Excess enthalpies for the systems acetonitrile-benzene-tetrachloromethane and acetonitrile-dichloromethane-tetrachloromethane at 298.15 K

Nagata, I., Tamura, K. and Tokuriki, S., 1982. Excess enthalpies for the systems acetonitrile-benzene-tetrachloromethane and acetonitrile-dichloromethane-tetrachloromethane at 298.15 K. Fluid Phase Equilibria, 8: 75-86Excess enthalpies at 298.15 K are reported for the binary mixtures acetonitrile-benzene, acetonitrile-tetrachloromethane, benzene-tetrachloromethane, acetonitrile-dichloromethane and dichloromethane-tetrachloromethane, and for the ternary mixtures acetonitrile-benzene-tetrachloromethane and acetonitrile-dichloromethane-tetrachloromethane. The results are analysed by means of an associated-solution theory which includes two types of self-association for acetonitrile, the formation of binary complexes CH₃CN·C₆H₆, CH₃CN·CH₂Cl₂ and C₆H₆·CCl₄, and a physical-contribution term expressed by the NRTL equation.     

Enhanced scattering from a thin film with one-dimensional disorder

This paper deals with a TE plane wave scattering from a thin film with one-dimensional disorder by means of the stochastic functional approach. The thin film is one-dimensionally inhomogeneous in the horizontal direction with infinite extent, and is homogeneous in the vertical direction with finite thickness. Based on an approximate wavefield representation in terms of a Wiener-Hermite expansion in a preceding paper (Tamura et al., 2004, Waves in Random Media, 14, 435-465), the first- and second-order incoherent scattering cross-sections are presented in explicit forms and scattering properties are discussed. The scattering properties vary entirely with the film thickness. In a case where the thickness is smaller than a few wavelengths in the thin film, enhanced scattering and associated enhanced scattering may appear as sharp peaks or dips on the second-order incoherent scattering distribution if the thin film has guided wave modes. When the thickness becomes sufficiently larger than the wavelength inside the film, a new enhanced scattering phenomenon appears as gentle peaks on the second-order incoherent scattering distribution in four special directions. Such four directions are the directions of forward scattering, specular reflection, backscattering, and the symmetrical direction of forward scattering with respect to the normal of the film surface.The first-order incoherent scattering occurs distinctly in four such directions. Such enhanced scattering is independent of the existence of the guided wave modes inside the thin film, and deeply relates to the structure of the thin film with one-dimensional disorder that has infinite correlation in the vertical direction. For SiC and glass thin films having one-dimensional disorder with a Gaussian correlation and three types of exponential correlation, the first- and second-order incoherent scattering cross-sections are illustrated in figures. The narrow enhanced scattering peaks appear for the glass film in a thin case. The gentle enhanced peaks turn up for both the SiC and glass films in a thick case. Furthermore, the optical theorem is calculated for several cases. It is then found that the error of the optical theorem decreases and the performance of the wavefield is improved by taking into account the second-order incoherent scattering.     

Fine-structure in secondary electron emission from Cu(0 0 1)c(2 × 2)-Cl: Experiment and theory

Normal emission secondary electron spectra excited by photons of energy ?ω = 21.2 eV and by electrons of 100 eV kinetic energy have been measured with high resolution from Cu(0 0 1) and Cu(0 0 1)c(2 × 2)-Cl. Calculations were performed using a “one-step” multiple scattering formalism for the semi-infinite system. The close agreement between experimental and theoretical fine structure reveals the nature of individual features. Our results demonstrate that in general bulk-derived features in the secondary electron fine structure cannot be directly associated with critical points in the band structure.     

Basic study of ℜ-semigroups and their homomorphisms

In this paper we study ?-semigroups from the standpoint of their homomorphisms into the semigroup IR of positive real numbers under addition. Every ?⁺-semigroup S is isomorphic with a subdirect product of a structure group G and a semigroup of positive real numbers. It is determined by G and a positive real valued function cp on G. We also study the semigroup Hom(S,T) of homomorphisms of an ?-semigroup S into another ?-semigroup T. Each element of Hom(S,T) can be described in terms of an element of Hom(S,IR₊) and an element of Hom(S,H) where H is a structure group of T.     

Analyzing powers and cross sections in elastic p-d scattering at 65 MeV

Analyzing powers and differential cross sections for $\text{p}\text{-}\text{d}$ elastic scattering have been measured at 64.8 MeV. The angular distributions cover center-of-mass angles between 8° and 169°. The relative uncertainties of the analyzing power measurement are typically ± 0.005 at c.m. angles less than 80° and are in general ± 0.015 at the remaining angles. The absolute scale of the analyzing power measurement has an uncertainty of ± 0.013. The data are compared with three-body calculations based on the Faddeev theory. In contrast with the differential cross sections, the analyzing powers could not be reproduced without the D-wave nucleon-nucleon interactions.     

Synthesis of (±)-methylenolactocin and (±)-trans cognac lactone

The title compounds were efficeintly synthesized from 3-fuancarboxylic acid via the Birch recuction-elimination.     

Simple determination of forphenicinol in human plasma and erythrocytes by HPLC with native fluorescence detection

A high performance liquid chromatographic method is described for monitoring forphenicinol, a possible therapeutic drug for cancer and muscular dystrophy, in human plasma and erythrocytes. Forphenicinol in the deproteinized samples was separated from interfering biogenic substances on an aminopropyl-bonded silica (Unicil NH2) column within 10 minutes with isocratic elution, and determined with fluorescence detection. The detection limits for forphenicinol in plasma and erythrocytes are 65 pmol (12.8 ng)/ml and 160 pmol (31.5 ng)/ml, respectively, corresponding to 2 pmol each in a 100 microliters injection volume. The method is very simple, and sensitive enough to permit the quantification of forphenicinol in the blood samples from man dosed with forphenicinol.