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 tensile strength of decamethylene dismethylazodicarboxylate vulcanizates of GR‐S, 50°C. polybutadiene, 5°C. polybutadiene, and natural rubber has been determined as a function of temperature and/or the degree of crosslinking. A theory of tensile strength of amorphous polymers which adequately describes th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPowder Diffraction Standards for Niobium Pentoxide and Tantalum PentoxideL. K. frevel and H. W. RinnCite this: Anal. Chem. 1955, 27, 8, 1329–1330Publication Date (Print):August 1, 1955Publication History Published online1 May 2002Published inissue 1 August 1955https://pubs.a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline Organosilsesquioxanes*Arthur J. Barry, William H. Daudt, Joseph J. Domicone, and John W. GilkeyCite this: J. Am. Chem. Soc. 1955, 77, 16, 4248–4252Publication Date (Print):August 1, 1955Publication History Published online1 May 2002Published inissue 1 August 1955…
The specific viscosity, and its dependence on velocity gradient, plays an important role in studies of the structure of macromolecules in dilute solution. A satisfactory theoretical interpretation of the non-Newtonian viscosity of solutions of ellipsoidal particles has been given by Kuhn and Kuhn, and also by Saito, w…
The problem of determining the time of relaxation due to scattering of electrons and holes by charged impurity donors and acceptors in semiconductors is reconsidered in an effort to derive formulae more exact and general than those due to Conwell, Weisskopf, and other authors.
A macroscopically homogeneous aggregate contains two materials A, B, with dielectric constants εA, εB, in volume ratio p: (1—p); what is the dielectric constant of the aggregate? By a method used by Yvon and others in molecular theory, this very old problem is formulated rigorously and solved in series form. One form…
The method, developed by Kuhn and Van Vleck, and later simplified and extended by Brooks, for calculating the cohesive energy of monovalent metals, is here further extended to include the effects of the deviation of the effective ion-core potential from pure hydrogenic form in the vicinity of the surface of the $s$-sp…
Experimental measurements on nuclear quadrupole resonances of chlorine and antimony isotopes in solids have been made to an accuracy of about 0.001 percent. The results are compared in detail with theoretical results for (1) nuclear quadrupole interaction, (2) interaction between quadrupole coupling and thermal vibrat…
Manganese bismuth loses its spontaneous magnetization very sharply at 633\ifmmode^\circ\else\textdegree\fi{}K. At the same temperature drastic changes occur in the lattice constants. Previous workers have interpreted both these phenomena as arising from a ferromagnetic-antiferromagnetic transition. The present work in…
A formula for the change in capacity due to the insertion of a yarn in a parallel-plate condenser, in fairly general circumstances, is given in this paper. The effects of various factors, such as yarn density, twist, dielectric constant, and geometrical configuration, are discussed at length.
Previous work has shown that the structural reversals of cotton fibers are points of weakness at which the fibers prefer to break. The present paper is concerned with the distribution of these reversals in the individual fibers and with differences in reversal frequencies for various cotton varieties. It is shown that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Structure of HCN TetramerRichard L. Webb, S. Frank, and W. C. SchneiderCite this: J. Am. Chem. Soc. 1955, 77, 13, 3491–3493Publication Date (Print):July 1, 1955Publication History Published online1 May 2002Published inissue 1 July 1955https://pubs.acs.org/doi/10.1021/ja0…
Experimental results are reported of the magnetic properties of telluride of cobalt, CoTe x , where x is the molal content of tellurium. Measurments of the magnetization have been made over a range of temperatures between liquid air and 1150°C. The results of these measurements show that this compound, when stoichiome…
The tungsten surface in a field emission microscope is exposed to oxygen gas at a pressure near 5×10—8 mm and the effect of the gas on the field emission is observed. During the first 30 seconds, the emission decreases rapidly, but some regions deactivate more rapidly than others. During the next 12 minutes, the rate…
Infrared studies of HN3 and DN3 in the gas and solid phases and of HN3 in CCl4 solutions are presented. The two low-frequency skeletal bending modes are identified, permitting calculation of the thermodynamic properties of hydrazoic acid. Hydrogen bonding of HN3 and DN3 in the solid state is indicated by frequency shi…
Abstract A study was made of a Red‐Yellow Podzolic soil with particular regard to the properties of dioctahedral vermiculite, one of its major clay minerals. The soil, Nason silt loam, which is derived from a muscovite schist residuum, was found to be nearly devoid of exchangeable calcium and low in other bases. Altho…
A theoretical study has been made of the focusing of high-current electron beams by means of the aperture effect. The aperture effect is obtained by a triode electron optical system. An equation for describing the beam profile in the system has been described. Both the condition for obtaining the minimum radius of the…
Abstract It has been recognized for many years that many aspects of clay technology including soil treatment and drilling mud treatment must remain in an essentially empirical state until a basis for the understanding of ion exchange reactions is established. Much of the work on ion exchange reactions of clays in the…
Abstract Differential thermal analysis (DTA) began soon after the development of the thermocouple. It has progressed through the systematic development of better equipment and the cataloguing of typical DTA curves for a variety of materials until good technique now requires control of the composition and pressure of t…
A smooth, flat, rigid punch under increasing normal load presses against a half space of a perfectly plastic material which obeys Tresca’s yield criterion. An admissible velocity field is constructed for an arbitrary smooth punch hence, for any particular case, a limit design theorem of Drucker, Prager and Greenberg m…