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1,352 Matching Results
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0.351 micron Laser Beam propagation in High-temperature Plasmas
A study of the laser-plasma interaction processes have been performed in plasmas that are created to emulate the plasma conditions in indirect drive inertial confinement fusion targets. The plasma emulator is produced in a gas-filled hohlraum; a blue 351-nm laser beam propagates along the axis of the hohlraum interacting with a high-temperature (T{sub e} = 3.5 keV), dense (n{sub e} = 5 x 10{sup 20}cm{sup -3}), long-scale length (L {approx} 2 mm) plasma. Experiments at these conditions have demonstrated that the interaction beam produces less than 1% total backscatter resulting in transmission greater than 90% for laser intensities less than I < 2 x 10{sup 15} W-cm{sup -2}. The bulk plasma conditions have been independently characterized using Thomson scattering where the peak electron temperatures are shown to scale with the hohlraum heater beam energy in the range from 2 keV to 3.5 keV. This feature has allowed us to determine the thresholds for both backscattering and filamentation instabilities; the former measured with absolutely calibrated full aperture backscatter and near backscatter diagnostics and the latter with a transmitted beam diagnostics. A plasma length scaling is also investigated extending our measurements to 4-mm long high-temperature plasmas. At intensities I < 5 x …
Date:
December 10, 2007
Creator:
Froula, D.; Divol, L.; Meezan, N.; Ross, J.; Berger, R. L.; Michel, P. et al.
Object Type:
Report
System:
The UNT Digital Library
900-24 Mock Tensile Tests
None
Date:
December 10, 2007
Creator:
Cunningham, B J & Gagliardi, F J
Object Type:
Report
System:
The UNT Digital Library
14C/C measurements support Andreev's internode method to determine lichen growth rates in Cladina stygia (Fr.) Ahti
Growth rates and the ability to date an organism can greatly contribute to understanding its population biology and community dynamics. 1n 1954, Andreev proposed a method to date Cladina, a fruticose lichen, using total thallus length and number of internodes. No research, however, has demonstrated the reliability of this technique or compared its estimates to those derived by other means. In this study, we demonstrate the utility of {sup 14}C/C ratios to determine lichen age and growth rate in Cladina stygia (Fr.) Ahti collected from northwestern Alaska, USA. The average growth rate using {sup 14}C/C ratios was 6.5 mm {center_dot} yr{sup -1}, which was not significantly different from growth rates derived by Andreev's internode method (average = 6.2 mm {center_dot} yr{sup -1}); thus, suggesting the reliability of Andreev's simple field method for dating lichens. In addition, we found lichen growth rates appeared to differ with geographic location, yet did not seem related to ambient temperature and total precipitation.
Date:
December 5, 2007
Creator:
Holt, E. & Bench, G.
Object Type:
Article
System:
The UNT Digital Library
[15th Annual Christmas/Kwanzaa Concert, Part 1 of 2]
Video recording from The Black Academy of Arts and Letters recorded during their 15th Annual Christmas/Kwanzaa Concert event in 2007. This video features various choral and band performances to celebrate the holidays live on the Naomi Bruton Main Stage. This video is Part 1 of 2 of the concert.
Date:
December 15, 2007
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
[15th Annual Christmas/Kwanzaa Concert, Part 2 of 2]
Video recording from The Black Academy of Arts and Letters recorded during their 15th Annual Christmas/Kwanzaa Concert event in 2007. This video features various choral and band performances to celebrate the holidays live on the Naomi Bruton Main Stage. This video is Part 2 of 2 of the concert.
Date:
December 15, 2007
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 37, No. 12, Ed. 1 Friday, December 7, 2007
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 7, 2007
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. [37], No. [13], Ed. 1 Friday, December 14, 2007
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 14, 2007
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
2006 Toxic Chemical Release Inventory Report for the Emergency Planning and Community Right-to-Know Act of 1986, Title III, Section 313
For reporting year 2006, Los Alamos National Laboratory (LANL or the Laboratory) submitted Form R reports for lead as required under the Emergency Planning and Community Right-to-Know Act (EPCRA) Section 313. No other EPCRA Section 313 chemicals were used in 2006 above the reportable thresholds. This document was prepared to provide a description of the evaluation of EPCRA Section 313 chemical use and threshold determinations for LANL for calendar year 2006, as well as to provide background information about data included on the Form R reports. Section 313 of EPCRA specifically requires facilities to submit a Toxic Chemical Release Inventory Report (Form R) to the U.S. Environmental Protection Agency (EPA) and state agencies if the owners and operators manufacture, process, or otherwise use any of the listed toxic chemicals above listed threshold quantities. EPA compiles this data in the Toxic Release Inventory database. Form R reports for each chemical over threshold quantities must be submitted on or before July 1 each year and must cover activities that occurred at the facility during the previous year. In 1999, EPA promulgated a final rule on persistent bioaccumulative toxics (PBTs). This rule added several chemicals to the EPCRA Section 313 list of toxic …
Date:
December 12, 2007
Creator:
Ecology and Air Quality Group & Hinojosa, Hector
Object Type:
Report
System:
The UNT Digital Library
[2007 John Murphy Award for Excellence in Copy Editing]
Texas Daily Newspaper Association's Second Call for Entries for the 2007 John Murphy Award for Excellence in Copy Editing. TDNA's Annual Contenst for Member Newspaper Copyeditors and Sub-Editors. All nominations must be submitted no later than January 15, 2008.
