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469 Matching Results
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Intelligence Issues for Congress
This report explores the various issues currently facing Congress in regards to intelligence and counterterrorism activities, including the Intelligence Reform and Terrorism Prevention Act (P.L. 108-458), signed in December 2004; the position of Director of National Intelligence (DNI), which that act created; the importance of collaborative efforts between various intelligence agencies to successfully carry out counterterrorism measures; and other pieces of legislation relevant to such matters.
Date:
April 20, 2009
Creator:
Best, Richard A., Jr.
Object Type:
Report
System:
The UNT Digital Library
The United Arab Emirates (UAE): Issues for U.S. Policy
This report describes the open economy and society of the United Arab Emirates (UAE), as well as U.S. concern over proliferation of advanced technology due to said open economy and the UAE's lax export controls. This report describes these issues in relation to a recently-signed U.S.-UAE civilian nuclear agreement. It also provides a general description of the UAE's government and political structure, as well as the effects of the recent global economic downturn on the UAE in general and on the city of Dubai in particular.
Date:
April 20, 2009
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
The Energy Diameter Effect
Various relations for the detonation energy and velocity as they relate to the inverse radius of the cylinder are explored. The detonation rate-inverse slope relation seen in reactive flow models can be used to derive the familiar Eyring equation. Generalized inverse radii can be shown to fit large quantities of cylinder and sphere results. A rough relation between detonation energy and detonation velocity is found from collected JWL values. Cylinder test data for ammonium nitrate mixes down to 6.35 mm radii are presented, and a size energy effect is shown to exist in the Cylinder test data. The relation that detonation energy is roughly proportional to the square of the detonation velocity is shown by data and calculation.
Date:
April 20, 2007
Creator:
Souers, P; Vitello, P; Garza, R & Hernandez, A
Object Type:
Article
System:
The UNT Digital Library
Climate Modeling using High-Performance Computing
The Center for Applied Scientific Computing (CASC) and the LLNL Climate and Carbon Science Group of Energy and Environment (E&E) are working together to improve predictions of future climate by applying the best available computational methods and computer resources to this problem. Over the last decade, researchers at the Lawrence Livermore National Laboratory (LLNL) have developed a number of climate models that provide state-of-the-art simulations on a wide variety of massively parallel computers. We are now developing and applying a second generation of high-performance climate models.
Date:
April 20, 2006
Creator:
Mirin, A. A. & Wickett, M.
Object Type:
Report
System:
The UNT Digital Library
Geothermal Direct Use Feasibility Study on the Fort Bidwell Indian Reservation
The Fort Bidwell Indian Reservation (FBIR) is rich in renewable energy resources. Development of its geothermal resources has the potential to profoundly affect the energy and economic future of the FBIC. Geothermal energy can contribute to making the reservation energy self-sufficient and, potentially, an energy exporter. The feasibility study assessed the feasibility of installing a geothermal district heating system to provide low-cost, efficient heating of existing and planned residences, community buildings and water, using an existing geothermal well, FB-3.
Date:
April 20, 2007
Creator:
Merrick, Dale
Object Type:
Report
System:
The UNT Digital Library
Structures in Molecular Clouds: Modeling
We attempt to predict the observed morphology, column density and velocity gradient of Pillar II of the Eagle Nebula, using Rayleigh Taylor (RT) models in which growth is seeded by an initial perturbation in density or in shape of the illuminated surface, and cometary models in which structure is arises from a initially spherical cloud with a dense core. Attempting to mitigate suppression of RT growth by recombination, we use a large cylindrical model volume containing the illuminating source and the self-consistently evolving ablated outflow and the photon flux field, and use initial clouds with finite lateral extent. An RT model shows no growth, while a cometary model appears to be more successful at reproducing observations.
Date:
April 20, 2006
Creator:
Kane, J. O.; Mizuta, A.; Pound, M. W.; Remington, B. A. & Ryutov, D. D.
