Digital Commons Network^™

Seasonal Migration And Genetic Population Structure In House Wrens, Nidia Arguedas, Patricia G. Parker

Condor

No abstract provided.

Reducing Mass Degeneracy In Sar By Ms By Stable Isotopic Labeling, Chris Bailey-Kellogg, John J. Kelley Iii, Cliff Stein, Bruce Randall Donald

Dartmouth Scholarship

Mass spectrometry (MS) promises to be an invaluable tool for functional genomics, by supporting low-cost, high-throughput experiments. However, large-scale MS faces the potential problem of mass degeneracy -- indistinguishable masses for multiple biopolymer fragments (e.g. from a limited proteolytic digest). This paper studies the tasks of planning and interpreting MS experiments that use selective isotopic labeling, thereby substantially reducing potential mass degeneracy. Our algorithms support an experimental-computational protocol called Structure-Activity Relation by Mass Spectrometry (SAR by MS), for elucidating the function of protein-DNA and protein-protein complexes. SAR by MS enzymatically cleaves a crosslinked complex and analyzes the resulting mass spectrum …

Two-Level Atom In An Optical Parametric Oscillator: Spectra Of Transmitted And Fluorescent Fields In The Weak Driving Field Limit, James P. Clemens, Perry R. Rice, Pranaw Kumar Rungta, Robert J. Brecha

Physics Faculty Publications

We consider the interaction of a two-level atom inside an optical parametric oscillator. In the weak-driving-field limit, we essentially have an atom-cavity system driven by the occasional pair of correlated photons, or weakly squeezed light. We find that we may have holes, or dips, in the spectrum of the fluorescent and transmitted light. This occurs even in the strong-coupling limit when we find holes in the vacuum-Rabi doublet. Also, spectra with a subnatural linewidth may occur. These effects disappear for larger driving fields, unlike the spectral narrowing obtained in resonance fluorescence in a squeezed vacuum; here it is important that …

Photophysical Study Of Linked 1,4,7-Triazacyclonane Cr (Iii) Complexes, Weizhen Tu

Masters Theses

A series of mono and bimetallic Cr(III) complexes based on the 1,4,7- triazacyclonoane(TACN) were prepared. Complexes of the Cr(TACN)X₃ , and Cr₂(DTNE)X₆ demonstrated marked difference of photophysical properties on the nature of X. In cases where X is more easily oxidized, enhanced extinction coefficient in the ⁴A₂ ➔ ²T, absorption and larger quantum yield of emission at 77K were observed in the dimer complexes. Shorter lifetime and enhanced decay rate were also found in the dimer complexes suggests that there might exists weak coupling behavior between the two Cr(III) metal cents in the …

Unofficial Grapevine, August 2000, University Of South Florida St. Petersburg.

Unofficial Grapevine

The August 2000 issue of the Unofficial Grapevine.

H-1 Nuclear Magnetic Resonance Spin-Lattice Relaxation, C-13 Magic-Angle-Spinning Nuclear Magnetic Resonance Spectroscopy, Differential Scanning Calorimetry, And X-Ray Diffraction Of Two Polymorphs Of 2,6-Di-Tert-Butylnaphthalene, Peter A. Beckmann, Kendra S. Burbank, Katharine M. Clemo, Erin N. Slonaker, Kristin Averill, Cecil Dybowski, Joshua S. Figueroa, Alicia Glatfelter, Stephanie Koch, Louise M. Liable-Sands, Arnold L. Rheingold

Physics Faculty Research and Scholarship

Polymorphism, the presence of structurally distinct solid phases of the same chemical species, affords a unique opportunity to evaluate the structural consequences of intermolecular forces. The study of two polymorphs of 2,6-di-tert-butylnaphthalene by single-crystal x-ray diffraction, differential scanning calorimetry (DSC), C-13 magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy, and H-1 NMR spin-lattice relaxation provides a picture of the differences in structure and dynamics in these materials. The subtle differences in structure, observed with x-ray diffraction and chemical shifts, strikingly affect the dynamics, as reflected in the relaxation measurements. We analyze the dynamics in terms of both discrete sums and continuous …

The Effects Of Service Learning, Shelley H. Billig

Service Learning, General

Research, while limited, finds that students who help others help themselves academically and socially.

Oslo Summer Workshop On Stochastic Analysis, Salah-Eldin A. Mohammed

Miscellaneous (presentations, translations, interviews, etc)

No abstract provided.

Using A Multiple Intelligence Checklist In Determining Multiple Intelligence, Rebecca Vee Ralston

Theses

Multiple Intelligence Theory was introduced in 1983 by Howard Gardner in his book Frames of Mind. Since the book was introduced. many educators who were searching for new methods to reach their students have utilized the theory of Multiple Intelligences in their classes. To assist in determining students' areas of strength in Multiple Intelligence. The Multiple Intelligence Checklist (MJC) was used in this study. Students, seven hundred seventy-seven, from a suburban elementary school were asked to complete the MIC. Data was collected from students in grades 2 through 5. A factor analysis was completed to determine if the checklist would …

Imsa Kaleidoscope, Stephanie Pace Marshall

Lectures, Speeches, and Talks

I collect kaleidoscopes. At first, I found their artistry magical; however, as I surrendered to the unique song of each kaleidoscope, I became aware that my surrendering was transformative.

Water Current, Volume 32, No. 4, August 2000

Water Current Newsletter

New Method for Detecting Trace Amounts of MTBE and Ethanol at Heart of UNL Contamination Research
From the Director: New Director, New Directions, New Challenges
Lawn and Garden Drought and Climate Tolerance Are Focus of Festival of Color
Summer 2000 Water and Natural Resources Tour
Re-Cap of Water Management Issues Available Free
See You at Husker Harvest Days
NDEQ Water Quality Monitoring
Center-Pivot Map Available

Reaction Of Caffeic Acid With Amino Acids, Yonggang Wang

Masters Theses

The reaction of caffeic acid with tryptophan was studied as a model for the reaction of caffeic acid with amino acids in the aquatic environment. Although the autoxidation reaction of caffeic acid in aqueous solution with subsequent dimerization had been previously studied, it was examined as well for comparison purposes. The present studies demonstrate that oxidized caffeic acid would react with tryptophan. The reaction, like the dimerization reaction, was catalyzed by the presence of iron(III) ions at low pH ( <4) and by hydroxide ions at high pH (10). The reaction of caffeic acid with itself yielded six products, four of which were identified by mass spectroscopy as dimers, with the other two being trimers. The reaction of caffeic acid with tryptophan yielded three product peaks. Two of the product peaks had similar retention times to the dimers from the self-reaction of caffeic acid; the third was a new product resulting from the reaction of caffeic acid with the tryptophan.

A mechanism for the reaction of caffeic acid with tryptophan has been proposed. This mechanism was based on the analysis …

Strain Variation With Sample Thickness In Gan Grown By Hydride Vapor Phase Epitaxy, D. C. Reynolds, David C. Look, B. Jogai, J. E. Hoelscher, R. E. Sherriff, Richard J. Molnar

Physics Faculty Publications

High quality GaN crystals can be grown on sapphire by hydride vapor phase epitaxy. The thermal expansion mismatch between sapphire and GaN produces strain in the GaN crystal as it is cooled from the growth temperature to room temperature. The strain is evidenced by shifts in the photoluminescence and reflectance line positions. By analyzing the surface strain as the crystal thickness is increased, the thickness required to obtain zero surface strain can be estimated. This structure might provide a lattice matched and thermally matched substrate for further epitaxial growth of GaN.

The Relationship Of Small Mammal Species To Habitat Variables In West-Central Georgia And East-Central Alabama, Patricia Maureen Kosky

Theses and Dissertations

The objective of this investigation was to assess the impact of environmental variables upon small mammal species distribution in 60 plots on Fort Benning, Muscogee and Chattahoochee Counties, Georgia and Russell County, Alabama. The small mammal fieldwork was carried out in December of 1994 through January of 1995. The vegetation was inventoried in June through October of 1995. During this period, 235 small mammals were trapped in a total of 5950 trap nights. A total of 10 small mammal species and 234 plant species were identified. The small mammal species abundance's were determined by using snap trapping along the plot …

Reaction Of Tricarbonyl(Dienal)Iron Complexes With B-Allyldiisopinocampheylborane, Vadapalli Prahlad, Abdel-Aziz S. El-Ahl, William A. Donaldson

Chemistry Faculty Research and Publications

Addition of allyldiisopinocampheylborane to racemic (dienal)iron complexes, followed by oxidation, affords diastereomeric (1,4,6-trien-3-ol)iron complexes with moderate to low enantioselectivity. The high enantioselectivity typically observed for this allylborane reagent is attenuated by steric interaction between the Fe(CO)₃ group and the chiral isopinocampheyl groups. Further diminution of the enantioselectivity is observed for dienal complexes in which one rotomer predominates.

Theoretical Prediction Of Nuclear Quadrupole Resonance Spectra Of Aluminum, Bromine And Nitrogen Compounds Via First Principles Calculations, Chris Harwell

LSU Historical Dissertations and Theses

We study the interaction of the electric field gradient (EFG) and the nuclear quadrupole moment of ⁸¹Br,²⁷Al, and ¹⁴N nuclei via ab initio quantum chemistry calculations. The primary goal is to predict the nuclear magnetic resonance (NMR) spectral parameters of interesting materials and assist in interpretation of their spectra. The calculations predict NMR spectral parameters for:

1. ²⁷Al nuclei in andalusite, sillimanite and kyanite - three polymorphs of Al2Si05 - for assigning NMR signals to crystallographic sites, as a zeolite model and studying the effect of structural changes due to temperature (25-1000''C);
2. ¹⁴N nuclei in …

Experimental And Fdtd Study Of The Emi Performance Of An Open-Pin-Field Connector For Modules-On-Backplanes, Xiaoning Ye, Jim Nadolny, James L. Drewniak, Richard E. Dubroff, Thomas Van Doren, Todd H. Hubing

Electrical and Computer Engineering Faculty Research & Creative Works

Experimental measurements and numerical modeling were used to study the EMI performance of a module-on-backplane connector for various configurations of signal-return pin-outs. A commercially available open-pin-field connector was used in these results to connect between the mother-board and the daughter-card. The experimental techniques, based on measuring |S₂₁|, included both common-mode current measurements and monopole near-field probe measurements. The FDTD method was used to provide numerical support of the near-field measurements and generally agreed with the measured results for frequencies up to 3 GHz. The FDTD method was also used to investigate the relationship between the radiated EMI at …

Masses For Galactic Beat Cepheids, Noella L. D'Cruz, Siobahn M. Morgan, Erika Böhm-Vitense

Faculty Publications

Accurate mass determinations for Cepheids may be used to determine the degree of excess mixing in the interiors of their main-sequence progenitors : the larger the excess mixing, the larger the luminosity of the Cepheid of a given mass, or the smaller the mass of a Cepheid with given luminosity. Dynamical masses determined recently for a few Cepheid binaries indicate excess mixing somewhat stronger than that corresponding to the convective overshoot models by Schaller et al. Beat Cepheids can be used similarly to test main-sequence mixing in stellar interiors. The period ratios for beat Cepheids depend on luminosity, heavy element …

On The Effectiveness Of Probabilistic Packet Marking For Ip Traceback Under Denial Of Service Attack, Kihong Park, Heejo Lee

Department of Computer Science Technical Reports

No abstract provided.

Computer-Aided Synthesis Of Higher Pairs Via Configuration Space Manupulation, Min-Ho Kyung, Elisha Sacks

Department of Computer Science Technical Reports

No abstract provided.

Rosat Hri And Asca Observations Of The Spiral Galaxy Ngc 6946 And Its Northeast Complex Of Luminous Supernova Remnants, Eric M. Schlegel, William P. Blair, Robert A. Fesen

Dartmouth Scholarship

Analysis of 80 ks ASCA and 60 ks ROSAT HRI observations of the face-on spiral galaxy NGC 6946 are presented. The ASCA image is the first observation of this galaxy above ~2 keV. Diffuse emission may be present in the inner ~4' extending to energies above ~2–3 keV. In the HRI data, 14 pointlike sources are detected, the brightest two being a source very close to the nucleus and a source to the northeast that corresponds to a luminous complex of interacting supernova remnants (SNRs). We detect a point source that lies ~30'' west of the SNR complex but with …

News From Hope College, Volume 32.1: August, 2000, Hope College

News from Hope College

No abstract provided.

