degree of ellipticity. The single-atom response is calculated by using a low-frequency strong-field approximation. Propagation effects are taken into account using a method going beyond the slowly varying envelope approximation. Propagation modifies significantly the results obtained in the single-atom response and, in certain conditions, makes the generation of one attosecond pulse possible. We discuss prospects for the observation of these ultrashort pulses. © 1997 The American Physical Society.

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Numerical Modeling Of Self-Propagating Polymerization Fronts: The Role Of Kinetics On Front Stability, Stanislav E. Solovyov, Victor M. Llyashenko, John A. Pojman Jan 1997

Numerical Modeling Of Self-Propagating Polymerization Fronts: The Role Of Kinetics On Front Stability, Stanislav E. Solovyov, Victor M. Llyashenko, John A. Pojman

Faculty Publications

Frontal propagation of a highly exothermic polymerization reaction in a liquid is studied with the goal of developing a mathematical model of the process. As a model case we consider monomers such as methacrylic acid and n -butyl acrylate with peroxide initiators, although the model is not limited to these reactants and can be applied to any system with the similar basic polymerization mechanism. A three-step reaction mechanism, including initiation, propagation and termination steps, as well as a more simple one-step mechanism, were considered. For the one-step mechanism the loss of stability of propagating front was observed as a sequence …

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Regulation Of Root-Associated Methanotrophy By Oxygen Availability In The Rhizosphere Of Two Aquatic Macrophytes, Aram Calhoun, Gary M. King Jan 1997

Regulation Of Root-Associated Methanotrophy By Oxygen Availability In The Rhizosphere Of Two Aquatic Macrophytes, Aram Calhoun, Gary M. King

Faculty Publications

The relative importance of oxygen for root-associated methanotrophy was examined by using sediment-free, intact freshwater marsh plants (Pontederia cordata and Sparganium eurycarpum) incubated in split chambers. The root medium contained approximately 100 μM methane. Methane oxidation was calculated from the difference between methane loss from chambers in the presence and absence of 1 mM 1-allyl-2-thiourea, a methanotrophic inhibitor. When the root medium was oxic, methane oxidation accounted for 88 and 63% of the total methane depletion for S. eurycarpum and P. cordata, respectively; the remainder represented diffusional loss to the atmosphere via roots, stems, and leaves. Under suboxic conditions, methane …

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Variational Methods, Bounds, And Size Effects For Composites With Highly Conducting Interface, Robert Lipton Jan 1997

Variational Methods, Bounds, And Size Effects For Composites With Highly Conducting Interface, Robert Lipton

Faculty Publications

New variational principles are developed for the effective conductivity tensor for anisotropic two-phase electric conductors. Here the interface between phases is assumed to be highly conducting. Extra geometric information is encoded into the principles through the solution operators of simpler transport problems. These operators can be expressed as gradients of simple layer potentials with densities supported on phase interfaces or in terms of simple Dirichlet problems inside each phase region. New upper bounds on the effective conductivity are found that depend upon component volume fractions, a surface energy tensor and a scale-free matrix of parameters. This matrix corresponds to the …

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Reciprocal Relations, Bounds, And Size Effects For Composites With Highly Conducting Interface, Robert Lipton Jan 1997

Reciprocal Relations, Bounds, And Size Effects For Composites With Highly Conducting Interface, Robert Lipton

Faculty Publications

We provide a reciprocal relation linking the effective conductivity of a composite with highly conducting phase interfaces to that of a composite with the same phase geometry but with an electrical contact resistance at phase interfaces. A field relationship linking the electric field inside a composite with highly conducting phase interfaces to the current in a composite with contact resistance between phases is found. New size effects exhibited by isotropic particulate suspensions with highly conducting interface are obtained. The effective properties of periodic composites are shown to be monotonically increasing as the size of the period cell tends to zero. …

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A Construction Of Representations Of Affine Weyl Groups, D. S. Sage Jan 1997

A Construction Of Representations Of Affine Weyl Groups, D. S. Sage

Faculty Publications

Let G be a complex, semisimple, simply connected algebraic group with Lie algebra g. We extend scalars to the power series field in one variable C((π)), and consider the space of Iwahori subalgebras containing a fixed nil-elliptic element of g ⊗ C((π)), i.e. fixed point varieties on the full affine flag manifold. We define representations of the affine Weyl group in the homology of these varieties, generalizing Kazhdan and Lusztig's topological construction of Springer's representations to the affine context.

