Materials Literature
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Species of the diatom genus Thalassiosira are an important component of the marine phytoplankton all over the world, and the Mexican Pacific Ocean planktonic flora is also rich in species of this genus. In this study 37 net plankton samples from the Gulf of Tehuantepec, Mexico were analyzed, yielding 23 taxa of the ge…
This article deals with the efficiency of using styrene (St) as a comonomer to promote the melt free radical grafting of glycidyl methacrylate (GMA) onto an ethylene and propylene rubber (EPR) in a batch mixer and a corotating self-wiping twin screw extruder. The addition of St to an EPR/GMA/peroxide system increases…
Bicomponent fibers were wet-spun from soybean protein and poly(vinyl alcohol). The protein core of the spun bicomponent fiber was brittle and showed a high frequency of core breakage upon drawing. Our effort was then to study the soybean protein solution, with the aim of trying to understand the cause for fiber brittl…
A new sampling device is used to perform near-real-time investigations of physical and chemical processes occurring inside a laboratory twin-screw extruder. Polyamide-6–ethylene propylene rubber (PA-6–EPM) blending and styrene–maleic anhydride (SMA) imidation experiments are reported in terms of morphology development…
In this work, an impact copolymer polypropylene (ICPP) was separated into 4 fractions, A, B, C, and D. The phase structure, thermal behavior, and crystalline morphology of the ICPP and its 4 fractions were studied thoroughly using scanning electron microscopy (SEM). Dynamic mechanical analysis (DMA), differential scan…
In this work, impact copolymer polypropylene (ICPP) was fractionated into 4 fractions. ICPP and the 4 fractions were studied using Fourier transform infrared and 13C nuclear magnetic resonance analysis. The results demonstrate that fraction A is ethylene–propylene rubber, fraction B is ethylene–propylene (EP) segmente…
A series of CeO2-CaO-P2O5 glasses containing up to 35 mol% CeO2 are studied by IR and Raman spectroscopy. The spectra evaluation shows close correspondence between the IR spectra obtained and these of ultra, meta and ortho phosphates of light lanthanides. Raman spectra also evidence the formation of polymeric structur…
Polycrystalline α-alumina matrix composite fiber dispersed with YAG (yttrium-aluminum garnet, Al5Y3O12) particles have been prepared by sol-gel process using α-alumina fine seed particles. The α-alumina seed particles accelerated the crystallization of alumina matrix from θ to α phase resulting in composite fibers wit…
The contribution of the unique magneto-optical structure with the MnSb and MMnSb (M=Au, Pd) phases to the magneto-optical spectra of the composites films with various MnSb-MMnSb volume fraction was discussed in connection with the dielectric tensor analysis. As results, it was found; (1) The Mn-Sb-M (M=Au, Pd) films a…
Starting from aluminium rod stock and dopant salts, hydrothermal synthesis of pure and doped alumina powders in the temperature range of 300°-550°C and pressure range of 20–150 MPa is described.
The embedded atom method (EAM), where a highly accurate empirical inter-atomic potential calculation is possible in comparison with the two-body pair potential, is used for the molecular dynamics (MD) simulation. Parameters are fitted for Al and Cu so as to reproduce the metal properties such as elastic constants (C11…
When an alternating current flows through a ferromagnetic wire, its thermal output is higher than predicted by the familiar Joule law. An additional contribution arises from the heat liberated due to the hysteresis loss in the self-induced magnetic field inside the wire. Simple calculations, based on the formulae deri…
In order to conserve the energy resources and to reduce the dependence to oil, the large coal fired power plant which was improved heat efficiency has been currently developed. A very effective method of improving the heat efficiency of steam power plant is the raise of steam conditions. It is important to develop the…
Our recent calorimetric studies on glass transition, especially for high pressure experiments, are reviewed in this article. The materials examined are molecular liquids with relatively simple molecular structure. The content of the article is as follows. (1) Introduction (2) Adiabatic Calorimeter under High Pressure…
Unlike the determination of skin roughness, the determination of skin gloss has as yet been given little attention. Recent books on examination techniques for human skin contain nothing on this subject [1–4]. This maybe connected with the fact that no methods exist for an objective assessment of skin gloss. Gloss meas…
Simultaneous synthesis and densification of α-Zr (N) (hexagonal) from zirconium powder compacts are achieved by self-propagating combustion under high nitrogen pressures. Nitrogen contents increase from 12.2 to 23.5 at% with decreasing compacting pressure and increasing nitrogen pressure. The material with the highest…
This paper considers the efficiency of electrostatic charging of water-sprayed fibers during the melt-blowing process. Two charging methods were used to charge the fibers near the die exit and the fabrics after the collector. Both showed that the charging efficiency was not affected by the water-spraying process if th…
Sheets from blends containing liquid crystalline polymer (LCP) and bisphenol-A polycarbonate (PC) were prepared using a twin screw extruder at various take-up speeds. Thermal behavior, mechanical properties, and viscoelastic properties of sheets with various compositions were investigated using differential scanning c…
Catalytic effect of metal ions: Cr(VI), Cr(III), Cd(II), V(V) and chloride anion, on the oxidation of S(IV) in aqueous solution, at concentrations of metal ions and S(IV) usually found in urban atmospheres, were studied under controlled experimental conditions (pH (2.1 - 4,5), T (25.0 - 35.0 °C), air flow rate, concen…
The development of a practical solid oxide fuel cell (SOFC) requires an improvement in cell performance and a manufacturing technology suitable for mass production. In particular, tubular type SOFC is thought to be superior in its reliability because the configuration avoids high temperature sealing and reduces the th…