Digital Commons Network^™

Object Parallel Spatio-Temporal Analysis And Modeling System, David Bruce Rex

Dissertations and Theses

The dissertation will outline an object-oriented model from which a next-generation GIS can be derived. The requirements for a spatial information analysis and modeling system can be broken into three primary functional classes: data management (data classification and access), analysis (modeling, optimization, and simulation) and visualization (display of data). These three functional classes can be considered as the primary colors of the spectrum from which the different shades of spatial analysis are composed. Object classes will be developed which will be designed to manipulate the three primary functions as required by the user and the data.

A Study Of Dynamic Optimization Techniques: Lessons And Directions In Kernel Design, Calton Pu, Jonathan Walpole

Computer Science Faculty Publications and Presentations

The Synthesis kernel [21,22,23,27,28] showed that dynamic code generation, software feedback, and fine-grain modular kernel organization are useful implementation techniques for improving the performance of operating system kernels. In addition, and perhaps more importantly, we discovered that there are strong interactions between the techniques. Hence, a careful and systematic combination of the techniques can be very powerful even though each one by itself may have serious limitations. By identifying these interactions we illustrate the problems of applying each technique in isolation to existing kernels. We also highlight the important common under-pinnings of the Synthesis experience and present our ideas on …

Towards Comprehensive Migration Modeling: A Meta-Analytic Approach, Wamukota Francis Wambalaba

Dissertations and Theses

In view of theoretical proliferations in migration studies, there is a need for a more comprehensive approach to migration modeling. A central problem identified in this study was the multitude of potential variables for migration research and the lack of established procedures for selecting among them. Several studies on migration have attempted to answer cornmon migration questions, but with differing variables and therefore divergent conclusions. There is thus a strong potential for misinterpretation by researchers and policy makers. Partial theories of migration have been developed rather than a unified one. This study offers an objective process through which variables may …

Nuclear Magnetic Resonance Study Of Antigen-Antibody Complexes, Including Sequence Specific Assignments And Structural Analysis Of Neurophysin As An Antigen Model, Elisar Jamil Barbar

Dissertations and Theses

The interaction between molecules is essential in a wide range of biological processes. A detailed knowledge of these interactions is necessary for understanding these processes. Among the systems that involve important interactions is the immune system. NMR spectroscopy has a large number of spectral parameters that were used in this work to study antibody-antigen interactions. These same parameters were also used to begin a structural analysis of a medium-sized protein, neurophysin, that has important interactions with neurohormones, and served here as a model antigen. A set of ligands differing in size and charge was designed and used to probe the …

Ultrashort‐Pulse Propagation In Dye Laser Amplifiers, Shuanghua Jiang, Lee W. Casperson

Electrical and Computer Engineering Faculty Publications and Presentations

A semiclassical model is presented for ultrashort‐pulse dye laser amplifiers. The model permits a discussion of important aspects of short‐pulse amplification such as pulse shape, pulse energy, and gain saturation. Coherence effects are found to be important in characterizing the evolution of amplified pulses in the subpicosecond and femtosecond regimes. The results are compared with those obtained using the corresponding rate equation model.

Archaeological Considerations On Social Dynamics And Spatial Pattern Development Of Traditional Settlements, E. Kofi Agorsah

Black Studies Faculty Publications and Presentations

One fascinating aspect of archaeological analysis is the explanation of the frequency with which material manifestations of man's behaviour are bonded together. The complexity of the interconnections and associations makes it even more challenging and exciting. Areal variations of the relationships between cultural phenomena are so numerous that archaeologists have, over the centuries, looked for regularities or patterning among distributions of these material manifestations. It is not the patterns that are recognised nor the fact that their distribution varies from place to place that is of greatest interest. Rather it is the past behaviour of the society concerned that is …

The Vocational Interests Of Prisoners: A Preliminary Validation Study Of The Lustig Color Vector Test, Hanoch Livneh, Robert E. Pullo, Paul Lustig

Counselor Education Faculty Publications and Presentations

The purpose of this study was to provide empirical evidence for the validity of the Lustig Color Vector Test (LCVT) as a vocational interest measure. The LCVT, a nonverbal instrument, is a schematic attempt to represent the Vector Theory of Behavior which describes human behavior in terms of motion and the laws of physics. A sample of 92 participants was chosen to represent the literate male population of incarcerated offenders in the Wisconsin state prison system.-Participants were administered the LCVT as well as Holland's Vocational Preference Inventory (VPI) and a demographic questionnaire. The results offered tentative support to the notion …

