Materials Literature
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Tellurian tennantite with up to I I .17 wt,qo Te was found in copper-rich ores of the Besshi-type Ikadazu and Sazare deposits in the Sambagawa metamorphic belt in Japan. Electron-miooprobe analyses of the tellurian tennantite rweal that Teq+ substitutes for (As,Sb)3+, and electricalcharge-balance is maintained by simu…
The photoinduced oxidation of tetra(N-methyl-4-pyridyl)porphyrinmanganese(III) has been achieved in homogeneous solution. The manganese porphyrin was used as an electron donor in a three-component system with tris-(2,2'-bipyridine)ruthenium(II) as the photosensitizer and chloropentaamminecobalt(III) as the electron ac…
High-frequency travelling-bubble cavitation noise generated on a Schiebe headform is analyzed with reference to several existing noise theories which are based on the collapse of a single spherical bubble. After normalizing the noise level by a bubble event rate, the normalized cavitation number based on the minimum p…
Abstract X‐Ray diffraction and neutronographical studies on the crystal structure of the perovskitelike compounds A(Cu 1− x Mn x )Mn 4 O 12 have been undertaken. It has been shown that the samples with 50% of Mn 3+ in the octahedral sites have a cubic unit cell, while the samples with higher Mn 3+ composition may have…
A material balance closure calculation is presented to test the consistency of a previously published model of a parallel plate electrochemical reactor. New expressions are used in this procedure to calculate the average concentration of species i and the average current density for reaction j from the predicted conce…
Abstract Neu dargestellt wurde KLi 6 [IrO 6 ] aus innig verriebenen Gemengen von K 4 [IrO 4 ] und Li 2 O (Ag‐Bömbchen, 30 d, 750°C). Die tiefdunkelroten Einkristalle kristallisieren trigonal‐rhomboedrisch, Raumgruppe R 3 m, mit a = 819,61(8) pm, c = 709,96(11) pm und Z = 3. Es liegt aufgefüllte Variante des α‐Li 6 [UO…
In the course of a half-reaction of enzymic transamination, the aldimine adduct formed between the coenzyme pyridoxal 5'-phosphate and the amino acid substrate tautomerizes to the ketimine intermediate which is then hydrolyzed to the oxo acid product and the pyridoxamine 5'-phosphate form of the enzyme. In the reverse…
ESR spectra of K2SO4 crystals irradiated with x rays at 26 K contain signals from a novel type of defect in three inequivalent configurations. The g tensors, linewidths, and hyperfine splittings from one potassium nucleus all indicate that the defects are structurally analogous to the primary electron-excess defects […
Abstract A finite element method coupled with the method of characteristics is applied to the problem of convective‐dispersive transport with non‐equilibrium reaction. Convective terms are calculated using moving particles together with influence element meshes for particle tracking, whereas dispersion terms are calcu…
A Coulter Counter, Model TAII, was used to determine both solubility and surface specific dissolution rate of two sparingly soluble materials suspended in micellar solutions. The equilibrium solubility increased linearly with surfactant concentration, thereby making it possible by extrapolation to characterize materia…
Twelve species of the diatom genus Thalassiosira, most of them recently described, are recorded from the Thames Estuary and other estuaries and places round the British coast. Brief notes, with transmission electron micrographs, are given on the following species: T. profunda (Hendey) Hasle, T. proschkinae Makarova, T…
Abstract The kinetics of crystallization of quenched poly(ethylene terephthalate) (PET) films during the imbibition of methylene chloride (MeCl 2 ) vapor is studied by density measurements. The effects of film thickness (0.0025–0.086 cm) and temperature (0–38°C) were examined. The data suggest that MeCl 2 transport co…
n -Butanol fraction of aerial parts of Achyranthes aspera Linn. prevented pregnancy in adult female rats when administered orally at 75 mg/kg dose on days 1-5 post-coitum , but was ineffective in hamsters upto 300 mg/kg dose. In ovariectomized immature female rats, the extract exhibited potent estrogenic activity at t…
This study examined the thermal behavior of cast gypsum specimens, with and without additives, by means of simultaneous differential thermal analysis-thermogravimetry (DTA-TG) and dilatometry. Specimens were prepared from wet-calcined hemihydrates (Hydrocal and Densite). The additives studied were boric acid (H3BO3) a…
The chromiferous skarn mineral associations at Outokumpu have been described and a number of characteristic chromium-bearing minerals have been re-examined. A large number of wet chemical and microprobe analyses are presented for zincian chromite, uvarovite, chromian diopside, chromian tremolite, eskolaite and chromia…
Abstract Poly(ethylene terephthalate) (PET) was synthesized from its monomer bis‐hydroxyethyl terephthalate (BHET), in the presence of Sb 2 O 3 catalyst. A second order irreversible reaction model was developed, and the apparent rate constant was evaluated by observing the course of intrinsic viscosity change. At 278°…
Abstract The Rokle bentonite deposit is part of an accumulation of argillized volcanoclastic rocks in the Tertiary stratovolcanic complex of the Doupovské Mountains east of Karlovy Vary (Carlsbad), about 100 km westnorthwest of Prague, Czechoslovakia. The arenite basalt ash was originally composed of hyaloclasts and s…
Abstract A detailed microstructural study of heavily rolled α-brass has revealed that in addition to straight shear bands a ‘wavy’ structure is also present. The cold-rolled material is considered to exhibit laminar structures and properties that are similar in some respects to the behaviour of laminar composite mater…
A generalized electret generator using polymer film electrets is proposed. The rotor of the generator consists of a conducting disk and several fan-shaped pieces of two types of film electret, attached to the conducting disk with alternate polarity. The stator consists of a conducting disk with holes that have the sam…
The density and ultrasonic velocity of N(p-n-heptyloxybenzylidene) p-n-pentylaniline (70.5) are measured as a function of temperature from the isotropic liquid to the smectic B phase. The compound is pentamorphic, exhibiting four smectic phases, viz. smectic G, smectic B, smectic C, smectic A, and a nematic phase. The…