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The Harper Herald (Harper, Tex.), Vol. 70, No. 17, Ed. 1 Tuesday, April 25, 2000
Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.
Date:
April 25, 2000
Creator:
Bishop, Karen
Object Type:
Newspaper
System:
The Portal to Texas History
Hydrostatic Mooring System
This report is a summary of the following topics of the first quarter of 2000: (1) Han Padron Associates (HPA) provided conceptual structural design of the mooring buoy; and (2) they completed partial review of the HPA design and designed the sealing elements.
Date:
April 25, 2000
Creator:
Jens Korsgaard
Object Type:
Report
System:
The UNT Digital Library
IRIS Program. Second quarterly report
None
Date:
April 25, 2000
Creator:
Carelli, M. D.
Object Type:
Report
System:
The UNT Digital Library
Medical Records Confidentiality
None
Date:
April 25, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Minimum-time control of systems with Coloumb friction: Near global optima via mixed integer linear programming
This work presents a method of finding near global optima to minimum-time trajectory generation problem for systems that would be linear if it were not for the presence of Coloumb friction. The required final state of the system is assumed to be maintainable by the system, and the input bounds are assumed to be large enough so that they can overcome the maximum static Coloumb friction force. Other than the previous work for generating minimum-time trajectories for non redundant robotic manipulators for which the path in joint space is already specified, this work represents, to the best of the authors' knowledge, the first approach for generating near global optima for minimum-time problems involving a nonlinear class of dynamic systems. The reason the optima generated are near global optima instead of exactly global optima is due to a discrete-time approximation of the system (which is usually used anyway to simulate such a system numerically). The method closely resembles previous methods for generating minimum-time trajectories for linear systems, where the core operation is the solution of a Phase I linear programming problem. For the nonlinear systems considered herein, the core operation is instead the solution of a mixed integer linear programming problem.
Date:
April 25, 2000
Creator:
Driessen, Brian & Sadegh, Nader
Object Type:
Article
System:
The UNT Digital Library
Model-Based Nonrigid Motion Analysis Using Natural Feature Adaptive Mesh
The success of nonrigid motion analysis using physical finite element model is dependent on the mesh that characterizes the object's geometric structure. We suggest a deformable mesh adapted to the natural features of images. The adaptive mesh requires much fewer number of nodes than the fixed mesh which was used in our previous work. We demonstrate the higher efficiency of the adaptive mesh in the context of estimating burn scar elasticity relative to normal skin elasticity using the observed 2D image sequence. Our results show that the scar assessment method based on the physical model using natural feature adaptive mesh can be applied to images which do not have artificial markers.
Date:
April 25, 2000
Creator:
Zhang, Y.; Goldgof, D.B.; Sarkar, S. & Tsap, L.V.
Object Type:
Article
System:
The UNT Digital Library
Modeling of transient ionizing radiation effects in bipolar devices at high dose-rates
To optimally design circuits for operation at high intensities of ionizing radiation, and to accurately predict their a behavior under radiation, precise device models are needed that include both stationary and dynamic effects of such radiation. Depending on the type and intensity of the ionizing radiation, different degradation mechanisms, such as photoelectric effect, total dose effect, or single even upset might be dominant. In this paper, the authors consider the photoelectric effect associated with the generation of electron-hole pairs in the semiconductor. The effects of low radiation intensity on p-II diodes and bipolar junction transistors (BJTs) were described by low-injection theory in the classical paper by Wirth and Rogers. However, in BJTs compatible with modem integrated circuit technology, high-resistivity regions are often used to enhance device performance, either as a substrate or as an epitaxial layer such as the low-doped n-type collector region of the device. Using low-injection theory, the transient response of epitaxial BJTs was discussed by Florian et al., who mainly concentrated on the effects of the Hi-Lo (high doping - low doping) epilayer/substrate junction of the collector, and on geometrical effects of realistic devices. For devices with highly resistive regions, the assumption of low-level injection is often …
Date:
April 25, 2000
Creator:
Fjeldly, T. A.; Deng, Y.; Shur, M. S.; Hjalmarson, Harold P. & Muyshondt, Arnoldo
Object Type:
Article
System:
The UNT Digital Library
New capabilities in the HENP grand challenge storage access systemand its application at RHIC
The High Energy and Nuclear Physics Data Access GrandChallenge project has developed an optimizing storage access softwaresystem that was prototyped at RHIC. It is currently undergoingintegration with the STAR experiment in preparation for data taking thatstarts in mid-2000. The behavior and lessons learned in the RHIC MockData Challenge exercises are described as well as the observedperformance under conditions designed to characterize scalability. Up to250 simultaneous queries were tested and up to 10 million events across 7event components were involved in these queries. The system coordinatesthe staging of "bundles" of files from the HPSS tape system, so that allthe needed components of each event are in disk cache when accessed bythe application software. The caching policy algorithm for thecoordinated bundle staging is described in the paper. The initialprototype implementation interfaced to the Objectivity/DB. In this latestversion, it evolved to work with arbitrary files and use CORBA interfacesto the tag database and file catalog services. The interface to the tagdatabase and the MySQL-based file catalog services used by STAR aredescribed along with the planned usage scenarios.
