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1,477 Matching Results
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Near-net-shape fabrication by forced-flow, thermal-gradient CVI
Forced-flow, thermal gradient chemical vapor infiltration (FCVI) has been developed for the rapid densification of ceramic matrix composites. For preforms of >3 mm thickness FCVI can produce a near-net-shape part in less than one day as opposed to isothermal, isobaric CVI which requires several weeks to densify such a component. Efforts at ORNL and elsewhere have resulted in capability to produce prototypical thick-walled heat exchanger tubes and turbine disk blanks. This paper will review recent modeling and experimental efforts related to the FCVI of cylindrical forms.
Date:
May 1, 1998
Creator:
Besmann, T. M.; Stinton, D. P.; Lowden, R. A.; Probst, K. J. & Anderson, T. J.
Object Type:
Article
System:
The UNT Digital Library
Mandates Information Act: Implications for Congressional Action on Legislation Containing Private Sector Mandates
None
Date:
May 15, 1998
Creator:
Beth, Richard S.
Object Type:
Report
System:
The UNT Digital Library
Top to charged higgs decays and top properties at the Tevatron
The Tevatron experiments have measured top quark properties in addition to the top quark mass and pair production cross section. These measurements are based on 110 pb{sup -1} of p{anti p} collisions at {radical}s=1.8 TeV recorded by CDF and 125 pb{sup -1} of data recorded by D0 during the years 1992-95. We describe two separate techniques which exploit the top data samples to exclude large branching fractions of the top quark to a charged Higgs boson. we also determine the fraction of longitudinal W bosons produced in top quark decays to be 0.55{+-}0.34, compared to the standard model prediction of 0.71. Other top branching fraction measurements, kinematic studies, and searches for rare decays are summarized.
Date:
May 1, 1998
Creator:
Bevensee, Brendan
Object Type:
Article
System:
The UNT Digital Library
Large underground radioactive waste storage tanks successfully cleaned at Oak Ridge National Laboratory
Waste retrieval operations were successfully completed in two large underground radioactive waste storage tanks in 1997. The US Department of Energy (DOE) and the Gunite Tanks Team worked cooperatively during two 10-week waste removal campaigns and removed approximately 58,300 gallons of waste from the tanks. About 100 gallons of a sludge and liquid heel remain in each of the 42,500 gallon tanks. These tanks are 25 ft. in diameter and 11 ft. deep, and are located in the North Tank Farm in the center of Oak Ridge National Laboratory. Less than 2% of the radioactive contaminants remain in the tanks, proving the effectiveness of the Radioactive Tank Cleaning System, and accomplishing the first field-scale cleaning of contaminated underground storage tanks with a robotic system in the DOE complex.
Date:
May 1, 1998
Creator:
Billingsley, K.; Burks, B.L.; Johnson, M.; Mims, C.; Powell, J. & Hoesen, D. van
Object Type:
Article
System:
The UNT Digital Library
Trial Burn Activities for a Mixed Waste Incinerator
The Consolidated Incineration Facility (CIF) is located on the Savannah River Site (SRS), owned by the U. S. Department of Energy and managed by BNFL, Inc. for the Westinghouse Savannah River Company. SRS received permits from the South Carolina Department of Health and Environmental Control (SCDHEC) and the U. S. Environmental Protection Agency (EPA), Region IV to construct and operate the CIF, a hazardous, radioactive mixed waste incinerator. This paper presents the results of the trial burn conducted on the CIF in April 1997 which is the initial demonstration of compliance with the permits. The incinerator is currently operating under approved post-trial burn conditions while the trial burn results are being evaluated. A final operating permit is expected the fall of 1998.
Date:
May 1, 1998
Creator:
Birk, Marcia B.
Object Type:
Report
System:
The UNT Digital Library
The Harper Herald (Harper, Tex.), Vol. 69, No. 69, Ed. 1 Tuesday, May 12, 1998
Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.
