Experimental investigation of a turbulent jet carrying heavy particles of a disperse phase

The results are given of an experimental investigation of an immersed jet carrying heavy spherical particles in the case of uniform velocity fields of the particles and the gas and uniform concentration of the particles at the nozzle exit. The laser-optical method was used to measure the velocity fields of the gas and the particles and the concentration of the latter in the flow-rate concentration range of the additive from 0 to 1.5 and particle diameters from 35 to 67 m. It was found that the flow in the jet is essentially nonequilibrium, the disequilibrium and intensity of the mixing in the jet depending on the concentration of the additive and the diameter of the particles. The investigation of the initial section revealed a somewhat anomalous behavior of the jet at a comparatively small (₀=0.5) flow-rate concentration of the additive, and this indicates a need to take into account the prehistory of the flow in the construction of a method for calculating the initial section of a two-phase jet.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 5, pp. 26–31, September–October, 1981.     

Synthesis of hexahydro[2]benzopyrano[3,4-c]pyrroles as serotonin 5-HT2C receptor agonists via intramolecular hetero Diels-Alder reactions

[2]Benzopyrano[3,4-c]pyrroles were synthesized via an intramolecular hetero Diels-Alder reaction. The reaction was applicable to a wide range of substrates and the products could be easily converted into serotonin 5-HT_2C receptor agonists.     

Stereoselective synthesis of tetrahydro-2H-[2]benzopyrano[3,4-c]pyrrol-3-ones and related compounds as precursors of serotonin 5-HT2C receptor agonists

Tetrahydro-2H-[2]benzopyrano[3,4-c]pyrrol-3-ones and the related 3a-methyl-2,3,3a,4,5,9b-hexahydro-1H-benzo[e]isoindole analogues were synthesised by an intramolecular Diels-Alder reaction. The observed stereoselectivity was dependent upon the nature of the tethered dienophile as well as the judicious placement of the amide.     

Generalized Wheland polynomial for large graphs

We report the generalized Wheland polynomial for acyclic graphs depicting polyenes havingn = 10 carbon atoms. We consider the problem of deriving generalized Wheland polynomials for larger chains by recursion. The recursion Wh(n + l;x) =, Wh(n; x) + (1 –x)Wh(n – 1;x) allows one to find the next larger generalized Wheland polynomial for a chain having an even number of vertices by knowing generalized Wheland polynomials of chains having fewer vertices. The recursion, however, does not allow one to predict the generalized Wheland polynomial for a chain having an odd number of vertices from smaller chains! Here we report a procedure which allows one to derive the generalized Wheland polynomial for a chain having an odd number of vertices. This is achieved by combining the coefficients for rings having the same number of vertices. The generalized Wheland polynomials for odd rings are simply related to the generalized Wheland polynomials for smaller chains and can be derived from the information on smaller chains. This makes it possible to extend the recursion for generalized Wheland polynomials for arbitrarily largen.