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1,530 Matching Results
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Rotating Aperture System
A rotating aperture system includes a low-pressure vacuum pumping stage with apertures for passage of a deuterium beam. A stator assembly includes holes for passage of the beam. The rotor assembly includes a shaft connected to a deuterium gas cell or a crossflow venturi that has a single aperture on each side that together align with holes every rotation. The rotating apertures are synchronized with the firing of the deuterium beam such that the beam fires through a clear aperture and passes into the Xe gas beam stop. Portions of the rotor are lapped into the stator to improve the sealing surfaces, to prevent rapid escape of the deuterium gas from the gas cell.
Date:
January 18, 2005
Creator:
Rusnak, Brian; Hall, James M.; Shen, Stewart & Wood, Richard L.
Object Type:
Patent
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 90, No. 110, Ed. 1 Tuesday, January 18, 2005
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 18, 2005
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Scoria Cone Construction Mechanism, Lathrop Wells Volcano, Southern Nevada
Scoria cones are commonly assumed to have been constructed by the accumulation of ballistically-ejected clasts from discrete and relatively coarse-grained Strombolian bursts and subsequent avalanching such that the cone slopes are at or near the angle of repose for loose scoria. The cone at the hawaiitic Lathrop Wells volcano, southern Nevada, contains deposits that are consistent with the above processes during early cone-building phases; these early deposits are composed mainly of coarse lapilli and fluidal bombs and are partially welded, indicating relatively little cooling during flight. However, the bulk of the cone is comprised of relatively fine-grained (ash and lapilli), planar beds with no welding, even within a few tens of meters of the vent. This facies is consistent with deposition by direct fallout from sustained eruption columns of relatively well-fragmented material, primarily mantling cone slopes and with a lesser degree of avalanching than is commonly assumed. A laterally extensive fallout deposit (up to 20 km from the vent) is inferred to have formed contemporaneously with these later cone deposits. This additional mechanism for construction of scoria cones may also be important at other locations, particularly where the magmas are relatively high in volatile content and where conditions promote the …
Date:
January 18, 2005
Creator:
Valentine, G.; Krier, D.; Perry, F. & Heiken, G.
Object Type:
Report
System:
The UNT Digital Library
The Sealy News (Sealy, Tex.), Vol. 118, No. 5, Ed. 1 Tuesday, January 18, 2005
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
January 18, 2005
Creator:
Griffin, Joanie & Horecka, Bobby
Object Type:
Newspaper
System:
The Portal to Texas History
Serbia and Montenegro: Current Situation and U.S. Policy
None
Date:
January 18, 2005
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Simulations of neutralized final focus
In order to drive an inertial fusion target or study high energy density physics with heavy ion beams, the beam radius must be focused to < 3 mm and the pulse length must be compressed to < 10 ns. The conventional scheme for temporal pulse compression makes use of an increasing ion velocity to compress the beam as it drifts and beam space charge to stagnate the compression before final focus. Beam compression in a neutralizing plasma does not require stagnation of the compression, enabling a more robust method. The final pulse shape at the target can be programmed by an applied velocity tilt. In this paper, neutralized drift compression is investigated. The sensitivity of the compression and focusing to beam momentum spread, plasma, and magnetic field conditions is studied with realistic driver examples. Using the 3D particle-in-cell code, we examine issues associated with self-field generation, stability, and vacuum-neutralized transport transition and focusing.
Date:
January 18, 2005
Creator:
Welch, D. R.; Rose, D. V.; Genoni, T. C.; Yu, S. S. & Barnard, J. J.
Object Type:
Article
System:
The UNT Digital Library
Supplemental Educational Services for Children from Low-Income Families Under ESEA Title I-A
None
Date:
January 18, 2005
Creator:
Smole, David P.