Date:
May 12, 1998
Creator:
Bishop, Karen
Object Type:
Newspaper
System:
The Portal to Texas History
The Harper Herald (Harper, Tex.), Vol. 69, No. 70, Ed. 1 Tuesday, May 19, 1998
Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.
Date:
May 19, 1998
Creator:
Bishop, Karen
Object Type:
Newspaper
System:
The Portal to Texas History
The Harper Herald (Harper, Tex.), Vol. 69, No. 71, Ed. 1 Tuesday, May 26, 1998
Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 1998
Creator:
Bishop, Karen
Object Type:
Newspaper
System:
The Portal to Texas History
Spatial resolution attainable in germanium detectors by pulse shape analysis
There are several applications for which it is desirable to calculate the locations and energies of individual gamma-ray interactions within a high purity germanium (HPGe) detector. These include gamma-ray imaging and Compton suppression. With a segmented detector this can be accomplished by analyzing the pulse shapes of the signals from the various segments. We examine the fundamental limits to the spatial resolution attainable with this approach. The primary source of error is the series noise of the field effect transistors (FETs) at the inputs of the charge amplifiers. We show how to calculate the noise spectral density at the output of the charge amplifiers due to an optimally selected FET. This calculation is based only on the detector capacitance and a noise constant for the FET technology. We show how to use this spectral density to calculate the uncertainties in parameters, such as interaction locations and energies, that are derived from pulse shape analysis using maximum likelihood estimation (MLE) applied to filtered and digitized recordings of the charge signals. Example calculations are given to illustrate our approach. Experimental results are given that demonstrate that one can construct complete systems, from detector through data analysis, that come near the theoretical limits.
Date:
May 1, 1998
Creator:
Blair, J., Bechtel, NV; Beckedahl, D.; Kammeraad, J. & Schmid, G., LLNL
Object Type:
Article
System:
The UNT Digital Library
Dosage des Elements en Trace des Calcaires Au Service de l'Archeologie
Numerous quarries in the Lutetian limestone formations of the Paris Basin provided stone for the building and the decoration of monuments from antiquity to the present. To determine the origin of stone used for masonry and sculptures in these monuments, a team of geologists and archaeologists has investigated 300 quarries and collected 2,300 samples. Petrographic and paleontologic examination of thin sections allows geologists to distinguish Lutetian limestones from Jurassic and Cretaceous limestones. Geologists also seek to formulate hypotheses regarding the origin of Lutetian limestones used for building and sculpture in the Paris region. In the search for the sources of building and sculptural stone, the analytical methods of geologists are limited because often several quarries produce the same lithofacies. A new tool is now available, however, to attack questions of provenance raised by art historians. Because limestones from different sources have distinctive patterns of trace-element concentrations, compositional analysis by neutron activation allows them to compare building or sculptural stone from one monument with stone from quarries or other monuments. This analytical method subjects a powdered limestone sample to standard neutron activation analysis procedures at Brookhaven National Laboratory. With the help of computer programs, the compositional fingerprints of Lutetian limestones can …
Date:
May 1, 1998
Creator:
Blanc, A; Holmes, L. & Harbottle, G.
Object Type:
Article
System:
The UNT Digital Library
Shielding Analysis of the 5320 Shipping Cask
The purpose of this work is to demonstrate that the 5320 shipping cask meets Federal regulations for maximum radiation dose rates when loaded with the intended plutonium oxide cargo. It should be emphasized that the 5320 is an existing cask, and therefore this work represents confirmatory analysis rather than design analysis.
Date:
May 1, 1998
Creator:
Blanchard, A. & Nathan, S.
