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71,874 Matching Results

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Results: 1 - 24 of 71,874 next

(open access)

Measurement of energy deposited by charged-particle beams in composite targets

We have measured the energy deposited in two types of composite targets by a number of charged-particle beams: targets made of /sup 238/U, Lucite, and polyethylene were exposed to 0.26-GeV protons and 0.33-GeV deuterons, and aluminum-Lucite composites were exposed to 0.5-GeV electrons. In addition, we measured neutrons and gamma rays emitted from solid targets of various materials (including /sup 238/U and iron) exposed to 0.26-GeV protons and 0.33-GeV deuterons. We used passive detectors (thermoluminescence dosimeters, Lexan fission track recorders, and photographic emulsions) to measure the nonfission dose and the fission-fragment dose from the primary beam and its shower of products. Measurements were made at various depths and radial positions in the targets. Plots and numerical values of the measured doses are presented. The emission of neutrons and gamma rays was measured with a liquid-deuterated-benzene detector. In general, the dose profile with depth is similar for 0.26-GeV protons and 0.33-GeV deuterons. The ratio of return neutrons to gamma rays increases with increasing target mass number. Deuterons, however, produce from 1.7 to 5.8 times as many neutrons and gamma rays per particle as do protons.

Date: July 2, 1980

Creator: Farley, E.; Becker, J.; Crase, K.; Howe, R. & Selway, D.

Object Type: Report

System: The UNT Digital Library

(open access)

Least cost planning from a customer's perspective

In this paper, I offer some thoughts about least cost planning, not from the perspective of the regulator or utility, but from the perspective of a residential customer. The problem that I address is, as a homeowner in northern Virginia, I am about to make a long term fuel choice for my household, where the options include, natural gas, electricity and fuel oil. An additional choice is the energy efficiency capital investment in my home that could decrease my monthly fuel costs. My decision process, hopefully as a rational consumer, offers implications about the efficiency of various services provided by all three fuel suppliers, including the local natural gas distribution companies (LDC).

Date: March 2, 1992

Creator: Sutherland, R.J.

Object Type: Article

System: The UNT Digital Library

(open access)

Some general properties of stimulated Raman propagation with pump depletion, transiency and dispersion

This note considers some of the properties of the Stokes pulse that grows from a specified seed pulse in the presence of a strong pump pulse as it propagates through a dispersive atomic vapor. We first present an generic dimensionless form for the coupled equations that govern the propagation of pump and Stokes fields or collinear plane-wave pulses. By treating the two fields we permit pump depletion. We include transient atomic response (as embodied in the Raman coherence), but neglect changes in atomic populations. (Thus our equations pertain to the regime in which atoms are more numerous than photons). The equations employ a gain length, a dispersion time {tau}{sub dis}, and a Raman coherence time (or memory time) {tau}{sub R} as basic parameters: these two times, together with a single-photon stationary-atom detuning {Delta}, subsume the details of a particular atomic Raman transition and particular operating conditions. (The effects of Doppler shifts enters the equations through the coherence time). We discuss some general properties of these generic Raman propagation equations, and present illustrations of their solutions in the absence of dispersion. We comment on departures from exponential growth. We than show examples of behavior when dispersion is present and the pump …

Date: August 2, 1991

Creator: Shore, B. W.; Lowder, S. & Johnson, M. A.

Object Type: Report

System: The UNT Digital Library

(open access)

Constitutionality of President and Vice President Bring Residents of the Same State

This report addresses the constitutionality of the president and vice president being residents of the same state.

Date: August 2, 1968

Creator: Yadlosky, Elizabeth

Object Type: Report

System: The UNT Digital Library

(open access)

Congressional Organization for Science and Technology, 91st Congress, 2nd Session: A Listing of Congressional Committees and Subcommittees Having Jurisdiction over Scientific and Technological Activities

This report provides a listing of congressional committees and subcommittees related to science and technology.

Date: March 2, 1970

Creator: Ayton, Mauree W.

Object Type: Report

System: The UNT Digital Library

(open access)

Nuclear-Powered U.S. Naval Vessels: Authorizations policy and problems

This report is categorized into three categories: (I) Previous authorizations of nuclear-powered naval vessels, (II) Present Policy toward nuclear-powered naval vessels and (III) CESA and naval nuclear populsion.

Date: April 2, 1969

Creator: Stillson, Albert C.

Object Type: Report

System: The UNT Digital Library

(open access)

[News Script: Airport]

Script from the WBAP-TV/NBC station in Fort Worth, Texas relating a news story.

