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Office of Scientific & Technical Information Technical Reports
264
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121
Texas Attorney General Opinions
50
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48
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42
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621 Matching Results
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Direct Numerical Simulation of Autoignition in a Jet in a Cross-Flow Configuration: ALCF-2 Early Science Program Technical Report
None
Date:
May 14, 2013
Creator:
Abdilghanie, A.; Frouzakis, C.E. & Fischer, P. F.
Object Type:
Report
System:
The UNT Digital Library
A Measurement of the Spatial Distribution of Diffuse TeV Gamma Ray Emission from the Galactic Plane with Milagro
Diffuse {gamma}-ray emission produced by the interaction of cosmic-ray particles with matter and radiation in the Galaxy can be used to probe the distribution of cosmic rays and their sources in different regions of the Galaxy. With its large field of view and long observation time, the Milagro Gamma Ray Observatory is an ideal instrument for surveying large regions of the Northern Hemisphere sky and for detecting diffuse {gamma}-ray emission at very high energies. Here, the spatial distribution and the flux of the diffuse {gamma}-ray emission in the TeV energy range with a median energy of 15 TeV for Galactic longitudes between 30{sup o} and 110{sup o} and between 136{sup o} and 216{sup o} and for Galactic latitudes between -10{sup o} and 10{sup o} are determined. The measured fluxes are consistent with predictions of the GALPROP model everywhere except for the Cygnus region (l {element_of} [65{sup o}, 85{sup o}]). For the Cygnus region, the flux is twice the predicted value. This excess can be explained by the presence of active cosmic ray sources accelerating hadrons which interact with the local dense interstellar medium and produce gamma rays through pion decay.
Date:
May 14, 2008
Creator:
Abdo, A. A.; Allen, B.; Aune, T.; Berley, D.; Blaufuss, E.; Casanova, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the Cosmic Ray e+ plus e- Spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
Designed as a high-sensitivity gamma-ray observatory, the Fermi Large Area Telescope is also an electron detector with a large acceptance exceeding 2 m{sup 2}sr at 300 GeV. Building on the gamma-ray analysis, we have developed an efficient electron detection strategy which provides sufficient background rejection for measurement of the steeply-falling electron spectrum up to 1 TeV. Our high precision data show that the electron spectrum falls with energy as E{sup -3.0} and does not exhibit prominent spectral features. Interpretations in terms of a conventional diffusive model as well as a potential local extra component are briefly discussed.
Date:
May 14, 2012
Creator:
Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. et al.
Object Type:
Article
System:
The UNT Digital Library
HCCI Combustion: Analysis and Experiments
Homogeneous charge compression ignition (HCCI) is a new combustion technology that may develop as an alternative to diesel engines with high efficiency and low NOx and particulate matter emissions. This paper describes the HCCI research activities being currently pursued at Lawrence Livermore National Laboratory and at the University of California Berkeley. Current activities include analysis as well as experimental work. On analysis, we have developed two powerful tools: a single zone model and a multi-zone model. The single zone model has proven very successful in predicting start of combustion and providing reasonable estimates for peak cylinder pressure, indicated efficiency and NOX emissions. This model is being applied to develop detailed engine performance maps and control strategies, and to analyze the problem of engine startability. The multi-zone model is capable of very accurate predictions of the combustion process, including HC and CO emissions. The multi-zone model h as applicability to the optimization of combustion chamber geometry and operating conditions to achieve controlled combustion at high efficiency and low emissions. On experimental work, we have done a thorough evaluation of operating conditions in a 4-cylinder Volkswagen TDI engine. The engine has been operated over a wide range of conditions by adjusting the …
Date:
May 14, 2001
Creator:
Aceves, Salvador M.; Flowers, Daniel L.; Martinez-Frias, Joel; Smith, J. Ray; Dibble, Robert; Au, Michael et al.
Object Type:
Article
System:
The UNT Digital Library
U.S.-European Union Relations and the 2007 Summit
This report evaluates the results of the annual U.S.-EU summit on April 30, 2007, in Washington, DC.
Date:
May 14, 2007
Creator:
Ahearn, Raymond; Archick, Kristin & Belkin, Paul
Object Type:
Report
System:
The UNT Digital Library
Pesticides Regulation: Current Issues
None
Date:
May 14, 1984
Creator:
Aidala, James V.
Object Type:
Report
System:
The UNT Digital Library
Preliminary analysis of the failure of well EW-05, Visalia Pole Yard, February 1, 1999
None
Date:
May 14, 1999
Creator:
Aines, R D & Newmark, R
Object Type:
Report
System:
The UNT Digital Library
Reactor and Materials Technology monthly report, April 1965
This report details activities of the Reactor and Materials Technology Department during the month of April 1965.
