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1,026 Matching Results
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EBW-Bootstrap Current Synergy in the National Spherical Torus Experiment (NSTX)
Current driven by electron Bernstein waves (EBW) and by the electron bootstrap effect are calculated separately and concurrently with a kinetic code, to determine the degree of synergy between them. A target {beta} = 40% NSTX plasma is examined. A simple bootstrap model in the CQL3D Fokker-Planck code is used in these studies: the transiting electron distributions are connected in velocity-space at the trapped-passing boundary to trapped-electron distributions which are displaced radially by a half-banana width outwards/inwards for the co-/counter-passing regions. This model agrees well with standard bootstrap current calculations, over the outer 60% of the plasma radius. Relatively small synergy net bootstrap current is obtained for EBW power up to 4 MW. Locally, bootstrap current density increases in proportion to increased plasma pressure, and this effect can significantly affect the radial profile of driven current.
Date:
February 2, 2005
Creator:
Harvey, R.W. & Taylor, G.
Object Type:
Report
System:
The UNT Digital Library
Efficient Coupling of Thermal Electron Bernstein Waves to the Ordinary Electromagnetic Mode on the National Spherical Torus Experiment (NSTX)
Efficient coupling of thermal electron Bernstein waves (EBW) to ordinary mode (Omode) electromagnetic radiation has been measured in plasmas heated by energetic neutral beams and high harmonic fast waves in the National Spherical Torus Experiment (NSTX) [M. Ono, S. Kaye, M. Peng, et al., Proceedings 17th IAEA Fusion Energy Conference (IAEA, Vienna, Austria, 1999), Vol.3, p. 1135]. The EBW to electromagnetic mode coupling efficiency was measured to be 0.8 {+-} 0.2, compared to a numerical EBW modeling prediction of 0.65. The observation of efficient EBW coupling to O-mode, in relatively good agreement with numerical modeling, is a necessary prerequisite for implementing a proposed high power EBW current drive system on NSTX.
Date:
February 2, 2005
Creator:
Taylor, G.; Efthimion, P. C.; LeBlanc, B. P.; Carter, M. D.; Caughman, J. B.; Wilgen, J. B. et al.
Object Type:
Report
System:
The UNT Digital Library
Efficient Numerical Modeling of Truncation Effects and Defects in Finite Periodic Structures
There is a keen interest in using periodic structures to model such structures as phased arrays, frequency selective surfaces, and metamaterials. Recent interest has focused on modeling the truncation effects of periodic structures. The GIFFT (Green's function Interpolation using Fast Fourier Transform) method has recently been proposed as an efficient integral equation approach for handling moderate-to-large structures with essentially arbitrary (but identical) elements within each cell. The method uses an array mask--a listing of whether or not an element of the periodic structure is present at each potential cell location within the structure's bounding box--to simplify the handling of arbitrary array boundaries and missing elements. The interaction between adjacent cells is treated using the method of moments in its usual form,but periodicity reduces the number of distinct near-interactions over the entire structure to a 3 x 3 block matrix. (The inverse of this block or even of its central block serves as an effective preconditioner.) The calculation of interactions between non-adjacent cells relies on the following features: (1) For cell sizes less than a few wavelengths, the Green's function is sufficiently smooth that it may be interpolated accurately over both source and observation points within interacting cell pairs via equispaced …
Date:
February 2, 2005
Creator:
Fasenfest, B J; Basilio, L; Wilton, D & Capolino, F
Object Type:
Article
System:
The UNT Digital Library
Electroweak physics: measurement of w gamma and z gamma production in pp-bar collisions at s**(1/2) = 1.96 tev
The Standard Model predictions for W{gamma} and Z{gamma} production are tested using an integrated luminosity of 200 pb{sup -1} of p{bar p} collision data collected at the Collider Detector at Fermilab. The cross sections are measured by selecting leptonic decays of the W and Z bosons, and photons with transverse energy E{sub T} > 7 GeV that are well separated from leptons. The production cross sections and kinematic distributions for the W{gamma} and Z{gamma} data are compared to SM predictions.
