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7,402 Matching Results
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Quadric solids and computational geometry
As part of the CAD-CAM development project, this report discusses the mathematics underlying the program QUADRIC, which does computations on objects modeled as Boolean combinations of quadric half-spaces. Topics considered include projective space, quadric surfaces, polars, affine transformations, the construction of solids, shaded image, the inertia tensor, moments, volume, surface integrals, Monte Carlo integration, and stratified sampling. 1 figure.
Date:
July 25, 1980
Creator:
Emery, J.D.
Object Type:
Report
System:
The UNT Digital Library
Numerical simulation of the stability in a cable-in-conduit conductor developed for fusion-magnet applications
The stability margins of the US-Demonstration Poloidal Coil (US-DPC) and the International Thermonuclear Experimental Reactor (ITER) TF coils have been modeled numerically using the computer program CICC. The computed US-DPC limiting current, I{sub lim}, compares favorably with the values determined experimentally. Using the detailed program CICC output, we investigated the DPC quench initiation mechanism in each of the three stability regions. In the ill-cooled region, the imposed heat pulse heats the conductor to the current-sharing temperature, T{sub cs}. In the transition region, the resistance heating after the pulse must be strong enough to overcome the induced flow reversal. In the well-cooled region, good heat transfer heats the helium during the pulse. After the pulse, these high helium temperatures along with poor heat transfer cause the conductor to quench. Changes in I{sub lim} agree with Dresner's relationship. I{sub lim} can be improved by decreasing the copper resistivity, the helium fraction, or the conductor diameter. Preliminary results show the ITER and TF coil operating point is in the well-cooled region. 10 refs., 7 figs., 1 tab.
Date:
September 25, 1991
Creator:
Wong, R.L.; Shen, S.S. (Lawrence Livermore National Lab., CA (United States)); Yeaw, C.T. (Wisconsin Univ., Madison, WI (United States)) & Miller, J.R. (National High Magnetic Field Laboratory, Florida State University (USA))
Object Type:
Article
System:
The UNT Digital Library
Time-dependent properties of fiber composites for energy-storage flywheels
Time-dependent deformation and time-dependent strength are being characterized for several candidate polymeric composites for flywheels. This presentation highlights the motivation and the philosophy of the characterization adopted by the authors in establishing the ongoing programs at LLL. This overview is intended to provide a basis for inferring the type of enginering data being generated for different aspects of flywheel design. The details of these data can be obtained from the published reports and articles. Two aspects of flywheel design data are addressed: those dealing with time-dependent statistical strength, and those dealing with deformation and strength under time-varying history.
Date:
October 25, 1977
Creator:
Wu, E.M. & Penn, L.S.
Object Type:
Article
System:
The UNT Digital Library
Tritium experience at RTNS-II
Neutrons are produced at the Rotating Target Neutron Source-II (RTNS-II) by deuteron bombardment of a rotating tritium target. Tritium is released from these targets into the accelerator vacuum system. The vacuum system exhaust is first scrubbed and then vented via the facility stack. Tritium emission from the facility in normal operation with vacuum system exhaust flowing through the scrubber is extremely low, <1 mCi/day. Releases from by-passing the tritium scrubber during roughing of the vacuum system and from accelerator maintenance account for nearly all of the annual 10 Ci release from the facility. Routine target changes have been the cause of most tritium uptake by personnel. A target shipping system has been devised for transport of these targets.
Date:
April 25, 1980
Creator:
Logan, C. M.; Davis, J. C.; Gibson, T. A.; Heikkinen, D. W.; Schumacher, B. J. & Singh, M. S.
Object Type:
Article
System:
The UNT Digital Library
Production of muons for fusion catalysis in a magnetic mirror configuration. Revision 1
For muon-catalyzed fusion to be of practical interest, a very efficient means of producing muons must be found. We describe a scheme for producing muons that may be more energy efficient than any heretofore proposed. There are, in particular, some potential advantages of creating muons from collisions of high energy tritons confined in a magnetic mirror configuration. If one could catalyze 200 fusions per muon and employ a uranium blanket that would multiply the neutron energy by a factor of 10, one might produce electricity with an overall plant efficiency (ratio of electric energy produced to nuclear energy released) approaching 30%. One possible near term application of a muon-producing magnetic-mirror scheme would be to build a high-flux neutron source for radiation damage studies. The careful arrangement of triton orbits will result in many of the ..pi../sup -/'s being produced near the axis of the magnetic mirror. The pions quickly decay into muons, which are transported into a small (few-cm-diameter) reactor chamber producing approximately 1-MW/m/sup 2/ neutron flux on the chamber walls, using a laboratory accelerator and magnetic mirror. The costs of construction and operation of the triton injection accelerator probably introduces most of the uncertainty in the viability of this …
Date:
July 25, 1986
Creator:
Moir, R.W. & Chapline, G.F. Jr.
Object Type:
Article
System:
The UNT Digital Library
Supernovae, compact stars and nuclear physics
We briefly review the current understanding of supernova. We investigate the implications of rapid rotation corresponding to the frequency of the new pulsar reported in the supernovae remnant SN1987A. It places very stringent conditions on the equation of state if the star is assumed to be bound by gravity alone. We find that the central energy density of the star must be greater than 12 times that of nuclear density to be stable against the most optimistic estimate of general relativistic instabilities. This is too high for the matter to plausibly consist of individual hadrons. We conclude that the newly discovered pulsar, if its half-millisecond signals are attributable to rotation, cannot be a neutron star. We show that it can be a strange quark star, and that the entire family of strange stars can sustain high rotation under appropriate conditions. We discuss the conversion of a neutron star to strange star, the possible existence of a crust of heavy ions held in suspension by centrifugal and electric forces, the cooling and other features. 39 refs., 8 figs., 2 tabs.
Date:
August 25, 1989
Creator:
Glendenning, N.K.
Object Type:
Article
System:
The UNT Digital Library
Current drive and heating systems for an ITER HARD option
A conceptual design has been developed for a reference current drive and heating system for a HARD (High Aspect Ratio Design) option for ITER. Twelve neutral beam modules, each rated at 1.3MeV and 9.2MW, perform plasma heating and current drive. An electron cyclotron system is used for initiating the plasma and for disruption control. An alternate system has been defined which is comprised of a lower hybrid and ion cyclotron system for heating and current drive, augmented by the same electron cyclotron system proposed for the reference system. 7 refs., 8 figs., 1 tab.
Date:
September 25, 1991
Creator:
Lindquist, W.; Bulmer, R.; Fenstermacher, M.; Nevins, W.; Parker, J.; Smith, G. et al.
Object Type:
Article
System:
The UNT Digital Library
New tools using the hardware performance monitor to help users tune programs on the Cray X-MP
The performance of a Cray system is highly dependent on the tuning techniques used by individuals on their codes. Many of our users were not taking advantage of the tuning tools that allow them to monitor their own programs by using the Hardware Performance Monitor (HPM). We therefore modified UNICOS to collect HPM data for all processes and to report Mflop ratings based on users, programs, and time used. Our tuning efforts are now being focused on the users and programs that have the best potential for performance improvements. These modifications and some of the more striking performance improvements are described.
Date:
September 25, 1991
Creator:
Engert, D. E.; Rudsinski, L. (Argonne National Lab., IL (United States)) & Doak, J. (Cray Research, Inc., Minneapolis, MN (United States))
Object Type:
Article
System:
The UNT Digital Library
Mission analysis and performance specification studies report. Appendix A. [LYFECC and WANDC]
The results of Task I, mission analysis and performance specifications, for the Near-Term Hybrid Vehicle (NTHV) development program are presented. The items researched included trip characteristics, market potential, life-cycle cost and performance specifications of NTHV's. (LCL)
Date:
January 25, 1979
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
An Evaluation of the Krieger-Nelkin Method From Calculations of Slow Neutron Scattering by CH$sub 4$
None
Date:
August 25, 1961
Creator:
McMurry, H. L.; Griffing, G. W.; Hestir, W. A. & Gannon, L. J.
Object Type:
Report
System:
The UNT Digital Library
SPE water electrolysis technology development for large scale hydrogen production. Progress report No. 6, January 1, 1977--March 31, 1977
The status of the following studies is reported: low cost current collector development, high temperature operation, catalytic electrode development, low cost polymer development, evaluation of the effect of hydrogen enrichment on older gas pipelines, cell and SPE optimization, cell assembly design, stack assembly design, manufacturing process development, and system analysis and definition.