Hydrodynamic Theory Of Multicomponent Diffusion And Thermal Diffusion In Multitemperature Gas Mixtures, John D. Ramshaw

Physics Faculty Publications and Presentations

A phenomenological theory is developed for multicomponent diffusion, including thermal diffusion, in gas mixtures in which the components may have different temperatures. The theory is based on the hydrodynamic approach of Maxwell and Stefan, as extended and elaborated by Furry [1] and Williams [2]. The present development further extends these earlier treatments to multiple temperatures and multicomponent thermal diffusion. The resulting diffusion fluxes obey generalized Stefan-Maxwell relations which include the effects of ordinary, forced, pressure, and thermal diffusion. When thermal diffusion is neglected, these relations have the same form as the usual single-temperature ones, except that mole fractions are replaced …

Portland State Magazine, Portland State University. Office Of University Communications

Portland State Magazine

PSU’s alumni magazine, published 2-3 times a year. In this issue: The Pacific Northwest is ripe for a major quake in the not-so-distant future; layoffs and job cutbacks will persist in the new administration, but this may not be the best way for companies to go; does the Metropolitan Service District represent a loss of local control or a boon for delivery of regional services?; a PSU alumna has helped organize diaries from the Oregon Trail as a volunteer for the Oregon Historical Society; and more.

Annual Faculty Senate Minutes October 1993 - June 1994, Portland State University Faculty Senate

Annual Compilations of the Faculty Senate Minutes (Minutes Only)

Minutes of the Faculty Senate for October 1993 to June 1994.

The Evolution Of Federal Transit Policy, Sy Adler

Urban Studies and Planning Faculty Publications and Presentations

Examines how the US federal government came to subsidize a greater share of transit industry costs than most other national governments. Since World War II, downtown activists sought to boost their transit systems in the face of increasingly intense competition from suburban business centers; the transit systems of Los Angeles and San Francisco in particular were shaped by this competition. Downtown activists tried, with varying success, to influence the newly formed regional transit agencies and the Federal Department of Transportation, created in 1964. The federal government's role in urban transit has been characterized by a tension between economic rationalization and …

When Will A Genetic Algorithm Outperform Hill-Climbing?, Melanie Mitchell, John H. Holland

Computer Science Faculty Publications and Presentations

In this paper we review some previously published experimental results in which a simple hillclimbing algorithm-Random Mutation Hill-Climbing (RMHC)-significantly outperforms a genetic algorithm on a simple "Royal Road" function. vVe present an analysis of RMHC followed by an analysis of an "idealized" genetic algorithm (IGA) that is in turn significantly faster than RMHC. We isolate the features of the IGA that allow for this speedup, and discuss how these features can be incorporated into a real GA and a fitness landscape, making the GA better approximate the IGA. We use these features to design a modified version of the previously …

Revisiting The Edge Of Chaos: Evolving Cellular Automata To Perform Computations, Melanie Mitchell, Peter T. Hraber, James P. Crutchfield

Computer Science Faculty Publications and Presentations

No abstract provided.

When Mathematicians And Mathematics Teachers Come Together, Ronald B. Narode

Curriculum and Instruction Faculty Publications and Presentations

In accordance with recommendations from educators and educational researchers [Wilcox, et a!, 1991; Schwab, 1976], recent attempts to integrate the communities of professional mathematicians and high school mathematics teachers in the U.S A. have resulted in several summer institutes which bring these groups together for up to four weeks. Through living, working, and studying together, the two normally disparate groups are expected to develop a dialogue for the mutual benefit of the participants and for their students. The present study of one such institute was conducted with the use of interviews of the participants, examination of some of the teachers' …

The Morphology Of Lava Flows In Planetary Environments: Predictions From Analog Experiments, Ross W. Griffiths, Jonathan H. Fink

Geology Faculty Publications and Presentations

The rates of surface cooling and lateral spreading are evaluated for lava flows on the surface of Earth, Venus, Mars, the Moon, and 10. Differences between the flow morphologies expected in these environments are then predicted under the assumption that the results of recent laboratory simulations oflavas using wax extruded beneath cold water (Fink and Griffiths, 1990) can be carried over. These experiments involved the spreading of viscous liquid under gravity in the presence of a solidifying surface crust and revealed a set of four distinct surface morphologies. Transitions from one morphology to the next occurred in a well-defined sequence …

The Effects Of Rapid Heating And Cooling On The Composition, Structure, And Superconducting Properties Of Bi-Sr-Ca-Cu-O Compounds, Qing Duan