Date:
February 2, 2005
Creator:
Acosta, D.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of Sorbent Injection for Mercury Control
The power industry in the U.S. is faced with meeting new regulations to reduce the emissions of mercury compounds from coal-fired plants. These regulations are directed at the existing fleet of nearly 1,100 boilers. These plants are relatively old with an average age of over 40 years. Although most of these units are capable of operating for many additional years, there is a desire to minimize large capital expenditures because of the reduced (and unknown) remaining life of the plant to amortize the project. Injecting a sorbent such as powdered activated carbon into the flue gas represents one of the simplest and most mature approaches to controlling mercury emissions from coal-fired boilers. The overall objective of the test program described in this quarterly report is to evaluate the capabilities of activated carbon injection at five plants with configurations that together represent 78% of the existing coal-fired generation plants. This technology was successfully evaluated in NETL's Phase I tests at scales up to 150 MW, on plants burning subbituminous and bituminous coals and with ESPs and fabric filters. The tests also identified issues that still need to be addressed, such as evaluating performance on other configurations, optimizing sorbent usage (costs), and …
Date:
February 2, 2005
Creator:
Sjostrom, Sharon
Object Type:
Report
System:
The UNT Digital Library
Executive Branch Continuity of Operations (COOP): An Overview
None
Date:
February 2, 2005
Creator:
Petersen, R. Eric
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, February 2, 2005
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 2, 2005
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
A Fast MoM Solver (GIFFT) for Large Arrays of Microstrip and Cavity-Backed Antennas
A straightforward numerical analysis of large arrays of arbitrary contour (and possibly missing elements) requires large memory storage and long computation times. Several techniques are currently under development to reduce this cost. One such technique is the GIFFT (Green's function interpolation and FFT) method discussed here that belongs to the class of fast solvers for large structures. This method uses a modification of the standard AIM approach [1] that takes into account the reusability properties of matrices that arise from identical array elements. If the array consists of planar conducting bodies, the array elements are meshed using standard subdomain basis functions, such as the RWG basis. The Green's function is then projected onto a sparse regular grid of separable interpolating polynomials. This grid can then be used in a 2D or 3D FFT to accelerate the matrix-vector product used in an iterative solver [2]. The method has been proven to greatly reduce solve time by speeding up the matrix-vector product computation. The GIFFT approach also reduces fill time and memory requirements, since only the near element interactions need to be calculated exactly. The present work extends GIFFT to layered material Green's functions and multiregion interactions via slots in ground planes. …
Date:
February 2, 2005
Creator:
Fasenfest, B J; Capolino, F & Wilton, D
Object Type:
Article
System:
The UNT Digital Library
Federal Recess Judges
This report discusses the recess clause and takes a look at the history of recess appointments. Under Article II of the Constitution, the President is empowered "to fill up all Vacancies that may happen during the Recess of the Senate, by granting Commissions which shall expire at the End of their next Session." Presidents have used the recess appointment power on more than 300 occasions to place judges on the district, appellate, and U.S. Supreme Court level. This practice slowed after the 1950s, but recent recess appointments to federal appellate courts (the Fourth, Fifth, and Eleventh Circuits) have revived a number of constitutional issues.
Date:
February 2, 2005
Creator:
Fisher, Louis
Object Type:
Report
System:
The UNT Digital Library
Federal Research and Development Funding: FY2005
This report discusses federal research and development (R&D) funding for FY2005. The Bush Administration requested $131.9 billion in R&D funding for FY2005. This was $5.9 billion above the estimated $126 billion that was appropriated for federal R&D in FY2004.
Date:
February 2, 2005
Creator:
Davey, Michael E.
Object Type:
Report
System:
The UNT Digital Library
Femtosecond, High-Brightness Electron Beam Generation and Advanced Diagnosis
This document serves as the final report for LDRD project number 04-LW-031, in which we created subpicosecond length, kilo-amp peak current electron beams with the 100 MeV electron/positron linac, using a novel technique designed to produce ultra-short bunch lengths while maintaining the high brightness produced by the S-band photoinjector. In addition, a diagnostic to measure the temporal distribution of the beam was investigated, as conventional pulse length measurement techniques do not apply to extremely short pulses. The creation and diagnosis of beams with both femtosecond length and high transverse brightness is of major concern to next generation acceleration and radiation production experiments. This work leveraged the previous investment in the PLEIADES facility and it's ability to produce high brightness electron beams. In addition, the ultra-short electron pulses generated by this work have been used in conjunction with the PLEIADES X-ray source to produce sub-picosecond, high-brightness X-ray pulses.
Date:
February 2, 2005
Creator:
Anderson, S G; Brown, W J; Tremaine, A M; Kuba, J; Hartemann, F V & Fittinghoff, D N
Object Type:
Report
System:
The UNT Digital Library
Finite Temperature Quasicontinuum: Molecular Dynamics without all the Atoms
Using a combination of statistical mechanics and finite-element interpolation, the authors develop a coarse-grained (CG) alternative to molecular dynamics (MD) for crystalline solids at constant temperature. The new approach is significantly more efficient than MD and generalizes earlier work on the quasi-continuum method. The method is validated by recovering equilibrium properties of single crystal Ni as a function of temperature. CG dynamical simulations of nanoindentation reveal a strong dependence on temperature of the critical stress to nucleate dislocations under the indenter.
Date:
February 2, 2005
Creator:
Dupuy, L; Tadmor, E B; Miller, R E & Phillips, R
Object Type:
Article
System:
The UNT Digital Library
Genomics-based selection and functional characterization of triterpene glycosyltransferases from the model legume Medicago truncatula
Article on genomics-based selection and functional characterization of triterpene glycosyltransferases from the model legume Medicago truncatula.
Date:
February 2, 2005
Creator:
Achnine, Lahoucine; Huhman, David; Farag, Mohamed A.; Sumner, Lloyd W.; Blount, Jack W. & Dixon, R. A.
