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Theoretical modeling and experimental characterization of planar defects in Y sub 2 Ba sub 4 Cu sub 6+x O sub 14+x
Crystallographic defects and phase transformations in the system Y{sub 2}Ba{sub 4}Cu{sub 6 + x}O{sub 14 + x}(0{le}{times}{le}4) are investigated by high resolution transmission electron microscopy (TEM) and static lattice, three dimensional Monte Carlo computer simulations. High resolution images of partially transformed (x = 2 to x = 1) material reveal a prevalence of CuO planar defects (stacking faults) associated with the transformation and an absence of disturbance to the perovskite Ba-Y-Ba blocks. An atomic mechanism involving the intercalculation and removal of extra CuO planes by partial dislocation climb, and requiring only a-b plane diffusion, is developed for the formation of such planar defects during changes in the layered YBaCuO crystal structure. Monte Carlo simulations based on the proposed transformation mechanism accurately reproduce the observed defects and known equilibrium structures. 24 refs., 4 figs.
Date:
November 1, 1990
Creator:
Burmester, C. P.; Fendorf, M.; Gronsky, R. & Wille, L. T.
Object Type:
Article
System:
The UNT Digital Library
Annual review of cultural resource investigations by the Savannah River Archaeological Research Program, fiscal year 1990
The Savannah River Archaeological Research Program (SRARP) of the South Carolina Institute of Archaeology and Anthropology, University of South Carolina, is funded through a direct contract with the United States Department of Energy to provide services required under federal law for the protection and management of archaeological resources on the Savannah River Site (SRS). Because the significance of most archaeological resources is dependent upon research potential, the SRARP is guided by research objectives. An on-going research program provides the problems, methods and means of assessing site significance within the compliance process specified by law. In addition, the SRARP maintains an active program of public education to disseminate knowledge about prehistory and history, and to enhance public awareness about historic preservation. The following report summarizes the management, research and public education activities of the SRARP during Fiscal Year 1990.
Date:
November 1, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Basic features of coherent radiation generated by relativistic charge bunches
Radiation generated by relativistic charges can be analyzed and described in exquisite detail. One reason that such detailed analysis is possible is because the phases of radiated photons often are determined completely by the initial conditions of the relativistic charges and the radiating system. The phase relationships between the initial charges and the radiated photons represent coherence in the emitted radiation. A previous paper described how this coherence could affect the spatial and spectral distributions of radiation generated by a single charge in a periodic radiator. The present paper discusses a complementary issue; namely, how the temporal shape of a relativistic charge bunch can emphasize specific features of the radiation generated at a single interaction site. 3 refs., 4 figs.
Date:
November 1, 1990
Creator:
Moran, M. J. & Chang, B.
Object Type:
Article
System:
The UNT Digital Library
Genetic changes in Mammalian cells transformed by helium cells
Midterm Syrian Hamster embryo (SHE) cells were employed to study high LET-radiation induced tumorigenesis. Normal SHE cells (secondary passage) were irradiated with accelerated helium ions at an incident energy of 22 MeV/u (9--10 keV/{mu}m). Transformed clones were isolated after growth in soft agar of cells obtained from the foci of the initial monolayer plated postirradiation. To study the progression process of malignant transformation, the transformed clones were followed by monolayer subculturing for prolonged periods of time. Subsequently, neoplasia tests in nude mice were done. In this work, however, we have focused on karyotypic changes in the banding patterns of the chromosomes during the early part of the progressive process of cell transformation for helium ion-induced transformed cells. 26 refs., 5 figs., 2 tabs.
Date:
November 1, 1990
Creator:
Durante, M.; Grossi, G. (Naples Univ. (Italy). Dipt. di Scienze Fisiche); Yang, T.C. & Roots, R. (Lawrence Berkeley Lab., CA (USA))
Object Type:
Article
System:
The UNT Digital Library
An evaluation of the Nb-93(n,n prime )Nb-93m dosimeter reaction for ENDF/B-VI
The Nb-93(n,n{prime})Nb-93m reaction plays an important role in nuclear energy applications. Because of its low threshold energy and relatively long half-life, it is a desirable reaction for long-term neutron fluence dosimetry in nuclear fission reactors. An evaluation of the differential cross section for this reaction was completed in 1985 by this laboratory as part of a comprehensive effort involving all neutron cross sections for niobium. The objective was to provide input for ENDF/B-VI. It was difficult to produce a reliable evaluation for this reaction in 1985 because the information available then was sparse and quite uncertain. In fact, that evaluation was based entirely on nuclear model calculations. The evaluated cross sections below 0.7 MeV were derived from calculations carried out in this laboratory, while the higher energy values were obtained from the work of Strohmaier and co-workers. In 1985 there was only one published experimental differential cross section value to consider for this reaction. Even the half-life of Nb-93m was in serious doubt. During the five years between the completion of the earlier evaluation and the finalization of ENDF/B-VI there have been some significant improvements and additions to the experimental database for this reaction. Also, new model calculations have been …
Date:
November 1, 1990
Creator:
Smith, D. L. & Geraldo, L. P.
