Filters
Results 1 - 10 of 473
Results 1 - 10 of 473.
Search took: 0.025 seconds
Sort by: date | relevance |
Zhao, J.; Seehra, M.S.
AMSAHTS 1990: Advances in Materials Science and Applications of High Temperature Superconductors1991
AMSAHTS 1990: Advances in Materials Science and Applications of High Temperature Superconductors1991
AbstractAbstract
[en] The recently observed variations of the transition temperature (T sub c) with oxygen content in the Bi based (2212) and (2223) superconductors are analyzed in terms of p+, the hole concentration per CuO2 sheet. This analysis shows that in this system, T sub c increases with p+ initially, reaching maxima at p+ = 0.2 approx. 0.3, followed by monotonic decrease of T sub c with p+. The forms of these variations are similar to those observed in the La(2-x)Sr(x)CuO4 and YBa2Cu3Oy systems, suggesting that p+ may be an important variable governing superconductivity in the cuprate superconductors
Primary Subject
Source
Bennett, L.H.; Flom, Yury; Moorjani, Kishin.; West Virginia Univ., Morgantown, WV (United States); 488 p; Jan 1991; p. 55-59; AMSAHT'S 90: advances in material science and applications of high temperature superconductors; Greenbelt, MD (United States); 2-6 Apr 1990; NASA-CP--3100; REPT--90B00018; NAS--1.55:3100; CONF-900414--; NTIS HC/MF A21; INIS
Record Type
Report
Literature Type
Conference
Report Number
Country of publication
ALKALINE EARTH METAL COMPOUNDS, BISMUTH COMPOUNDS, CHALCOGENIDES, COPPER COMPOUNDS, ELECTRIC CONDUCTIVITY, ELECTRICAL PROPERTIES, ELEMENTS, LANTHANUM COMPOUNDS, NONMETALS, OXIDES, OXYGEN COMPOUNDS, PHYSICAL PROPERTIES, RARE EARTH COMPOUNDS, STRONTIUM COMPOUNDS, SUPERCONDUCTORS, THERMODYNAMIC PROPERTIES, TRANSITION ELEMENT COMPOUNDS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Ternary lead-free solder alloys Sn-Ag-Cu were considered as the potential alternatives to lead-tin alloys comparing with other solders. In this paper, microstructure and mechanical properties of Sn-2.5Ag-0.7Cu, Sn-3.5Ag-0.7Cu, Sn-3.5Ag-0.7Cu-0.1RE, and Sn-3.5Ag-0.7Cu-0.25RE alloys were researched. Coarse β-Sn grains were formed in Sn-2.5Ag-0.7Cu and Sn-3.5Ag-0.7Cu alloys and bulky Ag3Sn intermetallics were found in Sn-3.5Ag-0.7Cu alloy. With the addition of trace rare earth (RE) elements the coarse β-Sn grains were refrained, at the same time, Cu6Sn5 and Ag3Sn intermetallics were finer according to the adsorption affection of the active rare earth elements. Due to the fine and uniform microstructure, the tensile strength and elongation were improved. In addition, the wetting properties were also enhanced. All these results indicated that adding trace rare earth elements was an efficient way to develop new solders
Primary Subject
Source
S0925838804000477; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
No abstract available
Primary Subject
Source
AC02-98CH10886; Available from Brookhaven National Lab., Upton, NY (US)
Record Type
Journal Article
Journal
Acta Crystallographica. Section A: Foundations of Crystallography; ISSN 0108-7673;
; CODEN ACACEQ; v. 57(1); [10 p.]

