Materials Literature
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The optical properties of vanadyl phthalocyanine (VOPc) thin films have been studied in the spectral range 300-900 nm. Variations in the optical constants with wavelength are found to be thickness dependent of the films. The optical band gap E g and optical conductivity ? opt were determined. The analysis of the optic…
Potassium titanate, K2TiO3, with a chain structure of TiO5 polyhedra was exfoliated in an aqueous nitric acid solution of pH ≤ 1 and Tyndall scattering due to the colloid formed by the exfoliation was observed. The colloidal particle size measured by dynamic light scattering was approximately 300 nm. The stripe patter…
Silicon-centered polyoxomolybdate K4[SiMo12O40] (KSM) with the Keggin type structure was investigated as the cathode material for rechargeable lithium battery. The discharge capacity and cycle performance of KSM mainly depends on the annealing temperature. This material shows improved discharge capacity by the increas…
To better understand experimentally observed surface‐enhanced Raman Scattering (SERS) of polychlorinated biphenyls (PCBs) adsorbed on nanoscaled silver substrates, a systematic theoretical study was performed by carrying out density functional theory and time‐dependent density functional theory calculations. 2,2′,5,5′…
The stability of gaseous GeMo 2 O 7 and GeB 2 O 4 were confirmed by Knudsen effusion mass spectrometry. To get structure parameters of these gaseous salts quantum chemical investigation of molecules was undertaken.
The experimental investigation of diffusion bonding of magnesium alloy (AZ31B) to Cu in vacuum was carried out by using Sn foil as transition metal. The microstructure of the welded joints was studied by SEM, EDS, XRD and the mechanical properties of the samples were tested by tensile experiments. The results show tha…
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Age-hardenable Al–Mg–Si alloys containing additional elements of Ag, Cu, Pt or Pd were processed by high-pressure torsion (HPT) and they were subsequently aged at a temperature of 373 K for up to a total period of 5,400 ks. It was found that, in all alloys, the grain sizes after HPT were refined to 300–430 nm and ther…
The electromagnetic pulse technology (EMPT) provides non-contact processes for joining, welding, forming and cutting of metals. For EMPT processing electromagnetic coils are used, to which a short but very high-power electric current is applied from a pulse generator. The coil produces electromagnetic forces, which ca…
Photo-electrochemical etching with step- gradient illumination intensity was used to generate multi – porosity silicon quantum wire system (Q.W.Si) on n-type silicon wafer. A nano size photonic device of AL/Q.W.Si /si/AL was fabricated to investigate the electrical properties and the surface morphology with the aid of…
Glassfiber core material used as the insulation filler of vacuum insulation panel was successfully fabricated by wet method. The quality of glassfiber suspensions dispersion could affect glassfiber distribution of the core material and the thermal insulation performance of glassfiber vacuum insulation panels. The effe…
Chitin is the most abundant natural amino polysaccharide and is next to cellulose in abundance on the planet. Chitosan is obtained by deacetylation of chitin. Chitosan is being researched by academic and industrial scientists as an underutilized resource and as a new functional material of high potential in various fi…
Терагерцовая фотопроводимость Рё нетривиальные локальные электронные состояния РІ легированных полупроводниках РЅР° РѕСЃРЅРѕРІРµ теллурида свинца, Р СЏР±РѕРІР° Р›.Р
Melt fragmentation, quenching and long term coolability in a deep pool of water under reactor vessel are employed as a severe accident mitigation strategy in several designs of light water reactors. Success of the strategy is contingent upon effectiveness of natural circulation in removing the decay heat generated by…
In this experiment, red sandstone specimens, having slenderness ratios of 0.5, 0.7, 0.9 and 1.1 respectively, were subjected to blow tests using a Split Hopkinson Pressure Bar(SHPB) system at a pressure of 0.4 atmospheres. In this paper, we have analyzed the effect of slenderness ratio on the mechanical properties and…
In the present paper, the kinematic equation of a monolayer graphene is proposed based on a plate theory, and the nonlinear elasticity stress-strain relations are obtained from experiments. The equation includes cubic and quintic nonlinearities. The bending produced when subjected to a concentrated force at the center…
The three-dimensional mathematical model for a three-phase flow during its horizontai solidification is studied using fluid dynamics method based on Eulerian-Eulerian and volume of fraction methods, in which the mass, momentum, species, and enthalpy conservation equations of the Fe-Pb alloy solidification process are…
We use Monte Carlo simulations to study polymer melts consisting of fully flexible and moderately stiff chains in the bond fluctuation model at a volume fraction 0.5. In order to reduce the local density fluctuations, we test a pre-packing process for the preparation of the initial configurations of the polymer melts,…
We report on the influence of low gamma irradiation (10(4) Gy) on the noise properties of individual carbon nanotube (CNT) field-effect transistors (FETs) with different gate configurations and two different dielectric layers, SiO2 and Al2O3. Before treatment, strong generation-recombination (GR) noise components are…
The results from direct and indirect determinations of the magnetocaloric parameters of Mn0.99Co0.01As have been analyzed. The isothermal entropy change (ΔST) due to external magnetic field changes has been determined through direct measurements of the heat absorbed by the sample when the field is removed under isothe…