Object Type:
Article
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 109, No. 30, Ed. 1 Wednesday, February 2, 2005
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
February 2, 2005
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Dallas, Tex.), Vol. 28, No. 279, Ed. 1 Wednesday, February 2, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
February 2, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 35, No. 562, Ed. 1 Wednesday, February 2, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
February 2, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 35, No. 563, Ed. 1 Wednesday, February 2, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
February 2, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 35, No. 564, Ed. 1 Wednesday, February 2, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
February 2, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Homeland Security: Final Regulations on Classification, Pay, and Performance Management Compared with Current Law
This report compares the final regulations with current law under Title 5 of the United States Code and relevant regulations under Title 5 of the Code of Federal Regulations.
Date:
February 2, 2005
Creator:
Schwemle, Barbara L.
Object Type:
Report
System:
The UNT Digital Library
Homeland Security: Management of First Responder Grant Programs Has Improved, but Challenges Remain
A letter report issued by the Government Accountability Office with an abstract that begins "The Office for Domestic Preparedness (ODP)--originally established in 1998 within the Department of Justice to help state and local first responders acquire specialized training and equipment needed to respond to terrorist incidents--was transferred to the Department of Homeland Security upon its creation in March 2003. After September 11, 2001, the scope and size of ODP's grant programs expanded. For example, from fiscal year 2001 through fiscal year 2003, ODP grants awarded to states and some urban areas grew from about $91 million to about $2.7 billion. This growth raised questions about the ability of ODP and states to ensure that the domestic preparedness grant programs--including statewide and urban area grants--are managed effectively and efficiently. GAO addressed (1) how statewide and urban area grants were administered in fiscal years 2002 and 2003 so that ODP could ensure that grant funds were spent in accordance with grant guidance and state preparedness planning and (2) what time frames Congress and ODP established for awarding and distributing grants, and how time frames affected the grant cycle."
Date:
February 2, 2005
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
A Human Reliability-Centered Approach to the Development of Job Aids for Reviewers of Medical Devices That Use Radiological Byproduct Materials.
The U.S. Nuclear Regulatory Commission (NRC) is engaged in an initiative to risk-inform the regulation of byproduct materials. Operating experience indicates that human actions play a dominant role in most of the activities involving byproduct materials, which are radioactive materials other than those used in nuclear power plants or in weapons production, primarily for medical or industrial purposes. The overall risk of these activities is strongly influenced by human performance. Hence, an improved understanding of human error, its causes and contexts, and human reliability analysis (HRA) is important in risk-informing the regulation of these activities. The development of the human performance job aids was undertaken by stages, with frequent interaction with the prospective users. First, potentially risk significant human actions were identified based on reviews of available risk studies for byproduct material applications and of descriptions of events for byproduct materials applications that involved potentially significant human actions. Applications from the medical and the industrial domains were sampled. Next, the specific needs of the expected users of the human performance-related capabilities were determined. To do this, NRC headquarters and region staff were interviewed to identify the types of activities (e.g., license reviews, inspections, event assessments) that need HRA support and …
Date:
February 2, 2005
Creator:
Cooper, S. E.; Brown, W. S. & Wreathall, J.
Object Type:
Article
System:
The UNT Digital Library
Immigration: Analysis of the Major Provisions of H.R. 418, the REAL ID Act of 2005
This report describes relevant current law relating to immigration and document-security matters, how H.R. 418 would alter current law if enacted, and the degree to which the bill duplicates existing law.
Date:
February 2, 2005
Creator:
Garcia, Michael J.; Lee, Margaret M. & Tatelman, Todd B.
Object Type:
Report
System:
The UNT Digital Library
Israel’s Proposal to Withdraw from Gaza
None
Date:
February 2, 2005
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Knowledge Representation Issues in Semantic Graphs for Relationship Detection
An important task for Homeland Security is the prediction of threat vulnerabilities, such as through the detection of relationships between seemingly disjoint entities. A structure used for this task is a ''semantic graph'', also known as a ''relational data graph'' or an ''attributed relational graph''. These graphs encode relationships as typed links between a pair of typed nodes. Indeed, semantic graphs are very similar to semantic networks used in AI. The node and link types are related through an ontology graph (also known as a schema). Furthermore, each node has a set of attributes associated with it (e.g., ''age'' may be an attribute of a node of type ''person''). Unfortunately, the selection of types and attributes for both nodes and links depends on human expertise and is somewhat subjective and even arbitrary. This subjectiveness introduces biases into any algorithm that operates on semantic graphs. Here, we raise some knowledge representation issues for semantic graphs and provide some possible solutions using recently developed ideas in the field of complex networks. In particular, we use the concept of transitivity to evaluate the relevance of individual links in the semantic graph for detecting relationships. We also propose new statistical measures for semantic graphs …
Date:
February 2, 2005
Creator:
Barthelemy, M; Chow, E & Eliassi-Rad, T
Object Type:
Article
System:
The UNT Digital Library