Materials Literature
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Fragilaria oceanica the dominant component in a mixed bloom of diatoms and a blue green alga which occurred near Mangalore in August 1972 showed a density of 36.8 x 106 cells/l and constituted 92% of the total number of cells in the bloom. The components of the bloom were Rhizosolenia sp. Pleurosigma sp. Coscinodiscus…
Abstract not Available.
Abstract A method which allows the rapid and accurate determination of specific surface area for materials from a single point on the nitrogen adsorption isotherm is described. The calculation is made from a single adsorption point which can lie almost anywhere on the isotherm. The method does not suffer from the theo…
We have succeeded in growing single crystals of MnBi which are essentially free of excess bismuth. We report here on magnetization measurements on such single crystals from 4.2 K to 635 K in magnetic fields up to 21 kOe using a vibrating sample magnetometer. The magnetization at 4.2 K is 3.84±0.03 μB/Mn atom and is pe…
Under the experimental conditions employed, and especially for highangle grain boundaries, the penetration distance, the diffusion coefficient and the activation energy for the diffusion of zinc along tilt boundaries in aluminum strongly depend on the misorientation. For a given boundary, the previously mentioned quan…
We have shown that it is possible to grow a uniform Ta oxide film up to a thickness of 1500Å by plasma oxidation. The average speed of growth was 0.1 Å/sec, which is comparable to earlier studies. Our experiments show that there is no significant contamination of the oxide due to sputtering from the cathode and that t…
Measurements have been carried out of the parallel and perpendicular magnetostriction of a polycrystalline equi-atomic FeRh alloy. Measurements were made in pulsed magnetic fields up to 15 T in the antiferromagnetic phase and at the antiferro-ferromagnetic transition induced by the field. The perpendicular antiferroma…
With new techniques of crystal growth new problems have been encountered with the platinum apparatus used in crystal production. Some of these difficulties are discussed in this paper, including attack by bismuth oxide, Bi 2 O 3 , and dissolution of the platinum in the leaching acids, together with methods of prolongi…
The use of hydrogen as a rocket fuel has been successfully established; however, it has also been established that many metals are degraded in one or more of their properties by environmental gaseous hydrogen. The degree of degradation may range from slight to extreme, depending on the metal being analyzed and the typ…
High-impulse current and voltage measurement in high-voltage technology and plasma physics is generally accompanied by high-level electromagnetic interference. This paper gives an analysis of various avenues of conducted and radiated interference entry showing that cable braid and cabinet currents represent major sour…
Single crystals of tin oxide (SnO 2 ) have been grown by a vapour-phase transport method and subsequently doped with terbium ions. The cathodoluminescence of these crystals has been measured at room temperature (300 K). The spectra comprise the intrinsic emission band of the host lattice and bands due to the presence…
Stress-induced acicular martensites in Cu-14.2Al-4.3Ni (wt%) alloy were investigated by means of transmission electron microscopy and selected area electron diffraction method. As a result acicular γ′ martensites were found beside numerous β1′ martensites reported previously, although the occurrence was quite rare. Th…
A number of high-spin iron(II) chelate complexes with some bidentate monoanionic ligands (β-diketonates, salicylaldehydate, and N-alkylsalicylideneiminates) and the quadridentate dianion NN′-ethylenebis(salicylideneiminate), and its analogues, has been studied by means of Mössbauer and electronic spectroscopy. In all…
The selective reflectance of S-cholesteryl 14-phenyltetradecanethioate was determined as a function of the wavelength and temperature at several constant values of temperature and wavelength respectively. The dependence of wavelength λp measured at maximum selective reflectance on temperature T could be curve fitted w…
A number of the Te-containing perovskites compounds have been studied. It has been established that some of them are either ferro-, ferri or antiferroelectrics. The influence of the different factors on the Curie temperatures is analysed. A tentative conclusion about the principal role of the Te6+-sublattice vis-a-via…
By the use of a quasi-static method the complex piezoelectric constant d22 of AgNa(NO2)2 has been measured over a temperature range -100°C ∼ 38°C and a frequency range 10 Hz ∼ 20 kHz. It was found that d22 shows a dispersion of Debye type, d22 =d∞ + (do - d∞)/(1 + iwr), where the relaxation time τ coincides with that…
I.r. and visible spectra identify the blue species in solutions of alkali polysulphides in dimethylformamide (DMF) as S3–. Elemental sulphur (S8) is reduced to S3– by secondary amines in hexamethylphosphoramide (HMPA). The reaction of piperidyl-lithium with S8 in HMPA has been investigated to determine the stoicheiome…
Abstract The structure and self‐assembly of collagen and procollagen molecules are reviewed. The registration peptides of procollagen have specific recognition properties which assure (1) selection of component polypeptide chains and (2) registration of their N‐termini, facilitating orderly folding into a collagen hel…
Article Equiatomic Ternary Phases in the Alloys of the Rare Earths with Indium and Nickel or Palladium was published on January 1, 1974 in the journal International Journal of Materials Research (volume 65, issue 1).
Flexural strengths, elastic moduli, and fracture energies of 3BaO·5SiO 2 glass‐ceramics with a variety of microstructures were determined. Flexural strength depends on the size of spherulites in the microstructure and on the amount of glassy phase remaining in the material. Higher strengths were achieved in glass‐cera…