Materials Literature
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Electron–channelling imaging is a new method for observing defects in solid crystalline samples. The images are observed by scanning electron microscopy with backscattered electrons and have the same origin as the contrast observed in electron–channelling patterns. The observations reported here concern dislocations i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular transformations in the solid state. Crystallographic resolution of the spin isomers of tris(2-picolylamine)iron(II) dichloride and the structural relationship between the methanol and ethanol solvatesBradley A. Katz and Charles E. StrouseCite this: J. Am. Chem. Soc…
Abstract Copolyamide–esters (CPAEs) were synthesized by the amide–ester interchange reaction. The change of intrinsic viscosity during CPAE synthesis was negligible. Polyamide blocks were shortened with increasing reaction time and polyester content. The polymerization degree of nylon 12 blocks on CPAE was smaller tha…
Clothing-comfort assessment by human perception analysis provides a sound basis for comparison of apparel garments under combined microclimates and human-activity levels of normal wear. The perception-analysis process attempts to seek out the wearing conditions that produce differences in human sensation and the descr…
The optical mode structures of solvent cast films of different polymers have been measured with a single prism film coupler. The allowed modes define the index of refraction for light polarized in and perpendicular to the plane of the film. It is shown that the solvent coating process preferentially aligns the polymer…
1. The bacterial distribution of alanine dehydrogenase (L-alanine:NAD+ oxidoreductase, deaminating, EC 1.4.1.1) was investigated, and high activity was found in Bacillus species. The enzyme has been purified to homogeneity and crystallized from B. sphaericus (IFO 3525), in which the highest activity occurs. 2. The enz…
The purpose of this investigation is to employ simple transport laws to gain a perspective of events which occur during early stages of pit initiation and growth. The initiation of pits on the surface of passive metals undoubtedly occurs at flaws in the passive surface film. At the moment of pit initiation, the flaws…
Infrared spectra representative of crystalline regions of cast films of phase-III poly(vinylidene fluoride) (PVF2) have been obtained by absorbance subtraction techniques using a FT-IR instrument. The spectra contain more bands than previously reported and are not consistent with current models for the crystal structu…
Thirty different binary metal oxide glasses having the metaphosphate composition have been prepared containing cations from the following groups: alkali metals, alkaline earths, transition metals, and lanthanide and actinide metals. Far infrared absorption assigned to the cation vibration in its oxygen cage has been m…
This review outlines some relevant aspects of theoretical physics-molecular orbital and other calculation of the properties of point defects, symmetry and group theory, zero-phonon lines and the configuration coordinate diagram. The experimentally observed spectra can conveniently be divided into infrared (<1 eV), whi…
Light-scattering lineshapes in degenerate p-type silicon due to interference between one-phonon (discrete) and inter-valence-band electronic (continuum) scattering amplitudes are investigated quantitatively. The pseudopotential method is used for calculations of both the electronic band structure and electron-phonon i…
The formation of a polymer in a glow discharge is a complex phenomenon, and the interpretation of the formation mechanism is not at all clarified by the misapplication of the term "polymerization". The term "polymerization" is generally accepted to mean that the molecular units (monomers) are linked together by the "p…
Abstract Polymers can be obtained by subjecting an organic or organometallic vapor to the plasma created in an electrical glow discharge. By varying the plasma conditions such as pressure, monomer flow rate, power etc., not only films but also powder and oil are formed In this paper we shall consider both the mechanis…
We demonstrate here that nonlinear mixing of four surface-plasmon waves can be used to probe the Raman resonances of liquids. The results are in good agreement with theoretical prediction. The technique should be useful for surface studies.
Polymers can be obtained by subjecting an organic or organometallic vapor to the plasma created in an electrical glow discharge. By varying the plasma conditions such as pressure, monomer flow rate, power etc., not only films but also powder and oil are formed In this paper we shall consider both the mechanism of poly…
The intrinsic self-diffusion coefficient (D) for cesium-134 in a granitic melt containing 6.1 to 6.3 percent (by weight) of dissolved H(2)O is three to four orders of magnitude higher than the values reported for chemically similar but dry granitic glass. For the temperature interval 700 degrees to 800 degrees C and a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal stability of the triple helix of type I procollagen and collagen. Precautions for minimizing ultraviolet damage to proteins during circular dichroism studiesToshihiko Hayashi, Samantha Curran-Patel, and Darwin J. ProckopCite this: Biochemistry 1979, 18, 19, 4182–4187…
Phonon dispersion and density-of-states measurements are presented for VN, a cubic transition-metal compound with ten valence electrons. The acoustic phonons differ strongly from those observed in nine-valence-electron compounds. In particular, the prominent soft-mode region has moved from the interior to the boundary…
Acoustic emission release during tensile testing of polycrystalline aluminium is measured at room temperature. It is found that acoustic emission power and acoustic emission energy release at yielding and various strains during work- hardening increase with the inverse of the grain diameter. This dependence is explain…
The Raman spectrum of K(TCNQ) crystals has been obtained from 30 to 2300 ${\mathrm{cm}}^{\ensuremath{-}1}$. We have identified lattice modes at 70, 81, 110, 170, 229, and 295 (\ifmmode\pm\else\textpm\fi{}5) ${\mathrm{cm}}^{\ensuremath{-}1}$ and 13 intramolecular modes above 300 ${\mathrm{cm}}^{\ensuremath{-}1}$. The m…