Materials Literature
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The static and cyclic fatigue behavior of sintered silicon nitride was investigated at room temperature. Flexure specimens, with an indentation‐induced flaw at the center, were tested under a static or cyclic load applied by four‐point bending. Sintered silicon nitride was shown to be susceptible to static and cyclic…
Two classes of DNA elements interrupt a fraction of the rRNA repeats of Bombyx mori. We have analyzed by genomic blotting and sequence analysis one class of these elements which we have named R2. These elements occupy approximately 9% of the rDNA units of B. mori and appear to be homologous to the type II rDNA inserti…
Smectic layering at the surface and smectic fluctuations in the bulk can be studied simultaneously by x-ray specular reflectivity and scattering measurements. There is a peak in the angular dependence of the specular reflectivity due to surface-induced smectic layering that penetrates into the bulk as exp(-z/${\ensure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature-programmed desorption of carbon monoxide and carbon dioxide from platinum/ceria: an important role for lattice oxygen in carbon monoxide oxidationT. Jin, T. Okuhara, Gilbert J. Mains, and J. M. WhiteCite this: J. Phys. Chem. 1987, 91, 12, 3310–3315Publication Dat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the charge-transfer salt of decamethylcobaltocene and tetracyanoethylene (2:1): {[Co(C5Me5)2]+}2[(NC)2CC(CN)2]2-. The electronic structures and spectra of [TCNE]n (n = 0, 1-, 2-)David A. Dixon and Joel S. MillerCite this: J. Am. Chem. Soc.…
Thermoelectric power (S) measurements are reported in some ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4\mathrm{\ensuremath{-}}\mathrm{y}}$ oxides with Ba and Sr doping. S gradually decreases with increasing dopant concentration x, and for small concentration the trend can be described by assuming strong correlations. While S…
Conducting polythiophene derivatives with substituted long alkyl chain such as poly(3-octylthiophene), poly(3-dodecyl-thiophene) and poly(3-dococylthiophene) etc. Have for the first time been found to be fusible by heating in a relatively low temperature range. The film formed by the hot press method at a temperature…
A systematic study of the magnetic properties of melt-spun amorphous ${\mathrm{Fe}}_{\mathrm{x}}$${\mathrm{Zr}}_{100\mathrm{\ensuremath{-}}\mathrm{x}}$ alloys with 88\ensuremath{\le}x\ensuremath{\le}93 using M\"ossbauer and magnetization measurements has established the magnetic phase diagram. The ordering temperature…
Microstructural characteristics of long-term-aged cast duplex stainless steel specimens from eight laboratory heats and an actual component from a commercial boiling water reactor have been investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), small angle neutron scattering (SANS)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlasticization of poly(butyral-covinyl alcohol)Jacob Schaefer, Joel R. Garbow, E. O. Stejskal, and J. A. LefelarCite this: Macromolecules 1987, 20, 6, 1271–1278Publication Date (Print):June 1, 1987Publication History Published online1 May 2002Published inissue 1 June 1987htt…
The effect of high intensity heat on the transient thermophysical properties has been investigated for eight protective fabrics made with polybenzimidazole (PBI), Kevlar®, Nomex®, and blends of PBI with Kevlar® or rayon fibers. Exposure conditions used for this study were 2.0 cal/cm 2 .s, 50/50 radiant/convective, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel synthesis of polyketone via radical ring-opening polymerization of 2,2-diphenyl-4-methylene-1,3-dioxolaneYoichi Hiraguri and Takeshi EndoCite this: J. Am. Chem. Soc. 1987, 109, 12, 3779–3780Publication Date (Print):June 1, 1987Publication History Published online1 May…
Experimental fabrics have been knitted from high level blends of cotton and common milkweed fibers. The milkweed fiber ( Asclepias syriaca), often called "vegetable silk," is a seed floss that is similar to the Rux fiber ( Caleotropis gigantea ) of Southeast Asia. The physical properties of the milkweed fiber, its mor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNickel, cobalt, and copper complexes of o-benzenediselenolate: synthesis and structural and magnetic propertiesDaniel J. Sandman, Gregory W. Allen, Lewis A. Acampora, James C. Stark, Susan Jansen, M. Thomas Jones, Geoffrey J. Ashwell, and Bruce M. FoxmanCite this: Inorg. Che…
Abstract The literature on polyamides was reviewed to determine the nature and extent of information available on these materials which are commonly used in consumer and industrial applications. This review was limited to aliphatic polyamides normally called nylon and excludes aromatic polyamides such as Nomex and bic…
Abstract The 57 Fe Mössbauer spectra of an iron-rich montmorillonite, an illite, and two glauconites were measured and computer-fitted with appropriate Fe 3+ and Fe 2+ doublet resonances. The broad experimental Fe 3+ resonance of montmorillonite probably arises from Fe 3+ in the octahedral sites and a trans-arrangemen…
Abstract Lanthanoid(III) picrates (Ln=La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, and Yb) were prepared from picric acid and the corresponding lanthanoid carbonates in good yields. Combustion analyses, ICP emission analyses, and UV spectrophotometry have shown that the light lanthanoid picrates, i.e. Ln=La–Gd, are all undecahydra…
Abstract Silico-ferric coprecipitates, with chemical formula , were aged in suspension at 75°, 100° and 150°C and the structural evolution of solids with time studied by XRD, TEM, and IR, Mössbauer and EXAFS spectroscopy. The initial Si-Fe coprecipitate was found to be amorphous but showed local order similar to that…
Abstract Temperature-programmed desorption (TPD) and IR spectroscopy were used to characterize the number and strength of acid sites in Al 3+ -, Cr 3+ - and Fe 3+ -exchanged montmorillonite. The bases pyridine and n -butylamine occupied three different sites in the interlamellar space: (i) physisorbed base, (ii) base…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExploration of structure, electron density distribution, and bonding in coesite with Fourier and pseudoatom refinement methods using single-crystal x-ray diffraction dataK. L. Geisinger, M. A. Spackman, and G. V. GibbsCite this: J. Phys. Chem. 1987, 91, 12, 3237–3244Publicat…