http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Novel hybrid C/BN two-dimensional heterostructures
Kvashnin, Dmitry G,Kvashnina, Olga P,Avramov, Pavel V,Sorokin, Pavel B,Kvashnin, Alexander G IOP 2017 Nanotechnology Vol.28 No.8
<P>Here we present an investigation of new quasi-two-dimensional heterostructures based on the alternation of bounded carbon and boron nitride layers (C/BN). We carried out a theoretical study of the atomic structure, stability and electronic properties of the proposed heterostructures. Such ultrathin quasi-two-dimensional C/BN films can be synthesized by means of chemically induced phase transition by connection of the layers of multilayered h-BN/graphene van der Waals heterostructures, which is indicated by the negative phase transition pressure in the calculated phase diagrams (<I>P</I>, <I>T</I>) of the films. It was shown that the band gap value of the C/BN films spans the infrared and visible spectrum. We hope that the proposed films and fabrication method can be considered as a possible route to obtain nanostructures with a controllable band gap in wide energy range. This makes these materials potentially suitable for a variety of applications, including photovoltaics, photoelectronics and more.</P>
Nataliya D. Shcherban,Svitlana M. Filonenko,Pavel S. Yaremov,Mykola Skoryk,Vladimir G. Ilyin,Atte Aho,Dmitry Yu. Murzin 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
The samples of nonstoichiometric carbon nitride characterized by spatial ordering, large pore volume(up to 0.8 cm3/g) and specific surface area (up to 585 m2/g) were obtained via matrix carbonization ofethylenediamine in the presence of carbon tetrachloride in mesoporous molecular sieves KIT-6 and MCFas exotemplates. In contrast to nitrogen-containing carbons (obtained by modification of carbon sampleswith nitrogen in the result of compatible thermal treatment of the initial porous carbon with melamine)nonstoichiometric carbon nitride contains much more nitrogen (up to 13.7 wt.% (C/N = 6), comparedwith preceding 0.6 wt.%) and increased the quantity of basic nitrogen-containing groups (in particular,amino groups)—up to 0.68 mmol/g (vs. 0.46 mmol/g). The increase of adsorption capacity towardshydrogen and carbon dioxide: adsorption potential, differential heat of CO2 adsorption, specificadsorption on the pore surface—from 5.4 to 7.3 mmol H2/m2 and from 2.2 to 5.4 mmol CO2/m2 for carbonand synthesized samples of nonstoichiometric carbon nitride, respectively, due to the incorporation ofnitrogen atoms into the carbon framework was noticed.
Pavel Celis,Elisa Vazquez,Cintya G. Soria-Hernández,Diego Bargnani,Ciro A. Rodriguez,Elisabetta Ceretti,Erika García-López 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.5
The use of nanoadditives in lubricants has gained much attention to the research community due to the enhancement of tribological properties and cooling capabilities. This paper studies the advantages of using a MQL (Minimum Quantity of Lubrication) system and nanoadditive in the manufacture of microneedle arrays in Ti6Al4V ELI alloy. Tungsten carbide ball nose tools with a cutting diameter of 200 μm were used in experimental tests. Surface and dimensional characterization was performed to evaluate the impact of a nanoadditive to a vegetable-based oil. Additionally, cutting forces and cutting edge radius (CER) were measured while needles were machined. Experimental tests confirmed that micro end milling with nanoadditives provide slightly better dimensional features and low cutting forces compared to oil. The performance of nanoadditives resulted in a reduction of surface roughness (~ 0.3 μm). Qualitative study of microneedles illustrated burr formation on needle surface manufactured without a nanoadditive solution. Results reveal an increment of CER using low feed rate values (2.0 μm/flute) while a reduction of CER was observed with feed rates up to 2.5 μm/flute. Our results indicated that the addition of nanoadditives to vegetable oil promotes a better product surface topography and cutting tool performance.
Pavel A. Minakir,Artem G. Isaev 한국비교경제학회 2018 비교경제연구 Vol.25 No.2
The article analyzes the main stages in the development of bilateral economic relations between the USSR/Russia and the Democratic People’s Republic of Korea (DPRK) since the 1950s. It is shown how China gradually replaced Russia as the main trade, economic and technological partner of the DPRK. However, despite a significant decrease in trade turnover between Russia and the DPRK in the last 15 years, there are several strategic and economically important tangency points between the two countries. The main current investment projects of cooperation are reflected, as well as projects related to the use of the DPRK’s labor resources, concentrated mainly in the Russian Far East. The characteristic is given of the largest bilateral investment project in transportation infrastructure (Khasan–Rajin Railway). Future cooperation projects are presented that are related to the participation of Russia and both the DPRK and the Republic of Korea. Among them are the projects of connecting the Trans-Siberian and Trans-Korean Railways, as well as energy projects. The possibilities are analyzed of trilateral cooperation (Russia–DPRK–Republic of Korea) within the framework of special economic zones both in the DPRK and in the Far East of Russia. The factors, both positive and negative, affecting the implementation of trilateral cooperation are analyzed.
High-temperature oxidation of europium (II) sulfide
Yuriy G. Denisenko,Maxim S. Molokeev,Alexander S. Krylov,Aleksandr S. Aleksandrovsky,Aleksandr S. Oreshonkov,Victor V. Atuchin,Nikita O. Azarapin,Pavel E. Plyusnin,Elena I. Sal’nikova,Oleg V. Andreev 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
The process of high-temperature oxidation of EuS in the air was explored in the temperature range of500–1000 C. The oxidation reaction enthalpy was determined (DH0exp =1718.5 kJ/mol). The study ofoxidation products allowed to establish the mechanism of EuS oxidation with oxygen. At 500–600 C, EuSis oxidized to a mixture of Eu3+-containing compounds (Eu3S4, Eu2O2S). In the range of 700–1000 C, onlyeuropium oxysulfate Eu2O2SO4 is formed. The structure refinement for Eu2O2SO4 was performed by theRietveld method. The luminescence intensity of europium oxysulfate Eu2O2SO4 with characteristic 4f-4ftransitions from the 5D0 state was investigated as a function of oxidation temperature.
Guzii, Alla G.,Makarieva, Tatyana N.,Denisenko, Vladimir A.,Dmitrenok, Pavel S.,Kuzmich, Aleksandra S.,Dyshlovoy, Sergey A.,von Amsberg, Gunhild,Krasokhin, Vladimir B.,Stonik, Valentin A. American Chemical Society 2016 ORGANIC LETTERS Vol.18 No.14
<P>Melonoside A (<B>1</B>), the first representative of a new class of ω-glycosylated fatty acid amides, was isolated from the Far Eastern marine sponge <I>Melonanchora kobjakovae</I>. The structure of <B>1</B>, including absolute configuration, was established using detailed analysis of 1D and 2D NMR, CD, and mass spectra as well as chemical transformations. Compound <B>1</B> induces autophagy of human cisplatin-resistant germinal tumor cells NCCIT-R.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2016/orlef7.2016.18.issue-14/acs.orglett.6b01678/production/images/medium/ol-2016-01678y_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol6b01678'>ACS Electronic Supporting Info</A></P>
Uncertainties impact on the major FOMs for severe accidents in CANDU 6 nuclear power plant
R.M. Nistor-Vlad,D. Dupleac,G.L. Pavel Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
In the nuclear safety studies, a new trend refers to the evaluation of uncertainties as a mandatory component of best-estimate safety analysis which is a modern and technically consistent approach being known as BEPU (Best Estimate Plus Uncertainty). The major objectives of this study consist in performing a study of uncertainties/sensitivities of the major analysis results for a generic CANDU 6 Nuclear Power Plant during Station Blackout (SBO) progression to understand and characterize the sources of uncertainties and their effects on the key figure-of-merits (FOMs) predictions in severe accidents (SA). The FOMs of interest are hydrogen mass generation and event timings such as the first fuel channel failure time, beginning of the core disassembly time, core collapse time and calandria vessel failure time. The outcomes of the study, will allow an improvement of capabilities and expertise to perform uncertainty and sensitivity analysis with severe accident codes for CANDU 6 Nuclear Power Plant.
Walwyn, Robert J.,Chan, Bun,Usov, Pavel M.,Solomon, Marcello B.,Duyker, Samuel G.,Koo, Jin Young,Kawano, Masaki,Turner, Peter,Kepert, Cameron J.,D'Alessandro, Deanna M. The Royal Society of Chemistry 2018 Journal of materials chemistry. C, Materials for o Vol.6 No.5
<P>This paper reports additional properties of the electron donor molecule triselenathiafulvalene (TSTF) and its synthesis <I>via</I> a new route involving the precursor tetracarbomethoxytriselenathiafulvalene (TCMTSTF). The structural, electronic and computational properties of TSTF are fully profiled, and discussed in the context of the closely related archetypal electron donor molecule tetrathiafulvalene (TTF). TSTF was also incorporated into a charge transfer (CT) complex with the well-known electron acceptor 7,7,8,8-tetracyanoquinodimethane (TCNQ), to generate TSTF-TCNQ. In order to establish its position in the greater TXF-TCNQ series (where TXF = a tetrachalcogenafulvalene), spectral, electrochemical, magnetic, conductivity and computational studies were performed on TSTF and TSTF-TCNQ to extend what is known about the highly interesting and useful new donor molecule.</P>
Giant Magnetoresistance and Field-induced Phase Transitions in Tb7Rh3 Single Crystal
Takanori Tsutaoka,Koji Shimomura,Nikolai V. Baranov,Alexey V. Proshkin,Evgeny G. Gerasimov,Pavel B. Terentev 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
High-field magnetization and magnetoresistance measurements have been performed to investigatethe field-induced magnetic phase transitions in Tb7Rh3 single crystals. Metamagnetic transitionswere observed along the a-, b- and c-axes of the hexagonal crystal lattice in the three magneticstates at temperatures below the N´eel temperature TN = 91 K; magnetic field H - temperatureT phase diagrams were constructed for b- and c- axes. At temperatures below TN, the magneticstructure transformations under application of a magnetic field along the b-axis are observed to beaccompanied by the giant magnetoresistance effect (|Δρ/ρ| up to 65%). Magnetization curves measuredat temperatures above TN show inflection points, which may be indicative of phase transitionswithin regions with an antiferromagnetic short-range order persisting in a paramagnetic matrix.
Makarieva, Tatyana N.,Tabakmaher, Ksenya M.,Guzii, Alla G.,Denisenko, Vladimir A.,Dmitrenok, Pavel S.,Shubina, Larisa K.,Kuzmich, Alexandra S.,Lee, Hyi-Seung,Stonik, Valentin A. American Chemical Society and American Society of 2011 Journal of natural products Vol.74 No.9
<P>New unusual polycyclic guanidine alkaloids monanchocidins B–E (<B>2</B>–<B>5</B>) along with monanchocidin A (<B>1</B>), which we recently described, were isolated from the Far-Eastern marine sponge <I>Monanchora pulchra</I>. Their structures were established using spectroscopic data and chemical transformations. Compounds <B>1</B>–<B>5</B> show potent cytotoxic activities against HL-60 human leukemia cells with IC<SUB>50</SUB> values of 540, 200, 110, 830, and 650 nM, respectively.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jnprdf/2011/jnprdf.2011.74.issue-9/np200452m/production/images/medium/np-2011-00452m_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/np200452m'>ACS Electronic Supporting Info</A></P>