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Faculty Publications

1992

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Observation Of Hard Scattering In Photoproduction At Hera, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, K. Sugano, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayed, G. Barbagli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, 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 Dec 1992

Observation Of Hard Scattering In Photoproduction At Hera, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, K. Sugano, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayed, G. Barbagli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, 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

We report a study of electron proton collisions at very low Q2, corresponding to virtual photoproduction at centre of mass energies in the range 100-295 GeV. The distribution in transverse energy of the observed hadrons is much harder than can be explained by soft processes. Some of the events show back-to-back two-jet production at the rate and with the characteristics expected from hard two-body scattering. A subset of the two-jet events have energy in the electron direction consistent with that expected from the photon remnant in resolved photon processes. © 1992.

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Denitrification And Oxygen Consumption In Sediments Of Two South Texas Estuaries, Won Bae Yoon, Ronald Benner Dec 1992

Denitrification And Oxygen Consumption In Sediments Of Two South Texas Estuaries, Won Bae Yoon, Ronald Benner

Faculty Publications

Spatial and temporal variations in rates of denitrification and oxygen consumption were measured in sediments of the Nueces and Guadalupe Estuaries in southern Texas, USA. Denitrification rates varied from 4.0 to 71.1 µmol N2 m-2 h-1 in the Nueces Estuary and from 4.6 to 34.7 µmol N2 m-2 h-1 in the Guadalupe Estuary. Denitrification accounted for 29 to 80% of total benthic N flux in the study areas. Oxygen consumption rates ranged from 176 to 818 µmol O2 m-2 h-1 in Nueces Estuary and from 208 to 550 µmol O2 …

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Bacterial Numbers And Activity, Microalgal Biomass And Productivity, And Meiofaunal Distribution In Sediments Naturally Contaminated With Biogenic Bromophenols, Charles C. Steward, James L. Pinckney, Yvette Piceno, Charles R. Lovell Dec 1992

Bacterial Numbers And Activity, Microalgal Biomass And Productivity, And Meiofaunal Distribution In Sediments Naturally Contaminated With Biogenic Bromophenols, Charles C. Steward, James L. Pinckney, Yvette Piceno, Charles R. Lovell

Faculty Publications

Sediment cores were collected inside and outside of a bed of a bromophenol-producing marine polychaete, Notomastus lobatus, and examined for impact of the bromophenols on sediment microflora and meiofauna around N. lobatus burrows. No significant differences were found between microbial parameters measured inside and outside of the N. lobatus bed. Integrated 6 cm cores taken adjacent to N. lobatus burrows contained 1.2 x 109 bacteria ml-1. Cell numbers were similar at control sites within the bed, but away from burrows, and not significantly different from cell numbers (1.0 X 109 cells ml-1) at a …

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Inhomogeneous Boundary Effects In Semiconductor Quantum Wires, G. Y. Hu, R. F. O'Connell Dec 1992

Inhomogeneous Boundary Effects In Semiconductor Quantum Wires, G. Y. Hu, R. F. O'Connell

Faculty Publications

Boundary effects play an essential role in determining the physical properties of semiconductor quantum wires. Additional features come into play when one considers inhomogeneous boundaries, i.e. wires whose widths are functions of distance along the length of the wire. The authors show that, in the adiabatic approximation (which assumes that the boundary potential fluctuation effects, or equivalently, the variations in the wire width, occur on a scale much larger than the inverse of Fermi wavelength), the boundary problem for a quantum wire is equivalent to a one-dimensional Schrodinger equation along the wire with: (i) an effective potential provided by the …

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Structural Evidence For Nonplanar Keto- And Planar Enol-Forms Of Oxophlorins, Mathias O. Senge, Kevin M. Smith Dec 1992

Structural Evidence For Nonplanar Keto- And Planar Enol-Forms Of Oxophlorins, Mathias O. Senge, Kevin M. Smith

Faculty Publications

The first structural investigation of a zinc(II) and a free-base oxophlorin reveals considerable conformational differences between the keto- (1) and enol-form (2) of oxophlorins.

