Physical parameters and pulsational mode of short-period small-amplitude Cepheids
Etude de neuf Cepheides de faible amplitude et de courte periode (<8 jours) afin de determiner leurs parametres physiques et proprietes pulsationnelles
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Magnetic Properties of CrSb
It is experimentally known that an antiferromagnetic compound CrSb ( T N ≧700 K) with a NiAs type crystal structure exhibits unusual magnetic properties, that is, sharp decrease of magnetic moment, steep increase of magnetic specific heat and of magnetic susceptibility just below T N with increasing temperature. These…
The crystal structure of bismuth sulfide bromide, BiSBr
Redetermination, par diffraction X sur monocristal, de la structure cristalline de BiSBr en utilisant des methodes plus modernes que celles effectuees par Donges (1950). Groupe d'espace Pnam avec a=8,1666, b=9,8532, c=4,0492 A, Z=4. Description de l'arrangement structural des atomes dans la maille. Formation d'un syst…
Conditions Contributing to Underground Copper Corrosion
Copper, a noble metal that occurs naturally in its elemental form, is almost totally impervious to corrosion from soils found worldwide. But it would be misleading to infer that copper will not corrode. This article identifies a host of possible situations in which copper pipe or tubing may be subject to external corr…
Tensile and Impact Properties of Candidate Alloys for High-Temperature Gas-Cooled Reactor Applications
The tensile properties of solution-treated Incoloy alloy 800H, Hastelloy-X, Nimonic-86, and Inconel-617 have been determined in the temperature range 20 to 1000°C. The strength parameters at temperatures above 700°C showed a strong dependence on the strain rate; at low strain rates the deformation was dominated by cre…
Neutron Scattering Studies on Phase Transition and Phonon Dispersion in Cs2NaBiCl6
Abstract The structural phase transition (PT) of elpasolite‐type crystal Cs 2 NaBiCl 6 is investigated by neutron scattering. At first the acoustic phonon dispersion is measured at room temperature for the highsymmetric directions Δ, ∑, and Λ of the Brillouin zone. The transverse rotary mode is studied for phonon wave…
Theoretical Model of Impact Damage in Structural Ceramics
This paper presents a mechanistically consistent model of impact damage based on elastic failures due to tensile and shear overloading. An elastic axisymmetric finite element model is used to determine the dynamic stresses generated by a single particle impact. Local failures in a finite element are assumed to occur w…
The Corrosion Behavior of High-Temperature Alloys During Exposure for Times up to 10 000 h in Prototype Nuclear Process Helium at 700 to 900°C
A corrosion program is being carried out to establish the long-term corrosion behavior of candidate alloys for the prototype nuclear process (PNP) reactor primary circuit. Results are presented for corrosion tests performed in impure helium over the temperature range of 700 to 900 °C for times up to 10000 h.In the hel…
Thermodynamics and kinetics of carbon dioxide chemisorption on calcium oxide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics and kinetics of carbon dioxide chemisorption on calcium oxideDario Beruto, Rodolfo Botter, and Alan W. SearcyCite this: J. Phys. Chem. 1984, 88, 18, 4052–4055Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published inissue…
On the Mechanism of Aluminum Corrosion in Metallized Film AC Capacitors
Metallized film capacitors consist of alternating layers of polypropylene or other polymeric film dielectric and vapor deposited aluminum conductor. During operation above 250 V ac (RMS), circular islands of oxide develop in the aluminum conducting layers and reduce the capacitance. Increasing the aluminum layer thick…
Application of X‐ray‐induced Auger electron spectroscopy to state analyses of hydrogen implanted in Y, Zr and Nb metals
Abstract X‐ray‐induced Auger electron spectroscopy (XAES) was used to examine the surface chemical states of hydrogen implanted metals. The chemical shifts of the M 4,5 N 2,3 V Auger peaks from their metallic states were 1.0 eV, 3.3 eV and 2.2 eV, respectively, for ion‐implanted Y, Zr and Nb. The separation energies w…
The heat capacities of osumilite from 298.15 to 1000 K, the thermodynamic properties of two natural chlorites to 500 K, and the thermodynamic properties of petalite to 1800 K
We report results obtained with our recently automated low-temperature, adiabatic calorimeter. A brief description of the changes in the instrument are provided. The heat capacities of natural osumilite (Kee3Naa.seCao.ozBaoelMgl s6Fee.3sTis.s1Ala.62 Siro rzOro) were measured from 340 to 1000 K by differential scanning…
Color centers and clustering in liquid alkali metal-alkali halide solutions approaching the nonmetal-metal transition: an optical study
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColor centers and clustering in liquid alkali metal-alkali halide solutions approaching the nonmetal-metal transition: an optical studyW. Freyland, K. Garbade, H. Heyer, and E. PfeifferCite this: J. Phys. Chem. 1984, 88, 17, 3745–3749Publication Date (Print):August 1, 1984Pu…
Solubility of Refractory Oxides in Soda‐Lime Glass
A method for measuring the solubility limit of refractory oxides in glass is presented, and the solubilities of Al 2 O 3 , ZrO 2 , SnO 2 , and Cr 2 O 3 in soda‐lime glass are given as a function of temperature. The order of solubility in soda‐lime glass is Al 2 O 3 ZrO 2 SnO 2 Cr 2 O 3 at 1300° to 16Q0°C. The solubili…
Low-temperature phases in Cs2CdBr4 and Cs2HgBr4
With respect to their phase transitions, Cs2CdBr4 and Cs2HgBr4 are the first known representatives of a new group having the flK2SO4-type structure. Upon coolmg they show the following phase sequence. Phase I: Pnma, Z -4. Cs, Cd /Hg and two Br are in special positions on the mirror plane. Second-order phase transition…
Polymer Fatigue
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
ISOMERISM OF THE HEXAMOLYBDO-PLATINATE(IV) POLYANION. CRYSTAL STRUCTURES OF K3.5[α-H4.5PtMo6O24]·3H2O AND (NH4)4[β-H4PtMo6O24]·1.5H2O
Abstract The hexamolybdo-platinate(IV) anion, [PtMo6O24]8− has been found to have two geometrical isomers, one having the Anderson structure and the other having the same framework with the heptamolybdate ion reported by Lindqvist.
Creep Rupture Behavior of Candidate Materials for Nuclear Process Heat Applications
Creep and stress rupture properties are determined for the candidate materials to be used in high-temperature gas-cooled reactor (HTGR) components. The materials and test methods are briefly described based on experimental results of test durations of ∼20 000 h. The medium creep strengths of the alloys lnconel-617, Ha…
Influences on carbon monoxide and dioxygen binding to iron(II) porphyrins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluences on carbon monoxide and dioxygen binding to iron(II) porphyrinsKenneth S. Suslick, Mary M. Fox, and Thomas R. ReinertCite this: J. Am. Chem. Soc. 1984, 106, 16, 4522–4525Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published…
A fully automated system to study skin surface patterns
Synopsis An image analysis method to measure the human skin microrelief has been previously proposed. This new method has been recently automated, using a 'robot'electronically driven by a Quantimet 900. This 'robot'consists of a change-over specimen driven by four motors, and allows forty Silflo(R) replicas to be ana…