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] Short communications only
Secondary Subject
Source
Academia Sinica, Beijing, BJ (China). Inst. of Atomic Energy; Academia Sinica, Beijing, BJ (China). Inst. of Physics; 121 p; 1993; p. O5; Neutron scattering satellite meeting in association with 16th IUCr congress; Beidaihe (China); 17-19 Aug 1993; Available from China Nuclear Information Centre
Record Type
Miscellaneous
Literature Type
Conference
Country of publication
Reference NumberReference Number
Related RecordRelated Record
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A high-efficiency diffusion-multiple approach was employed to determine the phase diagram of the Nb-Cr-Si ternary system which is critical for the design of niobium silicide-based in situ composites. These composites have high potential as a replacement for Ni-base superalloys for jet engine applications. The formation of the Nb(Cr,Si)2 Laves phase is beneficial to the high oxidation resistance of the composites and the Nb-Cr-Si system serves as the base for understanding the Laves phase formation. The results clearly demonstrate the applicability of the diffusion-multiple approach in determining such complex phase diagrams as Nb-Cr-Si which contains 14 phases. Two isothermal sections at 1000 and 1150 deg. C were constructed from the results obtained from diffusion multiples using scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and electron backscatter diffraction (EBSD). Three ternary compounds, CrNbSi, (Cr,Nb)6Si5 and (Cr,Nb)11Si8, were observed at both temperatures, and the C14 Laves phase of the Cr-Nb binary system was stabilized by Si to lower temperatures
Primary Subject
Source
S1359645403004762; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
ALLOYS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CARBON ISOTOPES, CHEMICAL ANALYSIS, CHEMICAL REACTIONS, COHERENT SCATTERING, DIAGRAMS, DIFFRACTION, ELECTRON MICROSCOPY, ELEMENTARY PARTICLES, ELEMENTS, EVEN-EVEN NUCLEI, FERMIONS, HEAT RESISTANT MATERIALS, INFORMATION, ISOTOPES, LEPTONS, LIGHT NUCLEI, MATERIALS, METALS, MICROANALYSIS, MICROSCOPY, NONDESTRUCTIVE ANALYSIS, NUCLEI, RADIOISOTOPES, REFRACTORY METALS, SCATTERING, SILICON COMPOUNDS, TRANSITION ELEMENTS, YEARS LIVING RADIOISOTOPES
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A high-efficiency diffusion-multiple approach was employed to map the phase diagram of the Nb-Ti-Si ternary system, which is critical for the design of niobium silicide-based composites. These composites have high potential as a replacement for Ni-base superalloys for jet engine applications. Titanium is one of the most important elements for oxidation resistance and fracture toughness enhancement. Three isothermal sections of Nb-Ti-Si at 1000, 1150 and 1200 deg. C were constructed from the results obtained from diffusion multiples using scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and electron backscatter diffraction (EBSD). Extremely high solubility of Nb in Ti5Si4 (up to ∼46 at.% Nb at 1200 deg. C, substituting for Ti) was observed
Primary Subject
Source
S0921509303006804; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing; ISSN 0921-5093;
; CODEN MSAPE3; v. 372(1-2); p. 21-27

Country of publication
ALLOYS, CHEMICAL ANALYSIS, COHERENT SCATTERING, DIAGRAMS, DIFFRACTION, ELECTRON MICROSCOPY, ELEMENTS, HEAT RESISTANT MATERIALS, INFORMATION, MATERIALS, MECHANICAL PROPERTIES, METALS, MICROANALYSIS, MICROSCOPY, NONDESTRUCTIVE ANALYSIS, REFRACTORY METALS, SCATTERING, SILICON COMPOUNDS, TRANSITION ELEMENTS
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A high-efficiency diffusion-multiple approach was employed to map the phase diagram of the Nb-Al-Si ternary system which is very valuable for the design of niobium silicide-based composites. These composites have high potential as a replacement for Ni-base superalloys for jet engine applications. Aluminum is an alloying element for these composites, thus the Nb-Al-Si phase diagram, especially solubility of Al in Nb5Si3, is important information for the composite design. An isothermal section at 1000 deg. C was constructed from the results obtained from a diffusion multiple using scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). A ternary phase Nb3Si5Al2 was observed. The solubility data of Al in αNb5Si3 and NbSi2 as well as Si solubility in Nb3Al, Nb2Al and NbAl3 were obtained. The new isothermal section helps to judge the reliability of the existing literature results and to add new data to the Nb-Al-Si phase equilibria
