Materials Literature
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A metamaterial design is presented that implements a far-field collimating lens for microwave antenna gain enhancement applications. Using a combination of dual-split ring resonators and end-loaded dipole meta-molecules, the bulk properties are shown to be a good approximation of a low-index uniaxial material with a z…
Abstract Thin films of polyester‐based polyurethane‐silica nanocomposites with 34% hard segments and different concentrations of nano SiO 2 filler (0, 0.5, 1.0 and 3 vol.%) have been prepared. The hydrogen bonding and orientational behaviour of hard and soft segments were analysed using infrared linear dichroic measur…
The PLA/Rice straw fiber composites with various content ratios were prepared by using an internal mixer and a flatten press. The thermal properties, interface effect and mechanical performance of as-prepared PLA/Rice straw fiber composites were studied by mechanical performance measurement, TG, DSC and SEM technique.…
Hardfacing is one of the most useful and economical ways to improve the performance of components submitted to severe wear conditions. In this paper, a new kind of alloy called Fe-Cr-C-Nb/Ti alloy system for wear resistant successfully with the shielded metal arc welding (SMAW) method has been studied. The microstruct…
This paper presents the mechanical behavior of advanced high strength steel, Dual Phase 1200 steel (DP1200) at high strain rates (250s -1 - 750s -1 ) under tensile loading. The mechanical behavior of materials depends on the loading rates. The accurate knowledge of the mechanical behavior of materials at high strain r…
Through the use of a high-pressure modification of the spark plasma sintering method, it was possible to consolidate functional oxides (yttria- stabilized zirconia and doped ceria) to high densities and retain a grain size of < 20 nm. The role of the pressure on densification and on the grain size of the sintered s…
Ti-Nb alloys were prepared by powder metallurgy. Their microstructures are detected by the XRD diffraction and are observed using an optical microscope. The mechanical properties are tested using a dynamic mechanical analysis (DMA) Q800 from TA Instruments in single cantilever mode and using a 100 KN MTS testing machi…
Fluorine doped tin oxide (FTO) film is one of the most promising transparent conducting materials. It can be used for Low-E glasses, thin film solar cells, displays, etc. FTO film can be fabricated by various techniques. The technique of sol-gel combined with ultrasonic spray pyrolysis gives the possibility to produce…
Ultrasound irradiation (28 and 200 kHz) was applied to iron leaching from green tuff into a low temperature solution (20 °C) using oxalic acid. Ultrasound irradiation increased the amount of iron leached from the green tuff and was greater than that leached by stirring. It is thought that the jet flow caused by the co…
Preliminary data are reported concerning the character of magnetically ordered material particles formed in porous silicon matrix using a special chemical incorporation technology. According to this, the internal volume of a porous silicon matrix is filled with cobalt chloride, which is subsequently reduced to a magne…
Polysulfone functionalized with 1-[bis[3-(dimethylamino)-propyl]amino]-2-propanol was electrospun into nanofibers and then employed as a novel platform for the enrichment of Cu(II), Ni(II), and Pb(II) metal ions in aqueous solutions. Parameters affecting adsorption such as fiber diameter, contact time, and pH were inv…
Cation-promoted supramolecular assembly of cobalt(II) and ruthenium(II) tetra-15-crown-5-phthalocyaninates is comparatively studied using the electronic absorption and infrared spectroscopy. The effects of the nature of the receptor and substrate on the architecture of the supramolecular aggregates formed are discover…
The residual stress,which is unavoidable in the process of flash-butt-weld rails,plays important roles in the service life of the railway rails.However,knowledge of magnitude,direction,and sign of the residual stress is useful for maintenance and failure prevention.In this paper,we measured the residual stresses in th…
Formation of centers of electron-hole pair generation near the silicon-oxide interface under field and thermal effects on Si-MOS structures with ultrathin oxide and poststress annihilation of these structures are studied. Concentrations of generation centers of minority charge carriers (holes) are determined from expe…
Co-doped Bi 5 FeTi 3 O 15 thin films (BFCT- x , Bi 5 Fe 1- x Co x Ti 3 O 15 ) were prepared using a sol—gel technique. XRD patterns confirm their single phase Aurivillius structure, and the corresponding powder Rietveld analysis indicates the change of space group around x = 0.12. The magnetic hysteresis loops are obt…
It has been shown that difluoro(dibenzoylmethanato)boron ((dbm)BF 2 ) can be absorbed on silica gel in the form of fluorescent monomers and dimers with the emission properties that change in the presence of vapors of volatile organic compounds, such as ethanol, acetone, toluene, and meta -xylene. Fluorescence quenchin…
We investigated the electrical properties of the perovskite R(Cr,Mn)O 3 (where R is selected from various rare earth elements and Y), which is suitable for use in negative temperature coefficient (NTC) thermistors. The substitutions of Mn for Cr in La(Cr,Mn)O 3 and larger ions for R 3+ decreased both the resistivities…
We have investigated the isothermal and non-isothermal crystallization kinetics in molecular glasses in the system Ag 2 O-SeO 2 -MoO 3 with different modifier (Ag 2 O) contents. We have observed a change from two-dimensional to three-dimensional crystallization with the increase of the modifier content. We have shown…
Quantum chemical method PBE0/cc-pVTZ in conjunction with the polarizable continuum model (PCM) was applied to the calculation of the equilibrium structural parameters of the benzene and naphthalene 1,2,3-oxadiazole derivatives, as well as relevant diazocarbonyl compounds both in the free state and dissolved in dichlor…
In this study, the inhibition effect of different concentrations of benzidine possessing amine groups in its structure on the corrosion behavior of mild steel (MS) in 1.0 M HCl solution at 293 K temperature was practiced in both short and long immersion times by measuring electrochemical impedance spectroscopy (EIS),…