Materials Literature
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Niobium oxide films are promising cathodic electrochromic materials that in certain aspects can compete with the more frequently studied films. The films reported here were prepared using the sol‐gel route from a precursor. The electrochromic properties were pronounced for crystalline films heat‐treated at 500°C exhib…
A domain model consistent with the measured capacitance–voltage (CV) characteristics of lead zirconate titanate (PZT) capacitors is proposed. Two variants of this model are presented and compared with experimentally measured CV data. The basic model is developed adopting a macroscopic electric field that is spatially…
GTD-43, a polypeptide with 43 amino acid residues, has been designed to fold into a hairpin helix-loop-helix motif that can dimerize to form a four-helix bundle. The mean residue ellipticity is −21000 deg cm 2 dmol - 1, and the magnitude is independent of pH in the interval of 2.4−4.6. The chemical shift dispersion of…
Cerium-doped TiO 2 thin films have been prepared by reactive RF sputtering. At low Ce concentration, X-ray diffraction indicates that the films have the anatase structure. Ce concentrations higher than 1.2 at.% result in an amorphization of the film which remains stable up to 873 K. The TiO 2 electrical properties hav…
A kinetic model is presented, which describes the platinum-catalyzed selective oxidation of methyl α- d -glucopyranoside to sodium methyl α- d -glucuronate with molecular oxygen in the presence of deactivation by overoxidation. Overoxidation is completely reversible and most adequately described by a reversible transf…
Inosine-5'-monophosphate dehydrogenase (IMPDH) is an attractive drug target for the control of parasitic infections. The enzyme catalyzes the oxidation of inosine monophosphate (IMP) to xanthosine monophosphate (XMP), the committed step in de novo guanosine monophosphate (GMP) biosynthesis. We have determined the crys…
Multicomponent oxide phosphors such as Mn-activated CaO–Ga 2 O 3 are demonstrated to be very promising as the thin-film emitting layer for thin-film electroluminescent (TFEL) devices. The EL emission color from CaO–Ga 2 O 3 :Mn TFEL devices changed from green to orange as the CaO content was increased from 0 to 100 mo…
Bicrystals of ZnO with large interfacial areas and controlled misorientations have been prepared by the solid-phase intergrowth method. The structure of three [0001] tilt boundaries with misorientations of less than 1°, 17·8 ± 0·1° and 31·5 ± 0·1° have been studied by high-resolution electron microscopy. The low-angle…
Abstract Rotes Ag 2 SnO 3 wurde erstmals durch Festkörperreaktion von Ag 2 O und frisch bereitetem K 2 Sn(OH) 6 ‐Gel bei 430°C unter einem ständigen Sauerstoffdruck von 350 bar erhalten. Ag 2 SnO 3 zeigt eine eindimensionale inkommensurable Überstruktur entlang [100] mit a ′ = 33,1 Å. Wir berichten hier über die Basis…
Strong, tough, and almost fully dense BN/SiC‐coated Hi‐Nicalon‐fiber‐reinforced celsian‐matrix composites have been fabricated by impregnation of the fiber tows with the matrix slurry, winding on a drum, stacking the prepreg tapes in the desired orientation, and hot pressing. The monoclinic celsian phase in the matrix…
Phase transitions in solid solutions of strontium titanate with titanates of the divalent metals Pb, Ba, and Ca are considered. It is shown that the critical concentration x c in the well-known expression relating the transition temperature to the polar state in SrTiO 3 with the concentration x of divalent metals, T c…
The solution conformation of a peptide LYS(11-36), which corresponds to the beta-sheet region in T4 lysozyme, has been examined in aqueous solution, TFE, and SDS micelles by CD and 1H NMR spectroscopy. Secondary structure predictions suggest some beta-sheet and turn character in aqueous solution but predict a helical…
A chlorine precursor copolymer was synthesized from the monomers 1,4-bis(chloromethyl)-2,5-(dihexyloxy)benzene and the metal complexes [5,15-bis(mesityl)-10,20-bis(4-(chloromethyl)phenyl)porphyrin] in different ratios with potassium tert -butoxide. The precursor copolymers were readily soluble in common organic solven…
The tensile creep behavior of an (Al 2 O 3 ‐SiC) nanocomposite that contains 5 vol% of 0.15 μm SiC particles is examined in air under constant‐load conditions. For a stress level of 100 MPa and in the temperature range of 1200°–1300°C, the SiC reduces the creep rate of Al2O3 by 2–3 orders of magnitude. In contrast to…
This paper gives basic information pertaining to the plasma treatment of wool top considered as an industrially feasible process. The results presented here are based on experience gained over five years with the world's first prototype machine for continuous treatment of wool tops with glow discharges. The machine ca…
The assignments of Raman bands in the spectra of silicate and germanate glasses, including SiO2, GeO2, Rb2Si4O9, NaFe3+Si3O8, anhydrous and hydrous albite (NaAlSi3O8) and anhydrous and deuterated Ge-albite (NaAlGe3O8) and Ge-jadeite (NaAlGe2O6), were re-examined in the light of new information from Raman measurements…
We investigated the order−order and order−disorder transitions in a solution consisting of polystyrene- block -polyisoprene- block -polystyrene copolymer (Vector 4111 having weight-average molecular weights of 26 × 10 3 and 117 × 10 3 for polystyrene and polyisoprene block chains, respectively) and dioctyl phthalate (…
The shape and optical properties of Au nanoparticles electrochemically deposited within the pores of porous alumina membranes have been studied as a function of the temperature to which the Au/alumina composite was heated. Low aspect ratio Au nanoparticles begin as thin skinned particles, essentially flakes of Au with…
We review the mechanism of integrated circuit failure known as “electromigration.” Electromigration is a physical wearout process that operates primarily in the on-chip interconnections of an integrated circuit. It is caused by the currents that run through those interconnections. The first part of the review introduc…
A Knudsen cell mass spectrometric technique was used to study both the neutral and charged species that are in equilibrium in saturated vapor over lutetium trichloride. It was found that in the temperature range between between 885 and 1100 K the vapor is comprised of molecular (LuCl3), and ionic Cl−(LuCl3)n clusters…