Materials Literature
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Summary • The chemistry, crystallography and ultrastructure of intracellular calcium oxalate deposits in the angiosperm, Dracaena sanderiana are reported here. • Crystalline deposits extracted from mature leaves and leaf primordia of D. sanderiana were studied by scanning electron microscopy and X‐ray powder diffracto…
The influence of the chromium content and of the volume fraction of primary carbides on the thermal oxidation behaviour of spin cast high speed steels and semi-high speed steels used for the production of hot mill rolls was studied at 700°C. Oxidation nucleates at the carbide–matrix interface and carbides have a highe…
The novel complex precursor Eu(hfa)3·monoglyme and the analogous Eu(hfa)3·diglyme [Hhfa = 1,1,1,5,5,5-hexafluoroacetylacetone, monoglyme = CH3OCH2CH2OCH3, diglyme = CH3O(CH2CH2O)2CH3] have been synthesized in a single step reaction and characterized by elemental analysis, mass spectrometry, and IR and Raman spectrosco…
Abstract It was found that the stability of organogel of methyl-4, 6-O-benzylidene-α-d-glucopyranoside (1) is sensitively affected by a minute amount of concomitant water: the maximum stability is observed at [H2O]/[1] = 1.0. The effect of water molecules on the organogel stability is well understood in relation to it…
Abstract To characterize the evolution of dioctahedral interstratified clay minerals in the Golden Cross epithermal deposit, New Zealand, hydrothermally altered volcanic rocks containing the sequence smectite through illite-smectite (I-S) to muscovite were examined by optical microscopy, X-ray diffraction (XRD), scann…
The structure of the tryptophan synthase alpha-subunit from Pyrococcus furiosus was determined by x-ray analysis at 2.0-A resolution, and its stability was examined by differential scanning calorimetry. Although the structure of the tryptophan synthase alpha(2)beta(2) complex from Salmonella typhimurium has been alrea…
The ligand-assisted templating method for the production of mesoporous Ta 2 O 5 was improved by the removal of noncoordinating alkylamine surfactant before aging. The improved method increased the uniformity of the porous structure and the particle size. The immediate precipitation after the hydrolysis of the alkylami…
Raman and optical experiments have been performed on a lead zinc niobate [Pb(Zn1/3Nb2/3)O3 or PZN] single crystal oriented along (111) under zero-field cooling, and zero-field heating after field cooling conditions. At high temperature, the Raman spectra originate from a phonon–polarization coupling whose selection ru…
Nanostructured coatings on metals, plastics, and textiles have numerous applications, for example, as antifogging and self-cleaning coatings as well as protective coatings against corrosion, heat, or wear. Here the preparation at low temperature of dense nanostructured tetragonal ZrO2 coatings via a modified emulsion…
Considers the effect of low temperatures on the characteristics of lead‐free alloys based upon tin, which is the most popular basis for the new alloys.
The study of perovskite manganites La0.7Sr0.3Mn1—xCrxO3 has been carried out. The structure, magnetic and electrical properties of La0.7Sr0.3Mn1—xCrxO3 manganites are strongly dependent on the doping level x. The little difference between the ionic radii of Cr3+ and Mn3+ causes no change in the structure, the structur…
The paper presents a new methodology for calculating magnetizing inrush currents. Similarly to the seminal work of Rajakovic and Semlyen, all the calculations are conducted in the frequency domain, hence, circumventing the many problems encountered when time domain simulations are used to solve this problem. Unlike th…
The structure and microstructure of laser-deposited La1−xSr x MnO3(x ≈ 0.1) films on SrTiO3(100) single-crystal substrates have been studied by means of electron diffraction and high-resolution transmission electron microscopy. The film–substrate interfaces are found to be perfectly coherent and in particular to be fr…
The primary candidate for the barrier/etch stop layer in damascene process is silicon nitride. However, silicon nitride has a high dielectric constant. To reduce the effective dielectric constant in the copper damascene structure, silicon carbide, which is prepared by plasma enhanced chemical vapor deposition (PECVD)…
The microstructures of BME‐X7R ceramics have been investigated by imaging and analytical TEM. By varying the sintering conditions (pressing, sintering temperature and atmosphere), the microstructure changes drastically, and dislocation loops can be observed. These defects most probably are caused by an ordering of oxy…
Abstract We report a visible light-induced reversible photomagnetism in CuII2[MoIV(CN)8]·8H2O (1). By the irradiation with a 480-nm laser light, the compound 1 showed a spontaneous magnetization with a magnetic ordering temperature (Tc) of 30 K. Conversely, the magnetization and Tc values were reduced by the irradiati…
Pro-phenoloxidase (proPO) in insects is activated through the action of a protease cascade triggered by minute amounts of microbial cell wall components. It is an important molecule for the defense against invading microorganisms and for the repair of wounds. In the accompanying paper (Asano, T., and Ashida, M. (2001)…
We consider the problem of determining optimal wire widths for a power or ground network, subject to limits on wire widths, voltage drops, total wire area, current density, and power dissipation. To account for the variation of the current demand, we model it as a random vector with known statistics, possibly includin…
A long-standing puzzle in heterogeneous catalysis, CO oxidation on a Ru(0001) surface under high oxygen pressure, was clarified recently by Over et al. [Science 287, 1474 (2000)], who obtained experimental evidence that the active phase is RuO2(110) when the reaction is operated at an elevated temperature. To find mic…
Reliable methods of patterning thin zeolite films on various supports, such as the versatile photochemical method introduced here, will lead to a breakthrough in applications, e.g., as combinatorial catalysts. The Figure shows an SEM image of a glass plate patterned directly with a continuous film of the zeolite ZSM-5…