Observations au mont Keilhau / par V. Akhmatov

http://tartu.ester.ee/record=b1869005~S1*es

Offshore Wind Energy Conversion System Connected to the Electric Grid: Modeling and Simulation

This paper is on modeling and simulation for an offshore wind system equipped with a semi-submersible floating platform, a wind turbine, a permanent magnet synchronous generator, a multiple point clamped four level or five level full-power converter, a submarine cable and a second order filter. The drive train is modeled by three mass model considering the resistant stiffness torque, structure and tower in deep water due to the moving surface elevation. The system control uses PWM by space vector modulation associated with sliding mode and proportional integral controllers. The electric energy is injected into the electric grid either by an alternated current link or by a direct current link. The model is intend to be a useful tool for unveil the behavior and performance of the offshore wind system, especially for the multiple point clamped full-power converter, under normal operation or under malfunctions

MICE SERUM CYTOKINE LEVEL UNDER MUCOSAL IMMUNIZATION WITH OPPORTUNISTIC MICROBIAL ANTIGENS

An important parameter of immunotropic preparation effect is the influence on the production of cytokines that provide the interaction between the effectors of both congenital and adaptive immunity. Cytokine level was determined in the work while using the methods of mucosal immunization with Immunovac-VP-4 and compared with the subcutaneous introduction of this preparation. In case of intranasal and peroral methods of antigen application IL-5, IL-6, and IL-12 expression was found to be elevated, the same was true for IL-1β, IL-5, IL-6, IL-12, and IFN-γ under the subcutaneous immunization. Resulting mice cytokine profile confirmed that irrespective of the method of Immunovac introduction, the activation of immune effectors occurred that was manifested in the increase in proinflammatory and regulatory cytokine levels. It was concluded that the introduction of opportunistic microbial antigens initiated the activation of the cascade of immunologic reactions and under the influence of synthesized cytokines the polarization of immune response was involved that was predominantly of Th1 type

Історія і новизна криптовалют

У статті досліджуються особливості та передумови виникнення криптовалют у світовій економіці. Досліджується історія виникнення криптовалют, їх типи. З’ясовуються особливості функціонування біткоїна та інших криптовалют та сфери їх вжитку