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Rainfall occurrence and its relation to flood damage in China from 2000 to 2015

Journal of Mountain Science 2018年第11期15卷 2492-2504页

作者： WEI Li hu Kai-heng hu xu-dong Key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of Sciences Chengdu 610041China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China University of Chinese Academy of Sciences Beijing 100049 China

China is highly susceptible to flood disasters and subjected to great damage every ***, the flood frequency has exhibited an increasing trend in recent years. Most flood events,including flash floods and river flood, are induced by rainfall. This study investigates annual variations of rainfall occurrence over China during the period from 2000 to 2015 at the national and regional scale using daily rainfall data from the Tropical Rainfall Measuring Mission. The Mann-Kendall test is performed for trend detection, and statistical data of flood damage published by China's government,including destroyed crop area, damaged buildings,direct economic loss, percentage of GDP(gross domestic product), and death toll are correlatively analysed with rainfall occurrences. The results show that storm rain events show the greatest variation among three rainfall types(moderate rain, heavy rain and storm rain). The variation coefficients of rainfall over Northeast China, North China, and Northwest China are the highest, whereas that for Southwest China is the smallest. Moderate rain, heavy rain over Central China, and moderate rain over Southwest China exhibits decreasing trends, whereas the remaining exhibit increasing trends. The correlation between the rainfall occurrences and these flood damage indices at the national scale shows that only direct economic loss has a strong positive correlation with rainfall occurrences, and the other indices have weaker correlations. The correlation is strong in three north regions, except for death toll in Northwest China. In contrast, the correlation between flood damage and rainfall is weak in East China, Central China, Southwest China, and South China. Overall,death toll is strongly correlated with the number of damaged buildings, implying that flood fatalities in China are likely associated with building collapse, and are dominated by specific extreme events. This study can provide a scientific reference for flood management in

关键词： Flood damage Rainfall occurrence Storm rainfall Coefficient of variation

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Quantitative assessment of the impact of earthquakeinduced geohazards on natural landscapes in Jiuzhaigou Valley

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Journal of Mountain Science 2019年第2期16卷 441-452页

作者： hu xu-dong hu Kai-heng ZHANG Xiao-peng WEI Li TANG Jin-bo Key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences University of Chinese Academy of Sciences

Many natural landscapes that lie in high mountain regions are highly susceptible to geological hazards, and their values and integrity are strongly threatened by the hazards. A preliminary framework was proposed to undertake a quantitative assessment of the impact of earthquake-induced geological hazards on the natural landscapes. Four factors reflecting the aesthetic value, ecological value, integrity of landscapes were selected to assess their vulnerability. The impact of earthquake-induced geological hazards on the landscapes is quantitatively expressed as the product of their vulnerability and resilience. The assessment framework was applied to Jiuzhaigou Valley which was severely struck by the Ms 7.0 earthquake on August 8, 2017. Field survey, satellite image interpretation, high-resolution DEM and unmanned aerial vehicle(UAV) reconnaissance were used to retrieve the values of the assessment factors. Twenty seven World Heritage Sites in the valley strongly influenced by the earthquakeinduced geohazards were evaluated. The impact values of two sites of them(Sparking Lake and Nuorilang Waterfall) are up to 8.24 and 4.65, respectively, and their natural landscapes were greatly damaged. The assessment results show a good agreement with the actual damages of the heritage sites.

关键词： Natural landscapes assessment Jiuzhaigou earthquake Earthquake-induced geohazards World Heritage Sites

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Geomorphic effect of debris-flow sediments on the Min River,Wenchuan Earthquake region,western China

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Journal of Mountain Science 2021年第9期18卷 2427-2440页

作者： hu xu-dong ZHOU Li-qin LIU Wei-ming WANG Hao CUI Lei College of Civil Engineering&Architecture China Three Gorges UniversityYichang 443002China Key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of SciencesChengdu 610041China Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China China Renewable Energy Engineering Institute Beijing 100049China

