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2,655 Matching Results

Start Over Year 1996 Month September

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Results: 1 - 24 of 2,655 next

(open access)

Color coherence in p pbar collisions at squareroot s = 1.8 TeV

We report on two preliminary studies of color coherence effects on {ital p}{ital {anti p}} collisions based on data collected by the D{null} detector during the 1992-1993 and 1994-1995 runs at the Fermilab Tevatron collider at a center of mass energy {radical}s = 1. 8 TeV. Demonstration of initial-to-final state color interference effects is done in a higher energy region by measuring spatial correlations between the softer third jet and the second leading- {ital E}{sub {ital T}} jet in multi-jet events and in a lower energy regime by examining particle distribution patterns in W+Jet events. The data are compared to Monte Carlo simulations with different color coherence implementations and the predictions of an NLO parton level calculation.

Date: September 1, 1996

Creator: Abachi, S.

Object Type: Article

System: The UNT Digital Library

(open access)

Search for chargino-neutralino associated production via trileptonic final states with DO detector

Preliminary results from a search for the production of an associated lightest chargino, W{sub 1}, and second lightest neutralino, Z{sub 2}, pair with the D0 detector at Fermilab`s pp collider with {radical}s = 1.8 TeV are presented. Based on approximately 85 pb{sup -1} of data collected during the 1993-1995 Tevatron Runs we set a 95% C.L. upper limit on the chargino-neutralino cross section times branching fraction to any trileptonic final state ranging from 0.91 pb to 0.19 pb for wino masses ranging from 45 GeV/c{sup 2} to 96 GeV/c{sup 2}.

Date: September 1, 1996

Creator: Abachi, S.; Ahn, S.; Baldin, B. & Bhat, P.C.

Object Type: Article

System: The UNT Digital Library

(open access)

[Letter to Phillip C. Diebel from Julie Anne Abel - September 3, 1996]

A letter to Phillip C. Diebel from Julie Anne Abel regarding a grant check from the Getty Education Institute for the Arts to the North Texas Institute for Educators on the Visual Arts (NTIEVA).

Date: September 3, 1996

Creator: Abel, Julie A.

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter from Julie Anne Abel to R. William McCarter, September 12, 1996]

A letter from Julie Anne Abel to R. William McCarter about enclosing two copies of The Getty Center for Education in the Arts grant offer letter for the North Texas Institute for Educators on the Visual Arts for the use of creating and maintaining a database of past professional development programs. The offer letters are not attached to the document.

Date: September 12, 1996

Creator: Abel, Julie Anne

Object Type: Letter

System: The UNT Digital Library

(open access)

The design and performance of the research reactor fuel counter

This paper describes the design features, hardware specifications, and performance characteristics of the Research Reactor Fuel Counter (RRFC) System. The system is an active mode neutron coincidence counter intended to assay material test reactor fuel assemblies under water. The RRFC contains 12 {sup 3}He tubes, each with its own preamplifier, and a single ion chamber. The neutron counting electronics are based on the Los Alamos Portable Shift Register (PSR) and the gamma readout is a manual-range pico-ammeter of Los Alamos design. The RRFC is connected to the surface by a 20-m-long cable bundle. The PSR is controlled by a portable IBM computer running a modified version of the Los Alamos neutron coincidence counting code also called RRFC. There is a manual that describes the RRFC software.

Date: September 1, 1996

Creator: Abhold, M. E.; Hsue, S. T.; Menlove, H. O.; Walton, G. & Holt, S.

Object Type: Report

System: The UNT Digital Library

(open access)

Abilene Philharmonic Playbill: September 14, 1996

Program for an Abilene Philharmonic concert that ran from September 14th to September 28th, 1996 during the 47th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.

