Materials Literature
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。
Abstract The polymerization of β‐butyrolactone was investigated as a possible monomer for a proposed synthesis of the naturally occurring polyester, D ‐poly‐β‐hydroxybutyrate ( D ‐PHB). The racemic DL ‐monomer was used in this initial study to determine the best conditions and catalyst system for use in a subsequent s…
An electron microscope study has been made of the time-dependent annealing behaviour of interstitial loops in impure and pure molybdenum neutron-irradiated at 77°K (A77 and C77) respectively and of vacancy loops in pure molybdenum neutron-irradiated at 473°K (C473). The results have been quantitatively analysed and lo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRhodium(I) and iridium(I) complexes with 1,1,1-tris(diphenylphosphinomethyl)ethaneW. O. Siegl, S. J. Lapporte, and J. P. CollmanCite this: Inorg. Chem. 1971, 10, 10, 2158–2165Publication Date (Print):October 1, 1971Publication History Published online1 May 2002Published inis…
The craze-initiation criteria for craze-prone glassy polymers are examined with a model test method. In this method a prismatic sample of polystyrene with an embedded steel ball is subjected to a simple tension until crazing takes place around the interface. Stress analysis showed that various published craze-initiati…
Simple equations are given for determining both refractive index and film thickness from a measurement of interference fringe separation where the question of phase change and the order of the fringes can be disregarded. The equations are quite general, since they apply to fringe maxima or minima for either transmissi…
Hexagonal nickel sulphide shows a transition at 260 K from an antiferromagnetic to a paramagnetic state which is accompanied by an abrupt change in the conductivity. It is suggested that this is not a Néel temperature, that is a destruction of long-range order, but a first-order disappearance of the moments, and that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConfirmation of biprotonic phototautomerism in 7-azaindole hydrogen-bonded dimersKenneth C. Ingham, M. Abu-Elgheit, and M. Ashraf El-BayoumiCite this: J. Am. Chem. Soc. 1971, 93, 20, 5023–5025Publication Date (Print):October 1, 1971Publication History Published online1 May 2…
The properties of ferroelectric and ferroelastic crystals are examined in terms of atomic arrangement. Ferroelectric crystals are divided into three classes according to the predominant nature of the atomic displacements required by polarity reversal. The one-dimensional class involves atomic displacements parallel to…
A computer procedure for slit-height correction of X-ray small-angle scattering curves is described, which Ij based on direct calculation of the desmeared intensity values Ij from the equations Ĩi = ∑jai,jIj where Ĩi is the observed smeared intensity at point i and ai,jIj represents the contribution from a point j alo…
Abstract Colicin E1 was purified from mitomycin C-induced Escherichia coli JC411 (ColE1) by salt extraction of extracellular, bound colicin followed by ammonium sulfate fractionation and ion exchange chromatography. The purified preparation was considered homogeneous by several criteria. Gel filtration on Sephadex G-2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses and photochemistry of 1,2,3-trisilacycloheptane derivatives. Precursors for tailor-made organosilylenesHideki Sakurai, Yoshiteru Kobayashi, and Yasuhiro NakadairaCite this: J. Am. Chem. Soc. 1971, 93, 20, 5272–5274Publication Date (Print):October 1, 1971Publication…
The history of ferroelectricity is carried to the discovery of the ferrolectric properties of barium titanate in 1943. A few more recent events are noted briefly.
It is shown that because of the unique properties of the soft ferroelectric mode in perovskites of the BaTiO3-type, as well as in related displacive ferroelectrics, the Gruneisen parameter γf of this mode and its temperature dependence can be simply determined from measurements of the pressure and temperature dependen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuenching of the phosphorescence of some chromium(III) complexes by molecular oxygenAchim PfeilCite this: J. Am. Chem. Soc. 1971, 93, 21, 5395–5398Publication Date (Print):October 1, 1971Publication History Published online1 May 2002Published inissue 1 October 1971https://pu…
The problem of protecting spacecraft from high temperature encountered during a mission has resulted in the development of several types of thermal protection systems which are described here.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of tetraselenium bis(hydrogen disulfate)I. D. Brown, D. B. Crump, and R. J. GillespieCite this: Inorg. Chem. 1971, 10, 10, 2319–2323Publication Date (Print):October 1, 1971Publication History Published online1 May 2002Published inissue 1 October 1971https:/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of Infinite Dilution Activity Coefficients with Wilson's EquationL. B. Schreiber and C. A. EckertCite this: Ind. Eng. Chem. Process Des. Dev. 1971, 10, 4, 572–576Publication Date (Print):October 1, 1971Publication History Published online1 May 2002Published inissue 1 Oct…
Transmissivities were measured and absorption coefficients derived for three types of fused quartz between room temperature and 1500 degrees C: GE uv Type 151 (0.21-2.0 mu), GE ir Type 105 (0.21-3.5 mu), and Corning Vycor ir glass No. 7905 (1.7-4.0 mu). Less extensive measurements were also performed with Corning uv T…
The Electronic Structure of Some Palladium Alloys Studied by ESCA and X-ray Spectroscopy, J Hedman, M Klasson, R Nilsson, C Nordling, M F Sorokina, O I Kljushnikov, S A Nemnonov, V A Trapeznikov, V G Zyryanov
The calculated value of the effective atomic number (z tau ) of 7.23 for lithium tetraborate (Li 2 B 4 O 7 ) agrees closely with the value of 7.22 for soft tissue of composition C 5 H 40 O 18 N. For excised muscle specimens the experimental value (7.42) obtained by Spiers for z tau is very nearly equal to the correspo…