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Results:
18,865 - 18,884 of
18,884
X-ray safety at the Los Alamos National Laboratory
An organized and structured safety program for x-ray generating devices was initiated in October, 1979. An X-ray Device Control Office was established to manage the program that currently oversees the activities of 201 x-ray generating devices and to provide SOP reviews, perform shielding calculations, and provide training for both the operators and health physics x-ray device surveyors. The new program also establishes controls for procurement of new equipment, requires the writing of Standard Operating Procedures, requires training for operators and provides routine and non-routine safety inspections of x-ray generating devices. Prior to this program going into effect, the Laboratory had recorded nine documented x-ray related exposure accidents. Since then, there have been none. Program elements and experiences of interest to other x-ray device users are discussed. 3 refs.
Date:
November 1, 1986
Creator:
Gutierrez, J.A.
Object Type:
Article
System:
The UNT Digital Library
XUV harmonic enhancement by magnetic fields
We examine three ways to enhance harmonic output of an XUV planar free-electron laser (FEL) operating in the Compton regime. The first method is to increase the rms static magnetic field, making it as large as possible. The second is by adding effective magnetic fields at the harmonics, thereby increasing the coupling to the harmonics. The third is by phase programming; i.e. programming the magnetic field to introduce jumps in the phase of the electrons as they move through phase space.
Date:
September 1, 1986
Creator:
Elliott, Carl James & Schmitt, Mark Jude
Object Type:
Article
System:
The UNT Digital Library
Yakima River Spring Chinook Enhancement Study, 1985 Annual Report.
The purpose was to evaluate enhancement methodologies that can be used to rebuild runs of spring chinook salmon in the Yakima River basin. The objectives were to: (1) determine the abundance, distribution and survival of naturally produced fry and smolts in the Yakima River; (2) evaluate different methods of fry and smolt supplementation into the natural rearing environment while maintaining as much as possible the gentic integrity of naturally produced stocks; (3) locate and define areas in the watershed which may be used for the rearing of spring chinook; (4) define strategies for enhancing natural production of spring chinook in the Yakima River; and (5) determine physical and biological limitations for production within the system.
Date:
February 1, 1986
Creator:
Fast, David E.
Object Type:
Report
System:
The UNT Digital Library
Yakima River Spring Chinook Enhancement Study, 1986 Annual Report.
A total of eight spring chinook redds were successfully capped in 1986. The mean survival to emergence was 56.7% and ranged from 21.9 to 90.0%. The spring outmigration at Wapatox was estimated to be 6671 smolts. The 1986 outmigration of wild spring chinook from the Yakima Basin was estimated to be 169,076 smolts at Prosser. The survival from egg to smolt was 4.6%, which gives a mean egg to smolt survival over four years of 5.1%. In 1986 a total of 8557 adult and 349 jack spring chinook salmon returning to the Yakima River were counted at Prosser fish ladder. An additional 530 fish were estimated to have been caught in the Yakima River subsistence dipnet fishery below Horn Rapids and Prosser Dams. This was the largest return of spring chinook salmon to the Yakima River in 29 years. The smolt to adult (S/sub sa/) survival was estimated to be 6102 wild three, four, and five year old fish returned from an estimated smolt outmigration of 135,548 fish in 1983. This gives an estimated survival from smolt to adult of 4.4%.
Date:
November 1, 1986
Creator:
Fast, David E.
Object Type:
Report
System:
The UNT Digital Library
Yeager Creek Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24,000
Date:
1986
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
The Yellow Jacket, Yearbook of Thomas Jefferson High School, 1986
Yearbook for Thomas Jefferson High School in Port Arthur, Texas includes photographs of and information about the school, student body, teachers, and organizations.
Date:
1986
Creator:
Thomas Jefferson High School
Object Type:
Yearbook
System:
The Portal to Texas History
Yet another possible explanation of the solar-neutrino puzzle
Mikheyev and Smirnov have shown that the interactions of neutrinos with matter can result in the conversion of electron neutrinos produced in the center of the sun to muon neutrinos. Bethe has exploited this and has pointed out that the solar-neutrino puzzle can be resolved if the mass difference squared of the two neutrinos is m/sub 2//sup 2/ - m /sub 1//sup 2/ approx. = 6 x 10/sup -5/ eV/sup 2/, and the mixing angle satisfies sin theta/sub v/ > 0.0065. We discuss a qualitatively different solution to the solar-neutrino puzzle which requires 1.0 x 10/sup -8/ < (m/sub 2//sup 2/ - m/sub 1//sup 2/) (sin/sup 2/ 2theta/sub v//cos 2theta/sub v/) < 6.1 x 10/sup -8/ eV/sup 2/. Our solutions result in a much smaller flux of neutrinos from the p - p process than predicted by standard solar models, while Bethe's solution results in a flux of neutrinos from the p - process that is about the same as standard solar models.
