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Polyelectrolyte Complexes between Hyperbranched and Linear Polysaccharides: Fucoidan/Chitosan

Chinese Journal of Polymer Science 2024年第4期42卷 468-479页

作者： Ekaterina R.Gasilova daria n.Poshina Aleksandra O.Sitnikova natalia n.Saprykina Yury A.Skorik Institute of Macromolecular Compounds of the Russian Academy of Sciences Bolshoi VO 31St.Petersburg199004Russian Federation

Polyelectrolyte complexes(PECs)of hyperbranched(HB)and linear polysaccharides are promising as more effective encapsulation agents compared to PECs formed by linear *** investigated the PECs between the HB anionic polysaccharide fucoidan(FUC)and the cationic linear polysaccharide chitosan(CS).The FUC had a molecular weight(MW)of 30×*** PECs were prepared in three solvents(water,0.01 and 0.1 mol/L acetic acid)with CS of MW of 15,110 and 170 kDa,and deacetylation degrees(DDA)of 70%and 97%.The structures of the PECs and the initial FUC were investigated by multi-angle static and dynamic light *** the FUC contained 18 wt%of—OSO3 groups and 5 wt%of uronic acid units,it was a“strong-weak”copolyanion,so the HB macromolecules of the FUC formed nanogel particles in 0.1 mol/L AcOH and open branched structures in water,as confirmed by the Kratky *** mixing the solutions of original components,the PEC structures underwent an equilibration period,the duration of which increased with the MW of *** the charge stoichiometry was approached,the PECs shrank;the fractal dimension approached unity,indicating the side-by-side packing of adjacent FUC branches with the help of *** aggregation in the vicinity of the charge compensation was hardly observed,as it occurred in a very narrow *** PEC content at theζ-potential inversion depended on solvents’pH and the DDA of *** the extreme case of core-shell PECs in 0.1 mol/L AcOH,obtained by mixing FUC nanogels with the solutions of high MW CS of 97%DDA,the protruding tails of CS formed a positively charged shell in the whole range of FUC content(10 wt%nning electron microscopy and atomic force microscopy images of dried samples were discussed in relation to the light scattering results.

关键词： Polyelectrolyte complexes Chitosan Hyperbranched fucoidan Light scattering

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In-situ study of the microstructure evolution during tension of a Mg-Y-Zn-Al alloy processed by rapidly solidified ribbon consolidation technique

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Journal of Magnesium and Alloys 2024年第5期12卷 2024-2040页

作者： Jeno Gubicza Kristián Máthis Péter nagy Péter Jenei Zoltán Hegedus Andrea Farkas Jozef Vesely Shin-ichi Inoue daria Drozdenko Yoshihito Kawamura Department of Materials Physics Faculty of ScienceEotvos Loránd UniversityPázmány P.sétány 1/ABudapest H-1117Hungary Department of Physics of Materials Faculty of Mathematics and PhysicsCharles UniversityKe Karlovu 512116 Praha 2Czech Republic Deutsches Elektronen-Synchrotron DESY Notkestr.85Hamburg 22603Germany Magnesium Research Center Kumamoto University2-39-1 KurokamiChuo-kuKumamoto 860-8555Japan

Mg-Y-Zn-Al alloys processed by rapidly solidified ribbon consolidation(RSRC)technique exhibit an exceptional mechanical performance indicating promising application *** material has a bimodal microstructure consisting of fine recrystallized and coarse non-recrystallized grains with solute-rich stacking faults forming cluster arranged layers(CALs)and nanoplates(CAnaPs),or complete long period stacking ordered(LPSO)*** order to reveal the deformation mechanisms,in-situ synchrotron X-ray diffraction line profile analysis was employed for a detailed study of the dislocation arrangement created during tension in Mg-0.9%Zn-2.05%Y-0.15%Al(at%)*** uncovering the effect of the initial microstructure on the mechanical performance,additional samples were obtained by annealing of the as-consolidated specimen at 300 and 400℃ for 2 *** heat treatment at 300℃ had no significant effect on the initial microstructure,its evolution during tension and,thus,the overall deformation behavior under tensile *** the other hand,annealing at 400℃ resulted in a significant increase of the recrystallized grains fraction and a decrease of the dislocation density,leading to only minor degradation of the mechanical *** maximum dislocation density at the failure of the samples corresponding to the plastic strain of 10-25% was estimated to be about 16-20×10^(14)m^(-2).The diffraction profile analysis indicated that most dislocations formed during tension were of non-basal and pyramidal types,what was also in agreement with the Schmid factor values revealed independently from orientation *** was also shown that the dislocation-induced Taylor hardening was much lower below the plastic strain of 3% than above this value,which was explained by a model of the interaction between prismatic dislocations and CAnaPs/LPSO plates.

