Resource Type

Partner

Collection

Serial/Series Title

Degree Department

Degree Discipline

Degree Level

Country

States

Counties

Year

Month

Day

Language

1,463 Matching Results

Start Over Year 1991 Month August Language English

Results open in a new window/tab.

Results: 1 - 24 of 1,463 next

(open access)

D-0 End Calorimeter Warm Tube/TeV Dry Air Purge

This Engineering Note studies the design of the Dry Air Purge that is going to flow through the Warm Tube of the End Calorimeter of the D-O Calorimeter. The Tev tubes through the E.C. can be thought of as a cluster of concentric tubes: The Tev tube, the warm (vacuum vessel) tube, 15 layers of superinsulation, the cold (argon vessel) tube, and the Inner Hadronic center support tube. The Dry Air Purge will involve flowing Dry Air through the annular region between the Warm Tube and the Tev Beam Pipe. This air flow is intended to prevent condensation from forming in this region which could turn to ice under cryogenic temperatures. Any ice formed in this gap, could cause serious problems when these tubes are moved. The Air will flow through a Nylon Tube Fitting -1/4-inch I.D. to 1/8-inch male pipe thread (Cole Palmer YB-06465-15) see Drawing MC-295221 (Appendix A). This fitting will be attached to the Nylon 2-inch Tube-Wiper and Seal Assembly which is clamped to the ends of the Warm Tube (Appendix A). This note includes drawings and calculations that explain the setup of the Dry Air Purge and give the required information on the pressure drops through …

Date: August 14, 1991

Creator: Leibfritz, J. R.

Object Type: Report

System: The UNT Digital Library

(open access)

A 3-D adaptive mesh refinement algorithm for multimaterial gas dynamics

Adaptive Mesh Refinement (AMR) in conjunction with high order upwind finite difference methods has been used effectively on a variety of problems. In this paper we discuss an implementation of an AMR finite difference method that solves the equations of gas dynamics with two material species in three dimensions. An equation for the evolution of volume fractions augments the gas dynamics system. The material interface is preserved and tracked from the volume fractions using a piecewise linear reconstruction technique. 14 refs., 4 figs.

Date: August 12, 1991

Creator: Puckett, E. G. & Saltzman, J. S.

Object Type: Article

System: The UNT Digital Library

(open access)

5-Year Plan for Independent Living in Texas

Report that includes the progress of he plan, purpose of the revised plan, and outlines the goals and strategies of the 5 year plan for independent living in Texas.

Date: August 1991

Creator: Texas. State Living Council.

Object Type: Report

System: The Portal to Texas History

(open access)

A 500 kV Photoemission Electron Gun for the CEBAF FEL

The proposed FELs at CEBAF require an electron source delivering 120 pC bunches at a repetition rate of 7.485 MHz, corresponding to an average current of 0.9 mA. To meet this requirement we will employ a 500 kV DC photoemission electron gun to produce nominal 100 psec bunches of modest peak current. The subsequent injector system will bunch and accelerate this beam, producing 60 A, 2 psec bunches for the FELs. The photoemission gun will use a negative electron affinity GaAs photocathode, which provides good quantum efficiency and an adequate temporal response. The optical beam will be provided by a frequency doubled Nd:YLF laser system, actively mode locked to a subharmonic of the fundamental accelerator frequency. The principal technical difficulties associated with an electron source of this type involve the operating lifetime of the photocathode, and the operation of a high voltage gun in the presence of the alkali metals necessary to produce the photocathode. Various design a

Date: August 1, 1991

Creator: Sinclair, Charles

Object Type: Report

System: The UNT Digital Library

(open access)

15th Street News (Midwest City, Okla.), Vol. 20, No. 1, Ed. 1 Friday, August 30, 1991

Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.

