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Petrographic and geochemical characterization of weathered materials developed on BIF from the Mamelles iron ore deposit in the Nyong unit, South-West Cameroon

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Acta Geochimica 2021年第2期40卷 163-175页

作者： Tessontsap Teutsong jean pierre Temga Armelle Ayissi Enyegue Nicodeme Noel Feuwo Dieudonne Bitom Department of Earth Sciences University of Yaounde IP.O.Box 812YaoundeCameroon Ministry of Mines Industry and Technological DevelopmentYaoundeCameroon University of Dschang P.O.Box 96Dschang.Cameroon

Iron ore deposits hosted by Precambrian banded iron formation(BIF)are the most important source of mineable *** Cameroon,they are located in the southern part of the *** study reports the petrological and geochemical data of iron ores collected from a weathering profile in the Mamelles BIF deposit,SW *** profile is composed of three levels which are from the bottom to the top:the saprock,the ferruginous horizon,and the loose *** representative iron ore samples(rock fragments and loose clayey material)were collected along the profile and were subjected to petrographic and geochemical *** mineralogy consists of martite,goethite,quartz,and lesser amounts of hematite,magnetite,kaolinite,and *** presence of minerals such as kaolinite and goethite in the Mamelles iron ores suggests their supergene ***,the saprock is characterized by high iron content(70.25 wt%Fe_(2)O_(3) t),and low silica(26.38 wt%SiO_(2))and alumina(1.14 wt%Al_(2) O_(3)).The rock fragments collected from the ferruginous horizon display higher Fe2 O3 t(72-76.40 wt%),Al_(2) O_(3)(2.80-5.43 wt%),and lower SiO_(2)(16.70-18.35 wt%)contents,suggesting the leaching of silica during the enrichment *** loose clayey samples collected from both the ferruginous horizon and the upper loose horizon show lower iron and higher silica *** normalized to the underlying BIF saprock,both rock fragments and loose clayey ores display LREE enrichment,suggesting that they formed through supergene ***,most of the Mamelles iron ores are classified as medium-grade ores and a few display acceptable contents in ***,this petrological and geochemical study of the Mamelles iron ores revealed encouraging *** its strategic location near the deep seaport,the deposit should be investigated in more detail for its mining potential.

关键词： Mamelles BIF Medium-grade iron ore Supergene origin Nyong unit Cameroon

Guillain-Barrésyndrome following hepatitis E

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World Journal of Gastroenterology 2009年第13期15卷 1645-1647页

作者： jean Philippe Loly Estelle Rikir Maxime Seivert Emile Legros pierre Defrance Jacques Belaiche Gustave Moonen jean Delwaide Department of Hepato-Gastroenterology CHU Sart TilmanUniversitéde Liège Department of Neurology CHU Sart TilmanUniversitéde Liège General Practitioner Department of Hepato-Gastroenterology CHPLT La Tourelle

Guillain-Barrésyndrome(GBS)is often triggered by a preceding bacterial or viral ***,it has been observed in association with acute hepatitis A,B and C,and three cases have been previously described in India in which GBS was associated with acute hepatitis E.A molecular mimicry mechanism is supposed to be involved in the pathogenesis of GBS triggered by infectious agents,although the nature of the shared epitopes has not been characterized in most instances,including that in the case of hepatotropic *** report a case of GBS following acute hepatitis E in a European *** presence of antiganglioside GM2 antibodies in this patient suggested molecular mimicry involving ganglioside GM2 in the pathogenesis of GBS associated with hepatitis E.

关键词： Gangliosides Guillain-Barré syndrome Hepatitis E Molecular mimicry Viral hepatitis

Steric and electronic selectivity in the synthesis of Fe- 1,2,4,5-tetracyanobenzene （TCNB） complexes on Au（111）： From topological confinement to bond formation

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Nano Research 2014年第6期7卷 888-897页

作者： Shawulienu Kezilebieke Anis Amokrane Mauro Boero Sylvain Clai Mathieu Abel jean-pierre Bucher Institut de Physique et Chimie des Materiaux de Strasbourg CNRS UMR 7504 Universit~ de Strasbourg F-67034 Strasbourg France Universite Aix-Marseille IM2NP CNRS UMR 7334 Campus de Saint-Jereme Case 142 F- 13397 Marseille Cedex 20 France

