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AIDS: International Problems and Issues

Description: This issue brief discusses the AIDS (Acquired Immune Deficiency Syndrome) virus and its effects on the world, especially with regard to the welfare of developing nations and various facets of general international relations. Also discussed are the related issues for Congress and U.S. contributions to international AIDS relief efforts led by the World Health Organization (WHO).
Date: January 6, 1988
Creator: McHugh, Lois B.
Item Type: Refine your search to only Report
open access

Alternating gradient synchrotron

Description: With the start of a research and development effort directed towards the Superconducting Super Collider (SSC), it is essential that US industry become involved as soon as possible. For that reason, I describe what a conventional accelerator complex is like and therefore what the first stages of the SSC would entail.
Date: December 6, 1984
Creator: Lowenstein, D.I.
Item Type: Refine your search to only Article
open access

Analysis of NSWC quasi-static compaction data for porous beds of ball powder, melamine, and Teflon, using structural compaction model

Description: A structural compaction model is used to correlate NSWC quasi-static compaction data on porous beds of six (6) different materials, i.e., four (4) ball powders, melamine, and Teflon. Initial densities of the porous beds ranged from 44 percent solid theoretical maximum density (TMD) to 70 percent TMD. Maximum compacted densities were about 90 percent TMD except for Teflon which was compacted to approximately 98 percent TMD. Pressures calculated by the model, plotted as a function of percent TMD,… more
Date: April 6, 1983
Creator: Weston, A. M. & Lee, E. L.
Item Type: Refine your search to only Report
open access

Analysis of technetium in SRP uranium product streams

Description: Technetium (Tc) is a major fission product with a fission yield similar to {sup 90}Sr and {sup 137}Cs. All traces of the natural element have disappeared due to decay over the earth`s history. The major isotope present in cooled nuclear fuel is {sup 99}Tc with a half life of 2.12 {times} 10{sup 5} years. This isotope decays via low energy (0.292 Mev) beta emission which is easily absorbed and contributes little penetrating radiation hazards in fuel reprocessing. Because it is difficult to detec… more
Date: April 6, 1984
Creator: Orebaugh, E. G.
Item Type: Refine your search to only Report
open access

Analytical cytology applied to detection of induced cytogenetic abnormalities

Description: Radiation-induced biological damage results in formation of a broad spectrum of cytogenetic changes such as translocations, dicentrics, ring chromosomes, and acentric fragments. A battery of analytical cytologic techniques are now emerging that promise to significantly improve the precision and ease with which these radiation induced cytogenetic changes can be quantified. This report summarizes techniques to facilitate analysis of the frequency of occurrence of structural and numerical aberrati… more
Date: August 6, 1987
Creator: Gray, J.W.; Lucas, J.; Straume, T. & Pinkel, D.
Item Type: Refine your search to only Article
open access

The Application of Some Hartree-Fock Model Calculation to the Analysis of Atomic and Free-Ion Optical Spectra

Description: Techniques for applying ab-initio calculations to the is of atomic spectra are investigated, along with the relationship between the semi-empirical and ab-initio forms of Slater-Condon theory. Slater-Condon theory is reviewed with a focus on the essential features that lead to the effective Hamiltonians associated with the semi-empirical form of the theory. Ab-initio spectroscopic parameters are calculated from wavefunctions obtained via self-consistent field methods, while multi-configuration … more
Date: August 6, 1980
Creator: Hayhurst, Thomas Laine
Item Type: Refine your search to only Thesis or Dissertation
open access

Beam dynamics in the ETA and ATA 10 kA linear induction accelerators: observations and issues

Description: The 10 kA ETA and ATA linear induction accelerators are described. Beam instability is the major concern in these high current machines, and the current status of theoretical understanding, and experimental investigations with the 8 cavity ETA, are reviewed. Modifications to the induction cavities are described that have essentially eliminated the transverse resonant modes seen in the ETA.
Date: March 6, 1981
Creator: Briggs, R. J.; Birx, D. L.; Caporaso, G. J.; Fessenden, T. J.; Hester, R. E.; Melendez, R. et al.
Item Type: Refine your search to only Report
open access

Beamline transition radiation detector for MW

Description: Recent developments of transition radiation detectors (TRD's) indicate that an efficient and practical system can be deployed for beam line particle tagging for momenta greater than 200 GeV/c. This note describes the design of a prototype system to be tested at Fermilab in Fall, 1983. Pre-prototype testing was done at BNL in March, 1983 and has been followed up by bench testing of gasses and electronics at Fermilab. The design goal is a modular system which puts few contraints on beam line conf… more
Date: June 6, 1983
Creator: Haggerty, H.
Item Type: Refine your search to only Report
open access

Beryllium usage in fusion blankets and beryllium data needs. [None]

