Materials Literature
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<div class="htmlview paragraph">Our major challenge for future catalyst systems was to develop more thermally stable washcoats for close coupled operating conditions and for engines operating under high speed and load conditions. To design these future emission systems extensive research and development was unde…
An experimental study of the effects of bead-to-bead stepover, wire size, wire feed speed, voltage, flux chromium content, and polarity on dilution and ferrite in single-wire submerged arc cladding of ER309L on mild steel plate is described. Low dilution was found to be promoted by reduced stepover, reduced wire feed…
Describes the growth in industrial usage of GRP (glass fibre reinforced plastic) to control corrosion and, in particular, the use of DERAKANE, a vinyl ester used in GRP. Gives examples of its use in Germany, the UK and the USA. Concludes that the experience with GRP based on epoxy vinyl ester resins applications is ve…
Internal friction measurements were performed on plastically pre-deformed ultrapure nickel single crystals. Bordoni and Niblett-Wilks relaxation was observed. From the activation enthalpy of the Bordoni relaxation, H eff B = (0.19 ± 0.03) eV, the enthalpy of a single kink could be derived as H k = 0.093 eV applying Se…
Commercially available silica gel was derivatized with n-octadecyldimethylchlorosilane to produce inexpensive HPLC reverse-phase stationary support, which was used in separation experiments.
The cadmium complex Cd(CN)2·(18-crown-6) (1) was synthesized and its structure was determined by X-ray crystallography. The cadmium ion in 1 has a hexagonal bipyramidal geometry containing six equatorial oxygen atoms from the crown ether and two axial CN ligands. The NC-Cd-CN ‘rod’ is perfectly linear with an end-to-e…
Addition of lime to increase pH is generally required for soilless media based on acidic organic materials. Media pH may decrease over time as the result of addition of acidic fertilizers. The objectives of this research were to characterize reactions of conventional or finely ground limestone in soilless media and to…
The crystalline phase of a series of random 6/6.9 copolyamides was studied. The crystallization and fusion behavior, crystallography, and morphology were investigated. A decrease in melt crystallization temperature and rate, and an increase in cold crystallization temperature are caused by increasing either monomer co…
The preparation and characterization of the title complex, [Mn(Phen)2Cl2] are reported. The crystal structure determination shows that the two 1,10-phenanthroline ligands and two Cl-atoms form the pyramidally distorted octahedron around Mn(II). The chemically equivalent ligands play a different structural role in this…
<div class="htmlview paragraph">Fluid cavitation corrosion can cause severe damage and problems in many practical applications. A collapsing bubble produces pressure and thermal shock waves, and microjets. These intense local forces will erode material in the proximity of the collapsing bubble. The intensity of…
Article External cooling of a pressurized water reactor vessel during a severe accident / Außenkühlung des Druckgefäßes eines Druckwasserreaktors während eines schweren Störfalls was published on February 1, 1996 in the journal Kerntechnik (volume 61, issue 2-3).
The α → β transformation behavior and the temperature dependence of lattice strain of α‐AgI crystal frozen in an AgI‐based orthoborate glass matrix were investigated by differential scanning calorimetry and x‐ray diffraction in the temperature range from 20 to 180°C. After heating to various temperatures, the glass ma…
Summary Hydrogen-induced cracking (HIC) is a materials- and corrosion-related problem that occurs in surface production systems. Steels used to construct sour-gas production facilities and flowlines may corrode from wet hydrogen sulfide (H2S) gas in the production stream. The corrosion process generates hydrogen that…
Thymidylate synthase (TS), a dimeric enzyme, forms large soluble aggregates at concentrations of urea (3.3-5M), well below that required for complete denaturation, as established by fluorescence and size-exclusion chromatography. In contrast to the wild-type enzyme, an engineered mutant of TS (T155C/E188C/C244T), TSMo…
Abstract Single crystals of strontium danburite, SrB 2 Si 2 O 8 , were found after high-pressure treatment of SrSiO 3 /SiO 2 /Al 2 O 3 mixtures at 40 kbar and 1400°C, obviously formed by an unwanted side reaction with the boron oxide-containing boron nitride capsules used. The crystals are orthorhombic, space group Pn…
Sepiolite (a hydrated magnesium silicate) was investigated as a catalyst for the isomerization of lactose. Factors such as temperature, concentration and time were studied. The main reaction product was lactulose; small amounts of epilactose, galactose, tagatose and 3-deoxypentulose were also formed. Product distribut…
A criterion of ordering was given in an earlier paper for A(B′B′″)O 3 crystals with B′ and B″ ions having a charge difference. It has been extended in this paper to (A′A″)BO 3 crystals and to the cases where the cations have the same valence. The formulae of the effective interaction energy parameter J in (A′A″)BO 3 a…
Low stress mechanical properties of cotton /polyester yams representing random fiber disposition and core-sheath construction are compared to determine the influence of fiber distribution on yam properties. The yams are converted into plain weave fabrics under identical conditions, and fabric properties are compared t…
Abstract Composites based on polypropylene (PP) (homopolymer and impact modified copolymer) and surface modified aluminium hydroxide (Al(OH) 3 ) have been studied using differential scanning calorimetry (DSC) and X‐ray diffraction (XRD). Filler surface modifiers used included 2‐dodecen‐1‐yl succinic anhydride (DDSA) a…
A survey will be given on recent advances in the investigation of semiconductor epilayers, heterostructures and superlattices using reciprocal space mapping techniques based on triple-axis diffractometry. It is shown that X-ray reciprocal space mapping yields quantitative information on strain, strain relaxation, as w…