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A scientometric review of biochar research in the past 20 years(1998-2018)

Biochar 2019年第1期1卷 23-43页

作者： Ping Wu Syed Tahir Ata-Ul-Karim Bhupinder Pal Singh Hailong Wang Tongliang Wu Cun Liu Guodong Fang Dongmei Zhou Yujun Wang wenfu chen Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China NSW Department of Primary Industries Elizabeth Macarthur Agricultural InstituteMenangleNSW 2568Australia Biochar Engineering Technology Research Center of Guangdong Province School of Environment and Chemical EngineeringFoshan UniversityFoshanGuangdong 528000China Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province Zhejiang A&F UniversityHangzhouZhejiang 311300China Biochar Engineering and Technology Research Center of Liaoning Province Rice Research InstituteAgronomy CollegeShenyang Agricultural UniversityShenyang 110866LiaoningChina

Biochar is the carbon-rich product obtained from the thermochemical conversion of biomass under oxygen-limited *** has attained extensive attention due to its agronomical and environmental benefits in *** work adopts the scientometric analysis method to assess the development trends of biochar research based on the literature data retrieved from the Web of Science over the period of *** analysing the basic characteristics of 6934 publications,we found that the number of publications grew rapidly since *** on a keyword analysis,it is concluded that scholars have had a fundamental recognition of biochar and preliminarily found that biochar application had agronomic and environmental benefits during the period of *** clustering results of keywords in documents published during 2011-2015 showed that the main research hotspots were“biochar production”,“biochar and global climate change”,“soil quality and plant growth”,“organic pollutants removal”,and“heavy metals immobilization”.While in 2016-2018,beside these five main research hotspots,“biochar and composting”topic had also received greater attention,indicating that biochar utilization in organic solid waste composting is the current research ***,updated reactors(e.g.,microwave reactor,fixed-bed reactor,screw-feeding reactor,bubbling fluidized bed reactor,etc.)or technologies(e.g.,solar pyrolysis,Thermo-Catalytic Reforming process,liquefaction technology,etc.)applied for efficient energy production and modified biochar for environmental remediation have been extensively studied *** findings may help the new researchers to seize the research frontier in the biochar field.

关键词： Biochar CiteSpace Research hotspots Composting Energy Modification

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Overstory functional groups indicate the legacy of land use in a secondary tropical forest in southwestern China

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Journal of Forestry Research 2024年第5期35卷 91-105页

作者： Yun Deng wenfu Zhang Min Cao Jinlong Dong Hui chen Xiaobao Deng Jiajia Liu Xiaoyang Song Shangwen Xia Liqing Sha Shengdong Yuan Luxiang Lin CAS Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303People’s Republic of China Center for Plant Ecology Core Botanical GardensChinese Academy of SciencesMengla 666303People’s Republic of China National Forest Ecosystem Research Station at Xishuangbanna Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303People’s Republic of China Department of Life Sciences Fudan UniversityShanghai 570228People’s Republic of China Department of Life Sciences University of Chinese Academy of SciencesBeijing 100049People’s Republic of China

Anthropogenic disturbances are widespread in tropical forests and influence the species composition in the ***,the impacts of historical disturbance on tropical forest overstory recovery are unclear due to a lack of disturbance data,and previous studies have focused on understory *** this study,the purpose was to deter-mine the influence of historical disturbance on the diver-sity,composition and regeneration of overstory species in present *** the 20-ha Xishuangbanna tropical sea-sonal rainforest dynamics plot in southwestern China,the historical disturbance boundaries were delineated based on panchromatic photographs from *** that drove species clustering in the overstory layer(DBH≥40 cm)were analyzed and the abundance,richness and composition of these species were compared among different tree groups based on multiple regression tree *** coefficient of variation of the brightness value in historical panchro-matic photographs from 1965 was the primary driver of spe-cies clustering in the overstory *** abundance and richness of overstory species throughout the regeneration process were similar,but species composition was always *** the proportion of large-seeded and vigorous-sprouting species showed no significant differ-ence between disturbed and undisturbed forests in the tree-let layer(DBH<20 cm),the difference became significant when DBH *** findings highlight that historical disturbances have strong legacy effects on functional group composition in the overstory and the recovery of overstory species was *** group composi-tion can better indicate the dynamics of overstory species replacement during secondary succession.