Object Type:
Article
System:
The UNT Digital Library
Feasibility of using biological degradation for the on-sitet reatment of mixed wastes
This research was conducted to investigate the feasibility of applying microbial biodegradation as a treatment technology for wastes containing radioactive elements and organic solvents (mixed wastes). In this study, we focused our efforts on the treatment of wastes generated by biomedical research as the result of purifying tritium labeled compounds by high-performance liquid chromatography (HPLC). These wastes are typically 80 percent water with 20 percent acetonitrile or methanol or a mixture of both. The objective was to determine the potential of using biodegradation to treat the solvent component of tritiated mixed waste to a concentration below the land disposal restriction standard (1mg/L for acetonitrile). Once the standard is reached, the remaining radioactive waste is no longer classified as a mixed waste and it can then be solidified and placed in a secure landfill. This investigation focused on treating a 10 percent acetonitrile solution, which was used as a non-radioactive surrogate for HPLC waste, in a bioreactor. The results indicated that the biodegradation process could treat this solution down to less than 1 mg/L to meet the land disposal restriction standard.
Date:
April 20, 2004
Creator:
Stringfellow, William T.; Komada, Tatsuyuki & Chang, Li-Yang
Object Type:
Article
System:
The UNT Digital Library
Transportation Routing Analysis Georgraphic Information System (WebTRAGIS) User's Manual
In the early 1980s, Oak Ridge National Laboratory (ORNL) developed two transportation routing models: HIGHWAY, which predicts truck transportation routes, and INTERLINE, which predicts rail transportation routes. Both of these models have been used by the U.S. Department of Energy (DOE) community for a variety of routing needs over the years. One of the primary uses of the models has been to determine population-density information, which is used as input for risk assessment with the RADTRAN model, which is available on the TRANSNET computer system. During the recent years, advances in the development of geographic information systems (GISs) have resulted in increased demands from the user community for a GIS version of the ORNL routing models. In April 1994, the DOE Transportation Management Division (EM-261) held a Baseline Requirements Assessment Session with transportation routing experts and users of the HIGHWAY and INTERLINE models. As a result of the session, the development of a new GIS routing model, Transportation Routing Analysis GIS (TRAGIS), was initiated. TRAGIS is a user-friendly, GIS-based transportation and analysis computer model. The older HIGHWAY and INTERLINE models are useful to calculate routes, but they cannot display a graphic of the calculated route. Consequently, many users have experienced …
Date:
April 20, 2000
Creator:
Michelhaugh, R. D.
Object Type:
Report
System:
The UNT Digital Library
Spin Spectrometer at the ALS and APS
A spin-resolving photoelectron spectrometer, the"Spin Spectrometer," has been designed and built. It has been utilized at both the Advanced Light Source in Berkeley, CA, and the Advanced Photon Source in Argonne, IL. Technical details and an example of experimental results are presented here.
Date:
April 20, 2007
Creator:
Laboratory, Lawrence Livermore National; Missouri-Rolla, University of; Technologies, Boyd; Morton, Simon A; Morton, Simon A; Tobin, James G et al.
Object Type:
Article
System:
The UNT Digital Library
Speech recognition systems on the Cell Broadband Engine
In this paper we describe our design, implementation, and first results of a prototype connected-phoneme-based speech recognition system on the Cell Broadband Engine{trademark} (Cell/B.E.). Automatic speech recognition decodes speech samples into plain text (other representations are possible) and must process samples at real-time rates. Fortunately, the computational tasks involved in this pipeline are highly data-parallel and can receive significant hardware acceleration from vector-streaming architectures such as the Cell/B.E. Identifying and exploiting these parallelism opportunities is challenging, but also critical to improving system performance. We observed, from our initial performance timings, that a single Cell/B.E. processor can recognize speech from thousands of simultaneous voice channels in real time--a channel density that is orders-of-magnitude greater than the capacity of existing software speech recognizers based on CPUs (central processing units). This result emphasizes the potential for Cell/B.E.-based speech recognition and will likely lead to the future development of production speech systems using Cell/B.E. clusters.
Date:
April 20, 2007
Creator:
Liu, Y.; Jones, H.; Vaidya, S.; Perrone, M.; Tydlitat, B. & Nanda, A.
