Materials Literature
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A method is outlined to study the structure property relationship in semicrystalline fibers involving (a) the characterization of structure in terms of the two phase amorphous-crystalline model (size, concentration and orientation of the crystallites, etc.), (b) the analysis of viscoelastic responses in terms of Takay…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStoichiometry and kinetics of the thermal decomposition of molten anhydrous lithium nitriteA. K. K. Lee and E. F. JohnsonCite this: Inorg. Chem. 1972, 11, 4, 782–787Publication Date (Print):April 1, 1972Publication History Published online1 May 2002Published inissue 1 April…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeformation mechanisms of polyethyleneRichard S. SteinCite this: Acc. Chem. Res. 1972, 5, 4, 121–127Publication Date (Print):April 1, 1972Publication History Published online1 May 2002Published inissue 1 April 1972https://pubs.acs.org/doi/10.1021/ar50052a001https://doi.org/1…
Abstract Alteration products of volcanic materials from various localities in Wyoming, U.S.A., Italy, Yugoslavia and Mozambique are mainly smectites and cristobalites with small amounts of kaolinite. Smectite and cristobalite form separate and intergrown aggregates of microcristallinity. X-ray diffraction studies show…
The low-temperature thermoelectricity has been studied extensively for single-crystal graphite and highly oriented pyrolytic graphites (PG) annealed at 3600°c, 3200°c and 2800°c respectively. In the thermoelectric power versus temperature diagram for these specimens, the characteristic phonondrag dip is found to deepe…
The Helfrich theory of conduction-induced alignment in nematic liquid crystals is extended to describe the dependence of alignment upon voltage above threshold. Alignment angle, saturation alignment, flow velocity, and shear are computed. Experimental measurements of these parameters for p-azoxyanisole are in good agr…
A detailed theoretical study has been made of the magnetoelastic perturbation of the spectra of elementary spin and lattice excitations in Tb and Dy metals. The theory was formulated on the basis of an interaction formed from bilinear products of local spin and strain functions. Previous ad hoc models appear in certai…
Von den gemessenen Übergangsfrequenzen wurde die Hyperfeinaufspaltung abgezogen, wobei kieine Korrekturen durch die unaufgeföste Cs-HFS berücksichtigt wurden.Man erhält so die Frequenz rs des hypothetischen Rotationsübergangs ohne HFS.In Tab. 2 werden diese Frequenzen mit denen, die man aus den von HONERJÄGER und TISC…
Auger electron peaks at 94 and 87 eV have been observed in the dN(E) /dE of the secondary-electron energy distribution N(E) from oxidized Be. These peaks are explained in terms of 1s2p2p (94 eV) and 1s2s2s (87 eV) transitions. This interpretation is consistent with an energy-level diagram and a total-density-of-states…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIonization behavior of the cleft carboxyls in lysozyme-substrate complexesS. M. Parsons and M. A. RafteryCite this: Biochemistry 1972, 11, 9, 1633–1638Publication Date (Print):April 1, 1972Publication History Published online1 May 2002Published inissue 1 April 1972https://pu…
Two experimental approaches were used to estimate the relative efficacy of three germicidal preparations as postmilking teat dips. In successive trials of 17 and 7 months, ehlorhexidine (.2%) and a commercial iodophor (1% available iodine) each reduced the overall new intramammary infection to 4 to 5 per hundred cows…
The failure of aluminum-to-gold ultrasonic bonds, after storage at elevated temperature, is often accompanied by the presence of "purple plague". However, this purple intermetallic phase can also be present in bonds that remain strong after the same treatment. Bond failure has been connected with the presence of impur…
1. The epidermis of Glycera consists of interdigitating columnar cells and mucus secreting goblet cells. Both types of cells are covered by a collagenous cuticle, 1 to 12 µm thick. 2. The cuticle is made up of layers of orthogonally arranged tubules in an amorphous matrix. Individual tubules measures 0.1 to 0.3 µm in…
The Palana palynological assemblage described here consists of 8 genera and 11 species of pteridophytic spores, 24 genera and 36 species of angiospermic pollen grains, 9 genera and 16 species of algal and 3 genera and 4 species of fungal remains. Of the total of 44 genera and 67 species recorded, 10 genera and 31 spec…
Single crystals of polyethylene are investigated by transmission electron microscopy. The observed effects suggest that in polyethylene screw dislocations exist, the Burgers vector of which is parallel to the chain molecules. The dislocation densities were between 108 and 1010 cm−2. Evidence for the splitting of the o…
A model of the crystal-melt interface is proposed which specifically accounts for a reduced liquid entropy in the region of the interface. Based on this model, the interfacial free energies of Ag, Al, Na, and Li are calculated, and the values thus determined are in excellent agreement with experimental values.
Neutron diffraction measurements were made on single crystals of KCN to obtain information about the disorder of the CN− ions in the cubic phase. The crystals were obtained by pulling from the melt by a modified Czochralski method. Data were collected on two four-circle diffractometers at room temperature and at 180°K…
Abstract By using the carbon‐13 NMR technique, it is shown that there are no cis ‐1,4– trans ‐1,4 linkages in a n ‐BuLi‐catalyzed polybutadiene. The polymer consists of “blocks” of cis ‐1,4 units and trans ‐1,4 units separated by isolated vinyl units. Preliminary evidence suggests this might also be true for other typ…
The optical properties of a thin film of liquid crystal, with one of its surfaces bounded by the isotropic liquid of the same compound, reveal the existence of point defects in the liquid crystal. Particular sample geometries are examined in which the detailed structure of the optical patterns seen with polarized ligh…
Abstract The surface oxidation of polypropylene films which occurs during ultraviolet irradiation in air was found to result in extensive surface restructuring. This restructuring was detected by changes in surface infrared spectra, as measured by attenuated total reflection spectroscopy, and by electron microscopy. T…