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Experimental and petrological constraints on local-scale interaction of biotite-amphibole gneiss with H_2O-CO_2-(K,Na) Cl fluids at middle-crustal conditions:Example from the Limpopo Complex,South Africa

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Geoscience Frontiers 2012年第6期3卷 829-841页

作者： Oleg G.Safonov Elizaveta I.Kovaleva Svetlana A.Kosova H.M.Rajesh georgy A.belyanin Maria A.Golunova Dirk D.Van Reenen Institute of Experimental Mineralogy RAS ChernogolovkaMoscow Region 142432.Russia Department of Petrology.Moscow State University Moscow 119899Russia Department of Geology University of JohannesburgP.O.Box 524Auckland Park 2006JohannesburgSouth Africa Labor fur Geochronologie Department fur LithospharenforschungUniversitat WienAlthanstrasse 14A-1090 ViennaAustria Institute of Experimental Mineralogy RAS ChernogolovkaMoscow Region 142432Russia Department of Geology University of JohannesburgP.O.Box 524Auckland Park 2006Johannesburg.South Africa

Reaction textures and fluid inclusions in the -2.0 Ga pyroxene-bearing dehydration zones within the Sand River biotite-hornblende orthogneisses （Central Zone of the Limpopo Complex） suggest that the formation of these zones is a result of close interplay between dehydration process along ductile shear zones triggered by H2O-CO2-salt fluids at 750--800 ℃ and 5.5--6.2 kbar, partial melting, and later exsolution of residual brine and H2O-CO2 fluids during melt crystallization at 650--700 ℃. These processes caused local variations of water and alkali activity in the fluids, resulting in various mineral assemblages within the dehydration zone. The petrological observations are substantiated by experiments on the interaction of the Sand River gneiss with the H2O-CO2-（K, Na）Cl fluids at 750 and 800 ℃ and 5.5 kbar. It follows that the interaction of biotite-amphibole gneiss with H2O-CO2-（K, Na）CI fluids is accompanied by partial melting at 750--800 ℃. Orthopyroxene-bearing assemblages are characteristic for temperature 800 ℃ and are stable in equilibrium with fluids with low salt concentrations, while salt-rich fluids produce clinopyroxene-bearing assemblages. These observations are in good agreement with the petrological data on the dehydration zones within the Sand River olthogneisses.

关键词： Charnockite Fluid-rock interaction CO2-rich fluids NaCl-KCl brines Partial melting Experimental petrology

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Pulsed THz radiation under ultrafast optical discharge of vacuum photodiode

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Frontiers of Optoelectronics 2024年第2期17卷 99-112页

作者： Aleksandr Ushakov Kseniia Mamaeva Leonid Seleznev georgy Rizaev Vladimir Bukin Timophey Dolmatov Pavel Chizhov Vladimir Bagdasarov Sergey Garnov Prokhorov General Physics Institute of the Russian Academy of Sciences Moscow 119991Russia Physical Institute Russian Academy of SciencesMoscow 119991Russia Moscow Institute of Physics and Technology Dolgoprudny 141700Russia Russian Institute for Scientific and Technical Information Moscow 125190Russia

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 vacuum *** 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 *** of terahertz pulses energy as a function of emitted charge density,incidence angle of optical radiation and applied electric field have been *** and polarization characteristics of generated terahertz pulses have also been *** proposed semi-analytical model and simulations in COMSOL Multiphysics prove the experimental data and allow for the optimization of experimental conditions aimed at flexible control of radiation parameters.

关键词： Electron emission Vacuum photodiode Ultrafast excitation Terahertz

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Geochronological,Geochemical and Paleomagnetic Clues for Existence of a~2.1Ga Dyke Generation in the Mashishing Area,South Africa

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 71-页

作者： Herve Wabo georgy belyanin Michiel O.de Kock Fabien Humbert Ulf Soderlund Léonie P.Maré Jan Kramers Nicolas J.Beukes Paleoproterozoic Mineralization Research Group(the PPM research group) DST-NRF Centre of Excellence for Integrated Mineral and Energy Resource Analysis(CIMERA) Department of GeologyUniversity of Johannesburg Department of Geology Lund University Council for Geoscience

Dyke swarms are widespread throughout the Kaapvaal Craton(KC)in South Africa and have been documented in some *** to date,only the^2.9 Ga SE-trending and the^2.7 to^2.66 Ga radiating dyke arrays are

关键词： Geochemical and Paleomagnetic Clues for Existence of a Geochronological South Africa Dyke Generation in the Mashishing Area Ga

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Assessment the effect of Dapoxetine and/or Acetaminophen in rats;neurochemicals and oxidative stress biomarkers evaluation

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Brain Science Advances 2024年第1期10卷 57-71页

作者： Gehan S.georgy Ibrahim M.Ibrahim Laila Mohamed E.Amer Ebtehal Mohammad F. Pharmacology Department Egyptian Drug Authority(EDA)Giza P.O.29Egypt Molecular Drug Evaluation Department Egyptian Drug Authority(EDA)Giza P.O.29Egypt Histology Department Faculty of MedicineAl-Azhar UniversityDamietta P.O.11651Egypt