Primary Subject
Source
S0925838803005243; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
External URLExternal URL
Ross, N.L.; Zhao, J.; Angel, R.J., E-mail: nross@vt.edu2004
AbstractAbstract
[en] The equation of state and structural changes of YAlO3 perovskite, a GdFeO3-type perovskite with Pbnm symmetry, have been investigated to 8.5 GPa in a diamond-anvil cell at room temperature using single-crystal X-ray diffraction. A fit of a third-order Birch-Murnaghan equation of state to the P-V data yields values of KT0=192(2) GPa and K'0=7.3(4), with compressional moduli of the axes, Ka0=220(7) GPa, Kb0=157(3) GPa and Kc0=212(2) GPa, and their pressure derivatives, K'a0=12(2), K'b0=4.4(6)(6) and K'c0=8.7(4). The evolution of the structure with pressure shows that compression of the YO12 site is strongly anisotropic with the four longest Y-O separations more compressible than the eight shorter Y-O bond lengths. Consequently the distortion of the YO12 site decreases with increasing pressure. In contrast, the AlO6 site undergoes nearly isotropic compression and is more compressible than the YO12 site. The interoctahedral angles, angle Al-O1-Al and angle Al-O2-Al, show a significant increase with pressure, reflected in the movement of O1 along <100>. The structure of YAlO3 perovskite therefore becomes less distorted with increasing pressure, in contrast with other Pbnm perovskites such as CaSnO3
Primary Subject
Source
S0022459603006182; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] The phenotypic plasticity of Sagittaria graminea to nitrogen and phosphate including morphology, growth and biomass allocation, and the impact of the biological invasion on biodiversity and grassland agroecosystem were investigated. The nitrogen was from NH4NO3 and the concentration was 0g (control), 0.4g/kg (LN),0.6g/kg (MN) and 0.8g/kg (HN) air-dried soil; the phosphate was from NaH2PO4 and the concentration was 0g (control), 0.2g/kg (LP), 0.4g/kg (MP) and 0.6g/kg (HP) air-dried soil. According to the characteristics of the flowering, seedling and clonal reproduction of the Sagittaria graminea, it was harvested in the blooming period, and the height of each plant, the number of leaves, and the female and male flowers were counted. The results showed that Sagittaria graminea had plasticity and adaptability to different nutriention. With the increase of nitrogen, the root biomass was decreased and total biomass, leaf biomass, flower biomass, relative growth rate, net assimilation rate, leaf number and plant height was increased; with the increase of phosphate, total biomass and leaf biomass increased and plant height, petiole biomass, root biomass, root/shoot, relative growth rate and net assimilation rate were not changed. (author)
Primary Subject
Record Type
Journal Article
Journal
Pakistan Journal of Botany; ISSN 0556-3321;
; v. 50(2); p. 505-509

Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Zhao, J.; Ohi, T.; Sakai, J.I.; Neubert, T.
Proceedings of the 1996 international conference on plasma physics1997
Proceedings of the 1996 international conference on plasma physics1997
AbstractAbstract
[en] If the distribution of pair plasmas is a bi-Maxwellian with Tperpendicular/Tparallel > 1 and if this anisotropy is sufficiently large, large-amplitude Alfven waves with arbitrary polarizations can arise. Simulation results show that an amplitude of the excited Alfven waves increases as the temperature anisotropy increases. Nonlinear evolution of the large-amplitude Alfven waves causes magnetic trapping, which could provide the saturation mechanism. After saturation, the initial bi-Maxwellian distribution of particles still remains and a residual temperature anisotropy persists long, at least on the time scale of simulations. (author)
Primary Subject
Source
Sugai, H. (Nagoya Univ. (Japan). Faculty of Engineering); Hayashi, T. (eds.); 2147 p; ISBN 4-9900586-1-5;
; ISBN 4-9900586-2-3;
; 1997; p. 146-149; Japan Society of Plasma Science and Nuclear Fusion Research; Nagoya (Japan); ICPP96: 1996 international conference on plasma physics; Nagoya (Japan); 9-13 Sep 1996


Record Type
Book
Literature Type
Conference
Country of publication
Reference NumberReference Number
Related RecordRelated Record
INIS VolumeINIS Volume
INIS IssueINIS Issue
1 | 2 | 3 | Next |