Materials Literature
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Studies have demonstrated versatility of PMR approach for tailor making polyimide matrix resins with side range of flow characteristics. By simply adjusting molar ratio of reactants in monomer mixture, resins having flow values of as much as 20% can be achieved.
A trial has been made to formulate the surface tension of pure liquid metals by use of basic physical quantities from a practical standpoint. The effective interatomic potential was given in a simple form as a function of the melting point and atomic volume by use of Lindemann’s formula under the assumption which cons…
Wettability, as indic.atedby contact angle with water, of phellogen and old phloem surfaces of loblolly pint: (Pinus taeda) rhytidome was determined after extraction, heating, and aging.These two tissnes are the predorilinant surfaces exposed after riiilling pine bark into srnall particles.Contact angles rileas~ired f…
The growth of tantalum carbide fiber by an a‐c discharge method was studied. Maximum growth rates of up to 40 mm/min were obtained under the, following conditions: the discharge current (60 Hz) was 0.4–0.6 mA; the concentrations of hydrogen, argon, tantalum pentachloride, and propylene were 4.9, 94.4, 0.2, and 0.5%, r…
An empirical relation between the lattice constant and the magnetic moment was found in binary solid solutions of 3d transition metals expressed as a(x)=aA(1-x)+ aB x + C <|µ|>, where x is the atomic fraction, aA, aB and C are parameters, <|µ|> the average magnitude of atomic magnetic momen…
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…