Physical Sciences and Mathematics Commons^™

The Structures Of C-C4F8 And C-C4F8¯ And The Adiabatic Electron Affinity Of C-C4F8, Gordon A. Gallup

Gordon Gallup Publications

Calculations at the 6311G(dps) level have been used to elucidate the structures of octafluorocyclobutane c-C₄F₈ and its negative ion c-C₄F₈^¯. With no empirical adjustments, we obtain 0.640 eV for the adiabatic electron affi nity of c-C₄F₈. This may be compared with an experimental value of 0.63 ± 0.05 eV from the FALP method. c-C₄F₈ has unusual features in that there is an increase in symmetry, D_2d to D_4h, in going from the neutral molecule to the negative ion, and …

Characterizing The Regulatory Environment Affecting The Forest Products Industry In California, Richard Thompson, Christopher Dicus

Natural Resources Management and Environmental Sciences

No abstract provided.

Mechanism And Control Of High-Intensity-Laser-Driven Proton Acceleration, T. Lin, K. Flippo, M. Rever, Anatoly Maksimchuk, Donald P. Umstadter

Donald Umstadter Publications

We discuss the optimization and control of laser-driven proton beams. Specifically, we report on the dependence of high-intensity laser accelerated proton beams on the material properties of various thin-film targets. Evidence of star-like filaments and beam hollowing (predicted from the electrothermal instability theory) is observed on Radiochromic Film (RCF) and CR-39 nuclear track detectors. The proton beam spatial profile is found to depend on initial target conductivity and target thickness. For resistive target materials, these structured profiles are explained by the inhibition of current, due to the lack of a return current. The conductors, however, can support large propagating currents …

Nonlinear Parallel And Perpendicular Diffusion Of Charged Cosmic Rays In Weak Turbulence, Andreas Schalchi, John William Bieber, William H. Matthaeus, Gang Qin

Aerospace, Physics, and Space Science Faculty Publications

The problem of particle transport perpendicular to a magnetic background field is well known in cosmic-ray astrophysics. Whereas it is widely accepted that quasi-linear theory (QLT) of particle transport does not provide the correct results for perpendicular diffusion, it was assumed for a long time that QLT is the correct theory for parallel diffusion. In the current paper we demonstrate that QLT is in general also incorrect for parallel particle transport if we consider composite turbulence geometry. Motivated through the recent success of the so-called nonlinear guiding center theory of perpendicular diffusion, we present a new theory for parallel and …

The Nuclear Reddening Curve For Active Galactic Nuclei And The Shape Of The Infrared To X-Ray Spectral Energy Distribution, C. Martin Gaskell, René W. Goosmann, Robert R. J. Antonucci, David H. Whysong

Department of Physics and Astronomy: Faculty Publications

We present extinction curves derived from the broad emission lines and continua of samples of 72 radio-loud and 1018 radio-quiet active galactic nuclei (AGNs). The curves are significantly flatter in the UV than curves for the local interstellar medium. The reddening curves for the radio-quiet Large Bright Quasar Survey quasars are slightly steeper than those of the radio-loud quasars in the UV, probably because of additional reddening by dust farther out in the host galaxies of the former. The UV extinction curves for the radio-loud AGNs are very flat. This is explicable with slight modifications to standard Mathis-Rumpl-Nordsieck dust models: …

Calcium Responses Of Chicken Trigeminal Ganglion Neurons To Methyl Anthranilate And Capsaicin, Michael L. Kirifides, Michael P. Kurnellas, Larry Clark, Bruce P. Bryant

United States Department of Agriculture Wildlife Services: Staff Publications

Using digital fluorescence imaging, we determined the effects of methyl anthranilate (MA), an avian irritant, and capsaicin (CAP), a mammalian irritant, on intracellular calcium ([Ca2+]i) in chicken trigeminal neurons. Concentration–response functions indicated that the threshold for inducing increases in [Ca2+]i was higher for CAP (30·mmol·l–1) than for MA (10·mmol·l–1). The maximum magnitudes of [Ca2+]i in response to MA and CAP were compared after normalization to 40·mmol·l–1 KCl. At equal concentrations (300·mmol·l–1), trigeminal neurons responded with a greater change in [Ca2+]i to MA (78% of KCl) than to CAP (43% of KCl). Furthermore, at 300·mmol·l–1, 48% of neurons responded to MA …

Bicistronic And Fused Monocistronic Transcripts Are Derived From Adjacent Loci In The Arabidopsis Genome, Jyothi Thimmapuram, Hui Duan, Lei Liu, Mary A. Schuler

