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Microbiological quality of roof tank water in an urban village in southeastern China

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Journal of Environmental Sciences 2023年第3期125卷 148-159页

作者： Dong Hu Jie zeng Jing chen Wenfang Lin xinyan Xiao Mingbao Feng xin Yu Key Laboratory of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China Shitang Community Health Service Center Xiamen 361026China College of the Environment and Ecology Xiamen UniversityXiamen 361005China

Urban villages are unique residential neighborhoods in urban areas in China. Roof tanks are their main form of water supply, and water quality deterioration might occur in this system because of poor hygienic conditions and maintenance. In this study, water samples were seasonally collected from an urban village to investigate the influence of roof tanks as an additional water storage device on the variation in the microbial community structure and pathogenic gene markers. Water stagnation in the roof tank induced significant decreases in chlorine(p < 0.05), residual chlorine was as low as 0.02 mg/L in spring. Propidium monoazide(PMA)-qPCR revealed a one-magnitude higher level of total viable bacterial concentration in roof tank water samples(2.14 ± 1.81 × 105gene copies/mL) than that in input water samples(3.57 ± 2.90 × 104gene copies/mL, p < 0.05), especially in spring and summer. In addition,pathogenic fungi, Mycobacterium spp., and Legionella spp. were frequently detected in the roof tanks. Terminal users might be exposed to higher microbial risk induced by high abundance of Legionella gene marker. Spearman’s rank correlation and redundancy analysis showed that residual chlorine was the driving force that promoted bacterial colonization and shaped the microbial community. It is worth noted that the sediment in the pipe will be agitated when the water supply is restored after the water outages, which can trigger an increase in turbidity and bacterial biomass. Overall, the findings provide practical suggestions for controlling microbiological health risks in roof tanks in urban villages.

关键词： Urban village Water storage tank Microbiological water quality Propidium monoazide(PMA)-qPCR Illumina sequencing

InputJump: Augmented reality-facilitated cross-device input fusion based on spatial and semantic information

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虚拟现实与智能硬件（中英文） 2024年第6期6卷 502-526页

作者： xin zeng Xiaoyu WANG Tengxiang ZHANG Yukang YAN Yiqiang chen Institute of Computing Technology Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 101408China Goertek Inc. Bejing 261031China The Hong Kong University of Science and Technology Hong Kong 999077China Department of Computer Science Hajim School of Engineering and Applied SciencesUniversity of RochesterRochesterNY 14627US

The proliferation of computing devices requires seamless cross-device *** reality(AR)headsets can facilitate interactions with existing computers owing to their user-centered views and natural *** this study,we propose InputJump,a user-centered cross-device input fusion method that maps multi-modal cross-device inputs to interactive elements on graphical *** input jump calculates the spatial coordinates of the input target positions and the interactive elements within the coordinate system of the AR *** also extracts semantic descriptions of inputs and elements using large language models(LLMs).Two types of information from different inputs(e.g.,gaze,gesture,mouse,and keyboard)were fused to map onto an interactive *** proposed method is explained in detail and implemented on both an AR headset and a desktop *** then conducted a user study and extensive simulations to validate our proposed *** results showed that InputJump can accurately associate a fused input with the target interactive element,enabling a more natural and flexible interaction experience.

关键词： Mixed reality Spatial Semantic Large language models

Contrasting responseS of hoverflies and wild bees to habitat structure and land use change in a tropical landscape （southern Yunnan, SW China）

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Insect Science 2012年第6期19卷 666-676页

作者： Ling-zeng Meng Konrad Martin Jing-xin Liu Frank Burger Jin chen University of Hohenheim Institute of Plant Production and Agroecology in the Tropics and Subtropics(380b)StuttgartGermany Xishuangbanna Tropical Botanical Garden the Chinese Academy of SciencesMenglaYunnan 666303China Natural History Museum of Erfurt Germany

The response of insects to monoculture plantations has mainly proceeded at the expense of natural forest areas, and is an outstanding and important issue in ecology and conservation biology, with pollination services declined around the world. In this study, species richness and distribution of hoverfly and wild bee communities were investigated in a changing tropical landscape in southern Yunnan, south-west China by Malaise traps periodically from 2008 to 2009. Species were recorded from the traditional land use types （natural forest, grassland, shrubland and rice field fallows）, and from recently established rubber plantations of different ages. Hoverflies （total 53 species） were most common in young successional stages of vegetation, including rice field fallow and shrubland. Species richness was highest in rice field fallows and lowest in forests and showed a highly significant relationship with the number of forb species and ground vegetation cover. In contrast, the highest richness of wild bees （total 44 species） was recorded from the natural forest sites, which showed a discrete bee community composition compared to the remaining habitat types. There was no significant relationship between the bee species richness and the environmental variables, including the numbers of different plant life forms, coverage of canopy and ground vegetation, successional age of vegetation and land use type. At the landscape scale, open land use systems, including young rubber plantations, are assumed to increase the species richness of hoverflies; however, this might decrease wild bee diversity. The present land use change by rubber cultivation can be expected to have negative impacts on the native wild bee communities.

关键词： Apidae insects pollinators rubber plantations Syrphidae tropical forest

Bi-level optimization based two-stage market clearing model considering guaranteed accommodation of renewable energy generation

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Protection and Control of Modern Power Systems 2022年第1期7卷 433-445页

作者： Qianya He Zhenjia Lin Haoyong chen xinyun Dai Yirui Li xin zeng School of Electric Power South China University of TechnologyGuangzhouChina Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong KongChina

The existing electricity market mechanisms designed to promote the consumption of renewable energy generation complicate network participation in market transactions owing to an unfair market competition environment,where the low cost renewable energy generation is not reflected in the high bidding price of high cost conventional energy *** study addresses this issue by proposing a bi-level optimization based two-stage market clearing model that considers the bidding strategies of market players,and guarantees the accommodation of renewable energy *** first stage implements a dual-market clearing mechanism that includes a unified market for trading the power generations of both renewable energy and conventional energy units,and a subsidy market reserved exclusively for conventional generation units.A re-adjustment clearing mechanism is then proposed in the second stage to accommodate the power generation of remaining renewable energy units after first stage energy *** stage of the proposed model is further described as a bi-level market equilibrium problem and is solved using a co-evolutionary ***,numerical results involving an improved IEEE 39-bus system dem-onstrate that the proposed two-stage model meets the basic requirements of incentive compatibility and individual *** can facilitate the rational allocation of resources,promote the economical operation of electric power grids,and enhance social welfare.

关键词： Market clearing Renewable energy Bidding strategy Guaranteed accommodation Bi-level optimization Fair competition

Facile synthesis of Li2S@C composites as cathode for Li–S batteries

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Journal of Energy Chemistry 2019年第10期28卷 111-116页

作者： xin chen Linfeng Peng Lixia Yuan Rui zeng Jingwei Xiang Weilun chen Kai Yuan Jie chen Yunhui Huang Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Lithium sulfide (Li2S) provides a promising route for lithium storage due to high theoretical specific capacity (1166 mAh g-1). The electrochemical performance of Li2S can be significantly enhanced by forming Li2S-carbon composites with the introduction of carbon. However, the complex synthesis method of Li2S-carbon composites restrains the large-scale productivity. Herein, we propose a facile route to prepare carbon coated Li2S-carbon nanotube composites (Li2S@C-CNT) via spray drying and heat treatment, which is a low-cost and large-scale method for facile synthesis of Li2S-carbon composites. For the Li2S@C-CNT composites, Li2S nanoparticles are contacted with surrounding particles due to the 3D CNTs framework. The novel construction not only suppresses the diffusion of polysulfides during cycling, but also remarkably accelerates the transport of electron and ion, resulting in a high specific capacity (1100 mAh g^-1) and good cycling performance. The rational designed architecture and good electrochemical performance of Li2S@C-CNT will pave the avenue for realizing high energy density of Li2S-based batteries.

关键词： Spray drying Li2S@C-CNT Lithium-sulfur batteries

Glacial Refugia of Ginkgo biloba and Human Impact on Its Genetic Diversity:Evidence from Chloroplast DNA

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Journal of Integrative Plant Biology 2008年第3期50卷 368-374页

作者： Wei Gong Zhen zeng Ye-Ye chen Chuan chen Ying-Xiong Qiu cheng-xin Fu Laboratory of Systematic Evolutionary Botany and Biodiversity and State Conservation Center for Gene Resources of Endangered Wildlife College of Life Sciences Zhejiang University Hangzhou 310058 China

Variations in the trnK region of chloroplast DNA were investigated in the present study using polymerase chain reactionrestriction fragment length polymorphism to detect the genetic structure and to infer the possible glacial refugia of Ginkgo biloba L. in China. In total, 220 individuals from 12 populations in China and three populations outside China were analyzed, representing the largest number of populations studied by molecular markers to date. Nineteen haplotypes were produced and haplotype A was found in all populations. Populations in south-western China, including WC, JF, PX, and SP, contained 14 of the 19 haplotypes and their genetic diversity ranged from 0.771 4 to 0.867 6. The TM population from China also showed a high genetic diversity （H = 0.848 5）. Most of the genetic variation existed within populations and the differentiation among populations was low （GsT = 0.2）. According to haplotype distribution and the historical record, we suggest that populations of G. biloba have been subjected to extensive human impact, which has compounded our attempt to infer glacial refugia for Ginkgo. Nevertheless, the present results suggest that the center of genetic diversity of Ginkgo is mainly in south-western China and in situ conservation is needed to protect and preserve the genetic resources.

