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IR-transparent MgO-Gd_(2)O_(3) composite ceramics produced by self-propagating high-temperature synthesis and spark plasma sintering

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Journal of Advanced Ceramics 2021年第2期10卷 237-246页

作者： Dmitry A.Permin Maksim S.Boldin Alexander V.Belyaev Stanislav S.Balabanov Vitaly A.Koshkin Atrem A.Murashov Igor V.Ladenkov evgeny A.Lantsev ksenia e.smetanina Nadia M.Khamaletdinova G.G.Devyatykh institute of chemistry of high-purity substances of the ras nizhny novgorod603137russia Lobachevsky state university of nizhny novgorod nizhny novgorod603950russia “Joint-stock company”research and production enterprise“salut” nizhny novgorod603950russia G.A.Razuvaev institute of organometallic chemistry of the ras nizhny novgorod603137russia

A glycine–nitrate self-propagating high-temperature synthesis(SHS)was developed to produce composite MgO-Gd_(2)O_(3) *** X-ray powder diffraction(XRD)analysis confirmed the SHS-product consists of cubic MgO and Gd_(2)O_(3) phases with nanometer crystallite size and retains this structure after annealing at temperatures up to 1200℃.Near full dense high IR-transparent composite ceramics were fabricated by spark plasma sintering(SPS)at 1140℃and 60 *** in-line transmittance of 1 mm thick MgO-Gd_(2)O_(3) ceramics exceeded 70%in the range of 4–5 mm and reached a maximum of 77%at a wavelength of 5.3 *** measured microhardness HV0.5 of the MgO-Gd2O3 ceramics is 9.5±0.4 GPa,while the fracture toughness(KIC)amounted to 2.0±0.5МPa·m1/*** characteristics demonstrate that obtained composite MgO-Gd_(2)O_(3) ceramic is a promising material for protective infra-red(IR)windows.

关键词： MgO-Gd_(2)O_(3) self-propagating high-temperature synthesis(SHS) spark plasma sintering(SPS) optical properties infra-red(IR)ceramics

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Will Russia become a blueprint for emerging nations’hightech reforms?evidence from a 26-countries dataset

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International Journal of Innovation Studies 2023年第4期7卷 312-324页

作者： elena G.Popkova Aleksei V.Bogoviz ksenia V.ekimova Bruno S.Sergi RUDN University MoscowRussia Independent Researcher MoscowRussia Department of Financial Management Plekhanov Russian University of EconomicsMoscowRussian Federation University of Messina Italy

The central question of this study concerns the emergence of the Russian development model over the past *** highlights that this development model could be a blueprint for other emerging *** is one of the leaders of the Fourth Industrial Revolution,having improved its standing in international ratings for quality of life,human development,sustainable development,innovation,and high ***'s experience can be helpful to developing *** study and evaluate innovation in a digital business society amid technological turmoil competing with artificial *** focus on the digital competitiveness index,the density of robots in industry,and unemployment,thereby building a novel comprehensive dataset of the economy's systemic socioeconomic and technological development under the conditions of the Fourth Industrial *** draw attention to Russia's new business environment that exhibits valuable specifics(e.g.,emerging institutions and imperfect competition as clouds in the business landscape)shaped by its current transitional *** estimate that technological progress will ensure digitalization,the prevention of extended unemployment,and the achievement of full-scale ***'s innovation policy has substantial advantages for emerging market *** study also shows that institutionalizing the new approach provides enduring digital economy advantages for emerging markets,including effectiveness,progressiveness,and sustainability.

