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Third-harmonic generation and imaging with resonant Si membrane metasurface

Opto-electronic Advances 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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Numerical Simulation of Multicomponent Alloy Solidification

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Journal of Mechanics engineering and Automation 2014年第10期4卷 828-837页

作者： Vladimir Pavlovich Ginkin Svetlana Mikhailovna Ganina andrey Valentinovich Kartavykh MA TeK (Mathematical ecology) Ltd. Obninsk 249033 Russia Department of Mathematics and Software Institute for Physics and Power Engineering Obninsk 249033 Russia Department of Physical Chemistry National University of Science and Technology "MISIS" Moscow 119049 Russia Department of Functional and Constructional Nanomaterials Technological Institute for Superhard and Novel Carbon MaterialsMoscow 142190 Russia

A non-equilibrium model of multicomponent melt solidification has been developed in which a Stefan problem with two boundaries is solved numerically, the boundaries being between the solid phase and the two-phase transition zone and between the two-phase transition zone and the liquid phase. The two-phase zone is represented as a porous medium with variable porosity. The additional force resisting the melt flow due to porosity and introduced by analogy with Darcy＇s law is taken into account. Computer simulation has been performed of the experiment on Sn-20 wt.%Pb binary alloy solidification by the method of downward-directed crystallization along the gravity vector. The paper shows the results of a quasi two-dimensional benchmark experiment on horizontal （i.e., at the right angle to the gravity vector） directional solidification of a binary Sn-3 wt.%Pb alloy. The calculations were done using two crystallization models： the equilibrium model and the non-equilibrium one. It is shown that the non-equilibrium model gives a better description of the thermal field evolution and solute distribution caused by natural convection.

关键词： Solidification binary alloy mushy zone macrosegregation convection heat-mass transfer modelling comparison withexperimental results.

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Towards a standard diet-induced and biopsy-confirmed mouse model of non-alcoholic steatohepatitis: Impact of dietary fat source

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World Journal of Gastroenterology 2019年第33期25卷 4904-4920页

作者： Michelle L Boland Denise Oro Kirstine S T■lb■l Sebastian T Thrane Jens Christian Nielsen Taylor S Cohen David e Tabor Fiona Fernandes andrey Tovchigrechko Sanne S Veidal Paul Warrener Bret R Sellman Jacob Jelsing Michael Feigh Niels Vrang James L Trevaskis Henrik H Hansen Cardiovascular Renal and Metabolic DiseasesMedImmuneGaithersburgMD 20878United States Pharmacology GubraH■rsholm DK-2970Denmark

BACKGROUND The trans-fat containing AMLN(amylin liver non-alcoholic steatohepatitis,NASH)diet has been extensively validated in C57BL/6J mice with or without the Lep^ob/Lep^ob(ob/ob)mutation in the leptin gene for reliably inducing metabolic and liver histopathological changes recapitulating hallmarks of *** to a recent ban on trans-fats as food additive,there is a marked need for developing a new diet capable of promoting a compatible level of disease in ob/ob and C57BL/6J *** To develop a biopsy-confirmed mouse model of NASH based on an obesogenic diet with trans-fat substituted by saturated *** Male ob/ob mice were fed AMLN diet or a modified AMLN diet with trans-fat(Primex shortening)substituted by equivalent amounts of palm oil[Gubra amylin NASH,(GAN)diet]for 8,12 and 16 wk.C57BL/6J mice were fed the same diets for 28 *** and GAN diets had similar caloric content(40%fat kcal),fructose(22%)and cholesterol(2%)*** The GAN diet was more obesogenic compared to the AMLN diet and impaired glucose ***-confirmed steatosis,lobular inflammation,hepatocyte ballooning,fibrotic liver lesions and hepatic transcriptome changes were similar in ob/ob mice fed the GAN or AMLN diet.C57BL/6J mice developed a mild to moderate fibrotic NASH phenotype when fed the same *** Substitution of Primex with palm oil promotes a similar phenotype of biopsyconfirmed NASH in ob/ob and C57BL/6J mice,making GAN diet-induced obese mouse models suitable for characterizing novel NASH treatments.

