Digital Commons Network^™

An Analysis Of Temperature Dependent Photoluminescence Line Shapes In Ingan, John S. Colton, K. L. Teo, P. Y. Yu, E. R. Weber, M. F. Li, W. Lui, K. Uchida, H. Tokunaga, N. Akutsu, K. Matsumoto

Faculty Publications

Photoluminescence (PL) line shapes in InGaN multiple quantum well structures have been studied experimentally and theoretically between 10 and 300 K. The higher temperature PL spectra can be fitted qualitatively with a thermalized carrier distribution and a broadened joint-density-of-states. The low temperature PL line shapes suggest that carriers are not thermalized, as a result of localization by band-gap fluctuations. We deduce a localization energy of ~7 meV as compared with an activation energy of ~63 meV from thermal quenching of the PL intensity. We thus conclude that this activation energy and the band-gap fluctuation most likely have different origins.

Chemical Signals From Submarine Fluid Advection Onto The Continental Shelf, W. S. Moore, Timothy J. Shaw

Faculty Publications

No abstract provided.

Catalogs Of Temperatures And [Fe/H] Averages For Evolved G And K Stars, B. J. Taylor

Faculty Publications

A catalog of mean values of [Fe/H] for evolved G and K stars is described. The zero point for the catalog entries has been established by using differential analyses. Literature sources for those entries are included in the catalog. The mean values are given with rms errors and numbers of degrees of freedom, and a simple example of the use of these statistical data is given. For a number of the stars with entries in the catalog, temperatures have been determined. A separate catalog containing those data is briefly described.

Unitary Representations Of Lie Groups With Reflection Symmetry, Palle E.T. Jorgensen, Gestur Ólafsson

Faculty Publications

We consider the following class of unitary representationsπof some (real) Lie groupGwhich has a matched pair of symmetries described as follows: (i) SupposeGhas a period-2 automorphismτ, and that the Hilbert spaceH(π) carries a unitary operatorJsuch thatJπ=(πτ)J(i.e.,selfsimilarity). (ii) An added symmetry is implied ifH(π) further contains a closed subspaceK0having a certainorder-covarianceproperty, and satisfying theK0-restricted positivity : vJv≥0, ∀v∈K0, where ·· is the inner product inH(π). From (i)-(ii), we get an induced dual representation of an associated dual groupGc. All three properties, selfsimilarity, order-covariance, and positivity, are satisfied in a natural context whenGis semisimple and hermitean; but whenGis the (ax+b)-group, or the …

Metal-Based Chirality And Spin State Change In 16-Electron Cpml2 Systems: A Computational Study Of Cpw(No)(Ph3), Kevin M. Smith, Rinaldo Poli, Peter Legzdins

Faculty Publications

Density functional theory calculations indicate that CpW(NO)(PH3) possesses a planar triplet ground state, a result with significant implications for the inversion of configuration of 16e, d6 CpML2 species.

The Role Of Air Cargo In California's Goods Movement, H.-S. Jacob Tsao

Faculty Publications

Caltrans began a systematic investigation into the role of air cargo in California’s goods movement, as part of the larger development effort for a statewide goods movement strategy, and funded a research project in 1997 for the Institute of Transportation Studies at U.C. Berkeley to (i) gain a broader understanding of the State’s air cargo industry and the role of air cargo in California’s goods movement, (ii) assess the importance of air cargo to the State’s economy, (iii) begin identification of issues hindering efficient air cargo movement in the State, and (iv) explore possible State roles for resolving the issues. …

Hematite And Calcite Coatings On Fossil Vertebrates, Huiming Bao, Paul L. Koch, Robert P. Hepple

Faculty Publications

Hematite coatings are common on vertebrate fossils from Paleocene/Eocene paleosol deposits in the Bighorn Basin, Wyoming. In general, hematite coatings are found only on fossils and are limited to soils exhibiting hydromorphic features and moderate maturity. Petrographic and isotopic evidence suggests that hematite and micritic calcite formed at nearly the same time in a pedogenic environment, whereas sparry calcite formed later at greater burial depths. The parent material of paleosols is rich in iron, supplying an ample source of iron for hematite formation. Decomposition of animal tissues around bones may enhance the weathering of iron-bearing minerals in soils surrounding carcasses, …

