13 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Quenching"  
Results: 1 - 13
open access

Role of structure in ion movement of glasses

Description: Can the structure of a melt much above the glass transition temperature (Tg) determine the structure and (transport) properties of glass In other words, are there extremely long lasting configurations in a melt which would affect ion transport in the glassy state A major effort during the past year has been to address these very fundamental questions. An important consideration here is to separate the effect of the variable melt structure from that of a variable cooling rate in the glass transf… more
Date: January 15, 1992
Creator: Jain, Himanshu
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

First observations of beam losses due to bound-free pairproduction in a heavy-ion collider

Description: We report the first observations of beam losses due tobound-free pair production at the interaction point of a heavy-ioncollider. This process is expected to be a major luminosity limit for theLarge Hadron Collider (LHC) when it operates with 208Pb82+ ions becausethe localized energy deposition by the lost ions may quenchsuperconducting magnet coils. Measurements were performed at theRelativistic Heavy Ion Collider (RHIC) during operation with 100GeV/nucleon 63Cu29+ ions. At RHIC, the rate, ene… more
Date: June 15, 2007
Creator: Bruce, R.; Jowett, J.M.; Gilardoni, S.; Drees, A.; Fischer, W.; Tepikian, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Electron Transfer Reactions of Excited Dyes With Metal Complexes. Progress Report, March 1, 1978-February 28, 1979. [Iron-Methylene Blue]

Description: An intense absorption band of /sup 3/MBH/sup 2 +/ at 700nm was characterized in several media and its pK/sub A/ was measured to be 7.17 +- .1 in water. Flash photolysis show that semiethylene blue, MBH/sup +/, formed by quenching /sup 3/MBH/sup 2 +/ with Fe/sub II/(H/sub 2/O)/sub 6//sup 2 +/, decays by disproportionation at a diffusion-controlled rate. Rates of decay of the photostationary state of solutions of MB/sup +/ and Fe/sup II/(H/sub 2/O)/sub 6//sup 2 +/ in acidic media were measured us… more
Date: March 15, 1979
Creator: Lichtin, N. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cryotribology: Development of cryotribological theories and application to cryogenic devices

Description: High-performance superconducting solenoids are susceptible to premature quenches, or superconducting to normal state transitions, due to abrupt conductor movements within the winding. Abrupt motions involving 5{approximately}10{mu}m conductor displacements dissipate sufficient energy to trigger a quench. Sliding and mechanical behaviors of materials at cryogenic temperatures have been experimentally examined. After accounting for changes in the sliding materials' low-temperature strength proper… more
Date: September 15, 1992
Creator: Iwasa, Y.; Michael, P. (Massachusetts Inst. of Tech., Cambridge, MA (United States)) & Rabinowicz, E. (Massachusetts Inst. of Tech., Cambridge, MA (United States) Massachusetts Inst. of Tech., Cambridge, MA (United States). Francis Bitter National Magnet Lab.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Role of structure in ion movement of glasses. Progress report, January 14, 1991--January 15, 1992

Description: Can the structure of a melt much above the glass transition temperature (Tg) determine the structure and (transport) properties of glass? In other words, are there extremely long lasting configurations in a melt which would affect ion transport in the glassy state? A major effort during the past year has been to address these very fundamental questions. An important consideration here is to separate the effect of the variable melt structure from that of a variable cooling rate in the glass tran… more
Date: January 15, 1992
Creator: Jain, Himanshu
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Role of Quench-back in the Passive Quench Protection of Uncoupled Solenoids in Series with and without Coil Sub-division

Description: This paper is the final paper in a series of papers that discusses passive quench protection for high inductance solenoid magnets. This report describes how passive quench protection system may be applied to superconducting magnets that are connected in series but not inductively coupled. Previous papers have discussed the role of magnet sub-division and quench back from a conductive mandrel in reducing the hot-spot temperature and the peak coil voltages to ground. When magnets are connected in… more
Date: October 15, 2010
Creator: Guo, Xing Long; Green, Michael A; Wang, Li; Wu, Hong & Pan, Heng
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Studies of the structure and function of Mms6, a bacterial protein that promotes the formation of magnetic nanoparticles

