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Abstract A preliminary set of ‘rules’ for acid-catalysis by ion-exchanged montmorillonites has been derived from the reaction of alkenes, alcohols and alicyclic acids over such catalysts. It has been shown that: 1. Cr(III) and Fe(III) are the most active interlayer cations. Although Al is also active, the exact proced…
Abstract Compositions and elemental distributions of anodic films formed on aluminium in aqueous borate electrolytes have been investigated by Rutherford backscattering spectroscopy (RBS) and associated nuclear reaction methods, together with controlled crystallization of film sections in the transmission electron mic…
Experimental studies were performed in a 4.8×2.8×3.5 m3 cold room with a HV transformer of 124 kVA, 120 kV. Atmospheric ice was accreted on a vertical string of three types of insulators: a classic glass insulator and two long-rod synthetic insulators. The results obtained show that flashover occurs at the lowest volt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and stereochemistry of mono-, bi-, and tetranuclear manganese thiolatesThomas Costa, Jay R. Dorfman, Karl S. Hagen, and R. H. HolmCite this: Inorg. Chem. 1983, 22, 26, 4091–4099Publication Date (Print):December 1, 1983Publication History Published online1 May 2002P…
The results of extensive studies of magnetic properties for the spinels ${\mathrm{Cu}}_{x}{\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{2}{\mathrm{Se}}_{4}$ are summarized. They concern the isotherms of static magnetization in applied induction up to 14 T, the N\'eel temperature ${T}_{N}$ (for $x\ensuremath{\le}0.1$)…
From the measurements of dielectric constants and X-ray diffraction profiles on a random mixture of a ferroelectric and an antiferroelectric, Rb 1- x (NH 4 ) x H 2 PO 4 , for \(0.3{\lesssim}x{\lesssim}1.0\), the phase diagram was determined. For \(0.8{\lesssim}x{\lesssim}1.0\) the long range antiferroelectric phase wa…
Thermoelectric coefficient measurements in the system Fe 3 O 4 ‐Fe 2 TiO 4 were used to determine the cation distributions from 600° to 1300°C. The cation distributions obeyed the relation ‐RT In K=‐9.61+2(‐0.0154 T ) b +0.0256 T (kJ/mol) where K Fe cd is the iron distribution constant and b is the tetrahedral Fe 3+ c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of long-distance ruthenium-to-copper electron transfer in [pentaammineruthenium histidine-83]azurinNenad M. Kostic, Ruth Margalit, Chi Ming Che, and Harry B. GrayCite this: J. Am. Chem. Soc. 1983, 105, 26, 7765–7767Publication Date (Print):December 1, 1983Publicatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of the spiropyran-merocyanine conversion in solutionY. Kalisky, T. E. Orlowski, and D. J. WilliamsCite this: J. Phys. Chem. 1983, 87, 26, 5333–5338Publication Date (Print):December 1, 1983Publication History Published online1 May 2002Published inissue 1 December 198…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSymmetry of the magnetic orbitals and exchange interaction in copper iron (CuIIFeIII) and copper chromium (CuIICrIII) heterobinuclear complexes. Crystal structure of CuFe[(fsa)2en]Cl(H2O)(CH3OH).CH3OHYves Journaux, Olivier Kahn, Jacqueline Zarembowitch, Jean Galy, and Joel J…
ADVERTISEMENT RETURN TO ISSUEPREVArticleConformational flexibility and photochemistryPeter J. WagnerCite this: Acc. Chem. Res. 1983, 16, 12, 461–467Publication Date (Print):December 1, 1983Publication History Published online1 May 2002Published inissue 1 December 1983https://pubs.acs.org/doi/10.1021/ar00096a006https:/…
An X-ray survey of 71 globular clusters has been conducted with the Einstein Observatory. Fourteen new X-ray sources have been discovered in seven globular clusters; this brings to 18 the total number of known X-ray emitting globular clusters in the Galaxy. Multiple sources have been detected in NGC 5139 (ω Cen) and N…
Twenty‐seven mullite‐matrix aluminosilicate refractory bodies in three different refractory systems were synthesized and their thermal expansions were measured and then correlated with their corundum and mullite contents by regression analyses. Thermal expansion coefficients were also calculated from the physical prop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic and equilibrium studies of complex formation of nickel(II) with carboxylate ligands at high pressure. 2. Nickel(II) glycolate and nickel(II) lactateTohru Inoue, Kazuhiro Sugahara, Kiyotaka Kojima, and Ryosuke ShimozawaCite this: Inorg. Chem. 1983, 22, 26, 3977–3981Pu…
The optical properties of Te suboxide type optical memory disk media have been analyzed in terms of the Maxwell Garnett theory of particulate composites. Using the optical indices reported in the literature for amorphous and polycrystalline Te the essential features of the reflectivity spectrum of an optical disc cons…
A computer program for the deconvolution of X-ray diffraction profiles has been written in Fortran IV. The deconvolution procedure is based on the minimization of the difference between the observed data function and a calculated function, where the latter is the convolution of the instrumental function and the true d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew composite materials from natural hard fibers. 2. Fatigue studies and a novel fatigue degradation modelHector Belmares, Arnoldo Barrera, and Margarita MonjarasCite this: Ind. Eng. Chem. Prod. Res. Dev. 1983, 22, 4, 643–652Publication Date (Print):December 1, 1983Publicati…
Self‐diffusion coefficients of the oxygen ion in single‐crystal Y 2 O 3 were determined by the gas‐solid isotope exchange technique. The results in the range 1100° to 1500°C are described by D=7.3 X 10 ‐6 exp [‐19l(kJ/mol)/RT] cm 2 /s. Comparison of the results with those for oxides with the fluorite‐type structure in…
Separate experiments at 350 degrees C and 500 bars at a rock/fluid ratio of 1/10. Illite, dolomite, and quartz amounting to 67 percent of the original graywacke, were converted to albite and smectite. The rock gained Na and released Ca, K, heavy metals, and CO 2 to solution. In sharp contrast, the reaction of 4 m NaCl…
Reflection spectra have been measured in the spectral region of the second and the third order selective reflections for monodomain cholesterics of various cell thicknesses at various angles of incidence. Thicker cells give rise to higher reflectance at larger angles of incidence. The second order reflection region co…