Materials Literature
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The structures of castings of 20GL and 20GFL steels have been investigated using metallography, as well as scanning and transmission electron microscopy. The correlation between the character of the structure and the level of mechanical properties has been established. It has been shown that a significant decrease in…
The active layer of the cathode of a fuel cell with polymer electrolyte (Nafion) is considered. The optimum carbon support structure is constructed using computer simulation: its carbon “skeleton” possesses the maximum outer surface area and provides electronic conductivity of the grains, support cubes, along the thre…
Development of green economy is the only way to relieve the restriction of resource, which is the effective and important way to improve economical benefit radically. Only in this way can continuable development be achieved. The research on pollution in printing industry was reported in this paper. The general polluta…
This study reports some different and efficient approaches for the aging temperatures which cause changes in the transformation parameters of porous NiTi (Ti-50.5 at % Ni) shape memory alloy (SMA) with porosity of 55.3% fabricated by self propagating high temperature synthesis (SHS). Changes which occurred in phase tr…
Interband and intersubband optical transitions in quantum wires are studied theoretically with allowance for scattering of carriers both by long-wavelength acoustic fluctuations and by a rough surface. The frequency dependence of the coefficient of light absorption is shown to be described by a bell-shaped curve, the…
Time-resolved vacuum ultraviolet (VUV) fluorescence was observed from a Czochralski method-grown Nd 3+ :LaF 3 crystal excited by 61 nm femtosecond pulses from the extreme ultraviolet free-electron laser (EUV-FEL). The 172 nm fluorescence peak exhibited double exponential fluorescence decay with slow and fast decay com…
We demonstrate that gold layers are a promising candidate for resistive heating actuation of liquid crystalline elastomers at moderate strains of around 10% and with good repeatability up to a few 10 kilocycles. These composites are easy to manufacture and have suitable resistivity to be actuated with low-voltage powe…
The paper presents an experimental investigation of using a Molten Carbonate Fuel Cell (MCFC) for reducing CO2 emission from the flue gas of a hard coal fired boiler. The MCFC is placed in the flue gas stream and separates CO2 from the cathode side to the anode side. As a result, a mixture of CO2 and H2O is obtained;…
The electrochemical behavior of dopamine (DA) at a MWNTs-modified glassy carbon electrode was investigated by cyclic voltammetry (CV), square wave voltammetry (SWV). The MWNTs modified electrode exhibited marked promotion of the electrochemical reaction of DA in different environments. Under optimum conditions, the pe…
Sendust soft magnetic composites coated by a thin Ba-B-P-O system insulating layer were produced; SEM spectroscopy and Energy dispersive X-ray analysis spectroscopy confirmed that thin layers of Ba-B-P-O system covered the alloy powders. The influence of various compaction pressures on composites permeability, DC prop…
Porous TiN ceramics with high porosity and uniform pore structure was prepared following the carbothermal reduction reaction between TiO2 and carbon. Influences of sintering additives and particle size of TiO2 on the microstructure and mechanical properties of porous TiN ceramics were investigated. Microstructure and…
Hysteresis motors are super high speed motors that used in special industries such as high-speed centrifuges, micro gas turbines, and etc. They are basically synchronous motors; however they can works in asynchronous mode. In most reported applications it is controlled in open-loop scheme and there isn't any considera…
Bioactive ceramics/bioresorbable plastic composites have been expected as materials for the fracture fixations which have more biocompatibility than monolithic bioresorbable plastics. In this study, effects of strain rate on the mechanical properties of poly(L-lactic acid) (PLLA) and tricalcium phosphate/Poly(L-lactic…
Heavy metals, including Pb, Cr, Cd, Zn, Cu and Ni, were solidified/stabilized by magnesium potassium phosphate cement (MKPC). The unconfined compressive strength test shows that the strengths of the solidified bodies containing 10%-40% MKPC all exceeded 0.5 MPa, which have met the requirements of storage and landfilli…
An atypical orphan response regulator protein, HP1043 (HP-RR) in Helicobacter pylori, is proven to be essential for cell growth and does not require the well known phosphorelay scheme. HP-RR was identified as a symmetric dimer with two functional domains, an N-terminal regulatory domain (HP-RR(r)) and a C-terminal eff…
In this paper, Eu3+-doped LaAlO3 powders which with the concentration of Eu3+ in the range of 0~5% were prepared by a new liquid mixing method. The structure of the LaAlO3 powders were investigated by X-ray diffraction (XRD), and the influence of the increase of temperature on the crystal structure were also studied.…
Polycrystalline YBaCo4O7 compounds are synthesized by solid state reaction in air atmosphere. X-ray powder diffraction at room temperature indicates its single phase nature. Rietveld refinement of X-ray diffraction data shows distortions in bond lengths in the cobalt-oxygen tetrahedra. Electrical resistivity of YBaCo4…
Electrochemical Synthesis (ES)of polyaniline (PAni) is carried out in the presence in electrolyte (1 M H 2 SO 4 ) of cerium (III) sulfate under potentiostatic and potentiodynamic modes. It is shown that Ce 3+ cations in electrolyte catalyze ES, i.e. accelerate both ES variants. The obtained polymers were characterized…
Hydroxyapatite (Ca10(PO4)6(OH)2is the material used to improve osseointegration of implants in humans. Traditionally Ti-based implant is coated with hydroxyapatite, but this presents several problems such as, low fracture toughness of hydroxyapatite, generation of interfacial cracks during the deposition step and low…
Carbon micro- and nanoscale structures formed during the consolidation of magmatic rocks is investigated. They are very similar to nanoscale carbon structures synthesized in a laboratory. A wide range of elements (Fe, K, Ti, V, Cr, Mn, Ni, Pt, Zn, Ga, Ge, Br, Sr, Zr, and Pb) are identified by XRF analysis in natural g…