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Optimization And Thermodynamic Performance Measures Of A Class Of Finite Time Thermodynamic Cycles, Joseph D. Walters

Dissertations and Theses

Modifications to the quasistatic Carnot cycle are developed in order to formulate improved theoretical bounds on the thermal efficiency of certain refrigeration cycles that produce finite cooling power. The modified refrigeration cycle is based on the idealized endoreversible finite time cycle. Two of the four cycle branches are reversible adiabats, and the other two are the high and low temperature branches along which finite heat fluxes couple the refrigeration cycle with external heat reservoirs.

This finite time model has been used to obtain the following results: First, the performance of a finite time Carnot refrigeration cycle (FTCRC) is examined. In …

The Overage Student: Candidate For School Failure, Virginia Homeier Anderson

Dissertations and Theses

This study, conducted in a suburban school district, examined academic achievement and demographic considerations for a group of students overage for their respective grades. Records of 127 subjects were examined and data collected with respect to student performance on academic indicators of at risk behavior. Indicators were scores on criterion referenced tests in reading and mathematics as well as school absence figures for all subjects. These data were subjected to ANOVA and Chi Square Tests of significance to ascertain if there were differences between the students who were overage due to in-grade retention and those overage for other reasons. Research …

Job Satisfaction Of Classified Employees In A Public Suburban School District, Jeradean Emma Rehm Masciocchi

Dissertations and Theses

This study examined the sources of job satisfaction and dissatisfaction for classified employees in a large public suburban school district. The population included randomly-selected bus drivers, custodians, school and non-school secretarial employees, instructional assistants, maintenance workers, food service personnel and technical employees. Three research questions were posed: (a) What are the primary sources of job satisfaction and dissatisfaction for classified employees? (b) Is there a significant difference in job satisfaction among the specific categories of classified employees? (c) Are demographic/personal variables of classified employees related to overall job satisfaction? The study incorporated both qualitative and quantitative methodology. Focus groups were …

Chemistry Of Pentafluorothio (Sf5) Alkyl Derivatives, Rolf Walter Winter

Dissertations and Theses

Part I describes the preparation of a number of useful intermediates from the sultone F₅SCHCF₂OSO₂ (1). These intermediates include the following: the ketene F₅SC(SO₂)=C=O (21), the unique sultone F₄S=CCF₂OSO₂ (23), and various ionic intermediates of the form Y⁺ [F₅SC(SO₂F) COX]^-. These intermediates play an important role in providing new pathways for preparing fluorosulfonic acid precursors. Fluorosulfonic acids are excellent candidates to improve the efficiency of environmentally safe fuel cells. It was possible to obtain new derivatives of 1 by …

The Effect Of Two Viologens On The Solution Speciation Of Tetrakis([Rho]-Carboxyphenyl)Porphine, Suzanne Elizabeth Clarke

Dissertations and Theses

Porphyrins and viologens are often utilized in photocatalyzed electron transfer chemistry. Some of the problems faced by researchers in these applied studies include the lack of information correlating the porphyrin absorbance spectral changes with porphyrin dimerization, complexation, and the effect of noncomplexing cations. In addition, the efficiency of the system is greatly reduced by the formation of porphyrin:viologen association complexes. Knowledge of the values of these constants may allow selection of appropriate porphyrin:viologen concentration ratios which would enable optimization of these systems when used in such applications as artificial photosynthesis. This study reports the effect of selected salts and solvents …

Frequency-Dependent Seed Dispersal By Ants Of Two Deciduous Forest Herbs, Brent H. Smith, Catherine E. De Rivera, Cara Lin Bridgman, John J. Woid

Environmental Science and Management Faculty Publications and Presentations

Two co—occurring deciduous forest myrmecochores, Asarum canadense and Jeffersonia diphylla, release their seeds at approximately the same time, and therefore potentially compete for ants as dispersers. Within a single woodlot, we placed seeds of both species inside a dense Jeffersonia population away from Asarum plants, inside a dense Asarum population away from Jeffersonia plants, and in a site where plants of neither species occurred. No preference was exhibited by ants where natural populations were absent. Preference at the other two sites was frequency dependent: ants preferred seeds of the introduced species. Species preferred by ants have higher seed and …

Bethe Stopping-Power Theory For Heavy-Target Atoms, P.T. Leung

Physics Faculty Publications and Presentations

The Bethe stopping-power theory is considered in the context of heavy target atoms in which the relativistic effects of the target electrons are partially accounted for within the semirelativistic and independent-particle description. Numerical results show that, for target elements with large atomic numbers, these relativistic effects can become comparable with other corrections such as the shell correction, the Barkas effect, and the Bloch term.

