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 Four topics related to the cationic polymerization of cyclic acetals and mainly based on the author's results are reviewed. The kinetics of the H − transfer from linear and cyclic acetals and ethers to the triphenylmethyl cation were examined. A linear correlation between the 1 H‐NMR shift of the H‐atom to be…
The crystallization and amorphization of Te-As-Ge films with GaAs injection lasers has been investigated. Power density measurements for crystallization and amorphization are presented, and a reverse-mode write-read-erase cycle is demonstrated. The results show that direct bit storage is feasible with an injection las…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcidites and partition coefficients of fluoromethanesulfonamidesR. D. Trepka, J. W. Belisle, and J. K. HarringtonCite this: J. Org. Chem. 1974, 39, 8, 1094–1098Publication Date (Print):April 1, 1974Publication History Published online1 May 2002Published inissue 1 April 1974h…
The cell wall of Sulfolobus acidocaldarius has been isolated. Cells were mechanically disrupted with a French press, and the cytoplasmic membrane was removed by extracting cell-envelope fragments with Triton X-100. The Triton-insoluble cell wall material retained the characteristic subunit structure when examined in t…
Abstract Semicrystalline polymers generally exhibit moduli well below their theoretical limit due to chain folding and to lack of crystal alignment. Modulus increases attainable through standard drawing procedures are limited by sample fracture before large draw ratios are reached. Using an Instron capillary rheometer…
Measurements on the mechanical properties of copper-bismuth alloys show that the only effect of bismuth within the solid solution range is to reduce the true tensile strength of the alloys—there is no detectable effect on plastic behaviour or on the elastic limit. Intergranular fracture occurs by the formation of grai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of a hexanuclear nickel carbonyl dianion, bis(tri-.mu.2-carbonyl-tricarbonyltrinickel)(2-), and comparison with bis(tri-.mu.2-carbonyl-tricarbonyltriplatinum)(2-). Unprecedented case of a metal cluster system possessing different metal architectures f…
Abstract In hydrothermal reactions of lime and quartz with water or aqueous NaOH at 150 °C or 180 °C and Ca: Si = 0.83, the rate of reaction of the quartz increases with NaOH concentration. At 180 °C and Ca: Si = 0.83, the conversion into tobermorite of the semi‐crystalline calcium hydrosilicate initially formed occur…
The unified theory of absolute intensity measurements in small-angle X-ray scattering has been experimentally verified by determining a collimation system and wavelength-independent calibration constant for polyethylene (Lupolen). Consistent values of this constant were determined for three X-ray wavelengths (Ag Kα, M…
Abstract Isomeric homopolymers and random copolyesters based on sebacic acid and isomeric hexanediols were synthesized by condensation techniques and characterized by NMR, GPC, intrinsic viscosity, and DSC. Among the homopolymers, only the polyester derived from the linear 1,6‐hexanediol was found to be crystalline. T…
A general geometrical model, based on the assumption of a constant unit-cell configuration for a particular knitted construction and derived by the present author in a previous publication is applied to plain, interlock, and various rib-knitted constructions to enable simple relations to be derived for the effective d…
In order to illustrate the concepts of antibound ‘state’ and resonance, we present some simple examples of elastic scattering in one dimension. The phase shift, scattering probability, time delay, and wave amplitude are plotted as a function of energy for a particle incident on a square well (deuteron) and a square we…
The optical absorption, emission, and excitation spectrum and the exchange splittings of the first-neighbor ${\mathrm{Cr}}^{3+}$ pairs in ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ have been studied. The earlier experimental level assignment is shown to be inconsistent with the theory of Pryce and Naito. The new ground-sta…
The objective of this work was to determine the Cu diffusion coefficient in silver thin films as a function of temperature, and Cu electromigration velocity as a function of electric current density and to test whether linearity between electromigration and current density was preserved at high current stress. An Ag s…
Mössbauer effect study of bcc Fe-Mn alloys has been made for compositions up to about 13% Mn. The data can be interpreted on the assumption that the Fe and Mn moments are almost constant being 2.2 µ B and 0.9 µ B , respectively, which is consistent with various NMR data, and also with the CPA calculation by Hasegawa a…
Pressure treatment of TlInS 2 -I at 30 kbar, 300°C yielded the rhombohedral modification TlInS 2 -II (space group R3̄m, α = 3,83 Å, c= 22,23 Å, Z = 3). TlInS 2 -II has a-NaFeO 2 -structure and is metastable at all ρ, T-conditions investigated. At 30 kbar, 400°C, TlInS 2 -I and TlInS 2 -II transform to the hexagonal mo…
Abstract Poly(vinyl chloride) (PVC) alone or mixed with 10 wt‐% and 50 wt‐% TiO 2 , SnO 2 , ZnO, and Al 2 O 3 were pyrolyzed by using a pyrolysis gas chromatograph. Benzene, toluene, ethylbenzene, o ‐xylene, styrene, naphthalene, and various chlorobenzenes were identified. No hydrocarbons could be detected in pyrolysi…
Magnetization measurements of α-phase Fe-Mn alloys, in which manganese concentration is extended up to 11 at% by cold-working techniques, have been made from liquid He temperature to room temperature. The magnetic moment decreases linearly with increasing manganese concentration and assuming that the magnetic moment o…
Abstract Reviewed here is the kinetics of crystal growth of sparingly soluble minerals such as calcium carbonate, calcium sulfate, and barium sulfate, which frequently cause scaling problems in oil fields. For all three electrolytes, the crystal growth is surface controlled and follows a second-order rate law with an…
The kinetics of K + ‐Na + exchange in sodium borosilicate glasses containing 20 mol% Na 2 O were studied as a function of glass composition and exchange time and temperature. The distribution of K in the glass after exchange in molten KNO 3 was determined using an electron microprobe. In those specimens which were not…