Description: Increasing numbers of designers are choosing beryllium for fusion reactor blankets because it, among all nonfissile materials, produces the highest number (2.5 neutron in an infinite media) of neutrons per 14-MeV incident neutron. In amounts of about 20 cm of equivalent solid density, it can be used to produce fissile material, to breed all the tritium consumed in ITER from outboard blankets only, and in designs to produce Co-60. The problem is that predictions of neutron multiplication in bery… more
Date: April 6, 1988
Creator: Moir, Ralph W.
Item Type: Refine your search to only Article
open access

Beta decay of neutron-rich transuranic nuclei

Description: Allowance is made for beta-delayed fission in the calculation of the mass yield of underground thermonuclear explosions. This allowance is made by calculating a correction factor by four different methods. These correction factors are applied to a simple model of product yield and the accuracy and potential usefulness of the results are discussed. 19 refs., 3 figs., 1 tab. (DWL)
Date: June 6, 1986
Creator: Hoff, R.W.
Item Type: Refine your search to only Article
open access

Betatron motion and optical deflection in free electron lasers

Description: Transverse displacement of the electron beam at input to the wiggler induces betatron oscillation, imparting a sinusoidal transverse displacement to the gain medium seen by the optical beam. As the light propagates down this ''rippled'' medium it is guided by the dispersion, thereby acquiring some transverse sinusoidal displacement. At output from the wiggler the optical beam in general has acquired some transverse component of velocity, that is, it propagates off-axis. As the e-beam displaceme… more
Date: October 6, 1985
Creator: Karr, T.J.
Item Type: Refine your search to only Report
open access

BWR containment failure analysis during degraded-core accidents

Description: This paper presents a containment failure mode analysis during a spectrum of postulated degraded core accident sequences in a typical 1000-MW(e) boiling water reactor (BWR) with a Mark-I wetwell containment. Overtemperature failure of containment electric penetration assemblies (CEPAs) has been found to be the major failure mode during such accidents.
Date: June 6, 1982
Creator: Yue, D.D.
Item Type: Refine your search to only Article
open access

Characteristics of coal/light hydrocarbon slurries in spray combustion. Semi-annual progress report, 1 September 1980-28 February 1981

Description: This report summarizes the progress made during the first six months of the grant period. The status of each of the three major task areas is discussed: the atomization study, the analytical droplet model, and the combustion study. The time-period has been used primarily to design and begin fabrication of the experimental atomization and combustion facilities. No data is presented in either of these areas. Significant progress has been made in the development of the numerical droplet model. The… more
Date: March 6, 1981
Creator: Grosshandler, William L.; Crowe, Clayon T. & Chung, Jacob N.
Item Type: Refine your search to only Report
open access

Characteristics of transition radiation in the x-ray spectral region

Description: Measurements of soft x-ray production by transition radiation have been performed in a series of experiments at the Lawrence Livermore National Laboratory. The results have shown that transition radiation is an intense and predictable source of photons in the soft x-ray energy range. This paper will give a brief review of the general properties of the x-ray distributions generated by these sources. 9 refs., 9 figs.
Date: June 6, 1986
Creator: Moran, M. J.
Item Type: Refine your search to only Article
open access

Closed Loop Test Facility for hot dirty gas valves

Description: A design study of a closed loop test facility for eight-inch hot dirty gas valves is presented. The objective of the facility is to quality valves for use in coal gasifiers, combined cycle plants, and pressurized fluid bed combustors. Outline sketches and estimated costs are presented for the selected design.
Date: February 6, 1980
Item Type: Refine your search to only Report
open access

Comparisons of hydrodynamic beam models with kinetic treatments

Description: Hydrodynamic models have been derived by Mark and Yu and by others to describe energetic self-pinched beams, such as those used in ion-beam fusion. The closure of the Mark-Yu model is obtained with adiabatic assumptions mathematically analogous to those of Chew, Goldberger, and Low for MHD. The other models treated here use an ideal gas closure and a closure by Newcomb based on an expansion in V/sub th//V/sub z/. Features of these hydrodynamic beam models are compared with a kinetic treatment.
Date: October 6, 1983
Creator: Boyd, J. K.; Mark, J. W.; Sharp, W. M. & Yu, S. S.
Item Type: Refine your search to only Article
open access

Computational Method for Thermoviscoelasticity With Application to Rock Mechanics

Description: Large-scale numerical computations associated with rock mechanics problems have required efficient and economical models for predicting temperature, stress, failure, and deformed structural configuration under various loading conditions. To meet this requirement, the complex dependence of the properties of geological materials on the time and temperature is modified to yield a reduced time scale as a function of time and temperature under the thermorheologically simple material (TSM) postulate.… more
Date: June 6, 1984
Creator: Lee, S. C.
Item Type: Refine your search to only Thesis or Dissertation
open access

Computer representation of molecular surfaces

Description: This review article surveys recent work on computer representation of molecular surfaces. Several different algorithms are discussed for producing vector or raster drawings of space-filling models formed as the union of spheres. Other smoother surfaces are also considered.
Date: July 6, 1981
Creator: Max, N.L.
Item Type: Refine your search to only Article
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