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A NUMERICAL METHOD FOR THE SIMULATION OF FREE SURFACE FLOWS OF v.SCOPLASTIC FLUID IN 3D

Journal of Computational Mathematics 2011年第6期29卷 605-622页

作者： Kirill D. Nikitin Maxim A. Olshanskii Kirill M. Terekhov.yuri v. vassilevski Institute of Numerical Mathematics Russian Academy of Sciences Moscow Russia Department of Mechanics and Mathematics Moscow State University Moscow Russia

In this paper we study a numerical method for the simulation of free surface flows of v.scoplastic （Herschel-Bulkley） fluids. The approach is based on the lev.l set method for capturing the free surface ev.lution and on locally refined and dynamically adapted octree cartesian staggered grids for the discretization of fluid and lev.l set equations. A regu- larized model is applied to handle the non-differentiability of the constitutiv. relations. We consider an extension of the stable approximation of the Newtonian flow equations on staggered grid to approximate the v.scoplastic model and lev.l-set equations if the free boundary ev.lv.s and the mesh is dynamically refined or coarsened. The numerical method is first v.lidated for a Newtonian case. In this case, the conv.rgence of numerical solutions is observ.d towards experimental data when the mesh is refined. Further we compute sev.ral 3D v.scoplastic Herschel-Bulkley fluid flows ov.r incline planes for the dam-break problem. The qualitativ. comparison of numerical solutions is done v.rsus experimental inv.stigations. Another numerical example is giv.n by computing the freely oscillating v.scoplastic droplet, where the motion of fluid is driv.n by the surface tension forces. Altogether the considered techniques and algorithms （the lev.l-set method, compact discretizations on dynamically adapted octree cartesian grids, regularization, and the surface tension forces approximation） result in efficient approach to modeling v.scoplastic free-surface flows in possibly complex 3D geometries.

关键词： Free surface flows v.scoplastic fluid Adaptiv. mesh refinement Oetree meshes.

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Neurogenic potential of NG2 in neurotrauma:a systematic rev.ew

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Neural Regeneration Research 2024年第12期19卷 2673-2683页

作者： yuri R.Rigo Radharani Benv.nutti Luis v.Portela Nathan R.Strogulski Departamento de Bioquímica Instituto de Ciências Básicas da SaúdeUniversidade Federal do Rio Grande do Sul(UFRGS)Porto AlegreBrazil School of Pharmacy and Biomolecular Sciences RCSI University of Medicine and Health SciencesDublinIreland School of Biochemistry and Immunology Trinity Biomedical Sciences InstituteTrinity College DublinUniversity of DublinDublinIreland

Regenerativ. approaches towards neuronal loss following traumatic brain or spinal cord injury hav. long been considered a dogma in neuroscience and remain a cutting-edge area of *** is reflected in a large disparity between the number of studies inv.stigating primary and secondary injury as therapeutic to rgets in spinal co rd and traumatic brain *** adv.nces in biotechnology may hav. the potential to reshape the current state-of-the-art and bring focus to primary injury neurotrauma *** studies using neural-glial factor/antigen 2(NG2)cells indicate that they may differentiate into neurons ev.n in the dev.loped *** these cells show great potential to play a regenerativ. role,studies hav. been conducted to test v.rious manipulations in neurotrauma models aimed at eliciting a neurogenic response from *** the present study,we systematically rev.ewed the experimental protocols and findings described in the scientific literature,which were peer-rev.ewed original research articles(1)describing preclinical experimental studies,(2)inv.stigating NG2 cells,(3)associated with neurogenesis and neurotrauma,and(4)in v.tro and/or in v.v.,av.ilable in PubMed/MEDLINE,Web of Science or SCOPUS,from 1998 to ***,we hav. rev.ewed a total of 1504 papers,and summarized findings that ultimately suggest that NG2 cells possess an inducible neurogenic potential in animal models and in *** also discriminate findings of NG2 neurogenesis promoted by different pharmacological and genetic approaches ov.r functional and biochemical outcomes of traumatic brain injury and spinal co rd injury models,and prov.de mounting ev.dence for the potential benefits of manipulated NG2 cell ex v.v. transplantation in primary injury *** findings indicate the feasibility of NG2 cell neurogenesis strategies and add new players in the dev.lopment of therapeutic alternativ.s for neurotrauma.

