9 research outputs found
The researches of broomrape acclimatization on white cabbage in the soil-climatic conditions of Central region of the Russian Federation
No full textRelevance. In one of the farms, situated in the Central region of the Russian Federation was found the first defeat of cabbage by obligate weed – broomrape. As the long experience shows (since 2011 yr.), the control of broomrape is very difficult, and it is a real danger for the vegetable growing in this region.Materials and methods. The object of researches were the plantations of white cabbage, which was grown by using the cassette technology, there were field experiments.The research methods included the following works: phenological observations of broomrape and white cabbage ontogenesis, the detection of the main features during blooming and fruiting of this weed, the definition of the duration of broomrape evolution until the fruiting phase, the detection of blooming shoots location on the surface of the cabbage plantation, the identifying of relationship between the height of broomrape’s flower-bearing shoots and the height of leaves of cabbage’s rosette.There was analyzed the feature of growing by using the cassette technology cabbage, being damaged by broomrape.Results. It was found, that the studied in the paper race of broomrape can successfully progress in more northern soil-climatic conditions of the Central region of the Russian Federation. The complex of agro technical methods of broomrape control is suggested, it includes: the two-level plowing of the weedy fields right after harvesting cabbage; receiving of cabbage’s fibrous root, which should be situated into the working plowing space with depth up to 25 cm; multiplex cultivation of the growing shoots of the weed; the cabbage hilling before rows closing. The alternative methods of broomrape control also can be used: the conveyer of cruciferous vegetable cultures with short vegetation period and cultures, which provoke the germination of the weed
Long term UBV RI photometric and spectral monitoring of nova KT Eri during 2009-2023
No full textWe present a status report of our intensive and long-term UBV RI photometric monitoring of nova KT Eri since its outbust in 2009. The old-nova in quiescence is characterized by very high excitation conditions (HeII 4686 being constantly the strongest emission line in optical spectra) and a complex-pattern photometric variability of one mag amplitude in which multi-periodicities (from hours to years) are mixed with chaotic activity of similar amplitude. Mean color and brightness levels are the same for pre- and post- outburst quiescence.4 pages, 4 figures, 1 tabl
EFFICIENCY OF PREVENTION AND MANAGEMENT OF VITAMIN D DEFICIENCY IN YOUNG CHILDREN IN RUSSIA DEPENDING ON THE REGION OF RESIDENCE (BASED ON THE RESULTS OF RODNICHOK-2 STUDY)
No full textMedical examination of 360 children from four regions of Russia (Moscow, Astrakhan, Stavropol, Kazan) showed significant regional differences in the sufficiency and compensation of vitamin D deficiency at the baseline (Day 0) and established factors associated with vitamin D sufficiency on Day 0. The established interregional differences in vitamin D levels were not due to insolation, but primarily to adequate vitamin D supplementation received at the baseline. Vitamin D supplementation (an average of 894 ± 632.6 IU/day) significantly reduced the risk of vitamin D deficiency (RR 0.15, 95% CI 0.09–0.26, P = 5.7 x 10–14). The study included the analysis of factors associated with the increase in 25(OH)D levels during the administration of Aquadetrim, identification of predictors of patient’s response and the analysis of identified predictors. The most important factor determining the patient’s response was the dose of vitamin D taken by the patient: 25(OH)D levels increased by 1 ng/ml with an increase in the dose of vitamin D by 90 IU per day. As can be seen from the above, the study results indicate that the vitamin D deficiency requires a long-term preventive therapy (for at least several months) with adequate doses of vitamin D (1000–2000 IU/day)
Superoutburst of WZSge-type dwarf nova below the period minimum: ASASSN-15po
No full textarXiv:1610.04941v1We report on a superoutburst of a WZ Sge-type dwarf nova (DN), ASASSN-15po. The light curve showed the main superoutburst and multiple rebrightenings. In this outburst, we observed early superhumps and growing (stage A) superhumps with periods of 0.050454(2) and 0.051809(13) d, respectively. We estimated that the mass ratio of secondary to primary (q) is 0.0699(8) by using P and a superhump period PSH of stage A. ASASSN-15po [P ∼ 72.6 min] is the first DN with an orbital period between 67-76 min. Although the theoretical predicted period minimum P of hydrogen-rich cataclysmic variables (CVs) is about 65-70 min, the observational cut-off of the orbital period distribution at 80 min implies that the period minimum is about 82min, and the value is widely accepted. We suggest the following four possibilities: the object is (1) a theoretical period minimum object, (2) a binary with a evolved secondary, (3) a binary with a metal-poor (Popullation II) seconday, or (4) a binary which was born with a brown-dwarf donor below the period minimum.This work was supported by a Grant-in-Aid “Initiative for High- Dimensional Data-Driven Science through Deepening of Sparse Modeling” from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan (25120007). It was also partially supported by grants RFBR No. 15-02-06178, RFBR No. 14-02-0082 (S.S.), VEGA No. 2/0002/13 (S.S.) and RSF No. 14-12-00146 (P.G., for processing observation data from Slovak observatory).Peer Reviewe
Modelamiento químico del metanol como trazador de choques extragalácticos
