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。
Temperature‐controlled seawater columns were used to investigate settling rates of Ditylum brightwelli grown on light‐dark schedules. Ficoll density gradient centrifugation was used to examine the effects of KCN, DNP, and the ion‐transport modifiers valinomycin, nigericin, and gramicidin on sedimentation characteristi…
Abstract Bench‐scale equipment for wet spinning was designed and built. An experimental study of the wet spinning of several polyamides has been carried out. The polymers studied include nylon 6, nylon 66, redissolved Nomex, and redissolved Kevlar. The superstructure of the wet‐spun fibers were studied by optical and…
Abstract Criteria for minimizing hysteresis in carbon-black-filled elastomer blends are: (1) large black unit size, wide distribution, and low structure; (2) higher black loading in the discrete polymer phase (large zones); and (3) polymer of lower hysteresis as the continuous phase (low black loading). Of the differe…
Abstract This study tested the hypothesis that the level of available P in volcanic ash soils is a rate‐limiting factor for organic matter mineralization. Additions of calcium phosphate to give levels of P of 1,200 and 2,400 ppm significantly increased the amount of N mineralized and CO 2 evolved as compared to soils…
Microscopic studies on thermally induced undulation instabilities of the smectic $C$ phase of pentyloxybenzylideneheptylaniline ($\overline{5}\mathrm{BA}7$) and pentylphenyloctylthiobenzoate ($5\mathrm{PTB}\overline{8}$) are reported. The $A\ensuremath{-}C$ transitions of these compounds appear to be second order. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOccurrence of N-methyl-N-formylhydrazones in fresh and processed false morel, Gyromitra esculentaHeikki Pyysalo and Aimo NiskanenCite this: J. Agric. Food Chem. 1977, 25, 3, 644–647Publication Date (Print):May 1, 1977Publication History Published online1 May 2002Published in…
Infrared and Raman spectra were measured and interpreted for two crystalline VPO 5 phases (α- and β-VPO 5 ) and several related vanadium phosphate glasses. The spectral results for the crystalline phases were consistent with those predicted by factor group analysis using the previously determined space groups. Empiric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Model for the Kinetics of Plasma PolymerizationJ. M. Tibbitt, R. Jensen, A. T. Bell, and M. ShenCite this: Macromolecules 1977, 10, 3, 647–653Publication Date (Print):May 1, 1977Publication History Published online1 May 2002Published inissue 1 May 1977https://pubs.acs.org/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge distribution in large polyoxoanions: determination of protonation sites in vanadate (V10O286-)by oxygen-17 nuclear magnetic resonanceW. G. Klemperer and Wilfred ShumCite this: J. Am. Chem. Soc. 1977, 99, 10, 3544–3545Publication Date (Print):May 1, 1977Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydridorhodium(III) porphyrin and porphyrin rhodium(II) dimerH. Ogoshi, J. Setsune, and Z. YoshidaCite this: J. Am. Chem. Soc. 1977, 99, 11, 3869–3870Publication Date (Print):May 1, 1977Publication History Published online1 May 2002Published inissue 1 May 1977https://pubs.ac…
Densification rates are reported for 3 classes of porous glass materials: soot preforms made by flame hydrolysis, silica gel, and phase‐separated and leached borosilicate glass. Viscosity values obtained by fitting the densification data to the theory of Part I of the present study are in reasonable agreement with vis…
The thermal expansion coefficient and aqueous dissolution rate were measured for alkali phosphate glasses containing a third and fourth component. For a given series, both properties increased monotonically as the radii of the alkali ions increased. The observed expansion coefficients were in the range 99 to 286 × 10…
The effect of molybdate ions on the repassivation kinetics of iron has been studied by measuring anodic current transients following in situ film removal by abrasion. In solutions containing both chloride and molybdate ions, it was found that although pits initiate, they do not propagate when molybdate ions are presen…
Results of calculations of vibrational densities of states and of infrared and Raman spectra for relatively large model structures representing elemental amorphous semiconductors are presented and discussed. Models for four-coordinated (germanium-like), three-coordinated (arsenic-like), and two-coordinated (selenium-l…
The solar absorptance of a single ideal film on an idealized metallic substrate has been calculated as a function of its optical constants to determine the optimum parameters for selective absorber applications. High normal solar absorptances (>0.9) are possible for single uniform interference films if n < 1.5 and 0.2…
The equilibrium constants and rate constants for the formation of inclusion complexes of cycloheptaamylose with small inorganic anions were measured by a spectrophotometric technique and an ultrasonic relaxation technique respectively. The stability of the complexes of anions with cycloheptaamylose decreased. Comparis…
Successive phase transformations in ${\mathrm{K}}_{2}$Se${\mathrm{O}}_{4}$ at ${T}_{i}=130$ K and ${T}_{c}=93$ K were studied by the neutron-scattering technique. The superlattice reflections in the intermediate phase were found to be incommensurate with the lattice periodicity. The wave vector characterizing the refl…
This review is concerned mainly with conventional transmission electron micro scopy (TEM) and its application to mineralogy and geology. However, I indulge in some speculation at the end about new developments and how they might be used to advantage by the mineralogist. Although TEM became a routine tool of the physi…
SUMMARY A technique is described for obtaining clean cut surfaces on wood samples prepared for the scanning‐electron microscope.
By considering the variation of charge-transfer energy and of the intensity parameters across isostructural series it is concluded that charge-transfer mixing is of negligible importance in accounting for the intensity of the hypersensitive transitions of the trivalent lanthanides. The experimental relationship betwee…