Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: AAT.2011.6.2-1.;AAT.2011.6.3-1. | Award Amount: 5.07M | Year: 2011
The MAAT project aims to investigate aerial transportation possibility by airship based cruiser-feeder system. MAAT is composed by tree modules : - the cruiser, named PTAH, (acronym of Photovoltaic Transport Aerial High altitude system); - the feeder, named ATEN (Aerial Transport Elevator Network feeder), is a VTOL system (Vertical Take Off and Landing) which ensure the connection between the cruiser and the ground; - the vertical airport hub, named AHA (Airport Hub for Airship feeders). The feeder can lift up and down by the control of buoyancy force and displace horizontally to join to cruiser. The project aims to: 1. identify and design the best type of propulsion for the PTAH, a discoid innovative airship able to remain airborne for long periods and to travel great distances, in order to reduce the environmental impact against the present sys-tem, as fuel consumption is null, both cruiser and feeder are energetically autonomous by photovoltaic energy and innovative electric propulsion. 2. study the different possible ways of approaching and joining between ATEN and PTAH, and consequently, the re-lease of ATEN from PTAH. 3. design the best procedure of docking operations thus identified in order to obtain the minimum disruption to pas-sengers and the maximum safety for themselves and for goods 4. study the different architectures of PTAH and Athens, in such a way that : 5. the lift up capacity guaranteed by the buoyancy force, may be accompanied by the power of the engines; 6. effective and safe procedures for docking; 7. ATEN can land and take off from Airport Hubs named AHA located in major populated centres 8. PTAH satisfies the better possible aerodynamic performances possible for the dimensions and the operative mis-sion. To study the transfer operations between ATEN and PTAH of goods and people and vice versa, to: minimize distress conditions for passengers, maximize performances especially for goods; enhance safety of these operations to maximum possible level. The objectives described are congruent with each other and to achieve this the study of the system and components must be highly structured.
Nath B.B.,Raman Research Institute |
Shchekinov Y.,Southern Federal University
Astrophysical Journal Letters | Year: 2013
We point out that the commonly assumed condition for galactic outflows, that supernovae (SNe) heating is efficient in the central regions of starburst galaxies, suffers from invalid assumptions. We show that a large filling factor of hot (≥106 K) gas is difficult to achieve through SNe heating, irrespective of the SN's initial gas temperature and density, its uniformity, or its clumpiness. We instead suggest that correlated supernovae from OB associations in molecular clouds in the central region can drive powerful outflows if the molecular surface density is >103 M ⊙ pc-2. © 2013. The American Astronomical Society. All rights reserved.
Ruban D.A.,Southern Federal University
Proceedings of the Geologists' Association | Year: 2010
Geodiversity, i.e., a diversity of geological heritage sites, can be quantified with an account of geosite types, type counterparts, and their ranks. Higher numbers of geosite types represented within a given territory and their higher ranks indicate a higher geodiversity. Two additional characteristics, namely geoabundance and georichness, allow measure of the quantity of geosites and the diversity-quantity relationship respectively. Geodiversity loss can be evaluated with an accounting of decreases in geosite type ranks linked to the damage of geosites. A calculation of relative and multi-dimensional geodiversity helps in quantitative assessment of the regional geological heritage. © 2010 The Geologists' Association.
Yuzyuk Y.I.,Southern Federal University
Physics of the Solid State | Year: 2012
Raman investigations of the crystal lattice dynamics in classical ferroelectric perovskites SrTiO 3, PbTiO 3, and BaTiO 3 have been analyzed. The specific features revealed in the behavior of soft modes during the phase transitions occurring in ceramics and powders of these compounds, as well as in several related solid solutions, have been described. Particular attention has been paid to the investigations of ferroelectric thin films and superlattices in which the sequences of structural distortions can be radically different from those known for the initial bulk materials. © 2012 Pleiades Publishing, Ltd.
Vasiliev E.O.,Southern Federal University
Monthly Notices of the Royal Astronomical Society | Year: 2013
We present self-consistent calculations of non-equilibrium (time-dependent) cooling rates for a dust-free collisionally controlled gas in wide ranges of temperature (10 ≤ T ≤ 108K) and metallicity (10-4 ≤ Z ≤ 2 Z⊙). We confirm that molecular hydrogen dominates cooling at 102 ≤ T ≤ 104K and Z ≤ 10-3 Z⊙.We find that the contribution fromH2 into the cooling rate around T~(4-5)×103K stimulates thermal instability in themetallicity range Z ≤ 10-2 Z⊙. Isobaric cooling rates are generally lower than isochoric cooling rates, because the associated increase of gas density leads to both more efficient hydrogen recombination and equilibration of the fine-structure level populations. Isochoric cooling means that the ionization fraction remains quite high at T ≤ 104K - up to ~0.01 at T ≤ 103K and Z ≤ 0.1 Z⊙, and even higher at higher metallicity - unlike isobaric cooling, where it is at least an order of magnitude lower. Despite this increase in ionization fraction, the gas-phase formation rate ofmolecular hydrogen (via H-) decreases with metallicity, because higher metallicity shortens the evolution time. We implement our self-consistent cooling rates into the multidimensional parallel code ZEUS-MP in order to simulate the evolution of a supernova remnant. We compare it to an analogous model with tabulated cooling rates published in previous studies. We find significant differences between the two descriptions, which might appear, for example, in the mixing of the ejected metals in the circumstellar medium. © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Minkin V.I.,Southern Federal University
Russian Chemical Reviews | Year: 2013
Modern concepts of mechanisms of thermal and photochemical rearrangements responsible for the photo-chromic properties of spiropyrans, spirooxazines, spiroper-imidines and metal bis(chelate) complexes have been considered. The most important applications of spiropyrans and spirooxazines as light-controlled molecular switches of physical and biological properties of hybrid molecular and supramolecular structures and macroscopic materials have been discussed. The bibliography includes 185 references. © 2013 Russian Academy of Sciences and Turpion Ltd.
