The role of microorganisms in the weathering of rocks. 1 - Microflora of the surface layer of rocks

Microbiological analyses of surface layers of rocks to determine role of microorganisms in weathering of rock

The role of microorganisms in the weathering of rocks. 2 - Focal distribution of microorganisms on the surface of rocks

Microorganism growth in synthetic medium using rock as mineral nutrient source, and rock weathering due to microorganism

Order of Selection and Design of Magnetic Clutches for Sealed Machines

A technique for selection and design of magnetic clutches with highly coercive permanent magnets (barium oxide magnets or magnets produced from such alloys of rare-earth elements as samarium-cobalt and neodymium-iron-boron) for sealed machines (pumps, compressors, mixers) is presented. © 2013 Springer Science+Business Media New York

EAS spectrum in the primary energy region above 10 to the 15th power eV by the Akeno and Yakutsk array data

The extensive air showers spectrum on scintillation desity Rko in primary energy region E sub approx. 10 to the 15th power - 10 to the 20th power eV on the Yakutsk array data and recent results of the Akeno is given

All particle energy spectrum of cosmic rays in 10 to the 15th power - 10 to the 20th power eV region

Average estimations of the shower energy components are presented and their sum gives E sub 0 (Rho sub 600) - an average function of the relation of E sub 0 with the shower size parameter Rho sub 600 measured at the Yakutsk extensive air showers (EAS) array. Using this relation to the EAS spectrum obtained at the Akeno and Yakutsk arrays the energy spectrum of the cosmic ray total flux within 15 lg (E sub 0,eV) 20 by the EAS methods is recovered

Microstructure and phase composition of cold Isostatically pressed and pressureless sintered silicon nitride

The microstructure and physical properties of new Y₂O₃ and Al₂O₃ oxide-doped silicon nitride ceramics fabricated by cold isostatic pressing and free sintering were investigated. The phase composition of produced material was also studied by X-ray diffraction at room and elevated temperature. The fabricated ceramics featured a microstructure of Si₅AlON₇ grains with a fine-grained α-Si₃N₄ with a small amount of Y₂SiAlON₅. Described ceramics is attractive for many high-temperature structural applications due to beneficial combination of fine-grained structure with improved mechanical properties and small weight los

Analysis of Maximum Angle of Mismatch between Half Couplings of a Magnetic Clutch and Highly Coersive Permanent Magnets

A procedure is proposed for analysis of maximum mismatch angle between the half couplings of a magnetic clutch and highly coersive permanent magnets (formed from alloys of rare-earth elements - samarium-cobalt and neodium-iron-boron) during the start-up of an asynchronous motor is proposed for the design of hermetically sealed machines (pumps, compressors, mixers, etc.). © 2013 Springer Science+Business Media New York