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7,174 Matching Results
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Nonlinear ion-cyclotron waves in mirror machines. Paper IAEA-CN-38/S-1
Experimental results on ion-cyclotron waves observed in the 2XIIB mirror machine are reviewed, and relevant theoretical work is discussed. The work reported generally substantiates the quasilinear diffusion model of mirror-plasma confinement, but also suggests alternatives. The end-loss current required by theory of the drift-cyclotron loss-cone (DCLC) instability agrees with measurements of this current. The experiment indicates that an increased ratio of plasma radius to ion gyroradius improves plasma confinement. However, measurements sometimes show a second ion-cyclotron mode, which is not the DCLC mode. Theoretical work on loss-cone instabilities has concentrated on linear, quasilinear, and fully nonlinear models of increased sophistication and experimental applicability.
Date:
May 22, 1980
Creator:
Cohen, B. I.; Smith, G. R. & Berk, H. L.
Object Type:
Article
System:
The UNT Digital Library
Method of recovery of alkali-metal constituents from coal-conversion residues. [Patent application]
A coal gasification operation or similar conversion process is carried out in the presence of an alkali metal-containing catalyst producing char particles containing alkali metal residues. Alkali metal constituents are recovered from the particles by burning the particles to increase their size and density and then leaching the particles of increased size and density with water, to extract the water-soluble alkali metal constituents.
Date:
April 22, 1981
Creator:
unknown
Object Type:
Patent
System:
The UNT Digital Library
Antiproton-hydrogen atom rearrangement-annihilation cross section
For antiproton energies of several eV or less, annihilation in matter occurs through atomic rearrangement processes in which the antiproton becomes bound to a nucleus prior to annihilation. Existing calculations of the antiproton-hydrogen atom rearrangement cross section are semiclassical and employ the Born-Oppenheimer approximation. They also employ various arguments in regard to the behavior of the system when the Born-Oppenheimer approximation breaks down at small antiproton-proton separations. These arguments indicate that rearrangement is essentially irreversible. In the present study, a detailed investigation was made of the antiproton-hydrogen atom system when the Born-Oppenheimer approximation breaks down. The results of this study indicate that the previous arguments were approximately correct, but that there is a significant probability for rearrangement reversing prior to annihilation. This probability is estimated to be about 20%. 8 refs., 4 figs., 2 tabs.
Date:
August 22, 1986
Creator:
Morgan, D.L. Jr.
Object Type:
Article
System:
The UNT Digital Library
MARITIME GAS-COOLED REACTOR PROGRAM. A REVIEW OF THE MARITIME GAS-COOLED REACTOR PROGRAM
Presented at the Eleventh Professional Divisions Conference of the San Francisco Section of the American Society of Mechanical Engineers, Noveraber l6, l96l. The MGCR program and its objectives are discussed. The basic MGCR plant is described. The design of the Experimental Beryllium Oxide Reactor is also described. (M.C.G.)
Date:
December 22, 1961
Creator:
Trickett, K.A.
Object Type:
Report
System:
The UNT Digital Library
Flow of particle suspensions through porous media
A new attempt is made to study the mechanisms of particle invasions into porous media. The following subjects are described: A critical survey of the literature indicating that the mechanism of particle invasions is not known in sufficient detail. The pros and cons of existing particle measuring devices are briefly described. Results from a new laboratory study on particle characterizations are given. The results of the laboratory studies on the flow of particle suspensions through porous media (up to 200 md) are discussed. The effects of flow rate and particle concentrations on the amount of damage (i.e., permeability impairment) and depth of penetration (from core inlet towards outlet) are particularly emphasized. Filter methods (e.g., using millipore filter) cannot be used to determine particle invasions into porous medium. Any predictions of the injection problems based on millipore (or any other filter) measurements are useless and should be discarded.
Date:
June 22, 1982
Creator:
Vetter, O.J.; Kandarpa, V. & Harouaka, A.
Object Type:
Report
System:
The UNT Digital Library
ac-resistance-measuring instrument
An auto-ranging ac resistance measuring instrument for remote measurement of the resistance of an electrical device or circuit connected to the instrument includes a signal generator which generates an ac excitation signal for application to a load, including the device and the transmission line, a monitoring circuit which provides a digitally encoded signal representing the voltage across the load, and a microprocessor which operates under program control to provide an auto-ranging function by which range resistance is connected in circuit with the load to limit the load voltage to an acceptable range for the instrument, and an auto-compensating function by which compensating capacitance is connected in shunt with the range resistance to compensate for the effects of line capacitance.
Date:
April 22, 1981
Creator:
Hof, P. J.
Object Type:
Patent
System:
The UNT Digital Library
Cold-pressure-welded joints in large multifilamentary Nb--Ti superconductors
A number of mechanical and electrical measurements were made on joints in typical conductors for the proposed mirror fusion test facility (MFTF) and high field test facility (HFTF). For such measurements, a commercially available cold-pressure-welding machine was used. For joints in the MFTF conductor, which has a large proportion of superconductor, joint strength approached conductor strength. For the HFTF conductor, where the Cu-to-superconductor ratio is 4.33/1, the joint is stronger than the conductor. Electrically, the joints were not superconducting.. While the resistance is higher than might be achieved by other forms of joining, we feel that the cold-weld joint has the advantages of simplicity, speed, reliability, and reproducibility. This makes the method attractive for MFTF, where resistance losses will be small compared with the total 4 K refrigeration requirements.
Date:
September 22, 1977
Creator:
Cornish, D.N.; Deis, D.W. & Zbasnik, J.P.
Object Type:
Article
System:
The UNT Digital Library
Polarizer reflectivity variations
On Shiva the beam energy along the chain is monitored using available reflections and/or transmission through beam steering, splitting, and polarizing optics without the intrusion of any additional glass for diagnostics. On the preamp table the diagnostic signal is obtained from the signal transmitted through turning mirrors. At the input of each chain the signal is obtained from the transmission through one of the mirrors used for the chain input alignment sensor (CHIP). At the chain output the transmission through the final turning mirror is used. These diagnostics have proved stable and reliable. However, one of the prime diagnostic locations is at the output of the beta rod. The energy at this location is measured by collecting small reflections from the last polarizer surface of the beta Pockels cell polarizer package. Unfortunately, calibration of this diagnostic has varied randomly, seldom remaining stable for a week or more. The cause of this fluctuation has been investigated for the past year and'it has been discovered that polarizer reflectivity varies with humidity. This report will deal with the possible causes that were investigated, the evidence that humidity is causing the variation, and the associated mechanism.
Date:
February 22, 1980
Creator:
Ozarski, R.G. & Prior, J.
Object Type:
Report
System:
The UNT Digital Library
Plasma confinement experiments in the TMX tandem mirror. Paper IAEA-CN-38/F-1
Results from the new Tandem Mirror Experiment (TMX) are described. Tandem-mirror density and potential profiles are produced using end-plug neutral-beam injection and central-cell gas-fueling. TMX parameters are near those predicted theoretically. The end-plug electron temperature is higher than in the comparably sized single-mirror 2XIIB. Axial confinement of the finite-beta central-cell plasma is improved by the end plugs by as much as a factor of 9. In TMX, end-plug microinstability limits central-cell confinement in agreement with theory.
Date:
May 22, 1980
Creator:
Simonen, T. C.; Anderson, C. A. & Casper, T. A.
Object Type:
Article
System:
The UNT Digital Library
On reactor type comparisons for the next generation of reactors
In this paper, we present a broad comparison of studies for a selected set of parameters for different nuclear reactor types including the next generation. This serves as an overview of key parameters which provide a semi-quantitative decision basis for selecting nuclear strategies. Out of a number of advanced reactor designs of the LWR type, gas cooled type, and FBR type, currently on the drawing board, the Advanced Light Water Reactors (ALWR) seem to have some edge over other types of the next generation of reactors for the near-term application. This is based on a number of attributes related to the benefit of the vast operating experience with LWRs coupled with an estimated low risk profile, economics of scale, degree of utilization of passive systems, simplification in the plant design and layout, modular fabrication and manufacturing. 32 refs., 1 fig., 3 tabs.
Date:
August 22, 1991
Creator:
Alesso, H.P. & Majumdar, K.C.
Object Type:
Article
System:
The UNT Digital Library
Heavy quark production in ep collisions at HERA. [None]
There are substantial production rates of heavy quarks from ep collisions at HERA. The center of mass energy of about 300 GeV is well above any b-quark threshold effects, and for b/bar b/ production, the cross section is estimated to be 3.3 nb per event, leading to rates approaching 10/sup 6/ b mesons per year. The rates for c/bar c/ production are about two orders of magnitude greater. Two major detectors are under construction and a program of heavy quark physics will start in 1990. 3 refs., 4 figs.
Date:
December 22, 1987
Creator:
Derrick, M.
Object Type:
Article
System:
The UNT Digital Library
Harmonic generation of ion waves due to Brillouin backscattering
We report results of simulations of stimulated Brillouin backscatter in which we see the second spatial harmonic of the ion density fluctuation and compare with linear, fluid theory. We also describe examples of the competition between Raman and Brillouin backscatter. 21 refs., 3 figs.
Date:
May 22, 1985
Creator:
Estabrook, K.; Kruer, W. L. & Haines, M. G.
Object Type:
Article
System:
The UNT Digital Library
Hazard-identification matrix for 10-MW/sub e/ solar-thermal central-receiver pilot plant: preliminary hazard-analysis input
The hazard matrix is our gross identifier of potential solar collector subsystem hazards. The matrix will be used as a hazard reference in the accomplishment of the preliminary design hazard analysis, and to assist system design engineers in the evaluation of the specific subsystem design.
Date:
November 22, 1978
Creator:
Wander, H.R.
Object Type:
Report
System:
The UNT Digital Library
Inclusive large mass muon pair production in ultra-relativistic nucleus-nucleus collisions for colliding beams
For colliding beams of several species of ions we compare thermal to perturbative quantum chromodynamic contributions for inclusive large mass muon pair production by using a hydrodynamic model to estimate the temperatures of the quark-gluon plasma produced by each species. The production of high energy dimuons with M {approx equal}-4 GeV, will be favored energetically by the quark-gluon plasma. 10 refs., 4 figs., 2 tabs.
Date:
July 22, 1988
Creator:
Roberts, L.E. (Lincoln Univ., PA (United States). Dept. of Physics Argonne National Lab., IL (United States). High Energy Physics Div. Institute for Scientific Studies, Wheaton, IL (United States))
Object Type:
Report
System:
The UNT Digital Library
Expiring Unemployment Insurance Provisions
This report discusses several key provisions related to extended federal unemployment benefits that are temporary and, therefore, scheduled to expire. This report describes the consequences of these expirations for the financing and availability of unemployment benefits in states. It also summarizes the last three laws that have extended these expiring provisions: P.L. 112-240, P.L. 112-96, and P.L. 112-78.
Date:
November 22, 2013
Creator:
Isaacs, K. P.
Object Type:
Report
System:
The UNT Digital Library
Legislative Actions to Repeal, Defund, or Delay the Affordable Care Act
This report summarizes legislative and other actions taken to repeal, defund, or delay the Affordable Care Act (ACA), since the law's enactment. The information is presented in four appendixes.
Date:
November 22, 2013
Creator:
Redhead, C. S. & Kinzer, Janet
Object Type:
Report
System:
The UNT Digital Library
The International Whaling Convention (IWC) and Legal Issues Related to Aboriginal Rights
This report discusses the recent legislation regarding whaling in general, and aboriginal whaling in particular. Legislative measures, primarily in the form of concurrent resolutions, have been proposed in four categories: protesting commercial, scientific, or community (nonaboriginal) whaling; ensuring aboriginal whaling rights; providing a tax break for aboriginal whaling captains; and addressing the United States' policy at the annual meetings of the IWC.
Date:
July 22, 2013
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
The Federal Networking and Information Technology Research and Development Program: Background, Funding, and Activities
This report discusses the federal government's role in the country's information technology (IT) research and development (R&D) activities. The government's support of IT R&D began because it had an important interest in creating computers and software that would be capable of addressing the problems and issues the government needed to solve and study.
Date:
October 22, 2013
Creator:
Figliola, Patricia Moloney
Object Type:
Report
System:
The UNT Digital Library
U.S. Strategic Nuclear Forces: Background, Developments, and Issues
This report reviews the ongoing programs that will affect the expected size and shape of the U.S. strategic nuclear force structure. It begins with an overview of this force structure during the Cold War, and summarizes the reductions and changes that have occurred since 1991. It then offers details about each category of delivery vehicle--land-based intercontinental ballistic missiles (ICBMs), submarine launched ballistic missiles (SLBMs) and heavy bombers--focusing on their current deployments and ongoing and planned modernization programs. The report concludes with a discussion of issues related to decisions about the future size and shape of the U.S. strategic nuclear force.
Date:
October 22, 2013
Creator:
Woolf, Amy F.
Object Type:
Report
System:
The UNT Digital Library
Navy Littoral Combat Ship (LCS) Program: Background and Issues for Congress
Report that provides background information and potential issues for Congress on the Littoral Combat Ship (LCS).
Date:
July 22, 2013
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Defense Surplus Equipment Disposal: Background Information
This report discusses the Department of Defense (DOD) policy via the Defense Utilization and Marketing Service (DRMS) for disposing of government equipment and supplies considered surplus or deemed unnecessary to the agency's currently designated mission. The report focuses on DRMS background, as well as the most recent DRMS policy modifications.
Date:
August 22, 2013
Creator:
Bailey Grasso, Valerie
Object Type:
Report
System:
The UNT Digital Library
China's Currency Policy: An Analysis of the Economic Issues
Report that provides an overview of the economic issues surrounding the current debate over China's currency policy. It identifies the economic costs and benefits of China's currency policy for both China and the United States, and possible implications if China were to allow its currency to significantly appreciate or to float freely. It also examines proposed legislation in the 111th Congress that seek to address China's currency policy.
Date:
July 22, 2013
Creator:
Morrison, Wayne M. & Labonte, Marc
Object Type:
Report
System:
The UNT Digital Library
Political Transition in Tunisia
Report that discusses Tunisia's pro-democracy movement; concerns over potential instability in a previously secure, pro-Western area; and U.S.-Tunisian relations.
Date:
May 22, 2013
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
The Crime Victims Fund: Federal Support for Victims of Crime
Report that provides background and funding information for Victims of Crime Act (VOCA) programs and the Crime Victims Fund (CVF). It describes the process through which CVF funds are allocated and explains how the CVF impacts the annual budget for Department of Justice (DOJ).
Date:
August 22, 2012
Creator:
Sacco, Lisa N.
Object Type:
Report
System:
The UNT Digital Library