720 research outputs found
Singularities inside non-Abelian black holes
Singularities inside static spherically symmetric black holes in the SU(2)
Einstein-Yang-Mills and Einstein-Yang-Mills-dilaton theories are investigated.
Analytical formulas are presented describing oscillatory and power law metric
behavior near spacelike singularities in generic solutions.Comment: REVTeX, 9 pages, 2 EPS figures, uses epsf.st
On the proper time of the earthquake source
The concept of proper time, which is different from universal time, has been
introduced into the physics of earthquakes. The global activity of strong
earthquakes was chosen as the object of study. We consider the sequence of
earthquakes as a random process of the Poisson type. Comparatively weak
earthquakes are used as the underground clock, the ticking of which marks the
course of proper time. The Poisson distribution is compared with the
distributions for two sequences of strong earthquakes. One of the sequences is
ordered by calendar time, and the second by proper time. The result of the test
showed that the distribution of events ordered by proper time is closer to the
Poisson distribution than the distribution of events ordered by calendar time.
We explain this by non-stationarity, which is an immanent property of the
Earth's lithosphere.Comment: 9 pages, 5 figure
Contributions of spontaneous phase slippage to linear and non-linear conduction near the Peierls transition in thin samples of o-TaS_3
In the Peierls state very thin samples of TaS_3 (cross-section area \sim
10^{-3} mkm^2) are found to demonstrate smearing of the I-V curves near the
threshold field. With approaching the Peierls transition temperature, T_P, the
smearing evolves into smooth growth of conductance from zero voltage
interpreted by us as the contribution of fluctuations to the non--linear
conductance. We identify independently the fluctuation contribution to the
linear conductance near T_P. Both linear and non-linear contributions depend on
temperature with close activation energies \sim (2 - 4) x 10^3 K and apparently
reveal the same process. We reject creep of the {\it continuous} charge-density
waves (CDWs) as the origin of this effect and show that it is spontaneous phase
slippage that results in creep of the CDW. A model is proposed accounting for
both the linear and non-linear parts of the fluctuation conduction up to T_P.Comment: 6 pages, 5 Postscript figure, RevTeX, accepted for publication in PR
Power supply of autonomous systems using solar modules
The article shows the methods of constructing autonomous decentralized energy systems from solar modules. It shows the operation of up DC inverter. It demonstrates the effectiveness of DC inverters with varying structure. The system has high efficiency and low level of conductive impulse noise and at the same time the system is practically feasible. Electrical processes have been analyzed to determine the characteristics of operating modes of the main circuit elements. Recommendations on using the converters have been given
Impurity-induced stabilization of Luttinger liquid in quasi-one-dimensional conductors
It is shown theoretically that the Luttinger liquid phase in
quasi-one-dimensional conductors can exist in the presence of impurities in a
form of a collection of bounded Luttinger liquids. The conclusion is based upon
the observation by Kane and Fisher that a local impurity potential in Luttinger
liquid acts, at low energies, as an infinite barrier. This leads to a discrete
spectrum of collective charge and spin density fluctuations, so that interchain
hopping can be considered as a small parameter at temperatures below the
minimum excitation energy of the collective modes. The results are compared
with recent experimental observation of a Luttinger-liquid-like behavior in
thin NbSe and TaS wires.Comment: 11 pages, revtex, final version published in JETP Lett
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