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N = 2 string amplitudes
In physics, solvable models have played very important roles. Understanding a simple model in detail teaches us a lot about more complicated models in generic situations. Five years ago, C. Vafa and I found that the closed N = 2 string theory, that is a string theory with the N = 2 local supersymmetry on the worldsheet, is classically equivalent to the self-dual Einstein gravity in four spacetime dimensions. Thus this string theory is solvable at the classical level. More recently, we have examined the N = 2 string partition function for spacial compactifications, and computed it to all order in the string perturbation expansion. The fact that such computation is possible at all suggests that the N = 2 string theory is solvable even quantum mechanically.
Date:
August 1, 1995
Creator:
Ooguri, H.
Object Type:
Article
System:
The UNT Digital Library
45-day safety screen results for tank 241-C-204, auger samples 95-Aug-022 and 95-Aug-023
Two auger samples from tank 241-C-204 (C-204) were received at the 222-S Laboratories and underwent safety screening analysis, consisting of differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and total alpha activity. The three samples submitted to energetics determination by DSC exceeded the notification limit. As required by the Tank Characterization Plan, the appropriate notifications were made within 24 hours of official confirmation that the limit was exceeded. Secondary analyses have been initiated. Results from secondary analyses will be included in a revision to this report.
Date:
August 15, 1995
Creator:
Conner, J.M.
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 25, No. 1, Ed. 1 Friday, August 25, 1995
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
August 25, 1995
Creator:
Patton, Eric
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
1994 Triggered Lightning Test Program: Measured responses of a reinforced concrete building under direct lightning attachments
A rocket-triggered lightning test was carried out during the summer of 1994 on a specially designed steel reinforced concrete test building located at Ft. McClellan, Alabama. Currents, voltages, and magnetic fields were measured at 24 instrumented locations during 42 return strokes triggered to designated points on the structure and its lightning protection systems. As was found during an earlier similar lightning test of an earth covered munitions storage building, the buried power service conduits carried a much larger fraction of incident stroke current away from the building than did the intended grounding elements of the lightning protection system. Electrical breakdown and subsequent arcing occurred repeatedly to create dominant current paths to earth that were not accounted for in pretest linear modeling. Potential hazard level transient voltages, surprisingly more resistive than inductive in nature, were recorded throughout the structure. Also surprisingly, strikes to a single grounded protection mast system resulted in internal environments that were generally comparable to those occurring during strikes to roof-mounted air terminals. A description of the test structure, experimental procedures, and a full set of the resultant data are presented in this two-volume report.
Date:
August 1, 1995
Creator:
Schnetzer, G. H.; Chael, J.; Davis, R.; Fisher, R. J. & Magnotti, P. J.
Object Type:
Report
System:
The UNT Digital Library
1994 Triggered lightning test program: Measured responses of a reinforced concrete building under direct lightning attachments, Volume 2: Test data
A rocket-triggered lightning test was carried out during the summer of 1994 on a specially designed steel reinforced concrete test building located at Ft. McClellan, Alabama. Currents, voltages, and magnetic fields were measured at 24 instrumented locations during 42 return strokes triggered to designated points on the structure and its lightning protection system. Detailed descriptions of the test structure, measurements, and test procedures are given in Volume 1 of this report. The present volume contains plots of the complete set of test data.
Date:
August 1, 1995
Creator:
Schnetzer, G. H.; Chael, J. & Davis, R.
Object Type:
Report
System:
The UNT Digital Library
1995 Area 1 bird survey/Zone 1, Operable Unit 2, Robins Air Force Base, Georgia
Robins Air Force Base is located in Warner Robins, Georgia, approximately 90 miles southeast of Atlanta, Georgia. As part of the Baseline Investigation (CDM Federal 1994) a two day bird survey was conducted by M. C. Wade (Oak Ridge National Laboratory) and B.A. Beatty (CDM Federal Programs) in May 1995. The subject area of investigation includes the sludge lagoon, Landfill No. 4, and the wetland area east of the landfill and west of Hannah Road (including two ponds). This is known as Area 1. The Area 1 wetlands include bottomland hardwood forest, stream, and pond habitats. The objectives of this survey were to document bird species using the Area I wetlands and to see if the change in hydrology (due to the installation of the Sewage Treatment Plant effluent diversion and stormwater runon control systems) has resulted in changes at Area 1 since the previous survey of May 1992 (CDM Federal 1994).
Date:
August 1, 1995
Creator:
Wade, M.C.
Object Type:
Report
System:
The UNT Digital Library
The 1995 Japan-U.S. Auto and Parts Trade Dispute: Terms of the Settlement and Implications
On June 28, 1995, the United States and Japan reached a settlement in a long-running dispute over access to Japan's market for automobiles and parts. 100-percent tariffs by the United States on imports of luxury cars from Japan had been threatened under a Section 301 unfair trade practices case dealing with the aftermarket for autoparts in Japan. This report describes the dispute, the settlement, and questions and issues that still remain.