Date: October 2, 1968

Creator: WBAP-TV (Television station : Fort Worth, Tex.)

Object Type: Script

System: The UNT Digital Library

(open access)

[News Script: Hockey]

Script from the WBAP-TV/NBC station in Fort Worth, Texas relating a news story.

Date: March 2, 1969

Creator: WBAP-TV (Television station : Fort Worth, Tex.)

Object Type: Script

System: The UNT Digital Library

(open access)

[News Script: Grand jury]

Script from the WBAP-TV/NBC station in Fort Worth, Texas relating a news story.

Date: October 2, 1968

Creator: WBAP-TV (Television station : Fort Worth, Tex.)

Object Type: Script

System: The UNT Digital Library

(open access)

[News Script: Russia-China]

Script from the WBAP-TV/NBC station in Fort Worth, Texas relating a news story.

Date: March 2, 1969

Creator: WBAP-TV (Television station : Fort Worth, Tex.)

Object Type: Script

System: The UNT Digital Library

(open access)

[RE: October Directors' and Funder's Meetings, September 2, 1993]

Photocopy of a letter from Vicki Rosenberg, program officer for the Getty Center, to the Regional and Californian Institute Directors. In regards to the postponing the Funder's Meeting due to the poor RSVP response to the Center's invitations. The Center has plans to reschedule the meeting sometime after July 1, 1994, and as a result the Center is also cancelling the Resource Room. Copied on the letter are, Ann Bassi, Leilani Lattin Duke, Val Marmillion, Natalie Sterba, Blanche Rubin and Brent Wilson.

Date: September 2, 1993

Creator: Rosenberg, Vicki

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter from Jack Davis and Bill McCarter to E.A. Carmean, April 2, 1990]

Photocopy of a letter from Jack Davis and Bill McCarter, co-directors of North Texas Institute for Educators on the Visual Arts, to E.A Carmean, Director of the Modern Art Museum of Fort Worth. Thanking him for graciously agree to be chair of the Advisory Committee for the North Texas Institute for Educators on the Visual Arts. Davis and McCarter writes that being a member of the advisory committee they will periodically review the activities of the Institute and serve as liaison between the community and the Institute, which serves as stepping stone towards comprehensive visual arts program being integrated in school districts. Included in the letter are details about what to expect from being a committee member and the types of meetings they hope to have during the following year. Davis and McCarter write that they are excited about the opportunity to improve the quality of visual arts for students and develop a more informed audience. The letter states that enclosed are a list of people who have been invited to participate as committee members as well as a packet of materials that were sent to them. The list and materials are not present with the letter.

Date: April 2, 1990

Creator: Davis, Donald Jack & McCarter, William

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter from Nancy Reynolds to Vicki Rosenberg, February 2, 1994]

Photocopy of a letter from Nancy Reynolds, Project Coordinator of North Texas Institute for Educators on the Visual Arts, to Vicki Rosenberg, Program Officer for the Getty Center. In regards to the expenditures for NTIEVA's cost for their participation in the RIGs exhibition at NAEA conference in Baltimore. Reynolds says that they do not expect all costs to be covered by the Getty Center but are informing them of their estimated costs.

Date: February 2, 1994

Creator: Raynolds, Nancy

Object Type: Letter

System: The UNT Digital Library

(open access)

Environment, Natural Resources and Population

This report includes Findings and recommendations of a study about Environment, Natural Resources and Population conducted by the committee on Resources and Man of the National Academy of Sciences-National Research Council (NAS-NRC).

Date: May 2, 1969

Creator: Bowman, Wallace D.

Object Type: Report

System: The UNT Digital Library

(open access)

Analysis of oxygen on and in beryllium using 2 MeV helium ions

Analysis of oxygen on beryllium can be routinely performed using helium-ion backscattering (RBS). However, determination of the bulk oxygen concentration by this technique is limited to about 350 atomic parts per million (appM). We have performed simultaneous RBS and particle-induced x-ray emission (PIXE) measurements to improve the detection limit for bulk oxygen. The RBS measurements allowed determination of the surface oxygen before and after in-situ sputter cleaning by argon ions in an ultra-high-vacuum system. PIXE measurements of specimens with surfaces maintained clean by sputtering permitted assessment of the concentration of oxygen in the bulk. For our geometry and detector sensitivities, 90% of the oxygen x-ray signal originated in the first 2.1 ..mu..m of the beryllium and a detection limit of 10 appM was found. 12 refs., 3 figs.

Date: October 2, 1986

Creator: Musket, R.G.

Object Type: Article

System: The UNT Digital Library

(open access)

Piqua Nuclear Power Facility Radiological Surveillance Program

Results of the annual radiological survey of the retired Piqua Nuclear Facility in Piqua, Ohio are presented in this report. The overall survey did not reveal the existence of any significant changes within the facility. This survey marked the inception of a surface soil sampling program. Analysis of the soil revealed that concentrations of radioactivity are comparable to those found at other locations in Ohio. (DMC)

Date: March 2, 1982

Creator: unknown

Object Type: Report

System: The UNT Digital Library

(open access)

Enhanced durability and reactivity for zinc ferrite desulfurization sorbent

AMAX Research Development Center (AMAX R D) has been investigating methods for enhancing the reactivity and durability of the zinc ferrite desulfurization sorbent. Zinc ferrite sorbents are intended for use in desulfurization of hot coal gas in integrated gasification combined cycle (IGCC) or molten carbonate fuel cell (MCFC) applications. For the present program, the reactivity of the sorbent may be defined as its sulfur sorption capacity at the breakthrough point and at saturation in a bench-scale, fixed-bed reactor. Durability may be defined as the ability of the sorbent to maintain important physical characteristics such As size, strength, and specific surface area during 10 cycles of sulfidation and oxidation.

Date: May 2, 1989

Creator: Jha, M. C. & Berggren, M. H.

Object Type: Report

System: The UNT Digital Library

(open access)

Ranking energy-conservation measures to establish research priorities: synopsis of a workshop

A workshop was convened to assist DOE's Technology Assessment Division in evaluating the need to prepare additional environmental- and social-impact assessments of different energy-conservation measures. Attendees participated in a decision-making exercise designed to rank 19 different energy-conservation measures according to their overall potential for achieving important national goals and their ease of implementation. The participants felt that the most-important ranking criteria dealt with questions concerning feasibility (economic, political/institutional, social, and technical) and economic efficiency. Other criteria, such as environmental quality and occupational health and safety received lower weights; possibly because of the widespread belief that most of the conservation measures presented would be environmentally beneficial. In the participants' view, the most-promising and feasible conservation measures include new-building-performance standards, retrofit of existing housing stock, new-appliance-performance standards and increased use of smaller cars. In contrast, conservation options which ranked rather low, such as diesel engines, coal-fired aluminum remelt furnaces, and cupola furnace modifications were expected to have some harmful environmental and health impacts. Most of these impacts are expected to be highly localized and of lesser national concern. Disagreement exists as to the efficacy of funding those projects deemed highly desirable and feasible versus those which are expected to have the greater …

Date: May 2, 1979

Creator: Moskowitz, P.D.; Le, T.Q. & Pierce, B.

Object Type: Report

System: The UNT Digital Library

(open access)

Development and testing of an air quality model for Mexico City

Los Alamos National Laboratory and Instituto Mexicano del Petroleo have embarked on a joint study of options for improving air quality in Mexico City. The intent is to develop a modeling system which can address the behavior of pollutants in the region so that option for improving Mexico City air quality can be properly evaluated. In February of 1991, the project conducted a field program which yielded a variety of data which is being used to evaluate and improve the models. Normally the worst air quality for both primary and photochemical pollutants occurs in the winter Mexico City. During the field program, measurements included: (1) lidar measurements of aerosol transport and dispersion, (2) aircraft measurements of winds, turbulence, and chemical species aloft, (3) aircraft measurements of earth surface skin temperatures, and (4) tethersonde measurements of wind, temperature and ozone vertical profiles. A three-dimensional, prognostic, higher order turbulence meteorological model (HOTMAC) was modified to include an urban canopy and urban heat sources. HOTMAC is used to drive an Monte-Carlo kernel dispersion code (RAPTAD). HOTMAC also provides winds and mixing heights for the CIT photochemical model which was developed by investigators at the California Institute of Technology and Carnegie Mellon University.

