Materials Literature
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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…
This paper presents the newest applications of silicone composite insulators which are finding increasing use not only in Switzerland, but also in the power industry worldwide. These applications include interesting designs for railway overhead lines, medium voltage lines, and 400 kV high voltage overhead transmission…
Urea-induced unfolding of Escherichia coli citrate synthase occurs in two phases, as monitored by circular dichroism at 222 nm (measuring secondary structure) or by tryptophan fluorescence. In this paper we characterize the intermediate state, which retains about 40% of the ellipticity of the native state, and is stab…
We present what we believe to be the first implementation of a Fabry-Perot (FP) etalon using polymer cholesteric liquid-crystal mirrors. These polymer mirrors have each been fabricated onto a single substrate, which allows the FP cavity spacing to be only a few micrometers wide. For the experimental results presented,…
The solution polycondensation of aromatic dithiols with activated aromatic dihalides like bis(4-fluorophenyl) sulfone with use of cesium fluoride as a base in polar aprotic solvents readily affords aromatic polysulfides having inherent viscosities as high as 1.0 dL/g. The polycondensation proceeds under essentially ne…
Three novel polyfluorinated cationic surfactants having a short perfluoroacyl group and double long alkyl chains, and three corresponding hydrocarbon analogues were synthesized. All of the surfactants formed small unilamellar vesicles in water upon sonication. The temperature conditions for the sonication were careful…
Money trees are artifacts dating from the Eastern Han dynasty (AD 25–220) which have been excavated from tombs in China. The branches of these trees are constructed of bronze, and contain images of coins along with figures important to Han beliefs. Samples from bronze branches originating from several different trees…