Academic Comparison Of Athletes And Non-Athletes In A Rural High School, Holt E Zaugg

Faculty Publications

This study compares academic performance, behavior, and commitment of basketball and volleyball athletes and non-athletes in a rural Canadian high school. It compares mid-term and final grades in each school discipline; visits to an administrator for disciplinary visits; and demerit points for improper behavior; and estimates the mean weekly time commitment for athletes in each sport.

The Sharp Sobolev Inequality And The Banchoff-Pohl Inequality On Surfaces, Ralph Howard

Faculty Publications

No abstract provided.

Hematite And Calcite Coatings On Fossil Vertebrates, Huiming Bao, Paul L. Koch, Robert P. Hepple

Faculty Publications

Hematite coatings are common on vertebrate fossils from Paleocene/Eocene paleosol deposits in the Bighorn Basin, Wyoming. In general, hematite coatings are found only on fossils and are limited to soils exhibiting hydromorphic features and moderate maturity. Petrographic and isotopic evidence suggests that hematite and micritic calcite formed at nearly the same time in a pedogenic environment, whereas sparry calcite formed later at greater burial depths. The parent material of paleosols is rich in iron, supplying an ample source of iron for hematite formation. Decomposition of animal tissues around bones may enhance the weathering of iron-bearing minerals in soils surrounding carcasses, …

Christian Plain Style: The Evolution Of A Spiritual Ideal, Jameela A. Lares

Faculty Publications

No abstract provided.

Library Home Page Design: A Comparison Of Page Layout For Front-Ends To Arl Library Web Sites, David L. King

Faculty Publications

The author examined the home pages of all 120 libraries in the Association of Research Libraries (ARL) in order to compare design similarities and differences. This was accomplished by first filling out a questionnaire on each home page and then tabulating the findings using simple averages and medians. Areas examined were: backgrounds, document headers, document footers, document body, page length, number of steps to library home page from parent institution Web site, and domain name servers. A typical home page is discussed using the averages of these results.

Pareto Optimality And The Rule Of Law, Noel B. Reynolds

Faculty Publications

In 1959, James M. Buchanan criticized the collectivist misuse of Pareto optimality by the "new welfare economists" and made a first attempt to extend that individualist concept into the political realm. Over the following three decades he further developed his political application of Pareto’s insight to buttress an essentially economic analysis of political exchange that would justify the processes of constitutional democracy in the same way Pareto efficiency justifies free markets. In this paper I will explain why Buchanan’s particular formulations will not work and propose a more comprehensive solution that accomplishes Buchanan’s announced purpose. I will argue that a …

Correlation Function Formulation For The State Selected Total Reaction Probability, Sophya Garashchuk, David J. Tannor

Faculty Publications

Investigates the correlation function formulation for the state selected total reaction probability. Discussion of the wave packet propagation; Derivation of the correlation function expression for the N[sub alpha](E); Application of quantum-mechanical and Herman-Kluk propagation methods.

Search For Selectron And Squark Production In E+P Collisions At Hera, J. Breitweg, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, R. Yoshida, H. Zhang, Margarita C. K. Mattingly, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Laurenti

Faculty Publications

We have searched for the production of a selectron and a squark in e+p collisions at a center-of-mass energy of 300 GeV using the ZEUS detector at HERA. The selectron and squark are sought in the direct decay into the lightest neutralino in the framework of supersymmetric extensions to the Standard Model which conserve R-parity. No evidence for the production of supersymmetric particles has been found in a data sample corresponding to 46.6 pb-1 of integrated luminosity. We express upper limits on the product of the cross section times the decay branching ratios as excluded regions in the parameter space …

