19 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Helium."  
Results: 1 - 19
open access

Experimental Study of the Neutronics of the First Gas Cooled Fast Reactor Benchmark Assembly (GCFR Phase 1 Assembly)

Description: The Gas Cooled Fast Reactor (GCFR) Phase I Assembly is the first in a series of ZPR-9 critical assemblies designed to provide a reference set of reactor physics measurements in support of the 300 MW(e) GCFR Demonstration Plant designed by General Atomic Company. The Phase I Assembly was the first complete mockup of a GCFR core ever built. A set of basic reactor physics measurements were performed in the assembly to characterize the neutronics of the assembly and assess the impact of the neutron… more
Date: December 1976
Creator: Bhattacharyya, S. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Neutron-Induced Helium Implantation in GCFR Cladding

Description: The neutron-induced implantation of helium atoms on the exterior surfaces of the cladding of a prototypic gas-cooled fast reactor (GCFR) has been investigated analytically. A flux of recoil helium particles as high as 4.2 x 10¹⁰ He/cm sq.s at the cladding surface has been calculated at the peak power location in the core of a 300-MWe GCFR. The calculated profile of the helium implantation rates indicates that although some helium is implanted as deep as 20 microns, more than 99% of helium parti… more
Date: October 1980
Creator: Yamada, H.; Poeppel, R. B. & Sevy, R. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Determination of the Fine Structure Constant Using Precision Measurements of Helium Fine Structure

Description: Spectroscopic measurements of the helium atom are performed to high precision using an atomic beam apparatus and electro-optic laser techniques. These measurements, in addition to serving as a test of helium theory, also provide a new determination of the fine structure constant α. An apparatus was designed and built to overcome limitations encountered in a previous experiment. Not only did this allow an improved level of precision but also enabled new consistency checks, including an extr… more
Date: August 2010
Creator: Smiciklas, Marc
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

The Reaction Between Hydrogen and Oxygen by Catalysis and the Thermal Reaction

Description: From abstract: "The reaction between hydrogen and oxygen with the aid of various catalysts (especially platinum on aluminua) has been studied, and the operating variables such as flow rates, space velocity, temperature, and gas composition have been examined rather extensively. It has been found that hydrogen and oxygen in stoichiometric proportions and mixed with either steam or helium may be made to react to the extent of 99.5% or greater at space velocities up to 30,000 hr-1, or even higher,… more
Date: January 15, 1952
Creator: Kuhn, D. W.; Ryon, A. D.; Palko, A. A. & Clewett, G. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Modeling Study of Gaseous Rn-222, Xe-133, and He-4 for Uranium Exploration

Description: From introduction: The emanation method of uranium exploration consists of measuring the abundance of one or more uranium decay products at some distance from the orebody itself. The halo of decay products expands the exploration target and improves the chances of detection. This method assumes that indicator nuclides migrate away from the ore by some physio-chemical mechanism such as diffusion or solution in groundwater. The indicators must remain at detectable concentrations and be distinguis… more
Date: 1980
Creator: Jeter, Hewitt W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Summary of Sandia research on metal tritides : FY 2007.

Description: Sandia National Laboratories has cradle to grave responsibility for all neutron generators in the US nuclear weapons stockpile. As such, much research effort is exerted to develop a comprehensive understanding of all the major components of a neutron generator. One of the key components is the tritium containing target. The target is a thin metal tritide film. Sandia's research into metal tritides began in the early 1960's with a collaboration with the Denver Research Institute (DRI) and contin… more
Date: May 1, 2008
Creator: Browning, James Frederick (Oak Ridge National Laboratory, Oak Ridge, TN); Kammler, Daniel R.; Snow, Clark Sheldon; Ferrizz, Robert Matthew; Rodriguez, Mark Andrew; Wixom, Ryan R. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Using a dynamic point-source percolation model to simulate bubble growth.

Description: Accurate modeling of nucleation, growth and clustering of helium bubbles within metal tritide alloys is of high scientific and technological importance. Of interest is the ability to predict both the distribution of these bubbles and the manner in which these bubbles interact at a critical concentration of helium-to-metal atoms to produce an accelerated release of helium gas. One technique that has been used in the past to model these materials, and again revisited in this research, is percolat… more
Date: May 1, 2004
Creator: Zimmerman, Jonathan A.; Zeigler, David A. & Cowgill, Donald F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Helium nano-bubble evolution in aging metal tritides.