关键词： Historical disturbance Legacy effects Secondary forests Overstory species Functional groups

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提高架空光缆工程质量应注意的几个问题

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中国有线电视 2001年第7期 21-22页

作者：陈文富福建省仙游县广播电视事业局 351200

架空光缆是目前县、乡光纤联网建设的主要手段。只有优良的光缆施工质量才能确保光缆网长期高效地安全运行，并为今后广电光缆网开展多功能业务打下良好的基础。由于县级台一般不具备光纤焊接设备及操作人员，光缆一旦断裂，重新熔接费... 详细信息

架空光缆是目前县、乡光纤联网建设的主要手段。只有优良的光缆施工质量才能确保光缆网长期高效地安全运行，并为今后广电光缆网开展多功能业务打下良好的基础。由于县级台一般不具备光纤焊接设备及操作人员，光缆一旦断裂，重新熔接费用大，信号中断时间长，影响面积大、区域广，给广播电视网络的正常运行带来极大的危害。因此，如何提高架空光缆工程质量，是广电人应当关注的问题。联系实际经验，提出以下几点注意事项，仅供参考。1 关于光缆路由的选择原则所选的路由应当安全合理。为便于光缆的敷设施工和今后光缆线路的维护，应尽量选择沿公路、村道走向的路由；此外，还应与城市规划、交通管理等部门充分沟通，以便及时了解城市的规划、道路的变更等信息，从而确定合理的路由。否则，今后的城市规划、道路变更将不得不迁移已建好的杆路。因此，做好沟通工作可避免今后不必要的经济损失。根据以往的经验和本地区的地理特点，有线电视联网光缆杆路架设可采取以下措施： (1)在规划设计之前，组织技术人员对本地区的人口分布情况进行详细调查，并对本地地质、地形情况进行周密勘察，确定有线电视联网光缆杆路的路由方案。 (2)杆路与公路应保持一定的距离，防止车辆碰撞光缆杆路。 (3)要加强杆路的安全措施，尽量避免或减少狂风暴雨对杆路的破坏。在杆路建设中，每公里应安装2～3个防凌拉、3～4个人字拉，超过30°的角杆也都应安装终端拉线和吊线保护。如1998年夏的一次暴雨，冲倒了仙游县郊尾镇地段10多根电杆，光缆被拉断，造成市送光纤信号中断，并殃及县送郊尾、枫亭两镇(2万多终端用户)的信号全部中断，经全力抢修3天才恢复开通。因此，杆路应尽量靠山边或避风避水地势架设。 (4)要做好杆路的防电、防雷保护措施。一是向厂家订购有避雷装置的电杆，施工中每5根电杆设一根避雷杆。二是地锚拉线杆尾应连接避雷针。三是吊线接地要良好。四是跨越电力线除装电力保护套外，与电力线的距离应大于2.5 m，两端电杆的吊线要引入地线，进机房的吊线至少要做5根杆的接地引线，防止电力线断落在光缆吊线上对光缆的损害。例1999年10月，园庄镇和赖店镇的新周村先后投诉无信号，经查原因是途中一根220 V电力线坠落在光缆吊线上，与吊线打火，造成光缆烧断长度约20 cm，致使一镇一村近7 000用户几天看不上有线电视节目。 (5)按地势高低安排电杆的长短，地势低的栽长杆，地势高的栽短杆，尽量保持吊线的水平度。跨越公路的杆，要用8 m以上的长杆，杆路周围1m内不应有树枝。

关键词：架空光缆工程质量通信光缆

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A Transformer Replacement Decision Method Based on Probability Assessment of Failure Rate

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Energy and Power Engineering 2017年第4期9卷 748-755页

作者： Gang Liang Shengwei Li Yan Qi Jing Cao Yi Hao wenfu chen State Grid Tianjin Dongli Electric Power Supply Company Tianjin China State Grid Tianjin Economic Research Institute Tianjin China Tianjin Electric Power Research Institute Tianjin China State Grid Tianjin Dispatching and Control Center Tianjin China

Reasonable probability assessment of transformer failure rate (FR) is a critical reference to the transformer replacement work. At present, the lack of support theory for transformer replacement usually causes reliability and economy issues for power companies. For this reason, a transformer replacement decision method based on probability assessment of FR is proposed. Firstly, a first order model of transformer paper degradation is proposed. Then, the Weibull Distribution is used by Monte Carlo Simulation (MCS) to generate the variations of Degree of Polymerization (DP) along with time based on the historical data, and the transformer FR is determined. When the FR is higher than a pre-defined threshold value, the transformer should be replaced for reliability purpose. Finally, the effectiveness of the proposed method for the transformer replacement decision is verified by a typical engineering application.

