Shock compression of liquid nitrogen at a pressure of 320 GPa

The experimental data on the shock compression of liquid nitrogen in the megabar pressure range are reported. The experiments have been performed with a spherical measuring setup in which pressure is created by the impact of a steel shell accelerated to a velocity of 23 km/s on the samples. The density of shock-compressed nitrogen at a pressure of about 320 GPa is about 3.4 g/cm³ (compression degree of about 4.2). The experimental data are described using a model equation of state.     

Geometric and electronic structure of an N,N′-ethylene-bis(salicylaldiminato) zinc(II) molecule,ZnO<Subscript>2</Subscript>N<Subscript>2</Subscript>C<Subscript>16</Subscript>H<Subscript>14</Subscript>

Gas electron diffraction at a temperature T of 641(5) K is used to study the structure of an N,N′-ethylenebis(salicylaldiminato) zinc(II) molecule, ZnO₂N₂C₁₆H₁₄, further Zn(salen). The structure of a gaseous Zn(salen) complex has C ₂ symmetry and is characterized by a substantial turn of two chelating fragments of the ligand with respect to each other, and also by a big difference in the length of coordination bonds: r _h1(Zn-O)=1.902(7) Å r _h1(Zn-N)= 2.027(7) Å. Results of the DFT/B3LYP calculation with 6-31G* and CEP,TZV basis sets of the molecule structure well agree with the experimental data. The electronic structure of Ni(salen), Cu(salen), Zn(salen), and Zn(acacen) molecules is considered.     

Effect of the gas flow geometry and turbulence on the hydrodynamic drag of a body in the flow

The effect of the incoming flow geometry on the hydrodynamic drag of a body is investigated in a numerical experiment simulating a free gas flow past a sphere as well as flows in cylindrical tubes of various radii, in a confuser, and a diffuser. The results of calculations lead to the conclusion that the confinement of the flow by the tube walls, its contraction and expansion may change the hydrodynamic force and the drag acting on the body insignificantly (not more than by 30%). This cannot explain the early drag crisis, in which the values of these quantities decrease by 4–7 times for Reynolds numbers on the order of 100. This phenomenon is explained theoretically by the effect of strong turbulence of the incoming flow to the body.     

Modeling of the low-temperature production of gas-sensitive tin oxide films

The deposition of tin oxide films by reactive sputtering of a stoichiometric target is investigated. Conditions are determined for the formation of a crystal layer structure and the acquisition of gas sensitivity without subsequent high-temperature annealing. Zh. Tekh. Fiz. 69, 112–113 (April 1999)     

Methyl 3-amino-1H-indole-2-carboxylates in the synthesis of 5H-pyrimido[5,4-b]indole derivatives

Russian Journal of Organic Chemistry - Reactions of methyl 3-amino-1H-indole-2-carboxylates with aryl isocyanates, aryl isothiocyanates, and cyanamides led to the formation of...     

Structures of condensation products of ortho-aminophenols with ninhydrin

Condensation of ortho-aminophenols and N-benzylsulfonyl-o-phenylenediamine with ninhydrin afforded tetracyclic products, the amino group entering into condensation with the carbonyl group at position 1 of ninhydrin. The structures of the reaction products were established by ¹H NMR spectroscopy and X-ray diffraction analysis.     

Features of the electronic structure of the intermetallic Co3Ti in an atomically disordered state

Using a method based on incorporating statistics into the theory of multiple scattering via the distribution function of atoms on lattices, the electronic structure of the intermetallic Co₃Ti is calculated for both complete atomic order and complete disorder. An unusual feature of the electronic structure of this intermetallic when it is disordered in the solid state is identified. Possible consequences of this behavior are analyzed. Fiz. Tverd. Tela (St. Petersburg) 39, 809–810 (May 1996)     

Effect of the nature of titania on the activity of Cu?Ti?O catalysts for selective catalytic reduction of nitrogen oxides with ammonia

The activity of Cu–Ti oxide catalysts has been studied in the selective catalytic reduction of NO with ammonia. We have elucidated how the nature ofstarting titania affects the catalyst activity in this reaction.     

Combined pulse microcatalytic and ESR studies of butylene oxidation on V-Mg oxide catalysts

Abstract The behavior of V–Mg oxide catalysts in both steady and non-steady state butylene oxidation has been examined.

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