Diffusivity Summary of B, Ga, P, As, and Sb in SiO[sub 2]
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Stress-induced twinning and phase transformations in polyethylene single crystals
A detailed study has been made of the deformation modes which operate in polyethylene single crystals when drawn on a Mylar substrate. The orientation relationships associated with the stress-induced twinning and monoclinic phase transformations have been determined by electron diffraction and compared with prediction…
The weak-beam technique applied to superlattice dislocations in iron-aluminium alloys
The weak-beam technique of electron microscopy (Cockayne, Ray and Whelan 1969) has been used to image the fourfold dissociation of superlattice dislocations in a DO3-ordered Fe-26 at.% Al alloy. Values of 77±12 and 85±16 erg cm-2 have been obtained for the first and second nearest-neighbour antiphase boundary energies…
Systematics of Core-Electron Exchange Splitting in3d-Group Transition-Metal Compounds
Exchange splittings of $3s$ electrons in $3d$-group transition-metal compounds have been obtained by x-ray photoemission spectroscopy. The data for the difluorides exhibit the expected dependence on $d$-shell spin and $s$-electron binding energy, and yield a $3s$ splitting of 2.6 eV/spin. Data on a series of manganese…
Membrane Lipids in Senescing Green Tissues2
At a late stage in sensescence cucumber cotuledons lose fresh weight rapidly; at the same time there is an increase in apparent free space and large quantities of electrolyte leak out when discs of cotyledon tissue are floated on water. It is concluded that tonoplast and plasma membrane become leaky at this time. Phos…
Morphology and Crystallography of β′ Martensite in TiNi Alloys
Martensitic transfromation in TiNi alloys of the near-equiatomic composition has been studied by utilizing electron microscopy and diffraction under various thermal treatments. It has been observed that the martensitic transformation is associated with the variants of the product. Two orientations of the martensitic p…
The Homogeneous Alignment of Liquid Crystal Layers
The usual way to align a liquid crystal layer homogeneously is rubbing the substrate, wherby micro-grooves are produced. We investigated the orienting influence of micro-grooves of variable density using different substrate materials and different liquid crystals. Some theoretical considerations concerning the alignin…
Synthesis and Mesomorphic Properties of Phenyl 4-Benzolyloxybenzoate Derivatives
A series of liquid crystalline materials comprising substituted phenyl 4-benzoylioxybenzoates were prepared. These compounds may be viewed as derivatives of the unsymmetrical molecule, p-hydroxybenzoic acid. The mesomorphic properties of these new compounds were compared with the more symmetrical analogs derived from…
Suboxide der Metalle Rubidium und Cäsium
Abstract Die metallreichen Oxide (mit 0 < 0/M < 0,5) von Rb mid Cs werden mit speziell dafür entwickelten präparativen, thermoanalytischen und röntgeno‐graphischen Verfahren untersucht. – Die bislang erhaltenen extrem luftempfindlichen Verbindungen besitzen die Zusammensetzungen Rb 6 O, Rb 9 O 2 , Cs 7 O und Cs…
Heat Capacity of Vanadium Oxides at Low Temperature
The electronic contribution to the heat capacity of ${\mathrm{V}}_{1.97}$${\mathrm{O}}_{3}$, ${\mathrm{V}}_{7}$${\mathrm{O}}_{13}$, and ${\mathrm{V}}_{\mathrm{O}.86}$${\mathrm{W}}_{0.14}$${\mathrm{O}}_{2}$ is very large, with $\ensuremath{\gamma}=(130\ifmmode\pm\else\textpm\fi{}3), (80\ifmmode\pm\else\textpm\fi{}5), \…
Heat Capacity of N-(o-Hydroxy-p-Methoxybenzylidene)-p-Butylaniline: A Glassy Nematic Liquid Crystal
The heat capacity of N-(2-hydroxy-4-methoxybenzylildene)-4′-butylaniline(2,4-OHMBBA) with a purity of 99.393 mole % was measured between 13 and 375 K. The Melting point T m was 314.30 K, and the enthalpy and the entropy of fusion were 22.405 kJ mol−1 and 71.425 J K−1 mol−1, respectively. The temperature of transition…
Crystal structure of the radical-cation radical-anion salt from 2,2′-bi-1,3-dithiole and 7,7,8,8-tetracyanoquinodimethane
The three-dimensional structure of the radical-cation radical-anion salt from 2,2′-bi-1,3-dithiole (1) and 7,7,8,8-tetracyanoquinodimethane (2) has been determined by X-ray diffraction methods; the structure is composed of segregated columnar stacks of cations and anions.
Purification and Characterization of Glycine N-Methyltransferase
Abstract Glycine N-methyltransferase, an enzyme which methylates glycine in the N-position to yield sarcosine, has been purified to homogeneity from rabbit liver and partially characterized. The enzyme has a molecular weight of 123,500 as determined by sedimentation equilibrium centrifugation and consists of 3 to 4 no…
Walls in Nematics
At the Freedericks transition of a nematic slab, the molecules can rotate by two different ways, giving rise to adjacent domains separated by a wall. We present observations on the structure and dynamics of these walls at magnetic fields above the transition. The local distortion through the wall agrees with theoretic…
Twisted Smectic C Phase: Unique Optical Properties
Single-domain samples of cholesteric liquid crystals and of the recently reported twisted smectic C phase may have identical optical properties for light incident in the direction of the axis of twist. A single Bragg-reflection band exists for either type of liquid crystal in that case. However, with obliquely inciden…
The meso-reactivity of porphyrins and related compounds. Part VI. Oxidative cleavage of the haem system. The four isomeric biliverdins of the IX series
The oxidative cleavage of haemin in aqueous pyridine under various conditions (ascorbic acid–oxygen; hydrazine–oxygen; and ascorbic acid–hydrogen peroxide) gives four isomeric biliverdins of the IX series which have been isolated (from a much improved ascorbic acid–oxygen reaction) as their crystalline dimethyl esters…
Generalized Correlation for Fugacity Coefficients in Mixtures at Moderate Pressures. Application of Chemical Theory of Vapor Imperfections
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneralized Correlation for Fugacity Coefficients in Mixtures at Moderate Pressures. Application of Chemical Theory of Vapor ImperfectionsK. -H. Nothnagel, D. S. Abrams, and J. M. PrausnitzCite this: Ind. Eng. Chem. Process Des. Dev. 1973, 12, 1, 25–35Publication Date (Print…
Molybdenum‐catalysed epoxidation of olefins with alkyl hydroperoxides I. Kinetic and product studies
Abstract In the homogeneous molybdenum‐catalysed epoxidation of olefins by tert ‐alkyl hydroperoxides two competing processes, epoxidation and hydroperoxide decomposition, have been delineated. Hydroperoxide decomposition involves free‐radical reactions initiated by electron‐transfer reactions of Mo(V) and Mo(VI) comp…
Confrontation of the BCF theory and computer simulation experiments with measured (R, σ) curves
Abstract A brief summary of crystal growth models – the surface diffusion model of Burton, Cabrera and Frank and computer simulation models – is given and these models are confronted with measured ( R , σ) curves. It was found that the most ( R , σ) curves measured so far can be fitted by BCF curves with 10 −2 ≲ σ 1 ≲…
Crystal Structure and Internal Twins of the Ni-36.8 at% Al Martensite
Crystal structure and lattice defects of the Ni-36.8 at% Al martensite have been investigated mainly by transmission electron microscopy. A structure of the martensite determined in the present work has a normal Ll0 type (CuAu I type) structure which is different from a modified Ll0 type (not CuAu I type) structure su…