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Texas Timber Price Trends, Volume 28, Number 2, March/April 2010
Bi-monthly report on average prices paid for standing timber in Texas, calculated based on reported timber sales.
Date:
March 2010
Creator:
Texas Forest Service
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Travel Log, March 2010
Newsletter dedicated to traveling in Texas, including information about news, locations, and events of interest to visitors as well as statistics and summaries of travel in the state.
Date:
March 2010
Creator:
Texas. Travel and Information Division.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas WIC News, Volume 19, Number 2, March/April 2010
Bimonthly newsletter of the Texas Department of State Health Services about topics related to the Women, Infants and Children (WIC) program. WIC is a nutritional program that provides education and councelling, nutritious foods, and help accessing health care to low-income women, infants, and children.
Date:
March 2010
Creator:
Texas. Bureau of WIC Nutrition.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Thermal Degradation Studies of Polyurethane/POSS Nanohybrid Elastomers
Reported here is the synthesis of a series of Polyurethane/POSS nanohybrid elastomers, the characterization of their thermal stability and degradation behavior at elevated temperatures using a combination of Thermal Gravimetric Analysis (TGA) and Thermal Volatilization Analysis (TVA). A series of PU elastomers systems have been formulated incorporating varying levels of 1,2-propanediol-heptaisobutyl-POSS (PHIPOSS) as a chain extender unit, replacing butane diol. The bulk thermal stability of the nanohybrid systems has been characterized using TGA. Results indicate that covalent incorporation of POSS into the PU elastomer network increase the non-oxidative thermal stability of the systems. TVA analysis of the thermal degradation of the POSS/PU hybrid elastomers have demonstrated that the hybrid systems are indeed more thermally stable when compared to the unmodified PU matrix; evolving significantly reduced levels of volatile degradation products and exhibiting a {approx}30 C increase in onset degradation temperature. Furthermore, characterization of the distribution of degradation products from both unmodified and hybrid systems indicate that the inclusion of POSS in the PU network is directly influencing the degradation pathways of both the soft and hard block components of the elastomers: The POSS/PU hybrid systems show reduced levels of CO, CO2, water and increased levels of THF as products of …
Date:
March 5, 2010
Creator:
Lewicki, J P; Pielichowski, K; TremblotDeLaCroix, P; Janowski, B; Todd, D & Liggat, J J
Object Type:
Article
System:
The UNT Digital Library
Thermal Performance of Radioactive Material Packages in Transport Configuration
Drum type packages are routinely used to transport radioactive material (RAM) in the U.S. Department of Energy (DOE) complex. These packages are designed to meet the federal regulations described in 10 CFR Part 71. The packages are transported in specially designed vehicles like Safe Secure Transport (SST) for safety and security. In the transport vehicles, the packages are placed close to each other to maximize the number of units in the vehicle. Since the RAM contents in the packagings produce decay heat, it is important that they are spaced sufficiently apart to prevent overheating of the containment vessel (CV) seals and the impact limiter to ensure the structural integrity of the package. This paper presents a simple methodology to assess thermal performance of a typical 9975 packaging in a transport configuration.
Date:
March 4, 2010
Creator:
Gupta, N.
Object Type:
Article
System:
The UNT Digital Library
Thermodynamic States in Explosion Fields
We investigate the thermodynamic states occurring in explosion fields from condensed explosive charges. These states are often modeled with a Jones-Wilkins-Lee (JWL) function. However, the JWL function is not a Fundamental Equation of Thermodynamics, and therefore cannot give a complete specification of such states. We use the Cheetah code of Fried to study the loci of states of the expanded detonation products gases from C-4 charges, and their combustion products air. In the Le Chatelier Plane of specific-internal-energy versus temperature, these loci are fit with a Quadratic Model function u(T), which has been shown to be valid for T < 3,000 K and p < 1k-bar. This model is used to derive a Fundamental Equation u(v,s) for C-4. Given u(v,s), one can use Maxwell's Relations to derive all other thermodynamic functions, such as temperature: T(v,s), pressure: p(v,s), enthalpy: h(v,s), Gibbs free energy: g(v,s) and Helmholz free energy: f(v,s); these loci are displayed in figures for C-4. Such complete equations of state are needed for numerical simulations of blast waves from explosive charges, and their reflections from surfaces.
Date:
March 12, 2010
Creator:
Kuhl, A L
Object Type:
Article
System:
The UNT Digital Library
Thermoluminescent Dosimeter Use for Environmental Surveillance at the Hanford Site, 1971–2005
This report describes the use of thermo luminescent dosimeters for environmental surveillance of external radiation on and around the Hanford Site for the period of 1970 to 2005. It addresses changes in the technology and associated quality control and assurance used in this work and summarizes the results of the 35 year period of external radiation surveillance. The appendices to this report provide trend plots for each location that comprised the shoreline, onsite, perimeter, and offsite sample design.
