Materials Literature
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In this paper, we present our investigations of silicon solar cells and module structures by means of terahertz (THz) imaging and Fourier Transform Infrared (FTIR) spectroscopy. Several types of structures were investigated: anisotropically etched surfaces of monocrystalline silicon wafers, complete commercial solar c…
Natural extracellular matrices (ECMs) perform the tasks necessary for tissue formation, maintenance, regulation and function, providing a powerful means of controlling the biological performance of regenerative materials. The extracellular matrix represents Mother Nature's biologic scaffold. The ECM is rich in structu…
Composites are the engineered materials made from two or more constituent materials, with significantly different physical and chemical properties and which remain distinct and separated at the microscopic level within the finished structure. These are becoming more and more important because of its increased utility.…
Irradiation of condensed media appreciably changes the equilibrium thermodynamic properties of liquid systems; in particular, the thermodynamic equilibrium becomes violated, and the liquid restructuring takes place. The corresponding variations in the physical properties of liquid systems and their consequences have b…
Electrospinning is a technique that allows the preparation of nanofibers from various materials. Chitosan is a natural and abundant easily obtained polymer, which, in addition to those features, proved to be biocompatible. This work used nanostructured chitosan and polyoxyethylene membranes as subcutaneous implants in…
Collagen is a kind of natural biomedical material and collagen based three-dimensional porous scaffolds have been widely used in skin tissue engineering. However, these scaffolds do not meet the requirements for artificial skin substitutes in terms of their poor mechanical properties, short supply, and rejection in th…
Relaxation processes in side-chain liquid-crystal azomethine polymer have been studied using dielectric spectroscopy in wide ranges of temperatures and frequencies. Two low-temperature relaxation processes (β 1 and β 2 ) caused by low-amplitude noncooperative motion of kinetic units in side groups and a high-temperatu…
The corrosion inhibition efficiency of benzimidazole, 2-methylbenzimidazole and 2- aminobenzimidazole for mild steel immersed in 3.5 NaCl solution was investigated by electrochemical impedance spectroscopy EIS at concentration range from 10-5 to 10-2 M of imidazoles and temperature range from 30 to 50°C. In addition,…
Metal hydride (MH) actuators have a simple structure and a number of features that make them attractive for use in rehabilitation engineering and assistive technology. The MH actuator provides a high power-to-weight ratio, high-strain actuation, human-compatible softness, and noiseless operation, while being environme…
The research was conducted in February-March 2015 with a goal to determine the relationship between the oil content and the abundance of diatomsin Meral Karimun waters of Riau Islands Province. The survey method was applied in four stations with three sampling strata,i.e. the surface area, the middle and near the bott…
The majority of high voltage cables are sized and operated by a continuous current rating which is based on the worst-case assumptions. However, the load on the cables themselves may vary significantly depending upon the time and season. In this paper, a dynamic thermal model for a cable in air installation is built u…
The paper contains an experimental study of micro-cutting intended to help the optimization of the grinding process of the silicon nitride ceramic Silinit R (Si3N4 - Al2O3 - AIN - TiN). The investigations were carried out to determine the normal and tangential cutting forces, the critical penetration depth and the spe…
World demand on menthol is so high and it is also a chalenge for organic synthetic chemist to develop new method of synthesis and conversion from another sources. Tandem cyclization-hydrogenation reaction towards citronellal is one important mechanism recently. Within the mechanism, hydrogenation of isopulegol is rate…
In the present work, vanadium pentoxide (V2O5) nanoparticles have been investigated for monitoring ethanol (C2H5OH) at ppm levels in air. A one-step flame spray pyrolysis (FSP) process has been applied for the synthesis of vanadium pentoxide (V2O5) and platinum-loaded vanadium pentoxide (Pt-V2O5) nanoparticles. The sa…
The aim of this work is to analyze the error of the calculated integrated intensity of the x-ray peaks of a-iron (BCC-Fe) powder from x-ray diffraction (XRD) pattern by using the numerical method and the statistical analysis. The a-Fe powder was characterized by the x-ray diffractometer using step scan mode, step size…
A cohesive zone damage-healing model (CZDHM) derived based on the laws of thermodynamics for self-healing materials is presented. The well-known nominal, healing, and effective configurations of classical continuum damage mechanics are extended to self-healing materials. A new physically-based internal crack healing s…
An effect of external magnetic field on surface plasmon resonance (SPR) phenomenon has been studied using cobalt ferrite nanoparticles on silver-Kretschmann configuration. The cobalt ferrite (CoFe2O4) nanoparticles with the size of about 4 nanometers were synthesized by a coprecipitation method. The SPR system was app…
In the recent years there has been a considerable increase in demand for the electrical power requirement in our country. Presently the transmission system voltages has increased to 765 kV ac and 800 kV dc, keeping in view of the future demand experimentation and simulation studies for 1200 kV ac and 1100 kV dc transm…
Partial Discharge (PD) measurement is well known as powerful method to identify the condition of high-voltage insulation. This paper investigates the properties of the ultra-high frequency (UHF) electromagnetic (EM) wave emanating from the air discharge (corona) under high voltage DC source. By applying both positive…
The main barrier of a dry type transformer is the major insulation between the high voltage and low voltage windings, usually consisting of air and solid in combination, aiming to meet the dielectric requirement. The lightning impulse test is the major driver to the insulation design. The design rule is usually set by…