Date:
May 14, 1965
Creator:
Albaugh, F. W.
Object Type:
Report
System:
The UNT Digital Library
PEPC LRU: Ball Support Assembly
The PEPC LRU upper ball support assembly consists of a ball and a pneumatic air cylinder/conical seat latching mechanism to be attached to the optics support frame,and a ball attached to the PEPC LRU. Both components are designed to allow manual positioning in three axes. Upon insertion of the PEPC LRU into the structure, the upper pneumatic cylinder is actuated to latch the two assemblies together through the conical seat device to grab the lower ball to support the LRU weight. To be conservative, the design load for the assembly is 1500 pounds (the prototype PEPC LRU weight was measured to be near 1380 pounds).
Date:
May 14, 1999
Creator:
Alger, T
Object Type:
Report
System:
The UNT Digital Library
Device for Stripping Wheels from Shafts
Patent for a device for stripping wheels from shafts. Illustrations included.
Date:
May 14, 1912
Creator:
Allien, Leon F.
Object Type:
Patent
System:
The Portal to Texas History
Ion Implantation of In{sub 0.53}Ga{sub 0.47}As
None
Date:
May 14, 1999
Creator:
Almonte, Marlene I.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Draft-Equalizer
Patent for "a draft-equalizer that the draft will be equally distributed among each of the animals attached thereto, so that one may travel in the furrow, if desired, and the remainder permitted to move over the unplowed ground" (lines 22-27).
Date:
May 14, 1901
Creator:
Anderson, Samuel Cornelious
Object Type:
Patent
System:
The Portal to Texas History
Burundi’s Electoral Crisis: In Brief
This report provides context surrounding the ongoing political crisis in Burundi and analysis of U.S policy and related issues for congress
Date:
May 14, 2015
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
Crisis in the Central African Republic
This report provides background on the evolving political, security, and humanitarian crisis in the Central African Republic (CAR), which began when a fractious rebel coalition seized control of the central government in March 2013. The report also describes U.S. policy responses and analyzes possible issues for Congress, including oversight of U.S. humanitarian assistance and support for international stabilization efforts in CAR.
Date:
May 14, 2014
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
A Brief Review of Current Interest in Acupuncture in the United States
This paper is a response to requests for information about acupuncture by the Congressional Research Service. It contains a brief history of acupuncture and general information, medical claims and and its use in the United States.
Date:
May 14, 1973
Creator:
Arnold, Penelope S.
Object Type:
Report
System:
The UNT Digital Library
The Sudden Infant Death Syndrome Act of 1974
This report provides an outline of Sudden Infant Death Syndrome (SIDS) a summary of Federal programs that relate to SIDS and SIDS research, and of the Sudden Infant Death Syndrome Act of 1974.
Date:
May 14, 1974
Creator:
Arnold, Penelope S.
Object Type:
Report
System:
The UNT Digital Library
Method for Determination of Liquid Density and Viscosity of Organic Coolants Over the Temperature Range (M.P. To 850 F)
Techniques were developed to measure the liquid density and viscosity of organic coolants over the temperature range 300 to 850 deg F. (W.L.H.)
Date:
May 14, 1959
Creator:
Asanovich, G.
Object Type:
Report
System:
The UNT Digital Library
Simulation of Z boson production at D0
This thesis presents the results of some of the author's work in the High Energy Physics Group at Brown University, work done within the framework of the D0 collaboration at the Fermilab National particle accelerator. To allow a broader audience an easier understanding of the experimental data presented, a brief review of the relevant areas of Particle Physics precedes the description of the experimental setup and results. Monte Carlo simulations of Z boson production at the D0 experiment were made to allow for precise predictions of expected data at the accelerator when construction reaches completion. The specific work that was executed is presented in detail, from the point of view of experimental high energy research, followed by comments on the results obtained and on possible future directions. 4 refs., 15 figs.
Date:
May 14, 1990
Creator:
Ascher, D.
Object Type:
Report
System:
The UNT Digital Library
Branching Fractions and CP-Violating Asymmetries in Radiative B Decays to eta K gamma
The authors present measurements of the CP-violation parameters S and C for the radiative decay B{sup 0} {yields} {eta}K{sub S}{sup 0}{gamma}; for B {yields} {eta}K{gamma} they also measure the branching fractions and for B{sup +} {yields} {eta}K{sup +}{gamma} the time-integrated charge asymmetry {Alpha}{sub ch}. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 465 x 10{sup 6} B{bar B} pairs produced in e{sup +}e{sup -} annihilation. The results are S = -0.18{sub -0.46}{sup +0.49} {+-} 0.12, C = -0.32{sub -0.39}{sup +0.40} {+-} 0.07, {Beta}(B{sup 0} {yields} {eta}K{sup 0}{gamma}) = (7.1{sub -2.0}{sup +2.1} {+-} 0.4) x 10{sup -6}, {Beta}(B{sup +} {yields} {eta}K{sup +}{gamma}) = (7.7 {+-} 1.0 {+-} 0.4) x 10{sup -6}, and {Alpha}{sub ch} = (-9.0{sub -9.8}{sup +10.4} {+-} 1.4) x 10{sup -2}. The first error quoted is statistical and the second systematic.
