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Physical Sciences and Mathematics Commons

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Selected Works

1991

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Articles 1 - 30 of 39

Full-Text Articles in Physical Sciences and Mathematics

How To Pick Out The Integers In The Rationals: An Application Of Number Theory To Logic, Daniel Flath, Stan Wagon Feb 2008

How To Pick Out The Integers In The Rationals: An Application Of Number Theory To Logic, Daniel Flath, Stan Wagon

Stan Wagon, Retired

No abstract provided.


Structural Characterization Of Mixed Alkali Metal Bis(Trimethylsilyl)Amide Bases., Paul Williard, Michael Nichols Dec 1991

Structural Characterization Of Mixed Alkali Metal Bis(Trimethylsilyl)Amide Bases., Paul Williard, Michael Nichols

Michael A Nichols

No abstract provided.


Reconstruction And Future Trends Of The Aids Epidemic In The United States, Ron Brookmeyer Nov 1991

Reconstruction And Future Trends Of The Aids Epidemic In The United States, Ron Brookmeyer

Ron Brookmeyer

There has been considerable uncertainty in estimates of past and current human immunodeficiency virus (HIV) infection rates in the United States. Statistical estimates of historical infection rates can be obtained from acquired immunodeficiency syndrome (AIDS) incidence data and the incubation period. However, this approach is subject to a number of sources of uncertainty and two other approaches, epidemic models of HIV transmission and surveys of HIV prevalence, are used to corroborate and refine the statistical estimates. Analyses suggest the HIV infection rate in the United States grew rapidly in the early 1980s, peaked in the mid-1980s, and subsequently declined markedly. …


Linear Algebra By Analogy, Scott H. Hochwald Nov 1991

Linear Algebra By Analogy, Scott H. Hochwald

Scott H. Hochwald

No abstract provided.


Electrochemical And Spectroscopic Investigations Of The Properties Of Electrified Interfaces, Mark Anderson Nov 1991

Electrochemical And Spectroscopic Investigations Of The Properties Of Electrified Interfaces, Mark Anderson

Mark R. Anderson

No abstract is available at this time.


The Influence Of Cation Size Upon The Infrared Spectrum Of Carbon Monoxide Adsorbed On Platinum Electrodes, Mark Anderson, Jimin Huang Nov 1991

The Influence Of Cation Size Upon The Infrared Spectrum Of Carbon Monoxide Adsorbed On Platinum Electrodes, Mark Anderson, Jimin Huang

Mark R. Anderson

The infrared spectrum of carbon monoxide adsorbed on polycrystalline platinum electrodes in the presence of acetonitrile solutions is examined. Acetonitrile solutions provide a wide double layer region (approximately 4 V) in which to investigate the observed potential dependence of the infrared peak position. The wider window allows for better comparisons of experimental data with theoretical predictions than those which are available from measurements conducted in aqueous solutions. It is found that (i) near-monolayer surface coverage can be obtained from solutions saturated with CO, (ii) the coverage stays constant over roughly the entire double layer region, (iii) the CO adsorbs to …


Spectroelectrochemical Analysis Of Spontaneously Adsorbed Monolayers, Marilyn O'Grady, Mark Anderson Nov 1991

Spectroelectrochemical Analysis Of Spontaneously Adsorbed Monolayers, Marilyn O'Grady, Mark Anderson

Mark R. Anderson

No abstract is currently available.


How To Pick Out The Integers In The Rationals - An Application Of Number-Theory To Logic, D. Flath, Stan Wagon Oct 1991

How To Pick Out The Integers In The Rationals - An Application Of Number-Theory To Logic, D. Flath, Stan Wagon

Stan Wagon, Retired

No abstract provided.


A Collaborative Summer Research Program For Community College Students, Chris Craney, Franklin Dehaan Oct 1991

A Collaborative Summer Research Program For Community College Students, Chris Craney, Franklin Dehaan

Chris L. Craney

While the benefits of undergraduate research are well established, little attention has been paid toward involving community college students in such research. This paper describes a five-year-experience with a summer research program that includes Los Angeles area community college students working side-by-side with Occidental College students and faculty.


Use Of A Commercially Available Flight Simulator During Aircrew Performance Testing, S. A. Shappell, B. J. Bartosh Oct 1991

Use Of A Commercially Available Flight Simulator During Aircrew Performance Testing, S. A. Shappell, B. J. Bartosh

Scott Shappell

Investigations of aircrew sustained operations (SUSOPS) have been criticized for employing tasks with no apparent
external validity. Because measures obtained directly from aviators flying high-performance aircraft are difficult to
obtain, a laboratory compromise is needed. High-fidelity flight simulators used for aircrew training offer the most
realistic simulation, but their availability is limited. Personal computer-based flight simulators may provide adequate
simulation in, the laboratory at a rea.sonable cost. This report describes a representative research protocol using a
commercially available flight simulator during a simulated aircrew SUSOP.


