Stress state of hollow orthotropic noncircular cylinders under a local load

S. P. Timoshenko Mechanics Institute, National Academy of Sciences of the Ukraine, Kiev. Technical Center, National Academy of Sciences of the Ukraine, Kiev. Translated from Prikladnaya Mekhanika, Vol. 31, No. 5, pp. 3–11, May, 1995.     

G-primitive extensions of differential fields

A classification is given of the G-primitive extensions of a partial differential field of characteristic zero with an algebraically closed field of constants and a connected algebraic group G.Translated from Matematicheskie Zametki, Vol. 23, No. 3, pp. 425–434, March, 1978.     

Propagation of detonation waves in electric and magnetic fields appearing as a result of concentrated energy input

The propagation of detonation waves in an electromagnetic field is investigated. The effect of a constant external electromagnetic field on the motion of the detonation wave and the combustion products behind the wave is analyzed for small magnetic Reynolds numbers. The detonation is initiated by a plane point explosion.     

Mechanism of Metallo-β-Lactamase Inhibition by Oxacephalosporin Antibiotic

Metallo-β-lactamases is a family of bacterial zinc-dependent enzymes that hydrolyze β-lactam antibiotics and are responsible for the bacterial resistance to them. As a result of the reaction, the slowly hydrolyzed substrate moxalactam undergoes not only chemical transformations in the structure of the β-lactam ring but a negatively charged fragment is also released on the periphery of the molecule, resulting in the formation of an intermediate firmly bound to the active site. In the paper, we present the results of the calculations of the mechanism of this process by a combined quantum mechanics/molecular mechanics approach.     

Stress state of layered hollow cylinders with irregularly shaped cross-section

The stress state of longitudinally corrugated layered hollow orthotropic elliptic cylinders is determined using discrete Fourier series for different geometrical parameters. The results obtained are presented in the form of plots and tables and analyzed