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Office of Scientific & Technical Information Technical Reports
395
Congressional Research Service Reports
123
Texas Attorney General Opinions
61
Texas Patents
58
Texas Laws and Resolutions Archive
48
Government Accountability Office Reports
47
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32
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17
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Semi-analytical description of the modular section of the coherent electron cooling via integral transforms
N/A
Date:
May 12, 2013
Creator:
A., Elizarov & Litvinenko, V.
Object Type:
Article
System:
The UNT Digital Library
Device and technique for in-situ coating of the RHIC cold bore vacuum tubes with thick OFHC
N/A
Date:
May 12, 2013
Creator:
A., Hershcovitch; Blaskiewicz, M.; Brennan, J. M.; Chawla, A.; Custer, A.; Erickson, M. et al.
Object Type:
Article
System:
The UNT Digital Library
ENGINEERING OF THE AGS SNAKE COIL ASSEMBLY.
A 30% Snake superconducting magnet is proposed to maintain polarization in the AGS proton beam, the magnetic design of which is described elsewhere. The required helical coils for this magnet push the limits of the technology developed for the RHIC Snake coils. First, fields must be provided with differing pitch along the length of the magnet. To accomplish this, a new 3-D CAD system (''Pro/Engineer'' from PTC), which uses parametric techniques to enable fast iterations, has been employed. Revised magnetic field calculations are then based on the output of the mechanical model. Changes are made in turn to the model on the basis of those field calculations. To ensure that accuracy is maintained, the final solid model is imported directly into the CNC machine programming software, rather than by the use of graphics translating software. Next, due to the large coil size and magnetic field, there was concern whether the structure could contain the coil forces. A finite element analysis was performed, using the 3-D model, to ensure that the stresses and deflections were acceptable. Finally, a method was developed using ultrasonic energy to improve conductor placement during coil winding, in an effort to minimize electrical shorts due to conductor …
Date:
May 12, 2003
Creator:
ANERELLA,M. GUPTA,R. KOVACH,P. MARONE,A. PLATE,S. POWER,K. SCHMALZLE,J. WILLEN,E.
Object Type:
Article
System:
The UNT Digital Library
LMHC/TWRS year 2000 equipment project renovation and contingency plan
A program has been completed to assess, renovate and document tank farm field equipment year 2000 compliance. A communication plan has also been prepared (see section 8.0). The objective of the program was to assure that no adverse effects occur in tank farm operations as a result of equipment malfunction due to the advent of year 2000. The purposes of this document are to: describe the process used to assess field equipment; document items found to be compliant; document items found to be non-compliant including options for making the equipment year 2000 functional and/or tolerant; describe location and management of field equipment year 2000 documentation; assess overall vulnerability of TWRS field equipment with regard to year 2000 problems and describe plans to communicate year 2000 equipment review results and corrective actions.
Date:
May 12, 1999
Creator:
Adams, M. R.
Object Type:
Report
System:
The UNT Digital Library
TWRS process engineering data management plan
The Tank Characterization Data Management (TCDM) system provides customers and users with data and information of known and acceptable quality when they are needed, in the form they are needed, and at a reasonable cost. The TCDM mission will be accomplished by the following: (1) maintaining and managing tank characterization data and information based on business needs and objectives including transfer of ownership to future contractors; (2) capturing data where it originates and entering it only once to control data consistency, electronic data and information management shall be emphasized to the extent practicable; (3) establishing data quality standards, and managing and certifying databases and data sources against these standards to maintain the proper level of data and information quality consistent with the importance of the data and information, data obtained at high cost with significant implications to decision making regarding tank safety and/or disposal will be maintained and managed at the highest necessary levels of quality; (4) establishing and enforcing data management standards for the Tank Characterization Database (TCD) and supporting data sources including providing mechanisms for discovering and correcting data errors before they propagate; (5) emphasizing electronic data sharing with all authorized users, customers, contractors, and stakeholders to the …
Date:
May 12, 1997
Creator:
Adams, M. R.