Date:
April 25, 2000
Creator:
Bernardo, L.; Gibbard, B.; Malon, D.; Nordberg, H.; Olson, D.; Porter, R. et al.
Object Type:
Article
System:
The UNT Digital Library
A note on the transition from coupled plasticity and damage to decohesion in the evolution of solder failure
A key issue of solder joint reliability is joint failure due to thermomechanical fatigue (TMF). TMF is caused by different coefficients of thermal expansion (CTEs) of the materials in an electronic package, combined with changes in the ambient temperature. Different CTEs result in cyclical strain in the assembly, and this strain is concentrated almost entirely in the solder because it is the most deformable portion of the package. Since solder alloy is at a significant fraction of its melting point even at room temperature, the cyclical strain enhances mass diffusion and causes dramatic changes in the alloy microstructure over time. As the microstructure changes and becomes coarser, the solder alloy weakens and eventually microcracks nucleate and grow in the joint, leading to component failure. the failure of solder joints is difficult to detect due to the inert nature of the electrical system. If the system is not on for extended periods then failures can not be observed. Therefore it is important to develop an advanced predictive capability which allows scientists and engineers to predict solder degradation and identify reliability problems in aging electronics early.
Date:
April 25, 2000
Creator:
Chen, Zhen & Fang, Huei Eliot
Object Type:
Article
System:
The UNT Digital Library
Nuclear Safety: Concerns With the Continuing Operation of Soviet-Designed Nuclear Power Reactors
A chapter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on Soviet-designed nuclear power reactors, focusing on: (1) how much money has been spent by the United States and other countries for assistance to improve the safety of Soviet-designed nuclear power reactors--and the types of assistance being provided--as well as planned U.S. expenditures; (2) experts' views on the impact of the assistance; (3) the status of efforts to close high-risk Soviet-designed reactors; and (4) the management of the Department of Energy's (DOE) and the Nuclear Regulatory Commission's (NRC) safety assistance activities."
Date:
April 25, 2000
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 84, No. 150, Ed. 1 Tuesday, April 25, 2000
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 25, 2000
Creator:
Wilmoth, Adam
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
On the Effects of Migration on the Fitness Distribution of Parallel Evolutionary Algorithms
Migration of individuals between populations may increase the selection pressure. This has the desirable consequence of speeding up convergence, but it may result in an excessively rapid loss of variation that may cause the search to fail. This paper investigates the effects of migration on the distribution of fitness. It considers arbitrary migration rates and topologies with different number of neighbors, and it compares algorithms that are configured to have the same selection intensity. The results suggest that migration preserves more diversity as the number of neighbors of a deme increases.
Date:
April 25, 2000
Creator:
Cantu-Paz, E.
Object Type:
Article
System:
The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 107, No. 82, Ed. 1 Tuesday, April 25, 2000
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 25, 2000
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Power Line Damage, Electrical Outages Reduced in the ''Sleet Belt'': NICE3 Steel Project Fact Sheet
The AR Windamper System was developed through a grant from the Inventions and Innovation Program, to protect power transmission lines in sleet belt states and provinces by eliminating the ''galloping'' phenomenon. Wind damping products minimize power outages and reduce repair costs to transmission lines.
Date:
April 25, 2000
Creator:
unknown
Object Type:
Book
System:
The UNT Digital Library
Prompt Photon Production in Polarized Hadron Collisions.
We consider spin asymmetries for prompt photon production in collisions of longitudinally polarized hadrons. This reaction will be a key tool at the BNL-RHIC {rvec p}{rvec p} collider for determining the gluon spin density in a polarized proton. We study the effects of QCD corrections, such as all-order soft-gluon ''threshold'' resummations.
Date:
April 25, 2000
Creator:
Vogelsang, W.
Object Type:
Article
System:
The UNT Digital Library
QCD AT HIGH PARTON DENSITY
The authors derive an equation determining the small-x evolution of the F{sub 2} structure function of a large nucleus which resumes a cascade of gluons in the leading logarithmic approximation using Mueller's color dipole model. In the traditional language it corresponds to resummation of the pomeron fan diagrams, originally conjectured in the GLR equation. The authors show that the solution of the equation describes the physics of structure functions at high partonic densities, thus allowing them to gain some understanding of the most interesting and challenging phenomena in small-x physics--saturation.
Date:
April 25, 2000
Creator:
KOVCHEGOV,Y.V.
