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THE BUZZ

城市漫步（GBA版） 2020年第10期 10-11页

作者： faye Wong 不详

Legendary C-pop songstress faye Wong made the news last month after singing a duet with Alibaba founder Jack Ma on Wong's live broadcast(which are rare).The duo performed the emotional 1996 song'If the Cloud Knows'.

关键词： emotional Cloud rare

Contribution of Sentinel-2/Landsat-8 OLI Images to Extracting Vegetation Cover and Wetlands Area in Urban Zones: Case of the Dakar Region (Senegal)

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Journal of Geographic Information System 2021年第4期13卷 523-537页

作者： Dome Tine Gayane faye Omar Marico Modou Mbaye Landing Biaye Mbagnick faye Guilgane faye Département de Géographie Chercheur Associé au Laboratoire de Télédétection Appliquée (LTA) Institut des Sciences de la Terre (IST) Université Cheikh Anta DIOP de Dakar Dakar Sénégal Laboratoire de Télédétection Appliquée (LTA) Institut des Sciences de la Terre (IST) Université Cheikh Anta DIOP de Dakar Dakar Sénégal Département de Géographie Cheikh Anta DIOP University of Dakar Dakar Sénégal

Urban areas house vegetation cover in several forms, fulfilling several ecological functions like thermal regulator, biodiversity, air quality, etc. However, their extent is often not very well known, especially in African cities, making it sometimes difficult to assess their real impact on the urban ecosystem functioning. This work aims to analyse the capacity of satellite sensors for mapping vegetation and wetlands in urban areas. The data produced by the MSI sensors of Sentinel 2 and OLI of Landsat-8 are used to identify and map the vegetation cover in the Dakar region through a supervised classification with the Support Vector Machine (SVM) algorithm. The results show that it is sometimes not very easy to analyse urban vegetation with high spatial resolution images (HRS) resulting from the configuration of the vegetation in an urban environment, sometimes characterized by isolated trees or small green spaces. This explains why Sentinel-2 data which spatial resolution of 10 meters gives a better result compared to Landsat-8 data which is 30 meters. However, a good rendering is noted for the vegetation around the wetlands area for the two sensors resulting from the high density and the size of the vegetated perimeters in this part of the capital. Overall, there is an underestimation of urban vegetation cover, particularly for Landsat-8. The use of very high spatial resolution images could be necessary to better assess the potential of satellite data for monitoring urban vegetation in Sahelian context.

关键词： Remote Sensing Urban Area Vegetation Wetland Area Dakar

Factors Predisposing and Triggering the Phenomenon of Shrinkage-Swelling of Clay Soils in the Urban Center of Diamniadio

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Geomaterials 2023年第2期13卷 23-34页

作者： Khadim faye Fatou Samb Pape Sanou faye Yves Berthaud Laboratoire de Mécanique et Modélisation UFR Sciences de l’Ingénieur UIDT Thiès Sénégal UFR Sciences et Technologies Université Iba Der Thiam de Thiès Thiès Sénégal

The phenomena of shrinkage and swelling of clay induce damage to housing structures every year. Precipitation, climatic changes and drought are the cause of wall cracks due to subsidence or swelling of the supporting soil. This movement alters the balance between the soil and the structures. To explain this defection, the soil is made up of three elements: the solid, the liquid and the gas. Sometimes in a natural way or following a human intervention, one of these elements undergoes an abnormal variation that causes the loss of the balance between land and works. It is in this sense that this article deals on the one hand with the factors of predisposition and triggering of the phenomena of shrinkage-swelling of the clay soils of Diamniadio and on the other hand, the factors of aggravation linked to the lithological heterogeneity and the variation in the thickness of the layers susceptible to shrinkage-swelling. The studies carried out have enabled a deeper understanding of the behavior of expansive soils following their interactions with climate, vegetation, hydrology, hydrogeology, constructions among others, but also the influence of lateral and vertical variations of fine soil facies.

关键词： Swelling Clays Expansive Soil Shrinkage-Swelling Desiccation Cracks Diamniadio

Study and Comparison of Swelling and Compressibility Characteristics of Crumb Marl, Flaky Marl with Attapulgite and Sandy Clay from the Diamniadio Urban Pole at the Oedometer

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Geomaterials 2023年第3期13卷 61-70页

作者： Khadim faye Fatou Samb Yves Berthaud Pape Sanou faye Laboratoire de Mécanique et Modélisation UFR Sciences de l'Ingénieur UIDT Thiès Sénégal UFR Sciences et Technologies Université Iba Der Thiam de Thiès Sénégal

In Senegal, the Diamniadio, Sebikhotane and Bargny sector contains clay soils that are problematic for construction. In order to have more information on the behavior of the clay soils of Diamniadio, free swelling tests followed by load-discharge cycles were carried out according to standard NF P 94-090-1. These tests were carried out using an Oedometric device on the three samples from the study site (sandy clays with calcareous concretion, marls with crumbs and laminated marls with attapulgite) to apprehend their swelling aspects in saturated conditions. For the free swelling test, a determination of the different swelling phases will be carried out followed by a comparison of the rate of evolution of the phases for the three samples from the site. In the same vein, the compressibility characteristics of the samples will also be provided from load-unload Oedometric tests. Thereafter, we proceed to a comparison of the void index at the initial state of the samples after two charge-discharge cycles and the influence of the cycles on the reorganization of the internal structure of the samples. These studies will provide more information on the swelling behavior of Diamniadio soils in the presence of water.