关键词： Mg-Zn-Y-Al alloy Long period stacking ordered(LPSO)phase Cluster arranged nanoplates(CAnaPs) Annealing Tension Dislocation density Hardening

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Polariton lasing in Mie-resonant perovskite nanocavity

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Opto-Electronic Advances 2024年第4期7卷 27-42页

作者： Mikhail A.Masharin daria Khmelevskaia Valeriy I.Kondratiev daria I.Markina Anton D.Utyushev Dmitriy M.Dolgintsev Alexey D.Dmitriev Vanik A.Shahnazaryan Anatoly P.Pushkarev Furkan Isik Ivan V.Iorsh Ivan A.Shelykh Hilmi V.Demir Anton K.Samusev Sergey V.Makarov UnAM-Institute of Materials Science and nanotechnology National Nanotechnology Research CenterDepartment of Electrical and Electronics EngineeringDepartment of PhysicsBilkent UniversityAnkara 06800Turkey ITMO University School of Physics and EngineeringSt.Petersburg 197101Russia Abrikosov Center for Theoretical Physics MIPTDolgoprudnyiMoscow Region 141701Russia LUMInOUS!Center of Excellence for Semiconductor Lighting and Displays School of Electrical and Electronic EngineeringSchool of Physical and Mathematical SciencesSchool of Materials Science and EngineeringNanyang Technological UniversitySingapore 639798Singapore Department of Physics Engineering Physics and AstronomyQueen’s UniversityKingstonOntario K7L 3N6Canada Science Institute University of IcelandDunhagi 3IS-107ReykjavikIceland Experimentelle Physik 2 Technische Universität DortmundDortmund 44227Germany Qingdao Innovation and Development Center Harbin Engineering UniversityQingdao 266000China

Deeply subwavelength lasers(or nanolasers)are highly demanded for compact on-chip bioimaging and sensing at the *** of the main obstacles for the development of single-particle nanolasers with all three dimensions shorter than the emitting wavelength in the visible range is the high lasing thresholds and the resulting *** we ex-ploit exciton-polariton condensation and mirror-image Mie modes in a cuboid CsPbBr3 nanoparticle to achieve coherent emission at the visible wavelength of around 0.53μm from its ultra-small(≈0.007μm3 or≈λ3/20)semiconductor *** polaritonic nature of the emission from the nanocavity localized in all three dimensions is proven by direct com-parison with corresponding one-dimensional and two-dimensional waveguiding systems with similar material *** a deeply subwavelength nanolaser is enabled not only by the high values for exciton binding energy(≈35 meV),re-fractive index(>2.5 at low temperature),and luminescence quantum yield of CsPbBr3,but also by the optimization of po-laritons condensation on the Mie resonances with quality factors improved by the metallic ***,the key parameters for optimal lasing conditions are intermode free spectral range and phonons spectrum in CsPbBr3,which govern polaritons condensation *** chemically synthesized colloidal CsPbBr3 nanolasers can be potentially de-posited on arbitrary surfaces,which makes them a versatile tool for integration with various on-chip systems.

关键词： nanolaser perovskite polariton Mie resonance exciton-polariton

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Root structure syndromes of four families of monocots in the Middle Urals

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Plant Diversity 2023年第6期45卷 722-731页

作者： Anna A.Betekhtina daria E.Tukova Denis V.Veselkin Ural Federal University named After the First President of Russia B.n.Yeltsin 19 Mira StreetEkaterinburg 620002Russia Ural Branch of the Russian Academy of Sciences Institute of Plant and Animal Ecology8 Marta StreetEkaterinburg 620144Russia