The Role Of Public Policy In Skills Development Of Black Workers In The 21st Century, Timothy J. Bartik, Kevin Hollenbeck

Upjohn Institute Working Papers

This paper discusses the role of public policy in the skills development system of the U.S. It further examines the implications of that policy for the skill development and career progression of black workers. The paper describes the current "system" for skills development in the United States as a two- tiered system: The "first-chance" or conventional system allows individuals to proceed through an extensive public elementary, secondary, and postsecondary educational sector that is supplemented by private educational institutions and is followed by employer-provided job training and work experience. The "second-chance" system is designed for individuals who do not successfully traverse …

Computational Geometry Column 39, Joseph O'Rourke

Computer Science: Faculty Publications

The resolution of a decades-old open problem is described: polygonal chains cannot lock in the plane.

The Law Of Armed Conflict As Soft Power: Optimizing Strategic Choice, Michael N. Schmitt

International Law Studies

No abstract provided.

Cyclodextrin Inclusion Complexes Of Betamethasone-Related Steroids Studied Using Hplc, Keith Gerald Flood

Seton Hall University Dissertations and Theses (ETDs)

.

Effect Of Disorder On Perpendicular Magnetotransport In Co/Cu Multilayers, Evgeny Y. Tsymbal

Evgeny Tsymbal Publications

We investigate the spin-dependent conductance of the Co/Cu multilayers in the current-perpendicular-tothe- plane (CPP) geometry. Using a realistic tight-binding model for the electronic band structure of the multilayer, and introducing disorder in the on-site atomic energies we calculate the conductance and giant magnetoresistance (GMR) within the quantum-mechanical linear response theory by performing averaging over random disorder configurations. By varying the thickness and the number of individual layers and the degree of disorder in the multilayers, we analyze factors influencing the CPP GMR. In particular, we show the importance of the thickness-dependent interface resistance, which depends on the mean free path …

Theory Of Magnetostatic Coupling In Thin-Film Rectangular Magnetic Elements, Evgeny Y. Tsymbal

Evgeny Tsymbal Publications

A theory of magnetostatic coupling in thin-film uniformly magnetized arrays of rectangular magnetic elements is presented. Analytic expressions for the magnetostatic energy and the dipolar fields are derived. The influence of the aspect ratio and the spacing between the elements on the magnetostatic coupling is investigated. It is found that increasing the aspect ratio reduces the critical distance between the elements, above which the magnetostatic inter-element coupling can be neglected.

Hidden Mechanisms Generate Negative Feedbacks In A Stochastic Model: A Comment On Murray, Andrew J. Tyre, Brigitte Tenhumberg

School of Biological Sciences: Faculty Publications

The debate between density-dependent and densityindependent population regulation is one of the oldest and most vociferous in ecology. Australian ecologists participated from the beginning (Nicholson 1933; Andrewartha & Birch 1954). Despite recent efforts to put the debate to rest (Turchin 1995, 1999), there appears little likelihood of either side abandoning the ramparts (Bonsall et al. 1998). Murray (2000; this issue) uses a stochastic simulation model to argue that a significant statistical relationship between birth rate and population size (i.e. density dependence) can arise in the absence of negative feedbacks of population size on fecundity. In this comment we demonstrate that …

Limits On Anomalous Ww Γ And Wwz Couplings From Ww/Wz→Eνjj Production, B. Abbott, Gregory Snow, D0 Collaboration

Gregory Snow Publications

Limits on anomalous WW γ and WWZ couplings are presented from a study of WW/WZ→eνjj events produced in pp̅ collisions at √s = 1.8 TeV. Results from the analysis of data collected using the DØ detector during the 1993–1995 Tevatron collider run at Fermilab are combined with those of an earlier study from the 1992–1993 run. A fit to the transverse momentum spectrum of the W boson yields direct limits on anomalous WW γ and WWZ couplings. With the assumption that the WW γ and WWZ couplings are equal, we obtain -0.34 < λ < 0.36 (with Δk=0) and -0.43< Δk<0.59 (with λ =0) at the 95% confidence level for a form-factor scale Λ = 2.0 TeV.