В. А. Надточенко, Nikolai N. Denisov, Igor V. Rubtsov, A. S. Lobach, A. P. Moravskiǐ,
The quenching of triplet-excited 3C60 by electron acceptors TCNQ and TCNE has been established in nonpolar toluene and moderately polar benzonitrile solutions. The quenching constants kq are 5.5 × 109 in toluene, 2.2 × 109 in benzonitrile for TCNQ and 7.9 × 105 in toluene, 4.2 × 108 (M s)−1 in benzonitrile for TCNE. The 3C60 quenching can be explained by triplet exciplex formation. The time-resolved spectra of the C60/TCNE system exhibit a well pronounced charge-transfer excited state [Cδ60 … TCNEδ−] in benzonitrile.
Tópico(s): Polymer Nanocomposite Synthesis and Irradiation
1993 - Elsevier BV | Chemical Physics Letters
В. А. Надточенко, I. V. Vasil'Ev, N. N. Denisov, Igor V. Rubtsov, A. S. Lobach, A. P. Moravskiǐ, A. F. Shestakov,
The picosecond transient absorption spectrum of C60 in toluene was obtained in the region 420-1100 nm and a new transient absorption band near 1000 nm was discovered. This band was attributed to the S1—Sx transition, probably between configurations (hu)9(t1g)1 ← (hu)9(t1u)1. The intersystem crossing time τ= 830±190 ps was estimated from the S1—Sx absorption decay and from the creation of the T1-Tx absorption band.
Tópico(s): Carbon Nanotubes in Composites
1993 - Elsevier BV | Journal of Photochemistry and Photobiology A Chemistry
Емил Велинов, Milan Malý, Yelena Petrenko, Igor V. Denisov, Vasko Vassilev,
This paper aims to investigate the relationship between the existence of firm digitalization and firm internationalization in selected companies in the European Union (EU). The study provides evidence that upper echelon characteristics bring new competences and skills, including digital skills, which are essential for company internationalization in the modern world of turmoil, crisis and uncertainty. The research paper argues that top management team (TMT) characteristics, and particularly digitalization ...
Tópico(s): Economic and Business Development Strategies
2020 - Multidisciplinary Digital Publishing Institute | Sustainability
Емил Велинов, Yelena Petrenko, Elena Vechkinzova, Igor V. Denisov, Luis Ochoa Sigüencia, Zofia Gródek-Szostak,
This paper aims to determine and explain the main factors for power losses (the so-called “leaky bucket” effect) in Kazakhstan and the reasons for inefficient energy distribution within the country. Energy efficiency in Kazakhstan is much lower compared to more economically developed countries. The differences between energy efficiency in various regions of Kazakhstan are also significant. This article explores the impact of administrative monopoly tariffs on the regional energy efficiency, based ...
Tópico(s): Energy, Environment, and Transportation Policies
2020 - Multidisciplinary Digital Publishing Institute | Energies
Igor A. Denisov, Н. А. Скопцов, Maxim Gaponenko, A. M. Malyarevich, K. V. Yumashev, A. A. Lipovskiĭ,
Passive Q-switched mode locking of a 2.09 microm flashlamp-pumped Cr(3+),Tm(3+),Ho(3+):Y(3)Sc(2)Al(3)O(12) laser by use of a phosphate glass doped with PbS quantum dots of 5 nm in radius was demonstrated. Mode-locked pulses of 290 ps in duration and up to 0.5 mJ in energy were registered.
Tópico(s): Photorefractive and Nonlinear Optics
2009 - Optica Publishing Group | Optics Letters
Yuri V. Volk, Igor A. Denisov, A. M. Malyarevich, K. V. Yumashev, О. С. Дымшиц, A. V. Shashkin, А. А. Жилин, Ук Канг, Kyeong-Hee Lee,
Q switching of a diode-pumped Nd3+:KGd(WO4)2 laser at 1.35 microm by use of cobalt-doped magnesium- and zinc-aluminosilicate glass ceramics as saturable absorbers is demonstrated. Q-switching efficiency up to 40% has been obtained. Ground-state absorption cross sections for Co2+ ions at the wavelengths of 1.35 and 1.54 microm are estimated to be (3.5-4.0) x 10(-19) cm2. Bleaching relaxation times under the excitation of the 4A2 --> 4T1(4F) transition of tetrahedrally coordinated Co2+ ions are of 280 +/- ...