Date:
December 10, 2007
Creator:
Texas Daily Newspaper Association
Object Type:
Text
System:
The UNT Digital Library
Abilene Philharmonic Playbill: December 1-January 12, 2008
Program for an Abilene Philharmonic concert that ran from December 1st to January 12th during the 58th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
December 2007
Creator:
Abilene Philharmonic
Object Type:
Pamphlet
System:
The Portal to Texas History
Absolute Calibration of Image Plate for electrons at energy between 100 keV and 4 MeV
The authors measured the absolute response of image plate (Fuji BAS SR2040) for electrons at energies between 100 keV to 4 MeV using an electron spectrometer. The electron source was produced from a short pulse laser irradiated on the solid density targets. This paper presents the calibration results of image plate Photon Stimulated Luminescence PSL per electrons at this energy range. The Monte Carlo radiation transport code MCNPX results are also presented for three representative incident angles onto the image plates and corresponding electron energies depositions at these angles. These provide a complete set of tools that allows extraction of the absolute calibration to other spectrometer setting at this electron energy range.
Date:
December 10, 2007
Creator:
Chen, H; Back, N L; Eder, D C; Ping, Y; Song, P M & Throop, A
Object Type:
Article
System:
The UNT Digital Library
Accelerating PV Cost Effectiveness Through Systems Design, Engineering, and Quality Assurance: Final Subcontract Report, June 2007
This report describes PowerLight Corporation's significant progress toward the reduction of installed costs for commercial-scale, rooftop PV systems.
Date:
December 1, 2007
Creator:
Botkin, J.
Object Type:
Report
System:
The UNT Digital Library
Accelerator-based neutrino oscillation experiments
Neutrino oscillations were first discovered by experiments looking at neutrinos coming from extra-terrestrial sources, namely the sun and the atmosphere, but we will be depending on earth-based sources to take many of the next steps in this field. This article describes what has been learned so far from accelerator-based neutrino oscillation experiments, and then describe very generally what the next accelerator-based steps are. In section 2 the article discusses how one uses an accelerator to make a neutrino beam, in particular, one made from decays in flight of charged pions. There are several different neutrino detection methods currently in use, or under development. In section 3 these are presented, with a description of the general concept, an example of such a detector, and then a brief discussion of the outstanding issues associated with this detection technique. Finally, section 4 describes how the measurements of oscillation probabilities are made. This includes a description of the near detector technique and how it can be used to make the most precise measurements of neutrino oscillations.
Date:
December 1, 2007
Creator:
Harris, Deborah A.
Object Type:
Article
System:
The UNT Digital Library
Access to Government Information In the United States
The Constitution of the United States makes no specific allowance for any one of the co-equal branches to have access to information held by the others and contains no provision expressly establishing a procedure for, or a right of, public access to government information. Nonetheless, Congress has legislated various public access laws. These include two records access statutes — the Freedom of Information Act and the Privacy Act — and two meetings access statutes — the Federal Advisory Committee Act and the Government in the Sunshine Act. This report provides background on the issue of government transparency and examines relevant litigation.
Date:
December 5, 2007
Creator:
Relyea, Harold C. & Kolakowski, Michael W.
Object Type:
Report
System:
The UNT Digital Library
Accessibility and Authenticity in Julia Smith's Cynthia Parker
In 1939, composer Julia Smith's first opera Cynthia Parker dramatized the story of a Texas legend. Smith manipulated music, text, and visual images to make the opera accessible for the audience in accordance with compositional and institutional practices in American opera of the 1930s. Transparent musical themes and common Native Americans stereotypes are used to define characters. Folk music is presented as diegetic, creating a sense of authenticity that places the audience into the opera's Western setting. The opera is codified for the audience using popular idioms, resulting in initial but not lasting success.
