Materials Literature
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A Moraxella strain capable of utilizing 1, 4-type polybutadiene as a sole source of carbon was isolated from soil. About 40% of polybutadiene having a number average molecular weight (Mn) of 2, 350 was degraded and assimilated by the strain in 5 days. A polybutadiene sample with an Mn of 16, 100, however, was hardly d…
(1984). The influence of relative humidity in the polymerization of methyl trimethoxy silane. Studies in Conservation: Vol. 29, Preprints of the Contributions to the Paris Congress, 2-8 September 1984. Adhesives and Consolidants, pp. 177-181.
The results of a neutron diffraction study on U0.5Np0.5 O2 solid solution at low temperature are reported. Below T = 12 K the solid solution is magnetically ordered with a magnetic structure different from that of the UO2 low temperature phase. The temperature dependence of the observed magnetic line width could sugge…
Stationary behavior is investigated by plotting the stationary polarization curves (I,V) and by examination of the dissolution morphology with scanning microscopy. It is shown that in 4 M deaerated HCl, the TU2 alloy dissolves more rapidly than the unalloyed titanium T40, whereas the TA6V alloy dissolves less rapidly.…
In this account, a systematic enumeration of 109 littoral and epiphytic diatoms of the south west coast of India is presented. This work forms a supplement to the available information regarding the diatom flora of the Indian Seas.
The crystal structures of K3Sn2(SO4)3X (X = Br or Cl) have been determined by the heavy-atom method and refined by the full-matrix least-squares method to R= 0.0564 for the bromide and 0.0839 for the chloride. The crystals of both compounds are of the hexagonal space group P63(C66, no. 173) with a= 10.256(2), c= 7.582…
Geometrical relationships between fabric and sewing thread are developed for lock- stitch seams in plain woven fabrics. The tendency to pucker is associated with structural jamming within the fabric. Jamming increases with stitch count and decreases with thread size as reported in earlier studies.
The activity of Cu in solid Co for 1158≤T≤1473 K has been determined by equilibrating the surface of initially pure Co plates with liquid Ag–Cu alloys and by using the literature values of the Cu activity in Ag–Cu alloys. The equilibration has been confirmed from good agreement of surface compositions between an initi…
The effect of pH on the fluorescence intensity of 3-aminofluoranthene shows that the rate of proton-induced quenching is much smaller than the rate of protonation in the S1 state. This behaviour is quite different from that observed for other arylamines.
Fusion power stations using the deuterium-tritium reaction will have substantial inventories of tritium in the oxide, molecular, and solid (metal hydride) forms. A new Canadian fusion engineering project based on Canada deuterium uranium (CANDU) operating experience with deuterium and tritium and plans to extract and…
The thermal properties of NaKSO4 crystal, grown at 315 K by the slow evaporation method, were studied in the 300-500 K temperature range by performing Thermomechanical (TMA), Thermogravimetry (TG), Differential Thermal Analysis (DTA) and Differential Scanning Calorimetry (DSC) measurements. Thermal expansion coefficie…
The surface tension and the dispersion and polar components of the surface tension for fatty acids, fatty alcohols, and triglycerides were estimated by contact angle mea surements in order to apply these concepts to a detergency study. An extended Fowkes' equation was adopted for the calculation. γL of liquid oils (fa…
Grain radii of α and γ phases in duplex stainless steels annealed at 1 000 -1 200°C have been measured, and the growth mode of α and γ grains has been investigated. The results obtained are as follows :(1) The grain size of duplex stainless steels is much finer than those of α and γ single phase stainless steels. This…
The distribution of substituents in partially substituted cellulose ethers (methyl-, carboxymethyl-, benzyl- and methallylcelluloses) prepared in aqueous and non-aqueous systems was studied. The reactivity order of three hydroxyl groups in cellulose in aqueous systems was HO-2>HO-6>HO-3 with the exception for benzylat…
Castings have been and will continue to be used widely for applications involving wear in the internal-combustion engine. There is, however, a trend towards more sophisticated requirements as the demands on critical components increase. These demands particularly require the use of components with low friction, long w…
Abstract The electrical conductivities of three organic polyiodide chain complexes, α‐cyclodextrin‐KI‐I 2 · 4 H 2 O amylose‐iodine and (coumarin) 4 ‐KI‐I 2 are observed to be decreased at high pressure upto 80 Kilobars along the direction of iodine chains. The lowering of conductivities at high pressures and the Arrhe…
The ductile failure of rapidly expanding metal rings is considered with emphasis on the role of inertial forces in the dynamic fragmentation process. Expressions for the fragment size and fracture strain dependence on strain rate are obtained and compared with experiments on aluminum and copper rings. The experimental…
Abstract Quantitative structure‐activity relationships have been studied for the aqueous solubilities of 25 polycyclic hydrocarbons (PAH) at 25°C. Multiple regression correlations are reported between aqueous solubility (X) and molecular size descriptor (molecular surface area, molecular volume or molecular weight), m…
Two models are proposed to solve the sodium nitrate structure near the order-disorder phase transition (Tc = 276 °C). The first model is built with the static disorder assumption between the two equilibrium positions of NO-3 ions. In this case, disorder is characterized by an order parameter : η. For the second model,…
Fifty-six of the more abundant estuarine epipelic diatoms are described from surface sediment samples collected from the upper basin of the Pettaquamscutt River, Rhode Island. Biraphid diatoms are the dominant primary producers on the muddy sediment under 2 to 7 m water. Three families are represented (Navicula-ceae,…