Date: September 1996

Creator: Abilene Philharmonic

Object Type: Pamphlet

System: The Portal to Texas History

(open access)

Analysis of experimental hydrogen engine data and hydrogen vehicle performance and emissions simulation

This paper reports the engine and vehicle simulation and analysis done at Lawrence Livermore (LLNL) as a part of a joint optimized hydrogen engine development effort. Project participants are: Sandia National Laboratory, California (SNLC), responsible for experimental evaluation; Los Alamos National Laboratory (LANL), responsible for detailed fluid mechanics engine evaluations, and the University of Miami, responsible for engine friction reduction. Fuel cells are considered as the ideal power source for future vehicles, due to their high efficiency and low emissions. However, extensive use of fuel cells in light-duty vehicles is likely to be years away, due to their high manufacturing cost. Hydrogen-fueled, spark-ignited, homogeneous-charge engines offer a near-term alternative to fuel cells. Hydrogen in a spark-ignited engine can be burned at very low equivalence ratios, so that NO{sub x} emissions can be reduced to less than 10 ppm without catalyst. HC and CO emissions may result from oxidation of engine oil, but by proper design are negligible (a few ppm). Lean operation also results in increased indicated efficiency due to the thermodynamic properties of the gaseous mixture contained in the cylinder. The high effective octane number of hydrogen allows the use of a high compression ratio, further increasing engine efficiency.

Date: September 1996

Creator: Aceves, S. M.

Object Type: Article

System: The UNT Digital Library

(open access)

A desiccant dehumidifier for electric vehicle heating

Vehicle heating requires a substantial amount of energy. Engines in conventional cars produce enough waste heat to provide comfort heating and defogging/defrosting, even under very extreme conditions. Electric vehicles (EVs), however, generate little waste heat. Using battery energy for heating may consume a substantial fraction of the energy storage capacity, reducing the vehicle range, which is one of the most important parameters in determining EV acceptability. Water vapor generated by the vehicle passengers is in large part responsible for the high heating loads existing in vehicles. In cold climates, the generation of water vapor inside the car may result in water condensation on the windows, diminishing visibility. Two strategies are commonly used to avoid condensation on windows: windows are kept warm, and a large amount of ambient air is introduced in the vehicle. Either strategy results in a substantial heating load. These strategies are often used in combination, and a trade-off exists between them. If window temperature is decreased, ventilation rate has to be increased. Reducing the ventilation rate requires an increase of the temperature of the windows to prevent condensation. An alternative solution is a desiccant dehumidifier, which adsorbs water vapor generated by the passengers. Window temperatures and ventilation …

Date: September 1996

Creator: Aceves, S. M. & Smith, J. R.

Object Type: Article

System: The UNT Digital Library

(open access)

Monitoring the Migrations of Wild Snake River Spring/Summer Chinook Salmon Smolts, 1994-1995 Progress (Annual) Report.

We PIT tagged wild spring/summer chinook-salmon parr in the Snake River Basin in 1994 and subsequently monitored these fish during their smolt migration through Lower Granite, Little Goose, Lower Monumental, McNary, John Day, and Bonneville Darns during spring, summer, and fall 1995. This report details our findings. The goals of this study are to (1) characterize the migration timing of different wild stocks of Snake River spring/summer chinook salmon smolts at dams on the Snake and Columbia Rivers, (2) determine if consistent patterns are apparent, and (3) determine what environmental factors influence migration timing.

Date: September 1, 1996

Creator: Achord, Stephen

Object Type: Report

System: The UNT Digital Library

(open access)

Engineering study TWRS privatization phase I roads and rail system modifications

The DOE-RL is pursuing a new business strategy of hiring private contractors for treatment of Hanford Site tank wastes. This strategy is called privatization and includes design, permitting , construction, operation and deactivation of facilities for tank waste treatment. The TWRS Privatization Infrastructure Project is part of the first phase of the initiative. It consists of several sub-projects which will provide key physical interfaces and services needed to support the privatization mission. One sub-project is to establish transport system changes needed to support the privatization initiative. Specifically, this study identifies the road and rail system modifications needed to service the privatization site in 2OOE; an area previously developed and characterized for Grout Disposal.

Date: September 30, 1996

Creator: Ackerman, R. L.

