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Advances in femtosecond laser direct writing of fiber Bragg gratings in multicore fibers:technology,sensor and laser applications

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Opto-Electronic Advances 2022年第4期5卷 48-68页

作者： Alexey Wolf Alexander Dostovalov Kirill Bronnikov mikhail Skvortsov Stefan Wabnitz Sergey Babin Novosibirsk State University Novosibirsk 630090Russia Institute of Automation and Electrometry of the SB RAS Novosibirsk 630090Russia Department of Information Electronics and Telecommunications EngineeringSapienza University of RomeRome 00184Italy

In this article,we review recent advances in the technology of writing fiber Bragg gratings(FBGs)in selected cores of multicore fibers(MCFs)by using femtosecond laser *** writing technology of such a key element as the FBG opens up wide opportunities for the creation of next generation fiber lasers and sensors based on *** advantages of the technology are shown by using the examples of 3D shape sensors,acoustic emission sensors with spatially multiplexed channels,as well as multicore fiber Raman lasers.

关键词： multicore fiber fiber Bragg grating femtosecond laser micromachining fiber laser fiber sensor

Subharmonic mode locking of a Q-switched Nd:YAG laser

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Chinese Optics Letters 2023年第3期21卷 96-100页

作者： Alexey Gribanov mikhail Yakovin Dmitry Yakovin mikhail Mosin Institute of Automation and Electrometry Siberian Branch of the Russian Academy of SciencesNovosibirsk 630090Russia

A Q-switched Nd:YAG laser has been actively mode-locked at a subharmonic frequency for the first time,to the authors’*** laser operation mode is provided by a combination of a traveling wave acousto-optic modulator and a spherical cavity *** dynamics of laser generation is *** with a duration of 70 ps and a peak power of about 10 MW were *** presented are new results on obtaining high-power[~60 kW]picosecond tunable radiation in the~620 nm region based on frequency conversion of a superluminescent parametric generator pumped by such a laser.

关键词： Nd:YAG laser diode pumping Q switching mode locking parametric light generators

基于现场试井数据和岩心驱替试验的采油初期渗透率演化规律

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岩土力学 2023年第3期44卷 834-842页

作者： KOZHEVNIKOV V.Evgenii TURBAKOV S.mikhail RIABOKON p.Evgenii GLADKIKH A.Evgeniy pOpLYGIN V.Vladimir GUZEV A.mikhail 戚承志彼尔姆国立科研理工大学石油和天然气技术系俄罗斯彼尔姆614990 俄罗斯科学院远东分院应用数学研究所俄罗斯符拉迪沃斯托克690041 北京建筑大学土木与交通工程学院中国北京100044

油气开采过程中渗透率预测是一个非常重要的问题。由于油气储量衰竭导致渗透率降低,储层压力下降(有效压力增加),导致油气生产时间增加。对有效压力导致渗透率降低的问题进行了大量研究,主要是通过各种方法建立渗透率模型,如岩心驱替试... 详细信息

油气开采过程中渗透率预测是一个非常重要的问题。由于油气储量衰竭导致渗透率降低,储层压力下降(有效压力增加),导致油气生产时间增加。对有效压力导致渗透率降低的问题进行了大量研究,主要是通过各种方法建立渗透率模型,如岩心驱替试验和现场试井。前期研究结果表明,渗透率对有效压力具有幂律或指数依赖性,然而,预测渗透率的困难在于滞后现象,其原因尚不完全清楚。一些学者利用储层力学模型模拟渗透率以及解释滞后的原因,但该模型在油气生产初期有效压力波动较小时并不适用。在这项工作中,分析perm地区北部一个油田的试井数据得出:生产初期的储层渗透率很大程度上取决于流体产出量。基于陆相储层的试井数据,得到一个描述采油初期渗透率变化的模型。为验证该模型,根据专门开发的程序对陆相储层样品进行岩心驱替试验。岩心驱替结果表明,从试井数据中获得的模型具有高收敛性。利用计算机断层扫描(computed tomography,简称CT)和扫描电镜(scanning electron microscope,简称SEM)研究岩心孔隙的属性和结构,发现天然胶体的迁移是生产初期低黏土岩石渗透率下降的主要原因。

