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The Baytown Sun (Baytown, Tex.), Vol. 85, No. 11, Ed. 1 Tuesday, December 20, 2005
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 20, 2005
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Bell-Plesset effects for an accelerating interface with contiguous density gradients
A Plesset-type treatment [J. Appl. Phys. 25, 96 (1954)] is used to assess the effects of contiguous density gradients at an accelerating spherical classical interface on Rayleigh-Taylor and Bell-Plesset perturbation growth. Analytic expressions are obtained that describe enhanced Rayleigh-Taylor instability growth from contiguous density gradients aligned with the acceleration and which increase the effective Atwood number of the perturbed interface. A new pathway for geometric amplification of surface perturbations on an accelerating interface with contiguous density gradients is identified. A resonance condition between the density-gradient scalelength and the radius of the interface is also predicted based on a linearized analysis of Bernoulli's equation, potentially leading to enhanced perturbation growth. Comparison of the analytic treatment with detailed two-dimensional single-mode growth-factor simulations shows good agreement for low-mode numbers where the effects of spherical geometry are most manifested.
Date:
December 20, 2005
Creator:
Amendt, P
Object Type:
Article
System:
The UNT Digital Library
Boerne Star & Recorder (Boerne, Tex.), Vol. 99, No. 94, Ed. 1 Tuesday, December 20, 2005
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
December 20, 2005
Creator:
Cartwright, Brian
Object Type:
Newspaper
System:
The Portal to Texas History
Brady Standard-Herald and Heart O' Texas News (Brady, Tex.), Ed. 1 Tuesday, December 20, 2005
Semiweekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
December 20, 2005
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History
Caribbean Region: Issues in U.S. Relations
This report deals with broader issues in U.S. relations with the Caribbean and does not include an extensive discussion of Haiti and Cuba. U.S. policy toward these Caribbean nations is covered in two CRS products: CRS Report RL32294, Haiti: Developments and U.S. Policy Since 1991 and Current Congressional Concerns, and CRS Report RL32730, Cuba: Issues for the 109th Congress.
Date:
December 20, 2005
Creator:
Sullivan, Mark P.
Object Type:
Report
System:
The UNT Digital Library
Characterization of sub-nuclear changes in Caenorhabditis elegans embryos exposed to brief, intermediate and long-term anoxia to analyze anoxia-induced cell cycle arrest
Article discussing research on the characterization of sub-nuclear changes in Caenorhabditis elegans embryos exposed to brief, intermediate and long-term anoxia to analyze anoxia-induced cell cycle arrest.
Date:
December 20, 2005
Creator:
Hajeri, Vinita A.; Trejo, Jesus & Padilla, Pamela A.
Object Type:
Article
System:
The UNT Digital Library
Cobalt Nanocrystals as Starting Materials for Shape Modificationand Assembly Formation
Surfactant-coated cobalt nanocrystals can be prepared with areasonable degree of control over particle size and shape using athermolytic route. The small crystallite size, enhanced reactivity andtunable interparticle interactions enable use of this material asstarting material for demonstration of achievement of novel structuresusing extremely simple solution-based approaches. In particular,formation of hollow cobalt sulfide nanocrystals upon chemicalmodification and emergence of long-range orientational order upondrying-mediated assembly of cobalt nanocrystals is reportedhere.Colloidal preparation of Co nanocrystals has been well-studied.Here, we emphasize general principles and crystallographic/morphologicalcharacterization of disk-shaped hcp-Co nanocrystals. Use of surfactantmolecules enables achievement of multiple morphologies in one syntheticsystem.Formation of hollow structures upon in-solution sulfidation of Conanocrystals is presented and discussed. A Kirkendall-type effect,involving dominant outward mass transport during formation of the ionicshell material explains the results naturally. It is expected that thisphenomenon will generalize extensively to formation of hollow structuresof an enormous variety of compositions. Detailed study of particlemorphology as a function of reaction conditions suggest phenomena likelyto be generally relevant to use of this approach. A short report ofcrystallographic co-alignment into vortex-like structures is alsoprovided. Our current best picture of this process involves an interplayof packing and magnetic interactions between facetedparticles.
Date:
December 20, 2005
Creator:
Erdonmez, Can Kerem
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
DIFFERENTIAL GROUP-VELOCITY DETECTION OF FLUID PATHS
For nearly 50 years, surface waves that propagate through near-surface soils have been utilized in engineering for the determination of the small-strain dynamic properties of soils. These techniques, although useful, have not been sufficiently precise to use in detecting the subtle changes in soil properties that accompany short-term changes in fluid content. The differential techniques developed in this research now make it possible to monitor small changes (less than 3 cm) in the water level of shallow soil aquifers. Using inversion techniques and tomography, differential seismic techniques could track the water level distribution in aquifers with water being pumped in or out. Differential surface wave analysis could lead to new ways to monitor reservoir levels and verify hydrologic models. Field data obtained during this investigation have measured changes in surface-wave phase and group velocity before and after major rain events, and have detected subtle changes associated with pumping water into an aquifer and pumping water out of an aquifer. This research has established analysis techniques for observing these changes. These techniques combine time domain measurements to isolate surface wave arrivals with frequency domain techniques to determine the effects as a function of frequency. Understanding the differences in response as a …
Date:
December 20, 2005
Creator:
Long, Leland Timothy
Object Type:
Report
System:
The UNT Digital Library
DIFFERENTIAL GROUP-VELOCITY DETECTION OF FLUID PATHS
For nearly 50 years, surface waves that propagate through near-surface soils have been utilized in engineering for the determination of the small-strain dynamic properties of soils. These techniques, although useful, have not been sufficiently precise to use in detecting the subtle changes in soil properties that accompany short-term changes in fluid content. The differential techniques developed in this research now make it possible to monitor small changes (less than 3 cm) in the water level of shallow soil aquifers. Using inversion techniques and tomography, differential seismic techniques could track the water level distribution in aquifers with water being pumped in or out. Differential surface wave analysis could lead to new ways to monitor reservoir levels and verify hydrologic models. Field data obtained during this investigation have measured changes in surface-wave phase and group velocity before and after major rain events, and have detected subtle changes associated with pumping water into an aquifer and pumping water out of an aquifer. This research has established analysis techniques for observing these changes. These techniques combine time domain measurements to isolate surface wave arrivals with frequency domain techniques to determine the effects as a function of frequency. Understanding the differences in response as a …
Date:
December 20, 2005
Creator:
Long, Leland Timothy
Object Type:
Report
System:
The UNT Digital Library
Direct-Semidirect Thermal Neutron Capture Calculations
A method for computing direct-semidirect (DSD) neutron radiative capture is presented and applied to thermal neutron capture on {sup 19}F, {sup 27}Al, {sup 28,29.30}Si, {sup 35,37}Cl, {sup 39,41}K, {sup 56}Fe, and {sup 238}U, in support of data evaluation effort at the O.R.N.L. The DSD method includes both direct and semidirect capture; the latter is a core-polarization term in which the giant dipole resonance is formed. We study the effects of a commonly used ''density'' approximation to the EM operator and find it to be unsatisfactory for the nuclei considered here. We also study the magnitude of semidirect capture relative to the pure direct capture. Furthermore, we compare our results with those obtained from another direct capture code (Tedca [17]). We also compare our results with those obtained from analytical expression for external capture derived by Lane and Lynn [3], and its extension to include internal capture [7]. To estimate the effect of nuclear deformation on direct capture, we computed direct thermal capture on {sup 238}U with and without imposition of spherical symmetry. Direct capture for a spherically symmetric {sup 238}U was approximately 6 mb, while a quadrupole deformation of 0.215 on the shape of {sup 238}U lowers this cross section …
Date:
December 20, 2005
Creator:
Arbanas, G.; Dietrich, F. S. & Kerman, A. K.
Object Type:
Article
System:
The UNT Digital Library
Dynamical Study of Guest-Host Orientational Interaction in LiquidCrystalline Materials
Guest-host interaction has long been a subject of interest in many disciplines. Emphasis is often on how a small amount of guest substance could significantly affect the properties of a host material. This thesis describe our work in studying a guest-host effect where dye-doping of liquid crystalline materials greatly enhances the optical Kerr nonlinearity of the material. The dye molecules, upon excitation and via intermolecular interaction, provides an extra torque to reorient the host molecules, leading to the enhanced optical Kerr nonlinearity. We carried out a comprehensive study on the dynamics of the photoexcited dye-doped liquid crystalline medium. Using various experimental techniques, we separately characterized the dynamical responses of the relevant molecular species present in the medium following photo-excitation, and thus were able to follow the transient process in which photo-excitation of the dye molecules exert through guest-host interaction a net torque on the host LC material, leading to the observed enhanced molecular reorientation. We also observed for the first time the enhanced reorientation in a pure liquid crystal system, where the guest population is created through photoexcitation of the host molecules themselves. Experimental results agree quantitatively with the time-dependent theory based on a mean-field model of the guest-host interaction.