Mazuritskiy M.I.,Southern Federal University
Journal of Synchrotron Radiation | Year: 2012
Here, soft X-ray synchrotron radiation transmitted through microchannel plates is studied experimentally. Fine structures of reflection and XANES Si L-edge spectra detected on the exit of silicon glass microcapillary structures under conditions of total X-ray reflection are presented and analyzed. The phenomenon of the interaction of channeling radiation with unoccupied electronic states and propagation of X-ray fluorescence excited in the microchannels is revealed. Investigations of the interaction of monochromatic radiation with the inner-shell capillary surface and propagation of fluorescence radiation through hollow glass capillary waveguides contribute to the development of novel X-ray focusing devices in the future. © 2012 International Union of Crystallography Printed in Singapore - all rights reserved.
Vasiliev E.O.,Southern Federal University
Monthly Notices of the Royal Astronomical Society | Year: 2011
Non-equilibrium (time-dependent) cooling rates and ionization state calculations are presented for low-density gas enriched with heavy elements (metals) and photoionized by external ultraviolet/X-ray radiation. We consider a wide range of gas densities and metallicities and also two types of external radiation field: a power-law and an extragalactic background spectra. We have found that both cooling efficiencies and ionic composition of enriched photoionized gas depend significantly on the gas metallicity and density, the flux amplitude and the shape of ionizing radiation spectrum. The cooling rates and ionic composition of the gas in non-equilibrium photoionization models differ strongly (by a factor of several) from those in photoequilibrium due to overionization of the ionic states in the non-equilibrium case. The difference is maximal at low values of the ionization parameter and similar in magnitude to that between the equilibrium and non-equilibrium cooling rates in the collisionally controlled gas. In general, the non-equilibrium effects are notable at T≲ 106K. In this temperature range, the extent of mismatch between the two ionic states and their ratios between the photoequilibrium and the photo-non-equilibrium models reach a factor of several. The net result is that the time-dependent energy losses due to each chemical element (i.e. the contributions to the total cooling rate) differ significantly from the photoequilibrium ones. We advocate the use of non-equilibrium cooling rates and ionic states for gas with near-solar (and above) metallicity exposed to an arbitrary ionizing radiation flux. We provide a parameter space (in terms of temperature, density, metallicity and ionizing radiation flux), where the non-equilibrium cooling rates are to be used. More quantitatively, the non-equilibrium collisional cooling rates and ionization states are a better choice for the ionization parameter log U≲-5. The difference between the photoequilibrium and the photo-non-equilibrium decreases with the ionization parameter growth, and the photoequilibrium can be used for ionization parameter as high as log U≳-2 for Z≲ 10-2Z⊙ and log U≳ 0 for Z∼Z⊙. Thus, the non-equilibrium calculations should be used for the ionization parameter range between the above-mentioned values. In general, where the physical conditions favour collisional ionization, the non-equilibrium (photo)ionization calculations should be conducted. © 2011 The Author Monthly Notices of the Royal Astronomical Society © 2011 RAS.
Ruban D.A.,Southern Federal University
Geoscience Frontiers | Year: 2015
Abstract Global sea-level has changed in a cyclic manner through geologic history, but the regularities of these changes are yet to be fully understood. Despite certain (and sometimes significant) differences, the available Mesozoic eustatic curves permit the outlining of long-term eustatic cycles, which are provisionally defined as cycles recognizable at the stage level and higher. Interpretation of the Triassic eustatic curves indicates two orders of long-term cycles and a 1st-order sea-level rise throughout the entire period. The Jurassic eustatic curves imply cyclicity of one or two orders, and a 1st-order eustatic rise during the entire period is also evident. Most challenges are interpretations for the Cretaceous; two to four orders of long-term eustatic cycles can be established for this period. Generally, the hierarchy of the long-term eustatic cycles might have changed through the Mesozoic. If so, and if one considers differences of cycles of the same order between the periods of this era, it is difficult to apply "standard" hierarchical classifications to the documented cycles. The hypothetical uncertainty of the hierarchy of the Mesozoic long-term eustatic cycles is an important challenge for modern researchers. © 2015 China University of Geosciences (Beijing) and Peking University.
Ruban D.A.,Southern Federal University
Gondwana Research | Year: 2011
Global sea-level rise and consequent regional transgressions are hypothesized at the beginning of the Devonian. A brief review of lithostratigraphical data available from three regions of the "Tethyan" margin of Gondwana, namely Northern Africa, Arabia, and the Tethys Himalaya, suggests that all of them were characterized by a regressive setting in the Lochkovian. In contrast, data from some terranes of the Greater Galatian Superterrane provide evidence of early Lochkovian transgression. The regressive setting documented on the 'Tethyan' margin of Gondwana differs from the transgressive-regressive cycles of Euramerica and the norm of global sea-level rise followed by a highstand. Only regional tectonic processes including those linked with dynamic topography could explain these differences. These processes may have been associated with syn-rift uplift preceding the opening of the Palaeo-Tethys Ocean, mantle uplift at the supercontinent margin, or the Eo-Variscan orogenic phase. © 2011 International Association for Gondwana Research.