Date:
April 1, 1986
Creator:
Kolb, E. W.; Turner, M. S. & Walker, T. P.
Object Type:
Report
System:
The UNT Digital Library
[You and Your "Career"]
Informational packet regarding careers and employment. The packet includes activity and informational sheets regarding employment. Cartoon figures demonstrating various careers appear on the front cover.
Date:
1986~
Creator:
Southwestern Bell Telephone.
Object Type:
Text
System:
The Portal to Texas History
Young Adult Literature and Censorship: A Content Analysis of Seventy-Eight Young Adult Books
The purpose of this study was to analyze a representative seventy-eight current young adult books to determine the extent to which they contain items which are objectionable to would-be censors. Seventy-eight books were identified which fit the criteria of popularity and literary quality. Content analysis was selected as the quantitative method of research. Each of the seventy-eight young adult books was analyzed for the six categories which were established through prior research. The six categories include profanity, sex, violence, parent conflict, drugs, and condoned bad behavior. These categories were tallied each time they occurred in the books. Reliability was assured with a rating of .98 by a committee of six professionals. The data reveal that profanity occurred more times in the seventy-eight books than the other five categories with a total of 5,616. The category of drugs was noted 4,171 times. References to sex followed in number with 3,174. The categories which occurred the least were violence with 1,849 occurrences and condoned bad behavior with only 489 occurrences. By applying a frequency index formula to determine the number of objections in each book in relation to the number of pages, a comparison among the books could be made. The analysis, …
Date:
December 1986
Creator:
Horton, Nancy Spence
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
ZAP user's manual
The use and content of Phase I of the accelerator physics code ZAP, which calculates the performance of a storage ring in terms of the effects of beam intensity dependent phenomena and the limitations they impose. A brief overview is provided of the code and the types of calculations that can be performed with it. The types of calculations available include: single bunch thresholds, single bunch longitudinal parameters and energy scaling tables, longitudinal coupled-bunch instabilities, transverse coupled-bunch instabilities, gas scattering lifetime, free electron laser formulae, intrabeam scattering, Touschek scattering, and ion trapping formulae. Examples of the required inputs and resultant outputs for each of the options are given. The theoretical foundations behind ZAP are summarized, providing the relevant formulations, physical models, and particularly the equations used in the code in evaluating the various effects that are computed. (LEW)
Date:
December 1, 1986
Creator:
Zisman, M. S.; Chattopadhyay, S. & Bisognano, J. J.
Object Type:
Report
System:
The UNT Digital Library
Zeeman Laser Scattering (ZLS): a new light scattering technique
A new light scattering technique, called Zeeman Laser Scattering (ZLS), which uses a two-frequency Zeeman effect laser, is described. The Zeeman effect laser produces two coherent, colinear laser beams having orthogonal polarizations. The laser output is passed unfocused through a scattering cell containing the sample of interest, and the light scattered at each scattering angle is detected with a photomultiplier tube mounted on an arm that rotates under computer control about the scattering cell. The phase and amplitude of the beats produced by the interference of the two colinear laser beams are measured. Three different scattering mechanisms to which ZLS is sensitive are described, and the quantitative theory of ZLS is derived from the scattering amplitude matrix formalism. Samples of ZLS data are given. (LEW)
Date:
January 1, 1986
Creator:
Johnston, Roger G.; Singham, Shermila B. & Salzman, Gary C.
Object Type:
Article
System:
The UNT Digital Library
Zeolitic alteration and fracture fillings in silicic tuffs at a potential nuclear waste repository, Yucca Mountain, Nevada, USA
This paper describes the distribution and chemistry of zeolites in tuffs and in fractures at Yucca Mountain. Samples used in this study were collected from continuously-cored exploratory drill holes. A variety of analytical techniques, including optical petrography, x-ray powder diffraction, electron microanalysis, and x-ray fluorescence, were used to characterize the distribution and chemistry of zeolites in these samples.