Dapoxetine is a newer anti-depressant that is used for severe forms of depression via selective serotonin reuptake inhibition *** aimed to evaluate the effect of different doses of dapoxetine lonely or with acetaminophen(AMP).Seven groups of albino rats were used where dapoxetine was administered orally at the doses of 3,5,and 8 mg/kg body weight for a period of 14 days in groups 2,4,and 6,***(67.5 mg/kg body weight)was co-administered with dapoxetine(3,5,and 8 mg/kg body weight)for 14 days in groups 3,5 and 7,*** in mid and high dose plus AMP increased body weight and hematological *** and rearing were declined with mid and high doses of dapoxetine+AMP,contrary to *** was decreased with high doses of dapoxetine+*** dose of dapoxetine+AMP induced lowering of serotonin and dopamine as well as increasing of *** derived neurotrophic factor was decreased in all *** stress biomarkers were augmented with high dose of dapoxetine+*** doses of dapoxetine and/or AMP induced loss of the Purkinje cell layer at *** high dose of dapoxetine+AMP denotes behavioral,histopathological and neurochemical alterations,even though no serotonin syndrome occurs.

关键词： acetaminophen dapoxetine neurotransmitters oxidative stress biomarkers

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3,6-Bis-β-Dicarbonylsubstituted Carbazoles Bearing N-Spacers and Their Eu(III) Complexes as Immunofluorescent Labelling Agents

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International Journal of Organic Chemistry 2024年第1期14卷 20-31页

作者： Dmitry E. Pugachev georgy V. Zatonsky Tatyana S. Kostryukova Anna G. Shubina Nikolay V. Vasiliev Department of Biological Microanalysis FGUP State Research Institute of Biological Engineering Moscow Russia Department of Theoretical and Applied Chemistry State University of Education Mytishchi Russia

New reagents for immunofluorescence analysis of carbazole series containing fluorinated β-dicarbonyl fragments and carboxylic substituent groups separated by spacers of different lengths from the light-gathering carbazole scaffold have been developed. The markers in complex with Eu3+ ions possess stability in the aqueous phase, intense and prolonged luminescence (τ 550 - 570 μs) with characteristic emission maxima in the region of 615 nm and excitation wavelengths in the region of 380 - 390 nm, which distinguishes them from most of the analogs used. In the study of marker conjugation with streptavidin, a reagent containing 4 - 5 europium labeling complexes based on spacer-containing carbazole tetraketone was obtained. The marker-doped silicate nanoparticles exhibit intense and long-lived luminescence in the characteristic region.

关键词： Fluorescence Immunoassay Fluorinated β-Diketones Carbazole Europium Complexes Streptavidin Nanodispersions

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Exploring van der Waals materials with high anisotropy:geometrical and optical approaches

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Light(Science & Applications) 2024年第4期13卷 645-653页

作者： Aleksandr S.Slavich georgy A.Ermolaev Mikhail K.Tatmyshevskiy Adilet N.Toksumakov Olga G.Matveeva Dmitriy V.Grudinin Kirill V.Voronin Arslan Mazitov Konstantin V.Kravtsov Alexander V.Syuy Dmitry M.Tsymbarenko Mikhail S.Mironov Sergey M.Novikov Ivan Kruglov Davit A.Ghazaryan Andrey A.Vyshnevyy Aleksey V.Arsenin Valentyn S.Volkov Kostya S.Novoselov Moscow Center for Advanced Studies Kulakova str.20Moscow 123592Russia. Emerging Technologies Research Center XPANCEOInternet CityEmmay TowerDubaiUnited Arab Emirates. Donostia International Physics Center(DIPC) Donostia/San-Sebastián 20018Spain. Institute of Materials Ecole Polytechnique Federale de Lausanne1015 LausanneSwitzerland. Department of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia. Laboratory of Advanced Functional Materials Yerevan State UniversityYerevan 0025Armenia. National Graphene Institute(NGI) University of ManchesterManchester M139PLUK. Department of Materials Science and Engineering National University of SingaporeSingapore 03-09 EASingapore. Institute for Functional Intelligent Materials National University of Singapore117544 SingaporeSingapore

The emergence of van der Waals(vdW)materials resulted in the discovery of their high optical,mechanical,and electronic anisotropic properties,immediately enabling countless novel phenomena and *** success inspired an intensive search for the highest possible anisotropic properties among vdW ***,the identification of the most promising among the huge family of vdW materials is a challenging quest requiring innovative ***,we suggest an easy-to-use method for such a survey based on the crystallographic geometrical perspective of vdW materials followed by their optical *** our approach,we found As2S3 as a highly anisotropic vdW *** demonstrates high in-plane optical anisotropy that is~20%larger than for rutile and over two times as large as calcite,high refractive index,and transparency in the visible range,overcoming the century-long record set by *** these benefits,As2S3 opens a pathway towards nextgeneration nanophotonics as demonstrated by an ultrathin true zero-order quarter-wave plate that combines classical and the Fabry–Pérot optical phase ***,our approach provides an effective and easy-to-use method to find vdW materials with the utmost anisotropic properties.

