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Nucleation And Heat Transfer In Liquid Nitrogen, Eric Roth

Dissertations and Theses

With the advent of the new" high Tc superconductors as well as the increasing use of cryo-cooled conventional electronics, liquid nitrogen will be one of the preferred cryogens used to cool these materials. Consequently, a more thorough understanding of the heat transfer characteristics of liquid nitrogen is required. In these investigations the transient heating characteristics of liquid nitrogen to states of nucleate and film boiling under different liquid flow conditions are examined. Using a metal hot wire/plate technique, it is verified that there is a premature transition to film boiling in the transient case at power levels as much as …

On Matching Ann Structure To Problem Domain Structure, George G. Lendaris, Martin Zwick, Karl Mathia

Complex Systems Faculty Publications and Presentations

To achieve reduced training time and improved generalization with artificial neural networks (ANN, or NN), it is important to use a reduced complexity NN structure. A "problem" is defined by constraints among the variables describing it. If knowledge about these constraints could be obtained a priori, this could be used to reduce the complexity of the ANN before training it. Systems theory literature contains methods for determining and representing structural aspects of constrained data (these methods are herein called GSM, general systems method). The suggestion here is to use the GSM model of the given data as a pattern for …

Central City Transportation Management Plan, Portland (Or.) Lloyd District Task Force, Shiels & Obletz, Jhk & Associates, Meeting Points

Portland City Archives

No abstract provided.

The Urban West And The Twenty-First Century, Carl Abbott

Urban Studies and Planning Faculty Publications and Presentations

In 1964 Oregon novelist Ken Kesey published Sometimes a Great Notion, the impassioned story of a fiercely (even pathologically) independent family of loggers on the southern Oregon coast. The novel is much admired by Oregonians, who read it as a tribute to the vanishing American pioneer. The urban West appears only by implication in the form of a fumbling labor organizer who longs to return to the civilized cities of California. My argument is that what we see is what we're going to get. That is, the coming decades are likely to see the American West continue to work through …

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 …

Pump And Signal Cross Saturation In Cw Dye Lasers, Lee W. Casperson, A. C. Wilson, W. J. Sandle

Electrical and Computer Engineering Faculty Publications and Presentations

It is well known that the signal output intensity from a dye laser oscillator depends directly on the pump intensity. The opposite effect, the dependence of the transmitted pump intensity on the signal intensity, is studied in detail. The theoretical results are compared with experimental data obtained using an argon‐laser‐pumped rhodamine 6G dye laser.

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.

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 …

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 …

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 …

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.

Viking 1993, Portland State University

The Viking (Yearbooks)

Portland State University 1993 yearbook

Bonneville Power Administration And Conservation, Ernest Bonner

Ernie Bonner Collection

No abstract provided.

Bud Clark Leaving Office, Bud Clark

Ernie Bonner Collection

No abstract provided.

An Implementation Analysis Of The Water Resources Development Act Of 1986, James Joseph Rich

Dissertations and Theses

Implementation research, an area once largely ignored in favor of policy design and impact assessment, now constitutes a significant portion of the policy analysis literature. One of the key issues addressed by the theory building portion of that literature is the necessity of precisely identifying implementation variables, conditions, or actions that measurably contribute to the success or failure of implementation efforts over a broad range of policies and programs, and to then suggest some order of significance. In order to test the validity of a variable set proposed by the literature, a multivariate implementation model was employed as the basis …

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.

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 …

Springwater Corridor Master Plan, Portland (Or.). Bureau Of Parks And Recreation

Portland Regional Planning History

This master plan sets the direction for development of the Springwater Corridor into the premier urban recreation and alternative transportation corridor in the State of Oregon, with an expected annual user count of over 400,000. With its connections to neighborhood, community and regional parks and open spaces, in addition to employment centers and residential neighborhoods, it will pull users from a region-wide area as well as the 150,000 people who live within a two-mile distance along the route of the Corridor.

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.

The Use Of Laboratory Testing To Understand The Behavior Of Collapsible Soil Upon Wetting, Martha H. Denham

Dissertations and Theses

In developing a constitutive model that could predict the settlement due to the collapse, several goals needed to be met. These were to gain an understanding of the collapse phenomenon, knowing the soil properties at the natural water content and how they change after collapse, and develop and test the new model. It was felt that laboratory testing could be of use. The types of test conducted included use of the Oedometer, Pressuremeter, and Triaxial tests. The material that was used for the testing was a "generic" soil manufactured out of diatomite. In all of the tests the soil was …

City Club Report Ballot Measures 5 And 6: Closure Of Trojan Nuclear Power Plant, City Club Of Portland (Portland, Or.)

City Club of Portland

No abstract provided.

A Gaze-Addressing Communication System Using Artificial Neural Networks, Gabriel Baud-Bovy

Dissertations and Theses

Severe motor disabilities can render a person almost completely incapable of communication. Nevertheless, in many cases, the sensory systems are intact and the eye movements are still under good control. In these cases, one can use a device such as the Brain Response Interface (BRI) to command a remote control (e.g. room temperature, bed position), a word-processor, a speech synthesizer, and so on.

The BRI is a gaze-addressing communication system that was developed by Dr. Erik E. Sutter at the Smith-Kettlewell Eye Research Institute, San-Francisco: a menu of communication objects (e.g. letter, word, command) is displayed on a TV screen; …

Meeting Notes 1992-10-08 , Joint Policy Advisory Committee On Transportation

Joint Policy Advisory Committee on Transportation

No abstract provided.

Meeting Notes 1992-09-17 , Joint Policy Advisory Committee On Transportation

Joint Policy Advisory Committee on Transportation

No abstract provided.

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: A PSU professor continues his work on innovative community projects while coping with the effects of a cancerous brain tumor; community and alumni accomplishments remain, despite the closing of the School of Health and Human Performance; Columbia River Correctional Institution is like a small town with a PSU alumnus as its mayor; students photographed the people and places of Portland State during a 24-hour period last spring; and more.

Meeting Notes 1992-08-13 , Joint Policy Advisory Committee On Transportation

Joint Policy Advisory Committee on Transportation

No abstract provided.

Minimization Of Exclusive Sum Of Products Expressions For Multiple-Valued Input Incompletely Specified Functions, Ning Song

Dissertations and Theses

In recent years, there is an increased interest in the design of logic circuits which use EXOR gates. Particular interest is in the minimization of arbitrary Exclusive Sums Of Products (ESOPs). Functions realized by such circuits can have fewer gates, fewer connections, and take up less area in VLSI and especially, FPGA realizations. They are also easily testable. So far, the ESOPs are not as popular as their Sum of Products (SOP) counterparts. One of the main reasons it that the problem of the minimization of ESOP circuits was traditionally an extremely difficult one. Since exact solutions can be practically …