A Cloned Erwinia Chrysanthemi Hrp (Type Iii Protein Secretion) System Functions In Escherichia Coli To Deliver Pseudomonas Syringae Avr Signals To Plant Cells And To Secrete Avr Proteins In Culture, Jong Hyun Ham, David W. Bauer, Derrick E. Fouts, Alan Collmer

Faculty Publications

The Hrp (type III protein secretion) system is essential for the plant parasitic ability of Pseudomonas syringae and most Gram-negative bacterial plant pathogens. AvrB and AvrPto are two P. syringae proteins that have biological activity when produced via heterologous gene expression inside plant cells or when produced by Hrp+ bacteria. Art-like proteins, presumably injected by the Hrp system on bacterial contact with plant cells, appear to underlie pathogenic interactions, but none has been observed outside of the bacterial cytoplasm, and identifying novel genes encoding them is tedious and uncertain without a phenotype in culture. Here we describe a cloned Hrp …

Dynamics And Energetics Of Bubble Growth In Magmas: Analytical Formulation And Numerical Modeling, Alexander A. Prusevich, Dork L. Sahagian

Faculty Publications

We have developed a model of diffusive and decompressive growth of a bubble in a finite region of melt which accounts for the energetics of volatile degassing and melt deformation as well as the interactions between magmatic system parameters such as viscosity, volatile concentration, and diffusivity. On the basis of our formulation we constructed a numerical model of bubble growth in volcanic systems. We conducted a parametric study in which a saturated magma is instantaneously decompressed to one bar and the sensitivity of the system to variations in various parameters is examined. Variations of each of seven parameters over practical …

The Coming Forth Of The Book Of Mormon In The Twentieth Century, Noel B. Reynolds

Faculty Publications

I hope this study, however preliminary it might appear, will provide a sound first step toward developing our self-understanding as Latter-day Saints of the history of Book of Mormon use in the twentieth century and the phenomenal increase in understanding, appreciation, and study that has taken place over the last three to four decades. This study may also offer one useful perspective for the gradually emerging history of cultural Mormonism and its antipathy to the Book of Mormon. This study is grounded in the analysis of a number of possible indicators of intensity of interest in the Book of Mormon …

Researching Cases On The Web, Douglas E. Abrams

Faculty Publications

No abstract provided.

Weak Maps And Stabilizers Of Classes Of Matroids, James Geelen, James Oxley, Dirk Vertigan, Geoff Whittle

Faculty Publications

LetFbe a field and letNbe a matroid in a class N ofF-representable matroids that is closed under minors and the taking of duals. ThenNis anF-stabilizer for N if every representation of a 3-connected member of N is determined up to elementary row operations and column scaling by a representation of any one of itsN-minors. The study of stabilizers was initiated by Whittle. This paper extends that study by examining certain types of stabilizers and considering the connection with weak maps. The notion of a universal stabilizer is introduced to identify the underlying matroid structure that guarantees thatNwill be anF′-stabilizer for …

Scope Of The Uniform Commerical Code; Survey Of Computer Contracting Cases, William J. Woodward Jr., Amelia H. Boss

Faculty Publications

No abstract provided.

Evaluation Of Personal Communications Dual-Antenna Handset Diversity Performance, Michael A. Jensen, Joseph S. Colburn, Yahya Rahmat-Samii, Gregory J. Pottie

Faculty Publications

In personal wireless communications systems, multipath propagation has a significant effect on system design and performance. Signal strength fading caused by destructive interference between multiple replicas of the signal of interest arriving at the receiver over different paths often is the limiting factor in system range/fidelity. Antenna diversity is one technique that can be used to help overcome multipath fading. This paper presents a description of experiments, data processing, and results used to evaluate the diversity performance of three candidate dual-antenna handset configurations: two side-mounted planar-inverted F antennas (PIFAs), a back-mounted PIFA with a top-mounted helix, a top-mounted PIFA, and …

Overcoming Tradition And Modernity: The Search For Islamic Authenticity, By Robert D. Lee, Shahrough Akhavi

Faculty Publications

No abstract provided.

