Large Scale Properties of Tilt of Sunspot Groups and Joy's Law Near The Solar Equator

We present a physical mechanism of formation of tilt angles of sunspots due to the process of formation of active regions below the solar photosphere. The contribution of Coriolis force factors on large-scale flows of super-granular convection in turbulent media has been investigated in details. On the basis of earlier works by Kleeorin et al. (2016) and Safiullin et al. (2018) we give physical estimates of orders of magnitude of the effect and estimate the tilt angles near the solar equator, in the "Royal" zone of solar activity. The above model is based on the balance of the small-scale and large scale magnetic helicities and describes in details the sunspot formation process over the last five solar cycles (since 1964). We adopt this model for a wider class of manifestations of solar activity. We present latitudinal dependence of the mean tilt on these five solar cycles and time-latitudinal diagrams over a limited range of latitudes and phases of the solar cycle.Comment: manuscript in Russian, total 17 pages, 4 figures (with Abstract and Figures, Astrophysics[Armenia], accepted for publication in 2019

Competitiveness assessment the construction industry of the Republic of Tatarstan

© 2014, Mediterranean Center of Social and Educational Research. All right reserved. The article presents the results of a study aimed at testing the methodology for assessing the competitiveness of the regional construction sector. Assessment of competitiveness of the construction sector of the regional economy was conducted on three groups of indicators. The first group includes such indicators as the share of unprofitable enterprises in the construction, investment activity (share of investment in output). The second group of indicators includes labor Productivity, capital productivity, tend-vaginitis. The third group includes the ratio of wages in construction with the subsistence minimum working age population in the region, the degree of depreciation of fixed assets in the regional construction, the share of workers of construction organizations, working in conditions that do not meet hygienic standards of working conditions. The study showed that the competitive status of the construction industry of the Republic of Tatarstan within the framework of the three-factor model is the highest in the Volga Federal district. However, several challenges were identified. For example, regional authorities in the management of competitiveness of the construction complex of the region should pay attention to several issues related to performance and business activity in production and working conditions of their workers

Achieving high spatial resolution and high SNR in low-field MRI of hyperpolarised gases with Slow Low Angle SHot

MRI of hyperpolarised gases is usually performed with fast data acquisition to achieve high spatial resolutions despite rapid diffusion-induced signal attenuation. We describe a double-cross k-space sampling scheme suitable for Slow Low Angle SHot (SLASH) acquisition and yielding an increased SNR. It consists of a series of anisotropic partial acquisitions with a reduced resolution in the read direction, which alleviates signal attenuation and still provides a high isotropic resolution. The advantages of SLASH imaging over conventional FLASH imaging are evaluated analytically, using numerical lattice calculations, and experimentally in phantom cells filled with hyperpolarised 3He-N2 gas mixtures. Low-field MRI is performed (here 2.7 mT), a necessary condition to obtain long T2* values in lungs for slow acquisition. Two additional benefits of the SLASH scheme over FLASH imaging have been demonstrated: it is less sensitive to the artefacts due to concomitant gradients and it allows measuring apparent diffusion coefficients for an extended range of times. © 2012 Elsevier Inc. All rights reserved

The triple helix model of innovation

Nowadays in a knowledge-based society, university, industry and government play important roles and form a triple helix in innovation stimulating. Such interaction is the source of the creation and development of incubator movements, research centres and venture capital, which can be private, public or social. The implementation of this model is the basis of favorable innovation climate, as it promotes the development of its components, their combination promotes a synergistic effect, increases innovation activity

Helium-3 gas self-diffusion in a nematically ordered aerogel at low temperatures: Enhanced role of adsorption

© 2017 the Owner Societies. We performed 3 He gas diffusion measurements for the first time in a highly porous ordered Al 2 O 3 aerogel sample at a temperature of 4.2 K using a nuclear magnetic resonance field gradient technique. A strong influence of 3 He adsorption in the aerogel on self-diffusion is observed. The classical consideration of adsorptive gas diffusion in mesopores leads to anomalously high tortuosity factors. The application of a more sophisticated model than the simple combination of empirical two-phase diffusion and the Knudsen gas diffusion models is required to explain our results. Anisotropic properties of the aerogel are not reflected in the observed gas diffusion even at low gas densities where the anisotropic Knudsen regime of diffusion is expected. The observed gas densification indicates the influence of the aerogel attractive potential on the molecular dynamics, which probably explains the reduced diffusion process. Perhaps this behavior is common for any adsorptive gases in nanopores

Double magnetic resonance in MnCO3

© Kazan Federal University (KFU). Results of experiments on MnCO3 investigations by double magnetic resonance are presented. Additional mode of oscillation has been observed in a created Bose-Einstein condensation of magnons state in MnCO3. The properties of observed signals are similar to Goldstone modes

Femtosecond coherent spectroscopy of four-wave mixing and photon echoes in a GaAs/AlGaAs heterostructure at room temperature

The results from experiments employing coherent femtosecond spectroscopy in a layer of two-dimensional electron gas at the boundary of the GaAs/AlGaAs heterojunction at room temperature are presented. The decay curves of primary femtosecond photon echo are obtained. The decoherence time in two-dimensional electron gas depends strongly on the power of the exciting pulse and varies from 36 to 54 fs. The dephasing time is studied for the first time as a function of the power of exciting pulses at room temperature. It is established that this dependence obeys the law T 2 ∼ N -0.22, which differs from the typical law T 2 ∼ N -1 for unscreened electron-electron interaction in semiconductor crystals. Analysis shows that electron-phonon interaction plays an important part along with electron-electron interaction. The induced spin gratings in the GaAs/AlGaAs heterostructure are studied with an eye to their possible application in spintronics. © Allerton Press, Inc., 2012

Investigation of femtosecond photon echo in dye-doped polymer film at room temperature

Signals of primary and stimulated femtosecond photon echo were found and investigated at room temperature in a polyvinyl butyral film doped with phthalocyanine molecules. The decay curve of relative intensity and the spectrum of the signal of primary femtosecond photon echo were recorded. The physical mechanism of formation of such signals in a system of impurity centers excited through the phonon wing of the optical absorption band was discussed. © 2007 by Allerton Press, Inc

Femtosecond photon echo in a dye-doped polymer film and the possibility of coherent optical cooling

The signals of primary and stimulated femtosecond photon echoes are investigated in a dye-doped polymer film at room temperature. The homogeneous S 0 → S 1 spectral line width, which is due to the interaction between the impurity molecules and the quasi-local low-frequency modes, is estimated (≈5 × 10 12 Hz). Special attention is paid to the study of spectra of femtosecond echo signals. The short-wave shifts of these spectra, with respect to the spectrum of femtosecond exciting pulses, are observed. These shifts indicate that the anti-Stokes regime of femtosecond pulse emission is realized. Therefore, the coherent regime of laser cooling of solids appears to be possible. The prospects of using of this new cooling regime in the function of a solid-state optical refrigerator are discussed. © Nauka/Interperiodica 2007