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Risk Assessment of Secondary Geological Disasters Induced by the Yushu Earthquake

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Journal of Mountain Science 2012年第2期9卷 232-242页

作者： NIU Quanfu CHENG Weiming LIU Yong XIE Yaowen LAN Hengxing cao yanrong College of Earth and Environmental Science Lanzhou UniversityLanzhou 730000China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Gansu Provincial Electric Power Design Institute Lanzhou 730000China

The Yushu Ms 7.1 earthquake occurred on April 14,2010 in Qinghai Province,*** induced a mass of secondary geological disasters,such as collapses,landslides,and debris *** assessment maps are important for geological disaster prevention and mitigation,and also can serve as a guide for post-earthquake ***,a hazard assessment index system of secondary geological disasters in the earthquake region was built in this paper,which was based on detailed analysis of environmental and triggering factors closely related to geological disasters in the study *** technology was utilized to extract and analyze the assessment *** assessment maps of secondary geological disasters were obtained by spatial modeling and overlaying ***,an analysis of the vulnerability of hazard bearing bodies in the area was conducted,important information,such as, population density,percentage of arable land, industrial and agricultural outputs per unit area were regarded as assessment indices to evaluate socioeconomic ***,the risk level of secondary geological disasters of the area was obtained by the formula:Risk=Hazard×Vulnerability. Risk assessment maps were categorized into four levels,including"low","moderate","high"and"very high".These results show that some urban areas are at very high risk,including Jiegu,Chengwen,Xiaxiula and Sahuteng *** research can provide some references and suggestions to improve decisionmaking support for emergency relief and post- earthquake reconstruction in the study area.

关键词： Yushu Earthquake Secondary geological disasters (SGD) Hazard assessment Socio-economic vulnerability Risk assessment

Characteristic Study of Self-Powered Sensors Based on Native Protein Composite Film

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Energy & Environmental Materials 2024年第1期7卷 222-228页

作者： Jiehui Xue Huijing Xiang yanrong Zhang Jun Yang Xia cao Zhonglin Wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Resources Environment and MaterialsSchool of PhysicsScience and TechnologyCenter on Nanoenergy ResearchGuangxi UniversityNanning 530004China Center for Green Innovation School of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083China Research Centre of Information Technology Shenzhen Institute of Information TechnologyShenzhen 518172China School of Chemistry and Biological Engineering University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Georgia Institute of TechnologyAtlanta GA 30332-0245USA

Flexible electronic sensors composed of flexible film and conductive materials play an increasingly important role in wearable and internet information *** has received more and more attention and made some progress over the ***,it is still a great challenge to prepare biocompatible and highly transparent conductive *** white is a pure natural protein-rich *** cellulose has a good compatibility and high transparency,which is an ideal material for flexible ***,we overcome the problem of poor mechanical flexibility and electrical conductivity of protein,and develop a high transparency and good flexibility hydroxypropylmethyl cellulose/egg white protein composite membrane-based triboelectric nanogenerator('X'-TENG).The experimental results show that the flexible pressure sensor based on'X'-TENG has a high sensitivity,fast response speed,and low detection *** can even be used as a touch/pressure sensing artificial electronic *** can also be made into an intelligent waffle keyboard for recording and tracking users of the *** strategy may provide a new way to easily build flexible electronic sensors and move toward practical applications.

关键词： flexible sensors intelligent sensing natural protein-rich material triboelectric nanogenerators

The passivation mechanism of nitrogen ions on the gate leakage current of HfO_2/AlGaN/GaN MOS-HEMTs

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Science China(Physics,Mechanics & Astronomy) 2011年第12期54卷 2170-2173页

作者： BI ZhiWei HAO Yue FENG Qian JIANG TingTing cao yanrong ZHANG JinCheng MAO Wei LU Ling ZHANG Yue Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices School of Microelectronics Xidian University Xi＇an 710071 China State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai 200433 China School of Electronical ＆ Mechanical Engineering Xidian University Xi＇an 710071 China

In this paper, we systematically study the positive gate leakage current in AlGaN/GaN metal-oxide-semiconductor high electron-mobility transistors (MOS-HEMTs) with HfO 2 dielectric using atomic layer deposition (ALD). We observe that the incorporated nitrogen ions will improve the positive gate leakage current of devices obviously, but do not change the reverse gate leakage current. The passivation mechanism of nitrogen ions in oxygen vacancies in HfO 2 is studied by first-principles calculations. It is shown that the gap states of HfO 2 caused by oxygen vacancies increase the positive gate leakage current of MOS-HEMTs. Nitrogen ions passivate the gap states of HfO 2 and decrease the positive gate leakage current but do not effect the reverse gate leakage current.