The present article tests the following general assumption:plant taxa with different specializations towards mycorrhizal interactions should have different root *** of 61 species common in boreal zone were studied:16 species of Poaceae,24 species of Cyperaceae,14 species of Orchidaceae,and 7 species of *** a fixed material of 5 individuals of each species,the following was determined:number of orders of branching roots;transverse dimensions of root,stele and cortex;number of primary xylem vessels and exodermis layers;length of root hairs;abundance of *** of each family had well-defined *** of Orchidaceae and Iridaceae were thick with a large stele and developed *** had no branching roots and had long root *** Iridaceae,roots were branched,and root hairs were *** of Poaceae and Cyperaceae were thin with a relatively thin *** hairs were short in Poaceae and long in *** finding that root syndromes of four families of monocots differed is a new and unexpected *** high specificity of root syndromes in Cyperaceae,Iridaceae,Poaceae,and Orchidaceae indicates that species of these families use different strategies to obtain water and soil nutrients.

关键词： Monocots Poaceae Cyperaceae Orchidaceae Iridaceae Syndromes of roots structure

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Third-harmonic generation and imaging with resonant Si membrane metasurface

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光电进展(英文) 2023年第8期6卷 18-27页

作者： Ze Zheng Lei Xu Lujun Huang daria Smirnova Khosro Zangeneh Kamali Arman Yousefi Fu Deng Rocio Camacho-Morales Cuifeng Ying Andrey E.Miroshnichenko Dragomir n.neshev Mohsen Rahmani Advanced Optics and Photonics Laboratory Department of EngineeringSchool of Science&TechnologyNottingham Trent UniversityNottingham NG118NSUK School of Engineering and Information Technology University of New South WalesCanberra ACT 2600Australia School of Physics and Electronic Science East China Normal UniversityShanghai 200241China ARC Centre of Excellence for Transformative Meta-Optical Systems(TMOS) Research School of PhysicsAustralian National UniversityCanberra ACT 2601Australia Department of Physics Hong Kong University of Science and TechnologyKowloonHong Kong SAR 999077China

Dielectric metasurfaces play an increasingly important role in enhancing optical nonlinear generations owing to their ability to support strong light-matter interactions based on Mie-type multipolar *** to metasurfaces composed of the periodic arrangement of nanoparticles,inverse,so-called,membrane metasurfaces offer unique possibilities for supporting multipolar resonances,while maintaining small unit cell size,large mode volume and high field enhancement for enhancing nonlinear frequency ***,we theoretically and experimentally investigate the formation of bound states in the continuum(BICs)from silicon dimer-hole membrane *** demonstrate that our BIC-formed resonance features a strong and tailorable electric near-field confinement inside the silicon membrane ***,we show that by tuning the gap between the holes,one can open a leaky channel to transform these regular BICs into quasi-BICs,which can be excited directly under normal plane wave *** prove the capabilities of such metasurfaces,we demonstrate the conversion of an infrared image to the visible range,based on the Third-harmonic generation(THG)process with the resonant membrane *** results suggest a new paradigm for realising efficient nonlinear photonics metadevices and hold promise for extending the applications of nonlinear structuring surfaces to new types of all-optical near-infrared imaging technologies.

关键词： nonlinear imaging third-harmonic generation bound states in the continuum membrane metasurfaces

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A detailed reconstruction of changes in the factors and parameters of soil erosion over the past 250 years in the forest zone of European Russia(Moscow region)

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International Soil and Water Conservation Research 2022年第1期10卷 149-160页

作者： Andrey Zhidkin daria Fomicheva nadezhda Ivanova Tomas Dostal Alla Yurova Mikhail Komissarov Josef Krasa V.V.dokuchaev soil science institute pyzhevskiy pereulok 7moscow119017russian federation Faculty of geography lomonosov moscow state universityleninskie gorygsp-1moscow119991russian federation Department of landscape water conservation faculty of civil engineeringczech technical university in praguethakurova 7prague16629czech republic Ufa institute of biology ufrc russian academy of sciencespr.oktyabrya 69ufa450054russian federation