Date:
December 20, 2005
Creator:
Truong, Thai Viet
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The EGS5 Code System
In the nineteen years since EGS4 was released, it has been used in a wide variety of applications, particularly in medical physics, radiation measurement studies, and industrial development. Every new user and every new application bring new challenges for Monte Carlo code designers, and code refinements and bug fixes eventually result in a code that becomes difficult to maintain. Several of the code modifications represented significant advances in electron and photon transport physics, and required a more substantial invocation than code patching. Moreover, the arcane MORTRAN3[48] computer language of EGS4, was highest on the complaint list of the users of EGS4. The size of the EGS4 user base is difficult to measure, as there never existed a formal user registration process. However, some idea of the numbers may be gleaned from the number of EGS4 manuals that were produced and distributed at SLAC: almost three thousand. Consequently, the EGS5 project was undertaken. It was decided to employ the FORTRAN 77 compiler, yet include as much as possible, the structural beauty and power of MORTRAN3. This report consists of four chapters and several appendices. Chapter 1 is an introduction to EGS5 and to this report in general. We suggest that you …
Date:
December 20, 2005
Creator:
Hirayama, Hideo; Namito, Yoshihito; Bielajew, Alex F.; Wilderman, Scott J. & Nelson, Walter R.
Object Type:
Report
System:
The UNT Digital Library
Environmental Survey Report for the ETTP: Environmental Management Waste Management Facility (EMWMF) Haul Road Corridor, Oak Ridge, Tennessee
This report summarizes the results of environmental surveys conducted within the corridor of a temporary haul road (''Haul Road'') to be constructed from East Tennessee Technology Park (ETTP) to the Environmental Management Waste Management Facility (EMWMF) located just west of the Y-12 National Security Complex (Y-12). Environmental surveys were conducted by natural resource experts at Oak Ridge National Laboratory who routinely assess the significance of various project activities on the Oak Ridge Reservation (ORR). ORNL assistance to the Haul Road Project included environmental assessments necessary to determine the best route for minimizing impacts to sensitive resources such as wetlands or rare plants. Once the final route was chosen, environmental surveys were conducted within the corridor to evaluate the impacts to sensitive resources that could not be avoided. The final Haul Road route follows established roads and a power-line corridor to the extent possible (Fig. 1). Detailed explanation regarding the purpose of the Haul Road and the regulatory context associated with its construction is provided in at least two major documents and consequently is not presented here: (1) Explanation of Significant Differences for the Record of Decision for the Disposal of Oak Ridge Reservation Comprehensive Environmental Response, Compensation, and Liability Act …
Date:
December 20, 2005
Creator:
Peterson, M. J.
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Tuesday, December 20, 2005
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 20, 2005
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Government-Sponsored Enterprises (GSEs): An Institutional Overview
None
Date:
December 20, 2005
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 36, No. 541, Ed. 1 Tuesday, December 20, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
December 20, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 36, No. 542, Ed. 1 Tuesday, December 20, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
December 20, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Habeas Review in Death Penalty Cases: Selected Opinions of Judge Samuel Alito
This report provides an overview of selected opinions (majority and dissenting) by Judge Alito addressing habeas review in death penalty cases.
Date:
December 20, 2005
Creator:
Smith, Alison M.
Object Type:
Report
System:
The UNT Digital Library
Internet: An Overview of Key Technology Policy Issues Affecting Its Use and Growth
None
Date:
December 20, 2005
Creator:
Smith, Marcia S.; Moteff, John D.; Kruger, Lennard G.; Gilroy, Angele A.; Seifert, Jeffrey W.; Figliola, Patricia Moloney et al.
Object Type:
Report
System:
The UNT Digital Library
[Jose Legaspi standing behind podium with computer monitor]
José Legaspi is president of The Legaspi Company, an Hispanic retail consulting firm and a partner in Hispanic Retail Group.
Date:
December 20, 2005
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Jose Legaspi standing behind podium with "Fort Worth" sign]
José Legaspi is president of The Legaspi Company, an Hispanic retail consulting firm and a partner in Hispanic Retail Group.
Date:
December 20, 2005
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Jose Legaspi with hands on podium]
José Legaspi is president of The Legaspi Company, an Hispanic retail consulting firm and a partner in Hispanic Retail Group.
Date:
December 20, 2005
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
Lone Star Ride Fighting Aids 2005 Final Return Totals
Photograph of four representatives smiling at the camera and standing behind a large printed check in the amount of $280,890.00 dated December 20, 2005. The paper that the photo is printed on reads, "LONE STAR RIDE FIGHTING AIDS 2005, FINAL RETURN TOTALS, $280,890.00", "Hurricane Rita may have forced the cancellation of the scheduled two-day event on September 24 and 25, but it did not cancel the enthusiasm of Lone Star Ride participants who participated in a one day ride on November 5." Left to right the individuals are Don Maison, president and CEO of AIDS Services of Dallas, Janie Bush, LSR Event Manager, Dara Austin, Executive Director AIDS Outreach Center of Tarrant County; Paul Scott, Executive Director Resource Center of Dallas.
Date:
December 20, 2005
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
The Longhorn Express (Harper, Tex.), Vol. 8, No. 3, Ed. 1 Tuesday, December 20, 2005
Student newspaper of Harper Independent School District in Harper, Texas that includes school news and information along with advertising.
Date:
December 20, 2005
Creator:
Harper Independent School District Journalism Class
Object Type:
Newspaper
System:
The Portal to Texas History