Dissertations and Theses

Bulk and thin film samples of Bi₂₋[subscript x]Pb[subscript x]Sr₂Ca₂Cu₃O[subscript y] compounds were prepared by suitable methods. The thin film and bulk samples were exposed to argon gas at temperatures of about 2000 °C and pressures of about 300 atm. in a ballistic compressor (BC) and then cooled at a rate of about 10⁵ °C/sec. The samples before and after this treatment were examined and compared using a transmission electron microscope (TEM), a scanning electron microscope (SEM), an energy dispersive spectrometer (EDS) , and an x-ray diffractometer (XRD). Resistance and magnetic susceptibility measurements were made to determine changes in superconducting temperature …

Solidification And Morphology Of Submarine Lavas: A Dependence On Extrusion Rate, Ross W. Griffiths, Jonathan H. Fink

Geology Faculty Publications and Presentations

The results of recent laboratory experiments with wax extruded beneath relatively cold water may be extrapolated to predict the surface morphology of submarine lavas as a function of the extrusion rate and melt vIscosity. The experiments with solidifying wax indicated that the surface morphology was controlled by a single parameter, the ratio of the time taken for the surface to solidify, and a time scale for lateral flow. For submarine basalts a solution of the cooling problem (which is dominated by conduction in the lava but convective heat transfer in the water) and estimates of lava viscosities place this parameter …

Semiconductor P-N Junction Space Charge Region Capacitance, Mohammad Humayun Habib

Dissertations and Theses

The classical capacitance voltage characteristics based on the depletion approximation, is adequate at reverse bias, but introduces errors at high forward bias. Because of its inherent simplicity and compactness this classical depletion model is well studied and widely used in circuit simulators. In this work, a new model for the semiconductor space charge region (SCR) capacitance, based on physical justification, will be derived. This new model takes three input parameters, C0 , Vbi and m, thus eliminating the fitting parameter FC currently used in SPICE. This new model is applicable for any applied voltage and will be compared with the …

Faculty Senate Monthly Packet December 1992, Portland State University Faculty Senate

Faculty Senate Monthly Packets

The December 1992 Monthly packet includes the December agenda and appendices and the Faculty Senate minutes and attachments from the meeting held November 1992.

Explosion Of A Liquid Film In Contact With A Pulse-Heated Solid Surface Detected By The Probe-Beam Deflection Method, P.T. Leung, Andrew C. Tam, Nhan Do, Leander Klees, Wing P. Leung

Physics Faculty Publications and Presentations

The threshold for explosive vaporization of a liquid layer on an opaque solid surface heated by an ultraviolet excimer pulsed laser is studied by a photoacoustic probe-beam deflection method. The probe beam traverses the liquid in the vicinity of the laser-heated liquid-solid interface. Below the explosion threshold, photoacoustic generation in the solid occurs only through a thermoelastic mechanism, which results mainly in shear waves that do not couple well into the liquid. Above the explosion threshold, photoacoustic pulses in the solid are also produced by explosive recoil, hence producing longitudinal pulses in the solid that couple well into the liquid …

Correction Of Chromatic Aberration With An Electron Mirror, Michael Stewart Mauck

Dissertations and Theses

The theoretical basis for using electron mirrors as correctors of chromatic aberration is presented and an experimental verification of correction of chromatic aberration is demonstrated. A hyperbolic electrostatic electron mirror operating in its converging range and at unity magnification was used as a corrector. A novel separating system with deflections taking place at image planes was developed to implement the mirror without impairing the resolution. Correction was demonstrated in an electron optical probe system. The chromatic aberration was measured by means of the shadows cast by a fine mesh placed near the final image. The experimental method and equipment are …

Dynamic Nmr Study Of Bond Rotational Activation Parameters In Micelles, Dietmar A. Leitner

Dissertations and Theses

The behavior of surfactants in solution has been and still is of scientific, technological, and industrial interest. The micelle forming compounds sodium N-( octyloxycarbonyl)sarcosinate (NaOcSarc), and sodium N-(decyloxycarbonyl)sarcosinate (NaDecSarc) show in aqueous solution two ¹H NMR N-methyl peaks arising from a possible cis- or trans-conformation. The relative population of the N-methyl peaks depends mostly on the concentration of surfactant indicating micelle formation. Upon heating the two peaks start to coalesce and finally appear as one single peak. The temperature range in which this phenomenon occurs is from 25°C to 65°C. The primary interest of this study was to determine …

Compiling Ace For Distributed-Memory Machines, Jun Song

Dissertations and Theses

Distributed-memory machines offer a very high level of performance, flexibility and scalability. But the memory organization of this kind of machine determines that processes on different processors must communicate explicitly by sending and receiving messages. As a result, the programmer faces the enormously difficult task of detailed planning of algorithm-irrelevant, low-level communication issues. This level of programming resembles writing assembly programs for a sequential machine.

