Materials Literature
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Sugilite occurs as an essential mineral amounting to 3–8 percent by volume in aegirine syenite from Iwagi Islet, Ehime Prefecture. It is associated with albite, aegirine, pectolite and a Ca-K-Ti silicate (a still to be identified mineral). Sugilite is light brownish yellow, luster vitreous, streak white. Symmetry hexa…
The results of a four-year research and development program specifically directed to the investigation and evaluation of the voltage-dependent phenomena, characteristics, and requirements of dc overhead lines in the +-400 to +-600 kV range are presented. From its inception, the Project was considered investigatory in…
We study the stability of a Poiseuille flow in a planar nematic, with respect to a uniform distortion of the director. We develop a linearized hydrodynamic theory which allows one to characterize the symmetry of the unstable modes. One expects two types of solutions according to the presence or not of a net transverse…
The 0-lattice theory is a geometrical approach to interface structure. The basis of the theory is that interfaces are ordered. The 0-lattice theory is completely general and embodies many of the concepts of the theories of twinning, martensitic crystallography, and the coincidence site lattice, each of which may be re…
Equilibrium vapour pressures of barium sulphate and free surface sublimation pressures of single crystals were both measured for the first time, using torsion–effusion and torsion–Langmuir techniques, respectively. Mass spectrometer measurements showed the principal decomposition reaction to be BaSO4(s)→ BaO(s)+ SO2(g…
The effects of time and temperature of tempering on the resistance to corrosion of α 0·29%C, 13%Cr steel have been investigated. The results are discussed with reference to proposed mechanisms of accelerated corrosion resulting from certain treatments. A mechanism whereby local chromium depletion of the matrix is caus…
The enzyme lactate dehydrogenase (LDH) has been irradiated under various conditions to assess the relative contributions of -H, -OH, H2O2 and -O2- to LDH inactivation, and it is concluded that -OH is the only important inactivating species. Further the effect of the selective free radicals, -(SCN)2-, -Br2- and -I2- on…
Burrowing activity was utilized as a measure of the ability of the hard shell clam (Mercenaria mercenaria) and the Atlantic surf clam (Spisula solidissima) to cope with extremes of temperature and dissolved oxygen. Clams were removed from clean sand substrate and the progress of reburial timed. Experiments were conduc…
Two ‘strapped’ porphyrins, containing a chain of atoms linking two opposite meso-positions have been synthesized; their iron(II) complexes were oxygenated reversibly at low temperatures (–55 °C) and at 25 °C were converted, irreversibly, into µ-oxo dimers.
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…