Coseismic landslides and subsequent mobilization of sediment greatly aggravated the landscape evolution and river sedimentation after the Wenchuan *** debris-flow alluvial fan and river morphological index was combined to describe quantitatively the effects of debris-flow sediment on the river characteristics in Longmen *** section of the Min River from the urban area of the Wenchuan county to the epicenter,the Yingxiu town in this county,was selected as the study *** identified 27 river-blocking debrisflows(5 partial-,7 semi-,7 over semi-,and 5 fullyblocking degrees)in the study area via remote sensing interpretation and field *** on this,the response of river longitudinal profile and curvature to debris-flow sediment was qualitatively and quantitatively *** results show that the channel gradient has decreased due to debris-flow aggradation,while two marked peaks in the river steepness index(ksn,represents the relative steepness degree of the channel)changed from 585 m0.9 to 732 m0.9 in zone 1,from 362 m0.9 to 513 m0.9 in zone ***,the main channel has undergone substantial lateral migration with channel width decreased and river curvature *** temporal and spatial variation between river morphological characteristics and debris-flow sediments in short-term provides insights into the internal dynamic role of mass wasting processes in river morphology,which could be served as useful information for natural hazards management to prevent the river from being blocked by episodically debris flows after the earthquake.

关键词： Debris-flow sediment Longitudinal profile River curvature Min River Wenchuan earthquake

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Pseudo-handover based subchannel and power adaptation scheme for interference mitigation in OFDMA two-tier femtocell networks

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The Journal of China Universities of Posts and Telecommunications 2011年第3期18卷 8-15页

作者： LI Hong-jia hu Dan xu Xiao-dong TAO Xiao-feng ZHANG Ping Wireless Technology Innovation Institute Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

In the two-tier femtocell network, a central macroceU is underlaid with a large number of shorter range femtocell hotspots, which is preferably in the universal frequency reuse mode. This kind of new network architecture brings about urgent challenges to the schemes of interference management and the radio resource allocation. Motivated by these challenges, three contributions are made in this paper： 1） A novel joint subchannel and power allocation problem for orthogonal frequency division multiple access （OFDMA） downlink based femtocells is formulated on the premise of minimizing radiated interference of every Femto base station. 2） The pseudo-handover based scheduling information exchange method is proposed to exchange the co-tier and cross-tier information, and thus avoid the collision interference. 3） An iterative scheme of power control and subchannel is proposed to solve the formulated problem in contribution 1）, which is an NP-complete problem. Through simulations and comparisons with four other schemes, better performance in reducing interference and improving the spectrum efficiency is achieved by the proposed scheme.

关键词： femtocell OFDMA interference mitigation resource management power control

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Evaluating the success of engineering disturbed slope eco-restoration in the alpine region, southeast Qinghai-Tibet Plateau, China

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Journal of Mountain Science 2021年第11期18卷 2820-2832页

作者： hu xu-dong GAO Jia-zhen ZHOU Ming-tao SHEN Jian ZHAO Tong-hui Key Laboratory of Geological Hazards on Three Gorges Reservoir Area China Three Gorges UniversityMinistry of EducationYichang 443002China College of Civil Engineering and Architecture China Three Gorges UniversityYichang 443002China DG Hydropower Branch Huadian Tibetan Energy Co.Ltd.Shannan 856200China huadian Tibetan Energy Co. Ltd.Lhasa 850000China

Slope eco-restoration has always received extensive attention as a positive way to reverse ecosystem deterioration derived from human interventions.A simplified frameworkis proposed to undertake a quantitative evaluation of the engineering disturbed slope eco-restoration success in the alpine region,southeast Qinghai-Tibet *** Daguhydropower project that disturbsthe local ecosystem to some certainwas selected as the study *** August 2018,six types of slope(soil,rock,soil-rock,spoil,construction site,hardened)were served as the demonstration test for the slope eco-restoration with two years monitoring in the study ***,the topography,erosion,soil quality,and vegetation were selected as assessment indicators of the ***,combined with the weighting method and the expert panel,the slope eco-restoration quality index(SERQI)was established and applied in the six *** results suggested that the frost-resistant ecological substrate performed well in alpine region,and the SERQI value is in accordance with the actual monitoring level with spoil slope>soil slope>construction site slope>soil-rock slope>rock slope>hardened *** proposed framework could support slope eco-restoration practitioners for making a more objective and quantitative evaluation easily for the post-implementation restoration.