Object Type:
Report
System:
The UNT Digital Library
Towards p-type doping of ZnO by ion implantation
Zinc oxide is a very attractive material for a range of optoelectronic devices including blue light-emitting diodes and laser diodes. Though n-type doping has been successfully achieved, p-type doing of ZnO is still a challenge that must be overcome before p-n junction devices can be realized. Ion implantation is widely used in the microelectronics industry for selective area doping and device isolation. Understanding damage accumulation and recrystallization processes is important for achieving selective area doping. In this study, As (potential p-type dopant) ion implantation and annealing studies were carried out. ZnO samples were implanted with high dose (1.4 x 10{sup 17} ions/cm{sup 2}) 300 keV As ions at room temperature. Furnace annealing of samples in the range of 900 C to 1200 C was employed to achieve recrystallization of amorphous layers and electrical activation of the dopant. Rutherford backscattering/channeling spectrometry, transmission electron microscopy and cathodolumiescence spectroscopy were used to monitor damage accumulation and annihilation behavior in ZnO. Results of this study have significant implications for p-type doing of ZnO by ion implantation.
Date:
January 18, 2005
Creator:
Coleman, V; Tan, H H; Jagadish, C; Kucheyev, S; Phillips, M & Zou, J
Object Type:
Article
System:
The UNT Digital Library
Unsymmetric ordering using a constrained Markowitz scheme
We present a family of ordering algorithms that can be used as a preprocessing step prior to performing sparse LU factorization. The ordering algorithms simultaneously achieve the objectives of selecting numerically good pivots and preserving the sparsity. We describe the algorithmic properties and challenges in their implementation. By mixing the two objectives we show that we can reduce the amount of fill-in in the factors and reduce the number of numerical problems during factorization. On a set of large unsymmetric real problems, we obtained the median reductions of 12% in the factorization time, of 13% in the size of the LU factors, of 20% in the number of operations performed during the factorization phase, and of 11% in the memory needed by the multifrontal solver MA41-UNS. A byproduct of this ordering strategy is an incomplete LU-factored matrix that can be used as a preconditioner in an iterative solver.
Date:
January 18, 2005
Creator:
Amestoy, Patrick R.; S., Xiaoye & Pralet, Stephane
Object Type:
Article
System:
The UNT Digital Library
Yucca Mountain Feature, Event, and Process (FEP) Analysis
A Total System Performance Assessment (TSPA) model was developed for the U.S. Department of Energy (DOE) Yucca Mountain Project (YMP) to help demonstrate compliance with applicable postclosure regulatory standards and support the License Application (LA). Two important precursors to the development of the TSPA model were (1) the identification and screening of features, events, and processes (FEPs) that might affect the Yucca Mountain disposal system (i.e., FEP analysis), and (2) the formation of scenarios from screened in (included) FEPs to be evaluated in the TSPA model (i.e., scenario development). YMP FEP analysis and scenario development followed a five-step process: (1) Identify a comprehensive list of FEPs potentially relevant to the long-term performance of the disposal system. (2) Screen the FEPs using specified criteria to identify those FEPs that should be included in the TSPA analysis and those that can be excluded from the analysis. (3) Form scenarios from the screened in (included) FEPs. (4) Screen the scenarios using the same criteria applied to the FEPs to identify any scenarios that can be excluded from the TSPA, as appropriate. (5) Specify the implementation of the scenarios in the computational modeling for the TSPA, and document the treatment of included FEPs. This …
Date:
January 18, 2005
Creator:
Freeze, G.
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 34, No. 17, Ed. 1 Friday, February 18, 2005
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 18, 2005
Creator:
Delaney, Darcy
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Aging and Gene Expression in the Primate Brain
It is well established that gene expression levels in many organisms change during the aging process, and the advent of DNA microarrays has allowed genome-wide patterns of transcriptional changes associated with aging to be studied in both model organisms and various human tissues. Understanding the effects of aging on gene expression in the human brain is of particular interest, because of its relation to both normal and pathological neurodegeneration. Here we show that human cerebral cortex, human cerebellum, and chimpanzee cortex each undergo different patterns of age-related gene expression alterations. In humans, many more genes undergo consistent expression changes in the cortex than in the cerebellum; in chimpanzees, many genes change expression with age in cortex, but the pattern of changes in expression bears almost no resemblance to that of human cortex. These results demonstrate the diversity of aging patterns present within the human brain, as well as how rapidly genome-wide patterns of aging can evolve between species; they may also have implications for the oxidative free radical theory of aging, and help to improve our understanding of human neurodegenerative diseases.
