Materials Literature
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The rhombohedral-rhombohedral transition in PbZrxTi1-xO3 is found to be of first order. Calculations are given of the tilt angle of the oxygen octahedra about [111] together with the octahedron strain. Coupling between these two quantities is found to account for the nature of the phase transition. In addition, an exp…
Abstract The crystal of (NH4)4S2Mo5O21·3H2O contains a discrete polyanion, S2Mo5O214−, formed by reactions in an aqueous solution: 5Mo7O246−+14SO2+2H+\ightleftarrows7S2Mo5O214−+H2O or 5MoO42−+2SO2+6H+\ightleftarrowsS2Mo5O214−+3H2O It is orthorhombic, with the space group Pbcn and with a=15.096(9), b=13.375(8), c=23.73…
Our objective in this book and in subsequent volumes of the Uniscience Series on Water Pollution Control Technology, is to provide a reference manual for design engineers, planners, and managers in industry and government. This is particularly important in the present critical period for implementation of water pollut…
In order to clarify the deformation and fracture behaviours of cementite, observations by an optical microscope and a scanning electron microscope were made on the slip lines and fracture surfaces which took place around Vickers hardness indenters pressed on the surface of large cementite grain in white pig iron.Altho…
A cryogenic refrigeration cycle based on the (linear) electrocaloric effect in single crystals of lithium sulfate monohydrate (LSM) is proposed. The phenomenology of the electrocaloric effect is developed and expressions for the low-temperature heat capacity and pyroelectric coefficient are derived. A Carnot cycle con…
TRIGA fuel was developed around the concept of inherent safety. A core composition was sought that had a large prompt negative temperature coefficient of reactivity such that if all the available excess reactivity were suddenly inserted into the core, the resulting fuel temperature would automatically cause the power…
A novel concept for the design of inclusion compounds, which has lead to the discovery of a series of hosts, is described.
Specimens of LixNa1-xNbO3 where 0.02 ≤ x ≤ 0.15 have been hot pressed to densities greater than 99% of the theoretical density and their dielectric and electromechanical properties measured as functions of density and composition. An enhancement of electromechanical properties has been observed for composition with x…
This work discusses experimentally the hydrodynamic instabilities of an oriented nematic film contained in a plane Poiseuille flow cell such that the director is initially perpendicular to the velocity and velocity gradient. Homogeneous instabilities having a uniform distortion in the plane of the boundary plates are…
Purification was conducted on polyvinyl alcohol (PVA) degrading enzyme produced and secreted into the culture medium by Pseudomonas O-3 strain. The enzyme was found to separate into several fractions by ion-exchange chromatography and gel filtration. Among these fractions, a fraction adsorbed to SP-Sephadex C-50 at pH…
Fiber-reinforced epoxy laminates were exposed to several combinations of temperature and relative humidity. The purpose was to determine rates and extent of moisture absorption. Diffusion rates varied with temperature, and equilibrium moisture contents varied with relative humidity. Data analysis provided values for t…
Abstract The crystal structure of 12,13‐dibromopseurotin has been determined by single crystal X‐ray analysis. The crystals belong to space group P2 1 with a = 16.75, b = 9.63, c = 7.42 Å, β 95.9°, Z = 2. The structure was solved by the heavy atom technique and refined to R = 0.062 with 819 significant reflexions for…
Переходы спиновой переориентации в редкоземельных магнетиках, Белов К.П., Звездин А.К., Кадомцева А.М., Левитин Р.З.
Linear (SDS) and radial (SD)x block copolymers of styrene (S) and dienes (D=butadiene or isoprene), varying in composition and molecular weight, were formulated as pressure sensitive adhesives. The morphology of these compositions was determined by electron microscopy of ultra-thin sections and dynamic viscoelastic me…
Potentiometrically determined formation constants are reported for cadmium(II), lead(II), and zinc(II) with ethylenediaminetetra-acetic acid, 1,2,di(2-aminoethoxy)ethanetetra-acetic acid, glutathione, cysteine, and D-penicillamine at 25 °C, I= 3.00M(NaClO4). Computer-simulated models of blood plasma conditions were us…
Statistical mechanical models used to treat mixtures of random-coiling polymer chains with solvents invariably lead to a partition function that can be separated into a factor for the intramolecular configurations of the chains and another factor for mixing with solvent. It follows that the average configuration of a…
Administration of N-methyl-1,6-dihydropyridine-2-carbaldoxime hydrochloride, the pro-drug form of 2-PAM, resulted in an average of 13-fold increase in the amount of 2-PAM delivered into the brain of mice as compared to the administration of 2-PAM. The pro-drug which crossed the BBB resulted in a dramatic increase in t…
Observations by transmission electron microscopy are reported on the processes involved in polymer crystal growth during annealing. The observations suggest that crystal growth occurs by two processes. One process involves the melting of those regions of the crystals in which the melting point is lower than the anneal…
The nucleation of nickel ammonium sulphate hexahydrate from aqueous solution has been studied by two different methods which involved measuring (a) the maximum allowable undercooling (the metastable zone width) and (b) the induction period before the onset of visible nucleation.Three different nucleation mechanisms we…
Raman scattering from mixed ordered and disordered crystals with perovskite structure has been investigated. In the paraelectric phase of the ordered crystal first-order lines were observed with symmetry properties forbidden for an ideal perovskite structure. Also, Raman line in the high frequency region is attributed…