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Deepening Collaboration China and Africa need to further align development strategies to realise the immense potential of economic cooperation

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ChinAfrica 2025年第1期17卷 24-26页

作者： EHIZUELEN MICHAEL MITCHELL OMORUYI Centre for Nigerian studies Institute of African StudiesZhejiang Normal University

Humming factories,bustling ports,and shuttling merchants highlight the vibrancy of China-Africa economic and trade *** the years,this partnership has grown significantly,optimising trade structures and fostering mutual *** deepening collaboration is evident in China’s role as Africa’s largest bilateral trading partner for 15 consecutive *** the first seven months of 2024,trade between China and African countries reached$167 billion,reflecting a 5.5-percent increase compared to the same period in *** to the international Monetary Fund,approximately 20 percent of Africa’s exports now go to China,while 16 percent of its imports originate there.

关键词： trading deepening Africa

Thermal Analysis of Metal Foam Matrix Composite Phase Change Material

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Journal of Thermal Science 2015年第4期24卷 386-390页

作者： SONG Xiange Beijing international studies University

In this paper,CPCM(Composite Phase Change Material)was manufactured with metal foam matrix used as filling *** temperature curves were obtained by *** performance of heat transfer was *** experimental results show that metal foam matrix can improve temperature uniformity in phase change thermal storage material and enhance heat conduction *** thermal performance of CPCM is significantly *** efficiency of temperature control can be obviously improved by adding metal foam in phase change *** is in solid-liquid two-phase region when temperature is close to phase change point of *** approximate plateau *** plateau can be considered as the temperature control zone of *** can be transferred fiom hot source and be uniformly spread in thermal storage material by using metal foam matrix since thermal storage material has the advantage of strong heat storage capacity and disadvantage of poor heat conduction *** convection promotes the melting of solid-liquid phase change *** thermal conductivity of foam metal accelerates heat conduction of solid-liquid phase change *** interior temperature difference decreases and the whole temperature becomes more *** the same porosity with a metal foam,melting time of solid-liquid phase change material *** conduction is enhanced and natural convection is suppressed when pore size of metal foam is *** thermal storage time decreases and heat absorption rate increases when the pore size of metal foam *** research results can be used to guide fabricating the CPCM.

关键词： Metal Foam Matrix Composite Phase Change Material Thermal Storage Heat Absorption Rate

Recent development in electrode design for wide-temperature supercapacitors

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Science China Chemistry 2025年第1期 96-117页

作者： Jianhong Liu Qiang Zhou Yuxiao Lin Xinsheng Zhao Guangmin Zhou Xiaoxiao Li School of Physics and Electronic Engineering Jiangsu Normal University Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen international Graduate School Tsinghua University

An ever-increasing market demand has stimulated the soaring enthusiasm of researchers to develop wide-temperature supercapacitors(SCs). The active electrode is one of the most important parts of SC, which is directly related to the energy density,power transmission and long-term cyclability of the device in the wide-temperature environment. Compared with the SC electrodes aimed for room-temperature application, the SC electrodes for operating at wide-temperature scene often face greater challenges. In this review, the main challenges of SC electrodes under various temperature conditions, including low, high and cross-fade temperatures, are summarized. The relevant performance decay and failure mechanisms of wide-temperature SC electrodes are analyzed. In addition, this review deals with the recent studies and developments in robust wide-temperature SC electrodes with respect to the rational design of electrode structures and the exploitation of advanced active materials. Finally, the future directions for exploring reliable wide-temperature SCs are also proposed.

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Automatic image enhancement by learning adaptive patch selection

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Frontiers of Information Technology & Electronic Engineering 2019年第2期20卷 206-221页

作者： Na LI Jian ZHANG School of Science and Technology Zhejiang International Studies University

Today, digital cameras are widely used in taking photos. However, some photos lack detail and need enhancement. Many existing image enhancement algorithms are patch based and the patch size is always fixed throughout the image. Users must tune the patch size to obtain the appropriate enhancement. In this study,we propose an automatic image enhancement method based on adaptive patch selection using both dark and bright channels. The double channels enhance images with various exposure problems. The patch size used for channel extraction is selected automatically by thresholding a contrast feature, which is learned systematically from a set of natural images crawled from the web. Our proposed method can automatically enhance foggy or under-exposed/backlit images without any user interaction. Experimental results demonstrate that our method can provide a significant improvement in existing patch-based image enhancement algorithms.

