Materials Literature
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Legislation in most advanced industrial countries is demanding more stringent protection of the water table. Chemical spillage and the diffusion of chemicals into the ground, leading to contamination of water, is being strictly controlled. A good example of these regulations is the containment of spillages of gasoline…
Rare-earth alumino-silicate glasses were prepared from Shirasu (volcanic ash) and yttria concentrate as the main starting materials. Specific heats and elastic constants of these glasses were measured at room temperature. Using these values and previously measured values of thermal expansion coefficients and densities…
Summary The aim of this work is to promote a basic knowledge of the phenomenon of sensitisation in the heat affected zone (HAZ) in austenitic stainless steels and provide information on a method of desensitisation using laser beams without impairing other types of corrosion resistance (pitting corrosion resistance). S…
Elemental boron and boron nitride powders were mixed and pressureless-sintered in nitrogen. The structure and mechanical parameters of the ceramics were investigated and compared with those obtained from boron nitride powder free of the elemental boron. A positive effect of the addition of boron was found in increasin…
Explosive filling in small-calibre shaped charges is carried out by pressing techniques. At present, pressing is carried out by single action method which suffers a drawback of density gradient in the charge from the face of the tool. A new method-double action pressing-has been established which eliminates this probl…
It is well known that a high reflectivity mirror can be made by coating multiple pairs of dielectric thin films of high refractive index contrast and quarter wave optical thickness onto an optically flat surface. The advantages of a multilayer dielectric mirror over a metallic first surface mirror include high reflect…
The construction and operation of an electrochemical sensor capable of monitoring the corrosion performance of zinc alloy coated steel under controlled atmospheric conditions are described. Sensors were fabricated from zinc and zinc alloy coated steel sheet with and without chromate conversion treatments. Corrosion be…
The anodic oxidation and corrosion of α-brasses (13.2 and 32.2% Zn) were investigated in Na2SO4 solutions under different experimental conditions using cyclic voltammetric technique and complemented with X-ray diffraction analysis. The anodic responses of the brass display two potential regions. The first anodic regio…
The effect of ambient atmosphere on the sintering of oxides was studied ever since the first experiments on sintering of aluminium oxide spheres were married out Several effects of atmosphere on sintering have been found to be important. These depend on the nature of interaction, whether physical or chemical, of the a…
New chiral dopants containing an optically active six-membered ring with a cyano group were synthesized. New chiral dopants containing an optically active six-membered ring with an epoxy group were also synthesized and the effect of the direction of the dipoles on spontaneous polarization were discussed using them. Th…
Methods of purifying sepiolite-paygorskite series were reviewed and discussed under the two purification categories: extraction of elements and elimination of minerals.A number of previous works focused on the extraction of elements from sepiolite by acid treatment because knowledge gained from basic studies on dissol…
Torsion pendulum magnetometer measurements on ferrites and on neodymium-iron-boron permanent magnets are presented. The damping of the oscillation of the pendulum leads to information on the magnetic energy losses of the magnets in a small alternating magnetic field applied perpendicular to a bias field. The origin of…
The thermodynamic properties and volatility of SOFC materials is an important aspect in order to guarantee the necessary long term operation of an SOFC. Contributions to the SrO-Cr 2 O 3 -La 2 O 3 phase diagram were experimentally determined for the reducing and oxidizing conditions present in SOFCs. Moreover, the vap…
The effect of microstructure in silicon nitride on fracture toughness and Subcritical crack growth (SCG) behavior at room temperature was investigated. Three kinds of silicon nitride materials containing 5 mass% of Y2O3 and Al2O3 were sintered under different conditions, and they showed different microstructures. Frac…
Powder compacts with mullite composition (3Al2O3⋅2SiO2) were prepared by mixing γ-alumina and colloidal silica, followed by pressurized filtration. The compacts were sintered by means of viscous flow of amorphous silica phase at relatively low temperature (1200-1250°C) under various water vapor pressures with dew poin…
2014 La technique de mtallisation chimique par voie liquide est une alternative aux m- thodes classiques de mtallisation pour l'observation d'chantillons non conducteurs. Simple, rapide, conomique, cette technique apporte dans certains cas, en particulier pour les substrats tridimensio- nels, la solution aux problmes…
Abstract Single crystals of pure and monovalent metallic ion doped (K + , Na + , Cu + , Ag + , and Hg + ) lead(II)chloride and lead(II)bromide were grown using silica gel. The growth experiments have been carried out by employing a modified two‐stage chemical reaction. The grown crystals of pure and doped lead(II)chlo…
The phase behaviour of lateral substituted side group copolymethacrylates was investigated. With structural changes it is possible to influence the phase behaviour of the polymers. The lateral substituents have a stronger influence in side group polymers then in low molecular systems because of the coupling of the mes…
L-Ascorbate (0) reacted rapidly with sodium trimetaphosphate (STMP) at 20–25°C and constant pH 9.5–10.0 in the presence of calcium ion. Barium and strontium ions also catalyzed the phosphorylation reaction, but not magnesium ion. The optimum reaction mixture was initially 1.4 M L-ascorbate, 1.8 M STMP, 1.7 M calcium h…
Photodynamic therapy (PDT) is a promising approach for the treatment of cancer, and is presently being evaluated worldwide. PDT is based on the ability of photosensitizers to accumulate selectively in tumor tissue. On irradiation fluorescence of the sensitizer allows tumor localization. Singlet oxygen formed by sensit…