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Spherically Symmetric Problem of General Relativ.ty for a Fluid Sphere

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Journal of Modern Physics 2024年第4期15卷 401-415页

作者： v.lery v. v.siliev.leonid v. Fedorov Institute of Applied Mechanics of Russian Academy of Sciences Moscow Russia

The paper is dev.ted to a spherically symmetric problem of General Relativ.ty (GR) for a fluid sphere. The problem is solv.d within the framework of a special geometry of the Riemannian space induced by grav.tation. According to this geometry, the four-dimensional Riemannian space is assumed to be Euclidean with respect to the space coordinates and Riemannian with respect to the time coordinate. Such interpretation of the Riemannian space allows us to obtain complete set of GR equations for the external empty space and the internal spaces for incompressible and compressible perfect fluids. The obtained analytical solution for an incompressible fluid is compared with the Schwarzchild solution. For a sphere consisting of compressible fluid or gas, a numerical solution is presented and discussed.

关键词： General Relativ.ty Spherically Symmetric Problem Fluid Sphere

RANKL inhibition reduces lesional cellularity and Gαs v.riant expression and enables osteogenic maturation in fibrous dysplasia

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Bone Research 2024年第1期12卷 165-179页

作者： Luis F.de Castro Jarred M.Whitlock Zachary Michel Kristen Pan Jocelyn Taylor v.v.an Szymczuk Brendan Boyce Daniel Martin v.rdit Kram Rebeca Galisteo Kamran Melikov.leonid v.Chernomordik Michael T.Collins Alison M.Boyce Skeletal Disorders and Mineral Homeostasis Section National Institute of Dental and Craniofacial ResearchNational Institutes of HealthBethesdaMDUSA Section on Membrane Biology Eunice Kennedy Shriver National Institute of Child Health and Human DevelopmentNational Institutes of HealthBethesdaMDUSA Metabolic Bone Disorders Unit National Institute of Dental and Craniofacial ResearchNational Institutes of HealthBethesdaMDUSA Department of Plastic and Reconstructiv. Surgery The Johns Hopkins Medical InstitutionsBaltimoreMDUSA Department of Pathology and Laboratory Medicine University of Rochester Medical CenterRochesterNYUSA NIDCR Genomics and Computational Biology Core National Institute of Dental and Craniofacial ResearchNational Institutes of HealthBethesdaMDUSA

Fibrous dysplasia(FD)is a rare,disabling skeletal disease for which there are no established *** ev.dence supports inhibiting the osteoclastogenic factor receptor activ.tor of nuclear kappa-B ligand(RANKL)as a potential treatment *** this study,we inv.stigated the mechanisms underlying RANKL inhibition in FD tissue and its likely indirect effects on osteoprogenitors by ev.luating human FD tissue pre-and post-treatment in a phase 2 clinical trial of denosumab(NCT03571191)and in murine in v.v. and ex v.v. preclinical *** analysis of human and mouse tissue demonstrated increased osteogenic maturation,reduced cellularity,and reduced expression of the pathogenic Gαs v.riant in FD lesions after RANKL *** sequencing of human and mouse tissue supported these *** interaction between osteoclasts and mutant osteoprogenitors was further assessed in an ex v.v. lesion model,which indicated that the proliferation of abnormal FD osteoprogenitors was dependent on *** results from this study demonstrated that,in addition to its expected antiosteoclastic effect,denosumab reduces FD lesion activ.ty by decreasing FD cell proliferation and increasing osteogenic maturation,leading to increased bone formation within *** findings highlight the unappreciated role of cellular crosstalk between osteoclasts and preosteoblasts/osteoblasts as a driv.r of FD pathology and demonstrate a nov.l mechanism of action of denosumab in the treatment of bone disease.

关键词： dysplasia treatment finding

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铁镁电气石Y位阳离子主导的构效关系

硅酸盐学报 2024年第10期52卷 3192-3204页

作者：周琳张伟周磊郭铭董发勤 Kotov. Elena leonidov.a Kotov.leonid Nafanailov.chd 西南科技大学固体废物处理与资源化教育部重点实验室四川绵阳621010中国西南科技大学分析测试中心四川绵阳621010中国西南科技大学核废物与环境安全国防重点学科实验室四川绵阳621000中国西南科技大学环境与资源学院四川绵阳621010中国 Mining Museum St.Petersburg Mining UniversitySt Petersburg 199106Russia Department of Radiophysics and Electronics Syktyvkar State UniversitySyktyvkar 167001Russia

具有特异性对称结构的天然自发极化矿物—电气石被广泛应用于环保和医疗保健领域,厘清电气石成分-结构-性能之间的作用关系可为电气石行业提供性能最优的理想构型,为其他天然复杂矿物的构效分析和性能调控提供方法参考。通过对含铁电气... 详细信息

具有特异性对称结构的天然自发极化矿物—电气石被广泛应用于环保和医疗保健领域,厘清电气石成分-结构-性能之间的作用关系可为电气石行业提供性能最优的理想构型,为其他天然复杂矿物的构效分析和性能调控提供方法参考。通过对含铁电气石样品进行全成分、端元占位、晶体微结构和自发极化性能分析,揭示了铁镁电气石成分-微结构-自发极化性能的影响控制过程:在铁含量高于镁含量的电气石中,晶胞体积随镁含量升高而升高,Fe^(2+)含量越高且Z位含铁时,电气石多面体扭曲增强,固有电偶极矩增大;在铁含量低于镁含量的电气石中,晶胞体积随铁含量升高而增大,结构扭曲和固有电偶极矩随铁含量的升高而减弱,随Fe^(2+)含量增大而增大;自发极化性测试证明电气石的性能强弱与固有电偶极矩变化规律一致;整理过往文献数据,分析Y位阳离子主导下的电气石固有电偶极矩变化趋势,揭示以Fe元素为主要影响因素的构效关系:当Mg/Fe摩尔比小于1时,电气石性能随Fe含量的减小而减弱;当Mg/Fe摩尔比大于1时,电气石的性能随Fe含量减小而增强;而当Mg/Fe摩尔比大于2时,其自发极化性上升趋势则趋于平稳。

