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729 Matching Results
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Gas Storage Technology Consortium
Gas storage is a critical element in the natural gas industry. Producers, transmission and distribution companies, marketers, and end users all benefit directly from the load balancing function of storage. The unbundling process has fundamentally changed the way storage is used and valued. As an unbundled service, the value of storage is being recovered at rates that reflect its value. Moreover, the marketplace has differentiated between various types of storage services, and has increasingly rewarded flexibility, safety, and reliability. The size of the natural gas market has increased and is projected to continue to increase towards 30 trillion cubic feet (TCF) over the next 10 to 15 years. Much of this increase is projected to come from electric generation, particularly peaking units. Gas storage, particularly the flexible services that are most suited to electric loads, is critical in meeting the needs of these new markets. In order to address the gas storage needs of the natural gas industry, an industry-driven consortium was created--the Gas Storage Technology Consortium (GSTC). The objective of the GSTC is to provide a means to accomplish industry-driven research and development designed to enhance operational flexibility and deliverability of the Nation's gas storage system, and provide a …
Date:
May 10, 2006
Creator:
Morrison, Joel L. & Elder, Sharon L.
Object Type:
Report
System:
The UNT Digital Library
The use of bulk states to accelerate the band edge statecalculation of a semiconductor quantum dot
We present a new technique to accelerate the convergence of the folded spectrum method in empirical pseudopotential band edge state calculations for colloidal quantum dots. We use bulk band states of the materials constituent of the quantum dot to construct initial vectors and a preconditioner. We apply these to accelerate the convergence of the folded spectrum method for the interior states at the top of the valence and the bottom of the conduction band. For large CdSe quantum dots, the number of iteration steps until convergence decreases by about a factor of 4 compared to previous calculations.
Date:
May 10, 2006
Creator:
Vomel, Christof; Tomov, Stanimire Z.; Wang, Lin-Wang; Marques,Osni A. & Dongarra, Jack J.
Object Type:
Article
System:
The UNT Digital Library
MODIFIED BOROHYDRIDES FOR REVERSIBLE HYDROGEN STORAGE
This paper reports the results in the effort to destabilize lithium borohydride for reversible hydrogen storage. A number of metals, metal hydrides, metal chlorides and complex hydrides were selected and evaluated as the destabilization agents for reducing dehydriding temperature and generating dehydriding-rehydriding reversibility. It is found that some additives are effective. The Raman spectroscopic analysis shows the change of B-H binding nature.
Date:
May 10, 2006
Creator:
Au, Ming
Object Type:
Article
System:
The UNT Digital Library
Bottom-up, decision support system development : a wetlandsalinity management application in California's San Joaquin Valley
Seasonally managed wetlands in the Grasslands Basin ofCalifornia's San Joaquin Valley provide food and shelter for migratorywildfowl during winter months and sport for waterfowl hunters during theannual duck season. Surface water supply to these wetland contain saltwhich, when drained to the San Joaquin River during the annual drawdownperiod, negatively impacts downstream agricultural riparian waterdiverters. Recent environmental regulation, limiting discharges salinityto the San Joaquin River and primarily targeting agricultural non-pointsources, now addresses return flows from seasonally managed wetlands.Real-time water quality management has been advocated as a means ofmatching wetland return flows to the assimilative capacity of the SanJoaquin River. Past attempts to build environmental monitoring anddecision support systems to implement this concept have failed forreasons that are discussed in this paper. These reasons are discussed inthe context of more general challenges facing the successfulimplementation of environmental monitoring, modelling and decisionsupport systems. The paper then provides details of a current researchand development project which will ultimately provide wetland managerswith the means of matching salt exports with the available assimilativecapacity of the San Joaquin River, when fully implemented. Manipulationof the traditional wetland drawdown comes at a potential cost to thesustainability of optimal wetland moist soil plant habitat in thesewetlands - hence the project …
Date:
May 10, 2006
Creator:
Quinn, Nigel W.T.
Object Type:
Article
System:
The UNT Digital Library
THRESHOLD RESUMMATION FOR HIGGS PRODUCTION IN EFFECTIVE FIELD THEORY.
