A. A. Titov

Web-system for processing and visualization of meteorological data for Siberian environment research

Abstract At present, mainly GIS software is used for exploration and visualization of spatially distributed data. At the same time an approach based on the combination of advanced web technologies along with the standard rules of information-computational system development is more suitable for performing tasks requiring more sophisticated data analysis. In this report, functional capabilities of the information-computational system created for meteorological and climatic data processing and online visualization are introduced. The system represents a dedicated web-interface, which allows performing of mathematical and statistical operations on the diverse observational and model data and to determine characteristics of global and regional climate changes. Currently such datasets as NCEP/NCAR Reanalysis, ECMWF ERA-40 Reanalysis, etc. are available for processing. In particular, the system allows calculating of temporal average and extremum values, time trends, etc. at arbitrary spatial and temporal ranges for different meteorological parameters. The possibility of online intercomparison of meteorological characteristics calculated for different datasets is also realized in the system. The final version of the system being developed is supposed to find application in meteorological and climatological investigations and should help researchers to save time during performing routine analytical tasks by simplifying handling of huge arrays of spatially distributed meteorological data.

Thermodynamic Modeling of BCxNy Chemical Vapor Deposition in the B–C–N–H System

Thermodynamic analysis of the chemical vapor deposition of BN-based films in the B–C–N–H system was carried out for reduced pressures (133 and 1.33 Pa) and a wide temperature range (300–1300 K). The results indicate that, using mixtures of trimethylamineborane, (CH3)3N · BH3u2009, with H2u2009, NH3u2009, or N2u2009, one can produce films of various compositions: from BN to mixtures of BN, carbon, and boron carbide.

Experimental Investigation of Skin Friction Drag and Heat Transfer on the Surfaces With Concavities in Compressible Fluid Flow

This experimental study has been performed to investigate the surface heat transfer enhancement in compressible fluid flow by using hemispherical concavities (dimples). The experiments were carrying out in supersonic wind-tunnel with free-stream Mach number 2,8. Using the IR-imager the temperature fields of the testing plates were obtained at any time of experiments. The studying of these fields at unsteady conditions allowed to obtain the area-averaged heat transfer coefficient. The skin friction drag of the test plates was found by direct weight measurement with using a “smoothing element”. The skin friction drag and heat transfer were measured simultaneously (at the same conditions) in each experiment. The plate with dimples with ratio of dimple depth to dimple print diameter 0,14 was investigated. It was shown that the tested surface with concavities (vortex generation relief) intensified the heat transfer and decreased the recovery factor in supersonic flow. The ratio of the heat transfer enhancement to the skin friction drag increasing for the dimpled surface in compressible flow is equal to 0,7.Copyright

Development of Distributed Research Center for analysis of regional climatic and environmental changes

We present an approach and first results of a collaborative project being carried out by a joint team of researchers from the Institute of Monitoring of Climatic and Ecological Systems, Russia and Earth Systems Research Center UNH, USA. Its main objective is development of a hardware and software platform prototype of a Distributed Research Center (DRC) for monitoring and projecting of regional climatic and environmental changes in the Northern extratropical areas. The DRC should provide the specialists working in climate related sciences and decision-makers with accurate and detailed climatic characteristics for the selected area and reliable and affordable tools for their in-depth statistical analysis and studies of the effects of climate change. Within the framework of the project, new approaches to cloud processing and analysis of large geospatial datasets (big geospatial data) inherent to climate change studies are developed and deployed on technical platforms of both institutions. We discuss here the state of the art in this domain, describe web based information-computational systems developed by the partners, justify the methods chosen to reach the project goal, and briefly list the results obtained so far.

Effect of Fine-Particle NbC Additions on the Structure and Superconducting Properties of (Bi,Pb)2Sr2Ca2Cu3O10 + xCeramics

Abstract(Bi,Pb)-2223 superconducting ceramics prepared by heat treatment at 840°C and containing 0.1 to 0.5 wt % fine-particle NbC additions were characterized by microstructural analysis, x-ray diffraction, and magnetic susceptibility measurements. The introduction of 0.1 wt % NbC was found to raise the 77-K zero-field critical current density by a factor of 2 to 3, reduce the superconducting transition width, and slightly increase Tcu2009.

Joint processing of experimental data on melting, evaporation, and sublimation processes

A technique and computational program for estimating thermodynamic parameters are developed for the joint processing of experimental data on the saturated vapor pressure in melting, evaporation, and sublimation processes. Computation is based on the equality of pressures over the solid and liquid phases at a melting temperature. The efficiency of the proposed technique is demonstrated by processing experimental data on the phase transitions of Sc(thd)3.

Thermodynamic modeling of BCN chemical vapor deposition from N-trimethylborazine + ammonia mixtures

Low-pressure (13.3 and 1.33 Pa) chemical vapor deposition in the B-C-N-H and B-C-N-H-O systems from N-trimethylborazine + ammonia mixtures has been analyzed in a wide range of deposition temperatures, 300–1300 K, using thermodynamic modeling. The results indicate that the presence of oxygen adds significant complexity to the composition of condensed phases. We have examined the feasibility of producing films of various compositions and determined deposition conditions. Oxygen-free deposits can be obtained at high temperatures. At temperatures of 600 and 700 K, the limiting composition of the condensed phase, B: N: C = 1: 1: 1, can be reached at a total pressure in the system of 1.33 and 13.3 Pa, respectively.

Synthesis of hexahydro[1,4]diazocino[7,8,1-jk]carbazoles and 1-methoxy-9-(β-vinylethylamino)ethylcarbazoles

3-Ethylhexahydropyrazino[3,2,1-jk]carbazole is converted into hexahydro[1,4]diazocino[7,8,1-jk]carbazoles by the action of methyl propiolate and acetylacetylene in acetonitrile and into 1-methoxy9-(β-vinylethylamino)ethylcarbazoles by the action of acetylenedicarboxylic ester and methyl propiolate in methanol. 3-Benzyl-substituted pyrazinocarbazole does not react with alkynes.

Thermodynamic analysis of preparation processes for boron-containing films with the use of N-trimethylborazine and hydrogen

The possibilities for using a minimization program for Gibbs energy functions (Gmin) in multiphase multicomponent systems are illustrated. The process of chemical vapor deposition in a B-C-N-H-O system at reduced pressure (13.3 Pa) over a wide range of synthesis temperatures (300–1300 K) with the use of an initial gas mixture of N-trimethylborazine and hydrogen is modeled thermodynamically. The possibility of obtaining films of different compositions is shown, and the boundary conditions for the deposition of coatings of the general composition BCxNy are determined.

Effect of HfN microadditions on the microstructure and superconducting properties of (Bi, Pb)2Sr2Ca2Cu3O10+x ceramics

The effect of ultrafine hafnium nitride additions (0.05–0.2 wt %) on the microstructure, phase composition, density, and superconducting properties (Tc and jc) of (Bi,Pb)2Sr2Ca2Cu3O10 + x ceramics is studied. The elemental composition of individual phases is determined, and the magnetic-field distribution in the ceramics is examined. The introduction of hafnium nitride increases the density of the ceramics and improves their microstructural stability at sintering temperatures between 840 and 850°С. The low hafnium solubility in the superconductor offers the possibility of attaining higher magnetizations and 77-K critical current densities.