Tópico(s): Photonic Crystal and Fiber Optics
2004 - Optica Publishing Group | Applied Optics
A. M. Malyarevich, Igor A. Denisov, K. V. Yumashev, О. С. Дымшиц, А. А. Жилин, Ук Канг,
A new saturable absorber Q switch for 1.54-mum Er:glass lasers is presented. The saturable absorber is a transparent glass ceramic that contains magnesium-aluminum spinel nanocrystallites doped with tetrahedrally coordinated Co(2+) ions. We obtained Q-switched pulses of up to 5.5 mJ in energy and 80 ns in duration at 1.54 mum. The relaxation time of (4)A(2) ?(4)T(1)((4)F) transition bleaching was measured to be (450 ? 150) ns. Ground-state and excited-state absorption cross sections at 1.54-mum wavelength ...
Tópico(s): Laser-Matter Interactions and Applications
2001 - Optica Publishing Group | Applied Optics
A. M. Malyarevich, Igor A. Denisov, V.G. Savitsky, K. V. Yumashev, A. A. Lipovskiĭ,
By using a PbS-doped phosphate glass as an intracavity saturable absorber, we achieved passive Q switching of a 1.54-µm Er:Yb:glass laser. We obtained Q-switched pulses with 110-ns duration and 0.2-mJ energy. The saturation intensity at 1.54 µm was estimated to be ∼60 kW/cm2.
Tópico(s): Laser-Matter Interactions and Applications
2000 - Optica Publishing Group | Applied Optics
Igor V. Denisov, Yelena Petrenko, Irina Aleksandrovna Koretskaya, Stanislav Benčič,
The COVID-19 pandemic, which began in February 2020, has radically changed the processes related to higher education. The main purpose of our study is to help scholar communities distinguish between educational approaches that seek to sustain the “unsustainable” and to identify the problems of lecturer–student interaction in the midst of the mass transition to distance learning and to find ways to solve them. The results of our research show that the transition to distance education during the pandemic ...
Tópico(s): COVID-19 and Mental Health
2021 - Multidisciplinary Digital Publishing Institute | Sustainability
Емил Велинов, Vasko Vassilev, Igor V. Denisov,
The paper aims to examine the development of modern innovative management methods and practices such as Holacracy, Obliquity, Adhocracy and Sociocracy, which are novelty in the Management science and practice. The study illustrates contingency approaches in designing, managing and developing agile companies from wide varieties of industries. The paper sheds light on contemporary methods in organizing, planning and setting goals of companies in a post-knowledge era. It is like an operating system ...
Tópico(s): Economic and Technological Innovation
2018 - Business Perspectives | Problems and Perspectives in Management
В. А. Надточенко, N. N. Denisov, Igor V. Rubtsov, A. S. Lobach, A. P. Moravsky,
Tópico(s): Advanced Chemical Physics Studies
1993 - Springer Science+Business Media | Russian Chemical Bulletin
Н.Д. Кенжебеков, Yerlan Zhailauov, Емил Велинов, Yelena Petrenko, Igor V. Denisov,
The paper sheds a light on the interconnections between touristic sector development and regional development in Kazakhstan. The paper covers analysis of the current competitiveness of the touristic destinations in Kazakhstan. Based on qualitative and quantitative research, the study shows that there is a huge need for a transformation in marketing communications tools in order to increase the competitiveness and image of Kazakhstani tourism. The study provides potential scenarios and solutions ...
Tópico(s): Global Healthcare and Medical Tourism
2021 - Multidisciplinary Digital Publishing Institute | Information
... in Organic Chemistry and Biology. Von Evgeny T. Denisov und Igor B. Afanas'ev. Gian Franco Pedulli, Gian Franco ...
Tópico(s): Chemistry and Chemical Engineering
2006 - Wiley | Angewandte Chemie
... in Organic Chemistry and Biochemistry. By Evgeny T. Denisov and Igor B. Afanas'ev. Gianfranco Pedulli, Gianfranco Pedulli Dipt. ...
Tópico(s): Various Chemistry Research Topics
2006 - Wiley | Angewandte Chemie International Edition
Alexander Denisov, Roman Iakovlev, Igor Lebedev,
Robots are used to solve routine, monotonous, difficult and dangerous tasks; therefore, agriculture is one of the largest spheres for using robotic systems. One of the main problems faced by developers of autonomous robotic systems is the navigation of the robot in space. This paper presents a solution to the problem of navigation, based on the maintenance of a constant radio signal between the UAV or mobile platform and control system. Radio communication is maintained by building a mesh network ...
Tópico(s): IoT-based Smart Home Systems
2019 - Springer Science+Business Media | Lecture notes in computer science
Objective - This paper explores how global corporations apply contemporary approaches in management known as holacracy, and its impact on company performance. The paper argues that the number of corporations with an incorporated model of holacracy is growing and that it leads to an increase of employee's creativity and engagement, which directly affect a companies' performance. Furthermore, the study sheds light on broadening the theoretical link between holacratic management models and company performance ...
