Using solubility parameters in cosmetics formulation
Dans cet article sont donnes 150 parametres de solubilite de matieres cosmetiques ainsi que les methodes pour leur calcul et un programme d'ordinateur
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Temperature-concentration behaviour of the order parameter in the nematic phases of a lyotropic liquid crystal
Résumé. 2014 Les variations en fonction de la température des invariants du paramètre d’ordre sont mesurées dans les phases nématiques uniaxes et biaxes de différents mélanges de laurate de potassium, 1-decanol, D2O. Elles montrent que les transitions de phase nématique uniaxe-biaxe sont du second ordre et de champ mo…
Macromolecular structure and liquid crystallinity
The relationship between low-molar-mass or monomeric liquid crystals and polymeric liquid crystals is explored by examining the historical development of experimental and theoretical aspects of the latter materials. Polymeric liquid crystals are initially contrasted with conventional, non-mesogenic, flexible polymer c…
Copper(I) iodide complexes of novel structure: [Cu4I6][Cu8I13]K7(12-crown-4)6, [Cu4I6]K2(15-crown-5)2, and [Cu3I4]K(dibenzo-24-crown-8)
Aqueuous solutions of copper(I) iodide, potassium iodide, and the crown ether from unexpectedly different and novel structure: [Cu4I6][Cu8I13]K7(12-crown-4)6 with two different clusters per asymmetric, unit and polymeric modifications, [Cu4I6]K2(15-crown-5)2, and [Cu3I4]K(dibenzo-24-crown-8) depending upon identity of…
Hydrogen attack of pressure-vessel steels
Hydrogen attack (HA) is a degradation process occurring in steel exposed to hot, high-pressure hydrogen. It is caused by the nucleation, growth, and ultimate link-up into fissures of small methane bubbles – primarily on grain boundaries. The location and growth kinetics of the submicrometre bubbles during the incubati…
Röntgen‐Weitwinkeluntersuchungen zur übermolekularen Struktur beim Cellulose‐I‐II‐Phasenübergang
Abstract In Abhängigkeit von der durch Natronlaugenbehandlung hervorgerufenen Gitterumwandlung werden Veränderungen der übermolekularen Struktur von Linters‐Cellulose durch geeignete Parameter (Kristallinitätsgrad, Ordnung und Größe der kristallinen Bereiche) charakterisiert. Die Anwendung des Verfahrens nach Ruland‐V…
I.r. spectra of hydrogen adsorbed on ZrO2
I.r. bands due to dissociative adsorption of hydrogen onto ZrO2 at room temperature were observed by Fourier transform i.r. spectroscopy at 3780 and 3668 cm–1 for ZrOH and at 1562 and 1371 cm–1 for ZrH and ZrHZr, respectively.
Tissue‐ and Stage‐Specific Expression of Sericin Genes in the Middle Silk Gland of Bombyx mori
Sericin gene expression in the middle silk glands during Bombyx mori larval development was analyzed using probes from a genomic DNA clone for 10.5 kb sericin mRNA. The 10.5 kb mRNA, the most abundant in the fifth instar, is not detected in the third feeding, fourth feeding and fourth moulting stages. It becomes detec…
Polyoxo anion-supported organoactinides: the [(C5H5)3U(MW5O19)2]5- anions (M = Nb, Ta) and their thorium analogs [(C5H5)3Th(MW5O19)2]5-
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxo anion-supported organoactinides: the [(C5H5)3U(MW5O19)2]5- anions (M = Nb, Ta) and their thorium analogs [(C5H5)3Th(MW5O19)2]5-V. W. Day, W. G. Klemperer, and D. J. MaltbieCite this: Organometallics 1985, 4, 1, 104–111Publication Date (Print):January 1, 1985Publicati…
Structure and Properties of an Integrated 3-D Fabric for Structural Composites
Based on experimental observations, a theoretical framework has been established to quantify the geometry of a three-dimensional braided fabric. Predictions of the strength of the fabric and composite were made using a geometric model.
Influence of hydrostatic pressure on pitting of aluminium in sea water
The effect of hydrostatic pressure on the corrosion of aluminium in sea water oj pH 8·2 containing 7ppm dissolved oxygen has been investigated at 20°C. On increasing the pressure from 1 to 300 atm, the corrosion rate increased, an effect attributable to an increase in the rate of the anodic reaction while the cathodic…
The Cu2Sb and related structures
Abstract It is observed that neither inspection of z values, consideration of near-neighbour coordination, nor chemical considerations show in all cases which atom occupies site 2 ( c I ) and which site 2 ( c II ) of the Cu 2 Sb tP 6 structure. Calculation of the Wirkungsbereiche by the Dirichlet construction shows in…
Development of Nonionic Contrast Media
In this brief history, the author reviews the observations that led to his developing a nonionic contrast medium. Current knowledge suggested that if a water-soluble medium could be made isotonic to human plasma, it would cause less pain and toxicity than the ionic media then in use. The principles and design of such…
Charging Dynamics of Dielectrics Irradiated by Low Energy Electrons
A recent study by Gross et al. showed the possibility of positive charging of dielectric materials by low energy electron irradiation. In this paper we model the charging process allowing us to predict the voltage builtup or decay and the corresponding charging currents under various initial potential conditions of th…
Nucleotide sequence of theBacillus subtilisxylose isomerase gene: extensive homology between theBacillusandEscherichia colienzyme
The xylose isomerase gene from Bacillus subtilis was cloned from a genomic BamH1 library by complementation of an isomerase defective Escherichia coli strain as previously described. The ATG initiation codon is preceded by a Shine-Dalgarno sequence and two hexamers being characteristic for the promoter region of Bacil…
Crystal structure study of Opsanus tau parvalbumin by multiwavelength anomalous diffraction
The crystal structure of a small calcium-binding protein, the parvalbumin IIIf from Opsanus tau in which Tb was substituted for Ca, has been analysed by multiwavelength anomalous diffraction. Data at a resolution of 2.3 A were collected at three wavelengths near the L3 absorption edge of Tb (1.645-1.650 A), using the…
Polydispersity and the fluid-crystalline phase transition
A « critical » degree of polydispersity is postulated beyond which liquid and crystalline states merge. For a system with a triangular particle-size distribution, the disappearance of the melting transition is estimated to occur at levels of just less than 30 % polydispersity.
The crystal structure of katoite and implications within the hydrogrossular group of minerals
La structure cristalline de la katoite [Ca3Al2(SiO4 (OH)8 ; a = 12,38 Å ; Z = 8 ; groupe spatial Ia3d] a été affinée jusqu'à R = 0,024. Si on compare les résultats de cet affinement avec ceux des termes de la série Ca3Al2(SiO4)3 — Ca3Al2(OH)12 (grossulaire, plazolite, composé synthétique sans silicium), on trouve un b…
Failure mechanics of composites
I. Micromechanics of Failure of Reinforced Plastics (A.M. Skudra). II. Strength (Failure) Theories and their Experimental Correlation (R.E. Rowlands). III. Dynamics of Composites with Cracks (G.C. Sih). IV. The Influence of Time and Temperature on the Reinforced Plastic Strength (J.V. Suvorova). V. Methods of Static T…
The Effect of Pollutants and Bacterial Microfouling on the Corrosion of Copper Base Alloys in Seawater
The effects of seawater contaminants such as ammonium and sulfide ions and trimethylamine on the corrosion behavior of copper base alloys have been studied. Sulfide contamination causes a long-term change in the surface properties of the passive film formed on these alloys in uncontaminated seawater. The kinetics of o…