检索结果-南通市图书馆

Geo-Spatial Information Science 2019年第3期22卷 214-222页

作者： Sanogo Bruno Chao Yang wenwen tian Zhong Xie Yuanzheng Shao School of Geography and Information Engineering China University of GeosciencesWuhanHubeiChina Agence pour le Promotion Touristique du Mali(APTM) HamdallayeBamakoMali Collaborative Innovation Center of Geospatial Technology Wuhan UniversityWuhanChina

In this Web 2.0 era,various and massive tourist experiences and reviews presented on social networks have become important information for tourism *** this paper,we apply social media to explore and study the tourism industry of Bamako,*** 2000 reviewers and their comments about Bamako’s hotels and restaurants from TripAdvisor and Facebook were ***,we integrate official tourism statistic data and field surveying data into the online review *** mining and statistic method are used to analyze the data for purpose of exploring the characteristics about tourism industry in *** we find that:(i)Most tourists are coming to Bamako for business purpose,and they incline to choose the hotels with better service and security condition;(ii)Comments on social media would greatly affect travelers’choice on hotels;(iii)Most travelers are satisfied about Bamako’s accommodation services.

关键词： Social media online reviews tourism industry study Bamako Mali

Environmental concentration of ammonia nitrogen induced marked changes in proteome of clam Ruditapes philippinarum in dose-and time-dependent manner

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Journal of Oceanology and Limnology 2024年第5期42卷 1634-1650页

作者： Ming CONG Zhaoshun LI wenwen tian Yuanmei LI Jiasen LÜ School of Ocean Yantai UniversityYantai 264005China School of Life Sciences Yantai UniversityYantai 264005China

Previous studies have revealed that ammonia nitrogen has several adverse effects on clam Ruditapes ***,knowledge is lacking regarding the related proteins involved in the toxicological responses,which is vital to elucidate the underlying mechanism of ammonia *** this study,clams *** were exposed to ammonia nitrogen for 21 d at two environmentally relevant *** tandem mass tags approach(TMT)was applied to assay the differentially expressed proteins(DEPs)in clam gill tissues on the 3 rd and 21 st ***,a total of 7263 proteins were *** analyses revealed that clam protein profiles changed in dose-and time dependent manner after ammonia nitrogen *** inferred that the clams may face heavy challenges after ammonia exposure,such as unbalanced gender ratio,lysosomal disease,energy lack,neurological disorders,altered glutamine metabolism,increased lipid synthesis,and impaired *** profiles of enzyme activities of glutaminase and glutamine synthase provided direct evidence to verify the related inference from proteome *** of the inferred toxic effects merit further *** study identified important proteins related to ammonia nitrogen toxicity in the clam and indicated the severe stress of marine ammonia pollution on the healthy development of mollusc aquaculture.

关键词： ammonia nitrogen Ruditapes philippinarum proteomic analysis toxicity

Aluminum and phosphorus codoped “superaerophobic” Co3O4 microspheres for highly efficient electrochemical water splitting and Zn-air batteries

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Journal of Energy Chemistry 2020年第11期29卷 324-331页

作者： Xian-Wei Lv Yuping Liu wenwen tian Lijiao Gao Zhong-Yong Yuan National Institute for Advanced Materials School of Materials Science and EngineeringNankai UniversityTianjin 300350China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China

Multifunctional non-precious catalysts for hydrogen/oxygen evolution reaction(HER/OER) and oxygen reduction reaction(ORR) constitute the bottleneck in the applications in electrochemical overall water splitting(OWS) and Zn-air batteries. Herein, a trifunctional electrocatalyst of urchin-like Al,P-codoped Co3O4 microspheres supported on Ni foam(denoted as AP-CONPs/NF) was fabricated via a hydrothermal process and subsequent low-temperature annealing and phosphorization, exhibiting enhanced OER, HER and ORR activities compared with single-doped and undoped samples. Their surface self-organized microstructure and excellent "superaerophobic" feature make a high bubble repellency, which boost diffusion of reactants and electrolyte-electrode intimate contact. The codoping of Al and P elements into Co3O4 betters right the balance among surface chemical state, the increased oxygen vacancies and the promoted charge transfer. Encouraged by these synergistic advantages, the AP-CONPs/NF was further employed as excellent bifunctional electrodes for the OWS(low cell voltage of 1.57 V at 10 mA cm-2) and as air cathode for rechargeable Zn-air batteries(high power density of 89.1 mW cm-2), which demonstrates a great feasibility for practical applications.

关键词： Trifunctional electrocatalysts Co3O4 Overall water splitting Zn-air batteries "Superaerophobic"surface Anion-cation double doping

Extremal Problem with Respect to Merrifield-Simmons Index and Hosoya Index of a Class of Polygonal Chains

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Wuhan University Journal of Natural Sciences 2014年第4期19卷 295-300页

作者： tian wenwen tian Shuangliang HE Xue WANG Yanfeng School of Mathematics and Computer Science Northwest University for Nationalities

The Merrifield-Simmons index of a graph is defined as the total number of the independent sets of the graph and the Ho- soya index of a graph is defined as the total number of the match- ings of the graph. In this paper, the definition of a class of po- lygonal chains is given, ordering of the polygonal chains with respect to Merrifield-Simmons index and Hosoya index are ob- tained, and their extremal graphs with respect to these two topo- logical indices are determined.

