Materials Literature
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The angular distributions of Cu particles sputtered from a cylindrical (post) magnetron were measured in a pinhole arrangement at various working gas pressures. The differentially pumped pinhole camera—described in a previous article—allows measurements in a pressure range up to 10 Pa and samples the three-dimensional…
Abstract The viscoelastic behavior of acrylonitrile‐butadiene‐styrene (ABS) terpolymers is studied in the molten state. First, the behavior of the styrene‐acrylonitrile (SAN) matrix is determined. Then, the effect of the degree of grafting on ABS rheological properties is emphasized. A critical degree of grafting (DGc…
Abstract A scanning electron microscope (SEM) can be used to measure the dimensions of the microlithographic features of integrated circuits. However, without a good model of the electron‐beam/specimen interaction, accurate edge location cannot be obtained. A Monte Carlo code has been developed to model the interactio…
Abstract Isotactic polypropylene (PP) with MFIs of 0.43 to 44.5 g/10 min were added with 0 to 10 ppm of γ-quinacridone, a β-crystal nucleator of PP. Flexural test specimens were injection-molded from the PPs at constant molding conditions and the structures and properties have been studied. 1) The crystallization temp…
Abstract The reversible interconversion of dihydroazulene (DHA) and vinylheptafulvene (VHF) can be utilized to switch a number of physical properties. This communication reports on a fluorescent switch. By a multistep sequence involving an [8 + 2] cycloaddition route 9‐anthracenyl‐1,4‐phenylene was covalently attached…
A new method of explicit description of n-dimensional polytopes generated by reflections of a single point (D-polytopes) or a face of maximal dimension (V-polytopes) is used to provide a comprehensive uniform description of all such polytopes in dimensions three and four. In addition a class of six-dimensional polytop…
Faraday effect measurement has been carried out for 30Tb 2 O 3 ·70B 2 O 3 glass at room temperature. The magnitude of the Verdet constant is 0.838 min/cm·Oe at the wavelength of 450 nm. This value is large compared with those reported for other glasses containing trivalent rare-earth ions. The wavelength dependence of…
1H-NMR and circular dichroism studies have been carried out on osteocalcin, a 49-residue, calcium-binding protein, the sequence of which contains a disulphide bridge, a proline-rich segment and three gamma-carboxyglutamic acid (Gla) residues. These latter residues have been proposed to lie on one face of an alpha heli…
The susceptibility of alloy 600 (UNS N06600) to stress corrosion cracking (SCC) in hydrogenated high-temperature water was studied as a function of the degree of cold work (CW) of the alloy and the temperature of the solution. Cracks did not nucleate in smooth specimens during constant extension rate testing (CERT). H…
Various pollutants are often introduced in seawater by wet and dry deposition and by improper dumping of municipal wastewater. These pollutants often affect the corrosivity of seawater on copper‐based alloys which might be thought to be resistant in this environment and do not receive sufficient research efforts. In t…
This paper describes the first successful full-matrix least-squares (FMLS) refinement of a protein structure. The example used is crambin which is a small hydrophobic protein (4.7 kDa, 46 residues). It proves the feasibility of refining such large molecules by this classic method, routinely applied to small molecules.…
Abstract The influence of surface roughness on total as well as angle‐dependent signal electron intensities has been studied by means of an effective and simple theoretical model. It was found that the influence of surface roughness may be accounted for in the usual formalism for AES/XPS by using an effective depth di…
Effects of substrate pre-treatment and O 2 partial pressure on the epitaxial growth of sputter-deposited BaTiO 3 films on (100)MgO have been studied. When the film thickness is 20 nm, significant differences in the surface crystallinity and morphology of the films are produced by HCl etching of the substrate surface.…
Filling of the pore network of porous silicon layers with Ge and Si has been demonstrated using a chemical vapor deposition (CVD) technique. It is shown that at low growth rate the species are deposited throughout the whole layer which can be completely filled. At high growth rate, the deposition takes place mainly on…
There are many examples in macromolecular crystallography where interest focuses on the differences between a previously determined 'native' structure and a nearly isomorphous 'variant'. In such cases, a useful approach to atomic refinement of the variant structure is through weighted least-squares minimization of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of diaryl sapphyrins prepared under Lindsey-type conditionsJonathan L. Sessler, Jerzy Lisowski, Kevin A. Boudreaux, Vincent Lynch, John Barry, and Thomas J. KodadekCite this: J. Org. Chem. 1995, 60, 18, 5975–5978Publication Date (Print):Septemb…
Metal-semiconductor field-effect transistors (MESFETs) have been fabricated using the p-type surface-conductive layer of undoped homoepitaxial diamond film on the surface. The layers have been employed as the channel of MESFETs. Since the surface-conductive layer is ultrathin, the depletion region has already closed t…
Abstract Solid state C-13 NMR has been used to compare the chemistry of accelerated vulcanization of natural rubber using N- t -butyl-2-benzothiazole sulfenamide in the presence and absence of carbon black. The carbon black filler has an influence on the vulcanization chemistry in addition to its accepted role in rein…
The scattering from crystals has two components, Bragg and diffuse. In the case of disordered crystalline materials, or those at high temperature, the latter contribution is considerable and contains a great deal of information about any static or thermal disorder in the system. However, interpretation of this diffuse…
Most electrooptic effects in liquid crystals require a uniform orientation of the director at the glass substrates. A new method to produce suitable alignment layers is based on the creation of anisotropic polymer films by photopolymerization with linearly polarized light. In the present paper we report on measurement…