Description: Here we report structural and functional studies of Mms6, a biomineralization protein that can promote the formation in vitro of magnetic nanoparticles with sizes and morphologies similar to the magnetites synthesized by magnetotactic bacteria. We found the binding pattern of Mms6 to ferric ion to be two-phase and multivalent. We quantatively determined that Mms6 binds one Fe{sup 3+} with a very high affinity (K{sub d} = 10{sup -16} M). The second phase of iron binding is multivalent and cooper… more
Date: May 15, 2011
Creator: Wang, Lijun
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Development of Efficient UV-LED Phosphor Coatings for Energy Saving Solid State Lighting

Description: The University of Georgia, in collaboration with GE Global Research, has investigated the relevant quenching mechanism of phosphor coatings used in white light devices based on UV LEDs. The final goal of the project was the design and fabrication of a high-efficacy white light UV-LED device through improved geometry and optimized phosphor coatings. At the end of the research period, which was extended to seamlessly carry over the research to a follow-up program, we have demonstrated a two-fold … more
Date: May 15, 2006
Creator: Happek, Uwe
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cryotribology: Development of cryotribological theories and application to cryogenic devices. Interim report, June 15, 1985--August 31, 1992

Description: High-performance superconducting solenoids are susceptible to premature quenches, or superconducting to normal state transitions, due to abrupt conductor movements within the winding. Abrupt motions involving 5{approximately}10{mu}m conductor displacements dissipate sufficient energy to trigger a quench. Sliding and mechanical behaviors of materials at cryogenic temperatures have been experimentally examined. After accounting for changes in the sliding materials` low-temperature strength proper… more
Date: September 15, 1992
Creator: Iwasa, Y.; Michael, P. & Rabinowicz, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

THERMAL EXPANSION OF URANIUM DIOXIDE. Final Report

Description: The thermal expansions of commercial uranium dioxide specimens were measured up to the melting point. The linear expansion of dense, normal grain size UO/sub 2/ follows closely the equationi L = L/sub 0/(1 + 6.0 x 10/sup -6/t + 2.0 x 10/sup -9/t/sup 1.7 x 10/sup -12/t/sup 3/). An anomalous expansion was noted in the temperature range 1000 to 1500 deg C. Above 2500 deg C the rapid vaporization and crystal growth of UO/sub 2/ necessitate the application of heating techniques which provide rapid h… more
Date: April 15, 1959
Creator: Halden, F.A.; Wohlers, H.C. & Reinhart, R.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Metallurgy of Zircaloy-2. Part I. The Effects of Fabrication Variables on the Anisotropy of Mechanical Properties

Description: The anisotropy of mechanical propertles of Zircaloy-2 was studied as a function of fabricatlon variables. The variatlon in tensile and impact properties with specimen orientation was taken as the measure of the anisotropy of mechanical properties for each material. A qualitative separatlon of the effects of the fabrication variables on the resulting anisotropy of mechanical properties is made, but it is valid only in the rolling plane of the plate. A contractile strain ratio, a ratio of the nat… more
Date: November 15, 1960
Creator: Rittenhouse, P.L. & Picklesimer, M.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Heat Treatment Procedure Qualification -- Final Technical Report

Description: Heat treatment practices used by steel foundries have been carefully studied as part of comprehensive heat treatment procedure development trials. These studies highlight the relationships between critical heat treatment process control parameters and heat treatment success. Foundry heat treatment trials to develop heat treatment procedure qualification have shed light on the relationship between heat treatment theory and current practices. Furnace load time-temperature profiles in steel foundr… more
Date: October 15, 2004
Creator: Voigt, Robert C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen