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1,653 Matching Results
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Texas Travel Log, March 2000
Newsletter dedicated to traveling in Texas, including information about news, locations, and events of interest to visitors as well as statistics and summaries of travel in the state.
Date:
March 2000
Creator:
Texas. Department of Transportation.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Veterans Commission Journal, Volume 23, Issue 2, March/April 2000
Magazine for the state agency serving the needs of Texas veterans and their families in matters pertaining to veterans' benefits, rights, education, and employment.
Date:
March 2000
Creator:
Texas Veterans Commission
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
[Thank you letter to Al]
Handwritten thank-you letter to Al for getting a state organization up and running. The front cover has an image of Iris, painted by Vincent van Gogh.
Date:
March 2000
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
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
United Orthodox Synagogues of Houston Bulletin, March 2000
Newsletter of the United Orthodox Synagogues in Houston, including news and events, upcoming services, member announcements, editorials, and other information of interest to congregants.
Date:
March 2000
Creator:
United Orthodox Synagogues of Houston
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
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
Winning, March 2000
Pamphlet containing information about Texas Lottery winners, scratch-off prizes, new games, and more.
Date:
March 2000
Creator:
Texas Lottery Commission
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
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
X-ray and Gamma-ray Spectroscopy of Solids under Pressure
This report describes our recent synchrotrons x-ray absorption fine structure (XAFS) measurements on a number of systems that undergo pressure induced changes in local structure at high pressure. The reader should also refer to the accompanying renewal proposal for a more in-depth discussion of the general scope of this program, and its relevance to condensed matter science. We merely state that the methods here are aimed at using XAFS to probe the various phenomena that are caused by high pressure, especially including various structural, and/or electronic, changes or transitions. Our general technique is based upon a pressure cell which utilizes scintered boron carbide anvils, since diamond anvils generally produce Bragg glitches which spoil the high quality XAFS necessary for precision structural measurements. Sample pressure is determined at the beam-line by measuring and analyzing, via XAFS, the compression of some cubic material contained within the sample chamber. Recently we have extended this work to 77 K using helium gas for the applied force, rather than hydraulic oil. This report period has been productive. The increased flux available at the Stanford Synchrotrons Radiation Laboratory (SSRL) has permitted our going to smaller beams, on the order of 300 pm in diameter, for precision …
Date:
March 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zr and Mo isotopic constraints on the origins of unusual types of presolar SiC grains.
Although most presolar silicon carbide grains form in asymptotic giant branch red giant stars (the so-called mainstream grains) or supernovae (the X-grains), there are a number of other minor types of grains whose origin is less clear. 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], and the isotopic patterns in heavy elements in presolar grains can be used to constrain their origins. We have previously reported that mainstream SiC grains have strong enrichments in the s-process isotopes of Sr, Zr and Mo [2-5] and that X-grains have an unusual Mo isotopic composition that differs from s- and r-process expectations [6,7]. We report here the first measurements of Zr and Mo isotopes in several grains of other rare types that were found in the same mount as the mainstream and X-grains reported previously.
Date:
March 1, 2000
Creator:
Pellin, M. J.; Davis, A. M.; Calaway, W. F.; Lewis, R. S.; Clayton, R. N. & Amari, S.
Object Type:
Article
System:
The UNT Digital Library