关键词： AlGaN/GaN MOS-HEMT passivation gate leakage current nitrogen ions

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论有效的课程领导

河南社会科学 2005年第4期13卷 136-138页

作者：曹艳荣华东师范大学课程与教学研究所上海200062

课程领导是一种不同于课程管理的新的管理观。在课程领导的背景下,传统课程管理模式使中小学校长角色陷入了困境,校长角色的转换已成必然之势。要走出困境,中小学校长必须明确办学理念,制定学校发展计划,健全学校的课程开发组织,组织合... 详细信息

课程领导是一种不同于课程管理的新的管理观。在课程领导的背景下,传统课程管理模式使中小学校长角色陷入了困境,校长角色的转换已成必然之势。要走出困境,中小学校长必须明确办学理念,制定学校发展计划,健全学校的课程开发组织,组织合作、向上的教师团队以促进学校课程乃至整个课程体系的发展。

关键词：课程领导校长策略

Google Earth COM API及KML技术在旅游管理信息系统开发中的应用

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地球信息科学学报 2010年第6期12卷 828-834页

作者：马立广曹彦荣中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室北京100101

地理信息技术的发展,推动了旅游业信息化的进展。特别是随着生态环境保护意识的增强,生态旅游的行为和内容也逐步纳入到旅游信息和旅游资源管理范畴中。本文采用Google Earth COM API,基于开放式KML数据标准,探讨开放式地理信息技术在... 详细信息

地理信息技术的发展,推动了旅游业信息化的进展。特别是随着生态环境保护意识的增强,生态旅游的行为和内容也逐步纳入到旅游信息和旅游资源管理范畴中。本文采用Google Earth COM API,基于开放式KML数据标准,探讨开放式地理信息技术在旅游资源管理信息系统中的应用。与读者分享基于KML数据标准,对多元异构的旅游资源数据进行的标准化分类组织和整合的技术方法,介绍使用Google Earth三维数字地球平台提供的免费API快速实现旅游景观资源的可视化,旅游景观资源和信息的快速查询与空间定位功能,以及旅游景观资源的3D自动漫游飞行功能的实现途径和方法,归纳总结开发中的技巧和经验。并实际应用Google Earth COM API与C#.Net语言联合开发了旅游资源管理信息系统,为部门管理旅游资源信息和公众交互访问旅游资源提供便捷的技术平台,也为同类型的旅游资源信息系统的研发提供技术参考。

关键词： Google Earth(GE) COM API KML 旅游信息系统漫游

Fluorine-plasma treated AlGaN/GaN high electronic mobility transistors under off-state overdrive stress

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Chinese Physics B 2022年第11期31卷 493-499页

作者： Dongyan Zhao Yubo Wang Yanning Chen Jin Shao Zhen Fu Fang Liu yanrong cao Faqiang Zhao Mingchen Zhong Yasong Zhang Maodan Ma Hanghang Lv Zhiheng Wang Ling Lv Xuefeng Zheng Xiaohua Ma Beijing Engineering Research Center of High-reliability IC with Power Industrial Grade Beijing Smart-Chip Microelectronics Technology Co.Ltd.Beijing 100192China Beijing Chip Identification Technology Co. Ltd.Beijing 102200China School of Electro-Mechanical Engineering Xidian UniversityXi'an 710071China Key Lab of Wide Band-Gap Semiconductor Materials and Devices Xidian UniversityXi'an 710071China

Influences of off-state overdrive stress on the fluorine-plasma treated AlGaN/GaN high-electronic mobility transistors(HEMTs)are experimentally *** is observed that the reverse leakage current between the gate and source decreases after the off-state stress,whereas the current between the gate and drain *** analyzing those changes of the reverse currents based on the Frenkel–Poole model,we realize that the ionization of fluorine ions occurs during the off-state ***,threshold voltage degradation is also observed after the off-state stress,but the degradations of AlGaN/GaN HEMTs treated with different F-plasma RF powers are *** comparing the differences between those devices,we find that the F-ions incorporated in the GaN buffer layer play an important role in averting ***,suggestions to obtain a more stable fluorine-plasma treated AlGaN/GaN HEMT are put forwarded.

