Materials Literature
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Experimental measurements of shape memory alloys wires Paper deals with examinations of properties of shape memory alloy actuators. Authors describe design of own laboratory stand for obtaining electro-thermo-mechanical characteristics of SMA wires (maximum length 900 mm). The stand allows for semi-automatic measureme…
5A06 aluminum alloy welding was obtained by using SAlMg-3 as welding wire with MIG (metal inert gas arc welding). The welded joint with deep cryogenic treatment at liquid nitrogen temperature (-155) for 4h, 8h, 10h were analyzed by metallographic and XRD examination. The results have shown that a lot of subgrain appea…
Poly(p-phenylene benzobisoxazole)/poly(pyridobisimidazole) block copolymers (PBO-b-PIPD) were prepared by introducing poly(pyridobisimidazole) (PIPD) moieties into the main chains of poly(p-phenylene benzobisoxazole) (PBO) in order to enhance its photostability. PBO and copolymer fibers were directly prepared from the…
We study phonon interference in some ring-type structures theoretically. The phonon transmission minima due to interference are discussed. We find that, by introducing a ring-type structure to a one-dimensional system, the phonon thermal conductance can be reduced by about 50%. This may be used to control phonon heat…
This paper is concerned with the propagation of Lamb waves in double-layered nanoplates and a nonlocal continuum model is presented. Each layer of the double-layered nanoplates is coupled through the van der Waals interaction. The equations of wave motion are derived and dispersion relations are obtained. The present…
The electronic properties and stability of Li-doped ZnO with various defects have been studied by calculating the electronic structures and defect formation energies via first-principles calculations using hybrid Hartree-Fock and density functional methods. The results from formation energy calculations show that Li p…
Insulation failure in power systems plant may be caused by manufacturing defects or by electrical, mechanical, thermal and chemical process which occur during operation. These processes create defects, including voids in solids, which locally reduces the dielectric insulation strength. Electrical discharge may occur i…
Abstract Summary: Thick bulk films of linear amorphous polymers with different chain architecture and molecular weight were brought into contact with themselves in a lap‐shear joint geometry at bonding temperatures ( T ) below the glass transition temperatures of their bulk ( T ), at a small contact pressure, in order…
Dye-sensitized solar cells (DSSCs) have demonstrated considerable potential due to their solar energy conversion efficiency and their fabrication from relatively low cost materials. Titanium dioxide (TiO2) nanoparticles are widely used in the fabrication of the DSSC electrodes. There is a considerable energy requireme…
Abstract Properties of both amorphous and polycrystal films of azodye AD‐1 have been investigated. The films' structure depends on conditions of thermal treatment, light polarization and intensity. High dichroic ratio (>20) has been obtained. Film structure control allows fabrication of good photoaligning coatings.
In this article, silver-polyethylene oxide (Ag/PEO) biocompatible nanocomposite (BCNC) were successfully green synthesized by mixture containing low MW PEO, silver nitrate and by UV-irradiation at room temperature. The initially broad and asymmetric surface plasmon resonance (SPR) band was narrowed and blue-shifted as…
Mesoporous photocatalysts of CeO2/SBA-15 are prepared by two methods of direct synthesis as solvent-usage and solvent-free methods. In solvent-usage method, CeO2/SBA-15 is synthesized in acidic media. While, in solvent-free method, CeO2/SBA-15, has been prepared through the novel path of directly grind cerium salt int…
Induction motors are widely applied in industry. Their performance strongly depends on relative power supply quality, such as voltage sags, harmonics, voltage unbalance and voltage fluctuations. This paper investigates the impact of voltage fluctuations on induction motor performance, particularly the stator and rotor…
Graphene as a material has created a lot of interest due to properties like high saturation velocity, high current carrying capacity, ambipolar characteristics and high transconductance. These properties make graphene based transistors a promising candidate for high frequency applications. Recently, there have been de…
In the study of the solution-solid phase equilibrium in CuX 2 -S-H 2 O system (X = Cl, Br, S = dimethyl sulfoxide, N , N -dimethylformamide, tetrahydrofuran, 1,4-dioxane) at 25°C we established the effect of the solvent properties and the type of the halide ligand (dielectric premeability, donor number, hydrophobicity…
Using sodium tungstate and cesium carbonate as raw materials, cesium tungsten bronze (CsxWO3) powders were synthesized by low temperature hydrothermal reaction with citric acid as the reducing agent. The CsxWO3 films were prepared on glass using polyvinyl alcohol solution as dispersing agent. The microstructure and mo…
Abstract The effect of annealing treatments and thermomechanical cycling on the transformation behaviors and shape memory effect of Ti 48.5 Ni 48 Fe 2 Nb 1.5 shape memory alloys were investigated using electrical resistivity measurement and tensile testing. It is found that the transformation behaviors are influenced…
Relaxors with general formula AA'BB'O 3 with different cationic distributions at A/B-sites have important device applications in capacitors, piezoelectric ultrasonic transducers, electrostrictive actuators, SAW substrates, etc. The doping or compositional changes in these ceramics can control the high electromechanica…
The strength of the electron-phonon interaction is most straightforwardly determined from electron energy relaxation times, provided that an appropriate relaxation scheme is assumed. We use literature data from fs spectroscopy on materials with different strengths of electron-phonon interaction to show that the common…
A mechanical measurement technique was investigated to correlate the degree of cross-linking in laminated ethylene vinyl acetate (EVA) solar module encapsulation with the cured EVA shear response by means of a dynamic mechanical analysis (DMA) measurement. The technique was demonstrated on sample disks fabricated with…