UNT Libraries Government Documents Department - 10 Matching Results

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Alignment and micro-inspection system

Description: A video microscope system has been designed and installed in the C-tank, a 3-g, high-explosive firing chamber in HEAF (High Explosives Applications Facility in LLNL). This microscope system helps a great deal, not only for precision alignment of the laser beam on the minute target for the Fabry-Perot velocimeter, but also for in situ inspection of the target before and after the experiment. In addition, the video information can also be stored in the PC computer as database documentati
Date: September 15, 1998
Creator: Chau, H; Hodgin, R L & Moua, K

Application of system simulation for engineering the technical computing environment of the Lawrence Livermore National Laboratorie

Description: This report summarizes an investigation performed by Lawrence Livermore National Laboratory� s (LLNL) Scientific Computing & Communications Department (SCCD) and the Garland Location of Raytheon Systems Company (RSC) from April through August.1998. The study assessed the applicability and benefits of utilizing System Simulation in architecting and deploying technical computing assets at LLNL, particularly in support of the ASCI program and associated scientific computing needs. The recommendations and other reported findings reflect the consensus of the investigation team. The investigation showed that there are potential benefits to performing component level simulation within SCCD in support of the ASCI program. To illustrate this, a modeling exercise was conducted by the study team that generated results consistent with measured operational performance. This activity demonstrated that a relatively modest effort could improve the toolset for making architectural trades and improving levels of understanding for managing operational practices. This capability to evaluate architectural trades was demonstrated by evaluating some of the productivity impacts of changing one of the design parameters of an existing file transfer system. The use of system simulation should be tailored to the local context of resource requirements/limitations, technology plans/processes/issues, design and deployment schedule, and organizational factors. In taking these matters into account, we recommend that simulation modeling be employed within SCCD on a limited basis for targeted engineering studies, and that an overall performance engineering program be established to better equip the Systems Engineering organization to direct future architectural decisions and operational practices. The development of an end-to-end modeling capability and enterprise-level modeling system within SCCD is not warranted in view of the associated development requirements and difficulty in determining firm operational performance requirements in advance of the critical architectural decisions. These recommendations also account for key differences between the programmatic and institutional environments at LLNL and RSC.
Date: September 15, 1998
Creator: Boyd, V; Edmunds, T; Minuzzo, K; Powell, E & Roche, L

Comparison of natural convection heat exchangers for solar water heating systems

Description: Thermosyphon heat exchangers are used in indirect solar water heating systems to avoid using a pump to circulate water from the storage tank to the heat exchanger. In this study, the authors consider the effect of heat exchanger design on system performance. They also compare performance of a system with thermosyphon flow to the same system with a 40W pump in the water loop. In the first part of the study, the authors consider the impact of heat exchanger design on the thermal performance of both one- and two-collector solar water heaters. The comparison is based on Solar Rating and Certification Corporation (SRCC) OG300 simulations. The thermosyphon heat exchangers considered are (1) a one-pass, double wall, 0.22 m{sup 2}, four tube-in-shell heat exchanger manufactured by AAA Service and Supply, Inc., (the Quad-Rod); (2) a two-pass, double wall, 0.2 m{sup 2}, tube-in-shell made by Heliodyne, Inc., but not intended for commercial development; (3) a one-pass, single wall, 0.28 m{sup 2}, 31 tube-in-shell heat exchanger from Young Radiator Company, and (4) a one-pass single-wall, 0.61 m{sup 2}, four coil-in-shell heat exchanger made by ThermoDynamics Ltd. The authors compare performance of the systems with thermosyphon heat exchangers to a system with a 40 W pump used with the Quad-Rod heat exchanger. In the second part of the study, the effects of reducing frictional losses through the heat exchanger and/or the pipes connecting the heat exchanger to the storage tank, and increasing heat transfer area are evaluated in terms of OG300 ratings.
Date: September 15, 1998
Creator: Davidson, J. & Liu, W.

Decontamination of Radionuclides from Concrete During and After Thermal Treatment

Description: The objective was to clarify from the theoretical viewpoint the mechanical, diffusional, thermodynamic and electromagnetic aspects of the decontaminations problem, by means of developing a powerful computational model to evaluate the effect of a very rapid heating regime on the on the contaminated concrete walls or slabs. The practical objective was to assess the feasibility of the microwave heating scheme envisaged and determine its suitable parameters such as power and duration. This objective was complementary to, but separate from, the chemical and nuclear aspects of long-time processes that led to the contamination and various conceivable alternative methods of decontamination which were investigated by Dr. Brian Spalding of Oak Ridge National Laboratory, with whom the start-up phase of this project was coordinated.
Date: September 15, 1998
Creator: Bazant, Z. P.

