The Ferromagnetism in the Vicinity of Lifshitz Topological Transitions

We show that the critical temperature of a ferromagnetic phase transition in a quasi-two-dimensional hole gas confined in a diluted magnetic semiconductor quantum well strongly depends on the hole chemical potential and hole density. The significant variations of the the Curie temperature occur close to the Lifshitz topological transition points where the hole Fermi surface acquires additional components of topological connectivity due to the filling of excited size-quantization subbands. The model calculations demonstrate that the Curie temperature can be doubled by a small variation of the gate voltage for the CdMnTe/CdMgTe quantum well based device

Magnetic field study of exciton nonradiative broadening excitation spectra in GaAs/AlGaAs quantum wells

Exciton excited states in the quantum well are studied via their effect on the nonradiative broadening of the ground exciton resonance. Dependence of the nonradiative broadening of the ground exciton state on the photon energy of additional laser excitation was measured. Applying magnetic field up to 6 T, we could trace the formation of Landau levels and evolution of the exciton states of size quantization in a 14-nm GaAs/AlGaAs quantum well. Sensitivity of the technique allowed for observation of the second exciton state of size quantization, unavailable for conventional reflectance and photoluminescence spectroscopy. Our interpretation is supported by the numerical calculation of the exciton energies of the heavy-hole and light-hole subsystems. The numerical problems were solved using the finite-difference method on the nonuniform grid. The ground Landau level of the free electron-hole pair was observed and numerically analysed. In addition to energies of the excited states, electron hole distances and exciton-light interaction constant was investigated using the obtained in the numerical procedure exciton wave functions

Результаты длительного мониторинга био-астрономического эффекта Чижевского-Вельховера

The paper provides an analysis of data of metachromasy reaction resulting from a decade of daily monitoring of staining of yeasts volutin grains with methylene blue under standard laboratory conditions. During 9 years (from 2001 to 2009) of observations the direct monotonic correlation between the response of metachromasy and intensity of cosmic rays was marked. The results of observations in 2010 showed differ, from the previous years, tendencies in the reaction and possess no correlation with the known Cosmo-physical factors.В работе приведен анализ данных реакции метахромазии, полученных в результате десятилетнего ежедневного мониторинга окраски метиленовым синим волютиновых гранул клеток дрожжей в стандартных лабораторных условиях. В течение 9 лет (2001–2009гг.) отмечалась значимая прямая монотонная зависимость между реакцией метахромазии и интенсивностью космических лучей. Показано, что результаты наблюдений в 2010г. отличаются от установленного ранее хода реакции и не имеют корреляционной связи с известными космофизическими факторами

Calculation of thermal parameters of SiGe microbolometers

The thermal parameters of a SiGe microbolometer were calculated using numerical modeling. The calculated thermal conduction and thermal response time are in good agreement with the values found experimentally and range between 2x10$^-7$ and 7x10$^-8$ W/K and 1.5 and 4.5 ms, respectively. High sensitivity of microbolometer is achieved due to optimization of the thermal response time and thermal conduction by fitting the geometry of supporting heat-removing legs or by selection of a suitable material providing boundary thermal resistance higher than 8x10$^-3$ cm$^2$K/W at the SiGe interface.Comment: 11 pages, 6 figure

The Polarized H and D Atomic Beam Source for ANKE at COSY-J\"ulich

A polarized atomic beam source was developed for the polarized internal storage-cell gas target at the magnet spectrometer ANKE of COSY-J\"ulich. The intensities of the beams injected into the storage cell, measured with a compression tube, are $7.5\cdot 10^{16}$ hydrogen atoms/s (two hyperfine states) and $3.9\cdot 10^{16}$ deuterium atoms/s (three hyperfine states). For the hydrogen beam the achieved vector polarizations are $p_{\rm z}\approx\pm0.92$. For the deuterium beam, the obtained combinations of vector and tensor ($p_{\rm zz}$) polarizations are $p_{\rm z}\approx\pm 0.90$ (with a constant $p_{\rm zz}\approx +0.86$), and $p_{\rm zz}=+0.90$ or $p_{\rm zz}=-1.71$ (both with vanishing $p_{\rm z}$). The paper includes a detailed technical description of the apparatus and of the investigations performed during the development.Comment: 18 pages, 26 figures, 4 table

Proteism in a cinematic portrait of a woman-philosopher

The article analyzes the image of a woman philosopher, created by modern culture, on the material of feature cinematography. Revealing a set of characteristics that belong to a woman-philosopher in the collective representations that are broadcast in motion pictures allows performing a double research vision: 1) analysis of the cultural era to which the heroine of the biopic belonged; a specific philosophical concept created by her; 2) diagnostics of the culture that created the cinematic portrait of a woman-philosophe