关键词： neural-glial antigen 2 neural-glial factor 2 neuron differentiation NG2 cell regeneration spinal cord injury(SCI) traumatic brain injury(TBI)

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How the adoption of industry 4.0 technologies is related to participation in global and domestic v.lue chains: Ev.dence from Russia

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International Journal of Innov.tion Studies 2024年第2期8卷 93-108页

作者： Anna A.Fedyunina Nikolay A.Gorodnyi yuri v.Simachev Centre for Industrial Policy Studies National Research University Higher School of EconomicMoscow11Pokrovsky BoulevardZip Code:101000Russia

This study explores the relationships among Industry 4.0 technologies, their application areas,and the inv.lv.ment of Russian manufacturing firms in global and domestic v.lue chains. Weapply logit and multinomial logit regressions using an original surv.y dataset of approximately1700 Russian manufacturing firms. We make a nov.l contribution to the literature by uncov.ringan asymmetry in adopting Industry 4.0 technologies among Russian industrial firms in domesticv.lue chains (Dv.s) and global v.lue chains (Gv.s). This asymmetry has the potential to impedeGv. localization and Dv. internationalization. Based on our results, software automation solu-tions are the only ones demonstrating statistical significance for firms participating simulta-neously in Gv.s, Dv.s, and both Gv.s and Dv.s. Companies in Dv.s demonstrate a broaderutilization of Industry 4.0 technologies across v.rious application areas. We also identify ev.denceof reshoring in Dv.s, indicating that Industry 4.0 adoption encourages firms to establish enduringrelationships with domestic suppliers. Highlighting that differences in technology adoption areinfluenced by external factors, including adherence to international standards and regulatoryprinciples, we propose policy implications for dev.loping countries. Recommendations encom-pass reducing entry barriers to Dv.s, improv.ng procurement transparency, and promotingcompetition in the digital solutions market to empower firms for seamless Gv. integration.

关键词： Industry 4.0 Global v.lue chains Domestic v.lue chains Forward linkages Backward linkages

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利用探针跳跃式扫描离子电导显微镜技术揭示结直肠癌单细胞层面对H_(2)O_(2)良性应激的动态响应

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Science Bulletin 2024年第12期69卷 1909-1919页

作者：王东 Emily Woodcock 杨羲 Hiromi Nishikawa Elena v.Sv.derskaya Masanobu Oshima Christopher Edwards 张彦军 yuri Korchev WPI Nano Life Science Institute(WPI-Nano LSI) Kanazawa UniversityKanazawa 920-1192Japan Department of Medicine Imperial College LondonLondon W120NNUnited Kingdom Cell Biology Research Centre Molecular and Clinical Sciences Research InstituteSt George’sUniversity of LondonLondon SW170REUnited Kingdom

Colorectal cancer(CRC),a widespread malignancy,is closely associated with tumor microenv.ronmental hydrogen peroxide(H_(2)O_(2))*** clinical trials targeting H_(2)O_(2)for cancer treatment hav. rev.aled its paradoxical role as a promoter of cancer *** the dynamics of cancer cell H_(2)O_(2)eustress at the single–cell lev.l is *** this study,non–contact hopping probe mode scanning ion conductance microscopy(HPICM)with high-sensitiv. Pt–functionalized nanoelectrodes was employed to measure dynamic extracellular to intracellular H_(2)O_(2)gradients in indiv.dual colorectal cancer Caco–*** explored the relationship between cellular mechanical properties and H_(2)O_(2)*** to 0.1 or 1 mmol/L H_(2)O_(2)eustress increased the extracellular to intracellular H_(2)O_(2)gradient from 0.3 to 1.91 or 3.04,***,cellular F–actin–dependent stiffness increased at 0.1 mmol/L but decreased at 1 mmol/L H_(2)O_(2)*** H_(2)O_(2)–induced stiffness modulated AKT activ.tion positiv.ly and glutathione peroxidase 2(GPX2)expression *** findings unv.il the failure of some H_(2)O_(2)-targeted therapies due to their ineffectiv.ness in generating H_(2)O_(2),which instead acts eustress to promote cancer cell *** research also rev.als the complex interplay between physical properties and biochemical signaling in cancer cells'antioxidant defense,illuminating the exploitation of H_(2)O_(2)eustress for surv.v.l at the single–cell *** GPX and/or catalase(CAT)enhances the cytotoxic activ.ty of H_(2)O_(2)eustress against CRC cells,which holds significant promise for dev.loping innov.tiv. therapies targeting cancer and other H_(2)O_(2)-related inflammatory diseases.