Date:
December 31, 1986
Creator:
Broxton, David E. & Carlos, Barbara Arney
Object Type:
Article
System:
The UNT Digital Library
Zero-flux planes, flux reversals and diffusion paths in ternary and quaternary diffusion
During isothermal multicomponent diffusion, interdiffusion fluxes of individual components can go to zero at zero-flux planes (ZFP) and exhibit flux reversals from one side to the other of such planes. Interdiffusion fluxes as well as the locations and compositions of ZFPs for components are determined directly from the concentration profiles of diffusion couples without the need for prior knowledge of interdiffusion coefficients. The development and identification of ZFPs is reviewed with the aid of single phase and two-phase diffusion couples investigated in the Cu-Ni-Zn system at 775/sup 0/C. ZFP locations in the diffusion zone nearly correspond to sections where the activity of a component is the same as its activity in either of the terminal alloys of a couple. Path slopes at ZFPs are uniquely dictated by the atomic mobility and thermodynamic data for the components. Discontinuous flux reversals for the components can also occur at interfaces in multiphase couples. Identification of ZFPs is also presented for diffusion in the Cu-Ni-Zn-Mn quaternary system. Analytical representation of diffusion paths for both ternary and quaternary diffusion couples is presented with the aid of characteristic path parameters.
Date:
May 23, 1986
Creator:
Dayananda, M.A.
Object Type:
Report
System:
The UNT Digital Library
D-Zero Vacuum System
The system pumping speed was calculated by taking the reciprocal of the sum of the reciprocal pump speed and the reciprocal line conductances. The conductances of the pipe were calculated from the following formulas taken from the Varian vacuum manual. This report updates the original to reflect the pumping curves and basic vacuum system characteristics for the purchased components and installed piping of the D-Zero vacuum system. The system consists of two Edward's E2M275 two stage mechanical pumps, a Leybold-Heraeus WSU2000 Blower and three Varian 4' diffusion pumps (one for each cryostat). Individual pump and system pumping speed curves and a diagram of the system is included.
Date:
April 7, 1986
Creator:
Wintercorn, S.J.
Object Type:
Report
System:
The UNT Digital Library
Zinc/air battery R and D research and development of bifunctional oxygen electrode: Tasks I and II, Final report
Studies were conducted of the bifunctional oxygen electrode. The development of a rechargeable metal-oxygen (air) cell has been hampered to a great extent by the lack of a stable and cost effective oxygen electrode capable of use during both charge and discharge. The first type of bifunctional electrode consists of two distinct catalytifc layers. The oxygen reduction catalyst layer containing a supported gold catalyst is in contact with a hydrophilic nickel layer in which evolution of oxygen takes place. Loadings of gold from 0.5 to 1.0 mg/cm/sup 2/ were investigated; carbon, graphite, metal, and spinel oxides were evaluated as substrates. The second part of the research effort was centered on developing a reversible oxygen electrode containing only one catalytic layer for both reduction and evolution of oxygen. The work was directed specifically to the study of perovskite type of oxides with the composition AA/sup 1/BO/sub 3/ where A is an element of the lanthanide series, A/sup 1/ is an alkaline earth metal and B, a first row transition element. Initial polarization data obtained in unscrubbed air gave a value of approximately 200 millivolts vs Hg/HgO reference electrode at a current density of 50 ma/cm/sup 2/. Electrodes were made both by …
Date:
December 1, 1986
Creator:
Klein, M. & Viswanathan, S.
Object Type:
Report
System:
The UNT Digital Library
Ziptrack integrator
This technical memo is a brief owner's manual describing the operation and design of the ziptrack integrator. This electronic circuit is part of a magnetic field mapping devices in use on the Tevatron I at Fermilab. 7 figs., 15 tabs. (DWL)
Date:
August 15, 1986
Creator:
Prabhakar, Ernest N.
Object Type:
Report
System:
The UNT Digital Library
Zirconium pressure tube testing: Test procedures, Production Assurance Program (Project H-700)
UNC Nuclear Industries (UNC) has initiated a plan for the fabrication of zirconium alloy pressure tubes required for the future operation of N-Reactor. As part of this plan, UNC is establishing a program to qualify and develop a process capable of fabricating these pressure tubes to the requirements of UNC specification HWS 6502, REV. 4, Amendment 1. The objective of the Pressure Tube Testing Task is to support the UNC program-by performing physical, mechanical and chemical testing on prototype tube sections produced during FY-1986, 1987 and 1988 and to test samples from production runs after 1988 as may be required. The types of tests included in the Zirconium Pressure Tube Testing Program will be as follows: tensile tests; burst tests; fracture toughness tests; corrosion tests; chemical composition analyses; grain structure evaluations. The purpose of this document is to define the procedures that will be used in each type of test included in this task.