Date:
August 9, 1995
Creator:
Nanto, Dick K. & Bass, Gwenell L.
Object Type:
Report
System:
The UNT Digital Library
3D Plasma Fluid Simulations in Divertor Tokamaks. Final Technical Report, 1993--1995
The main accomplishment of this grant was the development of a finite element time dependent magnetofluid code, FEMHD. The code is nonlinear and three dimensional. In the poloidal plane, the elemental cells of the mesh are triangles, which offer both simplicity and adaptability. In the third, toroidal, direction, there is an option of a standard staggered finite difference mesh, or Fourier transforms. The FEMHD code runs on several platforms, including Crays, UNIX workstations, and a parallel version runs on an IBM SP1. Several problems have been considered with the unstructured mesh FEMHD code. They are (1) MHD simulations in divertor tokamaks; (2) simulations of ELM-like ballooning modes in divertor tokamaks; and (3) reconnection and singular MHD equilibria.
Date:
August 1, 1995
Creator:
Strauss, H. R.
Object Type:
Report
System:
The UNT Digital Library
Ablative material removal utilizing the copper vapor laser
None
Date:
August 1, 1995
Creator:
Warner, B. E.; Boley, C. D.; Chang, J. J.; Dragon, E. P.; Havstad, M. A.; Martinez, M. et al.
Object Type:
Report
System:
The UNT Digital Library
Academic Achievement: Examining the Impact of Community Type at a Small Liberal Arts College in Texas
Hierarchical regression was used to determine if high school community type is an effective predictor of academic success when controlling for demographics, prior academic achievement, socioeconomic status, and current commitment or work habits for students entering Austin College in 1992,1993, and 1994 . Findings revealed that there is a relationship between attending high school in community types of rural and independent town controlling for the effects of SAT scores, high school rank, sex, and late application deposit on first semester grade point average.
Date:
August 1995
Creator:
Rutherford, Janis Pruitt
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Accelerator Research Studies. Final Report, June 1, 1994--May 31, 1995
The Accelerator Research Studies program at the University of Maryland, sponsored by the Department of Energy has completed the third year of its three-year funding cycle and an additional one-year, no-cost extension. The program consisted of the following three tasks: Task A -- Study of the transport and longitudinal compression of intense, high-brightness beams; Task B -- Study of high-brightness beam generation in pseudospark devices; Task C -- Study of a gyroklystron high-power microwave source for linear colliders. The research carried out for each task and progress made is reported.
Date:
August 1, 1995
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Acceptance/operational test procedure 104-AN tank camera purge System and 104-AN video camera system
This Acceptance/Operational Test Procedure will document the satisfactory operation of the 104-AN Camera Purge Control System and 104-AN Video Camera System
Date:
August 1, 1995
Creator:
Castleberry, J.L.
Object Type:
Report
System:
The UNT Digital Library
Acceptance/operational test procedure 105-AN tank camera purge system and 105-AN video camera system
This Acceptance/Operational Test Procedure will document the satisfactory operation of the 105-AN Camera Purge Control System and 105-AN Video Camera System
Date:
August 1, 1995
Creator:
Castleberry, J.L.
Object Type:
Report
System:
The UNT Digital Library
Accident Management & Risk-Based Compliance With 40 CFR 68 for Chemical Process Facilities
A risk-based logic model is suggested as an appropriate basis for better predicting accident progression and ensuing source terms to the environment from process upset conditions in complex chemical process facilities. Under emergency conditions, decision-makers may use the Accident Progression Event Tree approach to identify the best countermeasure for minimizing deleterious consequences to receptor groups before the atmospheric release has initiated. It is concluded that the chemical process industry may use this methodology as a supplemental information provider to better comply with the Environmental Protection Agency`s proposed 40 CFR 68 Risk Management Program rule. An illustration using a benzene-nitric acid potential interaction demonstrates the value of the logic process. The identification of worst-case releases and planning for emergency response are improved through these methods, at minimum. It also provides a systematic basis for prioritizing facility modifications to correct vulnerabilities.
Date:
August 23, 1995
Creator:
O`Kula, K. R.; Taylor, R. P., Jr. & Ashbaugh, S. G.
