On the Class II Methanol Maser Periodic Variability due to the Rotating Spiral Shocks in the Gaps of Disks Around Young Binary Stars

We argue that the periodic variability of Class II methanol masers can be explained by variations of the dust temperature in the accretion disk around proto-binary star with at least one massive component. The dust temperature variations are caused by rotation of hot and dense material of the spiral shock wave in the disk central gap. The aim of this work is to show how different can be the Class II methanol maser brightness in the disk during the Moment of Maximum Illumination by the Spiral Shock material (hereafter MMISS) and the Moment when the disk is Illuminated by the Stars Only (MISO). We used the code CLOUDY (v13.02) to estimate physical conditions in the flat disk in the MISO and the MMISS. Model physical parameters of the disk were then used to estimate the brightness of 6.7, 9.9, 12.1 and 107 GHz masers at different impact parameters $p$ using LVG approximation. It was shown that the strong masers experience considerable brightness increase during the MMISS with respect to MISO. There can happen both flares and dips of the 107 GHz maser brightness under the MMISS conditions, depending on the properties of the system. The brightest 9.9 GHz masers in the MMISS are situated at the greater $p$ than the strong 6.7, 12.1 and 107 GHz masers that are situated at $p<200$ AU. The brightness of 9.9 GHz maser in the MMISS suppressed at $p<200$ AU and increase at $p>200$ AU.Comment: Accepted for publication in MNRAS, 9 figure

Properties of dwarf stars in Cygnus OB2

We present the results of investigation of five stars, originally classified as dwarfs, belonging to Cyg OB2 association, their stellar and wind properties. Using both TLUSTY and CMFGEN codes we derived effective temperatures, surface gravities, chemical abundances, mass-loss rates and projected rotation velocities. Due to the fact that distance to the stars is well known, we were able to estimate their luminosities. Using evolutionary models we estimated the ages of these sample stars and find that lower mass ones - MT282 and MT343 - belong to older population of the association. Their ages are greater than 10 Myr. The ages of three other stars - MT317, MT299, MT259 - are between 4-6 Myr.Comment: 16 pages, 10 figures, accepted for publication in PAS

Star formation in the S233 region

The main objective of this paper is to study the possibility of triggered star formation on the border of the HII region S233, which is formed by a B-star. Using high-resolution spectra we determine the spectral class of the ionizing star as B0.5 V and the radial velocity of the star to be -17.5(1.4) km/s. This value is consistent with the velocity of gas in a wide field across the S233 region, suggesting that the ionizing star was formed from a parent cloud belonging to the S233 region. By studying spatial-kinematic structure of the molecular cloud in the S233 region, we detected an isolated clump of gas producing CO emission red-shifted relative to the parent cloud. In the UKIDSS and WISE images, the clump of gas coincides with the infrared source containing a compact object and bright-rimmed structure. The bright-rimmed structure is perpendicular to the direction of the ionizing star. The compact source coincides in position with IRAS source 05351+3549. All these features indicate a possibility of triggering formation of a next-generation star in the S233 region. Within the framework of a theoretical one-dimensional model we conclude that the "collect-and-collapse" process is not likely to take place in the S233 region. The presence of the bright-rimmed structure and the compact infrared source suggest that the "collapse of the pre-existing clump" process is taking place.Comment: 12 pages, 10 figure

On the methanol emission detection in the TW Hya disc: the role of grain surface chemistry and non-LTE excitation

The recent detection of gas-phase methanol (CH$_3$OH) lines in the disc of TW Hya by Walsh et al. provided the first observational constraints on the complex O-bearing organic content in protoplanetary discs. The emission has a ring-like morphology, with a peak at $\sim 30-50$ au and an inferred column density of $\sim 3-6\times10^{12}$ cm$^{-2}$. A low CH$_3$OH fractional abundance of $\sim 0.3-4\times 10^{-11}$ (with respect to H$_2$) is derived, depending on the assumed vertical location of the CH$_3$OH molecular layer. In this study, we use a thermo-chemical model of the TW Hya disc, coupled with the ALCHEMIC gas-grain chemical model, assuming laboratory-motivated, fast diffusivities of the surface molecules to interpret the CH$_3$OH detection. Based on this disc model, we performed radiative transfer calculations with the LIME code and simulations of the observations with the CASA simulator. We found that our model allows to reproduce the observations well. The CH$_3$OH emission in our model appears as a ring with radius of $\sim60$ au. Synthetic and observed line flux densities are equal within the rms noise level of observations. The synthetic CH$_3$OH spectra calculated assuming local thermodynamic equilibrium (LTE) can differ by up to a factor of 3.5 from the non-LTE spectra. For the strongest lines, the differences between LTE and non-LTE flux densities are very small and practically negligible. Variations in the diffusivity of the surface molecules can lead to variations of the CH$_3$OH abundance and, therefore, line flux densities by an order of magnitude.Comment: Accepted for publication in MNRAS, 8 pages, 8 figure

Disorder-driven transition to tubular phase in anisotropic two-dimensional materials