关键词：渗透率渗透率滞后胶体迁移岩心驱替多孔介质

periodical zonal character of damage near the openings inhighly-stressed rock mass conditions

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第2期8卷 164-169页

作者： Vladimir VMakarov mikhail AGuzev Vladimir NOdintsev Lyudmila SKsendzenko Far-Eastern Federal University VladivostokRussia Russian Academy of Sciences MoscowRussia

Rock mass damage at great depths near underground openings is often of a zonal ***,the classical elastoplastic theory fails to explain sufficiently all properties of zonal failure structures.A new non-Euclidean mathematical model for highly-stressed rock mass was developed based on the principles of mechanics of defected material and non-equilibrium *** were developed to determine model parameters that provide satisfactory correspondence between the experimental findings concerning faulted zonal structures near openings at great depths and mathematical *** mechanism of this phenomenon was discovered which consisted in a periodical character of stresses in the surrounding rock mass and development of tensile macrocracks at zones of maximal tangential *** relationships between the cracking zone width and rock mass strength were established.

关键词： Rock failure Openings Zones Modeling

Dodecagonal bilayer graphene quasicrystal and its approximants

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npj Computational Materials 2019年第1期5卷 73-82页

作者： Guodong Yu Zewen Wu Zhen Zhan mikhail I.Katsnelson Shengjun Yuan Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education and School of physics and Technology Wuhan UniversityWuhan 430072China Institute for Molecules and Materials Radboud UniversityHeijendaalseweg 135NL-6525 AJ NijmegenNetherlands

Dodecagonal bilayer graphene quasicrystal has 12-fold rotational order but lacks translational symmetry which prevents the application of band *** this paper,we study the electronic and optical properties of graphene quasicrystal with large-scale tight-binding calculations involving more than ten million *** propose a series of periodic approximants which reproduce accurately the properties of quasicrystal within a finite unit *** utilizing the band-unfolding method on the smallest approximant with only 2702 atoms,the effective band structure of graphene quasicrystal is *** features,such as the emergence of new Dirac points(especially the mirrored ones),the band gap at M point and the Fermi velocity are all in agreement with recent *** properties of quasicrystal states are identified in the Landau level spectrum and optical ***,our results show that the lattice mismatch is the dominant factor determining the accuracy of layered *** proposed approximants can be used directly for other layered materials in honeycomb lattice,and the design principles can be applied for any quasi-periodic incommensurate structures.

关键词： theory. layered periodic

A new species of the genus Eodorcadion Breuning from Alxa desert in Inner Mongolia, China(Coleoptera:Cerambycidae)

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Zoological Systematics 2019年第2期44卷 140-145页

作者： mikhail L.Danilevsky Xuefeng Chen Meiying Lin A.N.Severtzov Institute of Ecology and Evolution Russian Academy of SciencesLeninsky prospect 33Moscow 119071 Russia Qingshan District JiaxinweiyeBaotou CityInner Mongolia 014030China Key Laboratory of Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing 100101China

A new species, Eodorcadion(Ornatodorcadion) zhaoi sp. nov., is described from the Alxa desert in Inner Mongolia, China. A key to species of the subgenus Eodorcadion(Ornatodorcadion) is provided. The type specimens are... 详细信息

关键词： Lamiinae taxonomy new species palaearctic Region

A Multi-Material CCALE-MOF Approach in Cylindrical Geometry

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Communications in Computational physics 2014年第2期15卷 330-364页

作者： Marie Billaud Friess Jerome Breil pierre-Henri Maire mikhail Shashkov LUNAM Universite GeMUMR CNRS 6183Ecole Centrale NantesUniversite de Nantes1 rue de la NoeBP 9210144321 Nantes Cedex 3France Univ.Bordeaux CEACNRSCELIAUMR5107F-33400 TalenceFrance CEA CESTA 15 Avenue des Sabli`eresCS 6000133116 Le Barp CedexFrance Los Alamos National Laboratory XCP-4Los AlamosNM 87545USA.

