Materials Literature
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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,…
Description de la structure cristalline de Ba 2 Ca(B 3 O 6 ) 2 qui cristallise dans le groupe d'espace R3 avec a=7,165, c=17,680 A, Z=3. Relations structurales se rapprochant davantage de la forme β haute temperature que de la forme α basse temperature de Ba 13 ZO 4 . Composes isotypiques obtenus pour Cd, Mg, Co et Ni…
Precipitation of M23C6 and σ-phase during isothermal aging of δ/γ duplex stainless steels has been studied mainly by means of transmission electron microscope coupled with energy dispersive X-ray analyser. M23C6 particles form at both γ/γ and γ/δ boundaries. The particles are crystallo-graphically related to either on…
The crystallographic and magnetic properties of Tm 6 Fe 23 before and after hydrogen absorption were studied by means of X-ray diffraction, bulk magnetic measurements and 169 Tm and 57 Fe Mossbauer spectroscopy. The data were analysed in terms of a mean-field model. Coupling constants describing the magnetic interacti…
The study of the europium(III) ion + water + bromide system shows totally outer-sphere interactions between the anion and the ground-state 7F octa-(E8) and nona-(E9) hydrated europium species. An appropriate analysis of these interactions, involving the corresponding (E8B) and (E9B) outer-sphere bromocomplexes or any…
Reflection, absorption and emission spectra of InBr, InI and InBr 1- x I x mixed crystals have been measured at 2 K by using polarized light. In InBr, a prominent exciton peak is found at 2.48 eV for the polarization E // b , which is on the high energy side of the lowest direct exciton peak at 2.33 eV allowed for E /…
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CSF levels of GABA were investigated in a group of Parkinson patients without drug treatment and a group of Parkinson patients under treatment with L-DOPA or anticholinergics. Probenecid results in an elevation of CSF GABA levels in healthy persons. The results indicate a significant decrease of GABA levels in CSF in…
Experimental values are reported for the distortion viscoelastic and elastic ratios for a homologous series of nematic Schiff's bases : APAPAm (m = 1-5, 9) and OHMBBA as a function of temperature. In the experiments the homodyne photoelectric self-beat technique was used to detect noise intensity spectra and to determ…
A solid solution of nickel in β -rhombohedral boron of composition NiB 48.5 has been investigated using X-ray single-crystal diffractometry. The space group is R [unk] m (No. 166) and the hexagonal unit cell dimensions a = 10.9615(5) Å and c = 23.8544(7) Å. The boron atoms occupy 16 atomic positions, of which two are…
Abstract Synthesis and growth of PbTe and (Pb, Sn)Te single crystals by the Bridgman method and by the Travelling Heater Method (THM) from Te‐rich solutions are described. It is to be seen from comparative investigations that seeded THM growth reproducibly provides oriented single‐crystalline ingots free of low‐angle…