Molecular Clouds and Star Formation Rate in Disk Galaxies

We use N -body/hydrodynamic simulations of a Milky Way-like galaxy to study the physical properties of giant molecular clouds and star formation rate on different spatial scales. We confirm the previous estimates that the dark gas fraction in molecular clouds reaches about 30% by mass. We find that conversion factors for individual molecular clouds deviated by a factor of several times from the mean value for the Milky Way clouds, X CO = 2 × 10 20 cm −2 (K km s −1 ) −1 , and hence a constant X CO conversion factor cannot represent the physical properties of an individual molecular cloud or a small sample of clouds sufficiently well, but the conversion factor averaged over the whole ensemble of clouds is believed to be close to the MilkyWay value. The∑ SFR UV − ∑ gas$\Sigma _{{\rm{SFR}}}^{{\rm{UV}}} - \Sigma _{{\rm{gas}}}$ relation can be reproduced using UV calibration for smoothing scale compared to the size of individual star-forming complexes, ~ 0.3 − 1 kpc.

Hydrolysis of chitin and chitosan in low temperature electron-beam plasma

Hydrolysis of natural chitin and chitosans was performed in the electron beam plasma (EBP) of oxygen, by means of specially designed electron beam plasmachemical reactor (EBPR). Low molecular water-soluble chitin oligosaccharides with weight-average molecular mass 800–2000 Da and polydispersion index 1.5–2.5 were produced due to action of active oxygen species formed in the EBP. By optimizing the treatment conditions the 95% yield of chitin oligosaccharides was obtained after 2 min whereas the conventional chemical hydrolysis usually takes several days. The studies of the antimicrobial activity of low molecular products formed due to EBP-stimulated degradation showed that they inhibit the multiplication of various mycelial and yeast-like fungi. The technique involved is likely to be promising for the production of bioactive low molecular chitin oligosaccharides and the EBP-stimulated hydrolysis appears to be competitive with technologies conventionally used in the industry.

Recovery of Ra-223 from natural thorium irradiated by protons

Irradiation of natural thorium with medium-energy protons is considered to be a prospective approach to large-scale production of 225 Ac and 223 Ra. In addition to the earlier-developed method of 225 Ac isolation, the present work focuses on the simultaneous recovery of. 223 Ra from the same thorium target. Radiochemical procedure is based on liquid-liquid extraction, cation exchange and extraction chromatography. The procedure provides separation of radium from spallation and fission products generated in the thorium target. High chemical yield (85– 90%) and radionuclide purity of 223 Ra (> 99.8% except 224 Raand 225 Ra isotopes) have been achieved.

Signal Processing and Modeling of Fractional Order Dynamical Systems Based on Approximated Type Operational Calculus.

Smart Technologies For Evaluation Of Structure State (ae Technologies And New Generation Control Equipment On Its Basis)

On Some Limitations of Information Flow Tracking in Full-system Emulators

Research and Development of Design Shape of a Mobile Robotic System For Geological Exploration on the Moon's Surface

The Extracorporeal Bio-Xeno Perfusion (myelo-timo-spleen) in Multi-organ Supportive Therapy (MOST) as a Modulator of Energy, for Immuno Correction Compensatory Anti-Inflammatory Response Syndromes, and Persistent Inflammation, Immuno suppression, Catabolism and Multi-organ Dysfunction

At the Crossroads of Traditions (Kuzebay Gerd and Russian Poetry)

THE STUDY OF THE OLDER ADULTS’ HUMAN CAPITAL: SETTING THE PROBLEM