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作者： Medard edward 外交学院

学位级别：硕士

A vast amount of financing from China flows towards African countries. Considering theprioritization of regional integration schemes by African countries, of recent there has been adiscussion of China’s impact on regional integration in Africa, with particular notice–ingeneral–on how aid and external finance may be more effective for poverty alleviation anddevelopment in individual African countries if it is harmonized–across borders, betweencountries and between donors and external financiers working in–country. One waysuggested to achieve this, given the vast differences in environment and situations fromcountry to country in the continent, is to consider a continental or regional approach infinancing through each African Regional Economic Community （REC）. This would not onlystrengthen the negotiating positions of African governments, but also would ensure thatprojects have maximum impact in respective regions and countries. This paper will attempt toexplore the Chinese investment and financing in the East African Community （EAC）–as aregion, as opposed to such investment flowing towards individual member countries in thesame region.

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Power-Sharing Enhancement Using Harmonized Membership Fuzzy Logic Droop Control Based Micro-Grid

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Intelligent Automation & Soft Computing 2023年第5期36卷 1395-1415页

作者： W.J.Praiselin J.Belwin edward School of Electrical Engineering Vellore Institute of TechnologyVellore632014TamilnaduIndia

The contribution of Renewable Energy Resources(RER)in the process of power generation is signiﬁcantly high in the recent days since it paves the way for overcoming the issues like serious energy crisis and natural *** paper deals with the renewable energy based micro-grid as it is regarded as the apt solution for integrating the RER with the electrical *** theﬁxed droop coefﬁcients in conventional droop control approaches have caused various limitations like low power-sharing and sudden drops of grid voltage in the Direct Current(DC)side,the Harmonized Membership Fuzzy Logic(MFL)droop control is employed in this present *** proposed droop control for the hybrid PV-wind-battery system with MFL assists in achieving proper power-sharing and minimizing Total Harmonic Distortion(THD)in the emer-gency *** eradicates the deviations in voltage and frequency with itsﬂexible and robust *** THD is reduced and attains the value of 3.1%compared to the traditional droop *** simulation results of harmo-nized MFL droop control are analogized with the conventional approaches to vali-date the performance of the proposed *** addition,the experimental results provided by the Field Programmable Gate Array(FPGA)based laboratory setup built using a solar photovoltaic(PV)and wind Permanent Magnet Synchro-nous Generator(PMSG)reafﬁrms the design.

关键词： Micro-grid harmonized droop control fuzzy power-sharing total harmonic distortion

Weakly-and Semisupervised Probabilistic Segmentation and Quantification of Reverberation Artifacts

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Biomedical Engineering Frontiers 2022年第1期3卷 67-81页

作者： Alex Ling Yu Hung edward Chen John Galeotti Department of Biomedical Engineering Carnegie Mellon UniversityPittsburghPAUSA Robotics Institute Carnegie Mellon UniversityPittsburghPAUSA

Objective and Impact *** propose a weakly-and semisupervised,probabilistic needle-and-reverberation-artifact segmentation algorithm to separate the desired tissue-based pixel values from the superimposed *** method models the intensity decay of artifact intensities and is designed to minimize the human labeling *** image quality has continually been ***,when needles or other metallic objects are operating inside the tissue,the resulting reverberation artifacts can severely corrupt the surrounding image *** effects are challenging for existing computer vision algorithms for medical image *** reverberation artifacts can be hard to identify at times and affect various pixel values to different *** boundaries of such artifacts are ambiguous,leading to disagreement among human experts labeling the *** learning-based framework consists of three *** first part is a probabilistic segmentation network to generate the soft labels based on the human *** soft labels are input into the second part which is the transform function,where the training labels for the third part are *** third part outputs the final masks which quantifies the reverberation *** demonstrate the applicability of the approach and compare it against other segmentation *** method is capable of both differentiating between the reverberations from artifact-free patches and modeling the intensity fall-off in the *** method matches state-of-the-art artifact segmentation performance and sets a new standard in estimating the per-pixel contributions of artifact vs underlying anatomy,especially in the immediately adjacent regions between reverberation *** algorithm is also able to improve the performance of downstream image analysis algorithms.

关键词： image probabilistic anatomy

Sponge-based materials for oil spill cleanups: A review

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Frontiers of Chemical Science and Engineering 2020年第5期14卷 749-762页

作者： edward Mohamed Hadji Bo Fu Ayob Abebe Hafiz Muhammad Bilal Jingtao Wang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China College of chemical engineering Nanjing Forestry UniversityNanjing 210037China

Elimination of leaked oil from aquatic environs has recently gained importance owing to the disasters associated with leakages into marine *** need for an environmentally friendly and viable line of action concerning the environs has brought forward numerous affordable,non-toxic,and decomposable materials;further,diverse biomasses for fabricating nano-to micro-scale materials,membranes,and sponges/aerogels have also been incorporated for the elimination and retrieval of oils from ***,selectivity,sorption capacity,and reusability of these materials after the retrieval of oils are also desired from the viewpoint of *** review encompasses the recent progress in the field of elimination and retrieval of oil spills using various sponge-based materials.