Object Type: Report

System: The UNT Digital Library

(open access)

Operational tips for improving intrusion detection system performance

The installation of a new intrusion detection system (IDS) is, of course, expected to improve site security. However, depending upon the way the system is used, it can, over time, actually degrade security. Proper use, control, and maintenance of the IDS is critical if site security is to be maintained. This paper discusses several operational issues that should be addressed in order to use an IDS effectively. Several anecdotes from the author`s experience are given to illustrate proper and improper use of an IDS. Improper operational use of an IDS can render it ineffective. Applying these tips can help keep the IDS operating at peak performance.

Date: September 1, 1996

Creator: Adams, D.G.

Object Type: Article

System: The UNT Digital Library

(open access)

An annunciator architecture for the year 2000

Exciting new safeguards and security technologies are on the horizon, and some are even on the shelves today. Self-testing sensors, smart sensors, and intelligent alarm analyzers are all designed to provide useful information to the operator. However, today`s current annunciator systems were not designed to accommodate these new technologies. New display technologies are also changing the look and feel of the annunciator of the future. Annunciator technology needs to ``catch up` to these other security technologies. This paper presents the concept for a new, object-oriented approach to annunciator architecture design. The new architecture could accommodate simple, switch-closure devices as well as information- rich sensors and intelligent analyzers. In addition the architecture could allow other leading-edge interfaces to be easily integrated into the annunciator system. These technologies will reduce operator workload and aid the operator in making informed security decisions. 3 refs., 2 figs.

Date: September 1, 1996

Creator: Adams, D.G.; Fitzgerald, D.S. & Ortiz, S.

Object Type: Article

System: The UNT Digital Library

(open access)

Current challenges in contaminant effects monitoring: Multiple stressors and ecological significance

Aquatic ecosystems are complex entities that are controlled and regulated by a multitude of physicochemical and biological processes. In addition, aquatic organisms experience a variety of natural and man-induced stressors, both of which vary spatially and temporally. The high variability in environmental factors combined with synergistic and cumulative interactions of these factors in aquatic ecosystems complicate the interpretation and evaluation of the effects of contaminant-related stressors on organisms. With this in mind, some main challenges facing those concerned with assessing the effects of environmental contaminants on organisms are (1) the influence of multiple stressors on stress responses in biological systems, (2) determining causal relationships between various levels of biological response to stressors, and (3) identifying early warning indicators or measures of organism impairment that have biological significance before irreversible or serious disability occurs. In all these areas, the health of biological systems (from the individual level to the population and community levels) has as its basis the physiological performance of the organism. Therefore, aspects of contaminant effects monitoring which include physiological measures of health should not only be utilized as measures of deviations from normal function, but should also be applied in the larger context of helping to understand multiple …

Date: September 1996

Creator: Adams, S. M. & Ham, K. D.

Object Type: Article

System: The UNT Digital Library

(open access)

Evaluation/disposition of observations no. 6-17, 6-18, and 6-22 from site electrical assessment report, 300 area powerhouse and emergency sys.

Disposition of Observations 6-17, 6-18, 6-22 of Site Electrical Assessment Report. Application of generator differential protection, and synchro-check relay rewiring for generators of building 3621-D. In 1990, the WHC Site Electrical Task Group issued a Site Electrical Assessment Report, ``300 Area Powerhouse and Emergency System.`` This report included numerous findings and observations relating to observed deficiencies or opportunities for improvement in maintenance of the inspected electrical systems. The purpose of this letter report is to provide an evaluation and proposed disposition of Observations No. 6-1 7, 6-1 8, and 6-22 of the Site Electrical Assessment Report.

Date: September 30, 1996

Creator: Ahola, E.L.

Object Type: Report

System: The UNT Digital Library

(open access)

Fischer-Tropsch synthesis in supercritical fluids. Quarterly technical progress report, January 1, 1996--March 31, 1996

Our objective in this quarter was to develop an equation to predict the molecular coefficients to a high degree of accuracy so we may be able to predict both the molecular diffusion coefficient and thus the effective diffusivity a priori. To accomplish this task we developed a correlation between the molecular dynamic simulations and semi- empirical correlation. A DEC alpha station was purchased for aid in this endeavor. With the new workstation the theory can be fully checked to a high degree of accuracy in a reasonable amount of time. Accomplishments for the development of the diffusion coefficients of F-T products in supercritical fluids are discussed.

