Materials Literature
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Phospholipase D (E.C. 3.1.4.4) from Streptomyces antibioticus has been crystallized in six crystal forms using the hanging-drop vapour-diffusion method. The type III and V crystals belong to monoclinic and hexagonal systems, respectively. All of the other crystal forms, types I, II, IV and VI, belong to orthorhombic s…
An experimental visual observation and theoretical study were carried out to investigate the dynamic behavior of bubble nucleation and growth in a foam extrusion die. In this study, a mixture of polypropylene and isobutane was extruded through a slit die with glass windows, and gas bubbles in the flow channel were obs…
Using single phased Ce2Fe17 and Lu2Fe17 with the rhombohedral Th2Zn17-type and Th2Ni17-type structure, respectively, we performed measurements of magnetization and resistivity under various magnetic field up to 5.5T. Ce2Fe17 exhibits a simple helical spin structure with a wave vecter of τ= 0.0372 Å-1 parallel to the c…
The determination of ferroresonant oscillations in circuits with voltage transformers is a highly nonlinear problem due to the possible core saturation. It is achieved with an algorithm based upon the harmonic balance method in the frequency domain. Advantages over a time domain description are discussed. Branches of…
The inhibitive effect of thiourea, 2-amino [4-p-chlorophenyl] thiazole and different derivatives of their condensation products, N-2[4-pchlorophenyl] 2-thiazolyl] thiocarbamide on the corrosion of mild steel in 20% formic acid solution has been studied using weight loss and electrochemical polarisation techniques. Dif…
Structural and magnetic properties of the Y(Fe1-xCox)11Ti compounds have been investigated. Substitution of Co for Fe does not change the crystal structure, but leads to a decrease of unit-cell volume. The Cure temperatures Tc increase clearly with increasing Co content. Composition dependence of the Curie temperature…
Effect of grain size on the threshold stress for high strain-rate superplastic aluminum alloys was investigated. By taking account of the grain-size effect on threshold stress with the solidus temperature, it was demonstrated that the threshold stress data for many superplastic aluminum alloys with different grain siz…
An austenitic stainless steel 316LN irradiated to damage levels of about 3 dpa at irradiation temperatures of about 90°C and 2 50°C has been examined by transmission electron microscopy. The irradiation at 90°C and 250°C induced a dislocation loop density of 3.5 × 1022 m−3 and 5.2 × 1022 m−3, and a black dot density o…
La DNPA a trouv de trs nombreuses applications en science des matriaux, de la mise en vidence d'volutions structurales dans des alliages industriels aux tudes fondamentales de sparation de phases. Permettant la caractrisation d'inhomognts de taille comprise entre quelques distances interatomiques et prs de 1 pm, cette…
Several polysilanes with different overall functionalities have been synthesized and pyrolyzed to produce porous silicon carbide. The polysilanes and their ceramic products have been characterized using gel permeation chromatography, Fourier transform-infrared spectroscopy, thermogravimetry, X-ray diffractometry and m…
The Zr3d spectrum in the XPS measurement of PZT ceramics was found to vary according to their crystalline phases. The Zr3d spectrum of the rhombohedral phase was deconvoluted to the Zr3d5/2 profile at 181.3±0.2eV (denoted as A1) and the Zr3d3/2 profile at 183.6±0.2eV (A2), corresponding to a single chemical state. In…
The use of rioe bran oil as a processing aid in styrene butadiene rubber has already been Investigated in this laboratory . Based on the encouraging results obtained from this study, we thought also of trying this oil inrubbers like nitrilebutadiene(NBR) and polychloroprene (CR) . In this study an attemptis madeto see…
An effective medium approximation is given for single-particle hopping in lattices with site energy disorder. Based on this approximation the frequency dependent diffusion coefficient is calculated for a uniform distribution of site energies and the results compared with Monte Carlo simulations. Although the approxima…
This paper covers investigation results on electrical and mechanical properties of crosslinked polyethylene (XLPE), used as electrical insulation of medium voltage power cables, under thermal ageing stress. The authors have carried out continuous accelerated thermal ageing of cables at four levels of temperatures rang…
This study is aimed at understanding the fundamental mechanism of the embrittlement process in low alloy, reactor pressure vessel steel in a neutron irradiation environment. It has previously been considered that the radiation environment may induce the increment of the ductile-brittle transition temperature, which is…
For selected carbohydrate-modified Silicon surfactants of the siloxane, carbosilane, polysilane and silane type, the concentration dependences of the liquid/vapour and solid/liquid interfacial tensions under equilibrium conditions have been determined. Further, the Lifshitz–van der Waals and donor–acceptor contributio…
The reactions of the water soluble complex FeIII(TPPS) [TPPS = 5,10,15,20-tetrakis(p-sulfonatophenyl)porphyrinate] with peroxomonosulfate, hydrogen peroxide and sulfite/oxygen have been investigated kinetically as a function of reactant concentration and pH. The spectral changes recorded for the reactions between the…
Results of X-ray diffraction measurements of metaphosphate glasses with modifier atoms Me = Zn, Mg, Sr, Cd, Pb, Li are presented where the contrast with neutron diffraction data and the high real-space resolution from using photons of more than 100 keV are exploited.
Isotactic polypropylene consisting of uniaxially oriented P-phase lamellae was crystallized in a temperature gradient. The β → α transition was investigated by simultaneous measurements with differential scanning calorimetry (DSC) and X-ray diffraction using synchrotron radiation (SR). To compare the transition mechan…
The aging behavior (microstructural evolution and mechanical properties change) of a 25%Cr-7%Ni-3%Mo duplex stainless steel at 873 K was investigated. A very short term (3.6 ks) aging treatment caused a significant decrease of impact toughness before the formation of σ phase. Quasi-stable R phase was observed to form…