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Optical properties of reduced graphene oxide nanodots prepared by laser ablation
Seliverstova Evgeniya,Ibrayev Niyazbek,Alikhaidarova Elmira,Menshova Evgeniya 한국탄소학회 2022 Carbon Letters Vol.32 No.6
The effect of the laser ablation duration of reduced graphene oxide sheets on their optical properties was studied. After 30 min of ablation, the average lateral size of reduced graphene oxide sheets decreases from 347.4 ± 86.5 nm to 98.8 ± 36.0. The sizes of almost all particles are in the range up to 100 nm, which was confirmed by transmission electron microscopy and dynamic light scattering data. The FTIR spectroscopy data showed that after ablation the intensity of the bands associated with O–H, C–OH and C=O vibrations were noticeably decreased. The optical density and the fluorescence intensity of reduced graphene oxide also depend on the ablation time. After ablation, the reduced graphene oxide fluorescence intensity increased 2–3 times. The fluorescence lifetime decreases both for the first (from 1.36 ns to 0.71 ns) and second (from 6.03 to 3.66 ns) components. A broad band was recorded in the long-lived luminescence spectrum. The long-lived luminescence intensity is higher on 80% for the samples after 30 min of ablation compared to the unablated sample. It was assumed that during laser ablation of reduced graphene oxide a change in the ratio between oxidized and sp2-hybridized carbon occurs. This opens up possibilities for controlling the optical properties of reduced graphene oxide.
Evgeniya D. Rubinshtein 한국로고스경영학회 2009 한국로고스경영학회 학술발표대회논문집 Vol.2009 No.7월
The fishing industry has the leading place in the industry of Russian Far East. During 90th the fishing industry there was in crises stage. However the Far East of Russia has a great potential for the fishing industry development. An investment activity can guaranty the growth, and these investments have to be effective. Therefore, the problem of the distribution of investments becomes crucial, and we are interested in the solution for this problem as a multi-criteria problem, which has to he solved in two-stages. We are to develop the complex of models for the first stage, including optimization models, statistical models and direct computations.
Evgeniya Frantsina,Nataliya Belinskaya,Emiliya Ivanchina 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.2
The dehydrogenation and dewaxing of hydrocarbons of middle-distillate fractions, which proceed in the hydrogen medium, are of great importance in the petrochemical and oil refining industries. They increase oil refining depth and allow producing gasoline, kerosene, and diesel fractions used in the production of hydrocarbon fuels, polymer materials, synthetic detergents, rubbers, etc. Herewith, in the process of dehydrogenation of hydrocarbons of middle distillate fractions (C9-C14) hydrogen is formed in the reactions between hydrocarbons, and the excess of hydrogen slows the target reaction of olefin formation and causes the shift of thermodynamic equilibrium to the initial substances. Meanwhile, in the process of hydrodewaxing of hydrocarbons of middle distillate fractions (C5-C27), conversely, hydrogen is a required reagent in the target reaction of hydrocracking of long-chain paraffins, which ensures required feedstock conversion for production of low-freezing diesel fuels. Therefore, in this study we suggest the approach of intensification of the processes of dehydrogenation and dewaxing of middle distillate fractions by means of redistribution of hydrogen between the two units on the base of the influence of hydrogen on the hydrocarbon transformations using mathematical models. In this study we found that with increasing the temperature from 470 oC to 490 oC and decreasing the hydrogen/feedstock molar ratio in the range of 8.5/1.0 to 6.0/1.0 in the dehydrogenation reactor, the production of olefins increased by 1.45-1.55%wt, which makes it possible to reduce hydrogen consumption by 25,000Nm3/h. Involvement of this additionally available hydrogen in the amount from 10,000 to 50,000Nm3/h in the dewaxing reactor allows increasing the depth of hydrocracking of long-chain paraffins of middle distillate fractions, and, consequently improving low-temperature properties of produced diesel fraction. In such a way cloud temperature and freezing temperature of produced diesel fraction decrease by 1-4 oC and 10-25 oC (at the temperature of 300 oC and 340 oC respectively). However, when the molar ratio hydrogen/hydrocarbons decreases from 8.5/1.0 to 6.0/ 1.0 the yield of side products in the dehydrogenation reactor increases: the yield of diolefins increases by 0.1-0.15%wt, the yield of coke increases by 0.07-0.18%wt depending on the feedstock composition, which is due to decrease in the content of hydrogen, which hydrogenates intermediate products of condensation (the coke of amorphous structure). This effect can be compensated by additional water supply in the dehydrogenation reactor, which oxidizes the intermediate products of condensation, preventing catalyst deactivation by coke. The calculations with the use of the model showed that at the supply of water by increasing portions simultaneously with temperature rise, the content of coke on the catalyst by the end of the production cycle comprises 1.25-1.56%wt depending on the feedstock composition, which is by 0.3-0.6%wt lower that in the regime without water supply.
Evgeniya Potravnaya,김혜진 한국외국어대학교(글로벌캠퍼스) 러시아연구소 2020 REGION Vol.9 No.2
This article substantiates the need for a gender-sensitive approach to research on the economic behavior of inhabitants of the Arctic in the context of the region's industrial development. The article also emphasizes one category of the economic behavior of the indigenous peoples of the North as a separate subject of research in the field of economic sociology. The purpose of the article is the development of a model of economic behavior of the residents of the Arctic in the context of industrial development in the region based on the use of methods of sociological research. The paper presents findings of research carried out in areas of the Russian Arctic where industrialization is underway, as well as the findings of a gender-sensitive survey focused on the impact of the COVID-19 pandemic on the indigenous peoples. The principal characteristics and trends of male and female economic behavior under conditions of industrial development of the Arctic have been defined from a gender-sensitive perspective by means of an example of the Arctic areas of the Sakha Republic (Iakutiia). The article offers gender-sensitive mechanisms for managerial decision making and the elimination of gender inequality in view of findings of sociological surveys in the framework of ethnic expert study and ethnosocial monitoring of the projects, as well as the development of programs of social and economic development of the region with reference to the opinions and preferences of women and men.
Biology of Thymus karatavicus Dm., an endemic plant of the West Tien Shan
Evgeniya Talovskaya,Vera Cheryomushkina,Аlexey Аstashenkov,Аlexandra Guseva,Elmira Naizabekova 국립중앙과학관 2019 Journal of Asia-Pacific Biodiversity Vol.12 No.4
Morphological structure and polyvariation of development of Thymus karatavicus, an endemic of theWest Tien Shan, were studied. Species habitats are monotypic, restricted to Festuca ovina communities ofthe Syrdarya Karatau and Talass Alatau. T. karatavicus was established to be an implicitly polycentricdwarf shrub. An adult plant represents a clump consisting of primary and partial bushes. In morphogenesis,seed individuals pass phases of a primary shoot, a primary bush, and a clump sequentially andvegetative individuals pass phases of a partial bush and a system of partial bushes. The individualontogenesis does not exceed 20 years; over this period, individuals pass 7 ontogenetic states sequentially. Self-preservation of populations is performed by seeds and vegetatively; under changes of growthconditions, the individuals exhibit polyvariation of development. A specific pattern of the morphologicalstructure and development of T. karatavicus determines preservation and sustainable status of its populationsin the West Tien Shan