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An Inservice Model To Impact Life Science Classroom Practice: Part One, David P. Butts, Wyatt Anderson, Mary Atwater, Thomas Koballa, Patricia Simmons, Rosalina Hairston Dec 1992

An Inservice Model To Impact Life Science Classroom Practice: Part One, David P. Butts, Wyatt Anderson, Mary Atwater, Thomas Koballa, Patricia Simmons, Rosalina Hairston

Faculty Publications

A model inservice program built on a theoretical foundation for changing behavior incorporates both teachers' knowledge, their attitudes as well as what they do. What teachers do in the classroom depends on both what they know and how they feel about what they know, Changing what teachers know and do is accomplished in a three phase sequence, awareness, arousal and action. In the awareness phase, teachers are confronted with their knowledge needs. In the arousal phase, teacher generate interest in using what they know. Action is reflected in what teachers do and is reinforced when they have time to reflect …

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Diffraction Properties Of Stratified Volume Holographic Optical Elements, Gregory P. Nordin, R. V. Johnson, A. R. Tanguay Dec 1992

Diffraction Properties Of Stratified Volume Holographic Optical Elements, Gregory P. Nordin, R. V. Johnson, A. R. Tanguay

Faculty Publications

We present a unified treatment of the diffraction properties of stratified volume holographic optical elements (SVHOE's). We show that the relative phasing of the diffraction orders as they propagate from layer to layer gives rise to a unique notched diffraction response of the +1 order (for the case of Bragg incidence) as a function of the normalized buffer-layer thickness, the grating spatial frequency, and the readout wavelength. For certain combinations of these parameters Bragg diffraction behavior characteristic of volume holographic optical elements (VHOE's) is observed, whereas for other combinations pure Raman-Nath behavior periodically recurs. By using these same relative-phasing arguments, …

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The Making Of Social Policy In Britain 1830-1990, L. Margaret Barnett Dec 1992

The Making Of Social Policy In Britain 1830-1990, L. Margaret Barnett

Faculty Publications

No abstract provided.

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Photopolymer-Based Stratified Volume Holographic Optical Elements, Gregory P. Nordin, A. R. Tanguay Dec 1992

Photopolymer-Based Stratified Volume Holographic Optical Elements, Gregory P. Nordin, A. R. Tanguay

Faculty Publications

We report the implementation of stratified volume holographic optical elements (SVHOE's) using DuPont's Omnidex holographic photopolymer material and an in situ exposure technique for simultaneous multilayer grating recording. Experimental measurement of the +1-order angular sensitivity of a seven-layer SVHOE structure shows remarkable agreement with both theory and numerical simulation for incidence angles near the Bragg angle. For SVHOE's having modulation layers that individually operate in the Bragg or transition diffraction regimes, the envelope of the SVHOE angular sensitivity is experimentally shown to approximate closely that of a single modulation layer.

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Conventionalism And Contractarianism, Noel B. Reynolds Nov 1992

Conventionalism And Contractarianism, Noel B. Reynolds

Faculty Publications

In this paper Noel B. Reynolds’s theory of law as convention is compared to the public choice contractarian theory of James M. Buchanan. While there are numerous similarities, major differences emerge. Only conventionalism can produce legal and political authority and norms to guide the use of that authority in maintaining the rule of law. The concept of constructive unanimity is introduced to overcome the ultimate failure of contractarianism to legitimate the authority of law.

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Tutte Polynomials Computable In Polynomial Time, J. G. Oxley, D. J.A. Welsh Nov 1992

Tutte Polynomials Computable In Polynomial Time, J. G. Oxley, D. J.A. Welsh

Faculty Publications

We show that for any accessible class of matroids of bounded width, the Tutte polynomial is computable in polynomial time. © 1992.

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S Corporation Current Developments, Annette M. Nellen, S. S. Karlinsky Nov 1992

S Corporation Current Developments, Annette M. Nellen, S. S. Karlinsky

Faculty Publications

No abstract provided.

