Materials Literature
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Cured silicone modified polyimide (PI) on packaged dice and blanket wafers were dry etched in a ambient under varying conditions in both a production reactive ion etching (RIE) tool in an integrated circuit (IC) clean room environment and in a desktop RIE tool in a laboratory environment. It has been consistently foun…
A description is provided of the anomalous conchiolin deposits which are formed by Pinctada maxima and which are associated with unusual mortalities. Comparisons are made with brown ring disease found in Ruditapes philippinarum and juvenile Crassostrea virginica. In P. maxima, the deposits are not organized into a rin…
Carbon residue after binder burnout was characterized for several nonstoichiometric lead titanate powders. Thermal decomposition of the poly(methyl methacrylate) (PMMA) binder was performed in nitrogen at 600°C. A drastic decrease in carbon retention was obtained in the case of the titanium‐rich samples. The amount of…
Abstract Durch chemischen Transport mit Cl 2 oder TaCl 5 /Cl 2 als Transportmittel wurden ausgehend von entsprechenden Ausgangsbodenkörpern im Temperaturgefälle T 2 → T 1 (z. B. 1000 °C → 980 °C) farblose {braunschwarze}, hexagonale Einkristalle von Th 4 Ta 18 O 53 {U 4 Ta 18 O 53 } mit den Gitterkonstanten a = 6,2554…
The transformation behaviour of Cu-Mn-based high damping alloys aged within a miscibility gap has been studied intensively using transmission electron microscopy (TEM), with particular attention to fine-scale dynamical movements in segregated microstructures, termed ‘flickering’. As ageing proceeds, features appear in…
The equilibrium of an elastic thin plate in contact with a drop of fluid (both surrounded by another fluid), including capillarity (i.e., the thermodynamic properties of the fluid–fluid and solid–fluid surfaces), leads to a variational problem with discontinuities of some derivatives of the elastic displacement of the…
We report x-ray photoemission spectra of poly(methyl methacrylate) (PMMA). XPS spectra were measured with the SSI, SSX-100 model, using monochromated Al Kα x-rays. We present the survey spectrum (binding energy range of 0–1100 eV) and narrow spectra of C 1s and O 1s. The polymer is used as a reference to study the inf…
Changes in the photoluminescence (PL), microstructural morphology and the chemical nature of the surface of porous silicon (PS) when it is attacked with a 1:1 mixture of concentrated hydrofluoric acid and water have been studied. As the PS dissolves, the porous structure is essentially destroyed while the appearance a…
The pyrolysis kinetics of cellulosic uncoated printing and writing paper, which is one of the principal materials contributing to the municipal solid waste (MSW) of Taiwan, was investigated with a thermal gravimetric analysis (TGA) reaction system. The experiments were carried out in a nitrogen environment in the 450–…
The metal-catalyzed Baeyer-Villiger oxidation of cyclohexanone with molecular oxygen (latm) in the presence of benzaldehyde gives δ -caprolactone in high yield. The same oxidation in the absence of metal catalysts is also studied. Additives to the system can improve the reaction highly efficiently.
The synthesis of the 3-pyrrylacetic acid as well as the study of its esterification conditions are described. The new materials thus obtained are electropolymerized.
Chloride (Cl-)-induced pitting corrosion of iron at pH 10.5 and 25°C was examined by conducting quasi-steady-state (potentiostatic) polarization experiments in borate-buffered 0.1 M sodium chloride (NaCl) solutions with buffer concentrations from 0 M to 0.075 M. Values of the film breakdown potential (Eb) were scatter…
The structure of hexamagnesium sulfonyl tetradecahydroxide, Mg 6 SO 2 (OH) 14 , has been determined with an extremely small single-crystal ( ca 0.5 × 100 × 2.5 μ m) using synchrotron radiation [1.00 (1) Å]. The crystal is orthorhombic with space group Ccmm (No. 63), a = 15.895 (1), b = 3.105 (1), c = 13.367 (1) Å, V =…
H. Ray Gamble, Raymond H. Fetterer, Linda S. Mansfield, Developmentally Regulated Zinc Metalloproteinases from Third- and Fourth-Stage Larvae of the Ovine Nematode Haemonchus contortus, The Journal of Parasitology, Vol. 82, No. 2 (Apr., 1996), pp. 197-202
Abstract Ring oxidized green Cerium(IV)diphthalocyanines, [Ce(Pc) 2 ]X (X = (poly)halide, NO 3 - ) are prepared by chemical oxidation of ( n Bu 4 N)[Ce(Pc 2- ) 2 ] with the corresponding halogen in solution or of solid [Ce(Pc 2- ) 2 ] with aqueous HNO 3 Electrochemical oxidation of (nBu 4 N)[Ce(Pc 2- ) 2 ] in solution…
Nickel sulflde powders were precipitated by utilizing the thermal decomposition of thioacetamide in acidic aqueous solutions. Precipitation was induced by a direct reaction between thioacetamide and nickel at 70° and 80°C with thioacetamide concentrations of 0.80 M . Precipitation was induced by reaction of sulfide io…
A new type of nearly homeotropically aligned four-domain liquid crystal display has been developed using nematic liquid crystals with negative dielectric anisotropy. In this display a pixel is divided into four domains which have different and optically compensating molecular alignment properties. This molecular arran…
The crystal structure of vanadocene, bis(π 5 –2,4-cyclopentadien-1-yl)vanadium, Cp 2 V, has been studied at the four temperatures 108, 170, 297 and 357 K by X-ray diffraction in order to elucidate the nature of the Cp-ring disorder and compare the results obtained with similar data for formally isostructural ferrocene…
We have investigated the recently reported discrepancy between theory and a new experiment [Palathingal et al., Phys. Rev. A 51, 2122 (1995)] for single-quantum annihilation of positrons with bound electrons. Fully relativistic calculations of total cross sections for the production and the annihilation of positrons i…
Mussels form byssal threads that can attach tenaciously to wet and irregular surfaces. The byssus consists of a fibrous collagenous core, and at least two types of polyphenolic proteins surround it. One of these proteins, designated Mgfp-1, coats the collagenous core; the other, designated Mgfp-2, is the major compone…