Accelerated soil erosion is a major threat to soil,and there are great variations in the rate of soil erosion over time due to natural and human-induced *** temperate forest zone of Russia is character-ized by complex stages of land-use history(*** urbanization,agricultural development,land abandonment,etc.).We have for the first time estimated the rates of soil erosion by the WaTEM/SEDEM model(rainfall erosion)and by a regional model(snowmelt erosion)over the past 250 years(from 1780 to 2019)for a 100-km2 study site in the Moscow region of *** calculations were made on the basis of a detailed historical reconstruction of the following factors:the location of the arable land,crop rotation,the rain erosivity factor,and the maximum snow water *** area of arable land has decreased more than 3.5-fold over the past 250 *** the end of the 20th century,the rates of gross erosion had declined more than 5.5-fold(from 28×10^(3) to 5×10^(3) t·ha^(-1)yr^(-1))in comparison with the end of the 18th *** in the boundaries of arable land and also the relief features had led to a significant intra-slope accumulation of *** a result of sediment redeposition within the arable land,the variation in net soil erosion was significantly lower than the variation in gross soil *** changes in arable land area and in crop composition are the factors that have to the greatest extent determined the changes in soil erosion in this territory.

关键词： Anthropogenic soil erosion Soil erosion history Crop rotation Magnetic tracer method WaTEM/SEDEM

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Integral Cayley Graphs over Finite Groups

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Algebra Colloquium 2020年第1期27卷 131-136页

作者： Elena VKonstantinova daria Lytkinat Sobolev Institute of Mathematics Ak.Koptyug av.4Novosibirsk 630090Russia novosibirsk State University Pirogovastr.2Novosibirsk 630090Russia Siberian State University of Telecommunications and Information Sciences Kirova str.86 Novosibirsk 630108Russia novosibirsk State University Pirogova str.2Novosibirsk 630090Russia

We prove that the spectrum of a Cayley graph over a finite group with a normal generating set S containing with every its element s all generators of the cyclic group(s)is *** particular,a Cayley graph of a 2-group generated by a normal set of involutions is *** prove that a Cayley graph over the symmetric group of degree n no less than 2 generated by all transpositions is *** find the spectrum of a Cayley graph over the alternating group of degree n no less than 4 with a generating set of 3-cycles of the form(k i j)with fixed k,a s{-n+1,1-n+1,2^2-n+1,...,(n-1)2-n+1}.

关键词： Cayley graph symmetric group alternating group group algebra Star graph

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Ultrasmall CoS nanoparticles embedded in heteroatom-doped carbon for sodium-ion batteries and mechanism explorations via synchrotron X-ray techniques

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Journal of Energy Chemistry 2023年第4期79卷 373-381页

作者： Congcong Liu Qiongqiong Lu Mikhail V.Gorbunov Ahmad Omar Ignacio G.Gonzalez Martinez Panpan Zhao Martin Hantusch Antonius Dimas Chandra Permana Huanyu He nikolai Gaponik daria Mikhailova Leibniz Institute for Solid State and Materials Research(IFW)Dresden e.V. Helmholtzstraße 2001069 DresdenGermany Inorganic Chemistry II Technische Universität DresdenBergstraße 6601069 DresdenGermany Physical Chemistry Technische Universität DresdenZellescher Weg 1901069 DresdenGermany

Transition metal sulfides have been regarded as promising anode materials for sodium-ion batteries(SIB).However,they face the challenges of poor electronic conductivity and large volume change,which result in capacity fade and low rate *** this work,a composite containing ultrasmall CoS(~7 nm)nanoparticles embedded in heteroatom(n,S,and O)-doped carbon was synthesized by an efficient one-step sulfidation process using a Co(Salen)*** ultrasmall CoS nanoparticles are beneficial for mechanical stability and shortening na-ions diffusion ***,the n,S,and O-doped defect-rich carbon provides a robust and highly conductive framework enriched with active sites for sodium storage as well as mitigates volume expansion and polysulfide *** anode for SIB,CoS@HDC exhibits a high initial capacity of 906 mA h g^(-1)at 100 mA g^(-1)and a stable long-term cycling life with over 1000 cycles at 500 mA g^(-1),showing a reversible capacity of 330 mA h g^(-1).Meanwhile,the CoS@HDC anode is proven to maintain its structural integrity and compositional reversibility during ***,na-ion full batteries based on the CoS@HDC anode and na_(3)V_(2)(PO_(4))_(3)cathode demonstrate a stable cycling behavior with a reversible specific capacity of~200 m A h g^(-1)at least for 100 ***,advanced synchrotron operando X-ray diffraction,ex-situ X-ray absorption spectroscopy,and comprehensive electrochemical tests reveal the structural transformation and the Co coordination chemistry evolution of the CoS@HDC during cycling,providing fundamental insights into the sodium storage mechanism.