Object Type:
Report
System:
The UNT Digital Library
Trade and the Americas
None
Date:
May 12, 2003
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
U.S.-European Union Trade Relations: Issues and Policy Challenges
None
Date:
May 12, 2003
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Development and testing of a method for efficient simulation of evaporation from a seepage face
Evaporation from the surface of a porous medium is a complex process, governed by interplay between (1) coupled liquid and vapor flow in the porous medium, and (2) relative humidity, temperature, and aerodynamic conditions in the surrounding air. In order to avoid the computational expense of explicitly simulating liquid, gas, and heat flow in the porous medium (and the possible further expense of simulating the flow of water vapor in the atmosphere), evaporative potentials can be treated in a simplified manner within a model where liquid is the only active phase. In the case of limited air mixing, evaporation can be approximated as a diffusion process with a linear vapor-concentration gradient. We have incorporated a simplified scheme into the EOS9 module of iTOUGH2 to represent evaporation as isothermal Fickian diffusion. This is notable because the EOS9 module solves a single equation describing saturated and unsaturated flow, i.e., phase transitions and vapor flow are not explicitly simulated. The new approach was applied to three simple problems and the results were compared to those obtained with analytical solutions or the EOS4 module, which explicitly considers advective and diffusive vapor flow. Where vapor flow within the porous medium can be neglected, this new …
Date:
May 12, 2003
Creator:
Ahlers, C. Fredrik; Ghezzehei, Teamrat & Finsterle, Stefan
Object Type:
Article
System:
The UNT Digital Library
Vacuum-ultraviolet (VUV) photoionization of small methanol and methanol-water clusters
In this work we report on thevacuum-ultraviolet (VUV) photoionization of small methanol and methanol-water clusters. Clusters of methanol with water are generated via co-expansion of the gas phase constituents in a continuous supersonic jet expansion of methanol and water seeded in Ar. The resulting clusters are investigated by single photon ionization with tunable vacuumultraviolet synchrotron radiation and mass analyzed using reflectron mass spectrometry. Protonated methanol clusters of the form (CH3OH)nH + (n=1-12) dominate the mass spectrum below the ionization energy of the methanol monomer. With an increase in water concentration, small amounts of mixed clusters of the form (CH3OH)n(H2O)H + (n=2-11) are detected. The only unprotonated species observed in this work are the methanol monomer and dimer. Appearance energies are obtained from the photoionization efficiency (PIE) curves for CH3OH +, (CH 3OH)2 +, (CH3OH)nH + (n=1-9), and (CH 3OH)n(H2O)H + (n=2-9 ) as a function of photon energy. With an increase in the water content in the molecular beam, there is an enhancement of photoionization intensity for methanol dimer and protonated methanol monomer at threshold. These results are compared and contrasted to previous experimental observations.
Date:
May 12, 2008
Creator:
Ahmed, Musahid; Ahmed, Musahid; Wilson, Kevin R.; Belau, Leonid & Kostko, Oleg
Object Type:
Article
System:
The UNT Digital Library
The RHIC Injector Accelerators Configurations, and Performance for the RHIC 2003 Au-D Physics Run.
The RHIC 2003 Physics Run [1] required collisions between gold ions and deuterons. The injector necessarily had to deliver adequate quality (transverse and longitudinal emittance) and quantity of both species. For gold this was a continuing evolution from past work [2]. For deuterons it was new territory. For the filling of the RHIC the injector not only had to deliver quality beams but also had to switch between these species quickly. This paper details the collider requirements and our success in meeting these. Some details of the configurations employed are given.
Date:
May 12, 2003
Creator:
Ahrens, L.; Benjamin, J.; Blaskiewicz, M.; Brennan, J. M.; Brown, K. A.; Carlson, K. A. et al.
Object Type:
Article
System:
The UNT Digital Library
Supernova/Acceleration Probe: A Satellite Experiment to Study the Nature of the Dark Energy
The Supernova/Acceleration Probe (SNAP) is a proposed space-based experiment designed to study the dark energy and alternative explanations of the acceleration of the Universes expansion by performing a series of complementary systematics-controlled astrophysical measurements. We here describe a self-consistent reference mission design that can accomplish this goal with the two leading measurement approaches being the Type Ia supernova Hubble diagram and a wide-area weak gravitational lensing survey. This design has been optimized to first order and is now under study for further modification and optimization. A 2-m three-mirror anastigmat wide-field telescope feeds a focal plane consisting of a 0.7 square-degree imager tiled with equal areas of optical CCDs and near infrared sensors, and a high efficiency low-resolution integral field spectrograph. The instrumentation suite provides simultaneous discovery and light-curve measurements of supernovae and then can target individual objects for detailed spectral characterization. The SNAP mission will discover thousands of Type Ia supernovae out to z = 3 and will obtain high-signal-to-noise calibrated light-curves and spectra for a subset of > 2000 supernovae at redshifts between z = 0.1 and 1.7 in a northern field and in a southern field. A wide-field survey covering one thousand square degrees in both northern and …
Date:
May 12, 2004
Creator:
Aldering, G.; Althouse, W.; Amanullah, R.; Annis, J.; Astier, P.; Baltay, C. et al.