关键词：铁镁电气石 Y位阳离子自发极化性构效关系

Pulsed THz radiation under ultrafast optical discharge of v.cuum photodiode

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Frontiers of Optoelectronics 2024年第2期 100-113页

作者： Aleksandr A.Ushakov.Kseniia A.Mamaev. leonid v.Seleznev.Georgy E.Rizaev.v.adimir Bukin Timophey v.Dolmatov.Pav.l A.Chizhov.v.adimir Bagdasarov.Sergey v.Garnov Prokhorov.General Physics Institute of the Russian Academy of Sciences Physical Institute Russian Academy of Sciences Moscow Institute of Physics and Technology Russian Institute for Scientific and Technical Information

In this paper, we first present an experimental demonstration of terahertz radiation pulse generation with energy up to 5 pJ under the electron emission during ultrafast optical discharge of a v.cuum photodiode. We use a femtosecond optical excitation of metallic copper photocathode for the generation of ultrashort electron bunch and up to 45 kv.cm external electric field for the photo-emitted electron acceleration. Measurements of terahertz pulses energy as a function of emitted charge density, incidence angle of optical radiation and applied electric field hav. been prov.ded. Spectral and polarization characteristics of generated terahertz pulses hav. also been studied. The proposed semi-analytical model and simulations in COMSOL Multiphysics prov. the experimental data and allow for the optimization of experimental conditions aimed at flexible control of radiation parameters.

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Isotopic Composition of Dissolv.d Carbonates Meromictic Soda Lake Doroninskoe(Eastern Transbaikalia,Russia)

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 395-397页

作者： leonid v.zamana Sv.tlana v.BORZENKO Institute of Natural Resources Cryology and Ecology Siberian Branch of RAS

1 Introduction Meromictic soda Lake Doroninskoe localized in the intermountain area,filled with continental sediments of the Mesozoic,in the upper basin of the riv.r *** of its location are N51°14’42"E112°14’40",

关键词： Soda lake dissolv.d carbonates sulfate reduction hydrogen sulfide isotopic composition carbon oxygen

Hydrochemistry of Salt Lakes in Southeastern Transbaikalia(Russia) in the Time of Arid Phase of Climate Change at the Beginning of the XXI Century

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 36-38页

作者： leonid v.zamana Irina L.v.KHNINA Institute of Natural Resources Cryology and Ecology Siberian Branch of RAS

1 Introduction In the south of Eastern Transbaikalia in the border area with China and Mongolia,there are at least 300 saline without outlet *** are confined to the semi-arid zone Daurian steppes with pronounced continental salinization processes and are mostly located on the bottoms of the intermountain *** origin is related to ev.porativ. concentration of fresh waters lakes filling.

关键词： salt lakes chemical composition salinity of water sulfate reduction.

俄罗斯外贝加尔氟的水文地球化学异常(英文)

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中国地质 2010年第3期37卷 607-613页

作者： leonid v.zamana Institute of Natural Resources Ecology and Cryology of Siberian Branch RASChita Russia 672014

在本文中,5种类型的氟的水文地球化学异常被确定,它们的形成过程、在水环境中的流入物源以及浓度水平各异。对它们的特征也进行了讨论。

关键词：氟水文地球化学异常类型相对浓度外贝加尔

Thermodynamic Ev.luation of Mineral Balance in Water Thickness of the Soda Lake Doroninskoe(Eastern Transbaikalia,Russia)

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 123-124页

作者： Sv.tlana v.BORZENKO leonid v.zamana Daria S.SUv.ROv. Institute of Natural Resources Cryology and Ecology Siberian Branch of RAS Institute of the Earth's Crust Siberian Branch of RAS

In recent years,lakes,including salted,attract the attention of researchers,also when reconstructing last climate changes using the bottom sediments(Solotchina et al.,2008,et al.).In this case the different geochemical

关键词： Thermodynamic Ev.luation of Mineral Balance in Water Thickness of the Soda Lake Doroninskoe Eastern Transbaikalia,Russia

外贝加尔大骨节病地区水文地球化学特征分析(英文)

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中国地质 2010年第3期37卷 582-586页

作者： leonid v.zamana Institute of Natural Resources Ecology and Cryology of Siberian Branch RASChita672014Russia

本文通过对在外贝加尔大骨节病区水文地球化学研究结果表明,该地区天然水呈现出高浓度的磷(高达3.5mg/L),同时,锰、硅、铅等元素也呈现出高浓度的地球化学特征。分析水文地球化学数据,认为大骨节病可能与生物地球化学性质的多种因素有... 详细信息

本文通过对在外贝加尔大骨节病区水文地球化学研究结果表明,该地区天然水呈现出高浓度的磷(高达3.5mg/L),同时,锰、硅、铅等元素也呈现出高浓度的地球化学特征。分析水文地球化学数据,认为大骨节病可能与生物地球化学性质的多种因素有关系。进一步研究大骨节病的成因机制需要新的可靠的环境地球化学数据。

关键词：大骨节病生物地球化学特征地球化学特征饮用水磷,锰多因子因素