Materials Literature
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The development of a position control system for a shape memory alloy (SMA) wire actuator using an electrical resistance feedback is presented in this paper. A novel control scheme is implemented to eliminate the need for a position sensor to achieve stable and accurate positioning by utilizing the actuator's electric…
Studies of n-CdZnTe crystals (photoluminescence, extrinsic photoconductivity, Hall effect, time-of-flight technique) have shown that the excess concentration of vacancies of cadmium (Vcd) is the main reason of low, as a rule, values of product of mobility to life time of holes (mhth). The reduction of the concentratio…
We study the magnetic properties of metallic GaMnAs. We calculate the effective RKKY interaction between Mn spins using several realistic models for the valence band structure of GaAs. We also study the effect of positional disorder of the Mn on the magnetic properties. We find that the interaction between two Mn spin…
Devising a computational tool that assesses the thermodynamic stability of materials is among the most important steps required to build a ``virtual laboratory'', where materials could be designed from first-principles without relying on experimental input. Although the formalism that allows the calculation of solid s…
Araneoid spiders use specialized abdominal glands to produce up to seven different protein-based silks/glues that have diverse physical properties. The fibroin sequences that encode aciniform fibers (wrapping silk) and the mechanical properties of these fibers have not been characterized previously. To gain a better u…
Novel one-component phosphors, Cd 1 - x Dy x SiO 3, which emit white color long-lasting phosphorescence upon UV light excitation, are prepared by the conventional high-temperature solid-state method and their luminescent properties are systematically investigated in this paper. XRD, photoluminescence, long-lasting pho…
Abstract The mechanical properties of multiwall carbon nanotube (MWNT)/poly(methyl methacrylate) (PMMA) nanocomposites were studied as a function of nanotube orientation, length, concentration, and type. Orientation and dispersion were assessed by electron microscopy. A processing parameter study revealed the robust n…
A superhydrophobic ZnO thin film was fabricated by the Au-catalyzed chemical vapor deposition method. The surface of the film exhibits hierarchical structure with nanostructures on sub-microstructures. The water contact angle (CA) was 164.3 degrees, turning into a superhydrophilic one (CA < 5 degrees) after UV illumin…
Abstract A detailed description of the displacive transformation mode of the formation of plate-like τ-phase in MnAl (containing a small amount of carbon) is given. The plate-like τ-phase forms in a stepwise mode from the ɛ-phase. Crystallographic correspondence is transmitted from the ɛ- to the τ-phase during the who…
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…