Materials Literature
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The second part of this work discusses the fabrication and testing of a fuel-powered shape memory alloy actuator system (FPSMAAS) and its main components. Fuel (propane) is burned in a combustor and its heat is transferred to a working fluid medium, which in turn transfers the heat to the SMA element to drive its mart…
Abstract Raman scattering from BiI 3 and SbI 3 crystals has been studied at hydrostatic pressures up to 2 GPa. The wavenumbers monotonically increased with pressure for all modes in BiI 3 . Although both crystals belong to the same space group, the pressure coefficients of SbI 3 were significantly different from those…
Silica–silver core-shell nanoparticles were produced using colloidal chemistry methods. Surface plasmon resonances in the silver shells were investigated using optical absorption measurements in ultraviolet-to-visible (UV-vis) spectroscopy and the effect of shell thickness on the wavelength of the resonance was noted.…
The title compound was synthesized in the form of a powder, and was studied by elemental analysis, IR spectroscopy, thermogravimetry and mass spectroscopy. Its crystal structure was then determined by X-ray powder diffractometry, using X-ray diffraction data collected in the reflection Bragg-Brentano geometry. The met…
Purpose This paper aims to study the dimensional characteristics such as fabric density variations, dimensional constant parameters, linear and area dimensional changes and spirality angle variations of 1 × 1 rib knitted structures made from cotton‐spandex core spun yarns, under laundering regimes till 10th washing cy…
The thermo-emf ΔV and thermoelectric current ΔI generated by imposing the temperature gradient (TG) alternating at a period of T on a thermoelectric (TE) generator were measured as a function of t, where t is the lapsed time and T was varied from 8s to ∞. The alternating TG was produced by switching a voltage of 2.6V…
Emission properties of an erbium organic complex embedded in a polymer matrix are investigated for laser and optical amplification applications in the 1550nm telecommunication range. The evaluation of stimulated emission cross sections is inferred from the Judd-Ofelt model [B. R. Judd et al., Phys. Rev. 169, 130 (1968…
The condensation of vapor chemical substances inside the nanometric structures of porous silicon is experimentally and theoretically investigated. The liquid phase covers the pore surface as a thin film and fills a volume fraction in the spongelike structure depending on the physical and chemical properties of each co…
Tetrahedral amorphous carbon (ta-C) film was prepared by the filtered vacuum arc process with Ar background gas. The residual compressive stress of the film decreased significantly as the Ar flow rate increased, whereas negligible change in the mechanical properties was observed. Structure analysis by Raman spectrosco…
General expressions for molecular frame photoelectron angular distributions (MFPAD) and the angular distributions of the recoil fragments relative to the electron emission direction, called 'the electron frame photoion angular distribution' (EFPAD), are analysed within the dipole approximation. We describe the project…
This paper reports a systematic study on indentation by a Vickers indenter and two-way shape memory in subsequent thermal cycling of a NiTi polycrystalline shape-memory alloy. It was found that, at a lower temperature, the indent is sink-in, while at a higher temperature, it is pile-up. However, after heating all inde…
Magnetization reversal via rotation is typical in ferromagnet/antiferromagnet exchange biased systems. The reversibility of the rotation is a manifestation of the microscopic reversal process. The authors have investigated the magnetization reversal in Fe/epitaxial-FeF2 thin films using vector magnetometry and first-o…
In this letter the authors studied the method to control the position of the generated defect on the slit of the patterned vertical alignment liquid crystal (LC) cell with dynamic stability. The authors modeled the LC director field with a defect on the slit and proposed an advanced wing pattern with a defect trap to…
Highly oriented single crystal Bi2S3 nanowire arrays are formed inside anodised alumina membranes (AAMs) using a new solventless approach. A high yield of pore filling is achieved by injecting the melted single source precursor liquid into the channels followed by thermolysis. The absorption profile (bandgap) of these…
Single crystal 6H-SiC wafers were fully amorphized at room temperature or 200K using 1.0 or 2.0MeV Au+ ion irradiation. The thickness of the amorphized layers has been determined using Rutherford backscattering spectrometry under ion channeling conditions. Microstructures of the irradiated SiC have been examined using…
The authors report the observation of a Griffiths-like phase in La2−2xSr1+2xMn2O7 (x=0.30, 0.33, and 0.40) and (La0.8Eu0.2)2−2xSr1+2xMn2O7 (x=0.33) single crystals by means of electron spin resonance, magnetic susceptibility, and magnetoresistance measurements. In the temperature region TC<T<350K, the re…
A quasi-static model for NiMnGa magnetic shape memory alloy (MSMA) is formulated in parallel to the Brinson and Tanaka thermal SMA constitutive models. Since the shape memory effect (SME) and pseudoelasticity exist in both NiTi and NiMnGa, constitutive models for SMAs can serve as a basis for MSMA behavioral modeling.…
The wide-band-gap zinc oxide-based diluted magnetic semiconductors currently attract considerable attention due to their possible use in spintronic devices. In this work, we studied ZnO nanowire samples synthesized on 10×10 mm2 a-plane sapphire substrates by high-pressure pulsed laser deposition. The samples were char…
The authors present density functional theoretical results of electronic and optical properties of wurtzite-type CdS and CdSe semiconductor nanowires and bulks. The results show that quantum confinement will increase the energy gap, decrease the dielectric function, change the sign of birefringence, and increase the a…
The electrical conductivity of a composite prepared by dispersing multiwall carbon nanotubes in yttria-stabilized tetragonal zirconia matrix, and subsequent spark plasma sintering, is studied. The dc conductivity of the composites follows a scaling law of the type σ∝(p-pc)t, yielding for the percolation concentration…