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Textures and melt-crystal-gas interactions in granites

Geoscience Frontiers 2015年第5期6卷 635-663页

作者： jean.louis Vigneresse GeoRessources UMR 7339Universite de Lorraine

Felsic intrusions present ubiquitous *** result from the differential interactions between the magma components(crystal,melt,gas phase) while it flows or when the flow is perturbed by a new magma *** most obvious structure consists in fabrics caused by the interactions of rotating grains in a flowing viscous *** magma inputs through dikes affect the buk massif flow,considered as global within each mineral facies.A review of the deformation and flow types developing in a magma chamber identifis the patterns that could be *** determines their controlling parameters and summarizes the tools for their ***,a brief review of the theology of a complex multiphase magma identifies and suggests interactions between the different *** specific responses each component presents lead to instability *** particular,the change in vorticity orientation,associated with the switch between monoclinic to triclinic flow is a cause of many *** are preferentially *** include fabric development,shear zones and flow *** depend of the underlying rheology of interacting ***,enclaves,schlieren and ladder dikes result from the interactions between the magma components and changing boundary ***,pegmatites,unidirectional solidification textures and miarolitic cavities result from the interaction of the melt with a gaseous *** illustrations examine what is relevant to the bulk flow,local structures or boundary *** each case a field observation illustrates the *** discussion reformulates instability observations,suggesting new trails for ther description and interpretation in terms of local departure to a bulk flow.A brief look at larger structures and at their evolution tries to relate these instabilities on a broader *** helical structures of the Ricany pluton,Czech Republic and by the multiple granitic intrusions of Dolbe

关键词： Granitic magma Instabilities Triclinic flow Struct

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Addressing ore formation and exploration

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Geoscience Frontiers 2019年第4期10卷 1613-1622页

作者： jean.louis Vigneresse GéoRessources UMR 7339Université de Lorraine

Common base and noble metals represent an important economic factor in the actual industrial *** instance the world resources for copper are actually estimated for about the next 30 years *** situation requires rethinking the way major ore deposits form,leading to new guides for *** present paper briefly examines the processes leading to ore formation,in relation with granitic or granodioritic *** identifies the importance of metal enrichment during the magmatic *** the magma chamber that forms porphyry intrusions,metals may incorporate to first formed crystals,becoming inert;concentrate into the residual melt of a mush;or segregate by diffusion into the exsolved magmatic volatile phase(MVP)into which they are transported and precipitated.A competition results between elements partitioning and ***,a specific Peclet number for each metal(Cu,Au,Ag,Mo,W,Sn,and REE)controls the ratio between the diffusive and the advective *** diffusivity in the melt shows differential behavior relative to a threshold of about10 13 m2/*** with slower diffusivity values(***)will not ***,fast diffusive metals(Au,Ag,Cu)may rapidly incorporate the MVP,provided an adequate component(halogens or S)is attractive for *** chemistry of the MVP escaping the magma induces different alteration *** relative content in F,Cl or S,attested by the composition of biotites and apatites,links with the preferential content of metals in o re deposits,representing a valuable tool for *** the model is replaced in a set of coupled mechanical-chemical instabilities,within a three phase material.

关键词： Porphyry ore deposits Metals concentration processes Exploration Alteration pattern

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Phase coexistence properties of liquid mercury:a simulation study

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Rare Metals 2006年第5期25卷 567-571页

作者： jean.louis Bretonnet jean-Marc Bomont Laboratoire de Physique des Milieux Denses Université Paul Verlaine1bd F.D.Arago57078 MetzCedex 3France

The thermophysical properties of expanded liquid mercury have been investigated along the liquid-vapor coexistence curve by using Monte Carlo and Molecular Dynamic simulations. For the purpose, an empirical state dependent interatomic potential for the region of dense metallic liquid is used, while the state dependence is not necessary near the cliffcal point. In order to test the validity of this potential, we determine the surface layering and the sound velocity, two properties very sensitive to the choice of the potential. Our results are in quite good agreement with other theoretical results and to the experimental data available in the literature.