关键词： membranes sponges reusability sorbents selectivity sorption capacity

All-optical dynamic focusing of light via coherent absorption in a plasmonic metasurface

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Light(Science & Applications) 2017年第1期6卷 114-120页

作者： Maria Papaioannou Eric Plum edward TF Rogers Nikolay I Zheludev Optoelectronics Research Centre and Centre for Photonic Metamaterials University of SouthamptonHighfieldSouthampton SO171BJUK Institute for Life Sciences University of SouthamptonHighfieldSouthampton SO171BJUK Centre for Disruptive Photonic Technologies School of Physical and Mathematical Sciences and The Photonics InstituteNanyang Technological UniversitySingapore 637371Singapore

Vision,microscopy,imaging,optical data projection and storage all depend on focusing of *** focusing is conventionally achieved with mechanically reconfigurable lenses,spatial light modulators or *** we demonstrate that dynamic control of focusing can be achieved through coherent interaction of optical waves on a thin beam *** use a nanostructured plasmonic metasurface of subwavelength thickness as the beam splitter,allowing operation in the regimes of coherent absorption and coherent *** of light resulting from illumination of the plasmonic metasurface with a Fresnel zone pattern is controlled by another patterned beam projected on the same *** altering the control pattern,its phase,or its intensity,we switch the lens function on and off,and alter the focal spot’s depth,diameter and *** occurs as fast as the control beam is modulated and therefore tens of gigahertz modulation bandwidth is possible with electro-optical modulators,which is orders of magnitude faster than conventional dynamic focusing technologies.

关键词： all-optical dynamic focusing coherent control coherent perfect absorption metasurfaces

Tendency and Fractal Pattern of Migration of Trace Elements in Source Rocks During Thermal Event

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Science China Chemistry 1994年第6期37卷 744-757页

作者：周永章 edward H. Chown Jayanta Guha 卢焕章 Institute of Geochemistry Guangzhou Branch Academia Sinica Guangzhou 510640 PRC Sciences Appliqées Uniersityé du Qubec a ChicoutimiCanada G7H2B1

The reactivation of trace elements in source rocks is fundamental in the formation of many economic deposits. Although transport by fluid flow and infiltration is very effective along visible fractures, the migration of trace elements from the inner part of solid cells to the weaknesses is much less efficient, and so becomes the bottleneck in the migration of these elements from their initial positions in the source rock to the final deposition site in an ore body. Diffusion may play a key role in the reactivation of trace elements. The overall migration pattern of trace elements in source rocks is characterized by an embedded sink mosaic structure, which possesses the self-similarity of a fractal. There are two general migration tendencies of trace elements. One is from within solid cells, such as mineral grains, toward the sink, consisting of weaknesses in the source rock. The other is from high-temperature fields toward low-temperature ones. High temperature favors the realization of these two tendencies. Conjugate geochemical anomalies are the inevitable result of a closed system.

关键词： migration trace element fractal embedded sink mosaic structure.

Effect of a fever in viral infections-the ‘Goldilocks’ phenomenon?

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World Journal of Clinical Cases 2021年第2期9卷 296-307页

作者： Lucas Belon Peter Skidmore Rohan Mehra edward Walter Department of Intensive Care Medicine Royal Surrey County HospitalGuildford GU27XXSurreyUnited Kingdom Department of General Medicine Royal Surrey County HospitalGuildford GU27XXSurreyUnited Kingdom

Acute infections,including those due to Coronaviridae and other viruses,often stimulate a febrile response.A mild fever appears to improve outcome;it appears to diminish viral replication by several mechanisms,including virion entry into host cells and genome transcription,and improving host defence mechanisms against the ***,a fever may also damage host cellular and tissue function and increase metabolic *** temperatures at the lower end of the febrile range,the benefit of the fever appears to outweigh the detrimental ***,at higher temperatures,the outcome worsens,suggesting that the disadvantages of fever on the host predominate.A non-infective fever is associated with a worse outcome at lower temperatures,suggesting that hyperthermia carries less benefit in the absence of *** review discusses the risks and benefits of a fever on the host response,focusing on the effects of a fever on viral replication and host response,and the detrimental effect on the host.

