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4,398 Matching Results

Start Over Year 1991 Month July Language English

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Results: 1 - 24 of 4,398 next

(open access)

AIDS Update, Volume 6, Number 7, July 1991

Monthly newsletter describing news and events related to the AIDS Resource Center in Dallas, Texas as well as articles, letters, advice columns, and advertisements of interest to subscribers.

Date: July 1991

Creator: AIDS Resource Center (Dallas, Tex.)

Object Type: Journal/Magazine/Newsletter

System: The UNT Digital Library

(open access)

INEL BNCT Program: Bulletin, Volume 5, No. 7

This Bulletin presents a summary of accomplishments and highlights in the Idaho National Engineering Laboratory's (INEL) Boron Neutron Capture Therapy (BNCT) Program for June, 1991. This bulletin includes information on the brain tumor and melanoma research programs, Power Burst Facility (PBF) technical support and modifications, PBF operations, and animal data charts. Specific highlights include: final-dosage-form BSH samples were analyzed for purity, with the sample from Centronic Ltd the most free from contamination and oxidation products; MRI spectroscopy will be upgraded to provide a potential for boron resolution of 0.75 cm/pixel; neutron and gamma measurements were made for the HFR epithermal neutron beam; the current status of six spontaneous brain-tumor dogs; production of MoAbs against the pituitary CRF receptor; growth of BL6 in low Phe/Tyr medium; an altered synthetic pathway for carboranyl alanine; and encapsulation of {ital i}-B{sub 20}H{sub 18}{sup 2-} into liposomes for baseline murine studies. 2 figs., 4 tabs. (MHB)

Date: July 1, 1991

Creator: Ackermann, A. L.

Object Type: Report

System: The UNT Digital Library

(open access)

Results of investigations at the Zunil geothermal field, Guatemala: Well logging and brine geochemistry

The well logging team from Los Alamos and its counterpart from Central America were tasked to investigate the condition of four producing geothermal wells in the Zunil Geothermal Field. The information obtained would be used to help evaluate the Zunil geothermal reservoir in terms of possible additional drilling and future power plant design. The field activities focused on downhole measurements in four production wells (ZCQ-3, ZCQ-4, ZCQ-5, and ZCQ-6). The teams took measurements of the wells in both static (shut-in) and flowing conditions, using the high-temperature well logging tools developed at Los Alamos National Laboratory. Two well logging missions were conducted in the Zunil field. In October 1988 measurements were made in well ZCQ-3, ZCQ-5, and ZCQ-6. In December 1989 the second field operation logged ZCQ-4 and repeated logs in ZCQ-3. Both field operations included not only well logging but the collecting of numerous fluid samples from both thermal and nonthermal waters. 18 refs., 22 figs., 7 tabs.

Date: July 1, 1991

Creator: Adams, A.; Dennis, B.; Van Eeckhout, E.; Goff, F.; Lawton, R.; Trujillo, P.E. et al.

Object Type: Report

System: The UNT Digital Library

(open access)

Design and performance of liquid hydrogen target systems for the Fermilab Fixed Target Program

The Fermilab 1990--1991 Fixed Target Program featured six experiments utilizing liquid hydrogen or liquid deuterium targets as part of their apparatus. Each design was optimized to the criteria of the experiment, resulting in variations of material selection, methods of refrigeration and secondary containment. Collectively, the targets were run for a total of 14,184 hours with an average operational efficiency of 97.6%. The safe and reliable operation of these targets was complemented by an increased degree of documentation and component testing. This operation was also aided by several key upgrades. All the systems were designed and fabricated under a set of written guidelines that blend analytical calculations and empirical guidance drawn from over twenty years of target fabrication experience. 3 refs., 4 tabs.

Date: July 1, 1991

Creator: Allspah, D.; Danes, J.; Peifer, J. & Stanek, R.

Object Type: Article

System: The UNT Digital Library

(open access)

ASCOT 91 field experiment : PNL airsonde data summary.

