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“Lomonosov” Satellite—Space Observatory to Study Extreme Phenomena in Space
Sadovnichii, V. A.,Panasyuk, M. I.,Amelyushkin, A. M.,Bogomolov, V. V.,Benghin, V. V.,Garipov, G. K.,Kalegaev, V. V.,Klimov, P. A.,Khrenov, B. A.,Petrov, V. L. Springer Science + Business Media 2017 Space science reviews Vol.212 No.3
<P>This paper is directed towards the general description of both scientific goals of the project and scientific equipment on board the satellite. The following papers of this issue are devoted to detailed descriptions of scientific instruments.</P>
The TUS Detector of Extreme Energy Cosmic Rays on Board the Lomonosov Satellite
Klimov, P. A.,Panasyuk, M. I.,Khrenov, B. A.,Garipov, G. K.,Kalmykov, N. N.,Petrov, V. L.,Sharakin, S. A.,Shirokov, A. V.,Yashin, I. V.,Zotov, M. Y.,Biktemerova, S. V.,Grinyuk, A. A.,Grebenyuk, V. M. Springer-Verlag 2017 Space science reviews Vol.212 No.3
<P>It will also be able to register slower atmospheric transient events: atmospheric fluorescence in electrical discharges of various types including precipitating electrons escaping the magnetosphere and from the radiation of meteors passing through the atmosphere. We describe the design of the TUS detector and present results of different ground-based tests and simulations.</P>
Prospects of Nanoscience with Nanocrystals
Kovalenko, Maksym V.,Manna, Liberato,Cabot, Andreu,Hens, Zeger,Talapin, Dmitri V.,Kagan, Cherie R.,Klimov, Victor I.,Rogach, Andrey L.,Reiss, Peter,Milliron, Delia J.,Guyot-Sionnnest, Philippe,Konstan American Chemical Society 2015 ACS NANO Vol.9 No.2
<P>Colloidal nanocrystals (NCs, <I>i.e.</I>, crystalline nanoparticles) have become an important class of materials with great potential for applications ranging from medicine to electronic and optoelectronic devices. Today’s strong research focus on NCs has been prompted by the tremendous progress in their synthesis. Impressively narrow size distributions of just a few percent, rational shape-engineering, compositional modulation, electronic doping, and tailored surface chemistries are now feasible for a broad range of inorganic compounds. The performance of inorganic NC-based photovoltaic and light-emitting devices has become competitive to other state-of-the-art materials. Semiconductor NCs hold unique promise for near- and mid-infrared technologies, where very few semiconductor materials are available. On a purely fundamental side, new insights into NC growth, chemical transformations, and self-organization can be gained from rapidly progressing <I>in situ</I> characterization and direct imaging techniques. New phenomena are constantly being discovered in the photophysics of NCs and in the electronic properties of NC solids. In this Nano Focus, we review the state of the art in research on colloidal NCs focusing on the most recent works published in the last 2 years.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-2/nn506223h/production/images/medium/nn-2014-06223h_0020.gif'></P>
Advances of Isomerizing-hydrogenating Properties of CoMo Catalysts Supported on ASA-Al2O3
E. A. Avdeenko,K. A. Nadeina, T. V. Larina,V. P. Pakharukova,E. Yu. Gerasimov,I. P. Prosvirin,A. A. Gabrienko,Yu. V. Vatutina,O. V. Klimov,A. S. Noskov 대한화학회 2022 대한화학회지 Vol.66 No.5
Because hydrotreating (HDT) of FCC gasoline is one of the important processes used to prepare such gasoline for blending, the development of a catalyst for this process is of great interest. Currently, the industrial HDT of FCC gasoline consists of two stages and the creation of a new catalyst for one-stage HDT will make this process more efficient. Recently, our group has developed the CoMo/Al2O3-ASA catalyst and studied the influence of Si/Al ratio on the target reactions of HDT process. Despite the high selectivity and activity, the catalyst with ASA is not applicable in industry because of its low strength. The present work moves forward to study the influence of the ASA content in the catalyst support and clarify the possibility to develop the catalyst that combines high activity and selectivity in HDT reactions with successful performance. Here we show that the CoMo catalyst with ASA/Al2O3 molar ratio 1/1 in the support is the best combination for FCC gasoline hydrotreatment due to exceptional properties of the catalyst composition.