Date:
June 1, 1986
Creator:
Zaloudek, F. R. & Lewis, M.
Object Type:
Report
System:
The UNT Digital Library
Zone approaches to international safeguards of a nuclear fuel cycle
At present the IAEA designs its safeguards approach with regard to each type of nuclear facility so that the safeguards activities and effort are essentially the same for a given type and size of nuclear facility wherever it may be located. Conclusions regarding a state are derived by combining the results of safeguards verifications for the individual facilities within it. We have examined safeguards approaches for a state nuclear fuel cycle that take into account the existence of all of the nuclear facilities in the state. We have focussed on the fresh-fuel zone of an advanced nuclear fuel cycle, the several facilities of which use or process low-enriched uranium. At one extreme, flows and inventories would be verified at each material balance area. At the other extreme, the flows into and out of the zone and the inventory of the whole zone would be verified. The intention is to develop an approach which will make it possible to compare the technical effectiveness and the inspection effort for the facility-oriented approach, for the zone approach and for some reasonable intermediate safeguards approaches. Technical effectiveness, in these cases, means an estimate of the assurance that all nuclear material has been accounted for.
Date:
January 1, 1986
Creator:
Fishbone, L.G. & Higinbotham, W.A.
Object Type:
Article
System:
The UNT Digital Library
Zone plate imaging of 14-MeV neutrons
At Livermore we are interested in imaging the thermonuclear burn region of fusion targets irradiated at our Nova laser facility. We expect compressed core diameters to be 10's of microns, and would like images with better than 10-..mu..m resolution. Alpha particle images provided the first direct information about the thermonuclear burn geometry in thin walled exploding pusher targets. In future high density target experiments, only highly penetrating radiations like the 14-MeV neutrons will escape the target core to provide information about the burn region. To make the measurement with a neutron ''pinhole'' camera requires a 10..mu..m pinhole through about 10 cm of material and 10/sup 14/ to 10/sup 15/ source neutrons. Penumbral imaging offers some improvement over a pinhole. Zone plate coded imaging (ZPCI) techniques are particularly well suited for imaging small objects like the compressed core of a laser fusion target. We have been using ZPCI techniques to image nonpenetrating radiations like x rays and alpha particles for about 10 years. The techniques are well developed. Imaging penetrating radiations like 14-MeV neutrons using ZPCI techniques has several possible advantages. The large solid angle subtended by the Zone plate might substantially reduce the required target neutron yield needed to produce …
Date:
January 28, 1986
Creator:
Lerche, R. A.; Lane, S. M.; Hawryluk, A. M. & Ceglio, N. M.
Object Type:
Article
System:
The UNT Digital Library
ZT-P: an advanced air core reversed field pinch prototype
The ZT-P experiment, with a major radius of 0.45 m and a minor radius of 0.07 m, was designed to prototype the next generation of reversed field pinch (RFP) machines at Los Alamos. ZT-P utilizes an air-core poloidal field system, with precisely wound and positioned rigid copper coils, to drive the plasma current and provide plasma equilibrium with intrinsically low magnetic field errors. ZT-P's compact configuration is adaptable to test various first wall and limiter designs at reactor-relevant current densities in the range of 5 to 20 MA/m/sup 2/. In addition, the load assembly design allows for the installation of toroidal field divertors. Design of ZT-P began in October 1983, and assembly was completed in October 1984. This report describes the magnetic, electrical, mechanical, vacuum, diagnostic, data acquisition, and control aspects of the machine design. In addition, preliminary data from initial ZT-P operation are presented. Because of ZT-P's prototypical function, many of its design aspects and experimental results are directly applicable to the design of a next generation RFP. 17 refs., 47 figs.
Date:
January 1, 1986
Creator:
Schoenberg, K. F.; Buchenauer, C. J.; Burkhardt, L. C.; Caudill, L. D.; Dike, R. S.; Dominguez, T. et al.
Object Type:
Report
System:
The UNT Digital Library