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Cross-border Urban Networks Based on Manufacturing Global Value Chain:A Study of Listed Companies in Western China

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Chinese Geographical Science 2023年第6期33卷 1033-1052页

作者： MAN Shan YANG Yongchun ZENG Tonggang wang meimei College of Earth and Environmental Sciences Lanzhou UniversityLanzhou730000China Key Laboratory of Western China’s Environmental Systems Ministry of Education of the People’s Republic of ChinaLanzhou UniversityLanzhou730000China

Cross-border investment is essential for western China’s *** value chain(GVC)forms cross-border investment networks between industries in western China and overseas *** on GVC,this study uses the social network analysis method,entropy method,multi-index comprehensive evaluation method,and quadratic assignment procedure analysis method to examine the characteristics and influencing factors of the urban networks of research and development(R&D),production,and sales formed as a result of the overseas investments of listed manufacturing companies in western *** showed that the three types of investment networks involved multiple industry types and multiple central cities with differentiated diversity and *** R&D urban network’s leading sub-industries were the mechanical equipment and instruments,medicine and biological products,and metal and nonmetal *** destination cities were mostly those home to educational and scientific research *** production urban network’s leading sub-industries were the mechanical equipment,instrument,and food and beverage *** destination cities were mostly regional central cities in developing *** sales urban network’s leading sub-industries were the mechanical equipment and instrument,metal and nonmetal,and petrochemical and plastics *** destination cities were numerous and *** addition,the R&D urban network easily formed specialized clusters,core nodes easily controlled the production urban network,and individual nodes did not easily control the sales urban *** and economic system advantages greatly impacted the three network *** the different influencing factors,this study suggests optimizing the institutional investment environment to narrow the institutional gap,adjusting and optimizing the investment layout to expand overseas markets,and increasing R&D funds to stimulate technological progress

关键词： manufacturing industry Global value chain(GVC) overseas investment cross-border networks western China

Aging-independent and size-dependent genotoxic response induced by titanium dioxide nanoparticles in mammalian cells

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Journal of Environmental Sciences 2019年第11期31卷 94-106页

作者： Juan wang Jingjing wang Yun Liu Yaguang Nie Bo Si Tong wang Ahmed Waqas Guoping Zhao meimei wang An Xu Key Laboratory of High Magnetic Field and Ion Beam Physical Biology Chinese Academy of Sciences Anhui Province Key Laboratory of Environmental Toxicology and Pollution Control Technology Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei Anhui 230031 P.R.China University of Science and Technology of China Hefei Anhui 230026 P.R.China Department of Pathophysiology Anhui Medical University Hefei Anhui 230032 P.R.China Institutes of Physical Science and Information Technology Anhui University Hefei Anhui 230601 P.R.China

Titanium dioxide nanoparticles (TiO2 NPs) are subjected to various transformation processes (chemical,physical and biological processes) in the environment,potentially affecting their bioavailability and toxic ***,the size variation of TiO2 NPs during aging process and subsequent effects in mammalian cells are largely *** aim of this study was to illustrate the adverse effects of TiO2 NPs in different sizes (5,15 and <100 nm) during aging process on human-hamster hybrid (AL) *** was an aging-time dependent enhancement of average hydrodynamic size in TiO2 NPs stock *** cytotoxicity of fresh TiO2 NPs increased in a size-dependent manner;in contrast,their genotoxicity decreased with the increasing sizes of *** significant toxicity difference was observed in cells exposed to either fresh or 60 day-aged TiO2 *** Fresh and aged TiO2 NPs efficiently induced mitochondrial dysfunction and activated Caspase-3/7 in a size-dependent *** mitochondrial-DNA deficient (ρ°) AL cells,we further discovered that mitochondrial dysfunction made significant contribution to the size-dependent toxicity induced by TiO2 NPs during the aging *** together,our data indicated that TiO2 NPs could significantly induced the cytotoxicity and genotoxicity in an aging time-independent and size-dependent manner,which were triggered by mitochondrial *** study suggested the necessity to include size as an additional parameter for the cautious monitoring of TiO2 NPs disposal before entering the environment.

关键词： TiO2 NPs Aging process Human-hamster hybrid (AL) cells Mitochondria Size-effects

Role of nitric oxide in the genotoxic response to chronic microcystin-LR exposure in human–hamster hybrid cells

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Journal of Environmental Sciences 2015年第3期27卷 210-218页

作者： Xiaofei wang Pei Huang Yun Liu Hua Du Xinan wang meimei wang Yichen wang Tom K.Hei Lijun Wu An Xu Key Laboratory of Ion Beam Bioengineering Hefei Institutes of Physical Science Chinese Academy of Sciences Institute of Intelligent Machines Hefei Institutes of Physical Science Chinese Academy of Sciences Center for Radiological Research College of Physicians & Surgeons Columbia University

