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Nonforward parton distributions
Applications of perturbative QCD to deeply virtual Compton scattering and hard exclusive electroproduction processes require a generalization of usual parton distributions for the case when long-distance information is accumulated in nonforward matrix elements <p{prime}{vert_bar}O(0,x){vert_bar}p> of quark and gluon light-cone operators. They describe two types of nonperturbative functions parameterizing such matrix elements: double distributions F(x,y;t) and nonforward distribution functions F{_}/zeta (X;t), discuss their spectral properties, evolution equations which they satisfy, basic uses and general aspects of factorization for hard exclusive processes.
Date:
April 1, 1997
Creator:
A.Radyushkin
Object Type:
Article
System:
The UNT Digital Library
Abilene Philharmonic Playbill: April 12-April 26, 1997
Program for an Abilene Philharmonic concert that ran from April 12th to April 26th (pop seventh and classical eighth concerts) during the 47th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
April 1997
Creator:
Abilene Philharmonic
Object Type:
Pamphlet
System:
The Portal to Texas History
The ATLAS level 2 trigger supervisor.
This paper presents an overview of the hardware and software proposed for the ATLAS level 2 Trigger ROI Builder/Supervisor. The essential requirements of this system are that it operate at the design Level 1 Trigger rate of 100kHz and that it support the technical requirements of the architectures suggested for the ATLAS Level 2 Trigger. Commercial equipment and software support are used to the maximum extent possible, with support from dedicated hardware. Timing requirements and latencies are discussed and simulation results are presented.
Date:
April 3, 1997
Creator:
Abolins, M.; Blair, R. E.; Dawson, J. W.; Owen, D.; Pope, B. G.; Schlereth, J. L. et al.
Object Type:
Article
System:
The UNT Digital Library
Project health and safety plan for the Gunite and Associated Tanks at Oak Ridge National Laboratory, Oak Ridge, Tennessee
The Lockheed Martin Energy Systems, Inc. (Energy Systems) policy is to provide a safe and healthful workplace for all employees and subcontractors. The accomplishment of this policy requires that operations at the Gunite and Associated Tanks (GAAT) in the North and South Tank Farms (NTF and STF) at the Department of Energy (DOE) Oak Ridge National Laboratory are guided by an overall plan and consistent proactive approach to health and safety (H and S) issues. The policy and procedures in this plan apply to all GAAT operations in the NTF and STF. The provisions of this plan are to be carried out whenever activities identifies s part of the GAAT are initiated that could be a threat to human health or the environment. This plan implements a policy and establishes criteria for the development of procedures for day-to-day operations to prevent or minimize any adverse impact to the environment and personnel safety and health and to meet standards that define acceptable management of hazardous and radioactive materials and wastes. The plan is written to utilize past experience and best management practices in order to minimize hazards to human health or the environment from events such as fires, explosions, falls, mechanical …
Date:
April 1, 1997
Creator:
Abston, J. P.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.OVZ001.9258]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "(satellite photo at bottom left, plant at middle right, highway interchange at top center, and more)"
Date:
April 29, 1997
Creator:
Ace Aerial
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Beam Steering and Routing in Quadratic Nonlinear Media
We show how the spatial phase modulation of weak second-harmonic signals controls the overall direction of propagation of spatial solitons in quadratic nonlinear media. We investigate numerically such a process and discuss its applications to all-optical beam routing. 5 refs., 3 figs.
Date:
April 1, 1997
Creator:
Aceves, A. B.; Santos, M. C. & Torner, L.
Object Type:
Report
System:
The UNT Digital Library
Turbine-generator set development for power generation
The goal of this effort was to design, develop, and demonstrate an integrated turbine genset suitable for the power generation requirements of a hybrid automotive propulsion system. The result of this effort would have been prototype generator hardware including controllers for testing and evaluation by Allison Engine Company. The generator would have been coupled to a suitably sized and configured gas turbine engine, which would operate on a laboratory load bank. This effort could lead to extensive knowledge and design capability in the most efficient generator design for hybrid electric vehicle power generation and potentially to commercialization of these advanced technologies. Through the use of the high-speed turbines as a power source for the hybrid-electric vehicles, a significant reduction in nitrous oxides emissions would be achieved when compared to those of conventional gas powered vehicles.
Date:
April 15, 1997
Creator:
Adams, D.J. & Berenyi, S.G.