Pacific Northwest Laboratory (PNL) participated in the Winter 1991 Atmospheric Studies in Complex Terrain (ASCOT) field experiment conducted in the vicinity of the Rocky Flats Plant between Boulder and Denver, Colorado. This report contains a summary of operations and data associated with free-release-ball oon-borne atmospheric soundings made by PNL between January 29 and February 8, 1991. Given here are descriptions of the site and instrumentation, a brief summary of the soundings, and a description of the data post processing. The appendices contain a detailed summary of all soundings and ASCOT plots of completed soundings.

Date: July 1, 1991

Creator: Allwine, JM Hubbe and KJ

Object Type: Report

System: The UNT Digital Library

(open access)

The Newsletter of the Texas Chapter of the American Fisheries Society, Number 58, July 1991

Newsletter of the Texas Chapter of the American Fisheries Society containing information about the organization, membership, and field of aquaculture and ecosystem management.

Date: July 5, 1991

Creator: American Fisheries Society. Texas Chapter.

Object Type: Journal/Magazine/Newsletter

System: The Portal to Texas History

(open access)

[Estimating the 1978-1990 and Furture Spread of HIV Type 1 in Subgroups of Homosexual Men]

An abstract of a study done by the American Journal of Epidemiology about the spread of HIV among homosexual and bisexual men in subgroup between the years of 1978 - 1990.

Date: July 8, 1991

Creator: American Journal of Epidiemology

Object Type: Text

System: The UNT Digital Library

(open access)

Proof of concept test and evaluation, Lasentec refining sensor

The Scanning Laser Microscopes (SLM) LAB-TEC 150 and PAR-TEC 200, were evaluated as instruments for monitoring fiber development during refining. The LAB-TEC 150 did not produce repeatable results which could be related to fiber development, as measured by Canadian Standard Freeness or hand sheet physical strength properties. The PAR-TEC 200 was found to correlate to strength development (Burst and Tensile Indices) during the first stages of laboratory Valley beating of bleached hardwood and softwood pulps. Preliminary testing of the PAR-TEC 200 in a pilot scale refining circuit was inconclusive. The influence of several process variables on instrument readings was investigated including flow rate, probe position and consistency. It is likely that a dual sensor system would be required in a commercial mill environment, to eliminate the effect of process variables. The next phase of the evaluation and development program will include two investigations: (1) A more scientific evaluation of which changes in fiber morphology the sensor is detecting during refining, and (2) a continuation of the in-line development; with a goal of eliminating process flow variables, and more accurately monitoring fiber development, by the use of two sensors, one before and after refining.

Date: July 1, 1991

Creator: Anderson, J.E.

Object Type: Report

System: The UNT Digital Library

(open access)

The Department of Energy's Solar Industrial Program: New ideas for American industry

As society becomes more and more sensitive to the environment, and energy supplies become more scarce, the application of solar energy is expanding into new areas. The industrial sector is one of the most difficult for solar energy to impact because of its technical diversity and economic requirements. However, the opportunities are still abundant. The Department of Energy's Solar Industrial Program is dedicated to advancing the applications of solar energy in this sector. Research and technology development activities are currently focused in three areas: solar process heat, advanced materials manufacturing, and destruction of chemical wastes. The Solar Energy Research Institute manages these activities for DOE with close interactions with other federal agencies, private industry, and universities. 7 figs.

Date: July 1, 1991

Creator: Anderson, John V.; Hauser, Steven G. & Clyne, Richard J.