关键词： Sodium-ion batteries Cobalt sulfide nanoparticles Heteroatom-doped porous carbon matrix Synchrotron X-ray techniques Reaction mechanisms

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Recent advances in laser self-injection locking to high-Q microresonators

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Frontiers of physics 2023年第2期18卷 89-130页

作者： nikita M.Kondratiev Valery E.Lobanov Artem E.Shitikov Ramzil R.Galiev Dmitry A.Chermoshentsev nikita Yu.Dmitriev Andrey n.Danilin Evgeny A.Lonshakov Kirill n.Min’kov daria M.Sokol Steevy J.Cordette Yi-Han Luo Wei Liang Junqiu Liu Igor A.Bilenko Directed Energy Research Centre Technology Innovation InstituteAbu DhabiUnited Arab Emirates Russian Quantum Center MoscowRussia Skolkovo Institute of Science and Technology SkolkovoRussia Moscow Institute of Physics and Technology DolgoprudnyMoscow RegionRussia Faculty of Physics Lomonosov Moscow State UniversityMoscowRussia Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy Shenzhen 518048China Key Laboratory of nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Hefei national Laboratory University of Science and Technology of ChinaHefei 230026China

The stabilization and manipulation of laser frequency by means of an external cavity are nearly ubiquitously used in fundamental research and laser applications. While most of the laser light transmits through the cavity, in the presence of some back-scattered light from the cavity to the laser, the self-injection locking effect can take place, which locks the laser emission frequency to the cavity mode of similar frequency. The self-injection locking leads to dramatic reduction of laser linewidth and noise. Using this approach, a common semiconductor laser locked to an ultrahigh-Q microresonator can obtain sub-Hertz linewidth, on par with state-of-the-art fiber lasers. Therefore it paves the way to manufacture high-performance semiconductor lasers with reduced footprint and cost. Moreover, with high laser power, the optical nonlinearity of the microresonator drastically changes the laser dynamics, offering routes for simultaneous pulse and frequency comb generation in the same microresonator. Particularly, integrated photonics technology, enabling components fabricated via semiconductor CMOS process, has brought increasing and extending interest to laser manufacturing using this method. In this article, we present a comprehensive tutorial on analytical and numerical methods of laser self-injection locking, as well a review of most recent theoretical and experimental achievements.

关键词： self-injection locking laser stabilization microresonator nonlinearity single-frequency lasing multi-frequency lasing

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Hot deformation of Mg-Y-Zn alloy with a low content of the LPSO phase studied by in-situ synchrotron radiation diffraction

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Journal of Magnesium and Alloys 2020年第1期8卷 199-209页

作者： Klaudia Horváth Fekete daria Drozdenko Jan Capek Kristián Máthis Domonkos Tolnai Andreas Stark Gerardo Garcés Patrik Dobron Department of Physics of Materials Faculty of Mathematics and PhysicsCharles UniversityKe Karlovu 512116 PragueCzech Republic nuclear Physics Institute of the CAS 25068ˇRežCzech Republic Magnesium Research Center Kumamoto University2-39-1 Kurokami Chuo-ku860-8555 KumamotoJapan Laboratory for neutron Scattering and Imaging Paul Scherrer InstituteVilligen PSI5232Switzerland Institute of Materials Science Helmholtz-Zentrum GeesthachtMax-Planck Str.1GeesthachtD21502Germany Department of Physical Metallurgy CENIM-CSICAvenida Gregorio del Amo 8E-28040 MadridSpain

The compressive deformation behavior of the extruded WZ42(Mg98.5Y1Zn0.5 in at.%)magnesium alloy containing a low amount of long-period stacking ordered(LPSO)phase was studied by in-situ synchrotron radiation diffraction *** were conducted at temperatures between room temperature and 350℃.Detailed microstructure investigation was provided by scanning electron microscopy,particularly the backscattered electron imaging and electron backscatter diffraction *** results show that twinning lost its dominance and kinking of the LPSO phase became more pronounced with increasing deformation *** cracks of the LPSO phase and no debonding r at the interface between the LPSO phase and the Mg matrix were observed at temperatures above 200℃.At 350℃,the LPSO phase lost its strengthening effect and the deformation of the alloy was mainly realized by the dynamic recrystallization of the Mg matrix.

关键词： Magnesium alloy LPSO phase Kinking High temperature Synchrotron radiation diffraction

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