Date:
April 25, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Proposed geothermal sampler design
None
Date:
November 25, 1974
Creator:
Calder, C.A.; Lord, S.C. & Davis, D.D.
Object Type:
Report
System:
The UNT Digital Library
Staff management of security personnel at Martin Marietta Energy Systems, Inc. , Portsmouth Gaseous Diffusion Plant
The Portsmouth Gaseous Diffusion Plant Security and Police Operations Department is responsible for protecting the US Department of Energy interests at the Portsmouth Plant from theft, sabotage, and other hostile acts that may adversely affect national security, the public health and safety, or property at the Department of Energy facility. This audit's purpose was to evaluate Martin Marietta Energy Systems, Inc.'s staff management at the Portsmouth Plant Security Department. The Portsmouth Plant Security Department could reduce operating cost up to an estimated $4.4 million over 5 years by: (1) Eliminating up to 14 unnecessary staff positions, and (2) reducing the length of relief breaks. These economies could be realized through implementing written operating procedures and negotiating removal of certain labor union restrictions. 2 tabs.
Date:
September 25, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Flood Safety of the Mixed Spectrum Superheater
Calculations are presented which show that the reactivity effect of flooding and unflooding the fast superheating section of the Mixed Spectrum Superheater can be made small by the addition of epithermal poisons to the superheater. The reactivity effects of flooding superheater sections ranging in size from 1.25 to 3.5 ft cubes and containing U/sup 23/5/sup >/oxide or Pu/sup 239/ oxide fuel and various amounts o f the epithermal poison europium were calculated. Reactivity changes during several postulated flooding processes are given. Methods for deterthination of fissile and fertile material and poison cross sections in the resonance- region are discussed. (auth)
Date:
May 25, 1961
Creator:
Reynolds, A. B.
Object Type:
Report
System:
The UNT Digital Library
Mirror theory applied to toroidal systems
Central features of a mirror plasma are strong departures from Maxwellian distribution functions, ambipolar potentials and densities which vary along a field line, and losses, and the mirror field itself. To examine these features, mirror theorists have developed analytical and numerical techniques to solve the Fokker-Planck equation, evaluate the potentials consistent with the resulting distribution functions, and assess the microstability of these distributions. Various combinations of mirror-plasma fetures are present and important in toroidal plasmas as well, particularly in the edge region and in plasmas with strong r.f. heating. In this paper we survey problems in toroidal plasmas where mirror theory and computational techniques are applicable, and discuss in more detail three specific examples: calculation of the toroidal generalization of the Spitzer-Haerm distribution function (from which trapped-particle effects on current drive can be calculated), evaluation of the nonuniform potential and density set up by pulsed electron-cyclotron heating, and calculation of steady-state distribution functions in the presence of strong r.f. heating and collisions. 37 refs., 3 figs.
Date:
August 25, 1987
Creator:
Cohen, R.H.
Object Type:
Article
System:
The UNT Digital Library
Development of an 8 kW wind turbine generator for residential type applications. Phase I: design and analysis. Volume II. Technical report
This Phase I summary report contains a description of the 8 kW wind energy conversion system developed by the United Technologies Research Center (UTRC) for the Department of Energy. The wind turbine employs the UTRC Bearingless Rotor Concept in conjunction with a passive pendulum control system which controls blade pitch for start-up, efficient power generation, and high-speed survivability. The report contains a summary of the experimental and analytical programs in support of design efforts. These supporting programs include materials tests, a wind tunnel program, and aeroelastic analyses to evaluate system stability. An estimate is also made of the projected manufacturing cost of the system if produced in quantity.
Date:
June 25, 1979
Creator:
Cheney, M C
Object Type:
Report
System:
The UNT Digital Library
CdSiAs/sub 2/ thin films for solar cell applications. First quarter report April 9, 1979-June 30, 1979
Near stoichiometric bulk polycrystalline CdSiAs/sub 2/ has been synthesized by two techniques: (1) direct fusion of the elements and (2) direct fusion of the binaries SiAs, Cd/sub 3/As/sub 2/ and CdAs/sub 2/. The latter technique resulted in denser ternary material with good homogeneity. The above binaries melt congruently and were also formed by direct fusion. Sputtered ternary films were formed using a bulk CdSiAs/sub 2/ target, and a composite target of CdAs/sub 2/ discs in a Si plate. Composition of the CdSiAS/sub 2/ target changed with sputtering time. Amorphous films deposited from that target were heat treated, and became crystalline and near stoichiometric but with poor mechanical properties. It appears that films deposited from the composite target (Si + CdAs/sub 2/) can be adjusted to stoichiometry by means of sputtering power and target geometry. As deposited, these films also were amorphous. With respect to evaporated films, the study of thermal decomposition of CdSiAs/sub 2/ in vacuum was completed. The decomposition is preferential toward Cd between 570/sup 0/ and 710/sup 0/C, and toward As in the 710 to 1010/sup 0/C range. It is concluded that evaporation of the ternary is not a suitable method for forming CdSiAs/sub 2/ films. Plans for …
Date:
July 25, 1979
Creator:
Burton, L.C. & Slack, L.H.
Object Type:
Report
System:
The UNT Digital Library
Final report for the Chautauqua Radio Workshop Project. July 1, 1980-October 30, 1981
Energy conservation education must reach millions of Americans in order to see any real and immediate decrease in energy consumption. Since our society gets much of its information from the media, this seems like a most effective vehicle for disseminating energy conservation information to the American Public. Radio is listened to by the vast majority of Americans each day of their lives. Radio as a communications medium is an extremely cost effective method of mass communication and education, and is perceived as a personal medium which has great potential to affect a change in the daily energy consumption habits of the public. Call-in radio programs centering around energy conservation are an effective method of presenting informative, energy education programming that provide instantaneous access for listener/consumer participation. The linking of available telephone and radio technology (via call-in radio shows) allows people all over the US, including remote rural areas, access to the latest energy conservation information and renewable energy technolgy.
Date:
January 25, 1982
Creator:
Renz, B.
Object Type:
Report
System:
The UNT Digital Library
Syria: Overview of the Humanitarian Response
This report examines the ongoing humanitarian crisis in Syria and the U.S. and international response. It discusses the use of chemical weapons in Syria on August 21, 2013 that triggered an intense debate over possible U.S. military intervention.
Date:
February 25, 2014
Creator:
Margesson, Rhoda & Chesser, Susan G.
Object Type:
Report
System:
The UNT Digital Library
Health Care for Veterans: Answers to Frequently Asked Questions
This report provides responses to frequently asked questions about health care provided to veterans through the Veterans Health Administration (VHA). It is intended to serve as a quick reference to provide easy access to information. Where applicable, it provides the legislative background pertaining to the question.
Date:
February 25, 2014
Creator:
Panangala, Sidath Viranga & Bagalman, Erin
Object Type:
Report
System:
The UNT Digital Library
Navy Littoral Combat Ship (LCS) Program: Background and Issues for Congress
This report provides background information and potential issues for Congress on the Littoral Combat Ship (LCS), a relatively inexpensive Navy surface combatant equipped with modular "plug-and-fight" mission packages for countering mines, small boats, and diesel-electric submarines, particularly in littoral (i.e., near-shore) waters.
Date:
February 25, 2014
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
The Affordable Care Act and Small Business: Economic Issues
This report explains how employer-sponsored insurance can be used to address concerns about health insurance coverage and cost. Then, it summarizes the three ACA provisions most relevant to small businesses. Also, it analyzes these provisions for their potential effects on small businesses. Last, this report presents several approaches that could address some concerns associated with these provisions (particularly the employer penalty).
Date:
February 25, 2014
Creator:
Lowry, Sean & Gravelle, Jane G.
Object Type:
Report
System:
The UNT Digital Library
Offender Reentry: Correctional Statistics, Reintegration into the Community, and Recidivism
This report provides background information regarding the prison population in the United States that has been growing steadily for more than 30 years. The report presents correctional system statistics and discusses the federal government's involvement in offender reentry programs and the Second Chance Act (P.L. 110-199) that was enacted on April 9, 2008.
Date:
February 25, 2014
Creator:
James, Nathan
Object Type:
Report
System:
The UNT Digital Library
Invoking Cloture in the Senate
This report discusses cloture, the only procedure by which the Senate can vote to set an end to a debate without also rejecting the bill, amendment, conference report, motion, or other matter it has been debating.
Date:
November 25, 2013
Creator:
Davis, Christopher M.
Object Type:
Report
System:
The UNT Digital Library