Microcystin-LR （MC-LR） is the most abundant and toxic microcystin congener and has been classified as a potential human carcinogen （Group 2B） by the International Agency for Research on Cancer. However, the mechanisms underlying the genotoxic effects of MC-LR during chronic exposure are still poorly understood. In the present study, human-hamster hybrid （AL） cells were exposed to MC-LR for varying lengths of time to investigate the role of nitrogen radicals in MC-LR-induced genotoxicity. The mutagenic potential at the CD59 locus was more than 2-fold higher （p 〈 0.01） in AL ceUs exposed to a cytotoxic concentration （1 μmol/L） of MC-LR for 30 days than in untreated control ceils, which was consistent with the formation of micronucleus. MC-LR caused a dose-dependent increase in nitric oxide （NO） production in treated cells. Moreover, this was blocked by concurrent treatment with the NO synthase inhibitor NC-methyl-L-arginine （L-NMMA）, which suppressed MC-LR- induced mutations as well. The survival of mitochondrial DNA-depleted （pO） AL ceils was markedly decreased by MC-LR treatment compared to that in AL cells, while the CD59 mutant fraction was unaltered. These results provided clear evidence that the genotoxicity associated with chronic MC-LR exposure in mammalian cells was mediated by NO and might be considered as a basis for the development of therapeutics that prevent carcinogenesis.

关键词： Microcystin-LR (MC-LR) Chronic exposure Genotoxicity Nitric oxide

Mechanization technology:The key to sugarcane production in China

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International Journal of Agricultural and Biological Engineering 2013年第1期6卷 1-27页

作者： Ou Yinggang Malcolm Wegener Yang Dantong Liu Qingting Zheng Dingke wang meimei Liu Haochun College of Engineering South China Agricultural UniversityGuangzhou 510642China School of Agriculture and Food Sciences The University of QueenslandBrisbaneQLD4072Australia

Sugarcane is an important cash crop in southern China now planted on about 1.5 million ha in the main production areas in Guangxi,Zhuang Autonomous Region and Yunnan,Guangdong,and Hainan *** the cost of labor in China is increasing rapidly and the price of local sugar is uncompetitive with the product from mechanized international producers,China needs to change its sugarcane production methods from manual work to mechanization in order to catch up with international trends in this global *** a lot of effort in China have gone into sugarcane mechanization since the 1960s,the overall level of mechanization in sugarcane production is still only approximately 30%,which is about 20%lower than that achieved in the other main field *** all of the sugarcane grown in China is still harvested by *** order to summarize past experience and promote the mechanization of sugarcane production in China,this paper reviews the whole process of developing mechanization since 1960s and describes the current state of sugarcane mechanization in *** research currently being undertaken and the main obstacles to be overcome in developing a mechanized sugarcane production system,are *** design and testing of sugarcane harvesting machinery and its key components has been a significant research area by some Chinese universities,research institutes,and manufacturing companies in these past *** paper reviews that research and outlines the main achievements which have been made in this *** harvesting systems for sugarcane,and the appropriate harvesting patterns suitable for different growing conditions applying in China,have also been *** paper concludes with some comments on the future directions for progress in China’s mechanization of sugarcane production and some policy suggestions to facilitate the industry's transition.

关键词： mechanization technology sugarcane production sugarcane harvester sugarcane machinery development pattern

A Russian Collector of Chinese Traditional Toys

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China & The World Cultural Exchange 2000年第5期66卷 29-31页

作者： wang meimei

Quite by chance, I met lima Zakharova, wife ofthe Russian cultural attache Zakharov. With herhusband interpreting, we had a chat. I was deeply impressed by her interest in and knowledge of the Chinesefolk culture, par... 详细信息

关键词： A Russian Collector of Chinese Traditional Toys

A Female Ambassador of Chinese Origin──An interview with Zhu Zhiyun,Ambassador of Mauritius to China

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China & The World Cultural Exchange 2000年第6期66卷 6-7页

作者： wang meimei

Sitting on the sofa in front of me and speaking standard Mandarin with a slight southern accent, she had nothing that reminded me thatshe is Mauritius Ambassador to China. Our conversation naturally started with her C... 详细信息

关键词： A Female Ambassador of Chinese Origin An interview with Zhu Zhiyun,Ambassador of Mauritius to China

Silicon lithium-ion battery anode with enhanced performance： Multiple effects of silver nanoparticles

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Journal of Materials Science & Technology 2018年第10期34卷 1902-1911页

作者： Shanshan Yin Qing Jia Xiuxia Zuo Shuang Xie Kai Fang Yonggao Xia Jinlong Li Bao Qiu meimei wang Jianzhen Ban Xiaoyan wang Yi Zhang Ying Xiao Luyao Zheng Suzhe Liang Zhaoping Liu Cundong wang Ya-Jun Cheng Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China North University of China Taiyuan 030051 China The University of Nottingham Ningbo China Ningbo 315100 China Nano Science and Technology Institute University of Science and Technology of China Suzhou 215123 China Department of Materials University of Oxford Parks Rd. OX1 3PH Oxford UK