Faculty Senate Monthly Packet October 1989, Portland State University Faculty Senate

Faculty Senate Monthly Packets

The October 1989 Monthly packet includes the October agenda and appendices and the Faculty Senate minutes and attachments from the meeting held June 1989.

Site Location Study For An Integrated Traffic Data Collection System: Phase 1 Report, Kenneth Dueker, Richard Ledbetter, Bruce Rex

Center for Urban Studies Publications and Reports

Improved technology for counting, classifying, and weighing vehicles in the highway traffic stream is becoming increasingly available. Research has been undertaken to make effective use of these new technologies, not just to replace current data collection programs of counting, classifying, and weighing with more efficient versions. This reports on the Phase I research, which had three major objectives;

• a literature review to guide the analysis of alternative methods;
• a statement of requirements to modernize and integrate the data collection programs of traffic counting, vehicle classification and truck weights, and to identify the type and use of traffic data for design, …

Post-Prior Symmetrical First-Order T Matrix For Charge Transfer, Jack C. Straton, M. D. Girardeau

Physics Faculty Publications and Presentations

The Fock-Tani Hamiltonian is found for systems containing two protons and one electron. It is shown that a post-prior symmetrical T-matrix element for a⁺ + (b⁺ c^-)→(a⁺ c^-)+b⁺ may be found from that of the simpler proton-proton-electron system if a and b are treated as isospin projections of a single type of nucleon. The Coulomb-exchange contribution to the inelastic (isospin flip) scattering of this system gives a first-order T matrix that is completely symmetrical with respect to post and prior interactions and orthogonalizations, a symmetry of the exact …

Recoil Distributions In Particle Transfer, James H. Mcguire, Jack C. Straton, W. J. Axmann, T. Ishihara, E. Horsdal

Physics Faculty Publications and Presentations

Classical Thomas peaks in various fast second-order particle transfer processes are quantum mechanically broadened by energy nonconservation in the intermediate states of collision. This quantum broadening is considered in observable velocity distributions of recoil particles.

Spontaneous Mode Locking In Long-Cavity Xenon Lasers, Manuela Fe Tarroja, Mohammad Sharafi, Lee W. Casperson

Electrical and Computer Engineering Faculty Publications and Presentations

Spontaneous mode locking in Fabry—Perot xenon lasers has been experimentally investigated for cavity lengths up to 66 m. Our results show dependence of the number of pulses per round-trip time on the cavity length and the excitation current. Other dynamical effects such as the ringing and modulation of the mode-locked pulses have been observed. A semiclassical model for the self-locking of an inhomogeneously broadened laser is also presented. Numerical results based on this model describe many dynamical features observed in our experiments.

Theory Of A Synchronously Pumped Mode-Locked Dye Laser In The Short Pump Pulse Limit, Duncan Leo Macfarlane, Lee W. Casperson

Electrical and Computer Engineering Faculty Publications and Presentations

We study the operation of a synchronously pumped mode-locked dye laser when the pump pulse is taken as a Dirac delta function, a limit that is sometimes experimentally reasonable. We find that in this limit the model simplifies considerably and that with further assumptions the physical interpretation of synchronously pumped mode-locked operation becomes apparent. Specifically, our nonlinear dynamical model reduces to the same set of equations that govern a prepumped Q-switched laser, and from this simple picture we are able to derive approximate analytic formulas for the synchronously pumped mode-locked laser pulse width and peak intensity. Additionally, we present a …

A Comparative Analysis Of The Expressive Acquisition Of Locative And Directional Prepositions Between Severely-To-Profoundly Hearing Impaired Children Utilizing Total Communication And The Oral/Aural Approach, Cathleen Pew Edwards

Dissertations and Theses

Prepositions are not only important in functional syntax; they also relate meanings associated with the concepts of place and time. Furthermore, prepositions are critical in such everyday activities as producing and comprehending directions, using maps and diagrams, and in the fields of mathematics and music. Inefficient use or misuse of prepositional spatial terms may hinder a child's progress in many areas. Expressive acquisition of function words, which include prepositions, has been described as significantly delayed in the hearing impaired populations.

