We present a method to derive positions of molecular clouds along the lines of sight from a quantitative comparison between 2.6mm CO emission lines and 18 cm OH absorption lines, and apply it to the central kiloparsecs of the Milky Way. With some simple but justifiable assumptions, we derive a face-on distribution of the CO brightness and corresponding radial velocity in the Galactic centre wit...

A simple and efficient numerical model describing the processes of nucleation, growth and transport of multi-component nanoparticles is developed. The approach is conceptually similar to the classical method of moments but can be applied to co-condensation of several substances. The processes of homogeneous nucleation, heterogeneous growth, and coagulations due to Brownian collisions are consid...

An analytical study is presented of the condensation of a pure saturated vapour on a cooled channel plate, including the interaction between the cooling liquid, the condensate and the vapour. The governing equations of co-, counterand cross-current condensation are derived, set dimensionless and solved in closed form. The resulting implicit expressions are evaluated numerically by iteration. In...

We have observed several cloud cores in the Orion B (L1630) molecular cloud in the 2–1 transitions of CO, CO and CO. We use these data to show that a model where the cores consist of very optically thick CO clumps cannot explain their relative intensities. There is strong evidence that the CO is not very optically thick. The CO emission is compared to previous observations of dust continuum emi...

A synthesis of some new thiosemicarbazide like acetyl hexan thiosemicarbazide by condensation of cyclohexylmethylketone with thiosemicarbazide is carried out. And their metal complexes were synthesized by condensation of acetylhexan thosemiocarbazide and different transition metal chloride salt of Cu(II), Co(II), Ni(II),Cd(II),Zn(II),Hg(II) and Fe(III) their characterization are done by differe...

Alcohol dehydrogenation and condensation reactions are involved in chain growth pathways on Cu/MgCeOx promoted with potassium. These pathways lead to the formation of isobutanol with high selectivity via reactions of higher alcohols with methanol-derived C1 species in reaction steps also relevant to higher alcohol synthesis from CO/H2 mixtures at higher pressures on K–Cu/MgCeOx catalysts. Ethan...

The azadithiolate (SCH2NHCH2S) cofactor proposed to occur in the Fe-only hydrogenases forms efficiently by the condensation of Fe2(SH)2(CO)6 (1), formaldehyde, and ammonia (as (NH4)2CO3). The resulting Fe2[(SCH2)2NH](CO)6 reacts with Et4NCN to give (Et4N)2[Fe2[(SCH2)2NH](CO)4(CN)2], for which crystallographic characterization confirmed an axial N-H and an elongated C-S bond of 1.858(3) A. Prima...