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Intermediate Mass Fragment Emission As A Probe Of Nuclear Dynamics, D. R. Bowman, C. M. Mader, Graham F. Peaslee, W. Bauer, N. Carlin, R. T. De Souza, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, W. G. Lynch, L. Phair, M. B. Tsang, C. Williams, N. Colonna, K. Hanold, M. A. Mcmahan, G. J. Wozniak, L. G. Moretto, W. A. Friedman Nov 1992

Intermediate Mass Fragment Emission As A Probe Of Nuclear Dynamics, D. R. Bowman, C. M. Mader, Graham F. Peaslee, W. Bauer, N. Carlin, R. T. De Souza, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, W. G. Lynch, L. Phair, M. B. Tsang, C. Williams, N. Colonna, K. Hanold, M. A. Mcmahan, G. J. Wozniak, L. G. Moretto, W. A. Friedman

Faculty Publications

Element distributions and fragment multiplicity distributions have been measured for E/A=50 MeV Xe129+12C, Al27, V51, Cunat, Y89, and Au197 reactions using a low threshold 4π detector. Both distributions show a strong correlation with the detected charged particle multiplicity and a large degree of target independence. The measured distributions are compared with hybrid model calculations which incorporate important dynamical aspects in both the preequilibrium and statistical emission phases. Results of these calculations are in reasonable agreement with the data. However, uncertainties with regard to the compressibility of nuclear matter remain due to uncertainties in the coupling of the two models.

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Doping Out The Capitalization Rules After Indopco, John W. Lee Nov 1992

Doping Out The Capitalization Rules After Indopco, John W. Lee

Faculty Publications

In this article, Lee provides guidance for Treasury and the IRS (in their promised clarification of application of INDOPCO). He delineates how to avoid what he perceives as the past pitfalls of capitalization of recurring, insubstantial, or relatively short-lived expenditures with Ito, or inadequate, amortization. The article also sets forth models for (a) amortizing as. a freestanding deferred charge long-lived substantial self-created intangibles such as business expansion costs, including employee training costs, and (b) expensing, or perhaps better, amortizing currently less substantial or regularly recurring, steady state self-created intangibles (such as repairs and advertising, respectively).

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Correlates To Performance On Field Tests Of Muscular Strength, Jeffrey A. Woods, Russell R. Pate, Maria L. Burgess Nov 1992

Correlates To Performance On Field Tests Of Muscular Strength, Jeffrey A. Woods, Russell R. Pate, Maria L. Burgess

Faculty Publications

Field tests of upper body muscular strength and endurance (UBMSE) are often administered to children, but little is known about the determinants of performance on these tests. Therefore the purpose of this investigation was to examine potential determinants of performance on several common field tests of UBMSE including pull-ups, flexed-arm hang, push-ups, and two types of modified pull-ups. Subjects were 56 girls, and 38 boys, ages 9 to 11 years. Potential determinants assessed were age, height, weight, gender, % fat, physical activity, and laboratory measures of muscular strength and endurance. Multiple regression analysis revealed that the laboratory measures of UBMSE …

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Linear Theory Of Non-Neutral Plasma Equilibrium In A Tilted Magnetic Field, Ross L. Spencer, Grant W. Hart Nov 1992

Linear Theory Of Non-Neutral Plasma Equilibrium In A Tilted Magnetic Field, Ross L. Spencer, Grant W. Hart

Faculty Publications

A linear perturbation expansion has been found that allows the rapid and accurate calculation of the response of a non-neutral plasma to a tilted magnetic field. The results of the calculation have been found to agree with previous three-dimensional equilibrium calculations, and also to agree with Keinigs' [Phys. Fluids 24, 860 (1981)] calculation of zero-frequency resonances caused by magnetic field errors. This expansion also allows the perturbed velocity to be calculated. It is speculated that this perturbed flow may be related to the enhanced radial transport in a non-neutral plasma with a tilted magnetic field.

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When Blood Won't Clot, Debra Ann Mills Nov 1992

When Blood Won't Clot, Debra Ann Mills

Faculty Publications

While the history books refer to hemophilia as the disease of kings because it was once common among European royalty, the disorder now makes headlines for a completely different reason. It is estimated that at least 70% of the hemophiliacs whoo received blood products between 1978 and 1985 have been infected with HIV.

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Labeling Graphs With A Condition At Distance 2, Jerrold R. Griggs, Roger K. Yeh Nov 1992

Labeling Graphs With A Condition At Distance 2, Jerrold R. Griggs, Roger K. Yeh

Faculty Publications

No abstract provided.