Date:
December 2007
Creator:
Buehner, Katie R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Accuracy of Analog Fiber-Optic Links in Pulsed Radiation Environments
Interferometric fiber-optic links used in pulsed-power experiments are evaluated for accuracy in the presence of radiation fields which alter fiber transmission. Amplitude-modulated format (e.g., Mach-Zehnder) and phase-modulated formats are compared. Historically, studies of radiation effects on optical fibers have focused on degradation and recovery of the fibers transmission properties; such work is either in the context of survivability of fibers in catastrophic conditions or suitability of fibers installed for command and control systems within an experimental facility [1], [2]. In this work, we consider links used to transmit realtime diagnostic data, and we analyze the error introduced by radiation effects during the drive pulse. The result is increased uncertainties in key parameters required to unfold the sinusoidal transfer function. Two types of modulation are considered: amplitude modulation typical of a Mach-Zehnder (M-Z) modulator [3], and phase modulation, which offers more flexible demodulation options but relies on the spatiotemporal coherence of the light in the fiber. The M-Z link is shown schematically in Fig. 1, and the phase-modulated link is shown in Fig. 2. We present data from two experimental environments: one with intense, controlled radiation fields to simulate conditions expected at the next generation of pulsed-power facilities, and the second …
Date:
December 1, 2007
Creator:
E. K. Miller, G. S. Macrum, I. J. McKenna, et al.
Object Type:
Article
System:
The UNT Digital Library
Acid Catalysis in Basic Solution: A Supramolecular Host PromotesOrthoformate Hydrolysis
Though many enzymes can promote chemical reactions by tuning substrate properties purely through the electrostatic environment of a docking cavity, this strategy has proven challenging to mimic in synthetic host-guest systems. Here we report a highly-charged, water soluble, metal-ligand assembly with a hydrophobic interior cavity that thermodynamically stabilizes protonated substrates and consequently catalyzes the normally acidic hydrolysis of orthoformates in basic solution, with rate accelerations of up to 890-fold. The catalysis reaction obeys Michaelis-Menten kinetics, exhibits competitive inhibition, and the substrate scope displays size selectivity consistent with the constrained binding environment of the molecular host. Synthetic chemists have long endeavored to design host molecules capable of selectively binding slow-reacting substrates and catalyzing their chemical reactions. While synthetic catalysts are often site-specific and require certain properties of the substrate to insure catalysis, enzymes are often able to modify basic properties of the bound substrate such as pK{sub a} in order to enhance reactivity. Two common motifs used by nature to activate otherwise unreactive compounds are the precise arrangement of hydrogen-bonding networks and electrostatic interactions between the substrate and adjacent residues of the protein. Precise arrangement of hydrogen bonding networks near the active sites of proteins can lead to well-tuned pK{sub a}-matching, …
Date:
December 12, 2007
Creator:
Pluth, Michael D.; Bergman, Robert G. & Raymond, Kenneth N.
Object Type:
Article
System:
The UNT Digital Library
Acquisition Services Reorganization at the General Services Administration
This report discusses the reorganization of the General Services Administration (GSA) after the GSA's Inspector General discovered that funds were acquired in a manner not consistent with congressionally authorized procedures. Congressional approval was required for this reorganization due to the replacement of the congressionally authorized fund with a new one.
Date:
December 4, 2007
Creator:
Smith, Stephanie
Object Type:
Report
System:
The UNT Digital Library
ACRF Instrumentation Status: New, Current, and Future - November – December 2007
The purpose of this report is to provide a concise but comprehensive overview of Atmospheric Radiation Measurement Climate Research Facility instrumentation status. The report is divided into the following four sections: (1) new instrumentation in the process of being acquired and deployed, (2) existing instrumentation and progress on improvements or upgrades, (3) proposed future instrumentation, and (4) Small Business Innovation Research instrument development.
Date:
December 1, 2007
Creator:
Voyles, J. W.
Object Type:
Report
System:
The UNT Digital Library
Across-the-Board Spending Cuts in End-of Session Appropriations Acts
This report examines the use of across-the-board spending cuts in the end-of-session appropriations acts for FY2000-FY2006 identified above, assessing the budgetary context leading to the spending cut, recounting the legislative action on the spending cut provision, and reviewing the provision’s design and implementation.
