Search Results

Advanced search parameters have been applied.
open access

High-Temperature Superconductivity in Perspective

Description: This is the second of two OTA assessments on the subject of high-temperature superconductivity (HTS). As the title suggests, this study attempts to put HTS in perspective, both in terms of competing technologies (e.g., the more mature low-temperature superconductors), and in terms of the many technical and economic problems that must be overcome before HTS can be widely used.
Date: April 1990
Creator: United States. Congress. Office of Technology Assessment.
Partner: UNT Libraries Government Documents Department
open access

Commercializing high-temperature superconductivity

Description: Since the discovery of high-temperature superconductivity (HTS), research laboratories around the world have pushed the temperature limits steadily upward, opening the way to commercial applications with potentially revolutionary impacts. The scientific race is becoming a commercial race, one featuring U.S. and Japanese companies, and one that the United States could lose. Indeed, American firms may already be falling behind in commercializing the technology of superconductivity.
Date: June 1988
Creator: United States. Congress. Office of Technology Assessment.
Partner: UNT Libraries Government Documents Department
open access

Perspectives on Temperature in the Pacific Northwest's Fresh Waters

Description: This report provides a perspective on environmental water temperatures in the Pacific Northwest as they relate to the establishment of water temperature standards by the state and their review by the US Environmental Protection Agency. It is a companion to other detailed reviews of the literature on thermal effects on organisms important to the region. Many factors, both natural and anthropogenic, affect water temperatures in the region. Different environmental zones have characteristic tempera… more
Date: June 1, 1999
Creator: Coutant, C.C.
Partner: UNT Libraries Government Documents Department
open access

Thermal Effects in Intense Laser-Plasma Interactions

Description: We present an overview of a new warm fluid model that incorporates leading-order kinetic corrections to the cold fluid model without making any near-equilibrium assumptions. In the quasi-static limit we obtain analytical expressions for the momentum spread and show excellent agreement with solutions of the full time-dependant equations. It is shown that over a large range of initial plasma temperatures, the fields are relatively insensitive to the pressure force. We discuss implications of this… more
Date: October 22, 2004
Creator: Shadwick, B. A.; Tarkenton, G. M. & Esarey, E. H.
Partner: UNT Libraries Government Documents Department
open access

A Search for Periodic and Quasi-Periodic Patterns in Select Proxy Data with a Goal to Understanding Temperature Variation

Description: In this work over 200 temperature proxy data sets have been analyzed to determine if periodic and or quasi-periodic patterns exist in the data sets. References to the journal articles where data are recorded are provided. Chapter 1 serves an introduction to the problem of temperature determination in providing information on how various proxy data sources are derived. Examples are given of the techniques followed in producing proxy data that predict temperature for each method used. In chapte… more
Date: May 2016
Creator: Otto, James (James Robert)
Partner: UNT Libraries
open access

Variable-temperature sample system for ion implantation at -192 to +500/sup 0/C

Description: A variable-temperature sample system based on exchange-gas coupling was developed for ion-implantation use. The sample temperature can be controlled from -192/sup 0/C to +500/sup 0/C with rapid cooling. The system also has provisions for focusing and alignment of the ion beam, electron suppression, temperature monitoring, sample current measuring, and cryo-shielding. Design considerations and operating characteristics are discussed. 5 figures.
Date: April 1, 1978
Creator: Fuller, C. T.
Partner: UNT Libraries Government Documents Department
open access

Temperature dependence of phonons in pyrolitic graphite

Description: Dispersion curves for longitudinal and transverse phonons propagating along and near the c-axis in pyrolitic graphite at temperatures between 4/sup 0/K and 1500/sup 0/C have been measured by neutron spectroscopy. The observed frequencies decrease markedly with increasing temperature (except for the transverse optical ''rippling'' modes in the hexagonal planes). The neutron groups show interesting asymmetrical broadening ascribed to interference between one phonon and many phonon processes.
Date: January 1, 1977
Creator: Brockhouse, B.N. & Shirane, G.
Partner: UNT Libraries Government Documents Department
open access

