Materials Literature
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North Vietnamese NR latexes were successfully epoxidized using peracetic acid at moderate temperature and pH range. The epoxide contents of pure epoxidized natural rubber (ENR) are from 5 to 70 mol%. The ENR products were characterized and determined by spectral and thermal analysis besides the chemical titration. Con…
There have been few experimental reports on cryogenic two-phase fluids and cavitation phenomena using the irradiation of pulsed high-power laser. This paper describes an investigation of the behavior of laser induced cavitation bubble in cryogenic liquid nitrogen. The bubble is produced by a pulsed ruby laser focused…
Abstract The new quaternary europium polysulfide KCuEu 2 S 6 was obtained using the reactive flux method at an intermediate temperature of 380°C by reacting K 2 S 3 with elemental Cu, EuS and an excess of sulfur. The Eu 3+ ions exhibit a bicapped trigonal prismatic coordination and the Cu + ions are in a tetrahedral e…
The chemical reactions that take place at surfaces as well as internally in nanoscale particles are of great scientific interest. Such reactions control the catalytic properties of small metal particles and thus are technologically very important. In order to allow enhancement of the performance of such catalytic syst…
Abstract. Point defects in solids can give rise to anelastic relaxation provided that the defects behave as elastic dipoles. Experiments with single crystals give information on the atomic configuration of the point defects. Measurements of the orientation dependence of the relaxation strength allow determination of t…
Influence of rotation on thermocapillary instabilities is demonstrated from linear stability analysis of a parallel flow model relevant to crystal growth. It is shown that system rotation has a dramatic influence on transitions at parameter values typical of the microgravity environment of an orbiting space laboratory…
A mathematical model of a helix with variable radius is developed to analyze geo metric and mechanical properties of a migrating fiber. The factors concerned include the frequency and amplitude of fiber migration as well as the equivalent radial position and equivalent helix height of the fiber. This treatment permits…
A combination of X-ray diffraction and high-resolution transmission electron microscopy (HRTEM) has been used to study the crystal structure of molybdenum uranium pentoxide, UMoO 5 , obtained by hydrothermal and ceramic methods. Crystal data: M r = 414.0, orthorhombic, Pbaa (number 54), a = 12.746 (1), b = 7.3494 (7),…
Natural rubber exhibits different storage properties when compared with synthetic polyisoprenes. Stored over an extended period of a few months, natural rubber is found to become progressively harder while the synthetic rubber is known to soften. This phenomenon of spontaneous crosslinking of natural rubber in storage…
Abstract Vinyl chloride is most commonly polymerized by suspension processes, where surface active materials as granulating agents and organic peroxides as free radical initiators are the crucial additives, which may affect PVC qualities substantially. Among the wide variety of usable and commercially available organi…
The hydrogen uptake behavior of two types of Zircaloy-2 specimens containing either fine intermetallic precipitates or coarse ones was studied at 623–723 Kin the pre-transition period of oxidation to clarify the role of the precipitates in the hydrogen transport through the oxide film. In the former case, the amount o…
The course of radiation induced damage produced in α-quartz by neutrons, ions, electrons or photons — commonly known as metamictization — has been re-analyzed by careful comparison of available experimental data. Specific interest was devoted to confront experimental metamict state features with current structural mod…
Abstract Complexes of Cu(lysine) 2+ 2 and Cu(histidine) 2+ 2 have been intercalated between the layers of saponite clays by a simple cation exchange procedure from aqueous solutions of preformed Cu(amino acid) 2 -complexes. Successful immobilization was obtained with an amino acid: Cu 2+ ratio of 5, and a pH of 10 and…
Requirements of tritium breeding ratio and the initial inventory of tritium for early fusion power reactors were investigated with a calculation model. The results of calculated time-dependence of tritium inventory were examined, in particular from the following three points of view; the doubling time of tritium inven…
The influence of the composition and the casting process upon the electrochemical corrosion of a selection of palladium-based alloys and non-precious metal alloys has been investigated in vitro using an electrochemical method. No influence of the casting process upon the corrosion resistance was observed with palladiu…
Abstract This paper presents the possibility of using the reverse magnetostriction (Villari) effect in fatigue testing of ferromagnetic materials. The tests were conducted on cyclically loaded nickel with no auxiliary external magnetic field. The following properties were determined: magnetic induction B , magnetic fi…
The feasibility of the laser surface alloying of magnesium base alloys with aluminum, copper, nickel and silicon has been shown in this work. By laser alloying with these elements, using a 5 kW CO2-laser, the hardness of several magnesium base alloys can be increased to values above 250 HV0.1. Melted depths from 700–1…
Other| December 01, 1996 The structure of ordered and disordered lead feldspar (PbAl2Si2O8) Piera Benna; Piera Benna Universita di Torino, Dipartimento di Scienze Mineralogiche e Petrologiche, Turin, Italy Search for other works by this author on: GSW Google Scholar Mario Tribaudino; Mario Tribaudino Search for other…
Thanks to the study of model compounds, we have been able to determine the origin of three rheological transitions observed in the thermomechanical analysis of a crosslinked nadimide resin, in the thermal range (-150 °C–-400 °C). The first one, localized at about 300 °C, is attributable to the glass transition of the…
In this paper, we have pioneered a new direction concerning the shielding of electronic devices (at a microcircuit-packaging or a larger level) in a radiative environment. As a matter of fact, this work not only considers the role of the material itself on the shielding efficiency but also the effect of the structure…