Pinchetti, Valerio,Shornikova, Elena V.,Qiang, Gang,Bae, Wan Ki,Meinardi, Francesco,Crooker, Scott A.,Yakovlev, Dmitri R.,Bayer, Manfred,Klimov, Victor I.,Brovelli, Sergio American Chemical Society 2019 NANO LETTERS Vol.19 No.12
<P>Colloidal CdSe nanocrystals (NCs) overcoated with an ultrathick CdS shell, also known as dot-in-bulk (DiB) structures, can support two types of excitons, one of which is core-localized and the other, shell-localized. In the case of weak “sub-single-exciton” pumping, emission alternates between the core- and shell-related channels, which leads to two-color light. This property makes these structures uniquely suited for a variety of photonic applications as well as ideal model systems for realizing complex excitonic quasi-particles that do not occur in conventional core/shell NCs. Here, we show that the DiB design can enable an unusual regime in which the same long-lived resident electron can endow trionlike characteristics to either of the two excitons of the DiB NC (core- or shell-based). These two spectrally distinct trion states are apparent in the measured photoluminescence (PL) and spin dynamics of core and shell excitons conducted over a wide range of temperatures and applied magnetic fields. Low-temperature PL measurements indicate that core- and shell-based trions are characterized by a nearly ideal (∼100%) emission quantum yield, suggesting the strong suppression of Auger recombination for both types of excitations. Polarization-resolved PL experiments in magnetic fields of up to 60 T reveal that the core- and the shell-localized trions exhibit remarkably similar spin dynamics, which in both cases are controlled by spin-flip processes involving a heavy hole.</P> [FIG OMISSION]</BR>
Hydrogen photoproduction by use of photosynthetic organisms and biomimetic systems
Allakhverdiev, Suleyman I.,Kreslavski, Vladimir D.,Thavasi, Velmurugan,Zharmukhamedov, Sergei K.,Klimov, Vyacheslav V.,Nagata, Toshi,Nishiharad, Hiroshi,Ramakrishna, Seeram Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.2
Hydrogen can be important clean fuel for future. Among different technologies for hydrogen production, oxygenic natural and artificial photosyntheses using direct photochemistry in synthetic complexes have a great potential to produce hydrogen, since both use clean and cheap sources: water and solar energy. Artificial photosynthesis is one way to produce hydrogen from water using sunlight by employing biomimetic complexes. However, splitting of water into protons and oxygen is energetically demanding and chemically difficult. In oxygenic photosynthetic microorganisms such as algae and cyanobacteria, water is split into electrons and protons, which during primary photosynthetic process are redirected by photosynthetic electron transport chain, and ferredoxin, to the hydrogen-producing enzymes hydrogenase or nitrogenase. By these enzymes, $e^-$ and $H^+$ recombine and form gaseous hydrogen. Biohydrogen activity of hydrogenase can be very high but it is extremely sensitive to photosynthetic $O_2$. In contrast, nitrogenase is insensitive to $O_2$, but has lower activity. At the moment, the efficiency of biohydrogen production is low. However, theoretical expectations suggest that the rates of photon conversion efficiency for $H_2$ bioproduction can be high enough (>10%). Our review examines the main pathways of $H_2$ photoproduction by using of photosynthetic organisms and biomimetic photosynthetic systems.
Kurashov, Vasily N.,Allakhverdiev, Suleyman I.,Zharmukhamedov, Sergey K.,Nagata, Toshi,Klimov, Vyacheslav V.,Semenov, Alexey Yu.,Mamedov, Mahir D. Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.2
An electrometric technique was used to investigate the generation of a photovoltage ($\Delta\psi$) by Mn-depleted spinach photosystem II (PS II) core particles incorporated into liposomes. In the presence of $MnCl_2$, the fast kinetically unresolvable phase of $\Delta\psi$ generation, related to electron transfer between the redox-active tyrosine $Y_Z$ and the primary plastoquinone acceptor $Q_A$ was followed by an additional electrogenic phase (${\tau}\;{\sim}\;20\;{\mu}s$, ~5% of the phase attributed to ${Y_Z}^{OX}{Q_A}^-$). The latter phase was ascribed to the transfer of an electron from the Mn, bound to the Mn-binding site of the PS II reaction center to the ${Y_Z}^{OX}$. An additional electrogenicity observed upon addition of synthetic trinuclear Mn complex-1 has a ${\tau}\;{\sim}\;50\;{\mu}s$ (~4% of the ${Y_Z}^{OX}Q_A$) and ${\tau}\;{\sim}\;160\;ms$ (~25%). The fast electrogenic component could be ascribed to reduction of ${Y_Z}^{OX}$ ox by Mn, delivered to the Mn-binding site in Mn-depleted samples after the release of the tripod ligands from the complex-1 while the slow electrogenic phase to the electron transfer from theMn-containing complex-1 attached to the protein-water boundary to the oxidized Mn at the protein-embedded Mn-binding site.
CCQM-K90, formaldehyde in nitrogen, 2 μmol mol<sup>−1</sup> Final report
Viallon, le,Flores, Edgar,Idrees, Faraz,Moussay, Philippe,Wielgosz, Robert Ian,Kim, D,Kim, Y D,Lee, S,Persijn, S,Konopelko, L A,Kustikov, Y A,Malginov, A V,Chubchenko, I K,Klimov, A Y,Efremova, O V,Zh BUREAU INTERNATIONAL DES POIDS ET MESURES 2017 METROLOGIA -BERLIN- Vol.54 No.1