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Abstract Satisfactory rigid polyurethane foams were prepared from diethanolamides of hydroxymethylated oleate, linseed oil, safflower oil and their methyl esters. These foams were improved when the fatty polyols were blended with a commercial, low molecular weight polyol.
Abstract Two computer-oriented methods are presented in this paper for interpreting the magnetic anomalies of a dipping dike. In the first method, horizontal derivatives of the observed magnetic anomalies are calculated which define a single linear equation of the type X 4 G + C 1 X 3 G + C 2 X 2 G + C 3 XG + C 4 G +…
Abstract The crystal structure of polychlorotrifluoroethylene has been studied. The pseudohexagonal lattice parameters are a = 6.438, c = 41.5 Å. The polymer chain is found to be helical with on the average 16.8 monomer units in one turn of the helix (equal to c ). The skeletal angles on the CF 2 and CFCI atoms are fo…
Abstract The isothermal crystallization of natural rubber was investigated under biaxial stretching. A marked planar orientation of crystals occurs in such a way that the (010) plane orients parallel to the film plane. The rate of crystallization increases with the biaxial stretching ratio, and the Avrami exponent n d…
Abstract Polyurethane elastomers containing isocyanurate rings as crosslinking structure were prepared by crosslinking the prepolymers in N , N ‐dimethylformamide solution with sodium cyanide catalyst. Physical properties such as gel fraction, swelling ratio, density, glass transition temperature, Young's modulus, ten…
A new technique is presented for the automatic determination of peak positions, intensities and widths from complex numerically recorded X-ray powder diagrams. The method uses standard powders for the determination of the actual repartition of incoming radiations and the determination of the apparatus function (aberra…
A statistical mechanical model of diffusion is applied to helium diffusion in fused silica. The number of gas atoms moving solubility sites is related to the number of atoms in those sites. The number of atoms in the excited state, between two adjacent solubility sites, relative to the number occupying solubility site…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and textural studies in molybdenum sulfide systemsP. Ratnasamy, L. Rodrique, and A. J. LeonardCite this: J. Phys. Chem. 1973, 77, 18, 2242–2245Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1973https…
The elastic properties of tantalum have been investigated over the temperature range 4.2–300 K. The values of the adiabatic elastic constants C11, C44, and CL=(1/2) (C11+C12+2C44) at 4.2 K in units of 1012 dyn/cm2 are, respectively, 2.70, 0.873, and 3.02. The Debye temperature was calculated from the elastic constants…
Studies of infrared quantum counter upconversion in LaF3:Pr3+ and LaCl3:Pr3+ have led to the discovery of a process in which a red excitation photon results in the emission of a blue photon. When the 1D2 level of Pr3+ is excited by a cw rhodamine 6-G dye laser, blue fluorescence from the 3P0 level is observed. From th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of a pentacoordinate copper(II) hippurate dimerJoe N. Brown and L. M. TrefonasCite this: Inorg. Chem. 1973, 12, 8, 1730–1733Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1973htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and reversible ligation studies of new low-spin iron(II) complexes containing a planar cyclic tetradentate ligand and other donor molecules including carbon monoxideD. A. Baldwin, R. M. Pfeiffer, D. W. Reichgott, and Norman J. RoseCite this: J. Am. Chem. Soc. 1973,…
Techniques are investigated for studying the distribution of impurity species away from grain boundary fracture surfaces. The first technique involves the measurement of the relative intensities of the various Auger electrons of the impurity species. A comparison of these intensities with those of the pure bulk elemen…
Single-crystal X-ray intensity data have been obtained from a crystal of ferrohypersthene, M&* Feo* Ctuos SiO, at 2O, 175',280', 50O', 700', and 850'C. Refinements of the crystal structure using three dimensional data and anisotropic thermal models have been made at each temperature. Precession photographs indicate th…
High-resolution inelastic-neutron-scattering measurements have been performed at the cubic-rhombohedral ($\mathrm{Pm}3\mathrm{m}\ensuremath{\rightarrow}\mathrm{R}\overline{3}\mathrm{c}$) phase transitions in a low-mosaic flux-grown single crystal of LaA1${\mathrm{O}}_{3}$. The transition occurred at (489 \ifmmode\pm\e…
Abstract Die Darstellung und die spektroskopische Charakterisierung neuer (Octaäthylporphinato)‐metall‐methoxide und ‐phenoxide der Zusammensetzung. (OÄP)AlOMe 3 , (OÄP)MOPh 4 (M = Ga, Mn), (OÄP)CrOPh(PhOH) 5 , (OÄP)M(OMe) 2 6 (M = Si, Ge, Sn), (OÄP)M(OPh) 2 7 (M Si, Ge, Sn), (OÄP)MO(OMe) 8 (M – Mo, W) und (OÄP)MO(O…
Previous experiments have indicated that the gam gene of bacteriophage lambda is responsible for an inhibition of the RecBC DNase-an enzyme that is essential for the major host pathway of genetic recombination. We report here experiments that define the inhibitor as the protein product of the gam gene ("gamma-protein"…
Abstract Clayey fragments colored deep bluish-green are widely found in glassy rhyolitic tuffs at Oya, Tochigi Prefecture. In room-air the color changes to black or gray within one hour and finally to brown in a few weeks. The fragments are composed of an intimate mixture of two kinds of smectite: a ferrous iron-rich…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTButene isomerization over zinc oxide and chromiaC. C. Chang, W. C. Conner, and R. J. KokesCite this: J. Phys. Chem. 1973, 77, 16, 1957–1964Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1973https://pubs.acs.org…