Two dimensional electron gas driven by strong alternating electric field

2D Fermi liquid driven by uniform alternating electric field at zero temperature may remain in quantum coherent non-equilibrium state. We develop a quasistatic approximation for strong and slow ac-fields and solve the problem of driven disordered 2D electron gas in high non-overlapping Landau levels. The broadening of Landau level has the Lorentz form and is inversely proportional to the amplitude of the ac-field. In the absence of electron-phonon interaction the electron distribution function is constant within the last Landau level and the diagonal dc-conductivity is zero. For weak electron-phonon interaction the dc-conductivity is anisotropic. A kinetic transition from the phonon cooling to the phonon heating is predicted.Comment: 8 pages, 1 figure REVTE

On the connection between gamma and radio radiation spectra in pulsars

The model of pulsar radio emission is discussed in which a coherent radio emis-sion is excited in a vacuum gap above polar cap of neutron star. Pulsar X and gamma radiation are considered as the result of low-frequency radio emission inverse Comp-ton scattering on ultra relativistic electrons accelerated in the gap. The influence of the pulsar magnetic field on Compton scattering is taken into account. The relation of radio and gamma radiation spectra has been found in the framework of the model.Comment: 15 pages, 3 figures, Russian version accepted to JETP, partly published in JETP Letters, Vol. 85, #6 (2007

Review of scientific topics for Millimetron space observatory

This paper describes outstanding issues in astrophysics and cosmology that can be solved by astronomical observations in a broad spectral range from far infrared to millimeter wavelengths. The discussed problems related to the formation of stars and planets, galaxies and the interstellar medium, studies of black holes and the development of the cosmological model can be addressed by the planned space observatory Millimetron (the "Spectr-M" project) equipped with a cooled 10-m mirror. Millimetron can operate both as a single-dish telescope and as a part of a space-ground interferometer with very long baseline.Comment: The translation of the original article in Physics Uspekhi http://ufn.ru/ru/articles/2014/12/c

Radiation induced oscillations of the Hall resistivity in two-dimensional electron systems

We consider the effect of microwave radiation on the Hall resistivity in two-dimension electron systems. It is shown that the photon-assisted impurity scattering of electrons can result in oscillatory dependences of both dissipative and Hall components of the conductivity and resistivity tensors on the ratio of radiation frequency to cyclotron frequency. The Hall resistivity can include a component induced by microwave radiation which is an even function of the magnetic field. The phase of the dissipative resistivity oscillations and the polarization dependence of their amplitude are compared with those of the Hall resistivity oscillations. The developed model can clarify the results of recent experimental observations of the radiation induced Hall effect.Comment: 4 pages, 1 figur

Nonlinear effects in microwave photoconductivity of two-dimensional electron systems

We present a model for microwave photoconductivity of two-dimensional electron systems in a magnetic field which describes the effects of strong microwave and steady-state electric fields. Using this model, we derive an analytical formula for the photoconductivity associated with photon- and multi-photon-assisted impurity scattering as a function of the frequency and power of microwave radiation. According to the developed model, the microwave conductivity is an oscillatory function of the frequency of microwave radiation and the cyclotron frequency which turns zero at the cyclotron resonance and its harmonics. It exhibits maxima and minima (with absolute negative conductivity) at the microwave frequencies somewhat different from the resonant frequencies. The calculated power dependence of the amplitude of the microwave photoconductivity oscillations exhibits pronounced sublinear behavior similar to a logarithmic function. The height of the microwave photoconductivity maxima and the depth of its minima are nonmonotonic functions of the electric field. It is pointed to the possibility of a strong widening of the maxima and minima due to a strong sensitivity of their parameters on the electric field and the presence of strong long-range electric-field fluctuations. The obtained dependences are consistent with the results of the experimental observations.Comment: 9 pages, 6 figures Labeling of the curves in Fig.3 correcte

Political Economy and Forecasting Tools

Modern regional development strategies are implemented only for the part that meets the interests of corporations. The national economic approach is ignored. Western models within the framework of economics do not correspond to the state of the Russian economy. The theories of the peripheral economy of the 19th century were not only accepted but also realised during the reform of the economy of the Russian Empire. Loss of value with a “non-market” approach to exchange with other countries was considered as a necessary condition for “industrial education of the nation”. Examples of projects implemented in Siberia demonstrate this clearly. It is no secret that many infrastructure projects, in particular transport projects, are obviously unprofitable. Pipeline transport is created in the interests of mainly large resource-exploiting companies that prefer export destinations. The economic block of our government is focused on maximising cash income, and preferably as soon as possible. It should be recognised that the theories (scientific basis, if any) used to reform the Soviet economy of the 90s did not correspond to the object. Our economy was in a different environment of economic regulation, in which other laws apply. We propose to use the forecasting experience based on spatial models of the national economic level, which are based on the laws of political economy: maximisation of the degree of satisfaction of the needs of the country’s population, the law of planned (propor tional) development and the law of value

Difficulties of diagnostics of epilepsy due to molybdenum cofactor deficiency: a case report

The article presents a clinical study of an infant with rare inherited metabolism disorder – molybdenum cofactor deficiency, for the first time in Russian literature. The onset of disorder – in early neonatal period with a suppression syndrome and myoclonic seizures combined with a burstsuppression electroencephalographic patterns, followed by a reveal of psychomotor delay. Сraniofacial dystrophies were present, including craniostenosis and microcephaly. Somatic status was characterized by hepatolienomegaly, dysmetabolic changes of kidneys’ parenchyma (suggested by ultrasound) and crystalluria. Neuroimaging data were contradictory. Neurosonography results allowed diagnosing concomitant inborn brain development defect: true porencephalia of large hemispheres. However, brain magnetic resonance imaging revealed a picture of diffuse leukomalacia with pseudocyst formation, which were considered a consequence of perinatal brain damage. Magnetic resonance imaging revealed a picture of diffuse leukomalacia with pseudocyst formation, which were considered a consequence of perinatal brain damage. Differential diagnosis was held between the early infantile epileptic encephalopathy (Ohtahara syndrome) and early myoclonic encephalopathy (Aicardi syndrome). However, etiology of the disease remained unclear. To eliminate inherited metabolic disease accompanied by epilepsy, Inherited Epilepsy Panel DNA sequencing was used. The results showed a homozygotic mutation on the exon 6 of MOCS2 gene, leading to deletion of amino acid in position 158 of the protein, which was described before in patients with molybdenum cofactor deficiency (OMIM: 252160)

Structure of the low-lying states of the odd-neutron nuclei with Z ≈ 100

Theoretical investigations of the structure of the low-lying states of the nuclei with Z ≈ 100 play an important role in understanding the properties of nuclei belonging to the new region of the nuclide chart which are now available for the experimental study. We perform the calculations of the excitation energies and the wave functions of the low-lying states of the nuclei with Z ≈ 100. The quasiparticle-phonon model, which takes into account the interaction of quasiparticles with phonons of different multipolarities, is used as a basis for the calculations. The excitation energies and the quasiparticle-phonon structure of the low-lying states with excitation energies up to 1200 keV of the odd-neutron nuclei 245–251Cm, 249–255Cf, 249–259Fm, 253–259No and 257–261Rf are calculated. It is shown that the excitation of the phonons and the quasiparticle-phonon interaction play an important role in the description of the properties of the excited states of the nuclei with Z ≈ 100 with excitation energy exceeding 600 keV