Tópico(s): Corporate Management and Leadership
2017 - Global Academy of Training & Research | GATR Global Journal of Business Social Sciences Review
Yelena Petrenko, Igor V. Denisov, Gaukhar Koshebayeva, V. V. Biryukov,
The problems of efficient use of energy costs have been actively explored in recent decades in connection with rising energy prices. During this period, the main models for assessing energy efficiency and energy management were developed, including the models Total Quality Management, Six Sigma and Sustainable Value Stream Mapping. The aim of the research was to study the energy efficiency of the production and services in Kazakhstan based on materials of the large-scale national study on the estimation ...
Tópico(s): Environmental Impact and Sustainability
2020 - Multidisciplinary Digital Publishing Institute | Energies
N. G. Mavlyanova, Igor V. Denisov, В. А. Липатов,
Numbers of regional natural disasters have arisen over recent decades, which can be directly attributed to the impact of unconstrained, economic development on or by the geological fabric of Central Asia. Central Asia covers the territories of Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan and Uzbekistan. Before the political breakup of the former Soviet Union, all these countries were administered centrally. After the disintegration of the USSR, when the five republics became independent, each ...
Tópico(s): Global Energy Security and Policy
2014 - Springer Nature (Netherlands) | NATO science for peace and security series. C, Environmental security
Yelena Petrenko, Igor V. Denisov, Oleg Metsik,
Changes in modern technologies have led to a decrease in the role of oil and threaten the well-being of oil-exporting countries. The oil and gas industry is the leading one in the economy of Kazakhstan, and the future of the country depends on its development. The purpose of the presented research is to determine the long-term image of the future oil and gas industry and develop a strategy for the government and national companies in different spheres for actions in conditions of increasing uncertainty. ...
Tópico(s): Global Energy and Sustainability Research
2022 - Multidisciplinary Digital Publishing Institute | Energies
L. M. Shkadov, V.Ye. Denisov, V. V. Lazarev, Igor V. Plokhikh, V. I. Buzuluk, Sergei Volodin, K. A. Chervonenko, V. V. Skipenko,
Consideration is given to fully reusable winged two- and single-stage systems powered by hydrogen/oxygen rocket engines, which differ in types of takeoff [horizontal takeoff (HTO) using an undercarriage; ground sled-assisted takeoff; air launch from a subsonic carrier; and launching-pad vertical takeoff (VTO)]. The systems have been optimized and compared using two criteria: payload mass and “dry mass to payload mass” ratio. The influence of the gross weight of a system and the technological level on ...
Tópico(s): Space Exploration and Technology
1995 - Elsevier BV | Acta Astronautica
Elizaveta K. Melnikova, Dmitry Yu. Aleshin, Igor A. Nikovskiy, Gleb L. Denisov, Yulia V. Nelyubina,
A series of three different solvatomorphs of a new iron(II) complex with N,N′-disubstituted 2,6-bis(pyrazol-3-yl)pyridine, including those with the same lattice solvent, has been identified by X-ray diffraction under the same crystallization conditions with the metal ion trapped in the different spin states. A thermally induced switching between them, however, occurs in a solution, as unambiguously confirmed by the Evans technique and an analysis of paramagnetic chemical shifts, both based on variable- ...
Tópico(s): Metal-Catalyzed Oxygenation Mechanisms
2020 - Multidisciplinary Digital Publishing Institute | Crystals
Vasili G. Savitski, Igor A. Denisov, A. M. Malyarevich, K. V. Yumashev, A. V. Sandulenko,
Use of a V(3+):Y(3)Al(5)O(12) crystal as a saturable absorber Q-switch for 1.07 and 1.35 microm Nd:KGd(WO(4))(2) diode pumped lasers shows a considerable dependence of output characteristics on the orientation of the intracavity field polarization vector regarding V(3+):Y(3)Al(5)O(12) crystallographic axes. Anisotropy of nonlinear absorption of V(3+) ions in a Y(3)Al(5)O(12) single crystal at wavelengths of 1.08 and 1.35 microm has been experimentally studied. The experimental data are analyzed ...
Tópico(s): Photorefractive and Nonlinear Optics
2007 - Optica Publishing Group | Applied Optics
Igor A. Denisov, K. V. Yumashev, R. Moncorgé, B Ferrand,
Passive Q switching of a diode-pumped Nd(3+):KGd(WO(4))(2) laser is demonstrated by use of Cr(4+):SrGd(4)(SiO(4))(3)O and Cr(4+):CaGd(4)(SiO(4))(3)O crystals as saturable absorbers. An average output power of 40 mW was obtained with a pulse repetition rate of ~0.4 MHz.
