Materials Literature
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In this paper we briefly discuss the operation of the silicon intensified target (SIT) vidicon, describing what we conclude to be the most important properties of the detector. We provide experimental evaluation of the SIT vidicon characteristics, including two-dimensional image fidelity, channel-to-channel and pixel-…
Thermal conductivity (A) data for two dense Cr 2 O 3 samples are reported. The results, which span the temperature range 270 to 360 K, show an inflection near the Neel transition temperature, 308 K. An analysis shows that the slope of the higher‐temperature portion of the λlD −1 −T curve is about what would be expecte…
The effect of several chemical and physical treatments for PbTe(100) surface cleaning was investigated by XPS. Etching with a (NH4OH+H2O2) solution shows a remarkable contrast to etching with acid, the first one being suitable to eliminate carbon contamination. The combination of the (NH4OH+H2O2) etching, heating and…
Abstract Eine Apparatur zur Untersuchung der Spannungsrißkorrosion von Stahlen in flüssigem Ammoniak unter definierten elektrochemischen Bedingungen wurde aufgebaut. Ein Rechner steuerte den Versuchsablauf und registrierte die Meßdaten. Die dazu nötigen Programme wurden entwickelt. Versuche mit Rundproben aus Schweißs…
Abstract The voltage lifetime of a poly(ethylene terephthalate)/glass composite is measured for two different orientations of short fiber with respect to the applied electric field (perpendicular and parallel). The difference in the voltage lifetime between two configurations is attributed to the microstructural featu…
Summary Monitoring of microbial corrosion is always difficult because of the sessile nature of bacteria and the lack of meaningful correlation between routine bacteria counts and bacterial activity. This problem is further aggravated in a large oilfield water system because of size and sampling difficulties. This pape…
We calculate the electric conductivity of a system consisting of parallel layers of insulator, embedded into a uniform conductor. Each layer is perforated by holes, which are arranged on a two-dimensional hexagonal lattice. We investigate various stacking patterns of the layers, in volume fractions of 40% to 50%. The…
Abstract The phthalide‐containing epoxy resins are synthesized and characterized in comparison with the bisphenol‐A epoxy resins in terms of thermal properties. Although both resins contain comparable amounts of halogens, the resulting flame retardancy is higher in the phthalide‐containing resin. The char formation up…
Birefringence, densite, mesures en calorimetrie differentielle a balayage, mesures de retrait
Measurements were made of working level ratios and the effective diffusion constants of radon daughters using a special housing designed to provide a uniform diffusional environment at the passive detectors. For 2 of 7 exposures, the measured scale of the diffusion was too large to satisfy the uniformity requirement.…
Abstract Phase separation behavior has been studied in aqueous solutions of partially butyralized poly(vinyl alcohol) (BuPVA) with various degrees of butyralization x Bu and various molecular weights. It is found that these systems exhibit both upper and lower critical solution temperatures. The theta temperatures θ L…
SUMMARY The combination of a scanning electron microscope and a microcomputer can be used to carry out automatic, quantitative, morphological analysis of a wide range of samples. A system implemented around a commercially available 8‐bit computer and interface hardware is described. Computerized analysis of shape is m…
The relation between fibre crimp and fabric quality is investigated for various fabrics of different grades. It is found that fibres taken from fabrics of good quality have a high crimp level and that fibre crimp plays an important role in yarn extensibility, compressibility, and fabric extensibility and improves fabr…
The magnetic structure and magnetic phase transitions of Sc 1- x Ti x Fe 2 with x ≧0.7 are studied from measurements of Mössbauer effect and magnetization. A coexistent state of ferro- and antiferromagnetism appears below ∼100 K for x =0.9 and below ∼200 K for x =0.75. The results suggest that this system is an itiner…
Abstract In a one‐band model, the total carrier mobility relations, deduced from the Debye‐Conwell formula and Mathiessen's rule, are compared. With the help of these two laws the resultant mobility and the thermoelectric power (TEP) kinetic term variations are given. For n‐type MoTe 2 single crystals, it is shown tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotodecomposition of nitromethane trapped in solid argonMarilyn E. JacoxCite this: J. Phys. Chem. 1984, 88, 15, 3373–3379Publication Date (Print):July 1, 1984Publication History Published online1 May 2002Published inissue 1 July 1984https://pubs.acs.org/doi/10.1021/j150659a…
Abstract Zeolite ZSM-5 was easily synthesized by using ZSM-5 seed crystals as crystallization nuclei from acetone/water mixture system without any organic templates. A small amount of acetone in a reaction mixture inhibited formation of α-quartz and facilitated rapid crystallization of ZSM-5 under the mild hydrotherma…
Abstract The crystal of (TMTTF)2ReO4 is isomorphous with the other (TMTTF) 2X compounds(X=ClO4, PF6, Br,···). TMTTF molecules are stacked face-to face to form a zig-zag column. Although the structure of (TMTTF)2ReO4 closely resembles that of the analogous compound, (TMTSF)2ReO4, the loose intermolecular contacts in (T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical synthesis of a new polysaccharide. Ring-opening polymerization of 1,6-anhydro-2,3,4-tri-O-benzyl-.beta.-D-allopyranose and preparation of stereoregular 1→ 6)-α-D-allopyrananToshiyuki Uryu, Yoshihiro Sakamoto, Kenichi Hatanaka, and Kei MatsuzakiCite this: Macromolecu…
Hastelloy-X is a potential structural material for use in gas-cooled reactor systems. In this application, data are necessary on the mechanical properties of base metal and weldments under realistic service conditions. The test environment studied was helium that contained small amounts of H2, CH4, and CO. This enviro…