Date:
December 13, 2007
Creator:
Keith, Robert
Object Type:
Report
System:
The UNT Digital Library
Actinide Sorption in Rainier Mesa Tunnel Waters from the Nevada Test Site
The sorption behavior of americium (Am), plutonium (Pu), neptunium (Np), and uranium (U) in perched Rainier Mesa tunnel water was investigated. Both volcanic zeolitized tuff samples and groundwater samples were collected from Rainier Mesa, Nevada Test Site, NV for a series of batch sorption experiments. Sorption in groundwater with and without the presence of dissolved organic matter (DOM) was investigated. Am(III) and Pu(IV) are more soluble in groundwater that has high concentrations of DOM. The sorption K{sub d} for Am(III) and Pu(IV) on volcanic zeolitized tuff was up to two orders of magnitude lower in samples with high DOM (15 to 19 mg C/L) compared to samples with DOM removed (< 0.4 mg C/L) or samples with naturally low DOM (0.2 mg C/L). In contrast, Np(V) and U(VI) sorption to zeolitized tuff was much less affected by the presence of DOM. The Np(V) and U(VI) sorption Kds were low under all conditions. Importantly, the DOM was not found to significantly sorb to the zeolitized tuff during these experiment. The concentration of DOM in groundwater affects the transport behavior of actinides in the subsurface. The mobility of Am(III) and Pu(IV) is significantly higher in groundwater with elevated levels of DOM resulting …
Date:
December 17, 2007
Creator:
Zhao, P.; Zavarin, M.; Leif, R.; Powell, B.; Singleton, M.; Lindvall, R. et al.
Object Type:
Report
System:
The UNT Digital Library
Advanced Branching Control and Characterization of Inorganic Semiconducting Nanocrystals
The ability to finely tune the size and shape of inorganic semiconducting nanocrystals is an area of great interest, as the more control one has, the more applications will be possible for their use. The first two basic shapes develped in nanocrystals were the sphere and the anistropic nanorod. the II_VI materials being used such as Cadmium Selenide (CdSe) and Cadmium Telluride (CdTe), exhibit polytypism, which allows them to form in either the hexagonally packed wurtzite or cubically packed zinc blende crystalline phase. The nanorods are wurtzite with the length of the rod growing along the c-axis. As this grows, stacking faults may form, which are layers of zinc blende in the otherwise wurtzite crystal. Using this polytypism, though, the first generation of branched crystals were developed in the form of the CdTe tetrapod. This is a nanocrystal that nucleates in the zincblend form, creating a tetrahedral core, on which four wurtzite arms are grown. This structure opened up the possibility of even more complex shapes and applications. This disseration investigates the advancement of branching control and further understanding the materials polytypism in the form of the stacking faults in nanorods.
Date:
December 31, 2007
Creator:
Hughes, Steven Michael
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Advanced Materials and Processes for High Energy Resolution Room Temperature Gamma Ray Spectrometers
A significant amount of progress has been achieved in the development of the novel vacuum distillation method described in the proposal. The process for the purification of Te was fully developed and characterized in a series of trials. The purification effect was confirmed with GDMS sample analysis and indicates the process yields very high purity Te metal. Results of this initial process study have been submitted for publication in the Proceedings of the SPIE and will be presented on August 28, 2007 at the SPIE Optics and Photonics 2007 conference in San Diego, CA. Concurrent to the development of the Te process, processes for the purification of Cd, Zn, and Mn have also progressed. The development of the processes for Cd and Zn are nearly complete, while the development of the process for Mn is still in its infancy. It is expected that a full characterization of the Cd process will be completed within the next quarter, followed by Zn. Parallel to those characterization studies, efforts will be made to further develop the Mn purification process. Zone melting work for Te and Cd has also been efforted as per the project work schedule. Initial trials have been completed and the …
Date:
December 12, 2007
Creator:
McGregor, Douglas S.
Object Type:
Report
System:
The UNT Digital Library
Advanced Reservoir Imaging Using Frequency-Dependent Seismic Attributes
Our report concerning advanced imaging and interpretation technology includes the development of theory, the implementation of laboratory experiments and the verification of results using field data. We investigated a reflectivity model for porous fluid-saturated reservoirs and demonstrated that the frequency-dependent component of the reflection coefficient is asymptotically proportional to the reservoir fluid mobility. We also analyzed seismic data using different azimuths and offsets over physical models of fractures filled with air and water. By comparing our physical model synthetics to numerical data we have identified several diagnostic indicators for quantifying the fractures. Finally, we developed reflectivity transforms for predicting pore fluid and lithology using rock-property statistics from 500 reservoirs in both the shelf and deep-water Gulf of Mexico. With these transforms and seismic AVO gathers across the prospect and its down-dip water-equivalent reservoir, fluid saturation can be estimated without a calibration well that ties the seismic. Our research provides the important additional mechanisms to recognize, delineate, and validate new hydrocarbon reserves and assist in the development of producing fields.
Date:
December 31, 2007
Creator:
Hilterman, Fred; Patzek, Tad; Goloshubin, Gennady; Silin, Dmitriy; Sullivan, Charlotte & Korneev, Valeri
Object Type:
Report
System:
The UNT Digital Library