We discuss the results of the experiments registering different types of radiation of thunderstorm clouds at Tian Shan High-Altitude Scientific Station of the Physical Institute of the Academy of ...Sciences. A series of events was found, in which spatial correlation of short gamma-quantum bursts (10–250 keV) and radio-frequency emission (0.1–30 MHz) with the passage of thunderstorm clouds over the facility is observed, as well as temporal correlation of the bursts of this radiation with lightning discharges and the passage of extensive atmospheric showers. One can assume that the observed bursts of gamma radiation are experimental proof of the realization of the runaway-electron breakdown effect.
The formation of amorphous metal nanoparticles by the method of electrohydrodynamic dispersion is studied. In this method, fine liquid metal drops are generated, charged in an electron beam to an ...unstable state, and dispersed into nanometer droplets. Rapid cooling of these nanometer droplets results in the formation of amorphous metal nanoparticles. The chief problem in the formation of such particles is that it is difficult to charge molten metal drops to an unstable state, since the bombardment of the drop by an electron beam may cause intense emission of electrons. To overcome this difficulty, the drops are charged by a beam of slow electrons. Charging proceeds in such a way that the electron energy rises with the drop’s charge. It is shown that this method makes it possible to obtain granulated films made up of amorphous metal particles. Copper films with a nanoparticle mean size of 2 nm and a small dimensional variation are prepared.
We discuss the importance of the vortex core energy and realistic boundary conditions to the Fokker-Plank equation for the calculation of thermally activated hopping of vortices across narrow ...superconducting films. Disregard of these issues in the papers by Bulaevskii, Graf and Kogan, Phys. Rev. B 85, 014505 (2012) (http://dx.doi.org/10.1103/PhysRevB.85.014505) and by Bulaevskii et al., Phys. Rev. B 83, 144526 (2011) (http://dx.doi.org/10.1103/PhysRevB.83.144526) in which an uncertain London vortex core cutoff was used, can produce large numerical errors and a significant discrepancy between their results and the results of the paper by Gurevich and Vinokur, Phys. Rev. Lett. 100, 227007 (2008) (http://dx.doi.org/10.1103/PhysRevLett.100.227007) in which these issues were taken into account. This can be essential for the interpretation of experimental data on thin-film photon detectors and other superconducting nanostructures.
This case report describes a unique transmission of Vibrio vulnificus infection. A 38-year-old woman with recurrent cellulitis and chronic ulcer on her leg developed necrotizing cellulitis and sepsis ...caused by V. vulnificus. Meticulous history investigation revealed the link to contaminated fish blood that had been applied on the ulcer by a traditional healer. Through this case, it may be stressed that a traditional remedy can sometimes be harmful and life-threatening.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
This lengthy review is devoted to large-scale electric fields in the Earth's magnetosphere. Such fields play an important part in the dynamics of the magnetosphere and the ionosphere. They determine ...the convection in the magnetosphere, drifts and currents in the ionosphere, variations of the geomagnetic field, and the stability and inhomogeneous structure of the magnetosphere and ionosphere. The following list of topics is covered in considerable detail: the electric field potential; conductivity of the ionosphere and magnetosphere; electric currents; magnetic field disturbances; plasma convection (electric field of rotation); electric field in the low latitude ionosphere; and electric fields and currents in the high latitude ionosphere. A mathematical appendix is included.
An overview of the theory of the upper critical field in dirty two-gap
superconductors, with a particular emphasis on MgB$_2$ is given. We focus here
on the maximum $H_{c2}$ which may be achieved by ...increasing intraband
scattering, and on the limitations imposed by weak interband scattering and
paramagnetic effects. In particular, we discuss recent experiments which have
recently demonstrated ten-fold increase of $H_{c2}$ in dirty carbon-doped films
as compared to single crystals, so that the $H_{c2}(0)$ parallel to the ab
planes may approach the BCS paramagnetic limit, $H_pT = 1.84T_cK \simeq
60-70T$. New effects produced by weak interband scattering in the two-gap
Ginzburg-Landau equations and $H_{c2}(T)$ in ultrathin MgB$_2$ films are
addressed.
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