Optimized Boundary Conditions And Data Assimilation With Application To The M-2 Tide In The Yellow Sea, Igor Shulman, James K. Lewis, Alan F. Blumberg, B. Nicholas Kim

Faculty Publications

An optimization approach is derived for assimilating tidal height information along the open boundaries of a numerical model. The approach is then extended so that similar data along transects inside a model domain can also be optimally assimilated. To test the application of such an optimized methodology, M-2 tidal simulations were conducted with a numerical ocean model of the Yellow Sea, an area with a strong tidal influence. The use of the optimized open boundary conditions and internal data assimilation leads to a significant improvement of the predictive skill of the model. Average errors can be reduced by up to …

Orientational Susceptibility And Elastic Constants Near The Nematic-Isotropic Phase Transition For Trimers With Terminal-Lateral-Lateral-Terminal Connections, Daeseung Kang, Milind P. Mahajan, Rolfe G. Petschek, Charles Rosenblatt, Chaobin He, Puwei Lu, A.C. Griffin

Faculty Publications

Magnetically induced Freedericksz measurements were performed in the nematic liquid crystal phase to extract the elastic constants of a terminal-lateral-lateral-terminal trimer, i.e., a trimer in which the connections to the first and third mesogens are at the end of the mesogen and both attachments to the central mesogen are lateral. Polymeric liquid crystals based on this unit have negative Poisson ratios. Additionally, electric field Kerr measurements were performed in the isotropic phase to extract the orientational susceptibility. The elastic constants were found to be similar to values obtained for typical monomers, albeit with a slightly enhanced ratio K-33/K-11 and reduced …

Chesapeake Bay Watershed Model Application And Calculation Of Nutrient And Sediment Loadings. Appendix H: Tracking Best Management Practice Nutrient Reductions In The Chesapeake Bay Program, Michael W. Palace, James E. Hannawald, Lewis C. Linker, Gary W. Shenk, Jennifer M. Storrick, Michael L. Clipper

Faculty Publications

No abstract provided.

What Is School For? Dilemmas Of Secondary Education In Bush Alaska, Lawrence C. Hamilton

Faculty Publications

The remote towns and villages of bush Alaska confront dilemmas in the design of secondary education. Systems based on a single statewide boarding school, or alternatively on small schools in each individual community, have both been tried. Debates about these two approaches reflect a more basic question: What is the purpose of secondary education? Should it (A) prepare students to become functional members of their home communities, or (B) prepare them to compete for education and jobs elsewhere? This question has implications for all aspects of educational design, and indeed for the future of rural villages themselves.

A paper presented …

Nonlinear Optimal Control Design Of A Missile Autopilot, Tim Mclain, Randal W. Beard

Faculty Publications

The application of a new nonlinear optimal control strategy to the design of missile autopilots is presented. The control approach described and demonstrated here is based upon the numerical solution of the Hamilton-Jacobi-Bellman equation by Successive Galerkin Approximation. Using this approach, feedback controllers are computed by an iterative application of a numerical Galerkin-type PDE solver. Simulation results demonstrating the application of this approach to the design of a missile autopilot are presented.

The Three-Species Monomer-Monomer Model In The Reaction-Controlled Limit, Kevin E. Bassler, Dana A. Browne

Faculty Publications

We study the one-dimensional three-species monomer-monomer reaction model in the reaction-controlled limit using mean-field theory and dynamic Monte Carlo simulations. The phase diagram consists of a reactive steady state bordered by three equivalent adsorbing phases where the surface is saturated with one monomer species. The transitions from the reactive phase are all continuous, while the transitions between adsorbing phases are first order. Bicritical points occur where the reactive phase simultaneously meets two adsorbing phases. The transitions from the reactive to an adsorbing phase show directed percolation critical behaviour, while the universal behaviour at the bicritical points is in the even …

An Anniversary Meditation, Richard M. Davidson

Faculty Publications

No abstract provided.