Cyber Center Publications

Comparisons of full-length cDNAs and genomic DNAs available for Arabidopsis thaliana described here indicate that some adjacent loci are transcribed into extremely long RNAs spanning two annotated genes. Once expressed, some of these transcripts are post-transcriptionally spliced within their coding and intergenic sequences to generate bicistronic transcripts containing two complete open reading frames. Others are spliced to generate monocistronic transcripts coding for fusion proteins with sequences derived from both loci. RT-PCR of several P450 transcripts in this collection indicates that these extended transcripts exist side by side with shorter monocistronic transcripts derived from the individual loci in each pair. The …

Tandem Intramolecular Nicholas And Pauson-Khand Reactions For The Synthesis Of Tricyclic Oxygen-Containing Heterocycles, Miriam M. Quintal, Kristina D. Closser, Kevin M. Shea

Chemistry: Faculty Publications

Simple acyclic enynes can be easily converted into tricyclic ethers upon treatment with Co2(CO)8followed by Nicholas and Pauson−Khand reactions. Tricyclic [5,8,5]- and [5,7,5]-systems can be prepared in high overall yields in only seven synthetic steps.

Cross Sections And Rosenbluth Separations From Kaon Electroproduction On Protons Up To Q²=2.35 (Gev/C)², Marius Coman

FIU Electronic Theses and Dissertations

The kaon electroproduction reaction H(e, e'K⁺)Λ was studied as a function of the four momentum transfer, Q², for different values of the virtual photon polarization parameter. Electrons and kaons were detected in coincidence in two High Resolution Spectrometers (HRS) at Jefferson Lab. Data were taken at electron beam energies ranging from 3.4006 to 5.7544 GeV. The kaons were identified using combined time of flight information and two Aerogel Čerenkov detectors used for particle identification. For different values of Q² ranging from 1.90 to 2.35 GeV/c² the center of mass cross sections for the …

Bell’S Inequalities For Particles Of Arbitrary Spin In Fixed Analyzers, Ronen Mukamel, John C. Howell

Mathematics, Physics, and Computer Science Faculty Articles and Research

We propose a new set of observables for experiments on entangled particles of arbitrarily large spin that produce significant Clauser-Horne-Shimony-Holt inequality violations for fixed analyzer settings over a wider range of spins than was previously possible. These observables are better suited for experiments where analyzer orientations must be chosen before the spin of the entangled particles is known, such as experiments using polarization entangled downconverted photons.

Combination Of Cdf And D0 Results On The W Boson Mass And Width, Darin Acosta, Kenneth A. Bloom, Collider Detector At Fermilab Collaboration

Kenneth Bloom Publications

The results based on 1992–95 data (Run 1) from the CDF and D0 experiments on the measurements of the W boson mass and width are presented, along with the combined results. We report a Tevatron collider average M_W =80.456±0.059 GeV. We also report the Tevatron collider average of the directly measured W boson width Γ_W=2.115±0.105 GeV. We describe a new joint analysis of the direct W mass and width measurements. Assuming the validity of the standard model, we combine the directly measured W boson width with the width extracted from the ratio of W and Z boson …

Fueling Loading And Potential Fire Behavior After Selective Harvest In Coast Redwood Stands, Christopher Dicus

Natural Resources Management and Environmental Sciences

No abstract provided.

Synthesizing Realistic Spine Motion Using Traditional Rig Controllers, Jabbar Raisani

Computer Science Honors Theses

This thesis presents a specific method for simulating realistic spine motion through the use of traditional rig control objects. The spine's motion and flexibility is based on a curve as opposed to the more traditional three bone spine. This allows for a more fluid animation more closely resembling that of a spinal column. However, this setup keeps the traditional three control rig setup in order to mimic the control system of a traditional three bone spine. Currently, three bone systems are well understood by animators and the motion is easy to control. The problem with this setup is that although …

Perceptual Evaluation Of Point-Based Object Representation, Paul Schwarz

Computer Science Honors Theses

Researchers have proposed several methods of representing three-dimensional objects in computer memory along with different methods of displaying these objects on two-dimensional computer displays. Using a polygon-based representation that linearly interpolates between a set of sample points is by far the most popular way of representing objects today, mostly because of its ability to display an object on a computer screen at a fast and consistent rate. However, as graphics hardware increases in speed, polygon-based models prove to be increasingly inefficient. Point-based representations have been proposed that consist of densely sampling some surface and using solely the samples to portray …

Choice Of Monitoring Mechanism For Optimal Nonparametric Functional Estimation For Binary Data, Nicholas P. Jewell, Mark J. Van Der Laan, Stephen Shiboski

