Materials Literature
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Abstract The size distributions and volume fractions of Ni 4 Ti 3 precipitates in Ni-rich Ni –Ti shape memory alloys affect their mechanical and functional properties. In the present work precipitate sizes and volume fractions were measured after various thermo-mechanical treatments using transmission electron microsc…
Conference: EUROMECH-MECAMAT'2003: 7th European Mechanics of Materials Conference on Adaptive Systems and Materials: Constitutive Materials and Hybrid Structures, 18-23 May, 2003 - Fréjus, France. C. Lexcellent and E. Patoor, eds.
This paper presents the results of two-dimensional studies on a range of different catalyst substrates warmed by exhaust from a four-cylinder gasoline engine. Engine speeds investigated were 2000 and 3000 r/min, corresponding to frequencies of 67 and 100 Hz. Of the nine substrates investigated, four were washcoated bu…
To investigate the effect of D-ferrite on the hot workability and surface defect of STS 304 billets containing 3 wt. % Cu, microstructure observations and high temperature mechanical properties test were carried out for the specimens extracted mainly from raw or oxidized billets. It was found that the total <TEX>$\del…
Simultaneous measurements of remote electron beam induced current (REBIC) and orientation imaging microscopy (OIM) in a scanning electron microscope (SEM) have been applied to a polycrystalline (Ba 0.6 Sr 0.4 )TiO 3 with a positive temperature coefficient of resistivity (PTCR) to elucidate a grain‐boundary character d…
Diffraction of an obliquely incident TE-polarized Gaussian beams by N equally spaced slits (finite grating) with conducting substrate is treated. The substrate can be either vacuum or conductor. The diffracted and scattered patterns, the transmission and reflection coefficients, and the normally diffracted energy are…
The second generation liposomal anticancer drug is characterized by long-circulating half-life, which leads to passive tumor targeting and improved antitumor activity. Its development is based mainly on the surface coating of polymers and thus reducing its clearance from reticuloendothelial system. Is it possible to f…
Natural alunite and kaolin minerals obtained from West Anatolia were investigated by electron paramagnetic resonance (EPR) in natural and γ-irradiated states at room temperature and at 113 K. The paramagnetic centres at ambient temperature in natural alunite were attributed to the ĊH2OH, , , and [AlO4]0 radicals. In n…
Magnetic material with first order phase transition has been studied from the view point of magnetic refrigerant. Gd/sub 5/(Si/sub x/Ge/sub 1-x/)/sub 4/ has field induced metamagnetic transition, whose temperature can be varied by changing Si concentration. It was shown that suitable transition temperature for hydroge…
Samples of interstitial free (IF) steel buried in MgO castable bonded by calcium aluminate cement (CA) in graphite crucibles were heated at 1600°C for 90 min. Total oxygen content (TOC) of the steel was examined after heating and the refractory was investigated by SEM and EDS. It was found that TOC was higher in IF st…
Apesar dos processos de polimerização em suspensão e emulsão serem processos heterogêneos, cada um origina características peculiares para a distribuição de tamanho de partículas, distribuição de pesos moleculares, taxa de nucleação das partículas de polímero, taxa de polimerização, entre outras. Neste trabalho, são r…
Chilled samples of base iron and magnesium-treated iron were surveyed using optical microscopy, SEM and computer assisted microanalysis. Numerous voids, 0.5–1 m m in size, were observed in magnesiumcontaining chilled samples. Graphite spheroids at an early stage of growth, 3–5 m m in size, and inclusions were also obs…
Curie temperatures are evaluated using first principles in (K,Zr) 2 S and (K,Nb) 2 S diluted magnetic semiconductors which have been designed as half-metallic and transparent materials with a large magnetoptical effect. From the total energy differences between the ferromagnetic state and the spin-glass state, estimat…
Abstract Summary: A hard‐segment homopolymer (HSH) and segmented poly(ester urethanes) (PESU) were studied by TEM to estimate their stability against electron‐beam irradiation. The bright‐field image and electron‐diffraction modes in TEM and optical polarised microscopy were used. It is shown that both soft and hard s…
In order to recycle the abandoned Nd–Fe–B sintered magnets, we attempted to develop a high coercive magnetic powder for bonded magnets from the Nd–Fe–B sintered magnet scraps. It was found that the coercivity of the powders obtained from the Nd–Fe–B sintered magnet scraps could be fully recovered by the thermally acti…
Dielectric properties of polycrystalline CaCu/sub 3/Ti/sub 4/O/sub 12/ (CCTO) pellets sintered in the temperature range 1000-1200/spl deg/C were evaluated with impedance spectroscopy at frequency range of 10/sup 2/ to 10/sup 7/ Hz from 90 K to 294 K. A correlation has been established between the pair values of low fr…
Nous avons resolu la structure cristalline de la turanite, Cu 2 + 5 (V 5 + O 4 ) 2 (OH) 4 , provenant de la localite type, le gisement de Ra-U de Tyuya-Muyun, cretes d'Alai, district de Osh, au Kyrgyzstan, triclinique, groupe spatial P1, a 5.3834(2), b 6.2736(3), c 6.8454(3) A, α 86.169(1), β 91.681(1), γ92.425(1)°, V…
On single crystals of austenitic stainless steel with nitrogen C N =0-0.5 wt.% the stages of stress-strain curves, work-hardening coefficient, deformation mechanism - slip and twinning, the developing of dislocation structure in dependence on crystal tensile axis orientation, test temperature, nitrogen concentration h…
Recently, electrical resistivity (ER) measurements have been done during some thermomechanical tests in copper based shape memory alloys (SMA's). In this work, single crystals of Cu-based SMA's have been studied at different temperatures to analyse the relationship between stress (s) and ER changes as a function of th…
Abstract 21,23-Dithiaporphyrins and 21-monothiaporphyrins with propane-1,3-diyldioxy and its derivatives at the β-thiophene carbons were synthesized and characterized. The cyclic substituents introduced at the β-thiophene carbons altered the electronic properties of the porphyrins. The X-ray structure for 2,3-bis(2,2-…