In this paper we present recent developments concerning a Cell-Centered Arbitrary Lagrangian Eulerian(CCALE)strategy using the Moment Of Fluid(MOF)interface reconstruction for the numerical simulation of multi-material compressible fluid flows on unstructured grids in cylindrical ***,our attention is focused here on the following ***,we propose a new formulation of the scheme used during the Lagrangian phase in the particular case of axisymmetric ***,the MOF method is considered for multi-interface reconstruction in cylindrical ***,a method devoted to the rezoning of polar meshes is ***,a generalization of the hybrid remapping to cylindrical geometries is *** explorations are validated by mean of several test cases using unstructured grid that clearly illustrate the robustness and accuracy of the new method.

关键词： Cell-centered scheme Lagrangian hydrodynamics ALE MOF interface reconstruction Rezoning algorithm polar meshes hybrid remapping axisymmetric geometries.

Bioactive fibrous scaffolds with programmable release of polypeptides regulate inflammation and extracellular matrix remodeling

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Regenerative Biomaterials 2023年第1期10卷 522-532页

作者： Zehong Xiang Xinghua Guan Zhifang Ma Qiang Shi mikhail panteleev Fazly I.Ataullakhanov State Key Laboratory of polymer physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin 130022China University of Science and Technology of China HefeiAnhui 230026China Key Laboratory of polymeric Materials Design and Synthesis for Biomedical Function Soochow UniversitySuzhou 215123China Dmitry Rogachev National Research Center of pediatric Hematology Oncology and ImmunologyMoscow 117198Russia Faculty of physics Lomonosov Moscow State UniversityMoscow 119991Russia

Inflammation manipulation and extracellular matrix(ECM)remodeling for healthy tissue regeneration are critical requirements for tissue engineering *** this end,the bioactive polycaprolactone(pCL)-based scaffolds are fabricated to release aprotinin and thymosinβ4(Tβ4)in a programmable *** core part of the fiber is composed of hyaluronic acid and Tβ4,and the shell is pCL,which is further coated with heparin/gelatin/aprotinin to enhance *** in vitro assay demonstrates that the controlled release of aprotinin prevents initial excessive *** subsequent release of Tβ4 after 3 days induces the transition of macrophages from M1 into M2 *** manipulation of inflammatory response further controls the expression of transforming growth factor-βand fibroblast activation,which oversee the quantity and quality of ECM *** addition,the gradual degradation of the scaffold allows cells to proliferate within the *** vivo implant evaluation convinces that pCL-based scaffolds possess the high capability to control the inflammatory response and restore the ECM to normal ***,our work paves a new way to develop tissue engineering scaffolds for inflammation manipulation and ECM remodeling with peptide-mediated reactions.

关键词： bioactive scaffolds inflammation control extracellular matrix remodeling polypeptide release electrospinning

Burns and frostbite in the Red Army during World War Ⅱ

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Military Medical Research 2017年第3期4卷 121-126页

作者： Vladimir Sokolov Alexey Biryukov Igor Chmyrev mikhail Tarasenko pavel Kabanov Department of Thermal Injuries of the S.M. Kirov Military Medical Academy

The start of World War Ⅱ(WWⅡ) led to the deployment of combat troops in several continents. Destruction and many casualties among both the military and civilians became an inevitable consequence. A large amount of people injured were in need of life-saving treatment and a speedy return to duty. Intensive studies of the specific issues of diagnosis and treatment of thermal injury were conducted in the Soviet Union before the war. The first special units for patients with burn injuries were created, and the first specialists received their first clinical experience. The contributions of famous Soviet scientists in the development of the treatment of burns and frostbite in WWⅡ are studied in this article. The structure of thermal injuries among military personnel and the results of their treatment are shown. Treatment, classification and quantity frostbite in the structure of sanitary losses during the WWⅡ are studied in this article.

关键词： Thermal injury World War Ⅱ Statistics of burns and frostbite Specialized burn centers