关键词： Non-alcoholic steatohepatitis High-fat diet Mouse model Histopathology Fibrosis Liver biopsy Liver transcriptome

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Genomic Analysis of <i>Anabaena variabilis</i>Mutants PK17 and PK84 That Are Characterised by High Production of Molecular Hydrogen

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Advances in Microbiology 2013年第4期3卷 350-365页

作者： Sergey V. Shestakov Lidia e. Mikheeva andrey V. Mardanov Nikolai V. Ravin Konstantin G. Skryabin Faculty of Biology Moscow State University Moscow Russia

The use of cyanobacteria for producing molecular hydrogen is one of the desirable tasks of photobiotechnology. Some years ago, we isolated several chemically induced mutants of the cyanobacterium Anabaena variabilis ATCC 29413 that exhibited a high level of H2-production;but the genetic nature of these mutants remained unresolved. To reveal mutations that could be responsible for enhancement of H2-production in two independent mutants, PK17 and PK84, the pyrosequencing of their entire genomes was performed. The results were analyzed on the basis of comparison with the complete genome sequence of the reference strain Anabaena variabilis ATCC 29413. The genomes of mutants PK17 and RK84 contain 107 and 104 point deviations from the reference genome, respectively. The most probable reason for the increase of H2-production in mutant PK17 is the mutation identified in the gene hupL encoding the large subunit of uptake hydrogenase. A high level of H2-production in mutant PK84 could be the result of a mutation in a conserved part of the gene hypF, which participates in the post-translation maturation of hydrogenase complexes.

关键词： Cyanobacteria Hydrogen Metabolism Hydrogenases Pyrosequencing Mutants Anabaena

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enhanced generation of nondegenerate photon pairs in nonlinear metasurfaces

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Advanced Photonics 2021年第5期3卷 22-27页

作者： Matthew Parry Andrea Mazzanti Alexander Poddubny Giuseppe Della Valle Dragomir N.Neshev andrey A.Sukhorukov Australia National University Research School of PhysicsCanberraAustralia ARC Centre of excellence for Transformative Meta-Optical Systems CanberraAustralia Politecnico di Milano Dipartimento di FisicaMilanItaly ITMO University Department of PhysicsSaint PetersburgRussia Ioffe Institute Saint PetersburgRussia Consiglio Nazionale delle Ricerche Istituto di Fotonica e NanotecnologieMilanItaly

We predict theoretically a regime of photon-pair generation driven by the interplay of multiple bound states in the continuum resonances in nonlinear *** nondegenerate photon-pair generation is derived from the hyperbolic topology of the transverse phase matching and can enable orders-of-magnitude enhancement of the photon rate and spectral brightness,as compared to the degenerate *** show through comprehensive simulations that the entanglement of the photon pairs can be tuned by varying the pump polarization,which can underpin future advances and applications of ultracompact quantum light sources.

关键词： optics photonics light metasurface spontaneous parametric down-conversion entanglement

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新疆阿尔泰全新世双湖沉积物正构烷烃分布及其环境意义

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第四纪研究 2021年第4期41卷 965-975页

作者：赵佳玉王淑贤 andrey Darin 孙青董浩伟储国强中国科学院地质与地球物理研究所中国科学院新生代地质与环境重点实验室北京100029 中国科学院地球科学研究院北京100029 中国科学院大学北京100049 国家地质实验测试中心北京100037 Institute of Geology and Mineralogy Siberian Branch of Russian Academy of ScienceNovosibirsk 630090Russia 中国科学院生物演化与环境卓越创新中心北京100044

文章对新疆阿尔泰双湖沉积物进行了古气候、古环境变化研究。双湖(48°52'N,87°02'e)位于阿尔泰山中部,是山谷岩石滑塌阻塞形成的堰塞湖,湖长约1200 m,宽度约300 m,最大水深9 m。项目使用重力钻在双湖中心钻取了172 cm无扰动岩芯,根据... 详细信息

文章对新疆阿尔泰双湖沉积物进行了古气候、古环境变化研究。双湖(48°52'N,87°02'e)位于阿尔泰山中部,是山谷岩石滑塌阻塞形成的堰塞湖,湖长约1200 m,宽度约300 m,最大水深9 m。项目使用重力钻在双湖中心钻取了172 cm无扰动岩芯,根据核素测年(^(137)Cs,^(210)Pb,AMS^(14)C)建立了9.1 *** B.P.以来的时间标尺,以正构烷烃分布特征(ACL_(23~33)、nC_(27)/nC_(31)、P_(aq))为指标,重建了该区的古植被、古气候变化。沉积物中正构烷烃以高碳数为主,中长链正构烷烃存在显著的奇碳优势。链长指标(ACL_(23~33))、nC_(27)/nC_(31)指标、Paq之间具有很强的相关性关系,表明指标可能受到相似的气候驱动因素影响,反映了区域植被和湖泊水生生物的演替历史:9.1~8.8 *** B.P.期间水生植被输入较少,陆生植被中草本植物相对占比较高;8.8~3.3 *** B.P.期间大型水生植物大量繁殖,汇水区木本植物增多;3.3 *** B.P.至今湖泊周围的木本植物减少,草本植物相对占比增多,水生植物输入减少。双湖沉积物ACL_(23~33)指标自9.1 *** B.P.以来呈逐渐增加的趋势,可能表明温度逐渐增加,这一结果与前人在该区利用泥炭br-GDGT重建的温度序列具有相似的变化趋势,但在百-千年尺度上,温度变化不一致,可能与指标的敏感性和定年精度有关。