Object Type:
Article
System:
The UNT Digital Library
Rains County Leader (Emory, Tex.), Vol. 112, No. 45, Ed. 1 Tuesday, April 25, 2000
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
April 25, 2000
Creator:
Hill, Earl Clyde, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
Reexamination of spent fuel shipment risk estimates
The risks associated with the transport of spent nuclear fuel by truck and rail have been reexamined and compared to results published in NUREG-O170 and the Modal Study. The full reexamination considered transport of PWR and BWR spent fuel by truck and rail in four generic Type B spent fuel casks. Because they are typical, this paper presents results only for transport of PWR spent fuel in steel-lead steel casks. Cask and spent fuel response to collision impacts and fires were evaluated by performing three-dimensional finite element and one-dimensional heat transport calculations. Accident release fractions were developed by critical review of literature data. Accident severity fractions were developed from Modal Study truck and rail accident event trees, modified to reflect the frequency of occurrence of hard and soft rock wayside route surfaces as determined by analysis of geographic data. Incident-free population doses and the population dose risks associated with the accidents that might occur during transport were calculated using the RADTRAN 5 transportation risk code. The calculated incident-free doses were compared to those published in NUREG-O170. The calculated accident dose risks were compared to dose risks calculated using NUREG-0170 and Modal Study accident source terms. The comparisons demonstrated that both …
Date:
April 25, 2000
Creator:
Cook, J. R. & Sprung, Jeremy L.
Object Type:
Article
System:
The UNT Digital Library
The Religious Liberty Protection Act: Background and Current Status
None
Date:
April 25, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 84, No. 192, Ed. 1 Tuesday, April 25, 2000
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 25, 2000
Creator:
Quinnelly, Lorrie J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
SBA Loan Monitoring System: Substantial Progress Yet Key Risks and Challenges Remain
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the Small Business Administration's (SBA) progress in performing planning actions for its loan monitoring system."
Date:
April 25, 2000
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Scalable rendering on PC clusters
This case study presents initial results from research targeted at the development of cost-effective scalable visualization and rendering technologies. The implementations of two 3D graphics libraries based on the popular sort-last and sort-middle parallel rendering techniques are discussed. An important goal of these implementations is to provide scalable rendering capability for extremely large datasets (>> 5 million polygons). Applications can use these libraries for either run-time visualization, by linking to an existing parallel simulation, or for traditional post-processing by linking to an interactive display program. The use of parallel, hardware-accelerated rendering on commodity hardware is leveraged to achieve high performance. Current performance results show that, using current hardware (a small 16-node cluster), they can utilize up to 85% of the aggregate graphics performance and achieve rendering rates in excess of 20 million polygons/second using OpenGL{reg_sign} with lighting, Gouraud shading, and individually specified triangles (not t-stripped).
Date:
April 25, 2000
Creator:
Wylie, Brian N.; Lewis, Vasily; Shirley, David Noyes & Pavlakos, Constantine
Object Type:
Article
System:
The UNT Digital Library
Scope of Work for Integration Management and Installation Services of the National Ignition Facility Beampath Infrastructure System
The goal of the National Ignition Facility (NIF) project is to provide an aboveground experimental capability for maintaining nuclear competence and weapons effects simulation and to provide a facility capable of achieving fusion ignition using solid-state lasers as the energy driver. The facility will incorporate 192 laser beams, which will be focused onto a small target located at the center of a spherical target chamber--the energy from the laser beams will be deposited in a few billionths of a second. The target will then implode, forcing atomic nuclei to sufficiently high temperatures and densities necessary to achieve a miniature fusion reaction. The NIF is under construction, at Livermore, California, located approximately 50 miles southeast of San Francisco, California.
Date:
April 25, 2000
Creator:
Coyle, P.D.
Object Type:
Report
System:
The UNT Digital Library
Screening Analysis for EPACT-Covered Commercial HVAC and Water-Heating Equipment
The Energy Policy and Conservation Act (EPCA) as amended by the Energy Policy Act of 1992 (EPACT) establishes that the U.S. Department of Energy (DOE) regulate efficiency levels of certain categories of commercial heating, cooling, and water-heating equip-ment. EPACT establishes the initial minimum efficiency levels for products falling under these categories, based on ASHRAE/IES Standard 90.1-1989 requirements. EPCA states that, if ASHRAE amends Standard 90.1-1989 efficiency levels, then DOE must establish an amended uniform national manufacturing standard at the minimum level specified in the amended Standard 90.1 and that it can establish higher efficiency levels if they would result in significant additional energy savings. Standard 90.1-1999 increases minimum efficiency levels for some of the equipment categories covered by EPCA 92. DOE conducted a screening analysis to determine the energy-savings potential for EPACT-covered products meet and exceeding these levels. This paper describes the methodology, data assumptions, and results of the analysis.
Date:
April 25, 2000
Creator:
Somasundaram, Sriram; Armstrong, Peter R.; Belzer, David B.; Gaines, Suzanne C.; Hadley, Donald L.; Katipumula, S. et al.
Object Type:
Report
System:
The UNT Digital Library