检索结果-南通市图书馆

Debris flow and landslide hazard mapping and risk analysis in China

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2012年第3期6卷 306-313页

作者： Xilin LIU chengjun YU Peijun shi Weihua FANG School of Geography and Planning Sun Yat-Sen UniversityGuangzhou 510275China Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education Beijing Normal UniversityBeijing 100875China

This paper assesses the hazardousness, vulnerability and risk of debris flow and landslide in China and compiles maps with a scale of 1：6000000, based on Geographical Information System （GIS） technology, hazard regionalization map, socioeconomic data from 2000. Integrated hazardousness of debris flow and landslide is equivalent to the sum of debris flow hazardousness and landslide hazardousness. Vulnerability is assessed by employing a simplified assessment model. Risk is calculated by the following formula： Risk = Hazardousness × Vulnerability. The analysis results of assessment of hazardousness, vulnerability and risk show that there are extremely high risk regions of 104 km2, high risk regions of 283008 km2, moderate risk regions of 3161815 km2, low risk regions of 3299604km2, and extremely low risk regions of 2681709 km2. Exploitation activities should be prohibited in extremely high risk and high risk regions and restricted in moderate risk regions. The present study on risk analysis of debris flow and landslide not only sheds new light on the future work in this direction but also provides a scientific basis for disaster prevention and mitigation policy making.

关键词： debris flow and landslide hazards hazardousness vulnerability risk assessment and analysis GIS mapping

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

分子筛三杆阀故障分析与处理

冶金动力 2017年第9期 40-42页

作者：蒋小林袁苑石成军吴继强陈旭马鞍山钢铁股份有限公司气体销售分公司安徽马鞍山243000

通过对大型制氧机关键阀门,分子筛进口三杠阀卡阻故障的分析、判断,处理过程的总结,提出同类故障出现的原因及处置方法。

关键词：分子筛进口三杆阀卡阻捕雾网漏斗形排水管外接仪表气

在线全文

学校读者我要写书评

暂无评论

分子筛运行故障处理和升级改造

冶金动力 2018年第11期 24-27页

作者：蒋小林袁苑石成军陈韬吴继强马鞍山钢铁股份有限公司气体销售分公司安徽马鞍山243000

详细介绍了分子筛长期运行后,出现CO2穿透现象及应对的方法;描述了制氧机更换新型分子筛项目的实施过程,达到提升分子筛性能及降低机组能耗的目的。

关键词：制氧机分子筛CO2穿透筛网破损应急措施新型分子筛

在线全文

学校读者我要写书评

暂无评论

高速公路对乡村振兴支撑作用研究

陕西国防职教研究 2023年第1期33卷 24-27页

作者：史成君陕西国防工业职业技术学院陕西西安710300

党的二十大提出要全面推进乡村振兴,统筹乡村基础设施、扎实推动乡村产业振兴。交通运输业作为国民经济的基础性、战略性产业和重要的服务型行业,必将对乡村振兴产生深刻影响,对于广大西部地区欠发达地区而言,高速公路就是致富路,完善... 详细信息

党的二十大提出要全面推进乡村振兴,统筹乡村基础设施、扎实推动乡村产业振兴。交通运输业作为国民经济的基础性、战略性产业和重要的服务型行业,必将对乡村振兴产生深刻影响,对于广大西部地区欠发达地区而言,高速公路就是致富路,完善高速路网对于乡村振兴具有重要意义。本文以某西部省份为研究对象,基于灰色理论建立模型探究了高速公路支撑乡村振兴的具体形式,并对该省未来建设高速公路和进一步推进乡村振兴提出了相关建议。

关键词：乡村振兴高速公路灰色理论

Patterns and determinants of wood physical and mechanical properties across major tree species in China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2015年第6期58卷 602-612页

作者： ZHU JiangLing shi Yue FANG LeQi LIU XingE JI chengjun College of Urban and Environmental Sciences Peking University Institute of Botany Chinese Academy of Sciences School of Physics and Technology Wuhan University International Center for Bamboo and Rattan

The physical and mechanical properties of wood affect the growth and development of trees, and also act as the main criteria when determining wood usage. Our understanding on patterns and controls of wood physical and mechanical properties could provide benefits for forestry management and bases for wood application and forest tree breeding. However, current studies on wood properties mainly focus on wood density and ignore other wood physical properties. In this study, we established a comprehensive database of wood physical properties across major tree species in China. Based on this database, we explored spatial patterns and driving factors of wood properties across major tree species in China. Our results showed that(i) compared with wood density, air-dried density, tangential shrinkage coefficient and resilience provide more accuracy and higher explanation power when used as the evaluation index of wood physical properties.(ii) Among life form, climatic and edaphic variables, life form is the dominant factor shaping spatial patterns of wood physical properties, climatic factors the next, and edaphic factors have the least effects, suggesting that the effects of climatic factors on spatial variations of wood properties are indirectly induced by their effects on species distribution.