关键词： New business paradigms Innovation Digital modernization Industry 4.0 Smart technologies Russia emerging markets Sustainability Unfolding new social innovations New digital era

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Spontaneous Twist and Intrinsic Instabilities of Pristine Graphene Nanoribbons

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Nano Research 2009年第2期2卷 161-166页

作者： ksenia V.Bets Boris I.Yakobson Department of Mechanical engineering&Materials Science Department of Chemistryand The Richard E.Smalley Institute for Nanoscale Science and TechnologyRice UniversityHoustonTexas 77005USA

In pristine graphene ribbons,disruption of the aromatic bond network results in depopulation of covalent orbitals and tends to elongate the edge,with an effective force of fe~2 eV/Å(larger for armchair edges than for zigzag edges,according to calculations).This force can have quite striking macroscopic manifestations in the case of narrow ribbons,as it favors their spontaneous twisting,resulting in the parallel edges forming a double helix,resembling DNA,with a pitchλt of about 1520 lattice *** atomistic simulations,we investigate how the torsionτ~1/λt decreases with the width of the ribbon,and observe its bifurcation:the twist of wider ribbons abruptly vanishes and instead the corrugation localizes near the *** length-scale(λe)of the emerging sinusoidal“frill”at the edge is fully determined by the intrinsic parameters of graphene,namely its bending stiffness D=1.5 eV and the edge force fe withλe~D/*** reveals other warping configurations and suggests their sensitivity to the chemical passivation of the edges,leading to possible applications in sensors.

关键词： Graphene nanoribbons mechanics twist

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Quantitative tracking of trans-synaptic nose-to-brain transport of nanoparticles and its modulation by odor,aging,and Parkinson’s disease

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Nano Research 2023年第5期16卷 7119-7133页

作者： Alexander V.Romashchenko Dmitrii V.Petrovskii Sergey Yu.Trotsky ksenia N.Morozova Nina B.Illarionova Maria V.Zhukova elena V.Kiseleva Marina B.Sharapova Daniil S.Zuev Konstantin e.Kuper Sergey Yu.Taskaev Anna I.Kasatova Dmitrii A.Kasatov Olga I.Solovieva Ivan A.Razumov Ludmila A.Gerlinskaya Mikhail P.Moshkin Yuri M.Moshkin The Federal Research Center Institute of Cytology and Genetics SB RASAcademician Lavrentiev Avenue10Novosibirsk 630090Russia International tomography center Institutskaya st.3ANovosibirsk 630090Russia G.K.Boreskov Institute of Catalysis SB RASAcademician Lavrentiev Avenue5Novosibirsk 630090Russia The Federal Research Center Budker Institute of Nuclear Physics SB RASAcademician Lavrentiev Avenue11Novosibirsk 630090Russia Institute of Computational Technologies Academician M.A.Lavrentiev avenue6Novosibirsk 630090Russia Institute of Gene Biology Russian Academy of SciencesMoscow 117334Russia Institute of Molecular and Cellular Biology SB RASAcad.Lavrentiev Ave8/2Novosibirsk 630090Russia Federal Research Centre of Biological Systems and Agrotechnologies RASst.January 929Orenburg 460000Russia

Nanoparticles(NPs)can be transported via the nose-to-brain(N_(2)B)***,quantitative data on their spatiotemporal dynamics and regulation of the N_(2)B transport are largely *** surveyed metal oxide/hydroxide NPs as magnetic resonance imaging(MRI)contrasts for quantitative N_(2)B *** containing divalent transition metals were the only ones capable of N_(2)B *** T1-weighted(T1W)MRI,we showed that Mn_(3)O_(4)-NPs were readily engulfed by olfactory receptor neurons(ORNs)without disrupting olfactory sensing,we mapped their N_(2)B *** neurons,the Mn_(3)O_(4)-NPs were localized to the cytosol,mitochondria,vesicles,moved at mixed fast and slow axonal transport velocities intraand extra-vesicularly through *** NPs’axonal transport is dependent on neuronal activity and microtubule *** Mn_(3)O_(4)-NPs were trans-synaptically transmitted through at least four synapses across the olfactory ***-synaptic transmission of the NPs was dependent on N-type Ca^(2+)channels and NMDA receptors but blocked by GABAB receptor activation.A five-parameter Weibull signal increase/decrease model fitted to the T1W MRI data allowed for estimating kinetic parameters of Mn_(3)O_(4)-NP accumulation/*** and relative accumulation rates,but not elimination,correlated negatively with the number of synapses from ORNs,indicating a coupling of the NPs’N_(2)B transport with spontaneous neuronal ***,olfactory stimuli(2,5-dimethylpyrazine and acetophenone)significantly modulated and rerouted the Mn_(3)O_(4)-NP N_(2)B transport odor ***,the NPs’trans-synaptic transmission was impaired by aging and the onset of Parkinson’s *** data suggest new approaches to diagnostics,functional neuroimaging,controlling N_(2)B drug delivery.