Object Type:
Report
System:
The UNT Digital Library
[Letter from Raymond B. Kelly III to D. Jack Davis, November 1, 1990]
Photocopy of a letter from Raymond B. Kelly III to D. Jack Davis about the NTIEVA grant application to the Community Cultural Grants Program. Kelly writes that due to the program not meeting all requirements the request was not approved. A stamp notes that the document was received on November 5, 1990.
Date:
November 1, 1990
Creator:
Kelly, Raymond B., III
Object Type:
Letter
System:
The UNT Digital Library
Proof-of-Concept Oil Shale Facility Environmental Analysis Program
The objectives of the Project are to demonstrate: (1) the Modified In- Situ (MIS) shale oil extraction process and (2) the application of CFBC technology using oil shale, coal and waste gas streams as fuels. The project will focus on evaluating and improving the efficiency and environmental performance of these technologies. The project will be modest by commercial standards. A 17-retort MIS system is planned in which two retorts will be processed simultaneously. Production of 1206-barrels per calendar day of raw shale oil and 46-megawatts of electricity is anticipated. West Virginia University coordinated an Environmental Analysis Program for the Project. Experts from around the country were retained by WVU to prepare individual sections of the report. These experts were exposed to all of OOSI's archives and toured Tract C-b and Logan Wash. Their findings were incorporated into this report. In summary, no environmental obstacles were revealed that would preclude proceeding with the Project. One of the most important objectives of the Project was to verify the environmental acceptability of the technologies being employed. Consequently, special attention will be given to monitoring environmental factors and providing state of the art mitigation measures. Extensive environmental and socioeconomic background information has been compiled …
Date:
November 1, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Vibration study of the APS magnet support assemblies
Stability of the positron closed orbit is a requirement for successful operation of the Advanced Photon Source. The fact that vibration of the storage ring quadrupole magnets can lead to distortion of the positron closed orbit and to potentially unacceptable beam emittance growth provides the motivation for the subject studies. Low frequency vibrations can be controlled with steering magnets using feedback systems, provided the vibration amplitudes are within the dynamic range of the controllers. High frequency vibration amplitudes, on the other hand, are out of the range of the controller and, therefore must be limited to ensure the emittance growth will not exceed a prescribed value. Vibration criteria were developed based on the requirement that emittance growth be limited to 10 percent. Recognizing that the quadrupole magnets have the most significant effect, three different scenarios were considered: vibration of a single quadrupole within the storage ring, random vibration of all the quadrupoles in the ring, and the hypothetical case of a plane wave sweeping across the site and the quadrupoles following the motion of the plane wave. The maximum allowable peak vibration amplitudes corresponding to these three vibration scenarios are given. The criteria associated with the passage of a plane …
Date:
November 1, 1990
Creator:
Wambsganss, M.W.; Jendrzejczyk, J.A. & Chen, S.S.
Object Type:
Report
System:
The UNT Digital Library
The structure and faceting behavior of tilt grain boundaries in aluminum
This work describes a number of experimental observations on the structure and behavior of {Sigma}99 and other near-90{degree} <110> tilt boundaries in bicrystals of aluminum. The continuous bicrystal structure employed in these studies is based on the symmetry properties inherent in heteroepitaxial growth. A thin film grown in this geometry consists of intertwined grains surrounding each other but with only two grain orientations.
Date:
November 1, 1990
Creator:
Dahmen, U.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0254.0302]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Oklahoma City manger Paula Hearn shovels asphalt into a pothole at NE 16 and Eagle Lane."
Date:
November 1, 1990
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0333.0251]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Helen King of Altus has turned her mail-order clock business into an international success."
Date:
November 1, 1990
Creator:
Long, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0145.0107]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Patty Coupens / Access Cab."
Date:
November 1, 1990
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0155.0304]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Owen Davison has regained the little black book he carried during World War II."
Date:
November 1, 1990
Creator:
James, Louise B.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0120.0046]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Putnam North's Dustin Caldwell races toward the goal line in Thursday's game against Lawton Ike."
Date:
November 1, 1990
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0120.0044]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Putnam North's Dustin Caldwell is stopped short of the goal line as he attempts to dive in for a TD in Thursday's showdown with Lawton Ike."
Date:
November 1, 1990
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Iraq-Kuwait: U.N. Security Council Resolutions -- Texts and Votes
The Iraqi invasion of Kuwait on August 1-2, 1990, set into motion a series of actions by the United Nations Security Council. Between August 2 and December 4, 1990, the Council adopted 12 resolutions. The numbers and votes of those resolutions are listed and the full text of each resolution is included in the this report.
Date:
November 1, 1990
Creator:
Browne, Marjorie Ann
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0095.0584]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Gwendy Kem, left, visits with Andy and Vicki Bogert at the Men in the News party."
Date:
November 1, 1990
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0314B.0300]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Ballot bloopers, mechanical muddles and jumpin' jailbirds -- all have contributed to headaches for election board secretaries in Oklahoma."