No full textilustraciones, diagramasThe behavior of methanol (CH3OH) in the composite galaxy NGC 1068 was analyzed to investigate its effectiveness as an extragalactic shock tracer and to study the effect of shock velocity and formation routes on the predicted interstellar abundance of CH3OH. With a parameterized C-shock physical model, C-shock chemistry was investigated with UCLCHEM to study the chemical abundance of CH3OH as a function of time in different locations of the Circumnuclear Disc (CND) near the Active Galactic Nuclei (AGN) and the Starburst (SB) ring of NGC 1068. It is concluded that gas-phase methanol can trace C-type shocks as its abundance increases significantly due to ice-dust grain sputtering or sublimation during shock propagation. This increase in the abundance of gaseous methanol is comparable from both low- (∼10 km/s) and high- (∼50 km/s) velocity shocks. Comparing our models with the multi-line molecular observations and analysis performed by Huang et al. (submitted), we concluded that the observed CH3OH abundance may result from C-shock influence or from thermal sublimation of ice due to protostellar core heating, as both models can account for the observed CH3OH in the gas phase. This work also demonstrated for the first time that the primary reaction leading to the formation of methanol in interstellar ice-dust grains is the radical-molecule H-atom abstraction route under shocked-influenced environments, such as the CND of NGC 1068, from the modeling point of view. This finding is consistent with the results of Simons et al. (2020) and Santos et al. (2022) in dark molecular clouds. However, its dominance is dependent on the gas kinetic temperature (Tk), gas volume density (nH2 ), velocity of the C-shock wave (vshock), and cosmic ray ionisation rate (ζ).Se analizó el comportamiento del metanol (CH3OH) en la galaxia compuesta NGC 1068 para investigar su eficacia como trazador de choques extragalácticos y estudiar el efecto de la velocidad del choque y las rutas de formación sobre la abundancia interestelar prevista de CH3OH. Con un modelo físico parametrizado de choque tipo C, se investigó la química del choque con UCLCHEM para estudiar la abundancia química de CH3OH en función del tiempo en diferentes localizaciones del Disco Circumnuclear (CND) cerca del Núcleo Activo de Galaxia (AGN) y del anillo Starburst (SB) de NGC 1068. Se concluye que el metanol en fase gaseosa puede rastrear choques de tipo C, ya que su abundancia aumenta significati- vamente debido a la pulverización o sublimación de granos helados durante la propagación del choque. Este aumento en la abundancia de metanol gaseoso es comparable para choques de baja (∼10 km/s) y alta velocidad (∼50 km/s). Comparando nuestros modelos con las observaciones moleculares multilíneares y los análisis realizados por Huang et al. (remetido), llegamos a la conclusión de que la abundancia observada de CH3OH puede deberse a la influencia del choque tipo C o a la sublimación térmica del hielo debido al calentamiento del núcleo protoestelar, ya que ambos modelos pueden explicar la abundancia observada de CH3OH en fase gaseosa. Este trabajo también mostró por primera vez que la reacción primaria que conduce a la formación de metanol en los granos de polvo interestelar es la vía de abstracción de átomos de H en entornos influenciados por choques, como el CND de NGC 1068, desde el punto de vista del modelamiento. Este hallazgo concuerda con los re- sultados de Simons et al. (2020) y Santos et al. (2022) en nubes moleculares oscuras. Sin embargo, su predominio depende de la temperatura cinética del gas (Tk), la densidad volumétrica del gas (nH2), la velocidad de la onda de choque (vshock) y la tasa de ionización de rayos cósmicos (ζ). (Texto tomado de la fuente).MaestríaMagíster en Ciencias - AstronomíaAstrochemistry and Active Galactic Nucle
ГЛУБИННОЕ СТРОЕНИЕ ЗЕМНОЙ КОРЫ СЕВЕРО-ВОСТОЧНОЙ ЕВРАЗИИ И ЕЕ КОНТИНЕНТАЛЬНЫХ ОКРАИН
No full textThe paper reports on the deep geophysical studies performed by the Geological Survey of Russia (VSEGEI) under the international project – Deep Processes and Metallogeny of Northern, Central and Eastern Asia. A model of the deep crustal structure is represented by a set of crustal thickness maps and a 5400-km long geotransect across the major tectonic areas of Northeastern Eurasia. An area of 50000000 km2 is digitally mapped in the uniform projection. The maps show the Moho depths, thicknesses of the main crustal units (i.e. the sedimentary cover and the consolidated crust), anomalous gravity and magnetic fields (in a schematic zoning map of the study area), and types of the crust. The geotransect gives the vertical section of the crust and upper mantle at the passive margin of the Eurasian continent (including submarine uplifts and shelf areas of the Arctic Ocean) and the active eastern continental margin, as well as an area of the Pacific plate.В работе представлены результаты обобщения и интерпретации глубинных геофизических исследований, выполненных Геологической службой России (ВСЕГЕИ) в рамках международного проекта «Глубинные процессы и металлогения Северной, Центральной и Восточной Азии». Модель глубинного строения земной коры представлена комплектом карт, отражающих мощностные параметры земной коры, и геотрансектом протяженностью 5400 км, пересекающим основные тектонические области Северо-Восточной Евразии. Комплект цифровых карт, охватывающих область в 50 млн км2, создан в единой проекции и включает карты глубины залегания поверхности Мохоровичича, мощности основных подразделений земной коры (осадочный чехол и консолидированная земная кора), аномального поля силы тяжести и аномального магнитного поля, использованных для районирования территории, а также карту типов земной коры. Геотрансект пересекает северо-восточную часть Евразии и характеризует вертикальный срез земной коры и верхней мантии пассивной окраины Евразийского континента (включая глубоководные поднятия Северного Ледовитого океана и его шельфовую часть), активную восточную континентальную окраину и выходит в область Тихоокеанской плиты