关键词： mercury simulation phase coexistence liquid state

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Rainfall and Temperature Variations over Burkina Faso: Possible Influence of Geomagnetic Activity, Solar Activity and Associated Energies from 1975 to 2020

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Atmospheric and Climate Sciences 2022年第4期12卷 603-612页

作者： Yacouba Sawadogo Somaïla Koala jean.louis zerbo Laboratoire de Matériaux d’Héliophysique et Environnement (La.M.H.E) Université Nazi Boni Bobo-Dioulasso Burkina Faso Unité de Formation et de Recherche en Sciences Exactes et Appliquées (UFR/SEA) Université Nazi Boni Bobo-Dioulasso Burkina Faso

This study investigates climatic parameters (rainfall, and temperature) over Burkina Faso and the possible role of solar activity and its induced energies. Through morphological investigations, we analyzed solar activity indices (sunspot number, IMF, PC index, Cosmic rays) over the last three solar cycles (1975-2020). Results about interplanetary heating show that joule heating is well correlated with the dynamic pressure of the solar plasma. Climate parameters (rainfall, Temperature) variabilities are modulated by disturbances in solar activity: 1) quiet solar characterized by a drop in solar plasma’s parameters is associated with important cloud cover and consequently bring important rainfall which chills terrestrial atmosphere, 2) active solar characterized by important input energy is associated with weak incident cosmic ray consequently with low cloudiness which brings warming. Thus, the possible natural link can be suggested between solar activity and climatic parameters even if it is not the only factor of global warming.

关键词： Temperature Rainfall Solar Activity Geomagnetic Activity Climate Burkina Faso

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Seasonal Variations of Solar Wind Parameters during Solar Cycles 23 and 24

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Open Journal of Applied Sciences 2022年第9期12卷 1527-1546页

作者： Somaïla Koala Yacouba Sawadogo jean.louis zerbo Laboratoire de Matériaux d’Héliophysique et Environnement (La.M.H.E) ED/ST Université Nazi BONI Bobo-Dioulasso Burkina Faso Unité de Formation et de Recherche en Sciences Exactes et Appliquées (UFR/SEA) Université Nazi BONI Bobo-Dioulasso Burkina Faso

In this paper, we analyzed diurnal and annual seasonal variations of solar wind parameters such as interplanetary magnetic field (IMF), proton density (N), solar wind speed (V) and solar wind dynamic pressure (Pdym), during the solar cycles 23 and 24. Our study shows that strong geomagnetic disturbances are observed at the equinoxes during both solar cycles. The highest proton densities are observed at solstices during both solar cycles. The greatest solar wind speeds are observed at the equinoxes of solar cycle 23 and at the solstices of solar cycle 24. The highest solar wind dynamic pressures are observed at the solstices of both solar cycles. We also observed an asymmetrical evolution of the seasonal diurnal values of the solar wind parameters during the two cycles, except for the proton density. Our investigations also highlight the fact that the seasonal diurnal values of the solar wind parameters are significant at solar cycle 23 compared to solar cycle 24 characterized by a global weak in solar plasma conditions since the deep minimum that followed the solar cycle 23 leading to an absence of a persistent polar coronal hole. The drop observed in polar field and solar winds parameters during solar cycle 24 is reproduced on seasons (solstices and equinoxes). The solar cycle 23 and 24 appear to be two magnetically opposite solar cycles regardless the time scales.

关键词： Diurnal Seasonal Solar Winds Parameters Variation Solar Cycle

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Homogenization of Hyperbolic Damped Stochastic Wave Equations

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Acta Mathematica Sinica,English Series 2018年第2期34卷 233-254页

作者： Aurelien FOUETIO jean.louis WOUKENG Department of Mathematics and Computer Science University of Dschang P.O. Box 67 Dschang Cameroon Interdisciplinary Center for Scientific Computing ( IWR) University of Heidelberg Im Neuenheimer Feld 205 69120 Heidelberg Germany

For a family of linear hyperbolic damped stochastic wave equations with rapidly oscillating coefficients, we establish the homogenization result by using the sigma-convergence method. This is achieved under an abstrac... 详细信息

关键词： Algebras with mean value stochastic hyperbolic partial differential equations Wiener process sigma-convergence

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Statistical Study of the Geoeffectivity of Halo Coronal Mass Ejections Associated with X-Class Flares during Solar Cycles 23 and 24

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Open Journal of Applied Sciences 2024年第4期14卷 950-960页

作者： Younoussa Diakite Christian Zoundi M’Bi Kabore jean.louis zerbo Laboratoire de Chimie Analytique de Physique Spatiale et Energ&#233tique (L@CAPSE) Physics Department Universit&#233 Norbert Zongo Koudougou Burkina Faso Laboratoire de Maté riaux d&#8217H&#233liophysique et Environnement (LAMHE) Physics Department Universit&#233 Nazi Boni Bobo-Dioulasso Burkina Faso

