Materials Literature
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標題の系のガラス化範囲を求めた. この系のガラスの導電率の組成及び温度依存性を100℃からガラス転移点 (Tg) の10°-20℃下の温度までの範囲で測定した. また密度, 熱膨張率, Tg, 遷移金属イオンの還元イオン分率を測定した. 電気伝導機構をMottによるスモール・ポーラロン・ホッピング理論によって検討した. これらのガラスには断熱近似 (トンネル係数αを零とする) が, 光学フォノン振動数 (ν0) の値1けた以内程度の誤差で, ほぼ適用できた. しかし他の実験結果と矛盾しないようなα及びν0の値は得られなかった. 導電率の組成依存性を決定する因子としては活性化エネルギーが支配的であった.約10mol%以下のFe2O3…
The profile of an axisymmetric sessile drop is described by an analytically insoluble second-order differential equation, which can be obtained either from Laplace's equation or by employing the calculus of variations to minimise the free energy of the solid/liquid/fluid system. Most reported methods of solution invol…
To clarify the relation between a molecular structure and an order parameter of a dichroic dye of a guest-host liquid-crystal cell, a ratio l/d of a length l to a diameter d of a circumscribed cylinder of the dichroic dye is used as a parameter. Experimental results clarify that there exists an obvious correlation bet…
Ground-state CHF radicals, formed in the gas phase by infrared multiple photon dissociation, and detected by laser-induced fluorescence, react with NO and O2 with bimolecular rate constants of (7.0 ± 0.4)× 10–12 and <5 × 10–16 cm3 molecule–1 s–1, respectively, at 295 K. NCO (X2Πi) is detected as an important product o…
A concentrated solution of K[MnO4] undergoes a ready reaction with acetylacetone, in the absence of any buffer, giving a very high yield of the title compound, [Mn(acac)3]. The pH of the solution, recorded immediately after the formation of crystalline [Mn(acac)3], was found to be ca. 5. Electron impact induced mass s…
Crystallized quartz has been obtained from amorphous silica prepared by the hydrolysis of silicon alkoxide containing calcium or magnesium alkoxide (10 mol %). The crystallization of CaSiO3 and MgSiO3 is observed prior to that of quartz. Crystallization isotherms are described by the contracting cube equation 1 –(l –f…
Les argiles kaoliniques exploitées industriellement dans le bassin des Charentes sont essentiellement composées de kaolinite mal ordonnée à bien ordonnée, de mica, de quartz et d'anatase. A partir de considérations statistiques sur le statut du fer, les auteurs présentent une méthode d'analyse minéralogique quantitati…
The four primary Zircaloy fuel cladding deformation phenomena—axial elongation, circumferential creep, ovalization, and ridging—have been investigated for fuel irradiated in four modern pressurized water reactors. The axial elongation of fueled and nonfueled rods is examined by a regression fit for dependence on fluen…
(1982). Solidification Structure of Gas-Atomized High-Speed Steel Powders. Powder Metallurgy: Vol. 25, No. 1, pp. 1-9.
The influences of 11 elements in sheet steel, temperature and Al content in zinc bath on the adhesion were investigated by use of continuous galvanizing line and laboratory galvanizing simulator. The adhesion was remarkably affected by Si in the steels, the temperature and Al content.The influences of Ti, Si and P in…
In order to clarify the strength of structures which require leak tightness, when struck by projectiles, a series of impact tests for steel plates have been carried out. Cylindrical, semi-spherical and conical-nosed SUS304 stainless steel projectiles were impacted onto carbon steel target plates 7∼38 mm thick. Test re…
Abstract Addition polyimide oligomers have been synthesized from 3,3′,4,4′‐benzophenone tetracarboxylic acid dianhydride and 3,3′‐methylenedianiline using a variety of latent crosslinking groups as end‐caps. The nominal 1300 molecular weight imide prepolymers were isolated and characterized for solubility in amide, ch…
The problems of high fuel bills, maintenance costs, and loss in performance are of continuing concern to all boat and ship owners, whatever the size of vessel. These problems can be technically and economically alleviated by the use of cupro-nickel for hull construction, as has been shown by considerable service exper…
An environmental scanning electron microscope can be made by incorporating a pressure limiting aperture at some distance below the objective aperture of an SEM, and by providing independent pumping between these two apertures. Tilting of the pressure limiting aperture with respect to the axis of the electron optics co…
The viscosity of solutions of four proteins (Bovine Serum Albumin, Ovalbumin, α s -1 Casein, Lysozyme), brought to the random coil conformation, has been measured over a large concentration range extending into the entanglement region. A master curve is obtained in the dilute and semi-dilute regions with the reduced v…
The crystal structure of SbSeI has been determined with the intensities of 821 independent reflections, measured on a computer-controlled Philips PW 1100 single-crystal diffractometer. The cell constants, obtained by least-squares calculations from direct ∂ -value measurements on the diffractometer, are: a = 8.6862(9)…
Se describe Nannochloropsis gaditana Lubién spec. nov., Eustigmatophyceae aislada de la Bahia de Cádiz, como resultado de los estudios sobre su morfología, ultraestructura, composición de pimentos y fisiología del crecimiento. N. gaditana se diferencia de las otras dos especies, N. oculata (Droop) Hibberd y N. salina…
The kaolin minerals are not ideal ionic solids but, for many purposes, they can be treated as such. The classical ionic theory allows the calculation of the potential energy of these minerals. By minimizing the potential energy as a function of one or more parameters (distances, angles, etc.) one can determine hydroxy…
Seven kaolins were examined. Several phases containing iron were analysed by comparison of the used spectroscopies. Mössbauer spectroscopy shows that a part of the Fe²⁺ cannot be in the structure of kaolinite. At low temperature, we observe for one sample, presence of superparamagnetic particles of hematite and goethi…
We apply the matrix representation technique to determine the concentrations of three dye components in the liquid-crystal mixture needed to make a black-and-white guest-host display. This method employs the Newton-Raphson iterative process to match the tristimulus values of the mixture to the tristimulus values of th…