Astrakhan State University

About: Astrakhan State University is a education organization based out in Astrakhan, Russia. It is known for research contribution in the topics: Percolation & Carbamate. The organization has 547 authors who have published 565 publications receiving 2367 citations.

Anthropogenesis and Dynamics of Values Under Conditions of Information Technology Development

Abstract: Entry into the Information Age provided radically new conditions of the modern anthropogenesis–the formation and the development of human beings, their corporality, consciousness, life world, relations with their social world and other persons. In modern society the space of the virtual sphere is extending and becoming dominant, forming a new kind of culture–a digital one. The development of a digital culture is a new form of creative work. After the creation of the second nature–the world of things–human beings created the third nature–the world of virtual phenomena, which is a peculiar composition of the conscious world and the world of modern high information technologies. In such a case it is still paradoxical, that presently human beings exist within two dimensions: The virtual dimension (game or Internet-communication), being a true value for them. The second physically real dimension is instrumental, accompanying and losing its significance in terms of value. interpersonal communication, education, creative work and leisure move from a real sphere into a virtual one. Virtuality is becoming not merely a mediator between a human and the world but truly the world itself. Virtual things are identified with real things in the younger generation’s consciousness. This changing reality model is modifying human beings.

Reactions of 2-benzylidenemalononitrile and 2-nitro-3-phenylacrylonitrile with aryl azides

Abstract: Reactions of 2-benzylidenemalononitrile and 2-nitro-3-phenylacrylonitrile with aryl azides in diethyl ether at room temperature gave mixtures of regioisomeric 1(3)-aryl-5-phenyl-4,5-dihydro-1(3)H-1,2,3-triazole-4,4-dicarbonitriles and 1-aryl-5(4)-phenyl-1H-1,2,3-triazole-5(4)-carbonitriles, respectively. 2-Benzylidenemalononitrile reacted with the same arylazides on heating in boiling chloroform to produce 1-aryl-2-phenylaziridine-2,2-dicarbonitriles.

Decay of a vortex lattice formed by gravity waves on the water surface

Abstract: The generation and decay of a vortex lattice formed by standing gravity waves of 3 Hz frequency on the water surface have been studied experimentally using the particle image velocimetry technique. During the process of excitation the formation of large-scale vortices as a result of interaction of eddies from a vortex lattice is observed. Immediately after the pumping had been turned off in the initial time interval of about 30 s, the time dependence of vortex motion energy E vort close to an exponential decrease was observed with a characteristic time of τ w ≈ 7 s , which is mainly due to the viscous losses of the surface waves. A decrease in wave amplitude leads to reduction in the Stokes drift of floating particles. In the second time interval from 30 to 200 s there is no exponential dependence E vort ( t ) , that is related, apparently, to an energy relaxation of different vortex scales: from the bath size to the pumping wavelength. In this time interval the vortex interaction is also recorded leading to redistribution of energy from the pumping region to large scales. It should be emphasized that the vortex motion generated by the interaction of nonlinear waves is conserved after the complete decay of the wave motion on the water surface, and there is a transfer of energy from small scales to large ones as a result of the process of unification of several lattice vortices into a large-scaled vortex – reverse energy flow. In the time interval above 200 s there is an exponential energy relaxation of vortices of the maximum scale because of the viscous bath bottom and sides friction.

Reactions of 2-Aryl-1,1-dicyanoethenes with L-Proline and Aldehydes

Abstract: Three-component heterocyclization of 2-aryl-1,1-dicyanoethenes with L-proline and aldehydes leads to the formation of 1-aryltetrahydro-1H-pyrrolysines that under acid (alkaline) hydrolysis conditions are converted into derivatives of 6-carboxy-7-phenyl-2,3,5,7a- or 1,3-diaryl-2-carboxy-5,6,7,7a-tetrahydro-1H-pyrrolysine.

Friction stir welding of aluminium and copper alloys

Abstract: Sheet blanks from copper (M1) and aluminium alloys (AD1, AD32) with a thickness of 3 mm are joined in butt joints and overlap, butt joints – overlap joints by friction stir welding (FSW). The micro...