U.C. Berkeley Division of Biostatistics Working Paper Series

Optimal designs of dose levels in order to estimate parameters from a model for binary response data have a long and rich history. These designs are based on parametric models. Here we consider fully nonparametric models with interest focused on estimation of smooth functionals using plug-in estimators based on the nonparametric maximum likelihood estimator. An important application of the results is the derivation of the optimal choice of the monitoring time distribution function for current status observation of a survival distribution. The optimal choice depends in a simple way on the dose response function and the form of the functional. …

Topology Control In Heterogeneous Ad-Hoc Networks, G. Srivastava, P. Boustead, Joe F. Chicharo

Faculty of Informatics - Papers (Archive)

Topology control in an ad-hoc network can provide better spatial reuse of the wireless channel and conserve power. Topology construction and maintenance is a challenging issue. A number of distributed topology control algorithms have been proposed to remove the need of a centralised controller. Distributed algorithms such as location information no topology (LINT), location information link state topology (LILT) and mobile-grid (MG), aim to achieve overall network connectivity and low transmission range by maintaining a minimum node degree value. In the case of a non-uniform node distribution, maintaining a minimum node degree can unnecessarily partition a network. In this paper, …

The Price We Pay For Using Tcp, D. King, K. Walker, D. Platt

Faculty of Informatics - Papers (Archive)

This paper examines a hop-by-hop flow control scheme and compares it with the operation of TCP end-to-end flow control. The individual link control scheme is described. Both schemes are simulated under bursty traffic in a network with 50 nodes and 96 links. It is found that the hop-by-hop scheme results in similar levels of utilization to TCP, but that the average queue size is 30 times smaller.

Does The Halting Necessary For Hardware Trace Collection Inordinately Perturb The Results?, Myles G. Watson

Theses and Dissertations

Processor address traces are invaluable for characterizing workloads and testing proposed memory hierarchies. Long traces are needed to exercise modern cache designs and produce meaningful results, but are difficult to collect with hardware monitors because microprocessors access memory too frequently for disks or other large storage to keep up. The small, fast buffers of the monitors fill quickly; in order to obtain long contiguous traces, the processor must be stopped while the buffer is emptied. This halting may perturb the traces collected, but this cannot be measured directly, since long uninterrupted traces cannot be collected. We make the case that …

Online Bandwidth Auctions For Efficient Allocation Of Bandwidth, Ying Peng Que, D. Platt

Faculty of Informatics - Papers (Archive)

This paper describes an on-line auction process for dynamic bandwidth allocation in communication networks. The auction is intended to be repeated at short (perhaps ten minute) intervals. The outcome of the auction gives both the bandwidth allocation, and the price to be paid for it. The network is assumed to be MPLS capable, and two variations are provided, one in which a single LSP is available between each source/destination pair, and another in which multiple LSPs are available. We show that the present algorithms are scalable up to about 150 nodes.

Additive-Assisted Cerium-Based Electrolytic Coating Process For Corrosion Protection Of Aluminum Alloys, James O. Stoffer, Thomas J. O'Keefe, Eric L. Morris, Scott Hayes, Paul Yu, Alex Williams, Xuan Lin

Chemistry Faculty Research & Creative Works

The corrosion resistance of an aluminum or aluminum alloy component is enhanced by immersing an aluminum alloy to act as a cathode and an oxygen-evolving anode in an electrolyte comprising water, cerium ions, and an additive selected from among animal gelatin, derivatives of animal gelatin, and amino acids, then passing an electrical current through the electrolyte to deposit a cerium-based coating onto the aluminum-based component.

1-Hyperbolic Projection For User Interfaces, Alexander Kolliopoulos

Computer Science Honors Theses

The problem of dealing with representations of information that does not fit conveniently within allotted screen space is pervasive in graphical interfaces. While there are techniques for dealing with this problem in various ways, some properties of such existing techniques are not satisfying. For example, global structure of information may be lost in favor of local focus, or information may not be mapped into a rectangular area. The 1-hyperbolic interface is proposed to deal with some of these deficiencies, and the mathematics involved in display and interaction are derived. The calculations necessary for this interface are easy to implement, and …

Red Rock Desert Learning Center Core Group Meeting: November 16, 2004, Red Rock Desert Learning Center

Reports (RRLC)

1. Introductions (5 min.)
2. Approval of Minutes from October 19 Meeting (5 minutes)
3. Presentation of Biology Curriculum Strands – Paul Buck (15 min.)
4. Discussion of Possible Advisory Board Structures – Michael Reiland (15 min.)
5. Update from Line and Space Architects – Les Wallach/Henry Tom (20 min.)
6. Discussion of Student Risk Analysis/Liability Issues (15 min.)
7. Standing Reports (10 minutes)
   A. UNLV/CESU Update – Nancy Flagg
   B. BLM Update – Michael Reiland
8. Committee Reports (5 min.)
   A. Building Committee – Angie Lara
9. Open Discussion / New Business (5 min.)
   A. January Meeting – Tuesday, January 18, 10:30 a.m., UNLV Paradise
   Campus
   B. Core …

Real-Time Image Enhancement Using Texture Synthesis, Matthew J. Sorensen

Theses and Dissertations

This thesis presents an approach to real-time image enhancement using texture synthesis. Traditional image enhancement techniques are typically time consuming, lack realistic detail, or do not scale well for large magnification factors.