关键词： anisotropy anisotropic high

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Pulsed THz radiation under ultrafast optical discharge of vacuum photodiode

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Frontiers of Optoelectronics 2024年第2期 100-113页

作者： Aleksandr A.Ushakov Kseniia A.Mamaeva Leonid V.Seleznev georgy E.Rizaev Vladimir Bukin Timophey V.Dolmatov Pavel A.Chizhov Vladimir 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 vacuum 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 have been provided. Spectral and polarization characteristics of generated terahertz pulses have also been studied. The proposed semi-analytical model and simulations in COMSOL Multiphysics prove the experimental data and allow for the optimization of experimental conditions aimed at flexible control of radiation parameters.

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Energy recovery of solid waste disposal in Russia,State of the Art and operation experience

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Waste Disposal and Sustainable Energy 2020年第4期2卷 265-273页

作者： georgy Ryabov Andrey Tugov All-Russia Thermal Engineering Institute MoscowRussia

For Russia,there is no alternative way of a civilized solution to the problem of municipal solid wastes(MSW):through combustion(energy utilization)to complex *** government of the Russian Federation in 2017 adopted some decisions aimed at thermal processing of *** order defines the construction of renewable energy facilities on the basis of MSW with a total electric capacity of 280 MW in Moscow region and one object with an electric capacity of 55 MW in the Republic of *** Russia,only three plants where the energy potential of MSW is converted into electricity were *** results of the operation experience of fluidized bed furnaces for MSW incineration at Rudnevo plant in Russia are *** main problems were connected with ash properties,deposit formation,and corrosion of superheater ***,the data of mathematical modeling of dynamic behavior near gas burners,chemical composition and material balance of solids,and the influence of secondary air injection on NOx formation are given.A special test rig was designed for the investigation of the corrosion ***,the main corrosion factors(temperature of the tube surface,rates of O_(2),HCl,SO_(2),and H_(2)O in flue gas,contains chloride and alkali metals in deposits)were found during the *** of energy recovery from waste incineration of pulp and paper mill plants is *** attention is paid to improv-ing the efficiency of waste incineration and bed particle *** experiments were carried out to optimize the bed drain flow *** influence of secondary air supply improvement on mixing with the main flow and boiler efficiency is ***-empirical three-zone method of engineering heat calculations for fluidized bed furnaces of biomass boilers was proposed to predict both the value of outlet furnace temperature and the value of fluidized bed *** method based on empirical values and relationships of the share of heat releas

关键词： Solid wastes Energy recovery Fluidized bed Agglomeration Deposit formation Corrosion Heat and mass balance

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Huber's Minimax Approach in Distribution Classes with Bounded Variances and Subranges with Applications to Robust Detection of Signals

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Acta Mathematicae Applicatae Sinica 2005年第2期21卷 269-284页

作者： georgy Shevlyakov Kiseon Kim Department of Information and Communications Gwangju Institute of Science and Technology(GIST) Oryongdong Buk-gu Gwangju 500-712 Republic of KoreaDepartment of Information and Communications Gwangju Institute of Science and Technology(GIST) Oryongdong Buk-gu Gwangju 500-712 Republic of Korea

A brief survey of former and recent results on Hubers minimax approach inrobust statistics is given. The least informative distributions minimizing Fisher information forlocation over several distribution classes with upper-bounded variances and subranges are writtendown. These least informative distributions are qualitatively different from classical Huberssolution and have the following common structure: (i) with relatively small variances they areshort-tailed, in particular normal; (ii) with relatively large variances they are heavy-tailed, inparticular the Laplace; (iii) they are compromise with relatively moderate variances. These resultsallow to raise the efficiency of minimax robust procedures retaining high stability as compared toclassical Hubers procedure for contaminated normal populations. In application to signal detectionproblems, the proposed minimax detection rule has proved to be robust and close to Hubers forheavy-tailed distributions and more efficient than Hubers for short-tailed ones both in asymptoticsand on finite samples.

关键词： Robustness least informative distributions

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The left-right side-specific endocrine signaling:implications for neurological deficits in stroke and neurodevelopmental disorders

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Neural Regeneration Research 2022年第11期17卷 2431-2433页

作者： georgy Bakalkin Nikolay Lukoyanov Igor Lavrov Mengliang Zhang Department of Pharmaceutical Biosciences Uppsala University Departamento de Biomedicina da Faculdade de Medicina da Universidade do Porto Instituto de Investiga??o e Inova??o em SaúdeInstituto de Biologia Molecular e Celular Department of Neurology Mayo Clinic Department of Molecular Medicine University of Southern Denmark

Brain injury-induced neurological deficits typically develop on the contralateral side of the body and include abnormal posture,motor weakness,and *** is believed that the interruption of descending neural pathways th... 详细信息

关键词： neurological typically deficit

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