关键词： Transformer Replacement Probability Assessment Weibull Distribution Degree of Polymerization

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溪洛渡特高拱坝混凝土保温技术研究与应用

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水力发电学报 2019年第4期38卷 213-223页

作者：樊启祥邬昆陈文夫中国长江三峡集团有限公司北京100038

大坝混凝土裂缝多为表面裂缝,深层裂缝和贯穿裂缝也多由此发展而成,加强表面保温是有效防止混凝土表面裂缝的重要措施。溪洛渡特高拱坝建设过程中,通过技术标准确定、仿真模拟研究、施工方案优化、标准工艺建设等系统性保温技术研究,提... 详细信息

大坝混凝土裂缝多为表面裂缝,深层裂缝和贯穿裂缝也多由此发展而成,加强表面保温是有效防止混凝土表面裂缝的重要措施。溪洛渡特高拱坝建设过程中,通过技术标准确定、仿真模拟研究、施工方案优化、标准工艺建设等系统性保温技术研究,提出了适应特高拱坝表面防裂需要的大坝混凝土个性化、精细化全坝保温工艺要求,经现场全方位实时监测和质量检查,溪洛渡拱坝混凝土保温实施效果明显,有效控制了大坝混凝土表面开裂的风险。

关键词：水电工程特高拱坝表面保温保温材料仿真模拟

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Population Genomic Analysis and De Novo Assembly Reveal the Origin of Weedy Rice as an Evolutionary Game

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Molecular Plant 2019年第5期12卷 632-647页

作者： Jian Sun Dianrong Ma Liang Tang Minghui Zhao Guangchen Zhangh Wenjia Wang Jiayu Song Xiang Li Zimeng Liu Wenxing Zhang Quan Xu Yuncheng Zhou Jianzhong Wu Toshio Yamamoto Fei Dai Yan Lei Song Li Gang Zhou Hongkun Zheng Zhengjin Xu wenfu chen Rice Research Institute Shenyang Agricultural UniversityShenyangChina College of Information and Electrical Engineering Shenyang Agricultural UniversityShenyangChina Institute of Crop Science National Agriculture and Food Research OrganizationIbarakiJapan lnstitute of Plant Science and Resources Okayama UniversityOkayamaJapan Department of Agronomy Zhejiang Key Lab of Crop GermplasmZhejiang UniversityHangzhouChina Biomarker Technologies Corporation BeijingChina

Crop weediness,especially that of weedy rice(Oryza sativa ***),remains *** rice possesses robust ecological adaptability;however,how this strain originated and gradually formed proprietary genetic features remains unclear?Here,we demonstrate that weedy rice at Asian high latitudes(WRAH)is phylogenetically well defined and possesses unselected genomic characteristics in many divergence regions between weedy and cultivated *** also identified novel quantitative trait loci underlying weedy-specific traits,and revealed that a genome block on the end of chromosome 1 is associated with rice *** identify the genomic modifications underlying weedy rice evolution,we generated the first de novo assembly of a high-quality weedy rice genome(WR04-6),and conducted a comparative genomics study between WR04-6 with other rice reference *** lines of evidence,including the results of demographic scenario comparisons,suggest that differentiation between weedy rice and cultivated rice was initiated by genetic improvement of cultivated rice and that the essence of weediness arose through semi-domestication.A plant height model further implied that the origin of WRAH can be modeled as an evolutionary game and indicated that strategy-based selection driven by fitness shaped its genomic diversity.