关键词： AlGaN/GaN HEMT fluorine plasma treatment off-state overdrive stress

Degradation of nMOS and pMOSFETs with Ultrathin Gate Oxide Under DT Stress

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Journal of Semiconductors 2008年第11期29卷 2136-2142页

作者：胡仕刚郝跃马晓华曹艳荣陈炽吴笑峰西安电子科技大学微电子学院宽禁带半导体材料与器件教育部重点实验室西安710071

The degradation of device parameters and the degradation of the stress induced leakage current （SILC） of thin tunnel gate oxide under constant direct-tunneling voltage stress are studied using nMOS and pMOSFETs with 1. 4nm gate oxides. Experimental results show that there is a linear correlation between the degradation of the SILC and the degradation of Vth in MOSFETs during different direct-tunneling （DT） stresses. A model of tunneling assisted by interface traps and oxide trapped positive charges is developed to explain the origin of SILC during DT stress.

关键词： threshold voltage interface traps direct tunneling SILC

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Journal of Semiconductors 2007年第5期28卷 665-669页

作者：曹艳荣马晓华郝跃于磊朱志炜陈海峰西安电子科技大学微电子学院宽禁带半导体材料与器件教育部重点实验室西安710071

We investigate the negative bias temperature instability （NBTI） of 90nm pMOSFETs under various temperatures and stress gate voltages （Vg）. We also study models of the time （t） ,temperature （T） ,and stress Vg dependence of 90nm pMOSFETs NBTI degradation. The time model and temperature model are similar to previ- ous studies, with small difference in the key coefficients. A power-law model is found to hold for Vg, which is different from the conventional exponential Vg model. The new model is more predictive than the exponential model when taking lower stress Vg into account.

关键词： NBTI 90nm pMOSFETs model

基于层次分析法的拉市海高原湿地生态系统健康评估

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地球信息科学学报 2011年第2期13卷 234-239页

作者：马立广曹彦荣李新通中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室北京100101 福建师范大学地理科学学院福州350007

本文以云南省丽江市拉市海高原湿地生态系统核心区为研究区域,利用区域生态系统功能监测指标和自然环境及人文活动因素指标,对拉市海高原湿地生态系统的健康状况进行空间综合评估分析。首先,根据当前生态系统的状况和高原湿地生态系统... 详细信息

本文以云南省丽江市拉市海高原湿地生态系统核心区为研究区域,利用区域生态系统功能监测指标和自然环境及人文活动因素指标,对拉市海高原湿地生态系统的健康状况进行空间综合评估分析。首先,根据当前生态系统的状况和高原湿地生态系统的特征,结合湿地保护区开展的系列生态系统功能监测项目及其指标,并充分考虑评估模型的系统性、科学性和实际操作的可行性,构建了拉市海高原湿地生态系统健康评价的指标和指标体系。然后,采用层次分析方法(AHP),融合自然综合指标、人文因素指标在内的生态系统健康综合评价模型,确定6级的生态系统健康评估标准;最后,根据空间评价模型和数据资源,对各个指标权重进行分析计算,得出拉市海高原湿地生态系统的健康状况的空间分布。研究结果表明,拉市海高原湿地的生态系统健康状况良好。按照划定的6级标准,其中,稳定区和较稳定区面积9 358.93hm2,占研究区域总面积的61%,脆弱区和较脆弱区面积为6 058.46hm2,占总面积的39%。整个研究区域内不存在很稳定区和极稳定区,这为高原湿地生态系统的综合管理及发展规划提供了依据。

关键词：高原湿地生态系统层次分析法生态系统健康