The purpose of this study was to conduct a comparative preposition analysis between hearing impaired children using two different modes …

Analytically Reduced Form For The Class Of Integrals Containing Multicenter Products Of 1s Hydrogenic Orbitals, Coulomb Or Yukawa Potentials, And Plane Waves, Jack C. Straton

Physics Faculty Publications and Presentations

The class of integrals containing the product of N 1s hydrogenic orbitals and M Coulomb or Yukawa potentials with m plane waves is investigated analytically. The results obtained by Straton (1989) are extended and generalized. It is shown that the dimensionality of the entire class can be reduced from 3m to M+N-1.

Taylor Instability In Ryholite Lava Flows, B. A. Baum, W. B. Krantz, Jonathan H. Fink, R. E. Dickinson

Geology Faculty Publications and Presentations

A refined Taylor instability model is developed to describe the surface morphology of rhyolite lava flows. The effect of the downslope flow of the lava on the structures resulting from the Taylor instability mechanism is considered. Squire's (1933) transformation is developed for this flow in order to extend the results to three-dimensional modes. This permits assessing why ridges thought to arise from the Taylor instability mechanism are preferentially oriented transverse to the direction of lava flow. Measured diapir and ridge spacings for the Little and Big Glass Mountain rhyolite flows in northern California are used in conjunction with the model …

The Application Of The Ordered List Method And The Dynamic Programming To The Unit Commitment, Hoang Uong

Dissertations and Theses

The thesis presents a method of committing generating units in a hydro-thermal power system within practical computer resources such as computer time and data storage.

Faculty Senate Monthly Packet May 1989, Portland State University Faculty Senate

Faculty Senate Monthly Packets

The May 1989 Monthly packet includes the May agenda and appendices and the Faculty Senate minutes and attachments from the meeting held April 1989.

Decay Of Molecules At Corrugated Thin Metal Films, P.T. Leung, Young Sik Kim, Thomas F. George

Physics Faculty Publications and Presentations

The problem of the decay rate for molecules at corrugated thin metal films is considered theoretically via a classical phenomenological approach by generalization of a previous theory for a single rough surface. In particular, numerical results are worked out in detail for grating films with various possible arrangements of the two grating surfaces, and for both cases with a supported and a free-standing film. Effects due to cross coupling into the long- and short-range surface plasmons are observed, and correlations to recent experiments performed by Gruhlke, Holland, and Hall are made. It is suggested that fluorescence experiments with pulsed-laser excitations …

Fourier Transform Of The Multicenter Product Of 1s Hydrogenic Orbitals And Coulomb Or Yukawa Potentials And The Analytically Reduced Form For Subsequent Integrals That Include Plane Waves, Jack C. Straton

Physics Faculty Publications and Presentations

The Fourier transform of the multicenter product of N 1s hydrogenic orbitals and M Coulomb or Yukawa potentials is given as an (M+N-1)-dimensional Feynman integral with external momenta and shifted coordinates. This is accomplished through the introduction of an integral transformation, in addition to the standard Feynman transformation for the denominators of the momentum representation of the terms in the product, which moves the resulting denominator into an exponential. This allows the angular dependence of the denominator to be combined with the angular dependence in the plane waves.

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

Portland State Magazine

PSU’s alumni magazine, published quarterly. In this issue: New decisions in Portland’s higher education scene could lead to significant changes for the University; engineers and scientists are learning management insight and skills in a new master’s program; a PSU conference brings distinguished Soviet and Chinese scholars together to discuss their countries’ historic reform movements; retiring Professor Charlie White will be fondly remembered by students, colleagues and international scholars; and more.

Implementation And Database Issues Involved In Enhanced 9-1-1 Emergency Services And Rural Addressing Systems, Kenneth Dueker, George Mason, Rodney Jennings

Center for Urban Studies Publications and Reports

The purpose of this paper is to explore the transition from the 9-1-1 single number emergency service request system to an enhanced single number system. An enhanced system is one that displays the address of the telephone which is being used to report an emergency and uses that address to identify the correct unit for dispatch. Though the technology has been available for some time now, surprisingly few enhanced systems have been fully installed. Telephone company franchise and jurisdictional boundaries rarely coincide, making it difficult to achieve cooperation in bringing together governments and competitive telephone companies. Outlined below is an …

The Formation And Expansion Of High Technology Firms In Metropolitan Areas, Oliver Ikeotuonye Orjiako

Dissertations and Theses

The theme of high-technology economic base and regional development, around which this research is based, has been receiving increased attention from policy-makers and researchers in recent years. This partly reflects the reappraisal of the emerging structural changes which have been stimulated by the negative effects of the economic recessions of the past decade. It also reflects the rapid growth and expansion of high-technology firms in centers like the well-publicized Silicon Valley in California, Route 128 in Massachusetts, and the Research Triangle in North Carolina. Promoting a high-technology economic base thus has been widely adopted as a regional development policy for …

Pressure Dependence Of Ozone Interference In The Laser Fluorescence Measurement Of Oh In The Atmosphere [Comment], Thomas M. Hard, C. Y. Chan, A. A. Mehrabzadeh, Robert J. O'Brien

Chemistry Faculty Publications and Presentations

The authors comment on the paper by Shirinzadeh et al. (Applied Optics, vol. 26, p. 2102, 1987). They point out three errors which caused the overprediction of spurious HO data.