A study of the surface assisted self-assembly of 1,2,4,5-tetracyanobenzene （TCNB） acceptor molecules and Fe atoms on an Au（111） surface is presented. While conditions to get the two-dimensional arrays of stable Fe（TCNB）4 complexes are clearly identified, ultrahigh vacuum scanning tunneling microscopy and spectroscopy （STM/STS） coupled with first-principles calculations reveals that situations may occur where Fe and TCNB survive on the surface （as Fe-4TCNB entities） at a higher density than the original molecular monolayer without forming coordination bonds with each other. It is found that the square planar coordination of the Fe（TCNB）4 monomer complexes cannot fully develop in the presence of lateral strain due to growth-induced confinement. A phenomenon similar to steric hindrance involving a strongly modified chirality with a Fe-N-C bond angle of 120° compared to the 180° for the stable complex may then explain why the Fe atom keeps its metallic bond with the surface. The competition between steric and electronic effects, not reported before, may arise elsewhere in surface chemistry involved in the synthesis of new and potentially useful organic nanomaterials.

关键词： scanning tunnelingspectroscopy STM self-assembly steric hindrance metal-organic coordination chirality nanochemistry surface state

New anticancer drugs in Europe

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Chinese Medical Journal 1997年第4期110卷 58-69页

作者： jean pierre Armand Department of Medicine Institute Gustave Roussy Vilejuif France

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ＮｅｗａｎｔｉｃａｎｃｅｒｄｒｕｇｓｉｎＥｕｒｏｐｅＪｅａｎＰｉｅｒｅＡｒｍａｎｄＦｏｒｔｈｅｎｅａｒｆｕｔｕｒｅ，ｓｙｓｔｅｍｉｃｃｈｅｍｏｔｈｅｒａｐｙｗｉｌｂｅｔｈｅｍａｉｎｓｔａｙｏｆｔｒｅａｔｍｅｎｔｉｎｍｅｔａｓｔａｔｉｃｃａｎｃｅｒ．Ｉ...

关键词： anticancer

Corrections to the scaling of the second-order structure function in isotropic turbulence

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Acta Mechanica Sinica 2010年第2期26卷 151-157页

作者： Le Fang Wouter J. T. Bos Xiaozhou Zhou Liang Shao jean-pierre Bertoglio Laboratoire de Mecanique des Fluides et d'Acoustique Universit6 de Lyon Ecole centrale de Lyon 69134 Ecully France Department of Mechanical Engineering Center for Biomedical Engineering Research University of Delaware 126 Spencer Laboratory Newark DE 19716 USA

The approach of Obukhov assuming a constant skewness was used to obtain analytical corrections to the scaling of the second order structure function, starting from Kolmogorov＇s 4/5 law. These corrections can be used in model applications in which explicit expressions, rather than numerical solutions are needed. The comparison with an interpolation formula proposed by Batchelor, showed that the latter gives surprisingly precise results. The modification of the same method to obtain analytical corrections to the scaling law, taking into account the possible corrections induced by intermittency, is also proposed.

关键词： Scaling law · Structure function ·Isotropic turbulence

Thinning effects on walnut stem and crown diameter growth and fruiting in the walnut-fruit forests of Kyrgyzstan

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Journal of Mountain Science 2016年第9期13卷 1558-1566页

作者： jean-pierre SORG Zora Lea URECH Davlet MAMADZHAN0V Maik REHNUS Groupe deforesterie pour le developpement Department of Environmental SciencesETH Zurich8092 ZurichSwitzerland HEL VETAS Swiss Intercooperation 3001 BerneSwitzerland Laboratory of Forest Resources Forest Research Institute720015 BishkekKyrgyzstan Swiss Federal Research Institute WSL Ziircherstrasse 1118903 BirmensdorfSwitzerland

The walnut-fruit forests （Juglans regia L.） in southern Kyrgyzstan are considered to be biodiversity hotspots and of considerable economic and ecological importance to local populations. The fruiting ability and stability of these forests are, however, decreasing because of infrequent silvicultural interventions and non-existent natural regeneration. Continuous inventories and walnut harvest measurements were carded out on 18 trial and control plots over the course of i3 year. Results showed that i） thinning had a positive influence on diameter at breast height （dbh） increase, ii） dbh growth and crown area increases are strongly and positively correlated, iii） large crowns enhanced the production of fruits, and iv） temperature conditions had a major influence on the production of fruits. The above-mentioned points are particularly relevant for young plantations but are also valid for relatively old plantations （〉 50 years）. We conclude that regular thinning substantially improves diameter growth, fruit production and ability of trees to withstand wind and snow damage in both young stands and in older walnut-fruit forests.

