202 research outputs found
Cool spots on the surface of the active giant PZ Mon
Based on the multiband (BVRIJHKL) photometric observations of the active red
giant PZ Mon performed for the first time in the winter season of 2017-2018, we
have determined the main characteristics of the spotted stellar surface in a
parametric three-spot model. The unspotted surface temperature is Teff=4730 K,
the temperature of the cool spots is Tspot=3500 K, their relative area is about
41%, and the temperature of the warm spots is Twarm=4500 K with a maximum
relative area up to 20%. The distribution of spots over the stellar surface has
been modeled. The warm spots have been found to be distributed at various
longitudes in the hemisphere on the side of the secondary component and are
most likely a result of its influence.Comment: 5 pages, 7 figure
Improving the X-ray resolution by reversible flash-cooling combined with concentration screening, as exemplified with PPase
Time based radar signal analysis revealing nature and properties of surface scans
To clarify subsurface properties, it is necessary to investigate the time base of the signal. However, it is often necessary to solve the problem of determining the structure of only the surface layer. Our method addresses this problem. Advantages of the method: 1. Highlights homogeneous areas in terms of surface conditions 2. It can process large data on profile measurements in an almost continuous mode, using any one (or a small amount) information signal attribute. 3. There is no need for desk data processing, interpretation. 4. This method uses a signal of any nature. Here we explore if it is possible to obtain more information about the quality and state of the object by not only looking at a single time-based measurement, but instead looking at consecutive measurements as from a stream. By studying the structure of the stream and the changes in it, properties like moisture content can be revealed. A method is proposed for fingerprinting radar signals and detecting the boundaries of homogeneous media during a scan along changing objects properties
Особенности профессиональной мобильности выпускников вуза на рынке труда в условиях инновационного образования
The article is dedicated to consideration of particularities of shaping a creatively developed personality of a student, as well as to shaping new principles of preparation of a modern specialist. The article is based on results of interviews carried out in May-July 2008-2010 in the context of the project «Developing new educational programs and vocational training of personnel in the field of nanotechnology and nanosystems on the basis of competency approach and integration processes» Special attention is paid to the key directions of professional orientation of high school students, professional formation conforming to the requirements of the modern economy, understanding of needs of the labour market, as well as acquisition of universal knowledge and practical skills required in order to successfully work and to be needed in the labour market.Cтатья посвящена рассмотрению особенностей формирования творчески развитой личности студента, а также разработки вопросов по формированию инновационных принципов подготовки современных специалистов. В основу статьи легли результаты социологического опроса, проведенного с участием авторов в 2008-2010 гг. в рамках проекта «Разработка новых образовательных программ и содержания профессиональной подготовки элитных кадров в области нанотехнологий и наносистем на основе компетентностного подхода и интеграционных процессов». Особое значение придается ключевым направлениям профессиональной ориентации студентов вуза, профессиональному становлению, адекватному требованиям современной экономики, пониманию потребностей рынка труда, а также приобретению универсальных знаний и практических навыков, необходимых для успешной работы и востребованности на рынке труда
ПРЕВРАЩЕНИЕ КОРОТКОЦЕПНЫХ н-АЛКАНОВ ПОД ДЕЙСТВИЕМ ГИДРОДИНАМИЧЕСКОЙ КАВИТАЦИИ
