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29,770 Matching Results
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Suppressing Intrinsic Spin Harmonics at the AGS
N/A
Date:
March 1, 2000
Creator:
Lehrach, A.; Courant, E. D.; Glenn, J. W.; Huang, H. & Roser, T.
Object Type:
Report
System:
The UNT Digital Library
Surface modification: advantages, techniques, and applications
Adequate performance of materials at elevated temperatures is a potential problem in many systems within the chemical, petroleum, process, and power-generating industries. Degradation of materials occurs because of interaction between the structural material and the exposure environment. These interactions are generally undesired chemical reactions that can lead to accelerated wastage and alter the functional requirements and/or structural integrity of the materials. Therefore, material selection for high-temperature applications must be based not only on a material strength properties but also on resistance to the complex environments prevalent in the anticipated exposure environment. As plants become larger, the satisfactory performance and reliability of components play a greater role in plant availability and economics. However, system designers are becoming increasingly concerned with finding the least expensive material that will satisfactorily perform the design function for the desired service life. This present paper addresses the benefits of surface modification and identified several criteria for selection and application of modified surfaces in the power sector. A brief review is presented on potential methods for modification of surfaces, with the emphasis on coatings. In the final section of the paper, several examples address the requirements of different energy systems and surface modification avenues that have been …
Date:
March 1, 2000
Creator:
Natesan, K.
Object Type:
Article
System:
The UNT Digital Library
Surfactant-modified diffusion on transition-metal surfaces (reprinted with the addition of the appendices)
Wanting to convert surface impurities from a nuisance to a systematically applicable nano-fabrication tool, the authors have sought to understand how such impurities affect self-diffusion on transition-metal surfaces. Their field-ion microscope experiments reveal that in the presence of surface hydrogen, self-diffusion on Rh(100) is promoted, while on Pt(100), not only is it inhibited, but its mechanism changes. First-principles calculations aimed at learning how oxygen fosters perfect layerwise growth on a growing Pt(111) crystal contradict the idea in the literature that it does so by directly promoting transport over Pt island boundaries. The discovery that its real effect is to burn off adventitious adsorbed carbon monoxide demonstrates the predictive value of state-of-the-art calculation methods.
Date:
March 1, 2000
Creator:
Feibelman, Peter J. & Kellogg, Gary Lee
Object Type:
Report
System:
The UNT Digital Library
Synthesis and Characterization of Nanowires
With the dimensions of components in microelectronic circuits shrinking, the phenomena associated with electronic conduction through wires and with device operation can be expected to change. For example, as the length of electrical conductors is reduced, ballistic transport will become the main mode of conduction. Sufficient reduction in the cross sectional area of conductors can lead to quantum confinement effects. Prior knowledge of the phenomena associated with decreasing size should help guide the designers of future, smaller devices in terms of geometry and materials. However, prior knowledge requires the availability of sufficiently small nanowires for experiments. To date, the smallest nanowires that have been fabricated and investigated had diameters of 8 nm. We propose to extend the investigation of these size-related phenomena by synthesizing, using a novel version of nuclear, or ion, track lithography and characterizing, physically and electrically, nanowires with diameters D of 1 to 5 nm and lengths L of 2 to 250 nm. Thus, by varying the dimensions of the nanowires, we will be able to determine experimentally when the ideas of macroscopic conductance break down and the conductance becomes dominated by quantum and ballistic effects. In our approach the nature of the small-diameter nanostructure formed can …
Date:
March 1, 2000
Creator:
Musket, R.G.; Felter, T. & Quong, A.
Object Type:
Report
System:
The UNT Digital Library
The Taiwan Security Enhancement Act and Underlying Issues in U.S. Policy
None
Date:
March 1, 2000
Creator:
Dumbaugh, Kerry
Object Type:
Report
System:
The UNT Digital Library
Test Plan for Measuring Ventilation Rates and Combustible Gas Levels in TWRS Active Catch Tanks
The purpose of this data collection activity is to obtain data for a screening of combustible gases in catch tanks that are currently operated by the River Protection Project (RPP). The results will be used to support closure of the flammable gas unreviewed safety question for these facilities. The data collection will be conducted in accordance with the ''Tank Safety Screening Data Quality Objective'' (Dukelow et al. 1995). Combustible gas, ammonia, and organic vapor levels in the headspace of the catch tanks will be field-measured using hand-held instruments. If a combustible gas level measurement in a tank exceeds an established threshold, vapor grab samples (i.e., Hoke and SUMMA) will be collected for laboratory analysis. In addition, ventilation rates of some catch tanks will be determine using the tracer gas injection method to evaluate removal of flammable gas by air flowing through the tanks. This test plan identifies the field tests, sample collection, laboratory analysis, quality assurance, and reporting objectives for this data collection effort. The plan also provides step-by-step direction for field measurement of combustible gas concentrations and determination of ventilation rates.