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Does The Jones Polynomial Detect Unknottedness?, Oliver T. Dasbach, Stefan Hougardy Jan 1997

Does The Jones Polynomial Detect Unknottedness?, Oliver T. Dasbach, Stefan Hougardy

Faculty Publications

There have been many attempts to settle the question whether there exist nontrivial knots with trivial Jonespolynomial. In this paper we show that such a knot must have crossing number at least 18. Furthermore we give the number of prime alternating knots and an upper bound for the number of prime knots up to 17 crossings. We also compute the number of different HOMFLY, Jonesand Alexander polynomials for knots up to 15 crossings. © A K Peters, Ltd.

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Lattice Knot Theory And Quantum Gravity In The Loop Representation, Hugo Fort, Rodolfo Gambini, Jorge Pullin Jan 1997

Lattice Knot Theory And Quantum Gravity In The Loop Representation, Hugo Fort, Rodolfo Gambini, Jorge Pullin

Faculty Publications

We present an implementation of the loop representation of quantum gravity on a square lattice. Instead of starting from a classical lattice theory, quantizing, and introducing loops, we proceed backwards, setting up constraints in the lattice loop representation and showing that they have appropriate (singular) continuum limits and algebras. The diffeomorphism constraint reproduces the classical algebra in the continuum and has as solutions lattice analogues of usual knot invariants. We discuss some of the invariants stemming from Chern-Simons theory in the lattice context, including the issue of framing. We also present a regularization of the Hamiltonian constraint. We show that …

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Semiclassical Approach To The Hydrogen-Exchange Reaction Reactive And Transition-State Dynamics, Sophya V. Garashchuk, F. Grossmann, D. Tannor Jan 1997

Semiclassical Approach To The Hydrogen-Exchange Reaction Reactive And Transition-State Dynamics, Sophya V. Garashchuk, F. Grossmann, D. Tannor

Faculty Publications

Scattering matrix elements and symmetric transition-state resonances for the collinear H 2 + H → H + H 2 reaction are obtained using a time-dependent approach. The correlation function between reactant channel wavepackets and product channel wavepackets is used to determine the S-matrix elements. In a similar fashion, autocorrelation functions are used to extract the positions and widths of transition-state resonances. The time propagation of the wavepackets is performed by the improved semiclassical frozen Gaussian method of Herman and Kluk, which is an initial value, uniformly converged method. The agreement between the quantum and semiclassical results is far better …

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Semiclassical Approach To The Hydrogen-Exchange Reaction- Reactive And Transition-State Dynamics, Sophya V. Garashchuk, Grossmann Frank, David Tannor Jan 1997

Semiclassical Approach To The Hydrogen-Exchange Reaction- Reactive And Transition-State Dynamics, Sophya V. Garashchuk, Grossmann Frank, David Tannor

Faculty Publications

Scattering matrix elements and symmetric transition-state resonances for the collinear H 2 + H → H + H 2 reaction are obtained using a time-dependent approach. The correlation function between reactant channel wavepackets and product channel wavepackets is used to determine the S-matrix elements. In a similar fashion, autocorrelation functions are used to extract the positions and widths of transition-state resonances. The time propagation of the wavepackets is performed by the improved semiclassical frozen Gaussian method of Herman and Kluk, which is an initial value, uniformly converged method. The agreement between the quantum and semiclassical results is far better …

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Wards Cove Packing Or Not Wards Cove Packing? That Is Not The Question: Some Thoughts On Impact Analysis Under The Age Discrimination In Employment Act, Mack Player Jan 1997

Wards Cove Packing Or Not Wards Cove Packing? That Is Not The Question: Some Thoughts On Impact Analysis Under The Age Discrimination In Employment Act, Mack Player

Faculty Publications

No abstract provided.

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