Date: September 1, 1996

Creator: Akgerman, A. & Bukur, D.B.

Object Type: Report

System: The UNT Digital Library

(open access)

Review of alpha-decay data from doubly-even nuclei

Alpha-decay data from doubly-even nuclei throughout the periodic table are reviewed and evaluated. From these data, nuclear radius parameters are calculated by using the Preston formula for {alpha}- decay probabilities. The radius parameters for each element behave rather regularly as a function of neutron number. The show minima at the major closed shells, increase sharply for parents just above the closed shells, and decrease smoothly toward the next shell closure. The same trend is observed for {alpha} reduced widths calculated using the Rasmussen formalism. Any irregularity or large departure from this behavior indicates probable incorrect input data. This systematic behavior can also be utilized to estimate partial half- lives.

Date: September 1, 1996

Creator: Akovali, Y. A.

Object Type: Report

System: The UNT Digital Library

(open access)

An investigation of photovoltaic powered pumps in direct solar domestic hot water systems

The performance of photovoltaic powered pumps in direct solar domestic hot water (PV-SDHW) systems has been studied. The direct PV- SDHW system employs a photovoltaic array, a separately excited DC- motor, a centrifugal pump, a thermal collector, and a storage tank. A search methodology for an optimum PV-SDHW system configuration has been proposed. A comparison is made between the long-term performance of a PV-SDHW system and a conventional SDHW system operating under three control schemes. The three schemes are: an ON-OFF flow controlled SDHW system operating at the manufacturer-recommended constant flow rate, and a linear proportional flow controlled SDHW system with the flow proportional to the solar radiation operating under an optimum proportionality. 13 refs., 6 figs.

Date: September 1, 1996

Creator: Al-Ibrahim, A. M.; Klein, S. A.; Mitchell, J. W. & Beckman, W. A.

Object Type: Article

System: The UNT Digital Library

(open access)

Accelerated life-time testing and resistance degradation of thin-film decoupling capacitors

Resistance degradation in PZT thin-film capacitors has been studied as a function of applied voltage, temperature, and film composition. It is found that the mean-time-to-failure (life-time or t{sub f}) of the capacitors shows a power law dependence on applied voltage of he form t{sub f} {proportional_to} V{sup {minus}n} (n {approximately} 4--5). The capacitor life-time also exhibits a temperature dependence of the form t{sub f} {proportional_to} exp(E{sub a}/kT), with an activation energy of {approximately} 0.8 eV. The steady-state leakage current in these samples appears to be bulk controlled. The voltage, temperature, and polarity dependence of the leakage current collectively suggest a leakage current mechanism most similar to a Frenkel-Poole process. The life-time and leakage current of the Nb-doped PZT films are superior to the undoped PZT films. This result can be explained based on the point-defect chemistry of the PZT system. Finally, the results indicate that the Nb-doped PZT films meet the essential requirements for decoupling capacitor applications.

Date: September 1, 1996

Creator: Al-Shareef, H. & Dimos, D.

Object Type: Article

System: The UNT Digital Library

(open access)

Gravitational microlensing results from MACHO

The MACHO project is searching for dark qter inthe form of massive compact haio objects (Machos), by monitoring the brightness of millions of stars in the Magellanic Clouds to search for gravitational microlensing events. Analysis of our 1st 2.3 years of data for 8.5 million stars in the LMC yields 8 candidate microlensing events, well in excess of the {approx} 1 event expected from lensing by known low-mass stars. The event timescales range from 34 to 145 days, and the estimated optical depth is N 2x10{sup -7}, about half of that expected from a `standard` halo. Likelihood analysis indicates the typical lens mass is 0.5{sup +0.3}{sub -0.2}M{sub {circle_dot}}, suggesting they may be old white dwarfs.

Date: September 1, 1996

Creator: Alcock, C. & Collaboration, MACHO

Object Type: Article

System: The UNT Digital Library