Date:
March 1, 2010
Creator:
Antonio, Ernest J.; Poston, Ted M. & Rathbone, Bruce A.
Object Type:
Report
System:
The UNT Digital Library
Thin Silicon MEMS Contact-Stress Sensor
This thin, MEMS contact-stress (CS) sensor continuously and accurately measures time-varying, solid interface loads in embedded systems over tens of thousands of load cycles. Unlike all other interface load sensors, the CS sensor is extremely thin (< 150 {micro}m), provides accurate, high-speed measurements, and exhibits good stability over time with no loss of calibration with load cycling. The silicon CS sensor, 5 mm{sup 2} and 65 {micro}m thick, has piezoresistive traces doped within a load-sensitive diaphragm. The novel package utilizes several layers of flexible polyimide to mechanically and electrically isolate the sensor from the environment, transmit normal applied loads to the diaphragm, and maintain uniform thickness. The CS sensors have a highly linear output in the load range tested (0-2.4 MPa) with an average accuracy of {+-} 1.5%.
Date:
March 22, 2010
Creator:
Kotovsky, J; Tooker, A & Horsley, D
Object Type:
Article
System:
The UNT Digital Library
Three-Dimensional Magnetohydrodynamic Simulation of Slapper Initiation Systems
Although useful information can be gleaned from 2D and even 1D simulations of slapper type initiation systems, these systems are inherently three-dimensional and therefore require full 3D representation to model all relevant details. Further, such representation provides additional insight into optimizing the design of such devices from a first-principles perspective and can thereby reduce experimental costs. We discuss in this paper several ongoing efforts in modeling these systems, our pursuit of validation, and extension of these methods to other systems. Our results show the substantial dependence upon highly accurate global equations of state and resistivity models in these analyses.
Date:
March 9, 2010
Creator:
Christensen, J S & Hrousis, C A
Object Type:
Article
System:
The UNT Digital Library
[Three Windows in Courthouse]
Photograph of three windows inside the Gonzales County courthouse in Gonzales, Texas.
Date:
March 10, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
[Tiled Floor in Courthouse]
Photograph of a tiled floor in the Caldwell County courthouse in Lockhart, Texas. A wooden door is visible in the background.
Date:
March 10, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
[Tiled Floor in Hallway]
Photograph of a tiled floor in a hallway in the Comal County courthouse in New Braunfels, Texas. An office is visible through an open door in the background.
Date:
March 10, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
[Top of a Staircase]
Photograph of a landing at the top of a wooden staircase in the Bastrop County courthouse in Bastrop, Texas. A table and a door are also visible.
Date:
March 9, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
[Top of Column]
Photograph of the top of a column on the ceiling in the Lee County courthouse in Giddings, Texas. Two lamps and windows are visible to the right.
Date:
March 9, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
Topological Field Theory of Time-Reversal Invariant Insulators
We show that the fundamental time reversal invariant (TRI) insulator exists in 4 + 1 dimensions, where the effective field theory is described by the 4 + 1 dimensional Chern-Simons theory and the topological properties of the electronic structure is classified by the second Chern number. These topological properties are the natural generalizations of the time reversal breaking (TRB) quantum Hall insulator in 2 + 1 dimensions. The TRI quantum spin Hall insulator in 2 + 1 dimensions and the topological insulator in 3 + 1 dimension can be obtained as descendants from the fundamental TRI insulator in 4 + 1 dimensions through a dimensional reduction procedure. The effective topological field theory, and the Z{sub 2} topological classification for the TRI insulators in 2+1 and 3+1 dimensions are naturally obtained from this procedure. All physically measurable topological response functions of the TRI insulators are completely described by the effective topological field theory. Our effective topological field theory predicts a number of novel and measurable phenomena, the most striking of which is the topological magneto-electric effect, where an electric field generates a magnetic field in the same direction, with an universal constant of proportionality quantized in odd multiples of the fine …
Date:
March 19, 2010
Creator:
Qi, Xiao-Liang; Hughes, Taylor & Zhang, Shou-Cheng
Object Type:
Article
System:
The UNT Digital Library
Topological Insulators at Room Temperature
Topological insulators are new states of quantum matter with surface states protected by the time-reversal symmetry. In this work, we perform first-principle electronic structure calculations for Sb{sub 2}Te{sub 3}, Sb{sub 2}Se{sub 3}, Bi{sub 2}Te{sub 3} and Bi{sub 2}Se{sub 3} crystals. Our calculations predict that Sb{sub 2}Te{sub 3}, Bi{sub 2}T e{sub 3} and Bi{sub 2}Se{sub 3} are topological insulators, while Sb{sub 2}Se{sub 3} is not. In particular, Bi{sub 2}Se{sub 3} has a topologically non-trivial energy gap of 0.3eV , suitable for room temperature applications. We present a simple and unified continuum model which captures the salient topological features of this class of materials. These topological insulators have robust surface states consisting of a single Dirac cone at the {Lambda} point.
