Materials Literature
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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…
This chapter provides a comprehensive discussion of principles, theories, and techniques of liquid-phase sintering. The process is used to produce a wide variety of ceramics and is particularly effective for ceramics with a high degree of covalent bonding that are normally difficult to densify by solid-state sintering…
Recently, ferroelectric random access memory has drawn a great deal of attention due to inherent properties such as nonvolatility, long retention time, high endurance, fast access time, small cell size compared to DRAM cell size in principle, and strong resistance to /spl alpha/-particle and cosmic ray irradiation. No…
Digital feedback technique has advantages of good reproducibility of waveform due to no human error and of no oscillation in control process compared with analog technique. However, it may require many iterations of feedback, especially at higher flux densities, because a considerably distorted voltage waveform should…
Thermally stimulated polarisation (TSPC) and depolarisation current (TSDC) techniques were used to study polarisation and conduction in xFe 2 O 3 (100-x) P 2 O 5 , (14≤x≤47) glasses. TSDC peaks located between 196 and 262 K were attributed to polarisation caused by intrinsic dipolar defects. Electronic conductivity wa…
3Y-TZP/20 mass% La {Co0.5Fe0.5(Fe0.9Al0.1)11}O19 composites were successfully synthesized in situ during sintering from a mixture of 3mol% Y2O3-ZrO2, La(Fe0.9Al0.1)O3, Fe2O3, Al2O3 and CoO powders. Platelike La{Co0.5Fe0.5(Fe0.9Al0.1)11}O19 crystals were grown stably in a 3Y-TZP matrix over a temperature range of 1200…
A new method of pinpointing dielectric fluid leaks on pipe-type and self-contained power cables using perfluorocarbon tracer (PFT) is presented. The method has successfully been used on the Con Edison transmission system to locate leaks of dielectric fluid on both types of cables. Application of the PFT technique does…
A hysteresis curve of AC magnetostriction was measured, magnetizing a grain oriented silicon steel in the direction deviated from rolling direction of the sample. The AC magnetostriction curves were analyzed as harmonics in the interest of noise spectrum of such as a power transformer. The domain structure model in th…
A tridimensional finite element model of isothermal pseudoelastic deformations is proposed in order to analyze and predict the behavior of shape memory alloys (SMA). To perform finite strain calculations, the mechanical modeling is based on a formulation in a non material rotating frame. The constitutive equations in…
BaAl 2 O 4 /aluminum‐bearing composites have been synthesized via the low‐temperature oxidation of Ba‐Al precursors. Ba‐Al powder mixtures that were prepared via high‐energy vibratory milling were uniaxially pressed into bar‐shaped specimens that were then exposed to a series of heat treatments in pure, flowing oxygen…
A carbon conductive film consisting of nanometer sized domains has been patterned by scanning photoablation of polystyrene. The film formation involves the photoablation of a highly insulating polymer, and the redeposition of conductive carbon fragments. This film has been investigated by scanning electron microscopy,…
Two types of crystalline approximants of the decagonal phase have been found in the Al-Cu-Cr system by electron microscopy, in specimens annealed at 1050°C. The structures are orthorhombic with lattice parameters of a = 1.48 nm, b = 1.26 nm, c = 1.27 nm, and base-centered orthorhombic with lattice parameters of a = 2.…