关键词：正构烷烃分布特征全新世阿尔泰山双湖

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丙二酰基人参皂苷对南洋参和线叶南洋参细胞生长及皂苷积累的影响

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中草药 2024年第23期55卷 8171-8184页

作者：吕思琴 Nosov Aleander Mihaylovich eugene A.Rogozhin andrey A.Gontcharov 杨玲东北林业大学林学院林木遗传育种全国重点实验室莫斯科国立罗门诺索夫大学生物系俄罗斯科学院植物生理研究所细胞生物学实验室俄罗斯科学院生物有机化学研究所植物防御肽实验室俄罗斯科学院远东分院联邦陆地生物多样性中心深圳北理莫斯科大学生物系植物生物学实验室

目的以南洋参Polyscias fruticose和线叶南洋参P. filicifolia的悬浮培养细胞为研究对象，研究在细胞培养过程中，丙二酰基人参皂苷（malonyl ginsenoside,M-GS）对细胞生长及皂苷合成的影响，以促进南洋参悬浮培养细胞的皂苷合成和积... 详细信息

目的以南洋参Polyscias fruticose和线叶南洋参P. filicifolia的悬浮培养细胞为研究对象，研究在细胞培养过程中，丙二酰基人参皂苷（malonyl ginsenoside,M-GS）对细胞生长及皂苷合成的影响，以促进南洋参悬浮培养细胞的皂苷合成和积累。方法以南洋参和线叶南洋参的细胞系（编号6a和VDK）为试验材料，在悬浮培养的第7天添加M-GS，分析添加M-GS对细胞生长以及细胞中多糖苷e、人参皂苷R0、多糖苷A和齐墩果酸皂苷A含量的影响。结果 M-GS对南洋参和线叶南洋参的生长均具有抑制作用，使其不能长期生存。M-GS可使南洋参6a细胞系的细胞密度以及干质量峰值提前出现，使细胞活力提前开始下降，缩短了细胞的培养周期。而线叶南洋参VDK细胞系的细胞密度、鲜质量以及干质量的峰值延迟出现，延长了细胞的培养周期。M-GS对南洋参6a细胞系的抑制作用比线叶南洋参VDK更强。在培养末期南洋参6a细胞系的细胞密度、活力、鲜质量以及干质量分别降低了25.43%、22.23%、46.56%以及45.56%。M-GS对南洋参和线叶南洋参细胞中皂苷积累的影响不同。对于南洋参6a细胞系，M-GS促进细胞中多糖苷e、多糖苷A、齐墩果酸皂苷A的合成，且对多糖苷e的促进能力最强（提高了79.67%），其次为齐墩果酸皂苷A（提高了70.67%），最后为多糖苷A（提高了19.67%），同时抑制了人参皂苷R0的含量（降低了74.00%）。对于线叶南洋参VDK细胞系，M-GS只促进了细胞中多糖苷A的合成，使其含量增加了63.29%，却抑制了细胞中多糖苷e、多糖苷A、齐墩果酸皂苷A的合成，且对多糖苷A抑制能力最强（降低了63.29%），其次为多糖苷e（减低了27.59%），最后为齐墩果酸皂苷A（减低了8.33%）。结论添加M-GS可以促进南洋参和线叶南洋参悬浮培养细胞的部分种类皂苷积累，但不宜于细胞长期培养；且M-GS对不同物种细胞系细胞中不同皂苷的影响不同，对南洋参6a细胞系的促进能力高于线叶南洋参VDK细胞系。因此在南洋参和线叶南洋参细胞悬浮培养中可根据培养细胞系和目的产物不同选择使用M-GS以提高目的皂苷产量。