关键词： Clay Swelling Expansive Soil Evolution of The Swelling Compressibility Coefficient Charge-Discharge Cycle

Choice of Site for the Installation of Photovoltaic Solar Power Plants in Senegal: Consequences on Electricity Production

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Journal of Power and Energy Engineering 2017年第12期5卷 109-118页

作者： Mactar faye Ababacar Thiam Efficiency and Energetic Systems Research Group Alioune Diop University Bambey Senegal Laboratoire d’Energétique Appliquée Ecole Supérieure Polytechnique Université Cheikh Anta Diop Dakar Senegal

A theoretical analysis of the electricity production of a photovoltaic solar power plant of 22 MW for different sites in Senegal is presented. The study is carried out in two coastal regions (Dakar and Saint-Louis) and two continental regions (Mbacké and Linguère). This study is done using the RET Screen clean energy project management software climate data. The amount of electricity exported to the grid is calculated for each site. The results show that the climatic conditions of the coastal and continental regions are different from November to June. From July to October, which corresponds to the rainy season in Senegal, the climatic conditions of the coastal and continental regions are similar. The results also show that although the efficiency of photovoltaic modules is better on the coast, electricity production varies little from one site to another. Climate conditions in Senegal therefore have no impact on electricity production.

关键词： Photovoltaic Solar Power Plant Climatic Conditions Electricity Production Coastal Zone Continental Zone

An efficient hybrid protection scheme with shared/dedicated backup paths on elastic optical networks

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Digital Communications and Networks 2017年第1期3卷 11-18页

作者： Nogbou G. Anoh Michel Babri Ahmed D. Kora Roger M. faye Boko Aka Claude Lishou LMI Universite Nangui Abrogoua Abidjan Cote d'Ivoire LARIT Institut National Polytechnique Felix Houphouet Boigny Abidjan Cote d'Ivoire LTI Eeole Superieure Polytechnique Universite Cheikh Anta Diop Dakar Senegal Ecole Superieure Multinationale des Teleommunications Dakar Senegal

Fast recovery and minimum utilization of resources are the two main criteria for determining the protection scheme quality. We address the problem of providing a hybrid protection approach on elastic optical networks under contiguity and continuity of available spectrum constraints. Two main hypotheses are used in this paper for backup paths computation. In the first case, it is assumed that backup paths resources are dedicated. In the second case, the assumption is that backup paths resources are available shared resources. The objective of the study is to minimize spectrum utilization to reduce blocking probability on a network. For this purpose, an efficient survivable Hybrid Protection Lightpath （HybPL） algorithm is proposed for providing shared or dedicated backup path protection based on the efficient energy calculation and resource availability. Traditional First-Fit and Best-Fit schemes are employed to search and assign the available spectrum resources. The simulation results show that HybPL presents better performance in terms of blocking probability, compared with the Minimum Resources Utilization Dedicated Protection （MRU-DP） algorithm which offers better performance than the Dedicated Protection （DP） algorithm.

关键词： Hybrid protectionElastic Optical NetworksBackup shared resourcesEfficient energy costMinimum resource utilizationModulation format

Microfacies and Depositional Environments of Miocene Isolated Carbonate Platforms from Central Luconia, Offshore Sarawak, Malaysia

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Acta Geologica Sinica(English Edition) 2017年第5期91卷 1778-1796页

作者： Hammad Tariq JANJUHAH José Antonio GáMEZ VINTANED Ahmed Mohamed Ahmed SALIM Ibrahima faye Mumtaz Muhammad SHAH Deva Prasad GHOSH SEACARL Department of Geoscience University Technology PETRONAS Perak Malaysia 32610 Department of Geoscience University Technology PETRONAS Perak Malaysia 32610 Department of Fundamental and Applied Science University Technology PETRONAS Perak Malaysia 32610 Department of Earth Science Quaid-i-Azam UniversityIslamabad Pakistan 45320 CoE in CSIf Department of Geoscience University Technology PETRONAS Perak Malaysia 32610

