Materials Literature
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xR2O・B2O3・rSiO2系ガラス (0<x<1.3; r=1及び2; R=Na及びK) 並びにyNa2O・(1-y)B2O3系ガラスの弾性的性質をパルス伝ぱ法で測定した. ナトリウムホウ酸塩ガラス及び5mol% MgOを含むこの系のガラスの弾性率は (MgO+Na2O)/B2O3=0.5において最大値となった. この組成はこれらのガラス中の4配位ホウ素の割合N4がN4=(MgO+Na2O)/B2O3の関係よりはずれる組成と一致する. したがって, 弾性率はN4が最大となる組成あるいは非架橋酸素の発生を告げるインジケーターとしての働きがあることが示唆される. このアルカリホウ酸塩系ガラス中での結果をホウケイ酸塩系ガラスに適用し…
A practical synthesis of the chlorin macrocycle has been developed which depends on a mild photochemical cyclisation as the key step.
Banding patterns of freeze-etched and replicated rat tail tendon collagen fibrils were studied. Better banding definition was obtained by freezing the samples without using a cryoprotectant and by prolonging etching. Under these conditions, the banding pattern was characterized by a sequence of elevated and depressed…
Isobutane, 2-methylprop-1-ene, and aromatic compounds are formed from CO–H2 on rare earth metal oxides (La2O3 and Dy2O3) under severe conditions (P 400 bar and T 410–475 °C).
Dibenzotetraselenafulvalene has been synthesized from 1,2,3-benzoselenadiazole; charge-transfer salts based on the product show semiconducting properties.
The relationship between relative mobility on sodium dodecyl sulfate-polyacrylamide gels and the logarithm of molecular weight was linear for peptides derived by CNBr cleavage from purified collagen chains. One striking exception was found: when the CNBr peptide alpha 1(III)CB-8 was subjected to electrophoresis on a p…
Plasma spraying was employed to obtain rapidly solidified dense metastable alumina samples. They have been studied after being sprayed and in various annealed states by transmission electron microscopy and X-ray powder diffraction. The so-called “γ” phase has been imaged by T.E.M. and exhibits a more or less ordered d…
(1983). On the migration of helium bubbles. Radiation Effects: Vol. 78, No. 1-4, pp. 381-383.
Abstract Au 2 (SeO 2 ) 2 O was prepared from gold and excess selenic acid in a sealed tube at 533 K. The crystal structure [Pba2, a = 659.2(2), b = 1183.7(3), c = 399.8(1) pm, Z = 2,R = 0.087] was determined; gold atoms are bridged by oxide ions (lying on twofold axes) and selenite ions. The extended structure consist…
In order to study the gelling mechanism of gelatin, the phase diagram for a diluted gelatin solution was investigated. Phase boundary curves were obtained by measuring the fluorescent depolarization, optical rotation, reduced viscosity, and light scattering of the gelatin solution. The phase diagram obtained exhibited…
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Ester derivatives of a novel phenol, 4-cyano-2-fluorophenol, have been prepared and found to exhibit wide-range nematic phases; many of these esters exhibit higher clearing points than those of the corresponding esters containing a hydrogen atom in place of the fluorine atom.
Article Biddulphioid Diatoms. II: The Morphology and Systematics of the Pseudocellate Species, Biddulphia biddulphiana (Smith) Boyer, B. alternans (Bailey) Van Heurck, and Trigonium arcticum (Brightwell) Cleve was published on January 1, 1983 in the journal Botanica Marina (volume 26, issue 6).
The cation distribution in W3Nb14O44, determined by time-of-flight, powder diffraction on a pulsed neutron source, is found to be consistent with the site potentials calculated using an electrostatic model.
Abstract High- and low-spin Fe(III) complexes with the titled ligands, [Fe(Sal23,3,3-tet)](NO3) (S=5/2) (1) and [Fe(Sal23,2,3-tet)](NO3) (S=1/2) (2), have been synthesized. X-ray analyses for 1 and 2 show that, in each complex, the metal environment is pseudo octahedral with the two O atoms being trans. Difference of…
Anaerobically, Brochothrix thermosphacta fermented glucose primarily to l-lactate, acetate, formate, and ethanol. The ratio of these end products varied with growth conditions. Both the presence of acetate and formate and a pH below about 6 increased l-lactate production from glucose. Small amounts of butane-2,3-diol…
An empirical two-particle mobility tensor can be obtained by fitting the calculated mutual and local self-diffusion constants to available experimental data for hard-sphere-like dispersions. This mobility tensor, along with DLVO theory for the interparticle potentials, is used to calculate the mutual, local and long-t…
A series of new liquid crystalline compounds having two identical mesogenic terminal units, the 4-(p-nitrobenzoyloxy)phenoxy group, attached to both ends of a central polymethylene spacer of various lengths was prepared. The mesomorphic properties of the compounds were investigated by differential scanning calorimetry…
Tool and manufacturing engineers handbook: a reference book for manufacturing engineers, managers and technicians , Tool and manufacturing engineers handbook: a reference book for manufacturing engineers, managers an... , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
The density and the surface tension of Na2O-Fe2O3 and RO(R=Ca, Sr, Ba)-Fe2O3 melts have been measured to investigate the structure of these melts. Fe3+-ions may be amphoteric ions in these melts, that is, an oxygen 4 coordinated Fe3+ ion forms an oxygen complex anion such as SiO2 and an oxygen 6 coordinated Fe3+ ion a…