None
Date:
May 10, 2006
Creator:
YUAN, F.
Object Type:
Article
System:
The UNT Digital Library
A POTENTIAL APPLICATION OF UNCERTAINTY ANALYSIS TO DOE-STD-3009-94 ACCIDENT ANALYSIS
The objective of this paper is to assess proposed transuranic waste accident analysis guidance and recent software improvements in a Windows-OS version of MACCS2 that allows the inputting of parameter uncertainty. With this guidance and code capability, there is the potential to perform a quantitative uncertainty assessment of unmitigated accident releases with respect to the 25 rem Evaluation Guideline (EG) of DOE-STD-3009-94 CN3 (STD-3009). Historically, the classification of safety systems in a U.S. Department of Energy (DOE) nuclear facility's safety basis has involved how subject matter experts qualitatively view uncertainty in the STD-3009 Appendix A accident analysis methodology. Specifically, whether consequence uncertainty could be larger than previously evaluated so the site-specific accident consequences may challenge the EG. This paper assesses whether a potential uncertainty capability for MACCS2 could provide a stronger technical basis as to when the consequences from a design basis accident (DBA) truly challenges the 25 rem EG.
Date:
May 10, 2007
Creator:
Palmrose, D. E. & Yang, J. M.
Object Type:
Article
System:
The UNT Digital Library
Multiple-code benchmark simulation study of coupled THMC processesin the excavation disturbed zone associated with geological nuclear wasterepositories
An international, multiple-code benchmark test (BMT) studyis being conducted within the international DECOVALEX project to analysecoupled thermal, hydrological, mechanical and chemical (THMC) processesin the excavation disturbed zone (EDZ) around emplacement drifts of anuclear waste repository. This BMT focuses on mechanical responses andlong-term chemo-mechanical effects that may lead to changes in mechanicaland hydrological properties in the EDZ. This includes time-de-pendentprocesses such as creep, and subcritical crack, or healing of fracturesthat might cause "weakening" or "hardening" of the rock over the longterm. Five research teams are studying this BMT using a wide range ofmodel approaches, including boundary element, finite element, and finitedifference, particle mechanics, and elasto-plastic cellular automatamethods. This paper describes the definition of the problem andpreliminary simulation results for the initial model inception part, inwhich time dependent effects are not yet included.
Date:
May 10, 2006
Creator:
Rutqvist, J.; Feng, X. T.; Hudson, J.; Jing, L.; Kobayashi, A.; Koyama, T. et al.
Object Type:
Article
System:
The UNT Digital Library
Solid Target Studies for Muon Colliders And Neutrino Beams
This paper presents preliminary results from an ongoing post-irradiation analysis of materials that have been irradiated at the Brookhaven National Laboratory (BNL) Isotope facility. The effort is part of an experimental study that focuses on how prone to irradiation damage these materials are and thus what is their potential in playing the role of high power targets in the neutrino superbeam and the muon collider initiatives.
Date:
May 10, 2006
Creator:
Simos, N.; Kirk, H.; Ludewig, H.; Thieberger, P.; Weng, W. T.; Trung, P. T. et al.
Object Type:
Article
System:
The UNT Digital Library
A MEASUREMENT OF THE POSITIVE pi- Mu DECAY LIFETIME
The lifetime for the decay of a {pi} meson into {mu} meson and neutral particle was first measured by Richardson and later by Martinelli and Panofsky. The method was the same in both cases: The fraction of {pi} mesons surviving various times of flight is measured by placing photographic detectors at various path lengths from the target. In the experiment reported here we observe the time lag between the two bursts of fluorescence due to mesons decaying in a scintillation crystal. The first burst is due to the stopping of the entering {pi} meson, the second to the {mu}-meson. As is shown in Fig. 1, a particle penetrating the first and into the second crystal starts the sweep (10{sup -8} sec/mm) of an oscilloscope. The pulses in the second crystal are delayed 0.5 x 10{sup -6} sec to allow the sweep to start and brighten and are then photographed. If the responsible particle is a {pi}{sup +} meson which stops in the crystal, it undergoes {pi}-{mu} decay and two pulses appear on the trace. The {mu}{sup +} meson has a range of only 2 mm in the crystal. If its decay electron is detected some time (.5-2.5 x 10{sup -6} …
Date:
May 10, 1950
Creator:
Chamberlain, O.; Mozely, R.F.; Steinberger, J. & Wiegand, C.
Object Type:
Report
System:
The UNT Digital Library
Systematic Evaluation of Jc Decrease in Thick Film Coated Conductors
Address both thickness dependence of Jc, in thick film YBCO coated conductors through an application of a suite of new measurement techniques to thick film wire samples produced by commercially viable coated conductor technologies.
Date:
May 10, 2006
Creator:
Ignatiev, Alex & Goyal, Dr. Amit
Object Type:
Report
System:
The UNT Digital Library
Facility Modernization Report
Modern and technologically up-to-date facilities and systems infrastructure are necessary to accommodate today's research environment. In response, Lawrence Livermore National Laboratory (LLNL) has a continuing commitment to develop and apply effective management models and processes to maintain, modernize, and upgrade its facilities to meet the science and technology mission. The Facility Modernization Pilot Study identifies major subsystems of facilities that are either technically or functionally obsolete, lack adequate capacity and/or capability, or need to be modernized or upgraded to sustain current operations and program mission. This study highlights areas that need improvement, system interdependencies, and how these systems/subsystems operate and function as a total productive unit. Although buildings are 'grandfathered' in and are not required to meet current codes unless there are major upgrades, this study also evaluates compliance with 'current' building, electrical, and other codes. This study also provides an evaluation of the condition and overall general appearance of the structure.
Date:
May 10, 2007
Creator:
Robinson, D & Ackley, R
Object Type:
Report
System:
The UNT Digital Library
Spatial distribution of average charge state and deposition rate in high power impulse magnetron sputtering of copper
The spatial distribution of copper ions and atoms in high power impulse magnetron sputtering (HIPIMS) discharges was determined by (i) measuring the ion current to electrostatic probes and (ii) measuring the film thickness by profilometry. A set of electrostatic and collection probes were placed at different angular positions and distances from the target surface. The angular distribution of the deposition rate and the average charge state of the copper species (including ions and neutrals) were deduced.The discharge showed a distinct transition to a high current mode dominated by copper self-sputtering when the applied voltage exceeded the threshold of 535 V. For a lower voltage, the deposition rate was very low and the average charge state was found to be less than 0.4. For higher voltage (and average power), the absolute deposition rates were much higher, but they were smaller than the corresponding direct current (DC) rates if normalized to the same average power. At the high voltage level, the spatial distribution of the average charge state showed some similarities with the distribution of the magnetic field, suggesting that the generation and motion of copper ions is affected by magnetized electrons. At higher voltage, the average charge state increases with the …
Date:
May 10, 2008
Creator:
Anders, Andre; Horwat, David & Anders, Andre
Object Type:
Article
System:
The UNT Digital Library
Comparative simulation study of coupled THM processes nearback-filled and open-drift nuclear waste repositories in Task D of theInternational DECOVALEX Project
As part of the ongoing international DECOVALEX project, fourresearch teams used five different models to simulate coupled thermal,hydrological, and mechanical (THM) processes near underground wasteemplacement drifts. The simulations were conducted for two genericrepository types, one with open and the other with back-filled repositorydrifts, under higher and lower post-closure temperature, respectively. Inthe completed first model inception phase of the project, a goodagreement was achieved between the research teams in calculating THMresponses for both repository types, although some disagreement inhydrological responses are currently being resolved. Good agreement inthe basic thermal-mechanical responses was also achieved for bothrepository types, even though some teams used relatively simplifiedthermal-elastic heat-conduction models that neglect complex near-fieldthermal-hydrological processes. The good agreement between the complexand simplified process models indicates that the basic thermal-mechanicalresponses can be predicted with a relatively high confidencelevel.
Date:
May 10, 2006
Creator:
Rutqvist, J.; Birkholzer, J.T.; Chijimatsu, M.; Kolditz, O.; Liu,Quan-Sheng; Oda, Y. et al.