Object Type:
Report
System:
The UNT Digital Library
Measurement of the top quark mass
The first evidence and subsequent discovery of the top quark was reported nearly 4 years ago. Since then, CDF and D0 have analyzed their full Run 1 data samples, and analysis techniques have been refined to make optimal use of the information. In this paper, we report on the most recent measurements of the top quark mass, performed by the CDF and D0 collaborations at the Fermilab Tevatron. The CDF collaboration has performed measurements of the top quark mass in three decay channels from which the top quark mass is measured to be 175.5 {+-} 6.9 GeV=c{sup 2}. The D0 collaboration combines measurements from two decay channels to obtain a top quark mass of 172.1 {+-} 7.1 GeV/c{sup 2}. Combining the measurements from the two experiments, assuming a 2 GeV GeV/c{sup 2} correlated systematic uncertainty, the measurement of the top quark mass at the Tevatron is 173.9 {+-} 5.2 GeV/c{sup 2}. This report presents the measurements of the top quark mass from each of the decay channels which contribute to this measurement.
Date:
May 1, 1998
Creator:
Blusk, Steven R.
Object Type:
Article
System:
The UNT Digital Library
Thermodynamic and Structural Studies of Layered Double Hydroxides
The preparation of layered double hydroxides via titration with sodium hydroxide was thoroughly investigated for a number of M(II)/M(III) combinations. These titration curves were examined and used to calculate nominal solubility product constants and other thermodynamic quantities for the various LDH chloride systems.
Date:
May 1998
Creator:
Boclair, Joseph W. (Joseph Walter)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Measurement of the W Boson Production Asymmetry and W Boson Width at CDF
We describe two measurements using 110 {+-} 7 pb{sup -1} of data collected by the CDF detector during 1992-95. The first is a new measurement of the charge asymmetry in the lepton rapidity range 0 < {vert_bar}y{sub l}{vert_bar} < 2.5 using W {yields} {mu}{nu}, e{nu} events. The asymmetry data constrain the ratio of d and u quark momentum distributions in the proton over the x range of 0.006 to 0.34 at Q{sup 2} {approx} M{sub W}{sup 2}. Although the data in the central rapidity region ({vert_bar}y{sub l}{vert_bar} < 1.1) are reproduced by modern parametrizations of parton distributions, there are differences in the high rapidity regions. The second measurement is a direct measurement of the W width using the lineshape of the transverse mass spectrum. The extracted W width is in good agreement with the standard model value, and with values obtained from the indirect method using the measured ratio of W and Z events.
Date:
May 1, 1998
Creator:
Bodek, A.
Object Type:
Article
System:
The UNT Digital Library
Progress in metal ion separation and preconcentration : an overview.
A brief historical perspective covering the most mature chemically-based metal ion separation methods is presented, as is a summary of the recommendations made in the 1987 National Research Council (NRC) report entitled ''Separation and Purification: Critical Needs and Opportunities''. A review of Progress in Metal Ion Separation and Preconcentration shows that advances are occurring in each area of need cited by the NRC. Following an explanation of the objectives and general organization of this book, the contents of each chapter are briefly summarized and some future research opportunities in metal ion separations are presented.
Date:
May 19, 1998
Creator:
Bond, A. H.
Object Type:
Article
System:
The UNT Digital Library
Results on Dijets with a Central Rapidity Gap from CDF
Results on dijets with a central rapidity gap at {radical}s = 1800 GeV are briefly summarized. Preliminary new results from data at {radical}s = 630 GeV are presented and compared to those at {radical}s = 1800 GeV.
Date:
May 1, 1998
Creator:
Borras, K.
Object Type:
Article
System:
The UNT Digital Library
Results on hard diffraction from CDF
Results on diffractive W-boson and dijet production, selected with a rapidity gap in the forward detector region, are briefly summarized. The new sample of Run 1C data with a Roman Pot trigger has been analyzed for dijet production in single diffraction and double pomeron exchange. Comparisons of diffractive to non-diffractive dijet events are presented.
Date:
May 1, 1998
Creator:
Borras, K.
Object Type:
Article
System:
The UNT Digital Library
Housing Issues in the 105th Congress
None
Date:
May 21, 1998
Creator:
Bourdon, E. Richard
Object Type:
Report
System:
The UNT Digital Library
Housing Issues in the 105th Congress
This report provides an overview of the housing issues in the 105th congress.
