Star Formation with ALMA

Stars are believed to form from interstellar material through the gravitational collapse of dusty clouds. Interstellar medium is a very dynamical environment in which clouds of atomic gas (and its associated dust counterpart) form in warm medium fragments, perhaps as a result of turbulence or the passage of shock, and subsequently cool down and condense. Although the dust is a tiny fraction (of order 1%) of the total material mass, it plays a major role in the cloud evolution because its opacity can shield the cloud center from the interstellar UV field and dust surfaces act as a catalyst on which molecular hydrogen can form. For high enough column density, the combined effect of dust shielding and self-shielding of H 22 turn the initially predominantly atomic gas into molecular form. H 22 forms first, but more and more complex species such as CO, CN, and HCN, form during cloud evolution

EFFECTIVENESS RISE OF REFRIGERATING PLANTS OF RAILWAY TRANSPORT BY OPTIMIZATION OF THEIR OPERATION MODE

There the procedure of statical and dynamical optimization of refrigerating system on the basis of thermo-economic approach has been developed. The influence of different factors (the temperature of heat sources, the effectiveness of separate members etc.) on the value of optimizing variables has been brought out. The law of optimum control over the refrigerating plant under the different climatic conditions has been obtainedAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio