Measurement of the ground state 2n pickup probability for 28Si+68Zn and its role in sub-barrier fusion enhancement

The ground state and excited state transfer yields for the 2-neutron pickup channel in the ²⁸Si+⁶⁸Zn system have been measured explicitly. The recoil mass separator at the nuclear Science Centre, New Delhi was used for the measurement. A NaI(T1) detector was used for detecting the deexcitation γ’s from the transfer products. The kinematic coincidence technique was employed for the transfer measurement. Simplified coupled channels calculations show that out of all transfer channels the major contribution to the sub-barrier enhancement comes from the ground state 2 neutron pickup channel with a ground state Q-value of+1.83 MeV.     

Oxygen-containing Heterocyclic Compounds from 1,5-Diketones. (Review)

Literature and characteristic experimental data correlated in the review concern the intramolecular cyclization by various means of substituted 1,5-diketones of the acyclic, semi-, and bicyclic series, proceeding to the formation of oxygen-containing heterocycles, such as pyrans, pyrylium salts, di- and tetrahydrofurans, and their condensed analogs, aroylfurans etc.     

New method for synthesis of 2,5-disubstituted thiophenes

The use of hydrogen sulfide at the moment of formation is proposed for the recyclization of furans into thiophenes in acidic media. The advantages of this method are shown.N. G. Chernyshevskii Saratov State University, Saratov 410026, Russia. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 736–738, June, 1999.     

Free Convective Nonaligned Non-Newtonian Flow with Non-linear Thermal Radiation

The present study explores the free convective oblique Casson fluid over a stretching surface with non-linear thermal radiation effects. The governing physical problem is modelled and transformed into a set of coupled non-linear ordinary differential equations by suitable similarity transformation, which are solved numerically with the help of shooting method keeping the convergence control of 10^-5 in computations. Influence of pertinent physical parameters on normal, tangential velocity profiles and temperature are expressed through graphs. Physical quantities of interest such as skin friction coefficients and local heat flux are investigated numerically.     

Reaction of perchlorates of condensed thiopyrylium derivatives with aromatic aldehydes

The synthesis of new monomethinecyanines from 2.3-trimethylene- and 2-phenyl-5,6,7,8-tetrahydrothiochromylium, 2-phenyl-5,6-trimethylenethiopyrylium, sym-octahydrothioxanthylium and sym-octahydroxanthylium perchlorates and aromatic aldehydes is described.     

Formation of nitrogen heterocycles in the hydroamination of 1,5-diketones

It was established that the principal pathway in the catalytic hydro(alkyl,aryl)-amination of 1,5-diketones is, depending on the structure of the diketone and the amine component, the stereospecific formation of substituted piperldines, octa- and decahydroquinolines, and perhydroacridines or pyridine and tetrahydro- and benzodihydroquinoline structures.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 944–947, July, 1982.