Date: August 30, 1991

Creator: Kelly, Frank

Object Type: Newspaper

System: The Gateway to Oklahoma History

(open access)

1991 Yearly calibration of Pacific Northwest Laboratory's gross gamma-ray borehole geophysical logging system

This report describes the 1991 yearly calibration of a gross gamma-ray geophysical pulse logging system owned by the US Department of Energy (DOE) and operated by the Pacific Northwest Laboratory. The calibration was conducted to permit the continued use of this system for geologic and hydrologic studies associated with remedial investigations at the Hanford Site. Primary calibrations to equivalent uranium units were conducted in DOE borehole model standards that reside on the Hanford Site. The calibrations were performed in borehole models SBL/SBH and SBA/SBB, which contain low-equivalent uranium concentrations. Correlations were established based on two similar approaches for relating observed count rate in before- and after-logging field calibrations to equivalent uranium concentrations. A new field source (Ra-20S-82) was fabricated to replace the old source (Ra-20S-204), whose activity led to variable field calibration results previously caused by a nonfixed geometry. A cross-calibration study was performed to compare the operation of the new source relative to the old source. A digitally based collection/recording system was recently acquired, so that many of the procedures were performed with the old analog system and the new digital system to compare the performance of the digital system. 7 refs., 2 figs., 9 tabs.

Date: August 1, 1991

Creator: Arthur, R.J.

Object Type: Report

System: The UNT Digital Library

[2012.201.B0957.0072]

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "A forest of idle drilling rigs is part of the market strategy of Suits Rig Corp., Enid, which amassed a fleet of 71 rigs since the oil industry collapsed in 1982." Photograph is of thirteen modern oil rigs in an open field not in use.

Date: August 15, 1991

Creator: Gooch, Steve

Object Type: Photograph

System: The Gateway to Oklahoma History

[20th Annual Opening Ceremony]

Photograph of festival director Jo Ann Andera with former directors Claudia Ball and O. T. Baker at the opening ceremony of the 20th annual Texas Folklife Festival. Festival directors are lined up in front, backed by clusters of colorful balloons. On the left, a man is playing a large drum next to a man who is playing an accordion.

Date: August 1, 1991

Creator: Informedia

Object Type: Photograph

System: The Portal to Texas History

(open access)

Ab initio calculations on collisions of low energy electrons with polyatomic molecules

The Kohn variational method is one of simplest, and oldest, techniques for performing scattering calculations. Nevertheless, a number of formal problems, as well as practical difficulties associated with the computation of certain required matrix elements, delayed its application to electron--molecule scattering problems for many years. This paper will describe the recent theoretical and computational developments that have made the complex'' Kohn variational method a practical tool for carrying out calculations of low energy electron--molecule scattering. Recent calculations on a number of target molecules will also be summarized. 41 refs., 7 figs.

Date: August 1, 1991

Creator: Rescigno, T. N.

Object Type: Article

System: The UNT Digital Library

(open access)

Achieve!, August 15 1991

Periodic newsletter discussing information related to student drop-out rates, relevant legislative issues, and prevention programs. This issue focuses on the need to improve the educational technology in Texas.

Date: August 15, 1991

Creator: Texas Research League

Object Type: Journal/Magazine/Newsletter

System: The Portal to Texas History

(open access)

Acoustic emissions applications on the NASA Space Station

Acoustic emission is being investigated as a way to continuously monitor the space station Freedom for damage caused by space debris impact and seal failure. Experiments run to date focused on detecting and locating simulated and real impacts and leakage. These were performed both in the laboratory on a section of material similar to a space station shell panel and also on the full-scale common module prototype at Boeing's Huntsville facility. A neural network approach supplemented standard acoustic emission detection and analysis techniques. 4 refs., 5 figs., 1 tab.

Date: August 1, 1991

Creator: Friesel, M. A.; Dawson, J. F.; Kurtz, R. J.; Barga, R. S.; Hutton, P. H. & Lemon, D. K.

Object Type: Article

System: The UNT Digital Library

(open access)

Additional evidence on informational asymmetry at acquisition announcement

This dissertation examines the partial anticipation hypothesis by employing the bid-ask spread approach in market microstructure theory. Selecting the OTC bidding firms with a careful research design, this dissertation divides sample firms into firms with acquisition programs and firms without acquisition programs.

