Exact General Relativistic Disks with Magnetic Fields

The well-known ``displace, cut, and reflect'' method used to generate cold disks from given solutions of Einstein equations is extended to solutions of Einstein-Maxwell equations. Four exact solutions of the these last equations are used to construct models of hot disks with surface density, azimuthal pressure, and azimuthal current. The solutions are closely related to Kerr, Taub-NUT, Lynden-Bell-Pinault and to a one-soliton solution. We find that the presence of the magnetic field can change in a nontrivial way the different properties of the disks. In particular, the pure general relativistic instability studied by Bicak, Lynden-Bell and Katz [Phys. Rev. D47, 4334, 1993] can be enhanced or cured by different distributions of currents inside the disk. These currents, outside the disk, generate a variety of axial symmetric magnetic fields. As far as we know these are the first models of hot disks studied in the context of general relativity.Comment: 21 pages, 11 figures, uses package graphics, accepted in PR

Оценка технических возможностей использования отработавших тепловыделяющих сборок реактора ВВЭР-1200 в качестве источника гамма-излучения для радиационно-технологических процессов

Possibility in principle of VVER-1200 spent fuel assemblies utilization as a source of gamma radiation for radiotechnology is grounded. The possibility is revealed because of high burn­up fraction of nuclear fuel in recent power reactors.Обосновывается принципиальная возможность использования отработавших тепловыделяющих сборок реактора ВВЭР-1200 в качестве источника гамма-излучения для решения задач радиационной технологии. Такая возможность открывается благодаря высокой глубине выгорания ядерного топлива в современных энергетических реакторах

Quasielastic neutron scattering experiment on water using TOFLAR (Time Of Flight and LARmor precession) technique at SNS

We present the results of the first TOFLAR (Time Of Flight and LARmor precession) experiment with a Larmor modulation device positioned after the sample. Using a setup based on the configuration of the SNS-NSE spectrometer (Spallation Neutron Source, USA), we did TOFLAR measurements on water at 5 and 20 degree Celsius, analyzed the spectra, and obtained diffusion coefficient values that are in a reasonable agreement with literature. Thus, our results demonstrate that TOFLAR may become a standard technique to study quasielastic neutron scattering in future

Quasielastic neutron scattering experiment on water using TOFLAR (Time Of Flight and LARmor precession) technique at SNS

We present the results of the first TOFLAR (Time Of Flight and LARmor precession) experiment with a Larmor modulation device positioned after the sample. Using a setup based on the configuration of the SNS-NSE spectrometer (Spallation Neutron Source, USA), we did TOFLAR measurements on water at 5 and 20 degree Celsius, analyzed the spectra, and obtained diffusion coefficient values that are in a reasonable agreement with literature. Thus, our results demonstrate that TOFLAR may become a standard technique to study quasielastic neutron scattering in future

End-User Development in Industry 4.0: Challenges and Opportunities

This position paper aims to discuss challenges and opportunities related to human-computer interaction technologies for Industry 4.0 and to explore the role that end-user development can play in new industrial scenarios. The paper highlights the gap between what Industry 4.0 and related enabling technologies promise and how the Operator 4.0 will be called on to change his/her work practice. End-user development and meta-design are here proposed as suitable methods to fill this gap and improve operators’ quality of work