Real-Time Temperature Measurement in a Vacuum Degasser Using Optical Pyrometry

Description: The objective of the research was the development of a fiber-coupled, optical pyrometer for continuous temperature measurement in a vacuum degasser that reduces process time, enhances process control, and eliminates manual or robot-operated thermocouples. Through the live testing performed at US Steel's Edgar Thompson Works, the challenges associated with making optical temperature measurements in a vacuum chamber were identified. As a result of these challenges it was determined that continuou… more
Date: February 14, 2007
Creator: Metrix, Michel Bonin - Process; Metrix, Peter Hues - Process; Metals, William Federoff - US Steel Nichloas Rymarchyk - Berry & Metals, Todd Smith - Berry
Partner: UNT Libraries Government Documents Department
open access

Artificial Cooling of the Columbia River By Dam Regulation Part 1

Description: In early July, 1958, it appeared that Columbia River temperature at HAPO would be near 24.5ºC by the end of August. River temperature were averaging 4º to 5º above 1957 figures and were 3º to 4º above the ten year highs. It seemed desirable to examine the problem to determine if any corrective measure could be taken, since it was apparent that production losses were imminent.
Date: May 25, 1959
Creator: Kramer, H. A.
Partner: UNT Libraries Government Documents Department
open access

Dislocations and mechanical properties of single crystal niobium disilicide

Description: The mechanical properties of single crystal NbSi{sub 2} have been investigated along [0001] and 45{degree} from [0001] toward [11{bar 2}0] using a Nikon QM-2 hot hardness tester from room temperature to 900 C in vacuum. The hardness along [0001] increases from room temperature to 300 C followed by a sharp decrease in hardness with temperature which is accompanied by a large uplift observed surrounding the indentations. Dislocations surrounding the indentations at room temperature and 300 C were… more
Date: September 1, 1996
Creator: Maloy, S. A.; Chu, F.; Petrovic, J. J. & Mitchell, T. E.
Partner: UNT Libraries Government Documents Department
open access

Infrared Imaging of Temperature Distribution in a High Temperature X-Ray Diffraction Furnace

Description: High Temperature X-ray Diffraction (HTXRD) is a very powerful tool for studies of reaction kinetics, phase transformations, and lattice thermal expansion of advanced materials. Accurate temperature measurement is a critical part of the technique. Traditionally, thermocouples, thermistors, and optical pyrometers have been used for temperature control and measurement and temperature could only be measured at a single point. Infrared imaging was utilized in this study to characterize the thermal g… more
Date: April 5, 1999
Creator: Payzant, E. A. & Wang, H.
Partner: UNT Libraries Government Documents Department
open access

Transport From Overlapping Electron and Ion Driftwave Instabilities

Description: The electron temperature gradient (ETG) mode is a likely contributor to electron thermal transport in tokamaks. The ETG modes are dominantly unstable for poloidal wavelengths shorter than the ion gyroradius (high-k) where the ion response is adiabatic. Thus, they do not directly produce ion thermal or momentum transport or particle transport. Two potential mechanisms whereby ETG modes could produce transport in these channels are explored in this paper: a nonlinear coupling between high-k ETG m… more
Date: July 2, 2004
Creator: Staebler, G. M.; Kinsey, J. E. & Waltz, R. E.
Partner: UNT Libraries Government Documents Department
open access

Observations on Ocean Temperatures in the Vicinity of Icebergs and in Other Parts of the Ocean

Description: Report issued by the Bureau of Standards over studies on ocean temperatures. Temperatures in the vicinity of icebergs are measured and compared with temperatures taken from other areas of the ocean. This report includes photographs, and illustrations.
Date: 1914
Creator: Waidner, C. W.; Dickinson, H. C. & Crowe, J. J.
Partner: UNT Libraries Government Documents Department
open access

Thermographic properties of eight blue-emitting phosphors

Description: We examined the effect of temperature on the light absorption and emission properties of eight phosphorescent compounds. These phosphors are commercially produced powders that emit mainly in the blue region when illuminated with ultraviolet light in the range 220 to 400 mn. Excitation and emission spectra measured over the range 20 to 350{degrees}C are examined for these phosphors. Data from the emission spectra indicate that there is a significant temperature dependence in this temperature ran… more
Date: May 1, 1993
Creator: Cunningham, D. M.; Allison, S. W. & Smith, D. B.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen