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。
The ATP-dependent proteolytic activity, protease La, *om Escherichia coli has been partially purified, and the role of ATP investigated.ATP (3 m) stimulated degradation of [methyL3HJcasein and [methyl-'*C]apohemoglobin 8-40-fold but only when M&' was present.The nucleotide had to be continuously present for this proce…
The dependence of the hard magnetic properties of melt-spun Nd1−xFex (0.5⩽x⩽0.7) and Pr1−xFex (0.4⩽x⩽0.7) alloys on quench rate is reported; the latter was controlled by varying the substrate surface velocity (vs ) of the melt-spinner. All of the alloys show an appreciable maximum in coercivity (Hci ) as a function of…
Abstract The glass and melting transitions of poly(ethylene terephthalate‐co‐ p ‐oxybenzoate)s have been studied by differential scanning calorimetry. Despite the higher glass transition expected for polyoxybenzoate, there is almost no change in the glass transition temperature up to 63 mol % oxybenzoate (353 ± 4 K).…
For simple halides, oxides, and chalcides, the measure of crystal cohesion represented by the product of the melting point and the square of the bond length scales with the coordination number of the cation as well as with the ease of reversible transfer of electrons between neighboring atoms. Effects due to changes i…
Abstract The anharmonicity of the infrared active lattice modes of sodium nitrite is studied from measurements of the infrared reflectivity from 60 to 400 cm −1 , in the temperature range 80 to 460 K. The infrared reflectivity spectra are analysed with the four‐parameter dispersion model based on the factorized form o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubilities of some electrolytes in water-pyridine and water-acetonitrile solvent mixturesJean Louis BrissetCite this: J. Chem. Eng. Data 1982, 27, 2, 153–155Publication Date (Print):April 1, 1982Publication History Published online1 May 2002Published inissue 1 April 1982ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of triplet states of a porphyrin measured by delayed fluorescenceJ. Feitelson and D. MauzerallCite this: J. Phys. Chem. 1982, 86, 9, 1623–1628Publication Date (Print):April 1, 1982Publication History Published online1 May 2002Published inissue 1 April 1982https://p…
In clean SF6 gas-insulated power transmission systems significant pre-breakdown discharges are rarely observed. This is so because the prevailing electric field is only moderately non-uniform. In practical systems, however, conducting particle contamination creates regions of highly non-uniform fields. Initial ionizat…
Boron carbide pellets, used as the neutron absorber materials in fast breeder reactors, were observed to crack in two distinctly different ways. Radial thermal gradients are produced as a result of internal heat generation. In larger‐diameter pellets, these thermal expansion gradients are large and it was observed tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of sulfur in asphalts by selective oxidation and photoelectron spectroscopy for chemical analysisJean Michel. Ruiz, Brian M. Carden, Louis J. Lena, Emile Jean. Vincent, and Jean Claude. EscalierCite this: Anal. Chem. 1982, 54, 4, 688–691Publication Date (Print)…
An important characteristic of a grain boundary is the depth to which its displacement field penetrates into the neighbouring single crystals. This boundary thickness, which is called the ‘structural width’ in this paper, may be studied by the use of an electron diffraction technique which is sensitive to the width of…
Abstract Die Phasenverhältnisse im System Cer‐Wasserstoff wurden neu untersucht. Im Gegensatz zu den bisherigen Literaturangaben konnte bei den kubischen Hydriden eine Abnahme der Gitterparameter mit steigendem Wasserstoffgehalt nur bis zu einer Zusammensetzung von CeH 2,30 beobachtet werden, bei noch größeren Wassers…
Abstract Degradation of polyethylene in both linear (NBS 1475) and branched (NBS 1476) form has been studied in the range 410–475°C using factor‐jump thermogravimetry. In vacuum, the rate of weight loss was erratic because of bubbling in the sample. The apparent overall activation energy was determined to be 65.4 ± 0.…
To increase the power throughput to a plasma of an existing lower hybrid waveguide, secondary electron production on the walls and subsequent electron multiplication must be reduced. Since carbon has a low secondary electron coefficient (δ), measurements were performed for several UHV compatible carbon coatings (Aquad…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb initio study of valence-state potential energy curves of nitrogenW. C. Ermler, A. D. McLean, and R. S. MullikenCite this: J. Phys. Chem. 1982, 86, 8, 1305–1314Publication Date (Print):April 1, 1982Publication History Published online1 May 2002Published inissue 1 April 198…
Using a pulse counting technique, inceptions of positive and negative point-plane corona in SF6 under dc and 60-Hz ac conditions were measured. Effects of gas pressure, UV-radiation, and point electrode size on differences between ac and dc, and between positive and negative inceptions were investigated. Inceptions we…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of several novel iron nitrosyl porphyrinsL. W. Olson, D. Schaeper, D. Lancon, and K. M. KadishCite this: J. Am. Chem. Soc. 1982, 104, 7, 2042–2044Publication Date (Print):April 1, 1982Publication History Published online1 May 2002Published inissue 1 April 19…
Superconductivity of the alkali-metal amalgam graphite intercalation compounds of stage 1 (${\mathrm{C}}_{4}$KHg, ${\mathrm{C}}_{4}$RbHg) and stage 2 (${\mathrm{C}}_{8}$KHg, ${\mathrm{C}}_{8}$RbHg) has been studied as well as that of the pristine amalgams (KHg, RbHg). The transition temperatures are 0.73, 0.99, 1.90,…
A survey is presented of the experimental work which has been carried out on the abrasive wear of metals. The effect of variables such as surface hardness, abrasive hardness, abrasive particle size, and velocity are discussed for several types of abrasive wear. The similarities between different types of wear are desc…
Abstract Owing to their particular crystallographic properties, ferrimagnetic hexagonal ferrites exhibit a far greater coercive force than the conventional magnetic pigments. They therefore appear to be suitable for use in magnetic information storage procedures, some of which are novel and are at the development stag…