By analysing a long series of data (1996-2019), we show that solar cycle 23 was more marked by violent solar flares and coronal mass ejections (CMEs) compared to solar cycle 24. In particular, the halo coronal mass ejections associated with X-class flares appear to be among the most energetic events in solar activity given the size of the flares, the speed of the CMEs and the intense geomagnetic storms they produce. Out of eighty-six (86) X-class halo CMEs, thirty-seven (37) or 43% are highly geoeffective;twenty-four (24) or approximately 28% are moderately geoeffective and twenty-five (25) or 29% are not geoeffective. Over the two solar cycles (1996 to 2019), 71% of storms were geoeffective and 29% were not. For solar cycle 23, about 78% of storms were geoeffective, while for solar cycle 24, about 56% were geoeffective. For the statistical study based on speed, 85 halo CMEs associated with X-class flares were selected because the CME of 6 December 2006 has no recorded speed value. For both solar cycles, 75.29% of the halo CMEs associated with X-class flares have a speed greater than 1000 km/s. The study showed that 42.18% of halo (X) CMEs with speeds above 1000 km/s could cause intense geomagnetic disturbances. These results show the contribution (in terms of speed) of each class of halo (X) CMEs to the perturbation of the Earth’s magnetic field. Coronal mass ejections then become one of the key indicators of solar activity, especially as they affect the Earth.

关键词： CME Halo (X) Geoeffectivity Geomagnetic Storm Solar Flare Solar Cycle

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MULTISCALE HOMOGENIZATION OF NONLINEAR HYPERBOLIC EQUATIONS WITH SEVERAL TIME SCALES

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Acta Mathematica Scientia 2011年第3期31卷 843-856页

作者： jean.louis Woukeng David Dongo Department of Mathematics and Computer Science Faculty of Science University of Dschang

We study the multiscale homogenization of a nonlinear hyperbolic equation in a periodic *** obtain an accurate homogenization *** also show that as the nonlinear term depends on the microscopic time variable,the global homogenized problem thus obtained is a system consisting of two hyperbolic *** is also shown that in spite of the presence of several time scales,the global homogenized problem is not a reiterated one.

关键词： hyperbolic multiscale nonlinear

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Annual and Diurnal Variabilities in the Critical Frequency (foF2) during Geomagnetic Fluctuating Activity over Solar Cycles 21 and 22 at Ouagadougou

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Atmospheric and Climate Sciences 2018年第4期8卷 435-445页

作者： Abidina Diabaté Frédéric Ouattara jean.louis zerbo Laboratoire de Recherche en Energétique et Météorologie de l’Espace (LAREME) Université Norbert Zongo Koudougou Burkina Faso Université Nazi Boni Bobo Dioulasso Burkina Faso Laboratoire d’Energies Thermiques Renouvelables (L.E.T.RE) Université Ouaga 1 Pr Joseph Ki-Zerbo Ouagadougou Burkina Faso

Geomagnetic activity is characterized by four solar wind conditions. Each condition has specific impact on ionosphere. This paper review on fluctuating activity effects on ionosphere F2 layer through its critical frequency foF2 variations. Under fluctuating wind conditions, we have investigated on annual, diurnal and seasonal variations of foF2 during solar cycles 21 and 22 phases covered by Ouagadougou ionosonde station data (Lat: 12.5°N;Long: 358.5°E;dip: 1.43°). Our investigations show that foF2 annual’ variability is in phase with solar cycle. The diurnal variation is “noon bite out” most of the time except for the solar maximum where we have a morning peak testifying to the fact that the vertical drift E × B is disturbed. The seasonal variations show that the fluctuating activity has no particular effect on certain characteristics of the equatorial ionosphere such as electrojet and vertical drift E × B. However, the increase of the electric field pre-reversal phenomenon in autumn is a characteristic effect observed during the fluctuating activity.

关键词： Critical Frequency Solar Cycle Seasonal Diurnal Fluctuating Activity

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Multiscale Analysis of Semilinear Damped Stochastic Wave Equations

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Acta Mathematica Sinica,English Series 2023年第7期39卷 1305-1331页

作者： Aurelien FOUETIO Gabriel NGUETSENG jean.louis WOUKENG Department of Mathematics Higher Teacher Training CollegeUniversity of NgaoundereP.O.Box 652BertouaCameroon Department of Mathematics University of Yaounde IP.O.Box 812YaoundeCameroon Department of Mathematics and Computer Science University of DschangP.O.Box 67DschangCameroon

In this paper we proceed with the multiscale analysis of semilinear damped stochastic wave motions. The analysis is made by combining the well-known sigma convergence method with its stochastic counterpart, associated to some compactness results such as the Prokhorov and Skorokhod theorems. We derive the equivalent model, which is of the same type as the micro-model. One of the novelties of the work is that the corrector problem is solved in the classical sense of distributions,thereby allowing numerical computations of the homogenized coefficients.

关键词： Hyperbolic stochastic equations Wiener Process sigma convergence tightness of probability measures

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