The structure and properties of oil disperse systems (ODS) are mainly determined by the presence of paraffin hydrocarbons (n-alkanes) in the crude oil and natural gas liquid. Short-chain n-alkanes (С8-С17) are part of ODS dispersion medium. Under oil refining treatment, they concentrate in the distillate fractions and influence the operation characteristics of product liquid fuels and natural gas liquid.We studied the influence of hydrodynamic cavitation on the short-chain n-alkanes. Cavitation was produced by a high pressure disintegrator DA-1. A plunger pump produced compression pressure 50 MPa. Cavitation treatment was applied three times in a row. The research object was liquid oil paraffin containing 96.5% wt. n-alkanes С9-С21 (including 95% wt. С9-С17) and 2.5% wt. isoalkanes С10-С20; the balance was a mixture of other hydrocarbons. The results of GLC demonstrated that the total conversion of initial n-alkanes С14-С17 was not high, but it grew growing constantly: after the 1st cavitation cycle - 1.4%, after the 2nd cavitation cycle - 2.7%, after the 3rd one - 3.6%. At the highest conversion, the concentration of n-alkanes C8-C13 in liquid oil paraffin increased by 28% rel., and the concentration of n-alkanes C18-C22 - by 36% rel. The information obtained allows predicting the influence of the short-chain n-alkanes present in the oil feed on alterations of its hydrocarbon and fraction composition after cavitation.Наличие в нефтяном и газоконденсатном сырье углеводородов парафинового ряда (н-алканов) во многом определяет структуру и свойства нефтяных дисперсных систем (НДС). Короткоцепные н-алканы (С8-С17) входят в состав дисперсионной среды НДС. При переработке нефти они концентрируются в дистиллятных фракциях и влияют на эксплуатационные характеристики товарных моторных топлив. В работе исследовали влияние гидродинамической кавитации на короткоцепные н-алканы Источником кавитации служил дезинтегратор высокого давления ДА-1. Давление сжатия, создаваемое плунжерным насосом в ДА-1, составляло 50 МПа, кавитационное воздействие осуществляли последовательно три раза. Объект исследования - нефтяной жидкий парафин, содержащий 96.5% масс. н-алканов С9-С21 (в том числе 88.2% масс. С14-С17) и 2.5% масс. изоалканов С10-С20, остальное - примеси углеводородов других классов. Результаты ГЖХ показали, что суммарная конверсия исходных н-алканов С14-С17 не велика, но устойчиво возрастала: после первого цикла кавитации она составила 1.4%, после второго - 2.7%, после третьего - 3.6%. При наибольшей конверсии содержание н-алканов С8-С13 в нефтяном жидком парафине увеличилось на 1.9% масс. (28% отн.), н-алканов С18-С22 - на 0.6% масс. (36% отн.). Полученная информация позволит прогнозировать, каким образом наличие в нефтяном и газоконденсатном сырье короткоцепных н-алканов скажется на изменении его углеводородного и фракционного состава после кавитации
OT J002656.6+284933 (CSS101212:002657+284933): An SU UMa-type dwarf nova with the longest superhump period
© The Author 2017. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved. For Permissions, please email:. We observed the 2016 outburst of OT J002656.6+284933 (CSS101212:002657+284933) and found that it has the longest recorded [0.13225(1) d on average] superhumps among SU UMa-type dwarf novae. The object is the third known SU UMa-type dwarf nova above the period gap. The outburst, however, was unlike ordinary long-period SU UMa-type dwarf novae in that it s howed two post-outburst rebrightenings. It showed superhump evolution similar to short-period SU UMa-type dwarf novae. We could constrain the mass ratio to less than 0.15 (most likely between 0.10 and 0.15) by using superhump periods in the early and post-superoutburst stages. These results suggest the possibility that OT J002656.6+284933 has an anomalously undermassive secondary and it should have followed a different evolutionary track from the standard one
Превращение алканов под действием единичного импульса гидродинамической кавитации. II. Поведение Среднецепных алканов С21-С38
Transformation of medium-chain alkanes in the disintegrator DA-1 under treatment of single impulse of hydrodynamic cavitation has been studied. Cavitation appears when hydrocarbons pass through the micro-gap with controlled cross-section under high pressure. 5% solution of solid paraffin (alkanes C21–C38) in n-dodecane and two oil samples were used as objects of research. The first sample is partially stripped bituminous oil from Khosedauskoe field of Republic of Komi with paraffin content 0.5%wt. The second sample is mixture of above mentioned oil and paraffin with total concentration of the latter in this oil sample 6.5 %wtРассмотрены превращения среднецепных алканов в дезинтеграторе ДА-1 под действием единичного импульса гидродинамической кавитации. Кавитация возникала при течении углеводородов под влиянием высокого давления через микрощель с регулируемым сечением. В качестве объектов исследования использовали 5%-ный раствор твердого парафина (алканы С21-С38) в н-додекане, а также два образца нефти. Первый - частично отбензиненная битуминозная нефть Хоседаюского месторождения Республики Коми с содержанием парафина 0.5% мас. Второй являлся смесью упомянутой нефти и парафина с суммарной концентрацией последнего в этом образце нефти 6.5% мас
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