关键词： Fever Virus Coronavirus Infection Body temperature regulation Hyperthermia

The molecular basis of hypertrophic scars

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Burns & Trauma 2016年第1期4卷 1-12页

作者： Zhensen Zhu Jie Ding edward E.Tredget Wound Healing Research Group Division of Plastic and ReconstructiveSurgeryUniversity of AlbertaEdmontonAlbertaCanada Department of Burn and Reconstructive Surgery 2nd AffiliatedHospital of Shantou University Medical CollegeShantouGuangdongChina. Wound Healing Research Group Division of Plastic and ReconstructiveSurgeryUniversity of AlbertaEdmontonAlbertaCanada Wound Healing Research Group Division of Plastic and ReconstructiveSurgeryUniversity of AlbertaEdmontonAlbertaCanada Division of PlasticSurgery Department of SurgeryUniversity of AlbertaEdmontonAlbertaCanada.

Hypertrophic scars(HTS)are caused by dermal injuries such as trauma and burns to the deep dermis,which are red,raised,itchy and *** can cause cosmetic disfigurement or contractures if craniofacial areas or mobile region of the skin are *** wound healing with more extracellular matrix deposition than degradation will result in HTS *** review will introduce the physiology of wound healing,dermal HTS formation,treatment and difference with keloids in the skin,and it also review the current advance of molecular basis of HTS including the involvement of cytokines,growth factors,and macrophages via chemokine pathway,to bring insights for future prevention and treatment of HTS.

关键词： Hypertrophic scars Animal model Cytokines Growth factors Macrophages Stromal cell-derived factor 1/CXCR4 signaling

Rapid climate change-induced collapse of hunter-gatherer societies in the lower Mississippi River valley between ca. 3300 and 2780 cal yr BP

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Science China Earth Sciences 2018年第2期61卷 178-189页

作者： tristram r.kidder edward r.henry lee j.arco Department of Anthropology Washington University in St. Louis St. Louis 63130 USA Geoarehaeology Laboratory Washington University in St. Louis St. Louis 63130 USA GAI Consultants Inc. Homestead PA 15120 USA Teaching and Experimental Center for Archaeology and Cultural Heritage Protection Henan University Kaifeng 475001 China

Hunter-gatherer communities in the American Southeast reached an apogee of social and political complexity in the period between ca. 4200 and 3000 cal yr BP. In the lower Mississippi Valley(LMV) the Poverty Point culture defined this period of socio-political elaboration. However, following a significant period of climate change that led to exceptional flooding and a major reorganization of the course of the Mississippi River, this culture collapsed beginning ca. 3300–3200 cal yr BP and the LMV was abandoned for the subsequent 500 years. In this study, we use data from the Jaketown site in the Yazoo Basin of west-central Mississippi to refine the chronology of the climate event that caused the collapse of the Poverty Point culture. A large flood buried Poverty Point-era occupation deposits at Jaketown around 3310 cal yr BP. Lateral migration of the Mississippi River during flooding led to inundation of the Yazoo Basin and re-occupation of ancient river courses. A coarse sand stratum topped by a more than a meter-thick fining upward sediment package marks a crevasse deposit caused by a rupture of the natural levee at Jaketown. This levee breach was part of a larger pattern of erratic flooding throughout the LMV and is associated with major landscape evolution and the abandonment of Poverty Point sites within the valley. Early Woodland peoples re-colonized the crevasse surface after ca. 2780 cal yr BP. Following this event, the Jaketown site and the eastern Yazoo Basin witnessed a period of landscape stability that lasts to this day. These archaeological data demonstrate how climate change and natural disasters can lead to socio-political dissolution and reorganization even in relatively small-scale hunter-gatherer populations.

关键词： Rapid climate change Hunter-gatherers Flooding Mississippi River Valley Poverty Point Jaketown site

Machine-learned metrics for predicting the likelihood of success in materials discovery

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npj Computational Materials 2020年第1期6卷 539-547页

作者： Yoolhee Kim edward Kim Erin Antono Bryce Meredig Julia Ling Citrine Informatics Redwood CityCA 94063USA

Materials discovery is often compared to the challenge of finding a needle in a *** much work has focused on accurately predicting the properties of candidate materials with machine learning(ML),which amounts to evaluating whether a given candidate is a piece of straw or a needle,less attention has been paid to a critical question:are we searching in the right haystack?We refer to the haystack as the design space for a particular materials discovery problem(i.e.,the set of possible candidate materials to synthesize),and thus frame this question as one of design space *** this paper,we introduce two metrics,the predicted fraction of improved candidates(PFIC),and the cumulative maximum likelihood of improvement(CMLI),which we demonstrate can identify discovery-rich and discovery-poor design spaces,respectively.A combined classification system,composed of the CMLI and PFIC metrics,is then used to identify optimal design spaces with high precision,and thus show the potential to significantly accelerate ML-driven materials discovery.

关键词： likelihood predicting searching