关键词： weedy rice population genomics de novo assembly comparative genomics evolutionary game

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Ice-covered Environmental Adaptability Assessment for Overhead Contact System in High-speed Railways

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Chinese Journal of Electrical Engineering 2024年第2期10卷 70-79页

作者： Huan Zhang wenfu Wei Like Pan Zefeng Yang Guizao Huang Yuxin Liu Xing chen Ziqian Yang Guangning Wu School of Electrical Engineering Southwest Jiaotong UniversityChengdu 611756China National Rail Transit Electrification and Automation Engineering Technology Research Center Southwest Jiaotong UniversityChengdu 611756China China Academy of Railway Sciences Corporation Limited Beijing 100000China

High-speed trains rely on pantograph-catenary systems(PCSs)to collect electrical energy from power ***,the dynamic interaction between the pantograph and the catenary system may become mismatched once ice accumulates on the overhead *** frequent arcing may occur within the PCS during train operation,posing an unpredictable threat to operational ***,it is crucial to evaluate the ability of overhead contact system(OCS)to withstand ice-covered variability during line desgin.A new strategy is proposed to evaluate the adaptive performance of an OCS under various icing ***,a dynamic model considering icing conditions is constructed to simulate the interaction within the *** different OCS structures with various icing thicknesses are *** parameters of the contact force within the PCS and proportion of high-possibility arcing moments are *** dependence of the contact force on the icing thickness and pantograph displacement has been illustrated in the form of cloud ***,the OCS sensitivity coefficient is calculated,and ice-covered environmental adaptability assessments for the five different OCS structures are compared.

关键词： Overhead contact system environmental adaptability sensitivity coefficient icing thickness contact force

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东北粳稻发展趋势及展望

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中国稻米 2021年第5期27卷 1-4页

作者：唐亮陈温福沈阳农业大学/北方超级粳稻育种教育部重点实验室沈阳110866

随着国民经济发展和人民生活水平的不断提高,中国稻米市场对粳米的需求持续增长。东北稻区的粳稻生产直接影响着我国粳米市场的稳定和我国人民的口粮安全,承载着国家粮食安全和社会稳定的历史重任。合理、适度地发展东北粳稻生产,增加... 详细信息

随着国民经济发展和人民生活水平的不断提高,中国稻米市场对粳米的需求持续增长。东北稻区的粳稻生产直接影响着我国粳米市场的稳定和我国人民的口粮安全,承载着国家粮食安全和社会稳定的历史重任。合理、适度地发展东北粳稻生产,增加优质粳稻总产量,对于确保我国口粮绝对安全和社会稳定具有重要意义。文章分析了东北粳稻发展历史、现状,提出了存在的问题和今后的对策。

关键词：东北粳稻发展趋势口粮安全

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北方粳稻新品种培育与发展

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中国稻米 2022年第5期28卷 79-81页

作者：唐亮陈温福沈阳农业大学/北方超级粳稻育种教育部重点实验室沈阳110866

北方粳稻生产直接影响我国粳米市场稳定,承载着国家粮食安全和社会稳定的历史重任。种子是粮食生产的基础,粮食丰收则需要优质的种子。近几十年来,北方粳稻新品种培育极大促进了北方粳稻生产的快速发展。新形势下,北方粳稻新品种培育应... 详细信息

北方粳稻生产直接影响我国粳米市场稳定,承载着国家粮食安全和社会稳定的历史重任。种子是粮食生产的基础,粮食丰收则需要优质的种子。近几十年来,北方粳稻新品种培育极大促进了北方粳稻生产的快速发展。新形势下,北方粳稻新品种培育应采用“高产与优质并重、轻简高效广适高抗相结合、常规育种和生物育种相结合、商业化育种与公益性育种并重”的策略,把优质的北方粳稻种子牢牢攥在自己手里,筑牢国家粮食安全之基。

关键词：北方粳稻品种培育育种策略

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国有企业员工身份平等与忠诚度——以皖北煤电为例

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国有经济评论 2013年第1期5卷 55-66页

作者：陈文府安徽大学经济学院

本文以皖北煤电为例,首次实证检验了员工身份平等与忠诚度之间的关系,从一个重要侧面探讨了用工"双轨制"转变为"单轨制"后,员工身份差异消除能否增进效率问题。研究结果显示,员工身份平等的实践,显著改善了曾经为非正式工的员工忠诚度,... 详细信息

本文以皖北煤电为例,首次实证检验了员工身份平等与忠诚度之间的关系,从一个重要侧面探讨了用工"双轨制"转变为"单轨制"后,员工身份差异消除能否增进效率问题。研究结果显示,员工身份平等的实践,显著改善了曾经为非正式工的员工忠诚度,企业改制前存在的身份差异对员工忠诚度的影响不再显著,用工"双轨制"转变为"单轨制"能够增进效率。

关键词：身份平等忠诚度用工“双轨制” 用工“单轨制”

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