The Relevance Of Fouling Models To Crossflow Microfiltration, Caroline Lubert, R. Wakeman, E. Tarleton Sep 1991

The Relevance Of Fouling Models To Crossflow Microfiltration, Caroline Lubert, R. Wakeman, E. Tarleton

Caroline P Lubert

No abstract provided.


Madagascar: Island Of Ghosts, Nat Quansah Sep 1991

Madagascar: Island Of Ghosts, Nat Quansah

Nat Quansah

No abstract provided.


Spectroelectrochemical Analysis Of Metal Surfaces Modified With Thin Organic Films, Marilyn O'Grady, Mark Anderson Sep 1991

Spectroelectrochemical Analysis Of Metal Surfaces Modified With Thin Organic Films, Marilyn O'Grady, Mark Anderson

Mark R. Anderson

No abstract is currently available.


Determination Of The Vertical Ionization Potentials Of Small Sodium Clusters Using Path Integral Monte Carlo Calculations, Sean E. Hays, Randall W. Hall Sep 1991

Determination Of The Vertical Ionization Potentials Of Small Sodium Clusters Using Path Integral Monte Carlo Calculations, Sean E. Hays, Randall W. Hall

Randall W. Hall

Feynman's path integral formulation of quantum mechanics, supplemented by an approximate pseudopotential to account for exchange, is used to determine the vertical ionization potentials of Na1-Na4. Results are in good agreement with both the trends and the quantitative results of earlier work, We observe that the amount of discretion necessary to obtain converged energies is greater than that needed to obtain qualitatively correct information regarding the nature of the correlated wave function.


The Use Of Kindergarten Screening Scores To Identify The Need For Reading Intervention: A Logit Regression Study, Jayn Crail, John Fraas Sep 1991

The Use Of Kindergarten Screening Scores To Identify The Need For Reading Intervention: A Logit Regression Study, Jayn Crail, John Fraas

John W. Fraas

No abstract provided.


Chelation Of 2-Substituted 1-Lithoxides: Structural And Energetic Factors Of Relevance To Synthetic Organic Chemistry., Michael Nichols, Andrew Mcphail, Edward Arnett Jul 1991

Chelation Of 2-Substituted 1-Lithoxides: Structural And Energetic Factors Of Relevance To Synthetic Organic Chemistry., Michael Nichols, Andrew Mcphail, Edward Arnett

Michael A Nichols

No abstract provided.


Handling Constraints In Genetic Algorithms, Cezary Janikow, Zbigniew Michalewicz Jul 1991

Handling Constraints In Genetic Algorithms, Cezary Janikow, Zbigniew Michalewicz

Cezary Janikow

The major difficulty in applicability of genetic algorithms to various optimization problems is the lack of general methodology for handling constraints. This paper discusses a new such methodology and presents results from the experimental system GENOCOP (for GEnetic algorithm for Numerical Optimization for COnstrainted Problems). The system not only handles any objective function with any set of linear constraints, but also effectively reduces the search space. The results indicate that this approach is superior to traditional methods when applied to the nonlinear transportation problem.


Characterization Of Adsorption By Electrochemical And Spectroscopic Methods, Mark Anderson Jul 1991

Characterization Of Adsorption By Electrochemical And Spectroscopic Methods, Mark Anderson

Mark R. Anderson

No abstract is available at this time.


Interpretation Issues In Force Microscopy, Nancy Burnham, Richard Colton, Hubert Pollock Jun 1991

Interpretation Issues In Force Microscopy, Nancy Burnham, Richard Colton, Hubert Pollock

Nancy A. Burnham

In this paper, we will discuss force microscopy (FM) and its potential for determining mechanical properties of thin films. We will introduce the basic principles of FM, and demonstrate how FM can be used to determine materials properties as well as image surface topography, both with nanonewton or sub‐nanonewton force resolution and sub‐nanometer position resolution. As FM is still a new field, not all of the questions concerning interpretation have been fully answered. We will elucidate four current issues that must be resolved before the full potential of FM can be realized. They are: (1) the role of water vapor …


Setting Time Effects On Bentonite Water-Well Annulus Seals, Fred L. Ogden Jun 1991

Setting Time Effects On Bentonite Water-Well Annulus Seals, Fred L. Ogden

Fred L. Ogden

Shear strength tests are conducted in a model of a water well on four, commercially available, granular bentonite well sealing products. The time dependency of annulus seal shear strength and resistance to piping is examined. Dry bentonite samples are placed through water in the annular space between the casing and borehole and allowed to set for a specified time. Pressure is applied at a constant rate to one end of the clay seal until shear or piping failure occurs. Pressure and seal displacement data are recorded on a digital data acquisition system. Annulus seal strength and resistance to piping increase …


The Influence Of Cation Size Upon The Infrared Spectrum Of Carbon Monoxide Adsorbed On Platinum Electrodes, Mark Anderson, Jimin Huang Jun 1991

The Influence Of Cation Size Upon The Infrared Spectrum Of Carbon Monoxide Adsorbed On Platinum Electrodes, Mark Anderson, Jimin Huang

Mark R. Anderson

No abstract is currently available.


