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。
Hiroyuki Tadokoro, Yoshiyuki Nishiyama, Shun’ichi Nozakura, Shunsuke Murahashi; Stereoregular Polymers. VII. Infrared Spectra of Isotactic Polystyrene, Iso
New measurements of the decay of the luminescence produced in LiI(Eu), NaI(Tl), KI(Tl), CsBr(Tl) and three CsI crystals of varying thallium concentration have been made for particles with different ionization densities. The decay time of the luminescence is found to depend on the average ionization density ρ. In all c…
The rate of reaction (a) has been studied over the temperature range 1140–1460 °C, by following the loss in weight of the reactants in high vacuum.[Formula: see text]The loss in weight of the reactants was found to be greater than that which can be accounted for by the above reaction. The excess weight loss was found…
Hydrogen absorption during the corrosion of zirconium alloys has been studied in 600 and 680 F water and 750 F 1500-psi steam. Results on binary sponge-base alloy series indicate that, of the alloying elements found in Zircaloy-2, nickel at increasing levels markedly increases hydrogen absorption. Tin has little or no…
Abstract A number of polymethylene sulfide and polymethylene oxide polymers have been synthesized in order to study the influence of sulfur and oxygen atoms on melting temperature and rate of crystallization. Substituting oxygen for sulfur lowers the melting temperature but does not markedly change the rate of crystal…
Measurements were made of the magnetostriction and anisotropy in oriented polycrystals of MnBi at various temperatures between 77–300°K. The magnetostriction constants in a four-constant expression have been evaluated as a function of temperature, and the first three anisotropy constants also have been estimated. At l…
Studies of the temperature dependence of Bragg reflections and critical scatterings of X-rays have been carried out for the ferroelectric NaNO 2 in a manner analogous to those made by Shibuya and Mitsui for (glycine) 3 ·H 2 SO 4 . Experimental observations agree with theoretical predictions which are based on an assum…
Nickel chromite is a normal spinel whose structure has a tetragonal distortion below about 310°K. The structure parameters have been determined by neutron diffraction at 77°K, at which temperature the c/a ratio of a face-centered unit cell is 1.04. The space group is I41/amd with four Ni ions in positions 4(a), eight…
Iron-0.5% carbon was fatigued in air and in vacuum. The knee in the S-N curve at the fatigue limit occurred at about the same number of cycles in vacuum as in air but at a higher strain. Above this strain specimens lasted about ten times as long in vacuum as in air. Slip occurred in a similar manner above and below th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Condensation of Borazine to Polycyclic Boron-Nitrogen Frameworks by Pyrolytic Dehydrogenation1A. W. Laubengayer, P. C. Moews Jr., and Richard F. PorterCite this: J. Am. Chem. Soc. 1961, 83, 6, 1337–1342Publication Date (Print):March 1, 1961Publication History Published o…
The magnetic properties of the two intermetallic compound β phase (Fe 1.67 Ge) and δ phase (FeGe 2 ), in Fe-Ge system, were investigated. The β phase has B8 2 type of crystal structure and is ferromagnetic with the Curie point 485°K, saturation magnetization at 0°K 1.59 µ B , and paramagnetic moment 3.14 µ B per iron…
Abstract Various chemical methods of freeing the clay minerals that occur in limestones and dolomites have been used without regard to the effect the chemicals might have on the properties and structures of these clay minerals. A procedure is here suggested that will accomplish the separation without significantly aff…
The behavior of a helical spin configuration of a hexagonal crystal in an applied field is discussed for the case where the axis of the helix is identical with the hexagonal c axis and the magnetization vector in each layer is parallel to the basal plane. In a small field applied parallel to the basal plane, a slight…
Abstract Cellulose‐ und Amylose‐tricarbanilate sind isomere Ketten, die sich nur in ihrer Bindungsart unterscheiden. Ihre Strukturunterschiede werden mit Hilfe von Lichtstreuungs‐ und Viskositätsmessungen in verdünnten Acetonlösungen näher untersucht. Die Abhängigkeit der Trägheitsradien vom Molekulargewicht läßt sich…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation H. Nakayasu, H. Markovitz, D. J. Plazek; The Frequency and Temperature Dependence of the Dynamic…
Abstract The general aspects of the problem of fracture and strength are briefly reviewed. The discrepancy between the observed strength of materials and the theoretical value calculated from the molecular structure is usually ascribed to the presence of adventitious flaws present in all samples tested. The Griffith t…
The pressure and temperature dependences of the self-diffusion coefficients of the linear dimethylsiloxanes, containing from two to nine silicon atoms have been determined by the NMR spin-echo technique. Activation energies and volumes are presented as derived quantities; the constant-volume activation energy is estim…
The magnetic and optical anisotropies observed in oblique-incidence Permalloy films show anomalous behavior for incidence angles greater than 60° (grazing incidence). In particular, the easy axis and the direction of greatest optical absorption are parallel to the vapor beam for incidence angles greater than about 70°…
Films which possess rotatable anisotropy have been observed. In these films, the easy direction of magnetization can be selected by the application of a sufficiently large magnetic field. The temperature dependence of hysteresis and resistivity have been studied. Films have also been examined by electron diffraction c…
Etching experiments are described in which diamonds showing octahedral, cubic and dodecahedral faces are heated in air within the temperature range of 800°c to 1400°c. A change in the etch pit orientations of the characteristic etch pits for these faces has been found as the temperature of etching is raised. Etching w…