Date:
February 18, 2005
Creator:
Fraser, Hunter B.; Khaitovich, Philipp; Plotkin, Joshua B.; Paabo, Svante & Eisen, Michael B.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 106, No. 270, Ed. 1 Friday, February 18, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 18, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Architecture and High-Resolution Structure of Bacillus thuringiensis and Bacillus cereus Spore Coat Surfaces
We have utilized atomic force microscopy (AFM) to visualize the native surface topology and ultrastructure of Bacillus thuringiensis and Bacillus cereus spores in water and in air. AFM was able to resolve the nanostructure of the exosporium and three distinctive classes of appendages. Removal of the exosporium exposed either a hexagonal honeycomb layer (B. thuringiensis) or a rodlet outer spore coat layer (B. cereus). Removal of the rodlet structure from B. cereus spores revealed an underlying honeycomb layer similar to that observed with B. thuringiensis spores. The periodicity of the rodlet structure on the outer spore coat of B. cereus was {approx}8 nm, and the length of the rodlets was limited to the cross-patched domain structure of this layer to {approx}200 nm. The lattice constant of the honeycomb structures was {approx}9 nm for both B. cereus and B. thuringiensis spores. Both honeycomb structures were composed of multiple, disoriented domains with distinct boundaries. Our results demonstrate that variations in storage and preparation procedures result in architectural changes in individual spore surfaces, which establish AFM as a useful tool for evaluation of preparation and processing ''fingerprints'' of bacterial spores. These results establish that high-resolution AFM has the capacity to reveal species-specific assembly …
Date:
February 18, 2005
Creator:
Plomp, Marco; Leighton, Terrance J.; Wheeler, Katherine E. & Malkin, Alexander J.
Object Type:
Article
System:
The UNT Digital Library
Automated High Throughput Drug Target Crystallography
The molecular structures of drug target proteins and receptors form the basis for 'rational' or structure guided drug design. The majority of target structures are experimentally determined by protein X-ray crystallography, which as evolved into a highly automated, high throughput drug discovery and screening tool. Process automation has accelerated tasks from parallel protein expression, fully automated crystallization, and rapid data collection to highly efficient structure determination methods. A thoroughly designed automation technology platform supported by a powerful informatics infrastructure forms the basis for optimal workflow implementation and the data mining and analysis tools to generate new leads from experimental protein drug target structures.
Date:
February 18, 2005
Creator:
Rupp, B
Object Type:
Article
System:
The UNT Digital Library
Bankruptcy Reform: The Means Test
This report discusses Means test on Bankruptcy Reform.
Date:
February 18, 2005
Creator:
Jickling, Mark
Object Type:
Report
System:
The UNT Digital Library
Biomolecular Patterning via Photocatalytic Lithography
We have developed a novel method for patterning surface chemistry: Photocatalytic Lithography. This technique relies on inexpensive stamp materials and light; it does not necessitate mass transport or specified substrates, and the wavelength of light should not limit feature resolution. We have demonstrated the utility of this technique through the patterning of proteins, single cells and bacteria.
Date:
February 18, 2005
Creator:
Bearinger, J. P.; Hiddessen, A. L.; Wu, K. J.; Christian, A. T.; Dugan, L. C.; Stone, G. et al.