Date:
March 1, 2000
Creator:
NGUYEN, D.M.
Object Type:
Report
System:
The UNT Digital Library
Test Problems for Reactive Flow HE Model in the ALE3D Code and Limited Sensitivity Study
We document quick running test problems for a reactive flow model of HE initiation incorporated into ALE3D. A quarter percent change in projectile velocity changes the outcome from detonation to HE burn that dies down. We study the sensitivity of calculated HE behavior to several parameters of practical interest where modeling HE initiation with ALE3D.
Date:
March 1, 2000
Creator:
Gerassimenko, M.
Object Type:
Report
System:
The UNT Digital Library
Texas Attorney General Opinion: JC-188
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, John Cornyn, regarding a legal question submitted for clarification: Whether a state agency may require an employee to exhaust compensatory leave before receiving workers’ compensation benefits (RQ-0119-JC)
Date:
March 1, 2000
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Attorney General Opinion: JC-189
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, John Cornyn, regarding a legal question submitted for clarification: Whether the Texas Department of Transportation is authorized to establish the Statewide Transportation Policy Committee and the Bicycle Advisory Committee as provided in title 43, section 1.85(a)(2) and (8) of the Texas Administrative Code (RQ-0126-JC)
Date:
March 1, 2000
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Attorney General Opinion: JC-190
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, John Cornyn, regarding a legal question submitted for clarification: Whether funds allocated by section 1701.157 of the Occupations Code to local law enforcement agencies for continuing education of local law enforcement officers may be diverted to the general fund of a county or municipality (RQ-0125-JC)
Date:
March 1, 2000
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
A theoretical description of inhomogeneous turbulence
This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). In this LDRD, we have developed a highly compact and descriptive formalism that allows us to broach the theoretically formidable morass of inhomogeneous turbulence. Our formalism has two novel aspects: (a) an adaptation of helicity basis functions to represent an arbitrary incompressible channel flow and (b) the invocation of a hypothesis of random phase. A result of this compact formalism is that the mathematical description of inhomogeneous turbulence looks much like that of homogeneous turbulence--at the moment, the most rigorously explored terrain in turbulence research. As a result, we can explore the effect of boundaries on such important quantities as the gradients of mean flow, mean pressure, triple-velocity correlations and pressure velocity correlations, all of which vanish under the conventional, but artificial, assumption that the turbulence is statistically spatially uniform. Under suitable conditions, we have predicted that a mean flow gradient can develop even when none is initially present.
Date:
March 1, 2000
Creator:
Turner, L.
Object Type:
Report
System:
The UNT Digital Library
Thickness effects on the plastic collapse of perforated plates with triangular penetration patterns
This paper investigates the effects of plate thickness on the accuracy of limit load solutions obtained using an elastic-perfectly plastic [EPP] equivalent solid [EQS] procedure for flat perforated plates with a triangular array of penetrations. The EQS approach for limit loads is based on an EQS collapse surface that is valid for generalized plane strain. This assumption is applicable for very thick plates but is known to be less reasonable for very thin plates where plane stress may be a better assumption. The limits of applicability of the generalized plane strain assumption are investigated by obtaining limit load solutions for perforated plates of various thicknesses that are subjected to in-plane and bending loads. Plastic limit load solutions obtained using three-dimensional EPP finite element analysis [FEA] of models which include each penetration explicitly are compared with solutions obtained using the EQS approximation. The penetration pattern chosen for this study has a ligament efficiency (ligament width-to-pitch ratio, h/P) of 0.32. For plates thicker than the pitch, the limit load calculated using the EQS method for both in-plane and bending loads is shown to be very accurate (within 4%) of the limit load calculated for the explicit model. On the other hand, for …
Date:
March 1, 2000
Creator:
Gordon, J.L.; Jones, D.P. & Holliday, J.E.
Object Type:
Article
System:
The UNT Digital Library
Toward complete isotopic analysis of individual presolar silicon carbide grains : C, N, Si, Sr, Zr, Mo, and Ba in single grains of type X.
Presolar silicon carbide grains form in a variety of types of stars, including asymptotic giant branch red giant stars and supernovae. The dominant mechanisms of heavy element nucleosynthesis, the s-process and r-process, are thought to occur mainly in AGB stars and supernovae, respectively [1]. We have previously reported that mainstream SiC grains have strong enrichments in the s-process isotopes of Sr, Zr and Mo [2-4] and initial results for X-type SiC grains showing enrichments in the r-process isotopes of Mo[5]. We report here the first measurements of Zr, Sr, and Ba isotopes along with expanded studies of Mo in individual X-type SiC grains, which have previously been identified as having formed from supernova ejects.