关键词： Juglans regia Silviculture Orchardmanagement Fruit harvest Nut production

A metadata model for collaborative experiments and simulations in earthquake engineering

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Frontiers of Structural and Civil Engineering 2010年第2期4卷 133-153页

作者： jean-pierre BARDET Fang LIU Nazila MOKAR Sonny Astani Department of Civil and Environmental Engineering University of Southern CaliforniaLos AngelesCA 90089-2531USA Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Geotechnical Engineering DepartmentTongji UniversityShanghai 200092China

Research projects in earthquake engineering yield a very large amount of complex data from experiments and computer *** and exchanging these complicated and voluminous data sets prompted the development of metadata models that document the processes of data generation,and facilitate the collaboration and exchange of information between *** present metadata model was designed to document and exchange a large number of large data files in earthquake engineering,but is applicable to other fields of engineering and *** model was conceived based on a series of former data models,which were unduly complicated and limited to few types of *** than its predecessors,the present metadata model applies to all kinds of earthquake engineering *** was developed in the object-oriented with examples from centrifuge experiments.

关键词： metadata data documentation experiment simulation

A versatile interferometric technique for probing the thermophysical properties of complex fluids

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Light(Science & Applications) 2022年第5期11卷 979-990页

作者： Gopal Verma Gyanendra Yadav Chaudry Sajed Saraj Longnan Li Nenad Miljkovic jean pierre Delville Wei Li GPL Photonics Lab State Key Laboratory of Applied OpticsChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences130033 ChangchunChina School of Physical Sciences University of LiverpoolLiverpool L693BXUK Materials Research Laboratory University of IllinoisUrbanaILUSA Department of Mechanical Science and Engineering University of IllinoisUrbanaILUSA Department of Electrical and Computer Engineering University of IllinoisUrbanaILUSA International Institute for Carbon Neutral Energy Research(WPI-I2CNER) Kyushu University744 MotookaNishi-kuFukuoka 819-0395Japan University of Bordeaux CNRSLOMAUMR 5798F-33405 TalenceFrance

Laser-induced thermocapillary deformation of liquid surfaces has emerged as a promising tool to precisely characterize the thermophysical properties of pure ***,challenges arise for nanofluid(NF)and soft biofluid systems where the direct interaction of the laser generates an intriguing interplay between heating,momentum,and scattering forces which can even damage soft ***,we report a versatile,pump-probe-based,rapid,and non-contact interferometric technique that resolves interface dynamics of complex fluids with the precision of~1 nm in thick-film and 150 pm in thin-film regimes below the thermal limit without the use of lock-in or modulated *** characterize the thermophysical properties of complex NF in three exclusively different types of ***,when the NF is heated from the bottom through an opaque substrate,we demonstrate that our methodology permits the measurement of thermophysical properties(viscosity,surface tension,and diffusivity)of complex NF and ***,in a top illumination configuration,we show a precise characterization of NF by quantitively isolating the competing forces,taking advantage of the different time scales of these ***,we show the measurement of NF confined in a metal cavity,in which the transient thermoelastic deformation of the metal surface provides the properties of the NF as well as thermo-mechanical properties of the *** results reveal how the dissipative nature of the heatwave allows us to investigate thick-film dynamics in the thin-film regime,thereby suggesting a general approach for precision measurements of complex NFs,biofluids,and optofluidic devices.

关键词： deformation thermophysical film

High demand for firewood leads to overuse of walnut-fruit forests in Kyrgyzstan

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Journal of Forestry Research 2013年第4期24卷 797-800页

作者： Maik Rehnus Annemarie Nazarek Davlet Mamadzhanov Bronislav Ivanovitch Venglovsky jean-pierre Sorg Groupe de foresterie pour le développement Department of Environmental SciencesETH Zurich Forest Research Institute Laboratory of forest resources Fund "Forest protection"

After Kyrgyzstan gained independence in 1991, the importance of the primary sector for food- and energy-supply increased significantly. This has led to a discussion about the sustainability of current firewood use. We investigated firewood collection and use practices in three selected villages and analysed differences between the annual increment of woody biomass and firewood consumption for heating during winter months. The calculated individual firewood consumption is on average 3.90 kg/capita/heating day and the calculation of differences between increment and consumption shows that in minimum one village the surrounding forests are overused for firewood collection. Pressure on the forest and the overuse of preferred tree species for firewood can lead to an overuse of the resource and to a decrease in the genetic diversity of these species in the walnut-fruit forests which are considered as a biodiversity hotspot of international significance due to the diversity of woody.

关键词： swalnut Juglans regia firewood consumption overexploitation