We develop a theory of anomalous elasticity in disordered two-dimensional flexible materials with orthorhombic crystal symmetry. Similar to the clean case, we predict existence of infinitely many flat phases with anisotropic bending rigidity and Young's modulus showing power-law scaling with momentum controlled by a single universal exponent the very same as in the clean isotropic case. With increase of temperature or disorder these flat phases undergo crumpling transition. Remarkably, in contrast to the isotropic materials where crumpling occurs in all spatial directions simultaneously, the anisotropic materials crumple into tubular phase. In distinction to clean case in which crumpling transition happens at unphysically high temperatures, a disorder-induced tubular crumpled phase can exist even at room-temperature conditions. Our results are applied to anisotropic atomic single layers doped by adatoms or disordered by heavy ions bombarding.Comment: 18 LaTex pages, 6 figure

Web environment for publication spatial objects thematic maps

The problem of building a public web-environment for the placement and display of spatial objects on thematic maps. Built ontological scheme of the environment and security model. The choice of development tools and use Yandex.Maps service justified. A prototype of the self-regulatory system creates thematic maps. For owners of the objects (organizations or individuals) are created a means of building thematic maps and publishing them industrial, social or personal facility. Interested Internet users does search objects on the characteristics and does get location on a scalable electronic map.Рассматривается задача построения общедоступной веб-среды для размещения и отображения пространственных объектов на тематических картах. Построена онтологическая схема среды и модель защиты данных. Обоснован выбор средств разработки и использование сервиса Яндекс.Карты. Разработан прототип общедоступной саморегулируемой системы. Для владельцев объектов (организаций или физических лиц) предоставлены средства создания тематических карт и публикации на них производственных, социальных или личных объектов. Заинтересованным пользователям Интернет предоставлен поиск объектов по характеристикам и отображение их местонахождения на масштабируемой электронной карте

Towards detecting methanol emission in low-mass protoplanetary discs with ALMA:The role of non-LTE excitation

The understanding of organic content of protoplanetary discs is one of the main goals of the planet formation studies. As an attempt to guide the observational searches for weak lines of complex species in discs, we modelled the (sub-)millimetre spectrum of gaseous methanol (CH$_3$OH), one of the simplest organic molecules, in the representative T Tauri system. We used 1+1D disc physical model coupled to the gas-grain ALCHEMIC chemical model with and without 2D-turbulent mixing. The computed CH$_3$OH abundances along with the CH$_3$OH scheme of energy levels of ground and excited torsional states were used to produce model spectra obtained with the non-local thermodynamic equilibrium (non-LTE) 3D line radiative transfer code LIME. We found that the modelled non-LTE intensities of the CH$_3$OH lines can be lower by factor of $>10$--$100$ than those calculated under assumption of LTE. Though population inversion occurs in the model calculations for many (sub-)millimetre transitions, it does not lead to the strong maser amplification and noticeably high line intensities. We identify the strongest CH$_3$OH (sub-)millimetre lines that could be searched for with the Atacama Large Millimeter Array (ALMA) in nearby discs. The two best candidates are the CH$_{3}$OH $5_0-4_0~A^+$ (241.791 GHz) and $5_{-1}-4_{-1}~E$ (241.767 GHz) lines, which could possibly be detected with the $\sim5\sigma$ signal-to-noise ratio after $\sim3$ hours of integration with the full ALMA array.Comment: Accepted for publication in MNRAS, 15 figures, 3 table

ОТДАЛЕННЫЕ РЕЗУЛЬТАТЫ МУЛЬТИОРГАННЫХ ОПЕРАЦИЙ ПРИ МЕСТНОРАСПРОСТРАНЕННОМ КОЛОРЕКТАЛЬНОМ РАКЕ

This article is devoted to studying the  long-term results  of  multiorgan procedures in treatment of colorectal cancer. We reviewed our experience with 25 patients who underwent surgical   treatment  about  locally  advanced  colorectal   cancer   considering   previously developed theory  of  tumor  penetration. The reliability of  this  theory  was  confirmed. In comparison of two groups  of patients with local and locally advanced colorectal  cancer the results are similar.Статья посвящена изучению  отдаленных результатов мультиорганных операций при  местнораспространенном раке  толстой  кишки.  Прослежены результаты хирургического  лечения  25  больных   местно-распространенным колоректальным раком, оперированных с учетом ранее  разработанной теории  опухолевой пенетрации. Подтверждена состоятельность предложенной теории опухолевой пенетрации. При сравнении  результатов лечения  групп пациентов, страдающих локализованной формой рака толстой кишки и местно-распространенной, получены статистически  сопоставимые результаты.

Treatment for low back pain, use of meloxicam

To manage patients with low back pain is an urgent problem of modern medicine. The paper considers the main causes of chronic nonspecific lumbago and the principles of its diagnosis and treatment in the context of evidence-based medicine. Medical treatment using analgesics (nonsteroidal anti-inflammatory drugs (NSAIDs), weak opioids), antidepressants, therapeutic exercises, and cognitive-behavioral therapy as components of a multidisciplinary treatment is noted to be highly effective. The efficacy and side effects of NSAIDs, the high efficiency and safety of using meloxicam in different dosage forms are outlined.The authors set forth their experience in treating 85 patients with chronic low back pain and an observation of a female patient who has concurrent chronic migraine and abuses analgesics