Object Type:
Article
System:
The UNT Digital Library
Formation of Pillars at the Boundaries between HII Regions and Molecular Clouds
We investigate numerically the hydrodynamic instability of an ionization front (IF) accelerating into a molecular cloud, with imposed initial perturbations of different amplitudes. When the initial amplitude is small, the imposed perturbation is completely stabilized and does not grow. When the initial perturbation amplitude is large enough, roughly the ratio of the initial amplitude to wavelength is greater than 0.02, portions of the IF temporarily separate from the molecular cloud surface, locally decreasing the ablation pressure. This causes the appearance of a large, warm HI region and triggers nonlinear dynamics of the IF. The local difference of the ablation pressure and acceleration enhances the appearance and growth of a multimode perturbation. The stabilization usually seen at the IF in the linear regimes does not work due to the mismatch of the modes of the perturbations at the cloud surface and in density in HII region above the cloud surface. Molecular pillars are observed in the late stages of the large amplitude perturbation case. The velocity gradient in the pillars is in reasonably good agreement with that observed in the Eagle Nebula. The initial perturbation is imposed in three different ways: in density, in incident photon number flux, and in the …
Date:
April 20, 2006
Creator:
Mizuta, A.; Kane, J. O.; Pound, M. W.; Remington, B. A.; Ryutov, D. D. & Takabe, H.
Object Type:
Article
System:
The UNT Digital Library
Numerical Simulation of a Laboratory-Scale Turbulent SlotFlame
We present three-dimensional, time-dependent simulations ofthe flowfield of a laboratory-scale slot burner. The simulations areperformed using an adaptive time-dependent low Mach number combustionalgorithm based on a second-order projection formulation that conservesboth species mass and total enthalpy. The methodology incorporatesdetailed chemical kinetics and a mixture model for differential speciesdiffusion. Methane chemistry and transport are modeled using the DRM-19mechanism along with its associated thermodynamics and transportdatabases. Adaptive mesh refinementdynamically resolves the flame andturbulent structures. Detailedcomparisons with experimental measurementsshow that the computational results provide a good prediction of theflame height, the shape of the time-averaged parabolic flame surfacearea, and the global consumption speed (the volume per second ofreactants consumed divided by the area of the time-averaged flame). Thethickness of the computed flamebrush increases in the streamwisedirection, and the flamesurface density profiles display the same generalshapes as the experiment. The structure of the simulated flame alsomatches the experiment; reaction layers are thin (typically thinner than1 mm) and the wavelengths of large wrinkles are 5--10 mm. Wrinklesamplify to become long fingers of reactants which burn through at a neckregion, forming isolated pockets of reactants. Thus both the simulatedflame and the experiment are in the "corrugated flameletregime."
Date:
April 20, 2006
Creator:
Bell, John B.; Day, Marcus S.; Grcar, Joseph F.; Lijewski,Michael J.; Driscoll, James F. & Filatyev, Sergei A.
Object Type:
Article
System:
The UNT Digital Library
Benchmark Measurements of the Ionization Balance of Non-LTE Gold
The authors present a series of benchmark measurements of the ionization balance of well characterized gold plasmas with and without external radiation fields at electron densities near 10{sup 21} cm{sup -3} and various electron temperatures spanning the range 0.8 to 2.4 keV. They have analyzed time- and space-resolved M-shell gold emission spectra using a sophisticated collisional-radiative model with hybrid level structure, finding average ion changes <Z> ranging from 42 to 50. At the lower temperatures, the spectra exhibit significant sensitivity to external radiation fields and include emission features from complex N-shell ions not previously studied at these densities. The measured spectra and inferred <Z> provide a stringent test for non-local thermodynamic equilibrium (non-LTE) models of complex high-Z ions.
Date:
April 20, 2007
Creator:
Heeter, R. F.; Hansen, S. B.; Fournier, K. B.; Foord, M. E.; Froula, D. H.; Mackinnon, A. J. et al.
Object Type:
Article
System:
The UNT Digital Library
Potential Alternative Energy Technologies on the Outer Continental Shelf.
This technical memorandum (TM) describes the technology requirements for three alternative energy technologies for which pilot and/or commercial projects on the U.S. Outer Continental Shelf (OCS) are likely to be proposed within the next five to seven years. For each of the alternative technologies--wind, wave, and ocean current--the TM first presents an overview. After each technology-specific overview, it describes the technology requirements for four development phases: site monitoring and testing, construction, operation, and decommissioning. For each phase, the report covers the following topics (where data are available): facility description, electricity generated, ocean area (surface and bottom) occupied, resource requirements, emissions and noise sources, hazardous materials stored or used, transportation requirements, and accident potential. Where appropriate, the TM distinguishes between pilot-scale (or demonstration-scale) facilities and commercial-scale facilities.
Date:
April 20, 2007
Creator:
Elcock, D. & Assessment, Environmental
Object Type:
Report
System:
The UNT Digital Library
Molecular beam epitaxy of InN dots on nitrided sapphire
A series of self-assembled InN dots are grown by radio frequency (RF) plasma-assisted molecular beam epitaxy (MBE) directly on nitrided sapphire. Initial nitridation of the sapphire substrates at 900 C results in the formation of a rough AlN surface layer, which acts as a very thin buffer layer and facilitates the nucleation of the InN dots according to the Stranski-Krastanow growth mode, with a wetting layer of {approx}0.9 nm. Atomic force microscopy (AFM) reveals that well-confined InN nanoislands with the greatest height/width at half-height ratio of 0.64 can be grown at 460 C. Lower substrate temperatures result in a reduced aspect ratio due to a lower diffusion rate of the In adatoms, whereas the thermal decomposition of InN truncates the growth at T>500 C. The densities of separated dots vary between 1.0 x 10{sup 10} cm{sup -2} and 2.5 x 10{sup 10} cm{sup -2} depending on the growth time. Optical response of the InN dots under laser excitation is studied with apertureless near-field scanning optical microscopy and photoluminescence spectroscopy, although no photoluminescence is observed from these samples. In view of the desirable implementation of InN nanostructures into photonic devices, the results indicate that nitrided sapphire is a suitable substrate for …
Date:
April 20, 2007
Creator:
Romanyuk, Yaroslav E.; Dengel, Radu-Gabriel; Stebounova, LarissaV. & Leone, Stephen R.
Object Type:
Article
System:
The UNT Digital Library
Is the beta phase maximal?
indicates that 2|Vub / Vcb/ Vus| = (1-z) with z given by z = 0.19 +(-) 0.14. This fact implies that irrespective of the form of the quark Yukawa matrices, the measured value of the SM CP phase beta is approximately the maximum allowed by the measured absolute values of the CKM elements. This is beta = pi/6 - z/sqrt{3} for gamma = pi/3 + z/sqrt{3}, which implies alpha = pi/2. Alternatively, assuming that beta is exactly maximal and using the experimental measurement, sin(2beta) = 0.726+(-) 0.037, the phase gamma is predicted to be gamma = pi/2 - beta = 66.3 +(-) 1.7. The maximality of beta, if confirmed by the near-future experiments, may give us some clues as to the origin of CP violation.
Date:
April 20, 2005
Creator:
Ferrandis, Javier & Ferrandis, Javier
Object Type:
Article
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 37, No. 128, Ed. 1 Thursday, April 20, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
April 20, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 37, No. 129, Ed. 1 Thursday, April 20, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
April 20, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 38, No. 130, Ed. 1 Friday, April 20, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
April 20, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Port Aransas South Jetty (Port Aransas, Tex.), Vol. 36, No. 16, Ed. 1 Thursday, April 20, 2006
Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with extensive advertising.
Date:
April 20, 2006
Creator:
Judson, Mary Henkel
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 36, No. 126, Ed. 1 Wednesday, April 20, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
April 20, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 38, No. 132, Ed. 1 Friday, April 20, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
April 20, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Dallas, Tex.), Vol. 29, No. 9, Ed. 1 Wednesday, April 20, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
April 20, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
[WASP Spring 2001 Board Meeting]
Agenda for the WASP board meeting held April 20, 2001 in Corpus Christi, Texas. At the end of the list of new business items, a handwritten note states, "Disposition of funds when we dissolve."
Date:
April 20, 2001
Creator:
Women Airforce Service Pilots (U.S.)
Object Type:
Report
System:
The Portal to Texas History