Date: March 2, 1992

Creator: Williams, M. D.; Streit, G. (Los Alamos National Lab., NM (United States)); Cruz, X.; Ruiz, M.; Sosa, G. (Instituto Mexicano de Petroleo, Mexico City (Mexico)); Russell, A. G. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Weak interaction effects in e/sup +/e/sup -/ annihilation with polarised beams

Although the standard gauge model of weak and electromagnetic interactions based on the work of Salam and Weinberg has met with great success, there are experimental facts that will require its extension or its modification to a new gauge model; the discovery of a heavy lepton at SLAC and the absence of parity violation in atoms that is expected from the neutral weak current coupling to electrons are discussed. Three tests are proposed that bear on these questions. First, heavy lepton production in e/sup +/e/sup -/ annihilation when one of the incident beams is longitudinally polarized is considered and the purely leptonic decay of this heavy lepton is examined. An asymmetry in the inclusive angular distribution of one charged lepton (electron or muon) is important in determining the structure of weak interactions of the heavy lepton. In fact, this angular asymmetry easily distinguishes between the cases V - A and V + A for the heavy lepton current. Then, the decay channel L ..-->.. ..nu../sub L/ + one hadron is considered (L = heavy lepton) under the same experimental set-up and the inclusive one-hadron angular distribution examined. Parity nonconservation in the decay of the heavy lepton causes a conspicuous forward-backward …

Date: November 2, 1977

Creator: Simard, R.

Object Type: Report

System: The UNT Digital Library

(open access)

Enhanced Durability and Reactivity for Zinc Ferrite Desulfurization Sorbent

AMAX Research Development Center (AMAX R D) has been investigating methods for enhancing the reactivity and durability of the zinc ferrite desulfurization sorbent. Zinc ferrite sorbents are intended for use in desulfurization of hot coal gas in integrated gasification combined cycle (IGCC) or molten carbonate fuel cell (MCFC) applications. For the present program, the reactivity of the sorbent may be defined as its sulfur sorption capacity at the breakthrough point and at saturation in a bench-scale, fixed-bed reactor. Durability may be defined as the ability of the sorbent to maintain important physical characteristics such as size, strength, and specific surface area during 10 cycles of sulfidation and oxidation.

Date: May 2, 1989

Creator: Silaban, A. & Harrison, D.P.

Object Type: Report

System: The UNT Digital Library

(open access)

Corrosion and scaling by steam in nuclear geothermal power plants

None

Date: June 2, 1972

Creator: Krikorian, O.H.

Object Type: Report

System: The UNT Digital Library

(open access)

Recovery and reuse of asphalt roofing waste. Final report

Burning of asphalt roofing waste as a fuel and incorporating asphalt roofing waste in bituminous paving were identified as the two outstanding resource recovery concepts out of ten studied. Four additional concepts might be worth considering under different market or technical circumstances. Another four concepts were rated as worth no further consideration at this time. This study of the recovery of the resource represented in asphalt roofing waste has identified the sources and quantities of roofing waste. About six million cubic yards of scrap roofing are generated annually in the United States, about 94% from removal of old roofing at the job site and the remainder from roofing material production at factories. Waste disposal is a growing problem for manufacturers and contractors. Nearly all roofing waste is hauled to landfills at a considerable expense to roofing contractors and manufacturers. Recovery of the roofing waste resource should require only a modest economic incentive. The asphalt contained in roofing waste represents an energy resource of more than 7 x 10/sup 13/ Btu/year. Another 1 x 10/sup 13/ Btu/year may be contained in field-applied asphalt on commercial building roofs. The two concepts recommended by this study appear to offer the broadest applicability, the …

Date: February 2, 1984

Creator: Desai, S.; Graziano, G. & Shepherd, P.

Object Type: Report

System: The UNT Digital Library

(open access)

Fusion power demonstration - a baseline for the mirror engineering test reactor

Developing a definition of an engineering test reactor (ETR) is a current goal of the Office of Fusion Energy (OFE). As a baseline for the mirror ETR, the Fusion Power Demonstration (FPD) concept has been pursued at Lawrence Livermore National Laboratory (LLNL) in cooperation with Grumman Aerospace, TRW, and the Idaho National Engineering Laboratory. Envisioned as an intermediate step to fusion power applications, the FPD would achieve DT ignition in the central cell, after which blankets and power conversion would be added to produce net power. To achieve ignition, a minimum central cell length of 67.5 m is needed to supply the ion and alpha particles radial drift pumping losses in the transition region. The resulting fusion power is 360 MW. Low electron-cyclotron heating power of 12 MW, ion-cyclotron heating of 2.5 MW, and a sloshing ion beam power of 1.0 MW result in a net plasma Q of 22. A primary technological challenge is the 24-T, 45-cm bore choke coil, comprising a copper hybrid insert within a 15 to 18 T superconducting coil.

Date: December 2, 1983

Creator: Henning, C. D.; Logan, B. G.; Neef, W. S.; Dorn, D.; Clarkson, I. R.; Carpenter, T. et al.

Object Type: Article

System: The UNT Digital Library

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