Browse

The paper marks evaluation of existing me thodological tools for the formation of polymer composites, summarizes in brief the known technical designs and recent points of view for functioning of the old processi ng methods. Further, to make these systems usable in a practical working environment we will focus on the implementation of well- established utensils and ou tline possible new viewpoints for the modern revelations. Here, we will involve identified developments and routine utilizations, and will propose pr...

The purpose of this paper is to describe a new method of leaching refractory ore with complex leaching solution consists of various chemical substances on the basis of liquid culture heterotrophic bacteria Pseudomonas aureofaciens. The usage of this complex solution was resulted in considerable noble me tals solution increase with a little time of leaching. Experiments were planed with the method of mathematic planning. Quantum- chemical counts have shown stability of metal complexe s have been created in this sol...

Mining and Metallurgy Institute in Bor, Se rbia, has successfully dealt for many years with processing of precious metals. Platinum and palladium have originated from the raw materials of the Bor deposit. By furt her refining in the Institute, the mentioned platinum metals are transformed into high-pu rity metals of which products for various purposes are manufactured. This paper presents the results of comparativ e analysis the high temperature strength of platinum and palladium. The limit of tensile strength as ...

Tungsten carbides coatings are one of the mo st promising coatings used against wear and corrosion in industry, in particular in aerospace, automation, transportation and power generation system. The paper presents the investigation of WC-Co coatings produced by high velocity oxy- fuel (HVOF) spraying method using two feedstock powders with different particles granulation. The substrate selected for depositions was a C45 steel. The morphology and phases modification of the coatings was analyzed by Scanning Electro...

One-step vapor phase oxidation of aliphatic hydrocarbons over nanosized gold catalysts by using oxygen is carried out. Selective oxidation of propylene to propylene oxide, propane to acetone and isobutene to t-butanol with hydrogen- oxygen mixture in flow conditions is investigated. The reaction occurs at the interface perimeter of the support around the gold particles. The activity of these catalysts can be attributed to synergetic effects between gold and titanium. Adsorption of nitrogen oxide over the so synthe...

In this paper we emphasize the main methods of data fusion with potential applications in navigation systems with micro and nano sensors. In the introduction are outlined some basic features of data fusion process. Further the work is st ructured as it follows: 2) Architectures for sensor data fusion, 3) M odels for sensor data fusion; 4) Sensor data fusion methods, 5) Sensor management. At the point 2 of this paper are presented information regarding different types of data fusion architectures, and also the crit...

The paper deals with the description of actual technologies and trends in the development of miniaturized accelerometers used in inertial naviga tion systems. At the technology levels discussions are made ar ound the micro-electro-mechanical systems (MEMS), nano- electro-mechanical systems (NEMS), micro-opto-electro-mechanical systems (MOEMS), and nano-opto-electro- mechanical systems (NOEMS). Miniature accelerometers use two main methods of de tection: 1) moving or bending under the action of an acceleration plat...

Complex uranium ores of Kazakhstan are a potential raw source of gold and RRE, for example, scandium. Experime ntal researches on opening of ores various leaching systems are spent. It is shown, that uran ium accompanying metals can be extracted in solutions.

Titanium is a biocompatible material used in dentistry as una lloyed (minimum purity 99.4%) and alloyed, the most widely used is TiAl6V4 despite some reservations about the releasing of Al and V ions, which can be accumulated in the tissues. To increase the surface contact between the implant and bone, facilitating osseointegration the implants are coated with titanium or ceramic mate rials leading to a ro ughness surface which creates conditions for bone growth, resulting a better anchoring between the implant an...

Tin selenide SnSe was synthesized from tin and selenium powder precursors by high- energy milling in pl anetary ball mill. X-ray diffractio n analysis confirmed that an orthorhombic tin selenide SnSe phase was formed already after 4 min of milling. 119Sn Mössbauer spectroscopy documented the values of SnSe isomer shifts corresponded to Sn in the oxidation state II. The size and morphology of tin selenide particles were studied by specific surface area measuremen ts, and transmission electron microscopy. Specific ...

The main aim of the work is theoretical and experimental research of nanocomposite systems formation process on the model of chromium electrolytic coatings, ascertainment of laws and mechanis ms of silicon dioxide nano-sized particles influence on the structure and properties of metal. We researched the process of electrolytic formation of chrome - silicon dioxide nanocomposite systems and nanostructured composite electrolytic coatings with silicon dioxide (3-50 nm) used as a dispersed phase. Methods of the resear...