Materials Literature
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Model of heat and mass transfer in catalytic cathode layers of air–hydrogen fuel cells is developed on the basis of experimental data on the layers’ structure. The effect of carbon nanotubes is analyzed: their introducing into the catalytic layer increased the layer’s porosity. The derived analytical expressions allow…
In contrast to isothermal aging, few reports document the non-isothermal aging of deformed Al–Mg–Si alloys. The knowledge of non-isothermal aging of pre-deformed Al–Mg–Si alloys is of primary importance to understand the thermal stability as well as to control the microstructure of the final product during industrial…
Diffusion bonding process of aluminium 1070A concerning production of microchannel heat exchangers (MCHE) has been investigated. It has been proposed to raise manufacturability of the process owing to introduction into contact zone of joining details composition on the basis of sodium silicate before welding. The resu…
Collaboration with the Electricity Authority of Cyprus (EAC) and the University of Cyprus (UCY) has allowed development of an experiment in a distribution substation. Temperature condition monitoring units were installed on selected underground cable joints within MV sub-station in Cyprus. Real-time current loading da…
We prepared polymethyl methacrylate (PMMA) beads with a particle size of 80 nm to improve the energy conversion efficiency (ECE) by increasing the effective surface area and the dye absorption ability of the working electrodes (WEs) in a dye sensitized solar cell (DSSC). We prepared the TiO2 layer with PMMA beads of 0…
The data on thermal stability under argon atmosphere of a series of porphyrin ligands containing meso- and β-positioned electron-donor (Me, Et, or Ph) groups as well as electron-acceptor pyridinyl substituents differing in the heteroatom location are presented. Thermogravimetric analysis and electron absorption spectr…
The influence of borosilicate (BS) addition on the mechanical properties and sinterability of yttria-stabilized zirconia (8YSZ) was investigated using scanning electron microscopy (SEM) and Vickers-hardness test. Undoped and 0.5-10 wt.% BS-doped 8YSZ powders were prepared using a colloidal process. The powders were th…
In this paper the effect of spark-plasma sintering parameters on the microstructure and mechanical properties of tungsten heavy alloys VNZHK-90 and VNZHK-93 are studied. The basic dependences of the density and strength characteristics from the sintering temperature and velocity are shown. Conclusions about the depend…
Electro-optic coefficients of variations in the refractive index of PZT and PLZT ceramic materials induced by ac electric field are estimated using modulation of reflected light. The electro-optic coefficients of PLZT ceramics measured with the aid of conventional birefringence using the phase shift of transmitted rad…
An investigation of electronic property and high pressure phase stability of SmN has been conducted using first principles calculations based on density functional theory. The electronic properties of SmN show a striking feature of a half metal, the majority-spin electrons are metallic and the minority-spin electrons…
The electric response of layered 2-2 connectivity magnetoelectric composites to the action of a modulated heat flow, which is detected by a dynamic method, is studied. The kinetics of the pyroelectric response of the composite material to a pulsed thermal action is calculated. The experimental results and calculation…
The effective thermal conductivity of samples of cryocrystal nanocomposite obtained from argon and SiO2 nanopowder was determined in the temperature interval 2–35 K using the steady-state method. The thermal conductivity of crystalline argon with nanoparticles of amorphous silica oxide embedded in its structure shows…
Large-scale, rod-like nanostructures of LaPO4:Eu3+ phosphors were synthesized using a simple hydrothermal method. The phase composition, structure and morphology of the final products were characterized by XRD, FE-SEM and TEM. Highly crystalline material was obtained as confirmed by X-ray powder diffraction measuremen…
The carbon nanotube (CNT)-based materials can be used as vacuum device cathodes. Owing to the excellent field emission properties of CNT, it has great potentials in the applications of an explosive field emission cathode. The falling off of CNT from the substrate, which frequently appears in experiments, restricts its…
This paper employs rigid-plastic finite element DEFORMTM 3D software to estimate the plastic deformation behavior of an aluminum billet during its axisymmetric extrusion through a conical die. The die and container are assumed to be rigid bodies and the temperature change induced during extrusion is ignored. The impor…
Rare earth ions (Tb3+, Eu3+) doped CaWO4 microstructures were synthesized by a facile hydrothermal route without using any templates and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectrum. The results indicate that the asprepared samples are well crystalliz…
Summary Growth and pigment composition of both the skeleton‐bearing and naked forms and toxicology of the naked form of Dictyocha octonaria were studied here using clonal cultures derived from a single cell from Wellington Harbour. In this study both the naked and skeleton‐bearing forms showed optimum growth between 1…
Magnetoresistivity and filamentary superconductivity in nickel-doped BaFe2As2* , Zhang, Wei, Dai, Yao-Min, Xu, Bing, Yang, Run, Liu, Jin-Yun, Sui, Qiang-Tao, Luo, Hui-Qian, Zhang, Rui, Lu, Xing-Ye, Yang, Hao, Qiu, Xiang-Gang
Icosahedrons in supercooled liquids and glasses are considered to be of significance for the glass formation in alloy systems. Starting from the similarity of the local structure of quasicrystals to the icosahedrons in metallic glasses, a scheme is put forward to prepare metallic glasses based on a well-known quasicry…
Epoxy resin (EP) modified polyurethane prepolymer (PUP) was prepared by synthesizing prepolymer method, and then EP/PU interpenetrating polymer networks (IPN) composites was produced with better adhesive properties as the foam expands further. The effects of the process on graft reaction and spatial structure of EP/PU…