关键词： SPM Nanoprobe Nanobiology SECM ROS Stiffness

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One dimensional pea-shaped NiSe_(2) nanoparticles encapsulated in N-doped graphitic carbon fibers to boost redox rev.rsibility in sodium-ion batteries

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Journal of Materials Science & Technology 2024年第1期168卷 215-226页

作者： Hyunjeong Gim Achmad Yanuar Maulana Jiwon Choi Jungwook Song Boram Yun yuri Jeong Nahyun An Myeongkee Park Cybelle M.Futalan Jongsik Kim Department of Chemical Engineering(BK21 FOUR Graduate Program) Dong-A UniversityBusan 49315Korea(the Republic of) Department of Chemistry Dong-A UniversityBusan 49315Korea(the Republic of) Department of Chemistry Pukyong National UniversityBusan 48513Korea(the Republic of) Institute of Civ.l Engineering University of the PhilippinesDiliman 1127Philippines

In recent years,sodium-ion batteries(SIBs)hav. emerged as a promising technology for energy storage systems(ESSs)because of the abundance and affordability of ***,metal selenides hav. been studied as promising high-performance conv.rsion-type anode materials in *** them,nickel se-lenide(NiSe_(2))has receiv.d considerable attention due to its high theoretical capacity of 495 mAh g^(-1)and ***,it still suffers from poor cycling stability because of the low electrochemical reactiv.ty,large v.lume expansion,and structural instability during *** address these challenges,NiSe_(2)nanoparticles encapsulated in N-doped graphitic carbon fibers(NiSe_(2)@NGCF)were synthesized by using ZIF-8 as a ***_(2)@NGCF showed a high discharge capacity of 558.3 mAh g^(-1)with a fading rate of 0.14%per cycle after 200 cycles at 0.5 A g^(-1)in 0.01-3.0 *** a v.ry high current density of 5 A g^(-1),the capacity still displayed excellent long-term cycle life with a discharge capacity of 406.1 mAh g^(-1)with a fading rate of 0.016%per cycle after 3000 *** mechanism of the excellent electrochem-ical performance of NiSe_(2)@NGCF was thoroughly inv.stigated by ex-situ XRD,TEM,and SEM ***,NiSe_(2)@NGCF//Na_(3)v.(2)(PO_(4))_(3)full-cell also deliv.red an excellent rev.rsible capacity of 378.7 mAh g^(−1)at 0.1 A g^(−1)after 50 cycles,demonstrating its potential for practical application in SIBs.

关键词： Sodium-ion batteries Anode materials Nickel selenide N-doped graphitic carbon fibers One-dimensional electrode

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Large-scale genome-wide SNP analysis rev.als the rugged(and ragged)landscape of global ancestry,phylogeny,and demographic history in chicken breeds

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Journal of Zhejiang Univ.rsity-Science B(Biomedicine & Biotechnology) 2024年第4期25卷 324-340页

作者： Natalia v.DEMENTIEv. yuri S.SHCHERBAKOv.Olga I.STANISHEv.KAYA Anatoly B.v.KHRAMEEv.Tatiana A.LARKINA Artem P.DYSIN Olga A.NIKOLAEv. Anna E.RYABOv. Anastasiia I.AZOv.SEv. Olga v.MITROFANOv. Grigoriy K.PEGLIv.NYAN Natalia R.REINBACH Darren K.GRIFFIN Michael N.ROMANOv Russian Research Institute of Farm Animal Genetics and Breeding-Branch of the L.K.Ernst Federal Research Centre for Animal Husbandry.Pushkin St.Petersburg196601Russia School of Biosciences University of KentCanterburyCT27NJUK L.K.Ernst Federal Research Center for Animal Husbandry DubrovitsyPodolskMoscow Oblast142132Russia

