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Submit scientific paper, scientific publications, International Research Journal | Meždunarodnyj naučno-issledovatel’skij žurnal

ISSN 2227-6017 (ONLINE), ISSN 2303-9868 (PRINT), DOI: 10.18454/IRJ.2227-6017
ПИ № ФС 77 - 51217

OBTAINING INDIVIDUAL 3D IMPLANTS FOR BONE PLASTICS ON THE BASIS OF MATERIALS FROM CALCIUM MAGNESIUM PHOSPHATE

Posted in 2017, CHEMISTRY, Issue № 4(58) April 2017 | 0 comments

Dicalcium phosphate dihydrate, bioresorbable calcium phosphate, is of great interest to researchers due to the development of a regenerative approach in the treatment of bone tissue. Magnesium-containing cements have a very positive effect on cellular activity and the improvement of strength characteristics in the pre-pressing of the cement paste. The aim of this paper is to obtain a magnesium-containing reaction bonded material based on brushite and newberyite. The regularities of the influence of magnesium amount in the precursor and the pressing pressure on the strength characteristics of the final product are established. The method for obtaining individual implants made with the help of 3D modeling for bone tissue restoration is proposed.

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PHYSICAL AND CHEMICAL JUSTIFICATION FOR FLAME ARRESTERS SELECTION

Posted in 2017, CHEMISTRY, Issue № 4(58) April 2017 | 0 comments

The article considers the basic physical and chemical principles of flame arresters selection; based on the flame chilling theory, it provides some calculations and guidelines on flame arresters efficiency improvement. The article also describes the parameters of chemical formulation of fuel combination for determination of flame arresters technical data. The article shows the importance of blast overpressure calculations and a maximum normal flame speed of combustible mixtures for the determination of flame arresters reliability.

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MAIN FEATURES OF QUANTUM PROPERTIES OF OXIDE MELTS

Posted in 2017, CHEMISTRY, Issue № 4(58) April 2017 | 0 comments

The quantum properties of boron oxide melts are considered in the paper. The research has shown that substances with zero entropy have quantum properties, such as superfluidity, two-fluid structure, quantum funnels forming. In this paper, we consider the main features of the quantum properties of oxide melts. The discovery of a new class of superfluid materials allows to perform fundamental research in the field of superconductivity and anomalous thermal conductivity.

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A NOVEL TECHNOLOGY FOR PRODUCING OF [18F]FLUMAZENIL, RADIOPHARMACEUTICAL FOR BRAIN RECEPTORS STUDIES BY PET

Posted in 2017, CHEMISTRY, Issue № 4(58) April 2017 | 0 comments

For the first time an express method of solid phase extraction (SPE) was proposed for producing of [18F]flumazenil ([18F]FMZ), a radioligand for visualization GABAA receptors by positron emission tomography (PET). Efficiencies of [18F]FMZ extraction by SPE on commercially available cartridges and by traditional semi-preparative HPLC were compared. Application of novel radiochemical automated technology allowed to obtain 2-5 clinical doses of radioligand in one production run (53 minutes). [18F]FMZ was produced with specific activity >185 GBq/µM, radiochemical purity >98 % and ≤ 4 µg/ml of nitromazenil residual amounts. The obtained preparation meets all Pharmacopoeia requirements and can be recommended for PET clinical applications.

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APPROACHES TO TECHNOLOGICAL SIMULATION OF FLOTATORS FOR WATER TREATMENT

Posted in 2017, CHEMISTRY, Issue № 3(57) March 2017 | 0 comments

Flotation treatment processes of natural and waste water are universal as for the extraction of pollutants causing the vast area of their application. At that the development of flotators is performed based on the analogous-empirical basis, and that makes it difficult to implement the flotation process with maximum efficiency. The main goal of this work is to determine the approaches to the technical modeling of flotation cells and flotation process in them. Consideration of hydrodynamic factors in relation to the physical-chemical interactions in the flotation cell is a new basis for the modeling of the flotation water treatment process, the further improvement of devices and improvement of the efficiency of the contaminant flotation process. The main of them are: the hydrodynamics of the flotation cell, the formation of flotocomplexes, the movement of flotocomplexes, the processes in the foam layer. Solution of the problem of technological simulation of flotators allows to design the construction of flotation cells, providing a favorable hydrodynamic conditions for movement of flotocomplexes, as well as to select the optimal conditions for conducting water cleaning flotation process during operation.

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CHEMICAL REACTION AS REALIZATION OF CHEMICAL MOTION FORM: HISTORICAL CONTEXT PROBLEMS

Posted in 2017, CHEMISTRY, Issue № 2(56) February 2017 | 0 comments

During the time the representation of chemical reaction as realization of chemical form of motion of matter was seriously suffered by the transformation of representations of atoms and molecules. Refusing the pure speculation and turning to the experimental observations, the scientists have received a conclusion, that a chemical form of motion properly is an electronic interaction of atoms and molecules. This interpretation makes it possible to explain the mechanism of a chemical reaction, to demonstrate the kinetics of chemical process and self-organization of macromolecules, to plan the complex organic synthesis, to carry out the quantum-chemical calculations. So, modern chemistry in the practical part purchased from hi-tech character.

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