Materials Literature
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Abstract The mineralogy of partially kaolinized strata interbedded with lignite at the San Miguel mine, Atascosa County, Texas, was investigated by X-ray powder diffraction and optical and scanning electron microscopy. The San Miguel lignite occurs in the lower Jackson Group (late Eocene) of southern Texas. Based on m…
Measurements of transverse rupture strength are reported for AISI M2, AISI M 35, AISI T 15 and ASP 30 produced by conventional ingot metallurgy, sintering of cold pressed powders, and hot rolling of HIP billets. Also reported are the size distributions of undissolved carbides and the effects of hot reduction and auste…
Occupational exposure during BWR refueling and annual maintenance periods is determined by radioactive corrosion products, such as 60Co and 58Codeposited on major components and piping of the primary cooling system. The authors have investigated behavior of radioactive corrosion products, e.g. generation, activation a…
Abstract The plane strain fracture toughness and fracture mechanisms of several tough engineering plastics have been studied and compared with poly(methyl methacrylate) (PMMA), a relatively brittle polymer. The tough polymers all are observed to form a multiple craze zone at the crack tip, which is shown to be the pri…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe generation of methylene from methylene iodide on aluminum surfacesK. Domen and Tung J. ChuangCite this: J. Am. Chem. Soc. 1987, 109, 17, 5288–5289Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https://d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature dependence of ionic association and of molecular relaxation dynamics of lithium hexafluoroarsenate in 2-methyltetrahydrofuranNaoki. Inoue, Meizhen. Xu, and Sergio. PetrucciCite this: J. Phys. Chem. 1987, 91, 17, 4628–4635Publication Date (Print):August 1, 1987Pub…
A high-performance green-electrochromic display has been developed in a system of p-cyanophenylviologen (p-CV) and potassium ferrocyanide in the presence of sodium hypophosphite and potassium chloride. The main difficulty was in the fact that p-CV reacts with potassium ferrocyanide to form a scale-like green precipita…
The orientational relationship between intergrown lamellae of tetragonal (t) BaTiO 3 and monoclinic (m) Ba 6 Ti 17 O 40 was found to be ( 1 1 1 ) t ||(001) m , (001) t ||( 1 0 1 ) m , and [110] t ||[0 1 0] m . On the basis of this relationship a model of a topotactic boundary between these two phases was constructed.
Magnesium anode testing resulted in the determination of a formula that can be used to predict magnesium anode efficiency. Efficiency increases with increasing electrolyte resistivity and increasing anode current density. Anode potentials are made less negative with increasing electrolyte resistivity. Specific ions ha…
A general method is described for the design of single concave grating optical systems. Proper parameter and variable sets are defined, and a straightforward technique leads to a final set of optimized variable values which minimize a merit function based on spectroscopic performance.
Protein phosphatases present in the particulate and soluble fractions of oocytes of the starfish Asterias rubens and Marthasterias glacialis have been classified according to the criteria used for these enzymes from mammalian cells. The major protein phosphatase activity in the particulate fraction had very similar pr…
Specific volumes and thermal pressure coefficients (∂p/∂T)v of 5CB, 7CB, 50CB, and 80CB were measured from temperatures near their crystalline melting points to above their nematic-isotropic transitions. At TNI, volume changes ΔV of 0.52, 0.67, 0.25, and 0.48 cm3 mol−1, respectively, were found. A discontinuity of 0.0…
Abstract Simultaneous chemical polymerization and oxidation of pyrrole have been initiated by organic electron acceptors, 2,3‐dichloro‐5,6‐dicyano‐ p ‐benzoquinone (DDQ) and tetrachloro‐ o ‐benzoquinone(chloranil). The polypyrrole (PPY) complexes so produced are semiconductive and granular in nature. For the PPY–DDQ a…
(111) twins are found frequently in the microstructure of BaTiO 3 ceramics prepared by the mixed‐oxide technique. The processing steps by which the (111) twins are formed are in question. A BaCO 3 ‐TiO 2 powder mixture is milled and then Calcined at 1100°C for 2 h, where BaTiO 3 is formed by the release of CO 2 . Afte…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIonic conductivity in branched polyethylenimine-sodium trifluoromethanesulfonate complexes: comparisons to analogous complexes made with linear polyethylenimineCaroline S. Harris, Mark A. Ratner, and Duward F. ShriverCite this: Macromolecules 1987, 20, 8, 1778–1781Publicatio…
Abstract The synthesis of three cyclic imino ethers containing mesogenic groups attached to the heterocyclic unit through flexible spacers is described. Cationic ring‐opening isomerization polymerization of two of them, i.e., 2‐[4‐(4‐methoxy‐4′‐biphenyloxy)butyl]‐2‐oxazoline (MeOBiph‐4‐Oxz) and 2‐[6‐(4‐methoxy‐4′‐biph…
We analyze the dynamics of a transient pattern formation in the Fr\'eedericksz transition corresponding to a twist geometry. We present a calculation of the time-dependent structure factor based on a dynamical model which incorporates consistently the coupling of the director field with the velocity flow and also the…
Six Twin dimeric compounds having two rigid cores connected by a central spacer group are described. Two types of rigid units, 4-pentyloxyphenyl cinnamates and 4-cyano-4-oxybiphenyl, were employed. The spacer groups were pentamethylene (PM), diethylene oxide (EO) and disiloxane (DS). For each rigid core the nematic-is…
Only a few years ago image simulation of HRTEM images were mostly carried out as low priority jobs on large mainframe computers with images available the next day as overprinted characters on computer paper. Today the same calculation can be carried out on a dedicated workstation in a matter of minutes with output on…