Materials Literature
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Abstract Nitrogen‐doped carbon materials were prepared by ammoxidation of commercial carbon sources (carbon black and activated carbon) and applied as base catalysts for Knoevenagel and transesterification reactions. It was shown that these carbon materials were active and the activities were different depending on th…
The overall reliability of a power transformer depends to a great extent on the sound operation of the bushings thereof. Oil impregnated paper (OIP) insulated bushings have been in use for a long time now. In many situations, it becomes necessary to avoid OIP insulation in bushings. In the recent past, a new technolog…
Near Infrared (NIR) luminescence is useful for many applications ranging from lasers, telecommunication to biological imaging. We have a special interest for applications in biological media since NIR photons have less interference with such samples. NIR photons can penetrate relatively deeply in tissues and cause les…
Biosynthesis of gold nanoparticles has emerged as an important area in nanotechnology and biotechnology due to growing need to develop environmentally benign technologies. Generally, nanoparticles are prepared by a variety of chemical methods which are not environmentally friendly. In the present study, we report a ra…
Quantum paraelectric SrTiO3 has resulted in many investigations because of the anomalous properties. Here, using the conventional solid-state reaction method, we fabricated polycrystalline SrTiO3 ceramics with pure cubic perovskite structure. A dielectric loss peak is observed at around 450 K and 100 Hz and it shifts…
Nanoparticles of ZnO and their application in coating systems have attracted a great deal of attention in recent years because of its multifunction property, especially antibacterial activity. In this study, antibacterial and physical properties of poly(vinyl chloride) (PVC) based film coated with ZnO nanoparticles we…
Naturally concrete shrinks when it is subjected to a drying environment. If this shrinkage is restrained, tensile stresses develop and concrete may crack. Plastic shrinkage cracks are especially harmful on slabs. One of the methods to reduce the adverse effects of shrinkage cracking of concrete is by reinforcing concr…
Syndiotactic polystyrene (sPS) samples were quenched at low temperature (0°C) in the presence of Multi-Walled Carbon Nanotubes (MWCNT) at different concentrations. The influence of carbon nanotubes on the structure and physical properties of sPS composites was investigated by SEM, X-ray diffractograms, DSC (Differenti…
Empirical long-term strength criterion in terms of limit stress for constructive polymer materials considering ageing factor is found. The criterion corresponds to the type of Goldenblat - Kopnov. On the grounds of the given experimental research of the ageing processes of the polymeric composites, empirical constants…
The article contains the description of the basic forms of the economic relations in the social and cultural field (SCF) which were formed in the Soviet and post- Soviet period and are being developed in the modern economy of Russia. The knowledge of methodology of the shaping and development of the economic relations…
Analysis of expert systems application in labour safety at the engineering enterprises which is used in decision-making support systems by the head of a department is considered. The efficiency of these systems is proved. Procedural chains of decision-making with flexible management strategies are presented.
A general approach to the mathematical modelling of the grain fractional cleaning process in the grain cleaning aggregate with different function charts is given. Its rational characteristics and functional values are synthesized.
The surface modification of the anatase titania nanoparticles prepared via a controlled nonhydrolytic sol-gel process is achieved by the formation of the bidentate coordination between titania and methacrylic acid (MAA) molecules. The in situ photocatalytic polymerization of methyl methacrylate (MMA) monomer is initia…
A brief review of vibration mechano-chemical covering and samples of practical application of the solid oil on the basis of molybdenum disulfide, made up under conditions of vibration treatment are given. A model structure of forming molybdenum disulfide covering is displayed.
The method of efficiency and quality increase of dry milling in impact mill by creating the magnetovibrating layer in rotating beater area is considered. It is shown that the milling degree and average particle size of produced powder depend not only of milling time, but also of magnetic field regimes.
Improvement of working conditions under the influence of harmful substances on the machine-building enterprises workers is an actual problem. Reliable data on the technological process for correct calculation of ventilation on the test sites of agricultural machines are required. Existing techniques are focused on the…
The approach to external signs of failures formalizing is offered. The example of its practical usage for the main hydrosystem of harvester “Don-1500B” is considered. The diagnostic checks set defining method is described.
Improvement of transport network design efficiency problems at the expense of the system approach to the estimation of network quality and assigned communications services quality are considered. Methods and technical facilities that provide constancy and control complexness of network quality on different stages of i…
The existing software packages in the cluster systems are analyzed. The characteristics of clusters and cluster distributives are given, topological variants are considered, distinctive characteristics of the main software packages are determined.
Influence of acoustic parameters (amplitude of ultrasonic oscillations A (mcm), frequency of ultrasonic oscillations (Khz), and a corner between the axis of the wave guide and the vector direction of longitudinal-twisting oscillations (degrees)) process of an electroacoustic dusting of the protective coatings on quali…