Tópico(s): Advanced Fiber Laser Technologies
2001 - Optica Publishing Group | Applied Optics
Roman Corobov, Igor Sîrodoev, Sonja Koeppel, Nickolai Denisov, Ghennadi Sîrodoev,
Vulnerability to climate change of the Moldavian part of the Dniester river was assessed as the function of exposure, sensitivity, and adaptive capacity of its basin’s natural and socioeconomic systems. As a spatial “scale” of the assessment, Moldova’s administrative‐territorial units (ATUs) were selected. The exposure assessment was based on the climatic analysis of baseline (1971–2000) temperature and precipitation and projections of their changes in 2021–2050, separately for cold and warm periods. ...
Tópico(s): Climate change impacts on agriculture
2013 - Hindawi Publishing Corporation | The Scientific World JOURNAL
Nikita Denisov, Shanshan Qin, Johannes Will, Bojana Nedić Vasiljević, Natalia V. Skorodumova, Igor A. Pašti, Bidyut Bikash Sarma, Benedict Osuagwu, Tadahiro Yokosawa, Johannes Voß, Janis Wirth, Erdmann Spiecker, Patrik Schmuki,
With recent advances in the field of single-atoms (SAs) used in photocatalysis, an unprecedented performance of atomically dispersed co-catalysts has been achieved. However, the stability and agglomeration of SA co-catalysts on the semiconductor surface may represent a critical issue in potential applications. Here, the photoinduced destabilization of Pt SAs on the benchmark photocatalyst, TiO2 , is described. In aqueous solutions within illumination timescales ranging from few minutes to several hours, ...
Tópico(s): Electrocatalysts for Energy Conversion
2022 - | Advanced Materials
Igor Yusipov, T. V. Laptyeva, S. Denisov, Mikhail Ivanchenko,
In an isolated single-particle quantum system a spatial disorder can induce Anderson localization. Being a result of interference, this phenomenon is expected to be fragile in the face of dissipation. Here we show that dissipation can drive a disordered system into a steady state with tunable localization properties. This can be achieved with a set of identical dissipative operators, each one acting non-trivially only on a pair of neighboring sites. Operators are parametrized by a uniform phase, ...
Tópico(s): Quantum and electron transport phenomena
2017 - American Physical Society | Physical Review Letters
Wojciech Tarnowski, Igor Yusipov, T. V. Laptyeva, S. Denisov, Dariusz Chruściński, Karol Życzkowski,
Continuous-time Markovian evolution appears to be manifestly different in classical and quantum worlds. We consider ensembles of random generators of $N$-dimensional Markovian evolution, quantum and classical ones, and evaluate their universal spectral properties. We then show how the two types of generators can be related by superdecoherence. In analogy with the mechanism of decoherence, which transforms a quantum state into a classical one, superdecoherence can be used to transform a Lindblad operator ( ...
Tópico(s): Quantum Information and Cryptography
2021 - American Physical Society | Physical review. E
В. М. Лисицын, Е. Ф. Полисадова, Л. А. Лисицына, А. Т. Тулегенова, Igor A. Denisov, M.G. Golkovski,
The study is devoted to investigating the efficiency dependence of radiation-assisted ceramic synthesis based on metal oxides and fluorides on initial powder particle sizes. The synthesis was performed for 30 series of ceramic samples, including MgO, Al2O3, ZnO, ZrO2, MgF2, and complex compositions: cerium-activated yttrium-aluminum garnet (Y3Al5O12), spinel AlMgO4, and tungstate MgWO4. The synthesis efficiency was evaluated on the mixture weight magnitude losses, morphology, and relative weight ...
Tópico(s): Glass properties and applications
2023 - Multidisciplinary Digital Publishing Institute | Photonics
Igor Yusipov, Olga Vershinina, S. Denisov, С. П. Кузнецов, Mikhail Ivanchenko,
Quantum systems interacting with their environments can exhibit complex non-equilibrium states that are tempting to be interpreted as quantum analogs of chaotic attractors. Yet, despite many attempts, the toolbox for quantifying dissipative quantum chaos remains very limited. In particular, quantum generalizations of Lyapunov exponent, the main quantifier of classical chaos, are established only within the framework of continuous measurements. We propose an alternative generalization which is based ...
Tópico(s): stochastic dynamics and bifurcation
2019 - American Institute of Physics | Chaos An Interdisciplinary Journal of Nonlinear Science
I. Vakulchyk, Igor Yusipov, Mikhail Ivanchenko, Sergej Flach, S. Denisov,
Many-body localization (MBL) is a result of the balance between interference-based Anderson localization and many-body interactions in an ultra-high dimensional Fock space. It is usually expected that dissipation is blurring interference and destroying that balance so that the asymptotic state of a system with an MBL Hamiltonian does not bear localization signatures. We demonstrate, within the framework of the Lindblad formalism, that the system can be brought into a steady state with non-vanishing ...
Tópico(s): Model Reduction and Neural Networks
2018 - American Physical Society | Physical review. B./Physical review. B