Date:
March 1, 2000
Creator:
Pellin, M. J.; Calaway, W. F.; Davis, A. M.; Lewis, R. S.; Amari, S. & Clayton, R. N.
Object Type:
Article
System:
The UNT Digital Library
The Town Tattler (Electra, Tex.), Ed. 1 Wednesday, March 1, 2000
Monthly newspaper from Electra, Texas that includes local and regional news along with advertising.
Date:
March 1, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
UMCP-BG and E collaboration in nuclear power engineering in the framework of DOE-Utility Nuclear Power Engineering Education Matching Grant Program
The DOE-Utility Nuclear Power Engineering Education Matching Grant Program has been established to support the education of students in Nuclear Engineering Programs to maintain a knowledgeable workforce in the United States in order to keep nuclear power as a viable component in a mix of energy sources for the country. The involvement of the utility industry ensures that this grant program satisfies the needs and requirements of local nuclear energy producers and at the same time establishes a strong linkage between education and day-to-day nuclear power generation. As of 1997, seventeen pairs of university-utility partners existed. UMCP was never a member of that group of universities, but applied for the first time with a proposal to Baltimore Gas and Electric Company in January 1999 [1]. This proposal was generously granted by BG&E [2,3] in the form of a gift in the amount of $25,000 from BG&E's Corporate Contribution Program. Upon the arrival of a newly appointed Director of Administration in the Department of Materials and Nuclear Engineering, the BG&E check was deposited into the University's Maryland Foundation Fund. The receipt of the letter and the check enabled UMCP to apply for DOE's matching funds in the same amount by a …
Date:
March 1, 2000
Creator:
Wolfe, Lothar PhD
Object Type:
Report
System:
The UNT Digital Library
A UNIVERSAL LAW FOR TAILS OF DENSITY PDF'S IN MULTI-DIMENSIONAL BURGERS TURBULENCE
None
Date:
March 1, 2000
Creator:
Bec, J. & Frisch, U.
Object Type:
Article
System:
The UNT Digital Library
University Press (Beaumont, Tex.), Vol. 76, No. 36, Ed. 1 Wednesday, March 1, 2000
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
March 1, 2000
Creator:
Bordeman, Christina
Object Type:
Newspaper
System:
The Portal to Texas History
Upgrading Natural Gas via Membrane Separation Processes
The objective of the present study is to assess the potential usefulness of membrane separation processes for removing CO{sub 2} and H{sub 2}S from low-quality natural gas containing substantial amounts of both these ''acid'' gases, e.g., up to 40 mole-% CO{sub 2} and 10 mole-% H{sub 2}S. The membrane processes must be capable of upgrading the crude natural gas to pipeline specifications ({le} 2 mole-% CO{sub 2}, {le} 4 ppm H{sub 2}S). Moreover, these processes must also be economically competitive with the conventional separation techniques, such as gas absorption, utilized for this purpose by the gas industry.
Date:
March 1, 2000
Creator:
S.A.Stern; Rice, P.A. & Hao, J.
Object Type:
Report
System:
The UNT Digital Library
The use of carbon fibers in wind turbine blade design: A SERI-8 blade example
The benefit of introducing carbon fibers in a wind turbine blade was evaluated. The SERI-8 wind turbine blade was used as a baseline for study. A model of the blade strength and stiffness properties was created using the 3D-Beam code; the predicted geometry and structural properties were validated against available data and static test results. Different enhanced models, which represent different volumes of carbon fibers in the blade, were also studied for two design options: with and without bend-twist coupling. Studies indicate that hybrid blades have excellent structural properties compared to the all-glass SERI-8 blade. Recurring fabrication costs were also included in the study. The cost study highlights the importance of the labor-cost to material-cost ratio in the cost benefits and penalties of fabrication of a hybrid glass and carbon blade.
Date:
March 1, 2000
Creator:
Ong, Cheng-Huat & Tsai, Stephen W.
Object Type:
Report
System:
The UNT Digital Library
Věstník (Temple, Tex.), Vol. 88, No. 9, Ed. 1 Wednesday, March 1, 2000
Weekly Czech and English language newspaper from Temple, Texas published as the official organ of the Slavonic Benevolent Order of the State of Texas that includes news of interest to members along with advertising.