关键词： Merrifield-Simmons index: Hosoya index: ordering:extremal graph

Circadian Evening Complex Represses Jasmonate-lnduced Leaf Senescence in Arabidopsis

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Molecular Plant 2018年第2期11卷 326-337页

作者： Yuanyuan Zhang Yan Wang Hua Wei Na Li wenwen tian Kang Chong Lei Wang Key Laboratory of Plant Molecular Physiology CAS Center for Excellence in Molecular Plant Sciences Institute of Botany Chinese Academy of SciencesBeijing 100093 China University of Chinese Academy of Sciences Beijing 100049 China National Center for Plant Gene Research Beijing 100093 China

Plants initiate leaf senescence to reallocate energy and nutrients from aging to developing tissues for optimizing growth fitness and reproduction at the end of the growing season or under stress. Jasmonate （JA）, a lipid-derived phytohormone, is known as an important endogenous signal in inducing leaf senescence. However, whether and how the circadian clock gates JA signaling to induce leaf senescence in plants remains elusive. In this study, we show that Evening Complex （EC）, a core component of the circadian oscillator, negatively regulates leaf senescence in Arabidopsis thaliana. Transcriptomic profiling analysis reveals that EC is closely involved in JA signaling and response, consistent with accelerated leaf senescence unanimously displayed by EC mutants upon JA induction. We found that EC directly binds the promoter of MYC2, which encodes a key activator of JA-induced leaf senescence, and represses its expression. Ge- netic analysis further demonstrated that the accelerated JA-induced leaf senescence in EC mutants is abrogated by myc2 myc3 myc4 triple mutation. Collectively, these results reveal a critical molecular mechanism illustrating how the core component of the circadian clock gates JA signaling to regulate leaf senescence.

关键词： circadian clock Evening Complex JA signal leaf senescence MYC2

Molecular core–shell structure design:Facilitating delayed fluorescence in aggregates toward highly efficient solution-processed OLEDs

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Aggregate

Aggregate 2022年第2期3卷 132-142页

作者： Dan Liu Meng Zhang wenwen tian Wei Jiang Yueming Sun Zheng Zhao Ben Zhong Tang Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and DeviceSchool of Chemistry and Chemical EngineeringSoutheast UniversityNanjingP.R.China Shenzhen Institute of Aggregate Science and Technology School of Science and EngineeringThe Chinese University of Hong KongGuangdongChina

Light has been sought and explored by human since ancient *** the most important form of light,fluorescence is significant to applications in bioimaging and optoelectronic ***,fluorescence quenching problem constitutes a serious bottleneck in materials *** from the core–shell structure in nature,we report an effective strategy to overcome this long-standing problem by utilizing a molecular core–shell *** an emissive core and multifunctional shell fragments,these compounds show aggregation-induced delayed fluorescence(AIDF)properties by restricting singlet oxygen(^(1)O_(2))generation and suppressing the triplet–triplet annihilation(TTA).Protected by the functional shell,the aggregation-induced emission luminogens(AIEgens)exhibit strong emission with high photoluminescent quantum yield and exciton ***,because the shell materials can form exciplex with electron-transport materials,the fully solution-processed organic light-emitting diodes(OLEDs)based on these core–shell materials show low turnon voltages,excellent device performance with current efficiency of 61.4 cd A–1 and power efficiency of 42.8 lm W–1,which is a record-breaking efficiency based on all-solution processed organic multilayer systems among the AIE-OLEDs so *** simple visualization strategy based on molecular core–shell structure provides a promising platform for AIEgens used in the fully wet-processed optoelectronic field.

关键词： aggregation-induced emission(AIE) molecular core-shell structure organic light-emitting diodes(OLEDs) triplet-triplet annihilation(TTA)

长江经济带农业绿色增长的时空格局及影响因素研究

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中国生态农业学报（中英文） 2020年第5期28卷 764-774页

作者：丘雯文钟涨宝田文文华中农业大学经济管理学院武汉430070 华中农业大学农村社会建设与管理研究中心武汉430070

加快发展方式转变,促进农业绿色增长是缓解农业污染、提高农业效率的重要举措。长江经济带是我国重要的农业生产区域和产粮基地,为科学分析长江经济带农业绿色经济增长水平及其影响因素,本文采用能值方法定量研究了2003-2017年长江经济... 详细信息

