Komarovita

Los anlálisis dieron Si02 23,50, TiO2 2,50, Nb2 05 47,00, A1208 1,00, Fe208 1,50, MnO 5,00, CaO 4.70, Na2O 0,85, K2O 0,30, H2O 12,00, F 1,21, total 99,56 - (O = F2) 0,51 = 99,05 %.(...

Geoinformation space monitoring in the task of sustainable development of the regions located along the main ground routes

The article proposes a concept for assessing the natural resource potential and the ecological state of the territories located along the main land routes in order to ensure the sustainable development of the territories. The relevance of building a geoinformation monitoring system for a comprehensive ecological and economic assessment of the regions located along the main land routes is considered. The existing scientific publications on the assessment of the ecological state of the territories are analyzed, including the mathematical apparatus for the assessing. The author’s methodology for the implementation of geoinformation modeling and analysis of remote sensing data using the methods of validation of space information is presented. The set-theoretic models of geoinformation mapping of the natural resource potential of the regions located along the main land routes are presented. The conclusion is made about the advantages of using the methods of geoinformation space monitoring for continuous observation and assessment of the state of the territories located along the main land routes

Surface modification of orthodontic implants by nanocomposite coatings based on chitosan and metals

Purpose: to study the properties of nanostructured coatings in orthodontic implants. Material and methods. Low and average molecular mass chitosan, 3-amynopropil-3-methoxysylan and suspensions of 5 nm and 10 nm gold nano-spheres stabilized with natrium citrate were used for nanocomposed surfaces. 2mg/ml polyethylenamin water solution was used for making the underlayer before putting polyion coverage using «POLYION-1M». The polyion covering dynamics was studied by polyquartz weighing method. Morphology of created layers was studied with atomic microscopy, elements were studied by secondary ion mass-spectrometry. Results. The best transmission among structures of chito-san/metals was showed by low molecular mass of chitosan and 8-1 Onm nanoparticles of metals. Analysis of roughness of surface shows that nanoparticles of gold make the most solid surface on 3-amynopropil-3-methoxysylan underlayer. Conclusion. The development of biocomparative materials in maxillofacial surgery is considered to be effective method of decreasing the risk of post-operative inflammatory complications by local antibacterial effect

Measurement of the 242gAm (T1/2=16.02 hour) fission cross section

There was performed a cycle of 242gAm fission characteristics measurements with the use of IRT-MEPhI reactor. The 242gAm isotope was produced in the course of irradiating 241Am targets in the experimental channel with the density of neutron flux ≈ 2 ×10131/(cm2.s). Then, with no isolation of americium-242 from the irradiated targets the time dependencies of induced fission fragments yield from the targets were measured. Moreover the irradiated americium targets undertook irradiation in another channel of IRT reactor with the density of thermal neutron flux ≈ 5.6 × 1010 1/(cm2.s). The fission fragments were registered with the aid of dielectric track detectors. In each time dependence of fission fragments an exponent with T1/2=16.02 hour is available; the cross section of 242gAm fission by thermal and resonance neutrons was determined by the intensity of induced fissions with the given half-life. The quantity of 242gAm nuclei in each of irradiated targets was determined basing on accumulation of 242Cm, daughter product of 242gAm decay. Based on the experimental results for the 242gAm nuclide, the evaluations of both the fission cross section by thermal neutrons and the fission resonance integral were obtained