Object Type:
Article
System:
The UNT Digital Library
On the Significance of the Contribution of Multiple-Electron Capture Processes to Cometary X-Ray Emission
We report laboratory studies of the role played by multiple-electron capture (MEC) in solar wind induced cometary X-ray emission. Collisions of Ne{sup 10+} with He, Ne, Ar, CO, and CO{sub 2} have been investigated by means of the traditional singles X-ray spectroscopy in addition to the triple-coincidence measurements of X-rays, scattered projectile, and target recoil ions for the atomic targets. The coincidence measurements enable the reduction of the singles X-ray spectra into partial spectra originating in single-electron capture (SEC) and MEC collisions. The measurements provide unequivocal evidence for a significant role played by MEC, and strongly suggest that models based solely on SEC are bound to yield erroneous conclusions on the solar wind composition and velocities and on cometary atmospheres. The experimental relative importance of MEC collisions is compared with molecular classical-over-the-barrier model (MCBM), classical trajectory Monte Carlo (CTMC), and multi-channel Landau-Zener (MCLZ), calculations which can qualitatively reproduce the experimental trends.
Date:
May 12, 2005
Creator:
Ali, R.; Neill, P. A.; Beiersdorfer, P.; Harris, C. L.; Rakovi?, M. J.; Wang, J. G. et al.
Object Type:
Article
System:
The UNT Digital Library
Congressional Gifts and Travel: Proposals for the 109th Congress
This report provides a brief analysis of the proposal for change introduced or discussed in the 109th Congress and will be updated as events warrant.
Date:
May 12, 2006
Creator:
Amer, Mildred
Object Type:
Report
System:
The UNT Digital Library
High-efficiency photoionization detector
A high efficiency photoionization detector using tetraaminoethylenes in a gaseous state having a low ionization potential and a relative photoionization cross section which closely matches the emission spectrum of xenon gas. Imaging proportional counters are also disclosed using the novel photoionization detector of the invention. The compound of greatest interest is TMAE which comprises tetrakis(dimethylamino)ethylene which has a measured ionization potential of 5.36 +- 0.02 eV, and a vapor pressure of 0.35 torr at 20/sup 0/C.
Date:
May 12, 1981
Creator:
Anderson, D.F.
Object Type:
Patent
System:
The UNT Digital Library
Composition of Matter for Treating Concrete Flooring
Patent for improvements to treating concrete flooring. The process described for mixing animal, mineral, and vegetable waxes to produce a treatment which renders already poured concrete floors (or other cement or stone) dustless and waxy to prevent disintegration of the floor's components.
Date:
May 12, 1917
Creator:
Annan, Alfred H.
Object Type:
Patent
System:
The Portal to Texas History
NATO and the European Union
Report which discusses issues related to the North Atlantic Trade Organization (NATO) and the European Union (EU) including the level of involvement of the entities in using political and military actions to defend against terrorism and proliferation, the types of military forces necessary, the role of the EU in crisis management, the appropriateness of decision-making procedures to respond to emerging threats, and the role of other international institutions.
Date:
May 12, 2005
Creator:
Archick, Kristin & Gallis, Paul E.
Object Type:
Report
System:
The UNT Digital Library
Lifting-Jack.
Patent for "an improved lifting-jack designed expressly for track-levelers, although the construction may be varied for other purposes." (Lines 9-12) Includes instructions and illustrations.
Date:
May 12, 1896
Creator:
Arnold, Raiford A.
Object Type:
Patent
System:
The Portal to Texas History
Disk Cultivator
Patent for improvements to a disk cultivators which allows for the disks to hit the ground at various angles, thus improving cultivation,
Date:
May 12, 1914
Creator:
Atkinson, William H.
