Materials Literature
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The Stoner-Wohlfarth coherent rotation model has been extended to particle sizes approaching the superparamagnetic critical size Scfor the case of barium ferrite. It is shown that at particle volumes up to100 S_{c}, the coercivity factor will be lower than the Stoner-Wohlfarth factor of 0.48. Experimentally, micro-pow…
Abstract Differential thermal analysis (DTA) of some commercial nylons has disclosed some anomalous phenomena with respect to the glass transition, generally considered to occur at 40–50°C. On the first heat cycle the transition occurs normally. On cooling, however, no corresponding transition occurs, and on an immedi…
Data concerning the types of charge carrier responsible for electrical conduction in single‐crystal aluminum oxide are reviewed, and explanations are offered for discrepancies in terms of the experimental conditions. Measurements on undoped and Co 2+ and Mg 2+ doped crystals, made using a volume guard to avoid surface…
Abstract The autoxidation of organic compounds, RH, occurs by a radical‐catalyzed chain reaction to give hydroperoxides, RO 2 H, as primary products. The initial rate is ‐d[O 2 ]/dt = k p [RH] {k i [Cat]/k t } 1/2 , or in the presence of an inhibitor, (In), k p [RH](k i [Cat]/k I [In]), where k p is the chain propagat…
1. Insoluble polymeric collagens from various human tissues were prepared by the EDTA method. Almost all of the collagen from simple soft tissues such as dermis, tendon, submucosa, sclera and cornea could be extracted, whereas the more complex tissues such as intercostal cartilage and intervertebral disc yielded only…
Abstract The dehydrochlorination of PVC under vaccum has been studied at 170–200°C by a volumetric method. The accelerating effect of HCl is related to its interaction with the forming polyene units of macromolecules. A mechanism is proposed. The effects of various stabilizers, such as organic salts of Ca, Ba, Cd, tri…
Abstract Nitrate adsorption by subsoils of Andepts, Oxisols, and Alfisols from Mexico and South America was studied using a batch‐type technique. Nitrate adsorption increased as the acidity of the suspension increased to about pH 3.5. This increase was directly proportional, but not equivalent, to the amount of hydrog…
Eigh t iso th ermal e quati ons of s ta te a re analyze d to yield quantitativ e m eas ures of th e degrees to whi c h eq uat ion pa irs can be di sc rimin ated for real data , data of limite d s pan a nd prec is ion. Calc ul a ted c urv es a ll ow one to assess th e spa n a nd precis ion necessa ry in PV data to a ll…
Abstract The infrared spectra of undenatured bovine tendon collagen were investigated at 25°C and relative humidities from 0 to 95%. Suitable samples were prepared by forcing frozen suspensions of the material in distilled water through a stainless steel capillary. The samples were investigated by electron microscopy…
Abstract Systeme aus monomolekularen Schichten können Funktionseinheiten bilden, welche Eigenschaften entfalten, die den Einzelschichten fehlen. So findet z. B. bei UV‐Bestrahlung ein Energieübergang von einer Sensibilisator‐(S‐) Schicht auf eine Acceptor‐(A‐) Schicht statt, der sich durch Fluoreszenz von A zu erkenne…
Abstract Physical changes induced by prolonged Ca(OH) 2 ‐treatment were determined for natural peds from specific horizons of Beaumont, Hiwassee, Houston Black, Katy, and Nacogdoches soils. Confined swelling pressures, liquid limits, and plasticity indexes decreased substantially for soil peds treated with 5% Ca(OH) 2…
Abstract The rates of shear encountered in topical application of cosmetic creams and lipstick were obtained by dividing the application velocities, at which the samples are being sheared, by the applied thicknesses of the layer. The application velocity was measured by means of a high‐speed camera. Beauty artists, fo…
Abstract On the basis of morphology, pH, and solubility in Na 4 P 2 O 7 , three Wisconsin histosols were classified as (i) a Fibrist, (ii) a Hemist, and (iii) a Saprist. Fiber content was found to be the single most useful characteristic in the classification of these Histosols, and in quantifying various stages of de…
Abstract This study was undertaken to measure quantitatively the flammability characteristics of cotton and polyester fibers. The smoke density generated during the burning of these fabrics was also studied at various temperature conditions. A mathematical relationship was established between the results obtained in a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight-Scattering Studies on Polystyrene-Polyisoprene Block CopolymersJ. Prud'homme and S. BywaterCite this: Macromolecules 1971, 4, 5, 543–548Publication Date (Print):September 1, 1971Publication History Published online1 May 2002Published inissue 1 September 1971https://pub…
Abstract The γ‐alumina polymerization of furfuryl alcohol produces a polymer differing in structure from that obtained by polymerization with acid catalysts. In order to gain a better understanding of the basic chemistry of this method of polymerization furfuryl alcohol, studies were done, both with γ‐alumina‐polymeri…
Abstract Through the use of accelerators containing higher alkyl substitution, we have been able to attain improved properties of EPDM diene rubber blends. EPDM/NBR blends vulcanized with sulfur cure systems employing these accelerators compete favorably with CR compounds in heat aging; have essentially the same oil r…
The polarized optical spectrum of Er3+ in calcium tungstate at 4.2 and 77°K is reported. Radial integrals and spin-orbit coupling parameter derived from fitting the position of the centers of gravity of the J manifolds in intermediate coupling are F2=423.89 cm−1, F4=67.995 cm−1, F6=6.667 cm−1, ζ=2377 cm−1. A first-ord…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotentiometric study of the dissociation of the tetrachloroaluminate ion in molten sodium chloroaluminates at 175-400.deg.G. Mamantov and G. TorsiCite this: Inorg. Chem. 1971, 10, 9, 1900–1902Publication Date (Print):September 1, 1971Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImidazole Complexes as Hardeners for Epoxy AdhesivesR. Dowbenko, C. C. Anderson, and W. -H. ChangCite this: Ind. Eng. Chem. Prod. Res. Dev. 1971, 10, 3, 344–351Publication Date (Print):September 1, 1971Publication History Published online1 May 2002Published inissue 1 Septemb…