Object Type:
Article
System:
The UNT Digital Library
Actinide chemistry research supporting the Waste Isolation Pilot Plant (WIPP): FY94 results
This document contains six reports on actinide chemistry research supporting the Waste Isolation Pilot Plant (WIPP). These reports, completed in FY94, are relevant to the estimation of the potential dissolved actinide concentrations in WIPP brines under repository breach scenarios. Estimates of potential dissolved actinide concentrations are necessary for WIPP performance assessment calculations. The specific topics covered within this document are: the complexation of oxalate with Th(IV) and U(VI); the stability of Pu(VI) in one WIPP-specific brine environment both with and without carbonate present; the solubility of Nd(III) in a WIPP Salado brine surrogate as a function of hydrogen ion concentration; the steady-state dissolved plutonium concentrations in a synthetic WIPP Culebra brine surrogate; the development of a model for Nd(III) solubility and speciation in dilute to concentrated sodium carbonate and sodium bicarbonate solutions; and the development of a model for Np(V) solubility and speciation in dilute to concentrated sodium Perchlorate, sodium carbonate, and sodium chloride media.
Date:
August 1995
Creator:
Novak, C. F.
Object Type:
Report
System:
The UNT Digital Library
Activation of shallow dopants in II-VI compounds
The amphoteric native defect model is applied to the understanding of the variations in the dopant activation efficiency in II-VI compounds. It is shown that the location of the common energy reference, the Fermi level stabilization energy, relative to the band edges can be used to determine the doping induced reduction of the formation energy and the enhancement of the concentration of compensating native defects. The model is applied to the most extensively studied compound semiconductors as well as to ternary and quaternary alloys. The effects of the compound ionicity on the dopant activation are briefly discussed.
Date:
August 1, 1995
Creator:
Walukiewicz, W.
Object Type:
Article
System:
The UNT Digital Library
Addendum to the health and safety plan for Waste Area Grouping 6 at Oak Ridge National Laboratory, Oak Ridge, Tennessee. Environmental Restoration Program
There are three purposes for this addendum to the health and safety plan for Waste Area Grouping 6. The first purpose is to provide record of a corrective action response concerning an occurrence on WAG 6 in October 1994 (ORO-MMES-ENVRES-1994-0016.) This occurrence involved a precautionary evacuation of subcontractor field crews due to malfunctioning monitor alarms for organic vapors. The corrective action is to revise the WAG 6 Site health and safety plan to improve communications during emergency events. The second purpose is to incorporate any outstanding health and safety issues not addressed in the original health and safety plan for WAG 6 document (ORNL/ER-183). The only variance of note is tritium air monitoring in the Tumulus building. The tritium air monitor is added in this addendum as monitoring equipment for WAG 6 with description of action level and calibration. The third purpose of this addendum is to satisfy a condition of approval for the pending Nuclear Criticality Safety Assessment (NCSA) pertaining to KEMA fuel storage at WAG 6. This approval condition requires the following: ``The location of the KEMA burial shall be recorded and maintained in a controlled document that identifies the quantity and the general physical conditions at the …
Date:
August 1, 1995
Creator:
Clark, C. Jr.; Burman, S.N. & Wilson, K.A.
Object Type:
Report
System:
The UNT Digital Library
Addendum to the test of CP violation in Tau decay
We discuss the test of CP and CPT violation in Tau decay without using the polarized electron beam by comparing partial fractions of tau(-) and tau(+) decay into channels with strong final state interactions. For example, gamma(tau(-) right arrow pi(-) + pi(0) + nu) not equal gamma(tau(+) right arrow pi(+) + pi(0) + nu) signifies violation of CP. The optimum energy to investigate CP violation in tau decay is discussed. We conclude that this energy is a few MeV below psi(2s) in order to avoid the charm contribution and over abundance of hadrons at the psi(2s) peak.
Date:
August 1, 1995
Creator:
Tsai, Yung Su
Object Type:
Article
System:
The UNT Digital Library
Addressing transportation energy and environmental impacts: technical and policy research directions
The Lawrence Livermore National Laboratory (LLNL) is establishing a local chapter of the University of California Energy Institute (UCEI). In order to most effectively contribute to the Institute, LLNL sponsored a workshop on energy and environmental issues in transportation. This workshop took place in Livermore on August 10 and brought together researchers from throughout the UC systems in order to establish a joint LLNL-UC research program in transportation, with a focus on energy and environmental impacts.
Date:
August 1, 1995
Creator:
Weissenberger, S.; Pasternak, A.; Smith, J. R. & Wallman, H.
Object Type:
Article
System:
The UNT Digital Library
Adequacy of the 123-group cross-section library for criticality analyses of water-moderated uranium systems
In a recent criticality analysis for an array of water-moderated packages containing highly enriched uranium, the 123-group cross-section library in the SCALE system was observed to have a nonconservative discrepancy of approximately 3 to 3.5% when compared with more recently developed libraries. A simple representative system of UO{sub 2}F{sub 2}-H{sub 2}O was used to identify that the problem results from a lack of resonance data for {sup 235}U. Only a single set of self-shielded cross sections, most likely corresponding to a water-moderated infinite dilute system, was provided with the original data. The UO{sub 2}F{sub 2}-H{sub 2}O study indicates that this limitation may cause nonconservative discrepancies as high as 5.5% for some water-moderated, highly enriched uranium systems. Characteristics of the systems where the discrepancy is evident are identified and discussed.