关键词： Image enhancement Contrast enhancement Dark channel Bright channel Adaptive patch based processing

Multifunctional landscapes—perspectives for the future

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Journal of Environmental Sciences 2003年第2期15卷 187-192页

作者： Jesper Brandt Department of Geography and international Development studies Roskilde University

New methods in landscape ecology to study the link between landscape heterogeneity and landscape functionality are needed. Heterogeneity is a basic characteristic of landscape, and landscape function is the capacity to change the structural heterogeneity of a landscape system. In most developed countries the industrialisation of agriculture has in general resulted in a change of agricultural landscapes from a small-grained heterogeneous pattern towards more monotonous and monofunctional landscapes. During the 1990's this trends seems to have changed due to a diversification of rural land use and new trends in urbanisation. Weather these phases of landscape development should be expected in developing countries is a totally open question. Dealing with the study of multifunctionality of landscapes it is proposed to distinguish between ecological functionality of landscape ecosystems, functionality pertaining to land use and social functionality. Further, the relation between function, space and scale is important by the determination of spatial and time segregation as well as spatial and time integration of multifunctionality in landscapes.

关键词： landscape heterogeneity monotonisation multifunctionality spatial segregation time segregation landscape development

EXISTENCE OF COMPETITIVE EQUILIBRIUM OF LARGE SECURITY-SPOT MARKET WITH INCOMPLETE ASSET STRUCTURE

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Journal of Systems Science & Complexity 2007年第3期20卷 386-396页

作者： Guosheng ZHANG School of international Trade and Economics Beijing International Studies University Beijing 100024 China.

With the concept of security-spot market or security market with measurable space of agents, which was first given by Zhang （1998, 2000）, we continue to discuss the existence of equilibrium in such large economies. Under common conditions, we have claimed the existence of equilibrium in incomplete security-spot market with a continuum of traders. Because of the development from complete market to incomplete market, we have not only generalized Aumann＇s results in 1966, but also achieved a breakthrough on researching methods.

关键词： Equilibrium incomplete asset structure large economy security-spot market with measurable space of agents.

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Acta Mathematica Sinica,English Series 2015年第1期31卷 44-60页

作者： Hong Liang LI Department of Mathematics Zhejiang International Studies University

In the present paper, we prove the existence of global solutions for the Navier-Stokes equations in R^n when the initial velocity belongs to the weighted weak Lorentz space A^n,∞ （u） with a sufficiently small norm under certain restriction on the weight u. At the same time, self-similar solutions are induced if the initial velocity is, besides, a homogeneous function of degree -1. Also the uniqueness is discussed.

关键词： Navier-Stokes equations self-similar solutions convolution weighted Lorentz spaces

Belt and Road Initiative and Transformation of international Energy Order

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国际问题研究 2018年第3期 231-243页

作者： Yang Chenxi Department for international Strategic studies China Institute of International Studies (CIIS)

Mapping the trends and prospects of battery cathode materials based on patent landscape

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Frontiers in Energy 2023年第6期17卷 822-832页

作者： Chen YANG Xin-Yu MU School of Japanese Culture and Economy Xi’an International Studies UniversityXi’an 710128China The Northeast Asian Research Center Xi’an International Studies UniversityXi’an 710128China

Advancing portable electronics and electric vehicles is heavily dependent on the cutting-edge lithium-ion (Li-ion) battery technology, which is closely linked to the properties of cathode materials. Identifying trends and prospects of cathode materials based on patent analysis is considered a kernel to optimize and refine battery related markets. In this paper, a patent analysis is performed on 6 popular cathode materials by comprehensively considering performance comparison, development trend, annual installed capacity, technology life cycle, and distribution among regions and patent assignees. In the technology life cycle, the cathode materials majorly used in electric vehicle have entered maturity stage, while the lithium cobalt oxide (LCO) cathode that is widely used in portable electronics is still in the growth stage. In global patent distributions, China holds more than 50% of total patents. In the top 10 patent assignees of 6 cathode materials, 2 institutes are from China with the rest being Japan (6) and Republic of Korea (2), indicating that the technology of cathode materials in China is relatively scattered while cathode research is highly concentrated in Japan and Republic of Korea. Moreover, the patent distribution has to consider practical issues as well as the impacts of core patents. For example, the high cost discourages the intention of applying international patents. This paper is expected to stimulate battery research, understand technical layout of various countries, and probably forecast innovative technology breakthroughs.

关键词： patent analysis cathode batteries technology life cycle