ACE is a message-passing language with abstract communication statements. It was defined by Dr. Jingke Li at Portland State University. The communication in ACE is still explicit, but it is abstracted to a higher level. …

Faculty Senate Monthly Packet November 1992, Portland State University Faculty Senate

Faculty Senate Monthly Packets

The November 1992 Monthly packet includes the November agenda and appendices and the Faculty Senate minutes and attachments from the meeting held October 1992.

A Technique For The Evaluation Of Double Excitation Of Atoms By Fast Protons And Antiprotons, Jack C. Straton, James H. Mcguire, Zheng Chen

Physics Faculty Publications and Presentations

A technique for evaluating cross sections for two-electron excitation in collisions of atoms with fast particles of charge ZP is presented. The atomic wave function is approximated by a sum of pair products of one-electron wave functions, with the coefficients chosen by diagonalizing the fully correlated twoelectron Hamiltonian. Thus spatial correlation is included in both the asymptotic and scattering regions by using these configuration-interaction (Cl) wave functions for initial, intermediate, and final states. Use of CI wave function also allows the first-order contributions to be expressed in closed, analytical form. Both the energy-conserving and energy-nonconserving parts of the second-order amplitude …

Binary Mixtures Near Surfaces, Patrick Dunn

Dissertations and Theses

This paper presents an approach to modeling a binary mixture near a surf ace. The approach used is based on statistical mechanics. The Cluster Variation (CV) method is used to solve an Ising-like model with a cluster size of two (neighboring lattice points). The free energy of the system is expressed in terms of the probabilities of occurrences of particular clusters. The CV method is first developed for a homogeneous system which leads to a set of three non-linear partial differential equations. The surface boundary is then introduced and the CV method is developed for this system which leads to …

A Classroom Preferences Questionnaire Based On The Theory Of Multiple Intelligences, Allyn Snider

Dissertations and Theses

A questionnaire based on Gardner's Theory of Multiple Intelligences was developed and administered to forty-five second grade students in three different classrooms. Sections of the fifty-eight item questionnaire dealt with students' preferences for certain classroom activities, methods of learning, and modes of social interaction. Each student's responses were summarized to create an individual profile, indicating preference for linguistic, mathematical, and/ or spatial activity. In addition, students' preferences for receptive and/ or expressive methods of learning, and for working by themselves, with peers, or with adults were profiled.

Flux Trapping In Superconducting Pellets, Andreas Straub

Dissertations and Theses

This research concerns the effects on samples of nominal composition Bi_1.8Pb_0.2Sr₂Ca₂Cu₃O_y which were exposed to hot, dense argon in a ballistic compressor.

The investigations were concentrated on two specimens which were exposed to hot, dense argon at about 1800 K (peak pressure 330 atm) and 1500 K (peak pressure 230 atm), respectively. Sample Bi #1 showed a completely melted surface structure after triple exposure in the ballistic compressor at 1800 K while the surface of sample Bi #7 was just partly melted after double exposure at 1500 K.

Changes …

"Ambition Has Always Been My God": William Winlock Miller And Opportunity In Washington Territory, William L. Lang

History Faculty Publications and Presentations

In October 1875, when he was at the acme of his success as a pioneer Olympia businessman, William Winlock Miller offered some fatherly advice to an elder sister's son who had recently emigrated from Illinois:

If your object in corning hither was to get employment as a clerk it was injudicious-we only want men here who have muscle and are willing to labor. But now that you are here I would make the best of it. ... Avoid saloons and all places of vice. Don't drink, chew, or swear. Start at the foot of the ladder. Practice economy. Every young …

Effective Middle School Teaching: Factors That Promote And Maintain It, Judith Ann Smith

Dissertations and Theses

The past thirty years has seen the middle school as an organization come of age and with it a renewed emphasis on meeting the needs of the early adolescent student. Although many current studies have addressed middle school issues, one of the most significant was the Carnegie Council on Adolescent Development's Turning Points: Preparing Youth for the 21st Century (1989). It claimed that the middle school is the "last best chance" to turn young lives toward a meaningful future and, in order to do so, schools must be staffed with "expert" teachers.

Once one knows what an "expert" teacher is, …