Object Type: Article

System: The UNT Digital Library

(open access)

Development of analytical procedures for coprocessing. Quarterly technical progress report, October 1--December 31, 1990

The overall objective of this contract is to improve our understanding of the fundamental chemistry of coprocessing. This includes an evaluation of methods to distinguish between compound classes originating from coal versus those originating from petroleum resid. An objective of this project is to provide detailed knowledge of the composition of coprocessing products. This report reviews the study of variations in compound classes in response to changes in the coal/resid ratio in the feed as a means of determining the source of compound classes. Where there were significant trends in composition with changing, coal concentration, selectivity factors indicating the contribution of coal and resid to particular compound classes were determined. As an example, in middle and heavy distillates, both acids and bases increased with increasing coal concentration. Selectivity factors indicated that in the middle distillate, 91 percent of the acids and 12 percent of the bases would be derived from coal (with a 1:1 ratio of coal:resid in the feed). In the heavy distillate, coal continued to be the dominant source of acids and bases although to a lesser extent. Phenols tended to increase with increasing coal content while nitrogen acids (indoles, carbazoles) decreased. Nitrogen acids were more prominent in …

Date: July 1, 1991

Creator: Anderson, R. P.

Object Type: Report

System: The UNT Digital Library

(open access)

Development of analytical procedures for coprocessing. Final technical report

One phase of improving understanding of the fundamental chemistry of coprocessing involves development of the ability to distinguish between products originating from coal versus those originating from petroleum resid. A primary objective of this project was to develop analytical techniques to determine the source (coal versus resid) of the various compound types found in coprocessing products. A corollary objective was to develop an expanded knowledge of the detailed composition of coprocessing products. Two approaches were evaluated for distinguishing between products originating from coal and those originating from petroleum resid. One was based on the use of carbon isotope ratios and the other was based on variations in compound classes in response to changes in the ratio of coal to resid in the coprocessing feed. Other researchers using carbon isotope ratios to determine the origin of products have typically examined distillation fractions. This project involved determination of the origin of chemical classes (e.g., saturates, neutral aromatics, phenols, indoles, etc.) rather than distillate classes. Maya resid and Illinois No. 6 coal (with coal feed varying from 2 to 40 percent) were coprocessed in a batch autoclave to obtain products for detailed analysis.

Date: July 1, 1991

Creator: Anderson, R. P.; Green, J. B. & Vogh, J. W.

Object Type: Report

System: The UNT Digital Library

(open access)

0-G experiments with advanced ceramic fabric wick structures

Both Air Force and NASA future spacecraft thermal management needs span the temperature range from cryogenic to liquid metals. Many of these needs are changing and not well defined and will remain so until goals, technology, and missions converge. Nevertheless, it is certain that high-temperature (> 800 K) and medium-temperature (about 450 K) radiator systems will have to be developed that offer significant improvements over current designs. This paper discusses experiments performed in the lower temperature regime as part of a comprehensive advanced ceramic fabric (ACF) heat pipe development program. These experiments encompassed wicking tests with various ceramic fabric samples, and heat transfer tests with a 1-m long prototype ACF water heat pipe. A prototype ceramic fabric/titanium water heat pipe has been constructed and tested; it transported up to 60 W of power at about 390 K. Startup and operation both with and against gravity examined. Wick testing was begun to aid in the design and construction of an improved prototype heat pipe, with a 38-{mu}m stainless steel linear covered by a biaxially-braided Nextel (trademark of the 3M Co., St. Paul, Minnesota) sleeve that is approximately 300-{mu}m thick. Wick testing took place in 1-g; limited testing in 0-g was initiated, …

Date: July 1991

Creator: Antoniak, Z. I.; Webb, B. J.; Bates, J. M.; Cooper, M. F. & Pauley, K. A.

Object Type: Article

System: The UNT Digital Library

(open access)

Strong CP violation and the neutron electric dipole moment revisited

The relation between the CP violating operator {theta}F{tilde F} and its effective version L{sub CP}{sup eff} is reconsidered on the basis of the anomalous Ward-Takahashi (WT) identity. The consistency of the previous phenomenological calculations of the neutron electric dipole moment (NEDM) with the WT identity is critically examined. A consistent evaluation of an O(N{sub c}{sup o}) contribution to NEDM is given and the result is compared with the leading term in the chiral expansion which is O(N{sub c}{sup {minus}1}).

