Materials Literature
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The dimensions of specimens undergoing preparation for examination in the SEM were measured throughout the preparative sequence or at various important stages. The tissues studied included 15-day mouse embryo limbs (MEL), small blocks of adult mouse liver and brain, and potato tuber. The animal tissues were fixed in 3…
Prototypic driver-fuel elements using metallic fuel and stainless-steel cladding, designed to achieve a high burnup, were tested in the Experimental Breeder Reactor II. The irradiation results showed that burnup of up to 10 at.% can be attained without cladding failure and that cladding deformation can be kept to acce…
The contact angles, θ, of pure liquids and of ethanol + water mixtures on griseofulvin powders have been determined from the rates of liquid permeation through powder beds. The associated free energies of adhesion and immersion (ΔiG) were negative. The corresponding enthalpies of immersion (ΔiH) were measured calorime…
The saturation effects of Eu 3+ luminescence in Y 2 O 2 S have been investigated using a pulsed nitrogen laser at room temperature and at 80 K, and also under pulsed cathode-ray excitation at room temperature. Interaction between excited-state Eu 3+ ions gives rise to a predominant energy-loss mechanism causing satura…
Oxidation of 1-aroylpyrroles by palladium acetate in acetic acid gave the corresponding 1,1′-diaroyl-2,2′-bipyrroles, which were easily hydrolysed in MeOH–H2O containing HCl to give 2,2′-bipyrrole.
Abstract Polarized IR‐reflection and Raman scattering spectra are obtained for TlGaTe 2 , TlInTe 2 , and TlInSe 2 crystals (space group D ). The IR‐reflection spectra of all the crystals show the presence of two ( E ‖ c ) and three ( E ⟂ c ) modes, which is in full agreement with the prediction of a group‐theoretical…
The concept of modeling an impact cratering event with an explosive event with the explosive buried at some equivalent depth of burst (d.o.b.) is discussed. Various and different ways to define this equivalent d.o.b. are identified. Recent experimental results for a dense quartz sand are used to determine the equivale…
The synthesis is described of an FeII porphyrin carrying an anthracene bridge across one face and a pyridine bridge across the other; this molecule minics the structural features and properties of natural oxygen-carrying systems.
Magnetic susceptibility data have been measured in the temperature range 1.75 to 60 K for the following structurally characterized, single chloride-bridged copper(II) chain compounds: dichlorobis(dimethyl sulphoxide)copper(II), dichlorobis(imidazole)copper(II), aquo(caffeine)dichlorocopper(II), and dichloro[2-(2′-meth…
Abstract The temperature dependence of the dielectric constant, polarization, and elastic compliance as well as the field dependence of the polarization and strain at different temperatures was measured at lead magnesium niobate single crystals for three different directions. From the results some conclusions with res…
A low oxygen content silicon crystal ingot with 2.5 × 10 17 to 3.5 × 10 17 atoms·cm -3 was obtained. It was grown by using the Czochralski crystal growth furnace heated with a graphite heater connected to a three phase electrical source, and by controlling the seed and the crucible rotation in conjunction with the flu…
Known interrelationships between fabrication, phase equilibrium, microstructure, and properties are reviewed for dense, polyphase silicon nitride materials fabricated with densification aids. In the first and second sections the raw materials, the manufacture of silicon nitride powder, impurities in these powders, and…
An hexagonal order is frequent in liquid crystals, namely in many smectic phases. We consider here the non smectic phases formed by hexagonally packed, indefinite and flexible rods. The Volterra method enables three main components of the translation defects to be defined : transverse edge and screw dislocations and l…
Direct Observations of the Arrangement of Atoms around Stacking Faults and Twins in Gold Crystals and the Movement of Atoms Accompanying Their Formation and Disappearance, Hashimoto, Hatsujiro, Takai, Yoshizo, Yokota, Yasuhiro, Endoh, Hisamitsu, Fukada, Eisaku
The theoretical determination of the initial domain structure and the phase boundary orientation inducing a wanted domain structure in the new phase seems to be a study of worthwhile interest. The W. L. R. theory {1} is not suitable for complex domain structure in each phase because mean distortions of the new phase c…
The adsorption of isopropyl alcohol and acetone on zinc oxide was studied by an infrared technique which revealed that isopropyl alcohol is dissociatively adsorbed at room temperature to form zinc alcoholate and hydroxyl group on the surface, while the adsorption of acetone takes place in its enolic form. When adsorbe…
Segment-long-spacing crystallites and reconstituted fibrils have been made from collagen extracted from the ejaculatory duct of the adult male locust, Locusta migratoria. These show the same banding pattern after positive staining as segment-long-spacing crystallites and fibrils made from mammalian type I collagen. Na…
A study is made of the crystallization of amorphous antimony film deposited on a glass substrate. The substrate is maintained at a desired temperature between 20°C and 90°C. The crystal growth in the films of thickness 210-550 Å is directly observed through an optical microscope. At any substrate temperature T s the r…
A. E. Underhill and D. M. Watkins, Chem. Soc. Rev., 1980, 9, 429 DOI: 10.1039/CS9800900429
Energy transfer from a sensitizer to an activator via Gd 3+ ions is discussed. This is done for the Bi 3+ → Dy 3+ and Sb 3+ → Dy 3+ transfer in , and for the Bi 3+ → Tb 3+ transfer in . The phosphor shows Tb 3+ luminescence with a quantum efficiency of 80% for excitation of Bi 3+ . After excitation of Bi 3+ , energy t…