Object Type:
Article
System:
The UNT Digital Library
Office of Advanced Scientific Computing Research Applied Mathematics Principal Program Annual PI Meeting Abstracts
None
Date:
May 10, 2007
Creator:
Diachin, L
Object Type:
Article
System:
The UNT Digital Library
Antifriction-Bearing.
Patent for certain new and useful improvements in antifriction bearings for " the ends of the hub and means for eluding dust fro the bearings" (line 11 -13).
Date:
May 10, 1898
Creator:
Hobron, Charles B.
Object Type:
Patent
System:
The Portal to Texas History
Automatic Vehicle - Brake.
Patent for a new and improved automatic vehicle brake.
Date:
May 10, 1898
Creator:
Elliott, Joseph Samuel
Object Type:
Patent
System:
The Portal to Texas History
Automatic Bench Clamp And Dog.
Patent for a new and useful automatic bench clamp and dog.
Date:
May 10, 1898
Creator:
Rogers, James P.
Object Type:
Patent
System:
The Portal to Texas History
Combination Claw and Pinch Bar
Patent for a combination claw and pinch bar that is adapted for use with railway tracks. Illustrations included.
Date:
May 10, 1910
Creator:
Clarke, Marcus S. & Adreon, Edward L.
Object Type:
Patent
System:
The Portal to Texas History
Cotton, Berry, or Vegetable Picking or Dairy Stool
Patent for a stool strapped to the user so as to facilitate an ease in picking cotton, berry, or vegetables. Illustration included.
Date:
May 10, 1904
Creator:
Farley, John C. & Prince, Hyman
Object Type:
Patent
System:
The Portal to Texas History
Clothes Line
Patent for a clothes line. Illustration included.
Date:
May 10, 1904
Creator:
Owens, Solon Arther
Object Type:
Patent
System:
The Portal to Texas History
Churn-Dash.
Patent for new improvements to a churn dash, including two concentric rings joined by inclined wings with accompanying illustrations.
Date:
May 10, 1898
Creator:
Renfro, John R., Jr.
Object Type:
Patent
System:
The Portal to Texas History
Axle-Repairing Apparatus.
Patent for a new, simple, and efficient axle repairing apparatus for "facilitating the repairing of worn axles without the removal of the wheels or the axles from the vehicle-body" (line 10 -12).
Date:
May 10, 1898
Creator:
Hammer, Willie Alice
Object Type:
Patent
System:
The Portal to Texas History
GAMIDEN: a program to aid in the identification of unknown materials by gamma-ray spectroscopy
The intent of the computer code GAMIDEN is to help identify isotopes by their gamma-ray emissions and thus to assist in the nondestructive assay of unknown materials. From both radioactive decays and neutron captures, GAMIDEN searches GAMTOT83, a file of gamma-ray spectra, for matches with observed photon energies. This report describes the search procedure, outlines the use of the code, and gives an example. The code is designed to operate on the CRAY 1 computer at Lawrence Livermore National Laboratory (LLNL). It is written in standard Fortran (ANSI) for the most part but contains some LRLTRAN instructions to make use of the Livermore time-sharing system (LTSS). The code uses about 545,000 words of memory. Typical problems run in about 45 s. The source program and the data file are available on request.
Date:
May 10, 1983
Creator:
Howerton, Robert J.
Object Type:
Report
System:
The UNT Digital Library
Waste management analysis for the nuclear fuel cycle. II. Recycle preparation for wastewater streams
Recycle preparation methods were evaluated for secondary aqueous waste streams likely to be produced during reactor fuel fabrication and reprocessing. Adsorption, reverse osmosis, and ozonization methods were evaluated on a laboratory scale for their application to the treatment of wastewater. Activated carbon, macroreticular resins, and polyurethanes were tested to determine their relative capabilities for removing detergents and corrosive anions from wastewater. Conceptual flow sheets were constructed for purifying wastewater by reverse osmosis. In addition, the application of ozonization techniques for water recycle preparation was examined briefly.
Date:
May 10, 1979
Creator:
Smith, C.M.; Navratil, J.D. & Plock, C.E.
Object Type:
Report
System:
The UNT Digital Library