Date:
November 1, 1990
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Compilation of Failure Data and Fault Tree Analysis for Geothermal Energy Conversion Systems
The failure data for geothermal energy conversion facilities collected to date are compiled and tabled. These facilities have not accumulated sufficient production history to reliably estimated component failure rates. In addition, the improvements made in drilling technology in recent years may have made less pertinent the accumulation of data on well failures.
Date:
November 1, 1990
Creator:
Miller, F.L., Jr. & Zimmerman, D.E.
Object Type:
Report
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 82, No. 44, Ed. 1 Thursday, November 1, 1990
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
November 1, 1990
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
Regional aerosol deposition in human upper airways
During the current reporting period experimental studies of aerosol deposition in replicate NOPL airways have carried out. A replicate model of a 4 week old infant nasal passage was constructed from MR scans. The model completes the age range from newborn'' to 4 years, there now being one child model for 4 different ages. Deposition studies have been performed with unattached radon progeny aerosols in collaboration with ITRI, Albuquerque, NM and NRPB, Chilton, UK. Overall measurements have been performed in adult and child nasal airways indicating that the child nasal passage was slightly more efficient than the adult in removing 1 nm particles at corresponding flow rates. A similar weak dependence on flow rate was observed. Local deposition studies in an adult nasal model indicated predominant deposition in the anterior region during inspiratory flow, but measurable deposition was found throughout the model. The deposition pattern during expiration was reverse, greater deposition being observed in the posterior region. Local deposition studies of attached progeny aerosol size (100--200 nm) were performed in adult and child nasal models using technigas'' and a gamma scintillation camera. Similar to the unattached size, deposition occurred throughout the models, but was greater in the anterior region.
Date:
November 1, 1990
Creator:
Swift, D. L.
Object Type:
Report
System:
The UNT Digital Library
Defect Dependence of Positron Lifetimes in Oxide Superconductors
First principles calculations of the positron lifetimes are used to interpret experimental lifetime data for Ba{sub 1-x}K{sub x}BiO{sub 3}. The observed lifetimes are found to be very sensitive to the presence of defects in the sample. The temperature dependence of the lifetime and the change in lifetime with sample aging are both attributed to defects. The qualitative differences between metal vacancy defects and oxygen vacancy defects in metal oxides are also discussed. 6 refs., 2 figs.
Date:
November 1, 1990
Creator:
Sterne, P. A.; O'Brien, J. C.; Howell, R. H. & Kaiser, J. H.
Object Type:
Article
System:
The UNT Digital Library
Environmental audit, Bonneville Power Administration, lower Columbia area
This report documents the results of the US Department of Energy's (DOE's) Environmental Audit conducted by the DOE Headquarters Office of Environmental Audit within the Bonneville Power Administration's (BPA's) Lower Columbia Area. The BPA facilities included in the Audit are the Ross Complex in Vancouver, Washington; the substations of North Bonneville, North Bonneville Annex, Camas, and Longview within the state of Washington; and the Acton and Troutdale Substations within the state of Oregon. The independent Audit was conducted by a team of professionals from DOE and contractors. The purpose of the Audit is to provide the Secretary of Energy, Admiral James D. Watkins, Ret., with the status of environmental programs within BPA's Lower Columbia Area. The Environmental Audit team identified 25 findings dealing with the lack of conformance with federal and state laws and regulations and DOE Orders, and 7 findings in which BMPs were not attained. Although all findings require corrective action, none required cessation of operations or reflect situations that present an immediate risk to public health or the environment. The Audit team noted inadequacies in PCB management included storage, labeling, reporting, and spill control. The most significant causal factors for the findings include lack of policy implementation …
Date:
November 1, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Summary of 1988 WIPP (Waste Isolation Pilot Plant) Facility horizon gas flow measurements
Numerous gas flow measurements have been made at the Waste Isolation Pilot Plant (WIPP) Facility horizon during 1988. All tests have been pressure decay or constant pressure tests from single boreholes drilled from the underground excavations. The test fluid has been nitrogen. The data have been interpreted as permeabilities and porosities by means of a transient numerical solution method. A closed-form steady-state approximation provides a reasonable order-of-magnitude permeability estimate. The effective resolution of the measurement system is less than 10{sup {minus}20} m{sup 2}. Results indicate that beyond 1 to 5 m from an excavation, the gas flow is very small and the corresponding permeability is below the system resolution. Within the first meter of an excavation, the interpreted permeabilities can be 5 orders of magnitude greater than the undisturbed or far-field permeability. The interpreted permeabilities in the region between the undisturbed region and the first meter from an excavation are in the range of 10{sup {minus}16} to 10{sup {minus}20} m{sup 2}. Measurable gas flow occurs to a greater depth into the roof above WIPP excavations of different sizes and ages than into the ribs and floor. The gas flows into the formation surrounding the smallest excavation tested are consistently lower …
Date:
November 1, 1990
Creator:
Stormont, J.C.
Object Type:
Report
System:
The UNT Digital Library