Date: August 1991

Creator: Kim, Young Kook

Object Type: Thesis or Dissertation

System: The UNT Digital Library

(open access)

Adult Age and Ethnicity as Factors in Success on the TASP : A Measurement of the Texas Academic Skills Program (TASP) Test

This study examined the association among ethnicity, age, and scores on selected portions of the TASP and MAPS tests. This study further examined if the TASP could identify students for success in college level course work as well or better than selected portion of the MAPS test.

Date: August 1991

Creator: Friedman, Linda A. (Linda Anne)

Object Type: Thesis or Dissertation

System: The UNT Digital Library

(open access)

(Advanced Coal Conversion Process Demonstration Project)

This project will demonstrate an advanced thermal coal drying process coupled with physical cleaning techniques to upgrade high-moisture, low-rank coals to produce a high-quality, low-sulfur fuel. The coal will be processed through two vibrating fluidized bed reactors that will remove chemically bound water, carboxyl groups, and volatile sulfur compounds. After drying, the coal will be put through a deep-bed stratifier cleaning process to effect separation of the pyrite rich ash. The process will enhance low-rank western coals, usually with a moisture content of 25--55%, sulfur content of 0.5--1.5%, and heating value of 5500--9000 Btu/lb by producing a stable, upgraded coal product with a moisture content as low as 1%, sulfur content as low as 0.3%, and heating value up to 12,000 Btu/lb. The 45 ton/hr unit will be located adjacent to a unit train loadout facility at Western Energy Company's Rosebud coal mine near the town of Colstrip in southeastern Montana. The demonstration plant is sized at about one-tenth the projected throughput of a multiple processing train commercial facility. The demonstration drying and cooling equipment is currently commercial size.

Date: August 1, 1991

Creator: unknown

Object Type: Report

System: The UNT Digital Library

(open access)

[Advanced Coal Conversion Process Demonstration Project]. Technical progress report, April 1, 1991--June 30, 1991

This project will demonstrate an advanced thermal coal drying process coupled with physical cleaning techniques to upgrade high-moisture, low-rank coals to produce a high-quality, low-sulfur fuel. The coal will be processed through two vibrating fluidized bed reactors that will remove chemically bound water, carboxyl groups, and volatile sulfur compounds. After drying, the coal will be put through a deep-bed stratifier cleaning process to effect separation of the pyrite rich ash. The process will enhance low-rank western coals, usually with a moisture content of 25--55%, sulfur content of 0.5--1.5%, and heating value of 5500--9000 Btu/lb by producing a stable, upgraded coal product with a moisture content as low as 1%, sulfur content as low as 0.3%, and heating value up to 12,000 Btu/lb. The 45 ton/hr unit will be located adjacent to a unit train loadout facility at Western Energy Company`s Rosebud coal mine near the town of Colstrip in southeastern Montana. The demonstration plant is sized at about one-tenth the projected throughput of a multiple processing train commercial facility. The demonstration drying and cooling equipment is currently commercial size.

Date: August 1, 1991

Creator: unknown

Object Type: Report

System: The UNT Digital Library

(open access)

Advancing liquid metal reactor technology with nitride fuels

A review of the use of nitride fuels in liquid metal fast reactors is presented. Past studies indicate that both uranium nitride and uranium/plutonium nitride possess characteristics that may offer enhanced performance, particularly in the area of passive safety. To further quantify these effects, the analysis of a mixed-nitride fuel system utilizing the geometry and power level of the US Advanced Liquid Metal Reactor as a reference is described. 18 refs., 2 figs., 2 tabs.

Date: August 1, 1991

Creator: Lyon, W.F.; Baker, R.B.; Leggett, R.D. (Westinghouse Hanford Co., Richland, WA (United States)) & Matthews, R.B. (Los Alamos National Lab., NM (United States))

Object Type: Report

System: The UNT Digital Library

(open access)

The Age, Volume [12], Number 8, August 1991

Monthly publication containing information related to Chambers County, Texas, including current events of the Chambers County Historical Commission, the Wallisville Heritage Park, and the Chambers County historical and genealogical societies; reprinted newspaper articles about county events and citizens; and historical news and records.

Date: August 1991

Creator: Wallisville Heritage Park (Organization)

Object Type: Journal/Magazine/Newsletter

System: The Portal to Texas History