关键词： Mn_(3)O_(4)nanoparticles magnetic resonance imaging(MRI) nose-to-brain transport trans-synaptic transmission olfactory stimulation

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Perovskite-transition metal dichalcogenides heterostructures: recent advances and future perspectives

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Opto-electronic Science 2022年第8期1卷 1-40页

作者： Ahmed elbanna ksenia Chaykun Yulia Lekina Yuanda Liu Benny Febriansyah Shuzhou Li Jisheng Pan Ze Xiang Shen Jinghua Teng Institute of Materials Research and engineering Agency for ScienceTechnology and Research(A*STAR)2 Fusionopolis WaySingapore 138634Singapore Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological University50 Nanyang AvenueSingapore 637371Singapore Interdisciplinary Graduate Program Energy Research Institute@NTUNanyang Technological University50 Nanyang AvenueSingapore 639798Singapore The Photonics Institute and Center for Disruptive Photonic Technologies Nanyang Technological University50 Nanyang AvenueSingapore 639798 Singapore School of Materials Science and engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Berkeley educational Alliance for Research in Singapore(BeARS) Ltd.1 CREATE WaySingapore 138602Singapore.

Transition metal dichalcogenides(TMDs)and perovskites are among the most attractive and widely investigated semiconductors in the recent *** are promising materials for various applications,such as photodetection,solar energy harvesting,light emission,and many *** these materials to form heterostructures can enrich the already fascinating properties and bring up new phenomena and *** in this field is growing rapidly in both fundamental studies and device ***,we review the recent findings in the perovskite-TMD heterostructures and give our perspectives on the future development of this promising *** fundamental properties of the perovskites,TMDs,and their heterostructures are discussed first,followed by a summary of the synthesis methods of the perovskites and TMDs and the approaches to obtain high-quality *** attention is paid to the TMD-perovskite heterostructures that have been applied in solar cells and photodetectors with notable performance *** through our analysis,we propose an outline on further fundamental studies and the promising applications of perovskite-TMD heterostructures.

关键词： transition metal dichalcogenides perovskites heterostructures photodetectors solar cells 2D materials

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基于信息维数碳纳米管薄膜中碳纳米管分布均匀性评价方法

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沈阳航空航天大学学报 2014年第3期31卷 49-52页

作者：聂鹏高明圳曾宪君 ksenia lakovleva 沈阳航空航天大学机电工程学院沈阳110136

以分形理论为基础,以信息维数为测度对碳纳米管薄膜中的碳纳米管分散均匀性进行评价,运用MATLAB软件对碳纳米管薄膜SeM图像进行二值化,图像叠加,直线拟合等处理,求出直线的斜率,其斜率的绝对值即信息维数DI,将DI作为评定碳纳米管分布均... 详细信息

以分形理论为基础,以信息维数为测度对碳纳米管薄膜中的碳纳米管分散均匀性进行评价,运用MATLAB软件对碳纳米管薄膜SeM图像进行二值化,图像叠加,直线拟合等处理,求出直线的斜率,其斜率的绝对值即信息维数DI,将DI作为评定碳纳米管分布均匀性参数,其值越接近于2,其分布越均匀。将该理论应用于不同工艺下生产的碳纳米管薄膜,证明其可行性。

关键词：碳纳米管薄膜信息维数分布均匀性

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