Silicon has been regarded as one of the most promising next generation lithium-ion battery anode. How- ever, the poor cyclic stability of the Si based anode has severely limited its practical applications, which is even worse with high mass loading density （〉1 mg cm^-2 ）. A new concept has been developed to enhance the electrochemical performance of the Si nanoparticle anode. Silver nanoparticles are composited with the silicon nanoparticles in a facile way for the first time. It is found that the mechanical properties of the Si electrode have been significantly improved by the incorporation of the silver nanoparticles, leading to enhanced cyclic performance. With the Si/Ag mass ratio of 4：1, the reversible specific discharge capacity is retained as l 156 mA h g^-1 after 100 cycles at 200 mAg^-1, which is more than three times higher than that of the bare silicon （318 mA h g^-1 ）. The rate performance has been effectively improved as well due to excellent electron conductivity of the silver nanoparticles.

关键词： Silicon Silver Nanoparticles Nanocomposite Lithium-ion battery Anode

A chromosome-scale reference genome of Aquilegia oxysepala ***

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Horticulture Research 2020年第1期7卷 1413-1425页

作者： Jinghe Xie Haifeng Zhao Kunpeng Li Rui Zhang Yongchao Jiang meimei wang Xuelian Guo Ben Yu Hongzhi Kong Yuannian Jiao Guixia Xu State Key Laboratory of Systematic and Evolutionary Botany CAS Center for Excellence in Molecular Plant SciencesInstitute of BotanyChinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China

The genus Aquilegia(Ranunculaceae)has been cultivated as ornamental and medicinal plants for *** petal spurs of strikingly diverse size and shape,Aquilegia has also been recognized as an excellent system for evolutionary ***‐mediated selection for longer spurs is believed to have shaped the evolution of this genus,especially the North American ***,however,an opposite evolutionary trend was reported in an Asian lineage,where multiple origins of mini-or even nonspurred morphs have *** as it is,the lack of genomic resources has limited our ability to decipher the molecular and evolutionary mechanisms underlying spur reduction in this special *** long-read sequencing(PacBio Sequel),in combination with optical maps(BioNano DLS)and Hi–C,we assembled a high-quality reference genome of *** ***,a sister species to the nonspurred *** final assembly is approximately 293.2 Mb,94.6%(277.4 Mb)of which has been anchored to 7 pseudochromosomes.A total of 25,571 protein-coding genes were predicted,with 97.2%being functionally *** comparing this genome with that of ***,we detected a large rearrangement between Chr1 and Chr4,which might have caused the Chr4 of *** *** to partly deviate from the“decaying”path that was taken before the split of Aquilegia and *** high-quality reference genome is fundamental to further investigations on the development and evolution of petal spurs and provides a strong foundation for the breeding of new horticultural Aquilegia cultivars.

关键词： striking foundation breeding

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硅/铜/碳纳米杂化材料制备及锂电性能研究

材料导报 2016年第24期30卷 16-20,47页

作者：王梅梅潘晶程亚军中国科学院宁波材料技术与工程研究所宁波315201 宁波大学材料科学与化学工程学院宁波315211

以纳米硅粉为硅源,乙酸铜为铜纳米粒子前驱体,双官能团甲基丙烯酸酯单体为溶剂和碳源,利用热引发聚合方法,结合高温氩气气氛煅烧,原位可控合成硅/铜/碳纳米杂化材料,并通过后续不同气氛(空气或者空气结合氢气)、不同温度条件下热处理,... 详细信息

以纳米硅粉为硅源,乙酸铜为铜纳米粒子前驱体,双官能团甲基丙烯酸酯单体为溶剂和碳源,利用热引发聚合方法,结合高温氩气气氛煅烧,原位可控合成硅/铜/碳纳米杂化材料,并通过后续不同气氛(空气或者空气结合氢气)、不同温度条件下热处理,进一步调控杂化材料中碳基质含量,达到改善单质硅负极材料循环性能、提高杂化材料导电性能的目的。采用粉末衍射(XRD)、能量弥散X射线谱图(EDX)、热重分析实验(TGA)、扫描电镜(SEM)、电化学阻抗测试(EIS)以及锂离子电池循环性能测试等方法对杂化材料的结构、结晶、组成、形貌、导电性能以及锂电循环性能进行了较为系统的研究。研究结果表明,单质硅以及单质铜均匀分布在碳基质中;单质铜的形成有效提高了杂化材料的导电性;后期热处理能够进一步调控碳基质含量,从而使得杂化材料初始放电比容量从1156mAh/g提高到1997mAh/g,而循环性能得到一定程度保持。

关键词：硅纳米粒子铜纳米粒子锂离子电池负极材料碳基质丙烯酸酯树脂