Object Type:
Report
System:
The UNT Digital Library
Biological monitoring program for East Fork Poplar Creek
In May 1985, a National Pollutant Discharge Elimination System (NPDES) permit was issued for the Oak Ridge Y-12 Plant. As a condition of the permit, a Biological Monitoring and Abatement Program (BMAP) was developed to demonstrate that the effluent limitations established for the Y-12 Plant protect the classified uses of the receiving stream (East Fork Poplar Creek; EFPC), in particular, the growth and propagation of aquatic life (Lear et al. 1989). A second objective of the BMAP is to document the ecological effects resulting from the implementation of a water pollution control program designed to eliminate direct discharges of wastewaters to EFPC and to minimize the inadvertent release of pollutants to the environment. Because of the complex nature of the discharges to EFPC and the temporal and spatial variability in the composition of the discharges, a comprehensive, integrated approach to biological monitoring was developed. A new permit was issued to the Y-12 Plant on April 28, 1995 and became effective on July 1, 1995. Biological monitoring continues to be required under the new permit. The BMAP consists of four major tasks that reflect different but complementary approaches to evaluating the effects of the Y-12 Plant discharges on the aquatic integrity …
Date:
April 18, 1997
Creator:
Adams, S. M.; Ashwood, T. L.; Beaty, T. W.; Brandt, C. C.; Christensen, S. W.; Cicerone, D. S. et al.
Object Type:
Report
System:
The UNT Digital Library
Use of shear-stress-sensitive, temperature-insensitive liquid crystals for hypersonic boundary-layer transition detection
The use of shear-stress-sensitive, temperature-insensitive (SSS/TI) liquid crystals (LCs) has been evaluated as a boundary-layer transition detection technique for hypersonic flows. Experiments were conducted at Mach 8 in the Sandia National Laboratories Hypersonic Wind Tunnel using a flat plate model at near zero-degree angle of attack over the freestream unit Reynolds number range 1.2-5.8x10{sup 6}/ft. Standard 35mm color photography and Super VHS color video were used to record LC color changes due to varying surface shear stress during the transition process for a range of commercial SSS liquid crystals. Visual transition data were compared to an established method using calorimetric surface heat-transfer measurements to evaluate the LC technique. It is concluded that the use of SSS/TI LCs can be an inexpensive, safe, and easy to use boundary-layer transition detection method for hypersonic flows. However, a valid interpretation of the visual records requires careful attention to illumination intensity levels and uniformity, lighting and viewing angles, some prior understanding of the general character of the flow, and the selection of the appropriate liquid crystal for the particular flow conditions.
Date:
April 1, 1997
Creator:
Aeschliman, D.P.; Croll, R.H. & Kuntz, D.W.
Object Type:
Report
System:
The UNT Digital Library
Ensemble: 1997-04-24 - African Percussion Ensemble
Ensemble concert performed at the UNT College of Music Concert Hall.
Date:
April 24, 1997
Creator:
African Percussion Ensemble
Object Type:
Sound
System:
The UNT Digital Library
Microwave joining of SiC ceramics and composites
Potential applications of SiC include components for advanced turbine engines, tube assemblies for radiant burners and petrochemical processing and heat exchangers for high efficiency electric power generation systems. Reliable methods for joining SiC are required in order to cost-effectively fabricate components for these applications from commercially available shapes and sizes. This manuscript reports the results of microwave joining experiments performed using two different types of SiC materials. The first were on reaction bonded SiC, and produced joints with fracture toughness equal to or greater than that of the base material over an extended range of joining temperatures. The second were on continuous fiber-reinforced SiC/SiC composite materials, which were successfully joined with a commercial active brazing alloy, as well as by using a polymer precursor.
Date:
April 1, 1997
Creator:
Ahmad, I.; Silberglitt, R.; Tian, Y.L. & Katz, J.D.
Object Type:
Report
System:
The UNT Digital Library
A new and superior ultrafine cementitious grout
Sealing fractures in nuclear waste repositories concerns all programs investigating deep burial as a means of disposal. Because the most likely mechanism for contaminant migration is by dissolution and movement through groundwater, sealing programs are seeking low-viscosity sealants that are chemically, mineralogically, and physically compatible with the host rock. This paper presents the results of collaborative work directed by Sandia National Laboratories (SNL) and supported by Whiteshell Laboratories, operated by Atomic Energy of Canada, Ltd. The work was undertaken in support of the Waste Isolation Pilot Plant (WIPP), an underground nuclear waste repository located in a salt formation east of Carlsbad, NM. This effort addresses the technology associated with long-term isolation of nuclear waste in a natural salt medium. The work presented is part of the WIPP plugging and sealing program, specifically the development and optimization of an ultrafine cementitious grout that can be injected to lower excessive, strain-induced hydraulic conductivity in the fractured rock termed the Disturbed Rock Zone (DRZ) surrounding underground excavations. Innovative equipment and procedures employed in the laboratory produced a usable cement-based grout; 90% of the particles were smaller than 8 microns and the average particle size was 4 microns. The process involved simultaneous wet pulverization …
Date:
April 1, 1997
Creator:
Ahrens, E. H.
