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Assessment of radiation exposure for materials in the LANSCE Spallation Irradiation Facility
Materials samples were irradiated in the Los Alamos Radiation Effects Facility (LASREF) at the Los Alamos Neutron Science Center (LANSCE) to provide data for the Accelerator Production of Tritium (APT) project on the changes in mechanical and physical properties of materials in a spallation target environment. The targets were configured to expose samples to a variety of radiation environments including high-energy protons, mixed protons and neutrons, and predominantly neutrons. The irradiation was driven by an 800 MeV 1 mA proton beam with a circular Gaussian shape of approximately 2{sigma} = 3.5 cm. Two irradiation campaigns were conducted in which samples were exposed for approximately six months and two months, respectively. At the end of this period, the samples were extracted and tested. Activation foils that had been placed in proximity to the materials samples were used to quantify the fluences in various locations. The STAYSL2 code was used to estimate the fluences by combining the activation foil data with calculated data from the LAHET Code System (LCS) and MCNPX. The exposure for each sample was determined from the estimated fluences using interpolation based on a mathematical fitting to the fluence results. The final results included displacement damage (dpa) and gas …
Date:
January 1, 2001
Creator:
James, M. R. (Michael R.); Maloy, S. A. (Stuart A.); Sommer, W. F. (Walter F.), Jr.; Fowler, Malcolm M.; Dry, D. E. (Donald E.); Ferguson, P. D. (Phillip D.) et al.
Object Type:
Article
System:
The UNT Digital Library
Astronomical and physical data for meteoroids recorded by the Altair radar
We present preliminary results of orbital and physical measurements of a small selection of meteoroids observed at UHF frequencies by the ALTAIR radar on Kwajalein Island on November 17, 1998. The head echoes observed by ALTAIR allowed precise determination of velocities and decelerations from which orbits and masses of individual meteoroids derived from numerical modelling have been measured. During these observations, the ALTAIR radar detected average head echo rates of 1665 per hour.
Date:
January 1, 2001
Creator:
Brown, P. G. (Peter G.) & ReVelle, D. O. (Douglas O.)
Object Type:
Article
System:
The UNT Digital Library
AT 01-8
This painting is predominately black with some vertical white and pink scrapes.
Date:
2001
Creator:
Falsetta, Vincent
Object Type:
Artwork
System:
The UNT Digital Library
AT 01-8, AV 01-10, AU 01-9, BI 02-8, BJ 02-9, BS 03-7
None
Date:
2001/2003
Creator:
Falsetta, Vincent
Object Type:
Artwork
System:
The UNT Digital Library
[At the Dallas Hispanic Expo]
Photograph of people visiting the booths and tables at the Dallas Hispanic Expo. On a white board is a sign reading "Viva Dallas! Hispanic Expo". The room is filled with many people at various booths. Decorations include sombreros, serapes, and a piñata.
Date:
January 1, 2001
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
Atomistic Simulation of Dislocation-Defect Interactions in Cu
The mechanisms of dislocation-defect interactions are of practical importance for developing quantitative structure-property relationships, mechanistic understanding of plastic flow localization and predictive models of mechanical behavior in metals under irradiation. In copper and other face centered cubic metals, high-energy particle irradiation produces hardening and shear localization. Post-irradiation microstructural examination in Cu reveals that irradiation has produced a high number density of nanometer sized stacking fault tetrahedra. Thus, the resultant irradiation hardening and shear localization is commonly attributed to the interaction between stacking fault tetrahedra and mobile dislocations, although the mechanism of this interaction is unknown. In this work, we present a comprehensive molecular dynamics simulation study that characterizes the interaction and fate of moving dislocations with stacking fault tetrahedra in Cu using an EAM interatomic potential. This work is intended to produce atomistic input into dislocation dynamics simulations of plastic flow localization in irradiated materials.
Date:
January 1, 2001
Creator:
Wirth, B D; Bulatov, V V & Diaz de la Rubia, T
Object Type:
Article
System:
The UNT Digital Library
[Attendees at SRC groundbreaking]
Photograph of attendees at the groundbreaking for Pohl Recreation Center on the UNT campus. Individuals can be seen standing on a dirt plot with their backs turned to the camera, facing a group of people with yellow safety helmets and shovels. One man in the foreground is wearing a shirt that reads, "UNIVERSITY OF NORTH TEXAS RECREATIONAL SPORTS [--] STAFF."
Date:
2001/2002
Creator:
University of North Texas. Center for Media Production.
Object Type:
Photograph
System:
The UNT Digital Library
Attractor states and quantum instabilities in de Sitter space
The asymptotic behavior of the energy-momentum tensor for a free quantized scalar field with mass m and curvature coupling {zeta} in de Sitter space is investigated. It is shown that for an arbitrary, homogeneous and isotropic, fourth order adiabatic state for which the two-point function is infrared finite, <T{sub ab}> approaches the Bunch-Davies de Sitter invariant value at late times if m{sup 2} + {zeta}R > 0. In the case m = {zeta} = 0, the energy-momentum tensor approaches the de Sitter invariant Allen-Folacci value for such a state. For m{sup 2} + {zeta}R = 0, but m and {zeta} not separately zero it is shown that at late times <T{sub ab}> grows linearly in terms of cosmic time leading to an instability of de Sitter space. The asymptotic behavior is again independent of the state of the field. For m{sup 2} + {zeta}R < 0, it is shown that, for most values of m and {zeta}, <T{sub ab}> grows exponentially in terms of cosmic time at late times in a state dependent manner.
Date:
January 1, 2001
Creator:
Anderson, P. R. (Paul R.); Eaker, W. (Wayne); Habib, S. (Salman); Molina-Paris, Carmen & Mottola, E. (Emil)
Object Type:
Article
System:
The UNT Digital Library
Attribute measurement systems prototypes and equipment in the United States.
Since the fall of 1997, the United States has been developing prototypical attribute verification technology for potential use by the International Atomic Energy Agency (IAEA) under the Trilateral Initiative. The first attribute measurement equipment demonstration took place in December 1997 at the Lawrence Livermore National Laboratory. This demonstration led to a series of joint Russian Federatioin/US/IAEA technical discussions that focused on attribute measurement technology that could be applied to plutonium bearing items having classified characteristics. A first prototype attribute verification system with an information barrier was demonstrated at a Trilateral Technical Workshop in June 1999 at Los Alamos. This prototype nourished further fruitful discussions between the three parties that has in turn led to the documents discussed in a previous paper. Prototype development has continued in the US, under other initiatives, using an integrated approach that includes the Trilatleral Initiative. Specifically for the Trilateral Initiative, US development has turned to some peripheral equipment that would support verifications by the IAEA. This equipment includes an authentication tool for measurement systems with information barriers and in situ probes that would facilitate inspections by reducing the need to move material out of storage locations for reverification. In this paper, we will first summarize …
Date:
January 1, 2001
Creator:
Langner, D. C. (Diana C.); Landry, R. P. (Robert P.); Hsue, S.-T. (Sin-Tao); MacArthur, D. W. (Duncan W.); Mayo, D. R. (Douglas R.); Smith, M. K. (Morag K.) et al.
Object Type:
Article
System:
The UNT Digital Library
AU 01-9
This painting is predominately white with pink and black vertical scrapes.
Date:
2001
Creator:
Falsetta, Vincent
Object Type:
Artwork
System:
The UNT Digital Library
L'aube célestre
Access:
Use of this item is restricted to the UNT Community
Recording of Delphine Dupre's L'aube célestre. This work is based off of the theme "starry night" and includes various sampled sequences and mixes. It is composed of two moving pieces that move towards each other from dark to light.
Date:
2001
Creator:
Dupre, Delphine
Object Type:
Sound
System:
The UNT Digital Library
An Audit of the General Land Office Asset Management Division
Report of the Texas State Auditor's Office related to the management and internal controls of the General Land Office (Land Office) Asset Management Division, and the processes used by the Division to identify underused agency land, recommend the disposition of such land, and implement authorized recommendations.
Date:
January 2001
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on the Financial Statements of the Teacher Retirement System of Texas for the Fiscal Year Ended August 31, 2000
Report of the Texas State Auditor's Office related to financial statements from the Teacher Retirement System, which were accurately stated in accordance with generally accepted accounting principles.
Date:
January 2001
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on the Integrated Statewide Administrative System at Selected Agencies
Report of the Texas State Auditor's Office related to determining if Integrated Statewide Administrative System (ISAS) installations had been successfully implemented to allow ISAS to produce reliable financial information.
Date:
January 2001
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
Augustine's Message
Access:
Use of this item is restricted to the UNT Community
Recording of Robert Andrew Mackay Augustine's Message. This is a work for voice and electronics. It includes samples of text from the book of Romans in the Bible.
Date:
2001
Creator:
Mackay, Robert Andrew
Object Type:
Sound
System:
The UNT Digital Library
Authentication of quantum messages.
Authentication is a well-studied area of classical cryptography: a sender A and a receiver B sharing a classical private key want to exchange a classical message with the guarantee that the message has not been modified or replaced by a dishonest party with control of the communication line. In this paper we study the authentication of messages composed of quantum states. We give a formal definition of authentication in the quantum setting. Assuming A and B have access to an insecure quantum channel and share a private, classical random key, we provide a non-interactive scheme that both enables A to encrypt and authenticate (with unconditional security) an m qubit message by encoding it into m + s qubits, where the probability decreases exponentially in the security parameter s. The scheme requires a private key of size 2m + O(s). To achieve this, we give a highly efficient protocol for testing the purity of shared EPR pairs. It has long been known that learning information about a general quantum state will necessarily disturb it. We refine this result to show that such a disturbance can be done with few side effects, allowing it to circumvent cryptographic protections. Consequently, any scheme to …
Date:
January 1, 2001
Creator:
Barnum, Howard; Crépeau, Jean-Claude; Gottesman, D. (Daniel); Smith, A. (Adam) & Tapp, Alan
Object Type:
Article
System:
The UNT Digital Library
Auto portrait
Access:
Use of this item is restricted to the UNT Community
Recording of Pierre Alexandre Tremblay's Auto portrait. This work was commissioned by the Rien à voir festival to mark its tenth anniversary and premiered during the Rien à voir concert series presented by Réseaux at Espace GO in Montréal. Like the title suggests, this piece is meant to act as a means for reflection, introspection, and renewed consciousness.
Date:
2001
Creator:
Tremblay, Pierre Alexandre
Object Type:
Sound
System:
The UNT Digital Library
Automated component creation for legacy C++ and fortran codes.
A significant amount of work has been spent creating component models and programming environments, but little support exists for automation in the process of creating components from existing codes. To entice users to adopt the component-based paradigm over traditional programming models, integration of legacy codes must be as simple and fast as possible, We present a system for automating the IDL generation stage of component development based on source code analysis of legacy C, C-t-4 and Fortran codes using the Program Database Toolkit. Together with IDL compilation tools such as Babel, we provide an alternative to hand-written IDL code for legacy applications and libraries. In addition to generating IDL, we propose an XML-based method for specifying meta-data related to type mapping and wrapper generation that can be shared between our tools and IDL compilers. The component model of choice for this work is the Common Component Architecture (CCA) using the Scientific Interface Definition Language (SIDL), though the concepts presented can be applied to other models.
Date:
January 1, 2001
Creator:
Sottile, M. J. (Matthew J.) & Rasmussen, C. E. (Craig E.)
Object Type:
Article
System:
The UNT Digital Library
AUTOMATED UTILITY SERVICE AREA ASSESSMENT UNDER EMERGENCY CONDITIONS
All electric utilities serve power to their customers through a variety of functional levels, notably substations. The majority of these components consist of distribution substations operating at lower voltages while a small fraction are transmission substations. There is an associated geographical area that encompasses customers who are served, defined as the service area. Analysis of substation service areas is greatly complicated by several factors: distribution networks are often highly interconnected which allows a multitude of possible switching operations; also, utilities dynamically alter the network topology in order to respond to emergency events. As a result, the service area for a substation can change radically. A utility will generally attempt to minimize the number of customers outaged by switching effected loads to alternate substations. In this manner, all or a portion of a disabled substation's load may be served by one or more adjacent substations. This paper describes a suite of analytical tools developed at Los Alamos National Laboratory (LANL), which address the problem of determining how a utility might respond to such emergency events. The estimated outage areas derived using the tools are overlaid onto other geographical and electrical layers in a geographic information system (GIS) software application. The effects …
Date:
January 1, 2001
Creator:
TOOLE, G. & LINGER, S.
Object Type:
Article
System:
The UNT Digital Library
AV 01-10
This oil painting is predominately pink with vertical scrapes of black and white.
Date:
2001
Creator:
Falsetta, Vincent
Object Type:
Artwork
System:
The UNT Digital Library
AVAILABILITY MODEL FOR THE SNS LINAC RF SYSTEM
The Linac RF system is broken down into eight major components for this model. These components are: the klystrons, the waveguide, the water loads, the circulators, the converter/modulator, the transmitter, the window, and the low level RF (LLRF) controls. The mean time between failures (MTBF) for several of the components vary with voltage or klystron power level, and this variation is discussed below. In general, these MTBF's are design requirements supplied to the vendors of the subsystems, and verified at design reviews and by the experience at other accelerators. We assume that the scheduled operational time for the SNS is 6000 hours per year, and use this number to calculate the availability. We have to calculate the total down time during the 6000 hours of operation, and the availability is defined as one minus the unexpected down time for the year, divided by the number of operating hours in the year. Ideally, we would use distributions of MTBF's and MTTR's, since each failure will be different, but the equipment is not yet built, so the distributions are not available, and we make the assumption of constant MTBF and MTTR.
Date:
January 1, 2001
Creator:
Tallerico, P. J. (Paul J.); Rees, D. E. (Daniel E.) & Anderson, D. E. (David E.)
Object Type:
Article
System:
The UNT Digital Library
AW 01-11
This oil painting is predominately green with vertical marks and lines of black and white broken by some horizontal implied lines.
Date:
2001
Creator:
Falsetta, Vincent
Object Type:
Artwork
System:
The UNT Digital Library
AX 01-12
This abstract painting is predominately white with black, gray and green vertical marks interrupted by some horizontal implied lines.
Date:
2001
Creator:
Falsetta, Vincent
Object Type:
Artwork
System:
The UNT Digital Library
BA 01-15
This abstract painting consists of pink and gray vertical strokes with some green and black smaller vertical strokes.
Date:
2001
Creator:
Falsetta, Vincent
Object Type:
Artwork
System:
The UNT Digital Library