Object Type:
Patent
System:
The Portal to Texas History
A Study of Transparent Plastics for use on Aircraft, Special Report
"Various transparent organic plastics, including both commercially available and experimental materials, have been examined to determine their suitability for use as flexible windshields on aircraft, The properties which have been studied include light transmission, haziness, distortion, resistance to weathering, scratch and indentation hardness, impact strength, dimensional stability, resistance to water and various cleaning fluids, bursting strength at normal and low temperatures, and flammability" (p. 1).
Date:
May 12, 1937
Creator:
Axilrod, Benjamin M. & Kline, Gordon M.
Object Type:
Report
System:
The UNT Digital Library
Analysis for Oxide in Thorium Metal
Abstract. to estimate the oxygen picked up by thorium in casting a rapid method of running the acid insoluble content was developed. the quickest procedure consists of reacting with mixed acids, fuming with perchloric and filtration to separate the "free" thorium from the "combined". The precipitate is ignited and weighed as thorium dioxide.
Date:
May 12, 1945
Creator:
Ayers, A. S.
Object Type:
Report
System:
The UNT Digital Library
Congressional Organization for Science and Technology 92nd Congress, 1st Session: A Listing of Congressional Committees and Subcommittees Having Jurisdiction Over Scientific and Technological Activities
This report is an alphabetical collection of every Senate, House, and Joint Committee that show a relation to scientific and technological matters.
Date:
May 12, 1971
Creator:
Ayton, Mauree V.
Object Type:
Report
System:
The UNT Digital Library
MEASURING BETA FUNCTION AND PHASE ADVANCE IN RHIC WITH AN AC DIPOLE.
High energy hadron collider operation requires accurate measurements of the beta functions and phase advances, to check the linear optics and to locate gradient errors. During the RHIC 2003 run, two AC dipoles with vertical and horizontal magnetic field [1] were used to measure the linear optics at storage and at injection energies. The two AC dipoles are set up to adiabatically induce sizable coherent oscillations at a frequency close to the betatron frequencies. The beta functions and phase advances are then calculated from the 1024 turn-by-turn measurements available from all the RHIC BPMs (Beam Position Monitors). Because the coherent excitation is adiabatic, the beam emittance is preserved after the measurement. The algorithm is discussed in this paper, and experimental results are presented.
Date:
May 12, 2003
Creator:
BAI,M. PEGGS,S. ROSER,T. SATOGATA,T.
Object Type:
Article
System:
The UNT Digital Library
MEASUREMENT OF LINEAR COUPLING RESONANCE IN RHIC.
Linear coupling is one of the factors that determine beam lifetime in RHIC. The traditional method of measuring the minimum tune separation requires a tune scan and can't be done parasitically or during the acceleration ramp. A new technique of using ac dipoles to measure linear coupling resonance has been developed at RHIC. This method measures the degree of coupling by comparing the amplitude of the horizontal coherent excitation with the amplitude of the vertical coherent excitation if the beam is excited by the vertical AC dipole and vice versa. One advantage of this method is that it can be done without changing tunes from the normal machine working points. In principle, this method can also localize the coupling source by mapping out the coupling driving terms throughout the ring. This is very useful for local decoupling the interaction regions in RHIC. A beam experiment of measuring linear coupling has been performed in RHIC during its 2003 run, and the analysis of the experimental data is discussed in this paper.
Date:
May 12, 2002
Creator:
BAI,M. PILAT,F. SATOGATA,T. TOMAS,R.
Object Type:
Article
System:
The UNT Digital Library
STOCHASTIC COOLING FOR RHIC.
Emittance growth due to Intra-Beam Scattering significantly reduces the heavy ion luminosity lifetime in RHIC. Stochastic cooling of the stored beam could improve things considerably by counteracting IBS and preventing particles from escaping the rf bucket [1]. High frequency bunched-beam stochastic cooling is especially challenging but observations of Schottky signals in the 4-8 GHz band indicate that conditions are favorable in RHIC [2]. We report here on measurements of the longitudinal beam transfer function carried out with a pickup kicker pair on loan from FNAL TEVATRON. Results imply that for ions a coasting beam description is applicable and we outline some general features of a viable momentum cooling system for RHIC.
Date:
May 12, 2003
Creator:
BLASKIEWICZ,M. BRENNAN,J. M. CAMERON,P. WEI,J.
Object Type:
Article
System:
The UNT Digital Library