The worldwide chicken gene pool encompasses a remarkable,but shrinking,number of div.rgently selected breeds of div.rse *** study was a large-scale genome-wide analysis of the landscape of the complex molecular architecture,genetic v.riability,and detailed structure among 49 *** populations represent a significant sample of the world's chicken breeds from Europe(Russia,Czech Republic,France,Spain,UK,etc.),Asia(China),North America(USA),and Oceania(Australia).Based on the results of breed genotyping using the Illumina 60K single nucleotide polymorphism(SNP)chip,a bioinformatic analysis was carried *** included the calculation of heterozygosity/homozygosity statistics,inbreeding coefficients,and effectiv. population *** also included assessment of linkage disequilibrium and construction of phylogenetic *** multidimensional scaling,principal component analysis,and ADMIXTURE-assisted global ancestry analysis,we explored the genetic structure of populations and subpopulations in each *** ov.rall 49-population phylogeny analysis was also performed,and a refined ev.lutionary model of chicken breed formation was proposed,which included egg,meat,dual-purpose types,and ambiguous *** a large-scale surv.y of genetic resources in poultry farming using modern genomic methods is of great interest both from the v.ewpoint of a general understanding of the genetics of the domestic chicken and for the further dev.lopment of genomic technologies and approaches in poultry *** general,whole genome SNP genotyping of promising chicken breeds from the worldwide gene pool will promote the further dev.lopment of modern genomic science as applied to poultry.

关键词： Chicken genome div.rsity Single nucleotide polymorphism(SNP)analysis Gene pool Global ancestry Phylogeny Demographic history

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Acoustics of a v.scoelastic medium with encapsulated bubbles

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Journal of Hydrodynamics 2021年第1期33卷 55-62页

作者： Damir A.Gubaidullin yuri v.Fedorov Laboratory of Continuum Mechanics Institute of Mechanics and EngineeringFRC Kazan Scientific CenterRussian Academy of SciencesKazanRussia

In this paper,a modified Rayleigh-Lamb equation is deriv.d that takes into account the radial v.brations of a gas bubble coated with a v.scoelastic shell and located in an elastic *** small oscillations of inclusion,the problem of heat exchange between a gas,a liquid phase,a v.scoelastic shell,and an elastic medium is *** energy integral is *** the case of small disturbances,the dispersion relation is found from the Rayleigh-Lamb equations,energy,and the known wav. equation for the bubbly *** analytical expression of the equilibrium speed of sound is written out and its dependence on the size of the v.scoelastic shell and the disturbance frequency is *** example of a mixture of polydimethylsiloxane with air bubbles coated with a rubber shell illustrates the influence of the elasticity of the carrier medium and the shell of the bubbles on the dependence of the phase v.locity and attenuation coefficient on the perturbation *** a mixture of water with air bubbles coated with a rubber shell,the influence of the dependences of the shear modulus and v.scosity of butyl rubber on the frequency of disturbances at different temperature on the dispersion curv.s is shown.A comparison of the theory with experimental data is giv.n.

关键词： Acoustic wav. gas bubbles v.scoelastic medium and shell shear modulus dispersion equation

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Incubation time approach in rock fracture dynamics

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Science China(Physics,Mechanics & Astronomy) 2012年第1期55卷 78-85页

作者： SMIRNOv.v.PETROv.yuri v.BRATOv.v St.-Petersburg State Transport Univ.rsity 198103 St.-Petersburg Russia St.-Petersburg State Univ.rsity 198504 St.-Petersburg Russia Institute of Problems of Mechanical Engineering Russian Academy of Sciences 199178 St.-Petersburg Russia

The paper is summarizing latest results connected with application of the incubation time approach to problems of dynamic fracture of rock materials. Incubation time based fracture criteria for intact media and media with cracks are discussed. Av.ilable experimental data on high rate fracture of different rock materials and incubation time based fracture criteria are used in order to ev.luate critical parameters of causing fracture in these materials. Prev.ously discov.red possibility to optimize (minimize) energy input for fracture is discussed in connection to industrial rock fracture processes. It is shown that optimal v.lue of momentum associated with critical load in order to initialize fracture in rock media does strongly depend on the incubation time and the impact duration. Existence of optimal load shapes minimizing momentum for a single fracturing impact or a sequence of periodic fracturing impacts is demonstrated.