Date:
August 1, 1995
Creator:
Parks, C. V.; Wright, R. Q. & Jordan, W. C.
Object Type:
Report
System:
The UNT Digital Library
Advanced light source vacuum policy and vacuum guidelines for beamlines and experiment endstations
The purpose of this document is to: (1) Explain the ALS vacuum policy and specifications for beamlines and experiment endstations. (2) Provide guidelines related to ALS vacuum policy to assist in designing beamlines which are in accordance with ALS vacuum policy. This document supersedes LSBL-116. The Advanced Light Source is a third generation synchrotron radiation source whose beam lifetime depends on the quality of the vacuum in the storage ring and the connecting beamlines. The storage ring and most of the beamlines share a common vacuum and are operated under ultra-high-vacuum (UHV) conditions. All endstations and beamline equipment must be operated so as to avoid contamination of beamline components, and must include proper safeguards to protect the storage ring vacuum from an accidental break in the beamline or endstation vacuum systems. The primary gas load during operation is due to thermal desorption and electron/photon induced desorption of contaminants from the interior of the vacuum vessel and its components. The desorption rates are considerably higher for hydrocarbon contamination, thus considerable emphasis is placed on eliminating these sources of contaminants. All vacuum components in a beamline and endstation must meet the ALS vacuum specifications. The vacuum design of both beamlines and endstations …
Date:
August 1, 1995
Creator:
Hussain, Z.
Object Type:
Report
System:
The UNT Digital Library
Advanced Neutron Source Dynamic Model (ANSDM) code description and user guide
A mathematical model is designed that simulates the dynamic behavior of the Advanced Neutron Source (ANS) reactor. Its main objective is to model important characteristics of the ANS systems as they are being designed, updated, and employed; its primary design goal, to aid in the development of safety and control features. During the simulations the model is also found to aid in making design decisions for thermal-hydraulic systems. Model components, empirical correlations, and model parameters are discussed; sample procedures are also given. Modifications are cited, and significant development and application efforts are noted focusing on examination of instrumentation required during and after accidents to ensure adequate monitoring during transient conditions.
Date:
August 1, 1995
Creator:
March-Leuba, J.
Object Type:
Report
System:
The UNT Digital Library
The Advanced Neutron Source liquid deuterium cold source
The Advanced Neutron Source will employ two cold sources to moderate neutrons to low energy (<10 meV). The cold neutrons produced are then passed through beam guides to various experiment stations. Each cold source moderator is a sphere of 410-mm internal diameter. The moderator material is liquid deuterium flowing at a rate of 1 kg/s and maintained at subcooled temperatures at all points of the circuit, to prevent boiling. Nuclear beat deposited within the liquid deuterium and its containment structure totals more than 30 kW. All of this heat is removed by the liquid deuterium, which raises its temperature by 5 K. The liquid prime mover is a cryogenic circulator that is situated in the return leg of the flow loop. This arrangement minimizes the heat added to the liquid between the heat exchanger and the moderator vessel, allowing the moderator to be operated at the minimum practical temperature. This report describes the latest thinking at the time of project termination. It also includes the status of various systems at that time and outlines anticipated directions in which the design would have progressed. In this regard, some detail differences between this report and official design documents reflect ideas that were …
Date:
August 1, 1995
Creator:
Lucas, A.T.
Object Type:
Report
System:
The UNT Digital Library
Advanced Neutron Source radiological design criteria
The operation of the proposed Advanced Neutron Source (ANS) facility will present a variety of radiological protection problems. Because it is desired to design and operate the ANS according to the applicable licensing standards of the Nuclear Regulatory Commission (NRC), it must be demonstrated that the ANS radiological design basis is consistent not only with state and Department of Energy (DOE) and other usual federal regulations, but also, so far as is practicable, with NRC regulations and with recommendations of such organizations as the Institute of Nuclear Power Operations (INPO) and the Electric Power Research Institute (EPRI). Also, the ANS radiological design basis is in general to be consistent with the recommendations of authoritative professional and scientific organizations, specifically the National Council on Radiation Protection and Measurements (NCRP) and the International Commission on Radiological Protection (ICRP). As regards radiological protection, the principal goals of DOE regulations and guidance are to keep occupational doses ALARA [as low as (is) reasonably achievable], given the current state of technology, costs, and operations requirements; to control and monitor contained and released radioactivity during normal operation to keep public doses and releases to the environment ALARA; and to limit doses to workers and the public …
Date:
August 1, 1995
Creator:
Westbrook, J.L.
Object Type:
Report
System:
The UNT Digital Library