Materials Literature
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Molecular dynamic simulations with quantum correction were performed on an alumina-magnesia system. First, interatomic potential parameters were determined empirically for alumina, magnesia and spinel so as to reproduce the lattice constants at 300K and higher temperatures. Then, the thermal expansivity, specific heat…
Dielectric, pyroelectric current and X-ray diffraction studies have been performed on a ceramic of composition Ba0.92Ca0.08(Ti0.75Zr0.25)O3 belonging to the BaTiO3–BaZrO3–CaTiO3 ternary diagram. A spontaneous classical ferroelectric–relaxor transition was evidenced at T = 210 K. Such behaviour has been reported previo…
Strained cis,cis,cis,trans-tribenzo[5.5.5.6]fenestranes are accessible in good yield by two-fold cyclodehydration of cis-2,6-diphenylspiro[cyclohexane-1,2′-indane]-1′,3′-diols and the particularly high acidity of their ‘inverted’ benzylic bridgehead C–H bonds, causing facile epimerization to the more stable all-cis-tr…
Voltage distribution along a semiconducting glaze insulator string was calculated based on an equivalent circuit. The impedance effect of the insulator unit on voltage and temperature distributions along the insulator string were also examined by calculation. The calculated results agreed well with experimental ones o…
The series of liquid crystalline 4-[(4′-decyloxybiphenyl-4-yl)oxycarbonyl]phthalimide alkane acid methyl esters has been synthesized and studied by DSC, polarized optical microscopy and X-ray diffraction methods. All compounds form a monolayer smectic A phase. It was found that 2-{4-[(4′-decyloxybiphenyl-4-yl)oxycarbo…
The effect of annealing at argon pressure, HP, up to 1.5 GPa on photoluminescence, PL, of oxygen-containing silicon (of Czochralski grown, Cz-Si, and of oxygen-implanted, Si:O) and of thermally — grown SiO2 films was investigated. Pressure-annealing of Cz-Si and Si:O at 720 to 1400 K affects the intensity of dislocati…
In this paper, a special lifetime testing apparatus is installed for dropwise condensation heat transfer on polymer-coated surfaces. Film and dropwise condensations are simultaneously carried out in the same condensing chamber to get rid of any containments. The discontinuous experimental results demonstrate that one…
A series of poly(amide–imide)s IIIa–m containing flexible isopropylidene and ether groups in the backbone were synthesized by the direct polycondensation of 4,4′-[1,4-phenylenebis(isopropylidene-1,4-phenyleneoxy)]dianiline (PIDA) with various bis(trimellitimide)s IIa–m in N-methyl-2-pyrrolidone (NMP) using triphenyl p…
Boron NMR and NQR studies have been performed on three icosahedral borides: - and -rhombohedral boron and boron carbide (B 12 C 3 ). Two 11 B NMR peaks, separated by significant chemical shifts in the range from 130 ppm to 280 ppm, were clearly observed for all of the icosahedral borides that were not enriched in the…
Umpolung of ring strain by intramolecular Sn–N Lewis acid–Lewis base interaction is the key for the synthesis of thefirst organoelement oxides of the type (Ph2SiOR2SnOMO)[R = (CH2)3NMe2; M = But2Sn, But2Ge, PhB] which hold potential as precursors to tertiary metal oxides.
Hydrogen embrittlement of a copper precipitation strengthened and niobium microalloyed HSLA-100 steel on cathodic changing in synthetic seawater has been studied using slow strain rate technique. The effects of potential applied for hydrogen changing, pre-charging with hydrogen and changes in strain rate have been stu…
Regular patterns form in many solidification processes. Examples occur during lamella and rodlike eutectic growth and when single phase cells or dendrites are formed. The scale and regularity of the microstructure can determine the properties of the cast materials and is thus important practically. The purpose of the…
Mercury resistance determinants in bacteria are often plasmid‐borne or transposon‐mediated. Mercuric reductase, one of the proteins encoded by the mercury resistance operon, catalyses a unique reaction in which mercuric ions, Hg (II), are reduced to mercury metal Hg(O) using NADPH as a source of reducing power. Mercur…
The aim of this paper is to clarify the difference in textural behavior during rolling between low and very low stacking fault energy fcc materials. The rolling texture developments of pure silver and Ag–Zn solid solution alloys containing 8 mass% and 18 mass%Zn were investigated in detail by means of the X-ray textur…
Chiral, smectogenic pendant groups have been covalently attached to cyclic oligosiloxanes by hydrosilylation. These materials and the olefinic compounds from which they were derived exhibit ferroelectric behavior. The mesomorphic range, and in particular the S C * phase, of these oligomers is greatly enhanced relative…
An examination was made of the adhesion of ABS resin to treated metals such as phosphor bronze, brass plates, and electronickel platings during injection molding. No adhesion to any of these metals was noted to occur under ordinary injection molding conditions, and an aqueous solution of 1,3,5-triazine-2,4,6-trithiol…
Reaction of tetrachloropyrimidine (1) with pyridine resulted in the formation of a heteroaromatic tripole, the 2,6-bispyridiniopyrimidin-4-olate chloride (3), the structure of which was established by X-Ray crystallography.~m b e r l i t e ~ IRA-400 in its hydroxy form converted 3 into the corresponding stable hydroxi…
FTIR spectroscopy has been applied to study the adsorption and dehydrogenation of ethane on a silica-supported platinum (Pt/SiO2) catalyst with metal particles diameters mostly in the range 5–15 nm and with predominantly [111] micro-facets. At ca. 90 K, there is clear spectroscopic evidence for the formation of a firs…
Thermoelectric properties of Chevrel-type sulfides AMo6S8 (A=Fe, Ni, Ag, Zn, Sn, Pb, Cu) were investigated with respect to many advantageous characteristics of the Chevrel compounds for thermoelectric applications. The electrical conductivity, σ, was 102.5S·cm-1<σ<103S·cm-1 for most of the samples from room temperatur…
Syntheses of acenaphtho[1,2-b][1,4]oxathiine 4 and 8,9-bis(methylsulfanyl)acenaphtho[1,2-b][1,4]dithiine 5 are reported. The fairly persistent radical ions of acenaphtho[1,2-b][1,4]dithiine 1, acenaphtho[1,2-b][1,4]benzodithiine 2, acenaphtho[1,2-b]thieno[3,4-e][1,4]dithiine 3, and 4, i.e. 1˙+–4˙+ and 1˙––4˙–, were ge…