Date:
March 25, 2010
Creator:
Zhang, Haijun; Liu, Chao-Xing; Qi, Xiao-Liang; Dai, Xi; Fang, Zhong & Zhang, Shou-Cheng
Object Type:
Report
System:
The UNT Digital Library
Topological Superconductivity and Superfluidity
None
Date:
March 25, 2010
Creator:
Qi, Xiao-Liang
Object Type:
Report
System:
The UNT Digital Library
[Tops of Columns]
Photograph of the tops of two columns on the exterior of the Caldwell County courthouse in Lockhart, Texas.
Date:
March 10, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
Towards an Error Model for OpenMP
OpenMP lacks essential features for developing mission-critical software. In particular, it has no support for detecting and handling errors or even a concept of them. In this paper, the OpenMP Error Model Subcommittee reports on solutions under consideration for this major omission. We identify issues with the current OpenMP specification and propose a path to extend OpenMP with error-handling capabilities. We add a construct that cleanly shuts down parallel regions as a first step. We then discuss two orthogonal proposals that extend OpenMP with features to handle system-level and user-defined errors.
Date:
March 22, 2010
Creator:
Wong, M.; Klemm, M.; Duran, A.; Mattson, T.; Haab, G.; de Supinski, B. R. et al.
Object Type:
Article
System:
The UNT Digital Library
Towards the understanding of PETN initiation by a fast, high power arc source
We present a thorough characterization of a capacitor driven arc source that can deliver up to 200 mJ of energy to the arc and high explosive in a well-controlled, repeatable manner on the hundreds of nanoseconds time-scale. Our ultimate purpose is to create a platform to study high explosive kinetics under extreme conditions of high-temperature. In the current paper, we characterize the behavior of our arc source by electrical discharge over a thin PETN film. Temperature and density are determined by time-resolved atomic emission spectroscopy on the nano- to microsecond time scale along with fast photographic imaging to capture time-resolved images of the expanding plasma. We also discuss preliminary simulations of arc plasma using a 1-D hydrodynamic model. Comparisons of these simulations with experimental data are presented. Ultimately our goal is to create a platform that will generate conditions of high temperature in order to study high explosive kinetics. We believe that our arc source platform can be further combined with a time-resolved vibrational spectroscopy (e.g. IR or Raman) to study chemical kinetics under extreme conditions. High temperature conditions may access novel reactive pathways that are different from either shock or slower thermal processes that are substantially lower in temperature.
Date:
March 5, 2010
Creator:
Grant, C D; Tang, V; Glascoe, E A & McCarrick, J F
Object Type:
Article
System:
The UNT Digital Library
Tracking tropical cloud systems - Observations for the diagnosis of simulations by the Weather Research and Forecasting (WRF) Model
To aid in improving model parameterizations of clouds and convection, we examine the capability of models, using explicit convection, to simulate the life cycle of tropical cloud systems in the vicinity of the ARM Tropical Western Pacific sites. The cloud life cycle is determined using a satellite cloud tracking algorithm (Boer and Ramanathan, 1997), and the statistics are compared to those of simulations using the Weather Research and Forecasting (WRF) Model. Using New York Blue, a Blue Gene/L supercomputer that is co-operated by Brookhaven and Stony Brook, simulations are run at a resolution comparable to the observations. Initial results suggest a computational paradox where, even though the size of the simulated systems are about half of that observed, their longevities are still similar. The explanation for this seeming incongruity will be explored.
Date:
March 15, 2010
Creator:
Vogelmann, A.M.; Lin, W.; Cialella, A.; Luke, E.; Jensen, M. & Zhang, M.
Object Type:
Article
System:
The UNT Digital Library
Trade Agreements: Impact on the U.S. Economy
This report examines the major features of economic models being used to estimate the effects of trade agreements. It assesses the strengths and weaknesses of the models as an aid in helping Congress evaluate the economic impact of trade agreements on the U.S. economy.
Date:
March 11, 2010
Creator:
Jackson, James K.
Object Type:
Report
System:
The UNT Digital Library
Traditional narrative about a lazy husband
This is a folktale about the lazy husband. Dialect: Standard Boro
Date:
March 2, 2010
Creator:
Basumatary, Prafulla
Object Type:
Sound
System:
The UNT Digital Library
Traditional narrative about seasons
This is a folk tale about seasons. Dialect: Standard Boro
Date:
March 1, 2010
Creator:
Basumatary, Prafulla
Object Type:
Sound
System:
The UNT Digital Library