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Unobserved Ability, Efficiency Wages, And Interindustry Wage Differentials, Mckinley L. Blackburn, David Neumark Nov 1992

Unobserved Ability, Efficiency Wages, And Interindustry Wage Differentials, Mckinley L. Blackburn, David Neumark

Faculty Publications

One competitive-market explanation of interindustry wage differentials that is not challenged by the persistence of these differentials is that they are due to differences across workers in unobserved ability or quality. In contrast, this paper explores the unobserved ability hypothesis by using test scores as error-ridden indicators of ability, and family background variables as instruments.This approach avoids two potential problems with using first-difference methods to remove omitted-ability bias from wage equation estimates of industry effects the exacerbation of measurement error from misclassification of industry, and selectivity with respect to industry changes. However, this approach may introduce other problems, for two …

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Use Of Raman Spectroscopy In Characterizing Soft X-Ray Multilayers: Tools In Understanding Structure And Interfaces, Ming Cai, Qi Wang, David D. Allred, Larry V. Knight, Dorian M. Hatch, A. Reyes-Mena, Guizhong Zhang Oct 1992

Use Of Raman Spectroscopy In Characterizing Soft X-Ray Multilayers: Tools In Understanding Structure And Interfaces, Ming Cai, Qi Wang, David D. Allred, Larry V. Knight, Dorian M. Hatch, A. Reyes-Mena, Guizhong Zhang

Faculty Publications

Our group is studying the structure and interfaces of soft x-ray multilayers by various techniques including x-ray diffraction and Raman spectroscopy. Raman spectroscopy is particularly useful since it is sensitive to the identity of individual bonds and thus can potentially characterize the abruptness of interfaces in multilayers. Blocking interfacial mixing is very important in achieving and maintaining high reflectivity. We report our studies of the as-deposited and postannealed structure of Mo/Si and W/C multilayers. The Mo/Si system is probably the most widely studied multilayer currently because of its potential applications for soft x-ray projection lithography for the range of 13 …

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Jones Polynomials For Intersecting Knots As Physical States Of Quantum Gravity, Bernd Brügmann, Rodolfo Gambini, Jorge Pullin Oct 1992

Jones Polynomials For Intersecting Knots As Physical States Of Quantum Gravity, Bernd Brügmann, Rodolfo Gambini, Jorge Pullin

Faculty Publications

We find a consistent formulation of the constraints of quantum gravity with a cosmological constant in terms of the Ashtekar new variables in the connection representation, including the existence of a state that is a solution to all the constraints. This state is related to the Chern-Simons form constructed from the Ashtekar connection and has an associated metric in space-time that is everywhere nondegenerate. We then transform this state to the loop representation and find solutions to all the constraint equations for intersecting loops. These states are given by suitable generalizations of the Jones knot polynomial for the case of …

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Impact Parameter Filters For 36ar + 197au Collisions At E/A = 50, 80 And 110 Mev, L. Phair, D. R. Bowman, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, W. G. Lynch, Graham F. Peaslee, R. T. De Souza, M. B. Tsang, F. Zhu Oct 1992

Impact Parameter Filters For 36ar + 197au Collisions At E/A = 50, 80 And 110 Mev, L. Phair, D. R. Bowman, C. K. Gelbke, W. G. Gong, Y. D. Kim, M. A. Lisa, W. G. Lynch, Graham F. Peaslee, R. T. De Souza, M. B. Tsang, F. Zhu

Faculty Publications

Collisions between 36Ar projectiles and 197Au target nuclei at have been studied with the MSU Miniball, a 4π phoswich array with a low detection threshold. Various impact-parameter filters, based upon total charged-particle multiplicity, transverse energy, midrapidity charge and multiplicity of emitted hydrogen nuclei, are compared and cross-correlated. The relative selectivity of each prescription for small impact-parameter collisions is evaluated by assessing the suppression of fast-particle emission at forward angles.

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Dna Diversity Among Clinical Isolates Of Helicobacter Pylori Detected By Pcr-Based Rapd Fingerprinting, Natalia Akopyanz, Nickolai O. Bukanov, T. Ulf Westblom, Stephen Kresovich, Douglas E. Berg Oct 1992

Dna Diversity Among Clinical Isolates Of Helicobacter Pylori Detected By Pcr-Based Rapd Fingerprinting, Natalia Akopyanz, Nickolai O. Bukanov, T. Ulf Westblom, Stephen Kresovich, Douglas E. Berg