[Develop mine communications system]. Final technical report

Description: The objective of this project was to develop, design, and build a system prototype to demonstrate the practicality of two-way, wireless through-the-earth communications between the interior of a mine and the surface. The system was to communicate data for process and environment monitoring and control, and provide real-time voice communication for emergency situations and for daily operations use. Transmitters and receivers were designed, built, and tested in actual mines. A wireless in-mine communications system was also developed. The feasibility of the concept and the marketability of the product were successfully demonstrated. Additional work must be done to make the product suitable for, and marketable to, the coal mining industry.
Date: September 15, 1998
Creator: Meiksin, Z.H.

Dickinson Pure Air Combustion ERIP technical progress report number 4 [for the reporting period 7/98 through 9/98]

Description: Research was focused on work done to date and melding with current market conditions and demand. The overall objective of this program is to demonstrate the feasibility of EnerTech`s combustion technology to produce clean energy efficiently and cost effectively from coal and/or other char slurry fuels. From the data generated in this project, EnerTech will be able to conduct preliminary engineering design work for a process development unit. The design work included simulations that optimize process cycle efficiency, and includes analysis of process temperature, pressures, and mass/energy flows. The overall goal is to conduct the research necessary to launch a commercial process. Market surveys indicated that stand-alone systems would not find a near-term market; therefore, the company is concentrating on a configuration that includes a process that first generates a slurry char product.
Date: September 15, 1998
Creator: Klosky, M.

Final Report: Computer Games to Teach Geography: El Nino: Mysteries of the Pacific and Mysteries of the Antarctic, August 15, 1994 - June 20, 1998

Description: During the period covered by this project we have accomplished all the objectives described in our original proposal. The main achievement, however, has been to bring to the commercial market an excellent quality education software product. This highest level of quality has been recognized by the Software Publisher Association, which has awarded its most prestigious appreciation, the Codie Award, for our first product Ocean Expeditions: El Nino. With regards to commercialization, we have developed, as a Phase III project, a comprehensive business plan which we have used to find a publisher/distributor of our products (Tom Snyder Productions) and are presently updating to raise private funding. Also, we have been awarded a 5-year Cooperative Agreement by NASA to continue the development of our products and bring five new products to the education market by the early part of the millennium.
Date: September 15, 1998
Creator: Gautier-Downes, Catherine

Managing America's solid waste

Description: This report presents an historical overview of the federal role in municipal solid waste management from 1965 to approximately 1995. Attention is focuses on the federal role in safeguarding public health, protecting the environment, and wisely using material and energy resources. It is hoped that this report will provide important background for future municipal solid waste research and development initiatives.
Date: September 15, 1998
Creator: Phillips, J. A.

Structure of parallel-velocity-shear driven mode in toroidal plasmas

Description: It is shown that the Fourier-ballooning representation is appropriate for the study of short wavelength drift-like perturbation in toroidal plasmas with a parallel velocity shear (PVS). The radial structure of the mode driven by a PVS is investigated in a torus. The Reynolds stress created by PVS turbulence and proposed as one of the sources for a sheared poloidal plasma rotation is analyzed. It is demonstrated that a finite ion temperature may strongly enhance the Reynolds stress creation ability from PVS driven turbulence. The correlation of this observation with the requirement that ion heating power be higher than a threshold value for the formation of an internal transport barrier is discussed.
Date: September 15, 1998
Creator: Dong, J.Q.; Xu, W.B.; Zhang, Y.Z. & Horton, W.

TAE Saturation of Alpha Particle Driven Instability in TFTR

Description: A nonlinear theory of kinetic instabilities near threshold [H.L. Berk, et al., Plasma Phys. Rep. 23, (1997) 842] is applied to calculate the saturation level of Toroidicity-induced Alfvén Eigenmodes (TAE) and be compared with the predictions of (delta)f method calculations [Y. Chen, Ph.D. Thesis, Princeton University, 1998]. Good agreement is observed between the predictions of both methods and the predicted saturation levels are comparable with experimentally measured amplitudes of the TAE oscillations in TFTR [D.J. Grove and D.M. Meade, Nucl. Fusion 25, (1985) 1167].
Date: September 15, 1998
Creator: Berk, H. L.; Chen, Y.; Gorelenkov, N. N. & White, R. B.