Date:
May 14, 2008
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Observation of B+ to b_1+K0 and Search for B-meson Decays to b_10K0 and b_1pi0
We present the results of searches for decays of B mesons to final states with a b{sub 1} meson and a neutral pion or kaon. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 465 million B{bar B} pairs produced in e{sup +}e{sup -} annihilation. The results for the branching fractions are, in units of 10{sup -6}, {Beta}(B{sup +} {yields} b{sub 1}{sup +}K{sup 0}) = 9.6 {+-} 1.7 {+-} 0.9, {Beta}(B{sup 0} {yields} b{sub 1}{sup 0}K{sup 0}) = 5.1 {+-} 1.8 {+-} 0.5 (< 7.8), {Beta}(B{sup +} {yields} b{sub 1}{sup +} {pi}{sup 0}) = 1.8 {+-} 0.9 {+-} 0.2 (<3.3), and {Beta}(B{sup 0} {yields} b{sub 1}{sup 0}{pi}{sup 0}) = 0.4 {+-} 0.8 {+-} 0.2 (<1.9), with the assumption that {Beta}(b{sub 1} {yields} {omega}{pi}) = 1. They also measure the charge asymmetry {Alpha}{sub ch} (B{sup +} {yields} b{sub 1}{sup +}K{sup 0}) = -0.03 {+-} 0.15 {+-} 0.02. The first error quoted is statistical, the second systematic, and the upper limits in parentheses indicate the 90% confidence level.
Date:
May 14, 2008
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Effect of angular momentum on Valence-Quark Helicity Distributions
None
Date:
May 14, 2007
Creator:
Avakian, Harut; Brodsky, Stanley J.; Deur, Alexandre & Yuan, Feng
Object Type:
Article
System:
The UNT Digital Library
Multi-Physics Analysis of the Fermilab Booster RF Cavity
After about 40 years of operation the RF accelerating cavities in Fermilab Booster need an upgrade to improve their reliability and to increase the repetition rate in order to support a future experimental program. An increase in the repetition rate from 7 to 15 Hz entails increasing the power dissipation in the RF cavities, their ferrite loaded tuners, and HOM dampers. The increased duty factor requires careful modelling for the RF heating effects in the cavity. A multi-physic analysis investigating both the RF and thermal properties of Booster cavity under various operating conditions is presented in this paper.
Date:
May 14, 2012
Creator:
Awida, M.; Reid, J.; Yakovlev, V.; Lebedev, V.; Khabiboulline, T. & Champion, M.
Object Type:
Article
System:
The UNT Digital Library
DEVELOPMENT OF NEW MID-INFRARED ULTRAFAST LASER SOURCES FOR COMPACT COHERENT X-RAY SOURCES
In this project, we proposed to develop laser based mid-infrared lasers as a potentially robust and reliable source of ultrafast pulses in the mid-infrared region of the spectrum, and to apply this light source to generating bright, coherent, femtosecond-to-attosecond x-ray beams.
Date:
May 14, 2012
Creator:
Backus, Sterling
Object Type:
Report
System:
The UNT Digital Library
Design Considerations for an MEBT Chopper Absorber of 2.1 MeV H- at the Project X Injector Experiment at Fermilab
The Project X Injector Experiment (PIXIE) will be a prototype of the Project X front end that will be used to validate the design concept and decrease technical risks. One of the most challenging components of PIXIE is the wide-band chopping system of the Medium Energy Beam Transport (MEBT) section, which will form an arbitrary bunch pattern from the initially CW 162.5 MHz 5mA beam. The present scenario assumes diverting 80% of the beam to an absorber to provide a beam with the average current of 1mA to SRF linac. This absorber must withstand a high level of energy deposition and high ion fluence, while being positioned in proximity of the superconductive cavities. This paper discusses design considerations for the absorber. Thermal and mechanical analyses of a conceptual design are presented, and future plans for the fabrication and testing of a prototype are described.
Date:
May 14, 2012
Creator:
Baffes, C.; Awida, M.; Chen, A.; Eidelman, Y.; Lebedev, V.; Prost, L. et al.
Object Type:
Article
System:
The UNT Digital Library