Faculty Publications

The RAPD (or AP-PCR) DNA fingerprinting method was used to distinguish among clinical isolates of Helicobacter pylori, a bacterium whose long term carriage is associated with gastritis, peptic ulcers and gastric carcinomas. This method uses arbitrarily chosen oligonucleotides to prime DNA sythesis from genomic sites to which they are fortuitously matched, or almost matched. Most 10-nt primers with > 60% G + C yielded strain-specific arrays of up to 15 prominent fragments, as did most longer ( > 17-nt) primers, whereas most 10-nt primers with 50% G +C did not. Each of 64 independent H.pylori isolates, 60 of which were from …

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Enhanced Bacterioplankton Production And Respiration At Intermediate Salinities In The Mississippi River Plume, Gerardo Chin-Leo, Ronald Benner Oct 1992

Enhanced Bacterioplankton Production And Respiration At Intermediate Salinities In The Mississippi River Plume, Gerardo Chin-Leo, Ronald Benner

Faculty Publications

Bacterial abundance and production (thymidine and leucine incorporation) were measured along a salinity gradient from the Mississippi River (0 %0) to the open waters of the Gulf of Mexico (36 %0) during July-August 1990 and February 1991. Bacterial production in surface waters was maximal at intermediate salinities (15 to 30 %0). Nutrient enrichment experiments suggested that bacterial growth near the outflow of the river was C limited whereas bacteria in plume waters of intermediate salinities were P and N limited. Rates of plankton community oxygen demand measured during winter were also maximal at intermediate …

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Free Speech In Pauline Political Theology, David E. Fredrickson Oct 1992

Free Speech In Pauline Political Theology, David E. Fredrickson

Faculty Publications

Although it is generally recognized today that Paul’s faith was not a religion of subjectivity, some may nevertheless object to the notion that the apostle’s theology has a political dimension. Surely, it may be said, the sectarian communities which Paul nurtured with the stark contrasts of “outsiders” and “insiders” did not think that their task was to influence public policy in the cities of the Roman empire. While it is of course preposterous to think that the early Christians had Caesar’s ear, influencing public policy is only one way of engaging in politics.

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Equitable Estoppel Against The Government - The Missouri Experience: Time To Rethink The Concept, Kenneth D. Dean Oct 1992

Equitable Estoppel Against The Government - The Missouri Experience: Time To Rethink The Concept, Kenneth D. Dean

Faculty Publications

The purpose of this article is to examine the Missouri cases to determine if there are patterns which provide guidance in understanding what constitutes “exceptional” circumstances or “manifest injustice,” to determine if there is a coherent theory underlying the application of the *68 doctrine, and, finally, to propose modifications to the traditional approach.

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Democracy In Cape Verde, Richard A. Lobban Oct 1992

Democracy In Cape Verde, Richard A. Lobban

Faculty Publications

The news from Africa usually carries headlines about natural disasters, coups, civil wars, human tights abuses and famine. Despite these tragic cases there is also a bright side the upsurge of a new movement of democratization.

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Ethnic Identity And Constitutional Design For Africa, Alemante G. Selassie Oct 1992

Ethnic Identity And Constitutional Design For Africa, Alemante G. Selassie

Faculty Publications

No abstract provided.

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Linkages Among Preschoolers' Playground Behavior, Outcome Expectations, And Parental Disciplinary Strategies, Craig H. Hart, Michele Dewolf, Diane C. Burts Oct 1992

Linkages Among Preschoolers' Playground Behavior, Outcome Expectations, And Parental Disciplinary Strategies, Craig H. Hart, Michele Dewolf, Diane C. Burts

Faculty Publications

To explore relationships among parent's self-reported disciplinary strategies, preschoolers' outcome expectations, and playground behavior. 136 mothers of preschool age children (age range 39-71 months) participated in home disciplinary style interviews. Measures of preschoolers' outcome expectations and observations of children's' prosocial, antisocial/disruptive, and nonsocial/withdrawn playground behavior were also obtained. results indicated that power-assertive mothers had preschoolers who engaged in more antisocial/disruptive behavior and who expected successful instruments outcomes for hostile methods of resolving peer conflict. Preschoolers with such outcome expectations also participated in more antisocial playground behavior.

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A Symbolic Balanced Budget Amendment, Neal Devins Oct 1992

A Symbolic Balanced Budget Amendment, Neal Devins

Faculty Publications

No abstract provided.

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