Object Type:
Article
System:
The UNT Digital Library
Border Security: Streamlined Visas Mantis Program Has Lowered Burden on Foreign Science Students and Scholars, but Further Refinements Needed
A letter report issued by the Government Accountability Office with an abstract that begins "In February 2004, GAO reported that improvements were needed in the time taken to adjudicate visas for science students and scholars. Specifically, a primary tool used to screen these applicants for visas (the Visas Mantis program) was operating inefficiently. We found that it took an average of 67 days to process Mantis checks, and many cases were pending for 60 days or more. GAO also found that the way in which information was shared among agencies prevented cases from being resolved expeditiously. Finally, consular officers lacked sufficient program guidance. This report discusses the time to process Mantis checks and assesses actions taken and timeframes for improving the Mantis program."
Date:
February 18, 2005
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Brady Standard-Herald and Heart O' Texas News (Brady, Tex.), Ed. 1 Friday, February 18, 2005
Semiweekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
February 18, 2005
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Campus-Based Financial Aid Programs: A Review and Analysis of the Allocation of Funds to Institutions and the Distribution of Aid to Students
This report describes and analyzes (a) the process through which federal funds are allocated to institutions under the campus-based programs, (b) the potential for allocating all campus-based funding according to the existing need-based formulas, and (c) the current distribution of aid to students. It will be updated to track legislative proposals addressing the campus-based allocation procedures.
Date:
February 18, 2005
Creator:
Smole, David P.
Object Type:
Report
System:
The UNT Digital Library
The Case for Hydrogen in a Carbon Constrained World
Unlike other fuels, hydrogen (H{sub 2}) can be generated and consumed without generating carbon dioxide (CO{sub 2}). This creates both significant engineering challenges and unsurpassed ecological advantages for H{sub 2} as a fuel, while enabling an inexhaustible (closed) global fuel cycle based on the cleanest, most abundant, natural, and elementary substances: H{sub 2}, O{sub 2}, and H{sub 2}O. If generated using light, heat, and/or electrical energy from solar, wind, fission, or (future) fusion power sources, H{sub 2} becomes a versatile, storable, and universal carbonless energy carrier, a necessary element for future global energy system(s) aimed at being free of air and water pollution, CO{sub 2}, and other greenhouse gases. The case for hydrogen rests fundamentally on the need to eliminate pollution and stabilize Earth's atmosphere and climate system.
Date:
February 18, 2005
Creator:
Berry, G D & Aceves, S M
Object Type:
Article
System:
The UNT Digital Library
Characterization of Bead Trajectories Through the Draft Tube of a Turbine Physical Model.
Using high-speed video imaging, trajectories, and kinematics of beads passing below the turbine runner and through the draft tube region of the 1:25 scale model of a single turbine unit from Bonneville Dam powerhouse 1 were collected from May 6-9, 2003 at U.S. Army Corps of Engineers (USACE) Environmental Research and Development Center (ERDC) in Vicksburg, MS. An individual camera was used to produce 2-dimensional trajectories and paired cameras with overlapping fields of view were used to produce 3-dimension trajectories of near neutrally buoyant beads as they passed through the draft tube region of the turbine model. Image data was collected at two turbine operating levels, lower 1% efficiency and maximum rated output for beads released mid-depth into the turbine intake from each of the three gatewell slots. The purpose of this study was to determine the feasibility of using video imaging to track the trajectories of beads through the draft tube of turbine physical models and from the trajectories calculate the kinematics of the bead trajectory and the beads response to turbulence in the model. This project is part of a research program supported by the U.S. Department of Energy Advanced Hydropower Turbine System Program (AHTS) who's goal is …
Date:
February 18, 2005
Creator:
Weiland, Mark A.; Mueller, Robert P.; Carlson, Thomas J.; Deng, Zhiquan & McKinstry, Craig A.
Object Type:
Report
System:
The UNT Digital Library
Class Actions and Legislative Proposals in the 109th Congress: Class Action Fairness Act of 2005
This report addresses Class Actions and Legislative proposals in the 109th Congress of Class Action Fairness Act of 2005.
Date:
February 18, 2005
Creator:
Wallace, Paul S., Jr.
Object Type:
Report
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 110, No. 7, Ed. 1 Friday, February 18, 2005
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
February 18, 2005
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History