Date: July 1, 1991

Creator: Aoki, Sinya & Hatsuda, Tetsuo

Object Type: Report

System: The UNT Digital Library

(open access)

Strong CP violation and the neutron electric dipole moment revisited

Date: July 1, 1991

Creator: Aoki, Sinya (State Univ. of New York, Stony Brook, NY (United States). Inst. for Theoretical Physics) & Hatsuda, Tetsuo (Washington Univ., Seattle, WA (United States). Inst. for Nuclear Theory)

Object Type: Report

System: The UNT Digital Library

(open access)

Oil in the Family, George W. Bush and His Slippery Friends

None

Date: July 26, 1991

Creator: Armstrong, David G.

Object Type: Text

System: The UNT Digital Library

(open access)

Calibration and operation of the PNL Barrel Assayer

Pacific Northwest Laboratory operates a Barrel Assayer to measure the radionuclide content of 208-liter waste drums. This mobile apparatus is designed to provide quantitative information on each radioisotope in a drum and to recognize and locate hot spots within the drum. A lead-collimated intrinsic-germanium detector mounted on a moveable platform vertically scans a rotating drum for gamma-ray activity while 62 stationary {sup 10}BF{sub 3} tubes measure neutrons emitted by transuranic isotopes within the waste. Several approaches have been used to document the controls under which the Barrel Assayer has been operated from February 1989 through December 1990. Resin-filled 208-1 calibration barrels containing known quantities of {sup 60}Co, {sup 137}Cs, and {sup 134}Cs were measured by the Barrel Assayer and found to be well within 25% of the known values. A thorium nitrate standard that served as the secondary, or field, standard verified that the detector has been within calibration during the period from February 1989 through December 1990. In previous testing, 23 waste drums were assayed at several commercial nuclear power plants. Subsequently, aliquots from the top, middle, and bottom of the barrels were analyzed. The ratio of grab-sample concentration to direct-assay concentration averaged {minus}1.6 for one plant and +1.3 …

Date: July 1, 1991

Creator: Arthur, R J

Object Type: Report

System: The UNT Digital Library

(open access)

Radiation temperature of non-equilibrium plasmas

In fusion devices measurements of the radiation temperature T{sub r} ({omega}, k) near the electron cyclotron frequency {omega}{sub C} and the second harmonic 2{omega}{sub C} in directions nearly perpendicular to the confining magnetic field B (i.e., k {approx} k {perpendicular}) serve to map out the electron temperature profiles T{sub e}(r,t). For optically thick plasma at thermodynamic equilibrium T{sub r} = T{sub e}. However, there is increasing experimental evidence for the presence of non-equilibrium electron distributions (such as a drifting Maxwellian with appreciable values of the streaming parameter {omicron} = v{sub d}/v{sub t}, a bi- Maxwellian, and anisotropic Maxwellian with T {perpendicular} {ne} T {parallel}, etc.,) in tokamak plasmas, especially in the presence of radio-frequency heating. Here, we examine (both non-relativistically and relativistically) the dependence of T{sub r} on {omicron}, T{perpendicular}/T{parallel}, T{sub h}/T{sub b}, n{sub h}/n{sub b}etc., where n{sub b}, n{sub h}, T{sub b}, T{sub h} are the densities and temperatures, respectively, of the bulk and the hot components of the bi-Maxwellian plasma. Our bi-Maxwellian results predict that the ratio T{sub r}/T{sub e} is a very sensitive function of the ratios n{sub h}/n{sub b} and T{sub h}/T{sub b}. Further, these relativistic and non-relativistic results satisfy the well-known limit c {yields} {infinity} …

Date: July 1, 1991

Creator: Arunasalam, V.