Description: A continuum-scale, evolutionary model of helium (He) nano-bubble nucleation, growth and He release for aging bulk metal tritides is presented which accounts for major features of the experimental database. Bubble nucleation, modeled as self-trapping of interstitially diffusing He atoms, is found to occur during the first few days following tritium introduction into the metal and is sensitive to the He diffusivity and pairing energy. An effective helium diffusivity of 0.3 x 10{sup -16} cm{sup 2}… more
Date: May 1, 2004
Creator: Cowgill, Donald F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Total Cross Sections of Tritium, Hydrogen, and Helium for Fast Neutrons

Description: Abstract: "By using gaseous samples in neutron transmission experiments the total cross section of tritium has been measured over the energy region from 0.3 to 7.0 Mev and at the following additional energies: 14.1, 18.0, 19.1, and 20.0 Mev. A plot of cross section versus neutron energy shows a broad maximum with the greatest value of 2.5 barns at 3.7 Mev. Cross sections for helium were measured in the energy region from 1 to 3 Mev and for both hydrogen and helium at 14.1 Mev."
Date: October 1952
Creator: Coon, J. H.; Bondelid, R. O. & Phillips, D. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Vacuum Probe, Standard Leaks, and Needle Valve for Use with the Helium Leak Detector

Description: The following report is split into four parts describing the usage of a vacuum probe for leak hunting with the Helium Leak Detector, the two types of Standard Leaks that were designed to measure the sensitivity of the detector, the development of a needle valve adjusted for controlling the flow of a standard mixture of helium and air into the leak detector for a sensitivity check by the single leak method, and a worm and gear adjustment developed to facilitate throttling of the Helium Leak Dete… more
Date: August 1945
Creator: Samuel, A. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Helium-Bearing Natural Gases of the United States: Analyses and Analytical Methods

Description: Report published by the U.S. Bureau of Mines containing the results of a survey of the natural gas resources available in the United States. From the summary:"The Results of a Bureau of Mines survey of helium resources are given in this report and comprise gas analyses and accompanying data on more than 2,100 samples that have been collected in 30 States. The survey to determine the Nation's helium resources has been carried on in all natural-gas-producing areas of the United States since the… more
Date: 1951
Creator: Anderson, C. C. & Hinson, H. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Helium-Bearing Natural Gases of the United States: Analyses, Second Supplement to Bulletin 486

Description: Supplementary report from the U.S. Bureau of Mines regarding the results of a survey of the natural gas (helium) resources available in the United States. From the summary: "Results of analyses by the Bureau of Mines of 1,444 samples from oil and gas wells and natural gas pipelines collected from 23 states are presented in the Bulletin in tabular form. The information is from samples collected in the period May 1956 to January 1961 and supplements earlier publications" (p. 1). The summary al… more
Date: 1963
Creator: Munnerlyn, R. D. & Miller, R. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Helium-Bearing Natural Gases of the United States: Analyses and Analytical Methods, Supplement to Bulletin 486

Description: Supplementary report from the U.S. Bureau of Mines regarding the results of a survey of the natural gas (helium) resources available in the United States. From the summary: "Certain source data and results of analysis pertinent to 1,575 gas samples, which have been obtained from 26 States, Alaska, and Canada (only a few from the latter 2 regions) and analyzed in connection with the helium-survey program of the Bureau of Mines, are presented in tabular form. This publication is supplementary t… more
Date: 1958
Creator: Boone, W. J., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The 1958 He4 Scale of Temperatures: Part 1. Introduction, Part 2. Tables for the 1958 Temperature Scale

Description: Report containing information regarding He4 vapor pressure measurement as of 1958, the recent history of the vapor pressure temperature scale, and a series of tables containing these measurements.
Date: June 17, 1960
Creator: Brickwedde, F. G. (Ferdinand Graft), 1903-; van Dijk, H.; Durieux, M.; Clement, J. R. & Logan, J. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Study of Minority Atomic Ion Recombination in the Helium Afterglow

Description: Electron-ion recombination has been under study for many years, but comparisons between theory and experiment have been very difficult, especially for conditions where the ion under evaluation was a minority in concentration. This study describes a direct measurement of the recombination-rate coefficient for the recombination of minority as well as majority ions in the afterglow.
Date: August 1972
Creator: Wells, William E.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

The Air-Launched Balloon System (ALBS) Development Program, Phase 2

Description: Abstract: The circumstances leading to the second phase of the Air-Launched Balloon System Development Program are described, along with the governing design constraints. Individual component development efforts and system design modifications are described in turn: the procurement and testing of the new dewar, the qualification of the updated cryogenic unit recovery system. The complicated command, control, and telemetry subsystem is also described in detail. The results of component tests and… more
Date: December 15, 1981
Creator: Carten, Andrew S., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen