Elastic and strength characteristics of a glass-reinforced plastic in compression

The elastic constant and strength characteristics in compression have been experimentally determined for a cold-cured glass-reinforced plastic in the direction of all three principal axes of anisotropy. It is shown that the elastic constants obtained satisfy the constraints imposed on orthotropic materials by the thermodynamic relations.Translated from Mekhanika Polimerov, No. 5, pp. 866–869, September–October, 1970.     

Progress in development of Nuclotron accelerator complex

The Nuclotron superconducting synchrotron was constructed in 1987–1992 [1]; it is the world’s first synchrotron based on fast cycling “window frame” electromagnets with a superconducting coil. For a design field of dipole magnets of 2 T, the magnetic rigidity is 45 T m, which corresponds to the energy of heavy nuclei (for example, gold) of 4.5 GeV/nucleon. The Nuclotron accelerator complex is currently being upgraded (the Nuclotron-M project); this upgrade is considered a key part of the first stage of fulfilling the new Joint Institute for Nuclear Research (JINR) project: the Nuclotron-based Ion Collider fAcility and Multi-Purpose Detector (NICA/MPD). The most important task of this new project is the preparation of basic Nuclotron systems for its reliable operation as part of the NICA accelerator complex. Basic results of activity on the project, which started in 2007, are presented and the results of the last Nuclotron runs are analyzed.     

Upgrade of Nuclotron power supply system

One of the trends of Nuclotron development lies in modifying the power supply system and upgrading the energy evacuation system of structural magnets in order to provide reliable durable operation of the synchrotron at a dipole magnet field level of 2 T. This is necessary for Nuclotron operation as part of the injection chain of the heavy-ion NICA collider under design at JINR and for the current program of physical studies. The principles of construction and specific features of the existing system based on a separate power supply of structural dipole and quadrupole magnetic elements are considered. The main provisions of the upgrade of the power supply system, structural and schematic diagrams, control schemes, and energy evacuation switch schemes from superconducting elements are presented.     

Test Beams of the LPI Accelerating Complex Pakhra

Physics of Atomic Nuclei - In this paper, we report the characteristics of the generated beams, the extracted electron beam and the beam of secondary electrons/positrons, of the LPI accelerator...     

The revision of the model of primary energy conversion in purple bacteria

A simulation method is suggested which enables one to check whether a model for excitation energy exchange in an ensemble of dye molecules fits available experimental data. In particular, this method may deal with photosynthetic units (PSUs) in which excitation migration in antenna chlorophylls and their substantial trapping in reaction centers (RCs) take place. Its application to the purple bacteria has proved that the model, which was generally accepted during the last 20-30 years, is in contradiction with recent experimental facts and thus requires modernization. Two physical mechanisms are discussed: femtosecond polarization of mobile hydrogen atoms near the reaction center special pair ("water latch"), and the presence of excitons delocalized over several core-bacteriochlorophylls (BChls). Our considerations give evidence that neither of these mechanisms alone can resolve the conflict, but their cumulative action appears to be sufficient. Unfortunately, these mechanisms were as yet only partially addressed experimentally.