The Influence Of Cation Size Upon The Infrared Spectrum Of Carbon Monoxide Adsorbed On Platinum Electrodes, Mark Anderson, Jimin Huang May 1991

The Influence Of Cation Size Upon The Infrared Spectrum Of Carbon Monoxide Adsorbed On Platinum Electrodes, Mark Anderson, Jimin Huang

Mark R. Anderson

No abstract is currently available.


Observability Of The Anapole Moment And Neutrino Charge Radius, Mj Musolf, Br Holstein Apr 1991

Observability Of The Anapole Moment And Neutrino Charge Radius, Mj Musolf, Br Holstein

Barry R Holstein

The properties of the neutrino charge radius (NCR) and anapole moments (AM's) of elementary fermions, nucleons, and nuclei are discussed. The dependence of these off-shell electromagnetic couplings on the weak gauge parameter is explicitly demonstrated by a calculation performed in the Rξ gauge. The gauge dependence of the AM's and NCR implies that they cannot be observed in isolation from other second-order, electroweak effects. It is shown, however, that the AM's of various hadronic systems having an SU(2)L quantum number TL3=0 can be considered ``observables'' in certain formal, though unphysical, limits. It is argued that, apart from these special limits, …


Thermochronology And Thermobarometry In Lithotectonic Zones In Eastern New England, Andrea Koziol, Robert Wintsch Apr 1991

Thermochronology And Thermobarometry In Lithotectonic Zones In Eastern New England, Andrea Koziol, Robert Wintsch

Andrea M. Koziol

Eastern New England is now recognized to consist of a number of exotic terranes joined to ancestral North America along large faults. However, the timing of the accretion of these terranes is in a state of flux. This project will gather thermometric and barometric data from both sides of these terrane bounding faults and together with existing age determinations will assess the possibility of major Alleghenian motion, not previously recognized. Results have the potential to provide a major re-interpretation of the timing of terrane accretion in New England.


Sniftirs Study Of The Behavior Of The Spectrum Of Carbon Monoxide Adsorbed On A Platinum Electrode In Alcoholic Solvents, Andrea Russell, Daniel Blackwood, Mark Anderson, Stanley Pons Apr 1991

Sniftirs Study Of The Behavior Of The Spectrum Of Carbon Monoxide Adsorbed On A Platinum Electrode In Alcoholic Solvents, Andrea Russell, Daniel Blackwood, Mark Anderson, Stanley Pons

Mark R. Anderson

The vibrational spectrum of carbon monoxide as a function of coverage in various alcoholic solvents was investigated using the SNIFTIRS technique. At low coverage the potential dependence of the band position was found to be linearly dependent on the inverse of the bulk dielectric constant of the solvent. An electrostatic model was developed to represent the interaction between adjacent adsorbate molecules. This model provides evidence in support of an island formation mechanism.


Experimental Studies Of Fe-Mg Carbonates As Indicators Of Martian Near-Surface Conditions, Andrea Koziol Jan 1991

Experimental Studies Of Fe-Mg Carbonates As Indicators Of Martian Near-Surface Conditions, Andrea Koziol

Andrea M. Koziol

This research project received funding from the National Aeronautics and Space Administration from February 1999 to February 2000.


The (First) Three B’S Of The Skyrme Model, Alec Schramm Dec 1990

The (First) Three B’S Of The Skyrme Model, Alec Schramm

Alec J Schramm

No abstract provided.


Higgs Boson Production In Peripheral Heavy-Ion Collisions: Coherent Double-Pomeron Exchange, Alec Schramm, Berndt Muller Dec 1990

Higgs Boson Production In Peripheral Heavy-Ion Collisions: Coherent Double-Pomeron Exchange, Alec Schramm, Berndt Muller

Alec J Schramm

Higgs boson production by coherent double-pomeron exchange in peripheral nuclear collisions at energies of several TeV per nucleon is calculated. It is shown that a trigger on quasi-elastic nuclear collisions strongly suppresses the cross section. The analogous two-photon process is predicted to dominate for collisions of heavy nuclei.


Digital-Image-Based Study Of Circular Holes In An Elastic Matrix, Anthony Day, K. Snyder, E. Garboczi, M. Thorpe Dec 1990

Digital-Image-Based Study Of Circular Holes In An Elastic Matrix, Anthony Day, K. Snyder, E. Garboczi, M. Thorpe

Anthony Roy Day

No abstract provided.


The Development Of An Industrial Waste Regulatory Program, John Dernbach, William Pounds Dec 1990

The Development Of An Industrial Waste Regulatory Program, John Dernbach, William Pounds

John C. Dernbach

No abstract provided.