加快发展方式转变,促进农业绿色增长是缓解农业污染、提高农业效率的重要举措。长江经济带是我国重要的农业生产区域和产粮基地,为科学分析长江经济带农业绿色经济增长水平及其影响因素,本文采用能值方法定量研究了2003-2017年长江经济带农业绿色生产总值。在此基础上,利用空间计量经济模型分析其时空格局与影响因素。结果表明:1)2003-2017年长江经济带农业绿色生产总值总体稳定上升,且增幅小于农业传统生产总值,农业绿色生产总值占农业传统生产总值的比重呈下降趋势。2)长江经济带农业绿色生产总值的区域差异明显,其空间格局仍未改变传统经济增长东部高、西部低的空间分布特征。3)长江经济带农业绿色增长在全局上具有显著的空间集聚特征,但这种集聚效应呈逐步减弱趋势。4)经济发展水平、科技创新能力、基础设施投资、劳动力素质和农业政策五大因素对本地区农业绿色增长产生正向影响;科技创新能力、基础设施投资对周边地区农业绿色增长产生积极作用。总体上看,长江经济带农业绿色生产总值稳定上升,且呈现"东部高、西部低"的空间分布特征;经济发展水平、科技创新能力等5大因素综合驱动该时期农业绿色增长的时空变化。

关键词：农业绿色增长能值分析法农业绿色生产总值空间计量模型长江经济带

Crossed intergrowth triggered TS-2 microsphere:Formation mechanism,modification and catalytic performance

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Chinese Journal of Catalysis 2020年第7期41卷 1109-1117页

作者： Hao Xu wenwen tian Liping Xu Xin Jin Teng Xue Li Chen Mingyuan He Peng Wu Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China

TS-2 microspheres,consisting of intergrown primary nanocrystals,was prepared by controlling the synthetic *** effects of the amount of quaternary ammonium cations as structure-directing agent,H2O/Si ratio,the presence of alcohol and the temperature were carefully investigated on the crystallization *** high alkalinity was proved to be highly important for the preservation of the microsphere morphology initially formed,due to the unique intergrown stacking *** alkali treatment with the aqueous solution of structure-directing agent,organic amine and ammonium salt and subsequent Na+ion-exchange were performed to enhance the catalytic activity of TS-2 microsphere in the cyclohexanone ammoximation reactions,with both the conversion and selectivity higher than 99%.In the continuous reaction,the TS-2 microspheres exhibited to be durable catalyst with potential application in industrial ammoximation processes.

关键词： Titanosilicate TS-2 microsphere Crossed intergrowth Ammoximation reaction Post-treatment

一种VGI矢量数据增量变化发现的多层次蔓延匹配算法

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武汉大学学报（信息科学版） 2014年第8期39卷 963-967,973页

作者：田文文朱欣焰呙维武汉大学测绘遥感信息工程国家重点实验室湖北武汉430079 武汉大学空天信息安全与可信计算教育部重点实验室湖北武汉430079

矢量要素的匹配是发现地物要素变化的重要方法之一,高精度的匹配结果有助于更快地发现变化地物,进行更新。VGI矢量数据具有几何和语义信息丰富的特点,但使用传统的矢量要素匹配算法难以发挥VGI矢量数据的优势。以城市VGI道路数据为研究... 详细信息

矢量要素的匹配是发现地物要素变化的重要方法之一,高精度的匹配结果有助于更快地发现变化地物,进行更新。VGI矢量数据具有几何和语义信息丰富的特点,但使用传统的矢量要素匹配算法难以发挥VGI矢量数据的优势。以城市VGI道路数据为研究内容,提出基于多层次蔓延的矢量要素匹配算法,将VGI数据和专业测绘数据进行匹配对比,从而实现道路变化增量信息的快速识别。

关键词：自发地理信息多层次蔓延匹配算法矢量数据匹配数据更新

机关事业单位养老保险改革的福利效应:不确定性与消费的视角

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经济研究 2024年第2期59卷 171-189页

作者：田文文岳阳中国社会科学院大学经济学院 102488 厦门大学经济学院经济研究所、王亚南经济研究院 361005

本文聚焦机关事业单位职工这一长期被经济学界忽略群体的独特特征,从收入不确定性视角出发,研究机关事业单位养老保险改革对过渡期内外中人消费影响的差异。本文首先回顾了机关事业单位养老保险制度历史变迁,着重分析2015年的改革。本... 详细信息

本文聚焦机关事业单位职工这一长期被经济学界忽略群体的独特特征,从收入不确定性视角出发,研究机关事业单位养老保险改革对过渡期内外中人消费影响的差异。本文首先回顾了机关事业单位养老保险制度历史变迁,着重分析2015年的改革。本文构建理论模型,分析改革后养老金待遇的平均值和不确定性对职工储蓄和消费的影响。结果表明,未来较高的待遇水平会降低储蓄,较高的不确定性水平则会增加储蓄。接着,本文使用中国家庭收入调查数据,对理论预期进行验证。实证结果表明,机关事业单位养老保险改革使得过渡期外中人的消费降低。在进行了稳健性检验和平行趋势检验并排除其他可能性解释后,该结果依然成立。进一步分析表明,尽管机关事业单位养老保险改革属于增量改革,但它并未完全抵消由于收入不确定性增加带来的消费抑制效应。本文的结论说明,对于机关事业单位职工来说,即使收入呈现增加趋势,但不确定性的增加会明显抑制消费。

关键词：养老保险改革机关事业单位职工消费不确定性