Materials Literature
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The growth behavior, time of nucleation, and morphology of Ca(OH) 2 crystals formed during the hydration of Ca 3 SiO 5 , at 15°, 25°, and 35°C at water‐solid ratios ( w/s ) from 0.3 to 5.0 were studied by optical microscopy. In samples with w/s >0.5 growth of Ca(OH) 2 in the c ‐axis direction is initially dominant.…
Two specific examples of the application to computer memories of order-disorder transitions in amorphous semiconductors are discussed. The particular physical changes utilized and accompanying the order-disorder transition are a resistance change and an optical change. The resistance change is applied to an electrical…
Abstract The gene encoding threonine synthetase has been located by genetic transformation in Bacillus subtilis. Its position is adjacent and central to the genes encoding homoserine dehydrogenase and homoserine kinase. Its mutational sites are closely linked to, and interspersed among, several mutational sites affect…
Results of an extensive experimental program on the ablation of ATJ graphite in air at surface pressures of 0.3 to 4.4 atm and surface temperatures of 2570 to 4030 K are presented. The measured mass-loss rates are correlated with surface temperature, pressure, and effective nose radius. The results are compared with s…
Abstract The effect of water on the low‐frequency (10 2 ‐10 5 H z ) complex permittivitv of native, sold‐state collagen has been investigated experimentally. Measurements at ambient temperature show that dry collagen exhibits essentially no frequency or temperature dependence. As water is absorbed, both dielectric con…
The emission spectra of phthalocyanine single crystals and evaporated films were investigated in the near infrared. In a H 2 Pc single crystal, several fluorescence peaks were observed between 760 mµ∼1 µ. In a CuPu single crystal, one phosphorescence band with fine structures was observed at 1.12 µ. However, no fluore…
Abstract X-ray diffraction patterns for mixed-layer kaolinite-glycerine-saturated montmorillonite were calculated, taking into account the differences of scattering power of kaolinite and montmorillonite layers. The data were compared with the experimental results for two kaolinite-montmorillonite mixed-layer minerals…
Sc(2)O(3) and Y(2)O(3) films were prepared by evaporation from resistance heated boats in a residual gas atmosphere of oxygen. Films of much lower absorptance were obtained than from coatings produced in high vacuum. The short wavelength limit of high transparency was between 300 nm and 400 nm, while the long waveleng…
The effect of the addition of gypsum to a solution of calcite in water (or the addition of calcite to a solution of gypsum in water) is determined theoretically for arbitrary temperature, carbon dioxide content, and degree of saturation with respect to calcite (or gypsum). The results can be used to study the chemical…
A review of the main features of chalcogenide glass switches is given and interpreted in terms of a thermal runaway mechanism. It is shown that a simple one-dimensional theory is insufficient for describing thin films, and several developments are discussed, including field-dependent effects, channeling instabilities,…
Abstract Macrocyelic polyether sulfides have been prepared by reacting an oligoethylene glycol dichloride with a dithiol or sodium sulfide in ethanol. The trivial naming system for these compounds is an extension of the trivial crown nomenclature (5). A thia prefix is used to show that sulfur atoms have replaced ether…
The hydrolysis product of a quaternary amine-containing organosilicon salt, 3-(trimethoxysilyl)-propyldimethyloctadecyl ammonium chloride, was found to exhibit algicidal activity while chemically bonded to a variety of substrates. Six representative species of Chlorophyta, Cyanophyta, and Chrysophyta were used to eval…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvation of the polymer matrix. Source of truncated and failure sequences in solid phase synthesisWilliam S. Hancock, David J. Prescott, P. Roy Vagelos, and Garland R. MarshallCite this: J. Org. Chem. 1973, 38, 4, 774–781Publication Date (Print):February 1, 1973Publication…
The temperature dependence of the EPR linewidth of the ${\mathrm{Fe}}^{3+}$ -${V}_{\mathrm{O}}$ pair center in SrTi${\mathrm{O}}_{3}$ has been investigated above and below ${T}_{c}=105.6$ K. It is shown from the angular dependence that the pronounced line broadening near ${T}_{c}$ results from rotational fluctuations…
A perturbation solution is obtained for outward and partial inward spherical solidification of a liquid initially at the freezing temperature. The constant-wall-temperature boundary condition is considered with the properties of the solidified material assumed as constants. A nonlinear transformation is applied to the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimeric structure of a copper phthalocyanine polymorphJames H. Sharp and Martin AbkowitzCite this: J. Phys. Chem. 1973, 77, 4, 477–481Publication Date (Print):February 1, 1973Publication History Published online1 May 2002Published inissue 1 February 1973https://pubs.acs.org/…
Abstract As model polymers for isolated short‐chain branches in low‐density polyethylene, a series of ethylene–1‐olefin copolymers was examined by use of 13 C NMR at 25.2 MHz. An array of 13 C resonances was observed that could be associated independently with methyl through amyl branches. The 13 C chemical shifts bec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSteric and electronic effeccts in the coordination of amines to a cobalt(II) porphyrinF. Ann. WalkerCite this: J. Am. Chem. Soc. 1973, 95, 4, 1150–1153Publication Date (Print):February 1, 1973Publication History Published online1 May 2002Published inissue 1 February 1973http…
It is shown that the Frank elastic constants may be expressed in terms of even-order Legendre polynomials averaged over the one-molecule orientational distribution function. In particular, it is found that $\frac{({K}_{11}\ensuremath{-}\overline{K})}{\overline{K}}=C\ensuremath{-}3{C}^{\ensuremath{'}}\frac{{\overline{P…
We present a theoretical and experimental study of the electron-spin-resonance (ESR) line shape in Heisenberg linear-chain systems which have small but non-negligible interchain coupling. Weak interchain coupling can drastically alter the characteristic one-dimensional line shape as well as produce three-dimensional o…