Date:
March 1, 2000
Creator:
Vanicek, Brian
Object Type:
Newspaper
System:
The Portal to Texas History
Vitrified magnesia dissolution and its impact on plutonium residue processing
Aqueous chloride operations at the Los Alamos Plutonium Facility cannot directly dispose of acidic waste solutions because of compatibility problems with existing disposal lines. Consequently, all hydrochloric acid must be neutralized and filtered prior to exiting the facility. From a waste minimization standpoint, the use of spent magnesia pyrochemical crucibles as the acid neutralization agent is attractive since this process would take a stream destined for transuranic waste and use it as a reagent in routine plutonium residue processing. Since Los Alamos National Laboratory has several years of experience using magnesium hydroxide as a neutralizing agent for waste acid from plutonium processing activities, the use of spent magnesia pyrochemical crucibles appeared to be an attractive extension of this activity. In order to be competitive with magnesium hydroxide, however, size reduction of crucible shards had to be performed effectively within the constraints of glovebox operations, and acid neutralization time using crucible shards had to be comparable to neutralization times observed when using reagent-grade magnesium hydroxide. The study utilized non-plutonium-contaminated crucibles for equipment evaluation and selection and used nonradioactive acid solutions for completing the neutralization experiments. This paper discusses experience in defining appropriate size reduction equipment and presents results from using the …
Date:
March 1, 2000
Creator:
Fife, Keith W.; Alwin, Jennifer L.; Smith, Coleman A.; Mayne, Michael D. & Rockstraw, David A.
Object Type:
Report
System:
The UNT Digital Library
Weak proton capture on {sup 3}He
The astrophysical S-factor for the proton weak capture on {sup 3}He is calculated with correlated-hyperspherical-harmonics bound and continuum wave functions corresponding to realistic Hamiltonians consisting of the Argonne {upsilon}{sub 14} or Argonne {upsilon}{sub 18} two-nucleon and Urbana-VIII or Urbana-IX three-nucleon interactions. The nuclear weak charge and current operators have vector and axial-vector components, that include one- and many-body terms. All possible multipole transitions connecting any of the p {sup 3}He S- and P-wave channels to the {sup 4}He bound state are considered. The S-factor at a p {sup 3}He center-of-mass energy of 10 keV, close to the Gamow-peak energy, is predicted to be 10.1 x 10{sup {minus}20} keV b with the AV18/UIX Hamiltonian, a factor of about 4.5 larger than the value adopted in the standard solar model. The P-wave transitions are found to be important, contributing about 40% of the calculated S-factor. The energy dependence is rather weak: the AV18/UIX zero-energy S-factor is 9.64 x 10{sup {minus}20} keV b, only 5% smaller than the 10 keV result quoted above. The model dependence is also found to be weak: the zero-energy S-factor is calculated to be 10.2 x 10{sup {minus}20} keV b with the older AV14/UVIII model, only 6% larger …
Date:
March 1, 2000
Creator:
Marcucci, L. E.; Schiavilla, R.; Viviani, M.; Kievsky, A.; Rosati, S. & Beacom, J. F.
Object Type:
Article
System:
The UNT Digital Library
Wind turbine design codes: A comparison of the structural response
The National Wind Technology Center (NWTC) of the National Renewable Energy Laboratory is continuing a comparison of several computer codes used in the design and analysis of wind turbines. The second part of this comparison determined how well the programs predict the structural response of wind turbines. In this paper, the authors compare the structural response for four programs: ADAMS, BLADED, FAST{_}AD, and YawDyn. ADAMS is a commercial, multibody-dynamics code from Mechanical Dynamics, Inc. BLADED is a commercial, performance and structural-response code from Garrad Hassan and Partners Limited. FAST{_}AD is a structural-response code developed by Oregon State University and the University of Utah for the NWTC. YawDyn is a structural-response code developed by the University of Utah for the NWTC. ADAMS, FAST{_}AD, and YawDyn use the University of Utah's AeroDyn subroutine package for calculating aerodynamic forces. Although errors were found in all the codes during this study, once they were fixed, the codes agreed surprisingly well for most of the cases and configurations that were evaluated. One unresolved discrepancy between BLADED and the AeroDyn-based codes was when there was blade and/or teeter motion in addition to a large yaw error.
Date:
March 1, 2000
Creator:
Buhl, M. L. Jr.; Wright, A. D. & Pierce, K. G.
Object Type:
Article
System:
The UNT Digital Library
The Wylie News (Wylie, Tex.), Vol. 53, No. 40, Ed. 1 Wednesday, March 1, 2000
Weekly newspaper from Wylie, Texas that includes local, state and national news along with advertising.
Date:
March 1, 2000
Creator:
Engbrock, Chad B.
Object Type:
Newspaper
System:
The Portal to Texas History