Object Type:
Article
System:
The UNT Digital Library
A distributed computing environment with support for constraint-based task scheduling and scientific experimentation
This paper describes a computing environment which supports computer-based scientific research work. Key features include support for automatic distributed scheduling and execution and computer-based scientific experimentation. A new flexible and extensible scheduling technique that is responsive to a user`s scheduling constraints, such as the ordering of program results and the specification of task assignments and processor utilization levels, is presented. An easy-to-use constraint language for specifying scheduling constraints, based on the relational database query language SQL, is described along with a search-based algorithm for fulfilling these constraints. A set of performance studies show that the environment can schedule and execute program graphs on a network of workstations as the user requests. A method for automatically generating computer-based scientific experiments is described. Experiments provide a concise method of specifying a large collection of parameterized program executions. The environment achieved significant speedups when executing experiments; for a large collection of scientific experiments an average speedup of 3.4 on an average of 5.5 scheduled processors was obtained.
Date:
April 1, 1997
Creator:
Ahrens, J.P.; Shapiro, L.G. & Tanimoto, S.L.
Object Type:
Article
System:
The UNT Digital Library
Oral History Interview with William Akers, April 6, 1997
The National Museum of the Pacific War presents an interview with William Akers. Akers joined the Navy I n1944 and trained at San Diego. After training he went to an air station in California before being assigned to CASU 53 and going to Guam. From there, Akers went to a seaplane base on Saipan aboard the USS Kitkun Bay (CVE-71). On Saipan, he serviced aircraft by refueling and rearming, etc. Akers was discharged in 1946.
Date:
April 6, 1997
Creator:
Akers, William
Object Type:
Text
System:
The Portal to Texas History
The seismology of geothermal regimes. Final report
The authors have been developing seismological interpretation theory and methods applicable to complex structures encountered in geothermal areas for a better understanding of the earth`s geothermal regimes. The questions the y have addressed in their research may be summarized as ``What is going on in the earth`s crust under tectonically active regions; what are the structures and processes responsible for such activities as earthquakes and volcanic eruptions; and how can one capture their essence effectively by means of seismological studies?`` First, the authors found clear evidence for localization of scattered seismic energy in the deep magmatic system of the volcano on the island of Reunion in the Indian Ocean. The seismic coda of local earthquakes show concentrated energy in the intrusive zones as late as 30 to 40 seconds after the origin time. This offers a very effective method for defining a zone of strong heterogeneity on a regional scale, complementary to the high resolution study using trapped modes as pursued in the past project. Secondly, the authors identified about 700 long-period events with various frequencies and durations from the data collected during the past 5 years which included three episodes of eruption. They are applying a finite-element method to …
Date:
April 1, 1997
Creator:
Aki, K.
Object Type:
Report
System:
The UNT Digital Library
The Boerne Star (Boerne, Tex.), Vol. 93, No. 26, Ed. 1 Tuesday, April 1, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
April 1, 1997
Creator:
Aldridge, Leon & D'Amico, Rob
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 93, No. 27, Ed. 1 Friday, April 4, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
April 4, 1997
Creator:
Aldridge, Leon & D'Amico, Rob
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 93, No. 28, Ed. 1 Tuesday, April 8, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
April 8, 1997
Creator:
Aldridge, Leon & D'Amico, Rob
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 93, No. 29, Ed. 1 Friday, April 11, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
April 11, 1997
Creator:
Aldridge, Leon & D'Amico, Rob
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 93, No. 30, Ed. 1 Tuesday, April 15, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
April 15, 1997
Creator:
Aldridge, Leon & D'Amico, Rob
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 93, No. 32, Ed. 1 Tuesday, April 22, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
April 22, 1997
Creator:
Aldridge, Leon & D'Amico, Rob
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 93, No. 34, Ed. 1 Tuesday, April 29, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
April 29, 1997
Creator:
Aldridge, Leon & D'Amico, Rob
Object Type:
Newspaper
System:
The Portal to Texas History
English as the Official Language of the United States: An Overview
None
Date:
April 1, 1997
Creator:
Aleman, Steven R.; Bruno, Andorra & Dale, Charles V.
Object Type:
Report
System:
The UNT Digital Library
English as the Official Language of the United States: An Overview
This report provides background on contemporary efforts to declare English the official language, a review of selected issues raised by official English proposals in Congress, and a summary of arguments that have been advanced in favor of and in opposition to such proposals.
Date:
April 1, 1997
Creator:
Aleman, Steven R.; Bruno, Andorra & Dale, Charles V.
Object Type:
Report
System:
The UNT Digital Library