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Abstract The n.m.r. variable temperature behaviour of the 7‐membered ring in 1,3‐dihydro‐2 H ‐1,5‐benzodiazepin‐2‐one derivatives and in the corresponding 2‐thiones has been investigated. The results indicate that the ring inversion barrier is higher in the thiones and dependent on substituents bonded at N‐1. The acti…
Abstract not Available.
Linear perturbation theory is used to analyze the stability of a moving planar alloy‐oxide interface when oxidation of a binary solid solution alloy leads to growth of a superficial metal conducting oxide scale. The transport equations for metal and oxygen in the alloy and oxide phases are analyzed under limiting appr…
Zirconium(IV) carboxylates, Zr(OOCR)4 where R = Me, Et, CH2Cl2 CHCl2 and CCl3, have been prepared by the reaction of zirconium(IV) chloride and carboxylic acids. The compounds have been characterized by elementary analyses, thermogravimetry and infrared spectral data. The compounds are non-electrolytes in nitrobenzene…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContact vs. pseudocontact contributions to lanthanide-induced shifts in the nuclear magnetic resonance spectra of isoquinoline and of endo-norbornenolOtto A. Gansow, Paul A. Loeffler, Raymond E. Davis, Robert E. Lenkinski, and M. Robert Wilcott IIICite this: J. Am. Chem. Soc…
The production of domains during the application of a magnetic field on a bulk sample of nematic liquid crystal is shown. These domains are created during the process of realignment of the nematic directors and have many similar features to the domains created by electric fields (in the conduction regime). These domai…
The effects which low-temperature electron irradiation have on the photoluminescence from Si provide new information regarding irradiation-induced defects which participate in radiative recombination. Previous identifications of the 0.8–1.0-eV band with the divacancy and the 0.6–0.8-eV band with the Si-G15 (or K) cent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComputation of Multicomponent, Multiphase EquilibriumBoyd George, L. P. Brown, C. H. Farmer, Paul Buthod, and F. S. ManningCite this: Ind. Eng. Chem. Process Des. Dev. 1976, 15, 3, 372–377Publication Date (Print):July 1, 1976Publication History Published online1 May 2002Publ…
Abstract The phenomenon of flow‐induced crystallization was investigated using a linear polyethylene above its normal melting point flowing continuously in a Biconical Rheometer. It was found that the resin crystallized in the superheated state at rates which increased with increasing shear rate and decreasing tempera…
Gamma irradiation was found to release iodine in small amounts from powdered samples of cesium iodide and barium iodide, but not from zirconium iodides. The amount of iodine released was measured with silver foil detectors in sealed capsules that contained the salt. The amount of release was markedly affected by impur…
Following a brief introductory remark on the holographic grating, the possibility of designing concave gratings for a specific application is discussed, giving basic ideas of the grating design, actual design procedures, and feasible ways of improving the existing design methods. As a proof of the usefulness of the de…
The weak-beam technique of electron microscopy has been used to investigate plate-like G.P. zones in aluminium-copper alloys. For aluminium-1-48 and 3-97 wt% copper alloys aged at 80, 100 and 130°C, G.P. (I) zones of about 35 to 100 Å in diameter were observed. In dark-field images, using the (002) reflection with |s|…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterpenetrating Polymer Networks Based on SBR/PS. 2. Influence of Synthetic Detail and Morphology on Mechanical BehaviorA. A. Donatelli, L. H. Sperling, and D. A. ThomasCite this: Macromolecules 1976, 9, 4, 676–680Publication Date (Print):July 1, 1976Publication History Pub…
The magnetomechanical behavior of the splat-cooled amorphous alloy Fe75P15C10 has been studied at audio frequencies by a vibrating-reed technique. The ΔE effect exhibits a maximum value at a magnetization near 0.5MS. Such a maximum has only rarely been observed in the past, but now appears to be a general feature of t…
As a first step toward constructing a general molecular model for cholesteric liquid crystals, we propose here a planar model in which the intermolecular potential is required to contain chiral contributions as a result of symmetry considerations. By means of a mean-field analysis, we identify the microscopic basis fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of N-Vinylcarbazole, N-Vinyl-5H-benzo[b]carbazole, and N-Vinyl-7H-benzo[c]carbazoleKen-ichi Okamoto, Masafumi Yamada, Akira Itaya, Tadashi Kimura, and Shigekazu KusabayashiCite this: Macromolecules 1976, 9, 4, 645–649Publication Date (Print):July 1, 1976Public…
In the envelope of Escherichia coli, is a lipoprotein of molecular weight 7,200 as a major envelope protein. This lipoprotein was previously shown to exist in two different forms in the outer membrane of E. coli: the free form and the boundform, which is covalently linked to the peptidoglycau. The free form of the lip…
The fluorescence spectrum of KY3F10: 1% Eu in powder form was recorded at 77 and 4.2°K between 4600 and 7000 Å, and 89 fluorescence lines arising from levels 5D0, 5D1, 5D2, and probably 5D3 were observed. The spectrum agrees with with a C4v symmetry, and it is possible to determine the irreducible representation of th…
A theory is developed for spin-lattice relaxation in the nematic phase which includes both local and collective motion. It is found that the frequency dependence of the relaxation rate ${T}_{1}^{\ensuremath{-}1}$ depends on the correlation time for the motion at the local molecular level, ${\ensuremath{\tau}}_{c}$. Wh…
Measurements of low-temperature specific heats (2-37 K) are reported for the first time on some common paraelectrics (thallous halides, Pb${\mathrm{F}}_{2}$, KTa${\mathrm{O}}_{3}$), ferroelectrics [BaTi${\mathrm{O}}_{3}$, potassium dihydrogen phosphate or KDP, triglycine sulfate or TGS, LiNb${\mathrm{O}}_{3}$, LiTa${\…