关键词： wood density shrinkage coefficient resilience geographic pattern environmental factors

Flexible supercapacitors

在线全文

学校读者我要写书评

暂无评论

Particuology 2013年第4期11卷 371-377页

作者： Shan shi chengjun Xu Cheng Yang Jia Li Hongda Du Baohua Li Feiyu Kang City Key Laboratory of Thermal Management Engineering and Materials Graduate School at ShenzhenTsinghua University State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science & EngineeringTsinghua University

Flexible supercapacitors show a great potential for applications in wearable, miniaturized, portable, large- scale transparent and flexible consumer electronics due to their significant, inherent advantages, such as being flexible, lightweight, low cost and environmentally friendly in comparison with the current energy storage devices. In this report, recent progress on flexible supercapacitors, flexible electrodes and electrolytes is reviewed. In addition, the future challenges and opportunities are discussed.

关键词： Flexible supercapacitorFlexible electrodeCarbon network

Vaccination of poultry successfully eliminated human infection with H7N9 virus in China

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2018年第12期61卷 1465-1473页

作者： Xianying Zeng Guobin Tian Jianzhong shi Guohua Deng chengjun Li Hualan Chen State Key Laboratory of Veterinary Biotechnology Harbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin 150069China

The H7 N9 viruses that emerged in China in 2013 were nonpathogenic in chickens but mutated to a highly pathogenic form in early 2017 and caused severe disease outbreaks in chickens. The H7 N9 influenza viruses have caused five waves of human infection, with almost half of the total number of human cases(766 of 1,567) being reported in the fifth wave, raising concerns that even more human infections could occur in the sixth wave. In September 2017, an H5/H7 bivalent inactivated vaccine for chickens was introduced, and the H7 N9 virus isolation rate in poultry dropped by 93.3% after vaccination. More importantly,only three H7 N9 human cases were reported between October 1, 2017 and September 30, 2018, indicating that vaccination of poultry successfully eliminated human infection with H7 N9 virus. These facts emphasize that active control of animal disease is extremely important for zoonosis control and human health protection.

关键词： H7N9 influenza virus evolution vaccination human infection elimination

在线全文

学校读者我要写书评

暂无评论

稀土氧化物对中间包覆盖剂粘性特征的影响

特殊钢 2003年第3期24卷 29-30页

作者：王德永刘承军王新丽史培阳朱传运姜茂发姚永宽东北大学沈阳110004 南京钢铁集团有限公司南京210035

稀土氧化物对中间包覆盖剂和实验室合成渣粘度的影响的试验表明 ,当稀土氧化物含量不大于 10 %时 ,具有降低覆盖剂高温粘度的功能 ,当稀土氧化物含量接近 2 0 %时。

关键词：稀土氧化物中间包覆盖剂粘度炼钢连铸

斜坡式重力储能系统机械与电气联合仿真的多软件协同建模方法

在线全文

学校读者我要写书评

暂无评论

储能科学与技术 2024年第9期13卷 3266-3276页

作者：刘大猛牟雪鹏石博豪陈巨龙王斌罗晨钟承君陈思哲贵州电网有限责任公司电网规划研究中心贵州贵阳550000 广东工业大学自动化学院广东广州510006

重力储能具有安全性高、成本低、寿命长、存储能量无衰减、建设周期短及环境友好等优势。其中,斜坡式重力储能可以利用山体自然落差降低建设成本,并减少占用平地资源,是长时大容量储能领域的重要前瞻性技术之一。然而,斜坡式重力储能系... 详细信息

重力储能具有安全性高、成本低、寿命长、存储能量无衰减、建设周期短及环境友好等优势。其中,斜坡式重力储能可以利用山体自然落差降低建设成本,并减少占用平地资源,是长时大容量储能领域的重要前瞻性技术之一。然而,斜坡式重力储能系统具有机械与电气动态高度耦合的特点,现有仿真模型难以完整描述其动态特性。针对该问题,本工作提出了一种斜坡式重力储能系统机械与电气联合仿真的多软件协同建模方法。首先,采用三维机械设计软件Solidworks建立包括斜坡、轨道、载重小车和质量块的机械系统框架模型;然后,将Solidworks中建立的模型导入多体动力学仿真软件Adams,并建立载重小车与链传动机构的联系,获得机械系统完整模型;最后,将Adams中的机械模型导入Simulink,并建立与电气模型的联系,从而获得机电联合仿真模型。将所提出的多软件协同仿真模型与Simulink独立仿真模型,在电网正常和异常工况下分别进行仿真对比,结果表明多软件协同仿真模型能够更加全面地描述斜坡式重力储能系统的动态特性。因此,多软件协同仿真模型能够更好地支撑对斜坡式重力储能的功率特性分析、安全性评估和机械参数优化设计等工作。

关键词：斜坡式重力储能机电联合仿真建模多软件协同仿真建模