Materials Literature
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We present the results of Monte Carlo simulations on a system of hard ellipsoids of revolution with length-to-breadth ratios a/b = 3, 2·75, 2, 1·25 and b/a = 3, 2·75, 2, 1·25. We identify four distinct phases, viz. isotropic fluid, nematic fluid, ordered solid and plastic solid. The coexistence points of all first ord…
The influence of thickness errors and boundary imperfections on the performance of a multilayer x-ray mirror is discussed and it is shown that both can be obtained separately from a measured reflectivity curve at a short x-ray wavelength. Multilayers have greatly reduced scattering compared to single films, and for th…
Soon after the discovery of x-rays and their property of constructive interference scattering (diffraction) by solids resulting from the ordered array of atoms forming the solids, it was proposed that man-made (synthetic) layered structures might extend the range of utility of this phenomena into spectral domains not…
It is shown that a quartic orientational free energy leads to long-range icosahedral bond-orientational order which, through a coupling with a translational order parameter, stabilizes the icosahedral quasicrystalline phase. The bond-orientational order selects the wave vectors which point into vertices or faces of an…
The epitaxial growth of a Lennard-Jones system is studied as a function of substrate temperature ${T}_{s}$ and deposition rate. For all substrate temperatures the growth is into well-ordered layers. Layers become fully completed at intermediate ${T}_{s}$. At very low ${T}_{s}$ the layers contain defects and voids; how…
1 Vieillissement physique par absorption d'eau 1.1 Hydrophilie d'un polymère en relation avec sa structure 1.2 Plastification par l'eau 1.3 Endommagement par gonflements différentiels 1.4 Autres conséquences physiques de l'absorption d'eau 2 Vieillissement chimique en présence d'ea
X-ray powder diffraction results for various hydrides Tm 6 Mn 23 H x and Er 6 Fe 23 H x are reported and included in an extensive plot of hydride-cell volume V hydride against host-cell volume. All tetragonal hydride phases identified to data are observed to satisfy x>9, V hydride <1.883(5) nm 3 and c 0 >a 0 . It is d…
Abstract Aldonitrones are effective melt stabilizers for polypropylene, the most effective being benzaldonitrones containing a partially hindered 4‐hydroxy group in the aromatic ring. They form nitroxyl radicals in the polymer during processing, and these and the related hydroxylamines are believed to be involved in a…
Soxhlet-type leaching experiments were carried out for 200 days and the leaching solutions analyzed by inductively coupled plasma spectroscopy and atomic absorption spectroscopy. The data of the solution analysis and the results of our previous study on the surface layers revealed the fact that elements in the waste g…
The dual field effect on the relaxation time of the liquid-crystal BDH-E7 has been analyzed and demonstrated experimentally by using static magnetic and pulsed optical fields. The novelty of this effect is in the use of a strong external field to accelerate the molecular relaxation process. An improvement factor on de…
The catastrophic growth of unstable thermoplastic shear following the transition from homogeneous deformation to heterogeneous localized deformation through distributed shear banding is studied through approximate analytic and computational methods. The calculations provide expressions for shear-band widths, spacing,…
L'enthalpimétrie par réaction directe dans les systèmes silicatés n'est pas possible. La méthode de dissolution qu'il faut alors employer engendre une erreur importante vis-à-vis des faibles énergies mises en jeu dans l'effet alcalin mixte ici étudié. Nous montrons cependant que les composés silicatés liquides comport…
Abstract Cotton fabric was crosslinked with five agents, three of which were prepared form formaldehyde and two of which were formaldehyde‐free. The formaldehyde‐free agents produced less bonding between layers in the laminated microstructure of the cotton fiber. One agent, 4,5‐dihydroxy‐1,3‐dimethyl‐2‐imidazolidinone…
Abstract The dilute‐solution behavior of poly(vinyl alcohol) (PVA VTFA ), derived from vinyl trifluoroacetate, in water‐dimethylsulfoxide (DMSO) mixtures was investigated. With solvent mixtures ranging from 10 to 20 vol % DMSO, the relation between the reduced viscosity η sp / C and the polymer concentration C was lin…
In a field experiment in which heavy applications of liquid dairy manure were added annually for 6 yr to a vermiculite-containing corn-cropped sandy clay loam soil (Mountain series), fixation potential and X-ray diffraction analyses were done to determine if fixation of added K + and NH 4 + had occurred and clay miner…
The effects of carbon black type and loading, and variation of base polymer, on a series of polychloroprene rubbers (neoprenes) have been investigated. Two common types of neoprenes, each with a lead oxide cure system, were used. The acoustic responses of these materials were characterized for extensional wave propaga…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(iminomethylenes). 21. Synthesis of copolymers of isocyanides derived from alanylserine and alanylhistidineH. G. J. Visser, R. J. M. Nolte, J. W. Zwikker, and W. DrenthCite this: J. Org. Chem. 1985, 50, 17, 3138–3143Publication Date (Print):August 1, 1985Publication Hist…
Various desalination methods had been used in the past to treat a large collection of archaeological iron objects. In order to establish whether desalination treatments had been effective, the condition of the objects was assessed and the data analyzed using statistical methods. It was found that objects which had bee…
Abstract With the current interest in the use of transition metal-exchanged phyllosilicates as catalysts for novel organic syntheses, investigations into the factors which affect the movement of reactant, product, and solvent molecules into and out of their interlamellar region are of considerable importance. Mixed or…
Temperature dependence of the Faraday effect is investigated for As2S3 fiber at 3.39 microm, obtaining a Verdet constant V of 1.62 x 10(-2) min/cm x G at room temperature and a temperature-dependence term coefficient of 10.67 min x K/cm x G in the experiments. The V value obtained at 25 degrees C is consistent with th…