关键词： chloroplast DNA Ginkgo biloba glacial refugia human activities polymerase chain reaction-restriction fragment length polymorphism

The potential mechanism and clinical application value of remote ischemic conditioning in stroke

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Neural Regeneration Research 2025年第6期20卷 1613-1627页

作者： Yajun Zhu Xiaoguo Li xingwei Lei Liuyang Tang Daochen Wen Bo zeng Xiaofeng Zhang Zichao Huang Zongduo Guo The First Affiliated Hospital of Chongqing Medical University ChongqingChina

Some studies have confirmed the neuroprotective effect of remote ischemic conditioning against stroke. Although numerous animal researches have shown that the neuroprotective effect of remote ischemic conditioning may be related to neuroinflammation, cellular immunity, apoptosis, and autophagy, the exact underlying molecular mechanisms are unclear. This review summarizes the current status of different types of remote ischemic conditioning methods in animal and clinical studies and analyzes their commonalities and differences in neuroprotective mechanisms and signaling pathways. Remote ischemic conditioning has emerged as a potential therapeutic approach for improving stroke-induced brain injury owing to its simplicity, non-invasiveness, safety, and patient tolerability. Different forms of remote ischemic conditioning exhibit distinct intervention patterns, timing, and application range. Mechanistically, remote ischemic conditioning can exert neuroprotective effects by activating the Notch1/phosphatidylinositol 3-kinase/Akt signaling pathway, improving cerebral perfusion, suppressing neuroinflammation, inhibiting cell apoptosis, activating autophagy, and promoting neural regeneration. While remote ischemic conditioning has shown potential in improving stroke outcomes, its full clinical translation has not yet been achieved.

关键词： Akt apoptosis autophagy cerebral perfusion cerebral vascular stenosis clinical transformation hemorrhagic stroke ischemic stroke neuroinflammation neuroprotection Notch1 PI3K remote ischemic conditioning stroke

Bimetallic chalcogenides for electrocatalytic CO_(2)reduction

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Rare Metals 2021年第12期40卷 3442-3453页

作者： Qian Li Yu-Chao Wang Jian zeng xin Zhao chen chen Qiu-Mei Wu Li-Miao chen Zhi-Yan chen Yong-Peng Lei School of Material Science and Engineering Central South University of Forestry and TechnologyChangsha 410004China State Key Laboratory of Powder Metallurgy Hunan Key Laboratory of Two-Dimensional MaterialsCentral South UniversityChangsha 410083China Energy Materials Computing Center Jiangxi University of Science and TechnologyNanchang 330013China Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China

Electrocatalytic CO_(2)reduction reaction(CO_(2)RR)converts CO_(2)into valuable chemical fuels,which can effectively alleviate global warming and energy ***,limited by its slow reaction rate and low product selectivity,it is urgent to design efficient,cheap,safe,and highly selective CO_(2)RR *** to the advantages of adjustable electronic structure,abundant active sites,low cost,environmental friendliness and excellent electrochemical performance,bimetallic chalcogenides have aroused great ***,we briefly summarized different bimetallic oxides and sulfides for electrocatalytic CO_(2)RR in the past five *** addition,different hybridizations formed between metal atoms,including intermetallic compounds,heterostructures and metal doping,were *** positive effects on CO_(2)RR catalytic selectivity and activity were deeply ***,we also put forward some views about the future research directions and perspectives in CO_(2)RR *** review aims to provide a reference for the rational design of bimetallic chalcogenides towards electrocatalytic CO_(2)reduction.

关键词： Electrocatalysis CO_(2)reduction Bimetallic chalcogenides Electronic structure

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产品优化设计的资源分配模型

系统工程学报 2003年第3期18卷 284-288页

作者：唐加福刘士新陈以增汪定伟东北大学信息科学与工程学院沈阳110004 东北大学机械工程与自动化学院沈阳110004

研究产品优化设计中设定设计属性值的资源分配方法.考虑产品设计过程中多种资源的优化分配,在设计预算和资源约束下,设定产品设计属性值,使用户对产品的总体满意水平达到最大.这种方法使产品优化设计的品质功能展开方法从策略计划层扩... 详细信息

研究产品优化设计中设定设计属性值的资源分配方法.考虑产品设计过程中多种资源的优化分配,在设计预算和资源约束下,设定产品设计属性值,使用户对产品的总体满意水平达到最大.这种方法使产品优化设计的品质功能展开方法从策略计划层扩展到运作计划层,把品质优化设计和资源分配结合起来,使得品质设计计划在部件展开(partdeployment)层和运作层的工艺计划(operationalprocessplanning)更可行,更易实现.

关键词：产品优化设计资源分配模型数学规划品质功能展开