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。
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnion exchange and a selectivity scale for elements in sulfuric acid media with a strongly basic resinF. W. E. Strelow and C. J. C. BothmaCite this: Anal. Chem. 1967, 39, 6, 595–599Publication Date (Print):May 1, 1967Publication History Published online1 May 2002Published in…
Abstract A model nucleating agent for polypropylene crystallization is described. A series of compounds consisting mainly of organocarboxylic acid salts is evaluated as heterogeneous nucleating agent for polypropylene crystallization by measuring their effect upon the polymer supercooling. Sodium benzoate and basic al…
The key features of the complete, stable nickel—carbon phase diagram have been established at pressures up to 54 kbar, and these features have been directly related to the nucleation and growth characteristics of diamonds in this system. At pressures in excess of 52.5 kbar, a liquid+graphite+diamond eutectic is formed…
Abstract Aromatic polyimides were prepared from pyromellitic dianhydride and a number of aromatic diamines. The effect of certain variables on the polymerization to, and the degradation of, the intermediate polypyromellitamic acids was studied, and a previously unrecorded reaction intermediate was isolated and identif…
The bowing under stress of a segment of an otherwise straight dislocation line has been determined for an isotropic solid. A digital computer is used to relax the dislocation to its equilibrium shape, using a variant of the Brown self-stress method. The critical stress required to make the dislocation become unstable…
Optical fluorescence, thermally tunable over significant portion of visible and near IR SPECTRUM, from phase-matched parametric system
"Introduction to Nuclear Reactor Theory." Nuclear Science and Engineering, 28(2), pp. 313–314
A new crystalline form of carbon—hexagonal diamond—has been synthesized in the laboratory under conditions of static pressure exceeding about 130 kbar and temperature greater than about 1000°C. It is necessary to start with well-crystallized graphite in which the c axes of the crystallites are parallel to each other a…
Mössbauer absorption spectrography can be used to establish the presence of Fe(2)+ and Fe(3)+ in clay minerals. In the sheet structure silicates, octahedrally coordinated iron can be distinguished from tetrahedrally coordinated iron. Siderite and goethite, common contaminants of the clay minerals, can usually be detec…
Chemical treatments involving ion exchange cause gross onedimensional swelling in water of single crystals of vermiculite minerals. A delicate balance of forces holds the individual silicate layers (10 angstroms thick) parallel to one another although separated by several hundred angstroms. Colloidal dispersions produ…
Abstract Fleming discovered an enzyme which he called lysozyme; it had ‘the power of rapidly dissolving certain bacteria, which is possessed by many animal and vegetable tissues and secretions and to a very marked degree by egg-white' (Fleming 1922). Hen egg-white lysozyme was crystallized by Abraham & Robinson in…
Abstract The chemical evidence for the enzymic activity of lysozyme will be discussed in detail by other speakers at this meeting, but in order to describe our crystallographic studies of the interactions between the enzyme and its substrates it is necessary to summarize briefly what was known about them at the beginn…
The infrared transmission spectra of AgCl, AgBr, and AgI have been measured between 400–30 cm−1 at room temperature and at 143°K. Strong absorptions characteristic of the transverse optic modes were found, together with weak subsidiary absorptions arising from multiphonon combinations. The longitudinal optic modes of…
The kinetic study at different pH values indicates that the monoanion of oxalacetic acid is the major active species which decarboxylates spontaneously. The decarboxylation of the monoanion is favored by nonpolar solvents. Solvent and isotopic effects suggest that the reaction may proceed via an intramolecular hydroge…
A semiphenomenological theory for pure, insulating Bravais lattices is developed to clarify in a unified fashion the problems of sound propagation, sound damping, second sound, and heat conduction. The crystal is described as a gas of interacting quasiparticles coupled to an anisotropic elastic medium. The thermodynam…
A mathematical lattice model was used to compute the kinetic and static aspects of vacancy-cluster nucleation, growth, and dissociation in $\ensuremath{\alpha}$-iron. Persistent attention is paid to the kinetics of changes among metastable configurations as well as the formation of stable configurations. The tetravaca…
We report that the critical thickness for the appearance of stripe domains in evaporated permalloy films depends sensitively on vacuum pressure during evaporation and also that the perpendicular anisotropy constant can be obtained from the critical thickness rather precisely. It was found that the perpendicular anisot…
In order to test thermal-transport theories with data involving readily calculable phonon scattering rates, the thermal conductivity of LiF has been measured between 1 and 100\ifmmode^\circ\else\textdegree\fi{}K, first for a series of isotopically pure crystals with sandblasted surfaces ranging in mean width from 1 to…
In the Boltzmann-equation derivation, second sound is seen as the self-sustained propagation of a temperature wave, assuming the establishment of local equilibrium. Kwok and Martin have shown, by a study of the linear response to a fluctuating displacement field, that second sound occurs as an elementary excitation. I…
This paper discusses the statistical mechanics of ferromagnetic and antiferromagnetic systems in the presence of uniaxial anisotropy, which is included both as anisotropic exchange ${D}_{\mathrm{ij}}S_{i}^{}{}_{}{}^{z}S_{j}^{}{}_{}{}^{z}$ and in the form of single-ion crystal-field terms ${D}_{0}{(S_{i}^{}{}_{}{}^{z})…