Materials Literature
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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…
Rare earth perchlorate complexes with the Schiff base 4-N-(4′-antipyrylmethylidene)aminoantipyrine (AA) of the types [Ln(AA)2ClO4](ClO4)2 (where Ln = La, Pr, Nd, Sm and Eu) and [Ln(AA)3](ClO4)3 (where Ln = Gd, Dy, Ho, Er and Y) have been synthesised and characterised. In these complexes AA acts as a terdentate ligand.…
Balsamorhiza sagittata, a species of ethnopharmacological interest in British Columbia, is reported to have antibacterial and antifungal properties. An antibacterial compound isolated from this species was identified as 7,10-epithio-7,9-tridecadiene-3,5,11-triyne-1,2-diol based on the HMQC and HMBC experiments.
The oxidation characteristics of Al and Al–Ta alloy films (500 Å) deposited as a passivation layer on Cu have been examined by depth profiling using Auger electron spectroscopy and X-ray photoelectron spectroscopy. Although alloying between Al and Cu takes place, the Al films prevent the oxidation of Cu up to the oxid…
Mutation of Arg-15, Glu-19, Arg-22, and Thr-27 of porcine liver fructose-1,6-bisphosphatase was carried out by site-directed mutagenesis. These residues are conserved in all known primary sequences of mammalian fructose-1,6-bisphosphatase. On the basis of the crystal structure of the enzyme, Arg-15, Glu-19, and Arg-22…
When a ZnO powder compact is sintered at 1450°C in air, the grains at the surface region of the specimen are observed to grow abnormally. Such abnormal grain growth does not occur when the specimen is sealed in a small cylindrical quartz tube and sintered at the same temperature. The higher rate of densification at th…
The photocontrolled millimeter-wave (MMW) antenna is an alternative approach to the phased array. It offers a high potential to decrease fabrication cost. We describe a new MMW scanning antenna controlled by light. The basic antenna element is a semiconductor plate containing a photoinduced plasma grating (PIPG). By c…