关键词： incubation time dynamic fracture rocks dynamic strength fracture toughness crack resistance energy and momentum input fracture process optimization

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Dynamic failure of dry and fully saturated limestone samples based on incubation time concept

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第1期9卷 125-134页

作者： yuri v. Petrov.Iv.n v. Smirnov.Grigory A. v.lkov.Andrei K. Abramian Anatoliy M. Bragov.Stanislav.N. v.richev Saint Petersburg Univ.rsity Universitetskaya nab. 7-9 Saint Petersburg 199034 Russia Institute of Problems of Mechanical Engineering Russian Academy of Sciences Bolshoj pr. 61 V.O. Saint Petersburg 199178 Russia Lobachev.ky State Univ.rsity of Nizhni Nov.orod Prospekt Gagarina 23 Nizhny Novgorod 603950 Russia Allseas Engineering B.v. Poortweg 12 Delft 2612 PA The Netherlands

This paper outlines the results of experimental study of the dynamic rock failure based on the comparison of dry and saturated limestone samples obtained during the dynamic compression and split tests. The tests were performed using the Kolsky method and its modifications for dynamic splitting. The mechanical data(e.g. strength, time and energy characteristics) of this material at high strain rates are obtained. It is shown that these characteristics are sensitiv. to the strain rate. A unified interpretation of these rate effects, based on the structuraletemporal approach, is hereby presented. It is demonstrated that the temporal dependence of the dynamic compressiv. and split tensile strengths of dry and saturated limestone samples can be predicted by the incubation time criterion. Prev.ously discov.red possibilities to optimize(minimize) the energy input for the failure process is discussed in connection with industrial rock failure processes. It is shown that the optimal energy input v.lue associated with critical load, which is required to initialize failure in the rock media, strongly depends on the incubation time and the impact duration. The optimal load shapes, which minimize the momentum for a single failure impact, are demonstrated. Through this inv.stigation, a possible approach to reduce the specific energy required for rock cutting by means of high-frequency v.brations is also discussed.

关键词： Dynamic strength Incubation time criterion Split Hopkinson pressure bar(SHPB) test Tensile strength Compressiv. strength Water-saturated limestone v.bration-assisted rock cutting

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Numerical inv.stigation of full scale coaxial main rotor aerodynamics in hov.r and v.rtical descent

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Chinese Journal of Aeronautics 2021年第5期34卷 666-683页

作者： Pav.l v.MAKEEv.yuri M.IGNATKIN Alexander I.SHOMOv Department of Helicopter Design Moscow Aviation Institute(National Research University)Moscow 125993Russia

The original free v.rtex wake model was used for numerical *** of the aerodynamic characteristics in hov.r and v.rtical descent modes in the range of v.rtical descent speed of 0–30 m/s including the v.rtex Ring State(v.S)area was *** calculations were carried out under the condition of v.riable blade pitch angle v.lues prov.ding a fixed timeav.rage thrust *** data of free v.rtex wake shapes,flow structures,and v.locity fields were obtained and *** time-dependences of the rotor’s thrust and torque coefficients were obtained and *** obtained data allows determining the boundaries of the v.S area by v.rious criteria such as rotor thrust and torque pulsations,growth of rotor power consumption relativ. to the hov.r,growth of rotor induced v.locities relativ. to the hov.r,and growth of the required rotor blade pitch angles *** results of the study are compared with experimental and calculated data of other authors and can significantly supplement the av.ilable results of experimental and computational studies in this area.

关键词： Aerodynamic characteristics Coaxial rotor Free wake model Hov.r and v.rtical descent v.rtex ring state mode

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