Date:
May 21, 1998
Creator:
Bourdon, Richard
Object Type:
Report
System:
The UNT Digital Library
Scouting, Volume 86, Number 3, May-June 1998
Bi-monthly publication of the Boy Scouts of America, written for Boy Scout leaders, officials, and others interested in the work of the Scouts. It includes articles about events and activities, updates from the national headquarters, topical columns and essays, and news from various chapters nationwide.
Date:
May 1998
Creator:
Boy Scouts of America
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Mentoring in Family Firms : A Reflective Analysis of Senior Executives' Perceptions
This study is a reflective analysis of the perceptions of senior executives in family businesses that relate to their personal experiences of having been mentored. The study presents an overview of the topic of mentoring, defines key terms, and identifies questions addressed in the research. The rationale for this study rested on two facts. First, mentoring in non-family businesses constitutes the majority of the literature. That literature supports the importance of mentoring. Secondly, mentoring in family businesses has not been researched.
Date:
May 1998
Creator:
Boyd, John Hillyer
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
In situ reflectance and virtual interface analysis for compound semiconductor process control
The authors review the use of in-situ normal incidence reflectance, combined with a virtual interface model, to monitor and control the growth of complex compound semiconductor devices. The technique is being used routinely on both commercial and research metal-organic chemical vapor deposition (MOCVD) reactors and in molecular beam epitaxy (MBE) to measure growth rates and high temperature optical constants of compound semiconductor alloys. The virtual interface approach allows one to extract the calibration information in an automated way without having to estimate the thickness or optical constants of the alloy, and without having to model underlying thin film layers. The method has been used in a variety of data analysis applications collectively referred to as ADVISOR (Analysis of Deposition using Virtual Interfaces and Spectroscopic Optical Reflectance). This very simple and robust monitor and ADVISOR method provides one with the equivalent of a real-time reflection high energy electron reflectance (RHEED) tool for both MBE and MOCVD applications.
Date:
May 1, 1998
Creator:
Breiland, W.G.; Hou, H.Q.; Hammons, B.E. & Klem, J.F.
Object Type:
Article
System:
The UNT Digital Library
Reactive characterization as a probe of the nature of catalytic sites. Final report, April 15, 1988--February 14, 1993
The primary goal of the last year of the research program was to create a new type of selective heterogeneous catalyst. The new catalysts were synthesized, their unusual selectivity assessed by a model reaction, and some of the parameters which are important in creating unusual selectivity in these catalysts determined. Near the end of this proposal, considerable excitement was generated by the discovery of high temperature superconductors. It was decided to briefly investigate the activity of some superconductors and related cuprates. This research was done in concert with a project funded by Ford Motor Company. Catalysts were investigated for two reactions useful in pollution control: CO oxidation and NO reduction. In addition, some stoichiometric measurements of the oxygen content of superconductors and related cuprates were made using a TPR apparatus in the lab. In addition, some experiments were done with the objective of preparing novel MO-Pd/Al{sub 2}O{sub 3} catalysts in which the Mo and Pd were in close contact. These catalysts have the potential of replacing much more expensive rhodium containing catalysts which are currently used for emissions control. Progress on the following is described: H{sub 2}-D{sub 2} exchange on transition metals; New method of determining the number of active …
Date:
May 1, 1998
Creator:
Brenner, A.
Object Type:
Report
System:
The UNT Digital Library
Decommissioning plan for the National Ignition Facility
The National Ignition Facility (NIF) is a US Department of Energy inertial confinement laser fusion experimental facility currently under construction at the Lawrence Livermore National Laboratory (LLNL). To ensure that decontamination and decommissioning (D&D) issues at the end-of-life are manageable, this subject has received attention from an early stage. This paper summarizes the NIF D&D issues, and the status of the D&D plan.
Date:
May 27, 1998
Creator:
Brereton, S.
Object Type:
Article
System:
The UNT Digital Library