Real-time Enhancement using Texture Synthesis (RETS) combines interpolation, classification, and patch-based texture synthesis to enhance low-resolution imagery, particularly aerial imagery. RETS uses as input a low-resolution source image and several high-resolution sample textures. The output of RETS is a high-resolution image with the structure of the source image, but with detail consistent with the high-resolution sample textures. We show that RETS can enhance large amounts of imagery in …

On Marginalized Multilevel Models And Their Computation, Michael E. Griswold, Scott L. Zeger

Johns Hopkins University, Dept. of Biostatistics Working Papers

Clustered data analysis is characterized by the need to describe both systematic variation in a mean model and cluster-dependent random variation in an association model. Marginalized multilevel models embrace the robustness and interpretations of a marginal mean model, while retaining the likelihood inference capabilities and flexible dependence structures of a conditional association model. Although there has been increasing recognition of the attractiveness of marginalized multilevel models, there has been a gap in their practical application arising from a lack of readily available estimation procedures. We extend the marginalized multilevel model to allow for nonlinear functions in both the mean and …

An Extension Of The Quasicontinuum Treatment Of Multiscale Solid Systems To Nonzero Temperature, Dennis J. Diestler, Z.-B. Wu, Xiao Cheng Zeng

Xiao Cheng Zeng Publications

Covering the solid lattice with a finite-element mesh produces a coarse-grained system of mesh nodes as pseudoatoms interacting through an effective potential energy that depends implicitly on the thermodynamic state. Use of the pseudoatomic Hamiltonian in a Monte Carlo simulation of the two-dimensional Lennard-Jones crystal yields equilibrium thermomechanical properties (e.g., isotropic stress) in excellent agreement with “exact” fully atomistic results.

Azaadamantane Benzamide 5-Ht4 Agonists: Gastrointestinal Prokinetic Sc-54750, Daniel Becker, Daniel L. Flynn, Robert L. Shone, Gary Gullikson

Chemistry: Faculty Publications and Other Works

Azaadamantanone 1 was converted to a series of aminoazaadamantane benzamides 9a–d, which were profiled for serotonin receptor activity. Aminomethylazaadamantane SC-54750 is a potent 5-HT4 agonist and 5-HT3 antagonist with in vivo efficacy in gastroparesis models and also inhibits cisplatin-induced emesis.

Substructure Dependence Of Jet Cross Sections At Hera And Determination Of ΑS, S. Chekanov, M. Derrick, J. H. Loizides, S. Magill, S. Miglioranzi, B. Musgrave, J. Repond, R. Yoshida, Margarita C. K. Mattingly, N. Pavel, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, A. Margotti, A. Montanari, R. Nania, F. Palmonari, A. Pesci, L. Rinaldi

Faculty Publications

No abstract provided.

Semiparametric Binary Regression Under Monotonicity Constraints, Moulinath Banerjee, Pinaki Biswas, Debashis Ghosh

The University of Michigan Department of Biostatistics Working Paper Series

Summary: We study a binary regression model where the response variable $\Delta$ is the indicator of an event of interest (for example, the incidence of cancer) and the set of covariates can be partitioned as $(X,Z)$ where $Z$ (real valued) is the covariate of primary interest and $X$ (vector valued) denotes a set of control variables. For any fixed $X$, the conditional probability of the event of interest is assumed to be a monotonic function of $Z$. The effect of the control variables is captured by a regression parameter $\beta$. We show that the baseline conditional probability function (corresponding to …

How (West) Hollywood Adds Up: A Queer Theoretical View Of Mathematics And Mathematicians In Film, Christopher D. Goff

College of the Pacific Faculty Presentations

No abstract provided.

What Are The Building Blocks Of Our Universe?, Kameshwar C. Wali

Physics - All Scholarship

We are told that we are living in a Golden Age of Astronomy. Cosmological Parameters are found with un precedented accuracy. Yet, the known form of matter forms only a small fraction of the total energy density of the universe. Also, a mysterious dark energy dominates the universe and causes acceleration in the rate of expansion.