Slope Stability As Related To Geology At Rainier, Columbia County, Oregon, James Douglas Gless

Dissertations and Theses

Rainier, Oregon, has experienced problems in the development of residential and commercial sites, utilities, and transportation facilities as a result of slope instability. This study of slope stability at Rainier was conducted at the request of city officials.

Sediment Dynamics On The Shore Slopes Of The Puget Island Reach Of The Columbia River, Oregon And Washington, Timothy Abbe

Dissertations and Theses

Water waves generated by wind and ships; ebb tidal currents; water level fluctuations; and dredging impact sediment transport in shallow water of the lower Columbia River. Observations were made over a one-year period after sand dredged from the navigation channel was placed at three study sites in the Puget Island region, 46°15'N 123°25'W, Oregon and Washington. Sediment composition is fine to medium grained, low density dacitic volcanics with small percentages of pumice, heavy minerals, and basalt.

An Analysis Of The Inhibitory Effects Of Linolenic Acid Upon Photosystem Ii Of Higher Plants, Mark Edward Iven

Dissertations and Theses

This study utilizes steady state fluorescence measurements, flash-induced P680+ absorption transients, and DCIP reduction kinetics to study the inhibitory effects of linolenic acid (LA) upon Photosystem II (PSII) in whole spinach chloroplasts and insideout wheat thylakoids. It confirms the presence within PSII of LA-induced inhibition of energy trapping and/or primary charge separation (i.e., primary inhibition), in addition to donor side inhibition. The latter is diminished in the presence of 1,5-Diphenylcarbohydrazide (DPC) and probably takes place at the oxygen evolving complex. Primary inhibition, which is more controversial, probably occurs between Ph and QA, with a likely contribution at the level of …

Stratigraphy, Diagenesis, And Depositional Environment Of The Cowlitz Formation (Eocene), Northwest Oregon, Leonard Carl Farr Jr.

Dissertations and Theses

The Upper Eocene Cowlitz Formation is exposed in surface outcrops southwest of the town of Vernonia, in Columbia County, Oregon. The Cowlitz Formation also occurs in the subsurface of the Mist gas field where its Clark and Wilson (C and W) sandstone member (informal) acts as a natural gas reservoir, and its upper Cowlitz mudstone member (informal) acts as a cap rock. Surface exposures and continuous core were studied in order to determine Cowlitz Formation stratigraphy, and its depositional environment. Fresh core samples were also studied petrographically, and with a scanning electron microscope, in order to determine the effects of …

A Study Of Oxygen Precipitation In Heavily Doped Silicon, Robert Kurt Graupner

Dissertations and Theses

Gettering of impurities with oxygen precipitates is widely used during the fabrication of semiconductors to improve the performance and yield of the devices. Since the effectiveness of the gettering process is largely dependent on the initial interstitial oxygen concentration, accurate measurements of this parameter are of considerable importance. Measurements of interstitial oxygen following thermal cycles are required for development of semiconductor fabrication processes and for research into the mechanisms of oxygen precipitate nucleation and growth. Efforts by industrial associations have led to the development of standard procedures for the measurement of interstitial oxygen in wafers. However practical oxygen measurements often …

An Analysis Of The Relationship Between Learning Style Perceptual Preferences And Attitudes Toward Computer-Assisted Instruction, Mary Brambilla Mcfarland

Dissertations and Theses

The purpose of this investigation was to identify the perceptual learning style preferences of nursing students and to examine the relationship, if any, among students whose learning style perceptual preferences were identified as being auditory, tactile or visual and their attitudes toward the use of computer-assisted instruction (CAI) in the areas of comfort, creativity and function. The relationships between nursing students' perceptual learning style preferences and the following were also examined: (a) the amount of time they spent using the computer program, Cardiac Exam Bingo; (b) whether the use of the computer program added to their learning the content about …