The Luconia Province-offshore Sarawak-is a key geological unit for understanding the distribution of hydrocarbon resources in Malaysia. Nevertheless, little effort has been made to address the palaeoenvironmental characteristics of the Tertiary carbonates in the key sector of Central *** study the sedimentology and petrography of core samples from a well in Central Luconia, for which thirteen microfacies have been identified reflecting different depositional settings. This is the first microfacies scheme elaborated for Luconian carbonates. Lithofacies and microfacies distribution are compatible with deposition in a reef complex, originating around a framework reef, within the euphotic zone. Sediments were deposited in environments of backreef, reef crest, and forereef. The fair weather wave base is marked by the presence of coralline red algae, foraminifera, decreasing degree of bioclast fragmentation and other microfacies features. As a result, a depositional-environmental model is constructed, depicting a reef complex built around a framework reef developed on the margin of an isolated platform. In addition, an innovative, preliminary time series analysis of facies, microfacies and depositional environment data reveal the existence of seasonal cycles in the stacking patterns of facies and microfacies.

关键词： central Luconia sedimentology microfacies reef complex depositional environments time series

Introduction of monkeypox virus in Benin,2022

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Military Medical Research 2023年第4期10卷 572-574页

作者： Anges Yadouleton Martin faye Carine Tchibozo Mariam Oke Oumar faye Thierry Lawale Eric Denon RenéKeke Ange Dossou Alban Zohoun Francis Dossou Moussa Moise Diagne Sourakou Salifou Khadija Leila Diatta Mignane Ndiaye Safietou Sankhe Amadou Diallo Sonia Bedie Clément Glele-Kakai Al Fattah Onifade Raoul Saizonou Gildas Hounkanrin Olga Quenum Yvette Badou Benjamin Hounkpatin Amadou Alpha Sall Ousmane faye Laboratoire des Fièvres Hémorragiques Virales(LFHV) Ministry of Health of Benin01-882CotonouBenin Ecole Normale Supérieure de Natitingou UniversitéNationale des SciencesTechnologiesIngénierie et Mathématiques(UNSTIM)2282GohoAbomeyCotonouBenin Virology Department Institut Pasteur de Dakar36 Avenue Pasteur220DakarSenegal Ministry of Health of Benin 01-882CotonouBenin National Public Health Laboratory Ministry of Health of Benin01-882CotonouBenin Epidemiology Clinical Research and Data Science DepartmentInstitut Pasteur de Dakar220DakarSenegal WHO Country Office in Benin Avenue CENSAD-Les Cocotiers01BP 918CotonouBenin

Dear Editor,Monkeypox is an infectious disease that is endemic in a dozen of African *** imported cases have been also reported outside of Africa in the past[1].Since early May 2022,monkeypox infections including human-to-human transmission,were reported in a multi-country outbreak in non-endemic countries and declared Public Health Emergency of International Concern(PHEIC)by the World Health Organization(WHO)in July 2022[2].As of 20 September 2022,a total of at least 62,798 human cases of monkeypox with 20 deaths have been confirmed in 115 countries in five WHO regions[3].

关键词： Monkeypox virus Introduction Human-to-human transmission Benin

Redox flow batteries-Concepts and chemistries for cost-effective energy storage

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Frontiers in Energy 2018年第2期12卷 198-224页

作者： Matthaa Verena HOLLAND-CUNZ faye CORDING Jochen FRIEDL Ulrich STIMMING Chemistry-School of Natural and Environmental Sciences Newcastle University Newcastle upon Tyne NE1 7RU United Kingdom

Electrochemical energy storage is one of the few options to store the energy from intermittent renewable energy sources like wind and solar. Redox flow batteries （RFBs） are such an energy storage system, which has favorable features over other battery technologies, e.g. solid state batteries, due to their inherent safety and the independent scaling of energy and power content. However, because of their low energy-density, low powerdensity, and the cost of components such as redox species and membranes, commercialised RFB systems like the all- vanadium chemistry cannot make full use of the inherent advantages over other systems. In principle, there are three pathways to improve RFBs and to make them viable for large scale application： First, to employ electrolytes with higher energy density. This goal can be achieved by increasing the concentration of redox species, employing redox species that store more than one electron or by increasing the cell voltage. Second, to enhance the power output of the battery cells by using high kinetic redox species, increasing the cell voltage, implementing novel cell designs or membranes with lower resistance. The first two means reduce the electrode surface area needed to supply a certain power output, thereby bringing down costs for expensive components such as membranes. Third, to reduce the costs of single or multiple components such as redox species or membranes. To achieve these objectives it is necessary to develop new battery chemistries and cell configurations. In this review, a comparison of promising cell chemistries is focused on, be they all-liquid, slurries or hybrids combining liquid, gas and solid phases. The aim is to elucidate which redox-system is most favorable in terms of energy-density, power-density and capital cost. Besides, the choice of solvent and the selection of an inorganic or organic redox couples with the entailing consequences are discussed.

关键词： electrochemical energy storage redox flow battery vanadium