Object Type: Report

System: The UNT Digital Library

(open access)

SWSA 6 interim corrective measures environmental monitoring: FY 1990 results

This report presents the results and conclusions from a multifaceted monitoring effort associated with the high-density polyethylene caps installed in Solid Waste Storage Area (SWSA) 6 at Oak Ridge National Laboratory (ORNL) as an interim corrective measure (ICM). The caps were installed between November 1988 and June 1989 to meet Resource Conservation and Recovery Act (RCRA) requirements for closure of those areas of SWSA 6 that had received RCRA-regulated wastes after November 1980. Three separate activities were undertaken to evaluate the performance of the caps: (1) wells were installed in trenches to be covered by the caps, and water levels in these intratrench wells were monitored periodically; (2) samples were taken of the leachate in the intratrench wells and were analyzed for a broad range of radiological and chemical contaminants; and (3) water levels in wells outside the trenches were monitored periodically. With the exception of the trench leachate sampling, each of these activities spanned the preconstruction, construction, and postconstruction periods. Findings of this study have important implications for the ongoing remedial investigation in SWSA 6 and for the design of other ICMs. 51 figs., 2 tabs.

Date: July 1, 1991

Creator: Ashwood, T. L. & Spalding, B. P.

Object Type: Report

System: The UNT Digital Library

(open access)

SWSA 6 interim corrective measures environmental monitoring: FY 1990 results. Environmental Restoration Program

Date: July 1, 1991

Creator: Ashwood, T. L. & Spalding, B. P.

Object Type: Report

System: The UNT Digital Library

(open access)

The effect of inoperative thermocouples on K reactor limits

Previous operating procedures for the K reactor required management approval for continued operation if more than six monitor pin thermocouples were inoperable. Currently, there are eight inoperable thermocouples and this number is expected to increase after reactor restart. This report provides the basis and the power impact for allowing up to 20 inoperable thermocouples in the core. The SRS reactor operating limits are specified as limits on the assembly average effluent temperature, which is determined by averaging the four quadrant temperatures at the bottom of an assembly. Azimuthal asymmetries in fuel and target material distribution and in the flow channel areas contribute to an azimuthal temperature variation. Therefore, for an asymmetric assembly, each monitor pin thermocouple measures a different temperature. If a thermocouple fails in an assembly, the control computer substitutes the highest remaining temperature for the failed thermocouple and computes the average. In some cases failed thermocouples are permanently jumpered to the remaining thermocouple having the highest temperature. If the hottest thermocouple fails in an assembly, the calculated average temperature determined from thermocouple substitution is lower than the actual assembly average temperature. For this reason, allowance must be made for the error in the average temperature measurement due to …

Date: July 1, 1991

Creator: Askew, N. M. & Hardy, B. J.

Object Type: Report

System: The UNT Digital Library

(open access)

The effect of inoperative thermocouples on K reactor limits

Date: July 1, 1991

Creator: Askew, N. M. & Hardy, B. J.

Object Type: Report

System: The UNT Digital Library

(open access)

Transient behavior of simultaneous flow of gas and surfactant solution in consolidated porous media

The main objective of this experimental research was to investigate the mechanisms of foam generation and propagation in porous media. Results obtained give an insight into the conditions of foam generation and propagation in porous media. The rate of propagation of foam is determined by the rates of lamellae generation, destruction, and trapping. Several of the factors that contribute to foam generation have studied with Chevron Chaser SD1000 surfactant. Interfacial tension (IFT) measurements were performed using a spinning drop apparatus. The IFT of two surfactant samples of different concentrations were measured with dodecane and crude oil from the Huntington Beach Field as a function of temperature and time. Foam was used as an oil-displacing fluid. However, when displacing oil, foam was not any more effective than simultaneous brine and gas injection. A series of experiments was performed to study the conditions of foam generation in Berea sandstone cores. Results show that foam may be generated in sandstone at low flow velocities after extended incubation periods. The effect of pregenerating foam before injection into the sandstone was also studied. The pressure profiles in the core were monitored using three pressure taps along the length of the core. A systematic study of …

Date: July 1, 1991

Creator: Baghdikian, S. Y. & Handy, L. L.

Object Type: Report

System: The UNT Digital Library