关键词：南洋参线叶南洋参细胞培养丙二酰基人参皂苷多糖苷e 人参皂苷R0 多糖苷A 齐墩果酸皂苷A

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Molecular Transformation of C-, Si- and Ge-tetrachlorides in Liquid Phase

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材料科学与工程（中英文A版） 2013年第4期3卷 274-277页

作者： Iosif Grinvald Ivan Yurievich Kalagaev andrey Vorotyntsev evgenia Sytyagina Department of Chemistry Nizhny Novgorod State Technical University of R.E. Alekseev Nizhny Novgorod 603950 Russia

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Plasma-Catalytic Decomposition of 2,4-Dichlorophenol in a Dielectric Barrier Discharge with a Vermiculite ZiO2 Composite

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Advances in Chemical engineering and Science 2023年第4期13卷 318-335页

作者： Grigoriy I. Gusev andrey A. Gushchin Vladimir I. Grinevich ekaterina M. Baburina ekaterina S. Severgina Natalya e. Gordina Department of Industrial ecology Ivanovo State University of Chemical Technology Ivanovo Russia Department of Technology of Inorganic Substances Ivanovo State University of Chemistry and Technology Ivanovo Russia

The paper presents comparative kinetic characteristics of the decomposition of 2,4-dichlorophenol in a dielectric barrier discharge and a combined plasma-catalytic process. Vermiculite containing 5% zirconium was used as a catalyst. The destruction processes of 2,4-DCP proceed efficiently, the degree of decomposition increases in the combined plasma-catalytic process by a factor of 1.33 and reaches 80%. The experimental results were processed according to the first-order kinetic law (R2 > 0.97), according to which the effective constants (0.36 ± 0.04) and (0.51 ± 0.03) s-1 and the decomposition rates of 2,4-DCP (106 and 123 μmol/l·s) when treating model solutions without a catalyst and with vermiculite + Zr 5%, respectively, and the energy costs are 0.012 and 0.017 molecules/100eV. The main decomposition products present in the solution have been determined to be carboxylic acids, aldehydes, the contribution of which does not exceed 2%, as well as chloride ions, and in the gas phase they are carbon dioxide and molecular chlorine (the share of which does not exceed 1.5% of total chlorine content in the system).

关键词： 2 4-Dichlorophenol Dielectric Barrier Discharge Plasma Oxygen Treatment Water Treatment Catalyst Zirconium Vermiculite

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Impact of doping profiles on the formation of laser-active centers in bismuth-doped GeO_(2)–SiO_(2)glass fibers

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Photonics Research 2024年第2期12卷 260-270页

作者： SeRGeY ALYSHeV ALeXANDeR VAKHRUSHeV ALeKSANDR KHeGAI eLeNA FIRSTOVA KONSTANTIN RIUMKIN MIKHAIL MeLKUMOV LYUDMILA ISKHAKOVA andrey UMNIKOV SeRGeI FIRSTOV Prokhorov General Physics Institute of the Russian Academy of Sciences Dianov Fiber Optics Research Center119333 MoscowRussia Devyatykh Institute of Chemistry of High-Purity Substances of the Russian Academy of Sciences 603951 Nizhny NovgorodRussia

Multi-wavelength-band transmission technology based on the exploitation of the extended spectral region is considered as a potential approach to increase the transmission capacity in the deployed fiber-optic communication *** development of optical amplifiers operating in the O-,e-,S-,and U-telecom bands is an extremely important challenge for the successful implementation of this ***-doped fibers are of increasing interest as gain materials,which can be used to provide broadband amplification in the mentioned telecom *** is due to the ability of Bi ions incorporated into glass network to form bismuth active centers(BACs)with specific optical properties,which are primarily determined by the glass *** this work,the impact of the doping profiles of both Ge atoms as glass modifiers and Bi ions on the BACs formation is studied using a series of bismuth-doped fibers fabricated by the modified chemical vapor deposition(MCVD)*** Bi-to-BACs conversion efficiency in various spatial regions of the studied samples is *** is turned out that for high-Bi concentration regions,the conversion efficiency is very low(less than 10%).In addition,the relationship of the conversion efficiency to the distribution of Bi ions and/or Ge atoms is ***,a continuous-wave laser at 1.46μm with a record slope efficiency of 80%is demonstrated using a Bi-doped fiber with confined doping profile,where the Bi-to-BACs conversion efficiency is 35%.This paper provides new information which might help to facilitate understanding of the features of Bi-doped fibers and their potentially achievable characteristics.

关键词： fiber fibers bismuth

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