关键词： Slope eco-restoration Restoration evaluation Ecological indicator Hydropower station Qinghai-Tibetan Plateau

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Nuclear medical molecular imaging of tumor angiogenesis： current status and future prospects

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Chinese Medical Journal 2013年第14期126卷 2741-2746页

作者： hu xu-dong XING Li-gang YU Jin-ming Department of Radiation Oncology Key Laboratory of Radiation Oncology of Shandong Province Shandong Tumor Hospital & Institute Jinan Shandong 250117 China Postdoctoral Working Station of Tianjin Medical University Tianjin 300072 China

Objective To review the current status and progress on nuclear medical molecular imaging of angiogenesis. Data sources A literature search was performed in Medline and PubMed published in English up to May 31, 2012. The search terms were molecular imaging, nuclear medicine and angiogenesis. Study selection Articles studying molecular imaging of angiogenesis using radionuclide were selected and reviewed. Results Molecular imaging has been used for studying angiogenesis by targeting integrin aVI33, VEGF/VEGFR, and matrix metalloproteinases （MMPs） with radionuclide-labeled tracers. The technology has been shown to be able to assess the angiogenesis status and/or predict the efficacy of anti-angiogenic therapy. Future directions of the research on the molecular imaging of angiogenesis include development of new tracers with better tumor targeting efficacy, desirable pharmacokinetics, and easy translation to clinical applications. Conclusion Advances in molecular imaging of angiogenesis using radioculcide will make the technology a valuable tool for personalized anti-angiogenesis treatment.

关键词： molecular imaging nuclear medicine angiogenesis

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基于近邻目标区域表征与CVAE的智能汽车测试场景生成方法

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中国公路学报 2024年第3期37卷 170-180页

作者：谈东奎朱波胡旭东合肥工业大学汽车工程技术研究院安徽合肥230009

基于场景的虚拟测试是研发高安全、高可靠智能汽车的必要手段,场景自动生成技术对于智能汽车测试场景库的构建具有重要意义。为此,针对多车动态测试场景,提出一种基于近邻目标区域表征(NORR)和条件变分自编码器(CVAE)的场景生成方法,实... 详细信息

基于场景的虚拟测试是研发高安全、高可靠智能汽车的必要手段,场景自动生成技术对于智能汽车测试场景库的构建具有重要意义。为此,针对多车动态测试场景,提出一种基于近邻目标区域表征(NORR)和条件变分自编码器(CVAE)的场景生成方法,实现复杂测试场景的快速生成以及对生成场景类型的控制。首先,针对高速公路场景特征,提出应用NORR方法对场景情境进行描述,将测试场景中关键车辆目标信息转化为尺度统一的灰度图像。接着,利用HighD自然车辆轨迹数据集提取大量场景片段,经过数据规范化处理后构建出真实场景库。在此基础上,以场景中车辆目标数量为条件参数,训练基于条件变分自编码器的生成模型,能够生成包含8条车辆轨迹的动态测试场景。通过计算生成样本集的匹配误差、覆盖度和不合理性3个指标,检验生成模型在样本真实性、多样性和合理性方面的表现。验证结果显示:①相比随机轨迹采样方法和基于GAN的生成模型,VAE模型生成的样本质量最好,其生成样本集的平均匹配误差小于5.22,覆盖度能达到57.2%,不合理样本比例仅为1.7%;②所提出的NORR方法有助于提高生成模型的场景生成效果;③CVAE模型能够在条件输入和生成结果之间建立关联性,通过调整条件参数可以改变生成场景中车辆目标数量。

关键词：汽车工程测试场景生成条件变分自编码器智能车辆生成模型

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3-D profile measurement for complex micro-structures

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Optoelectronics Letters 2005年第3期1卷 205-208页

作者： hu Chun-guang hu Xiao-dong xu Lin-yan GUO Tong hu Xiao-tang State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University Tianjin 300072 China

Micro-structures 3-D profile measurement is an important measurement content for research on micro-machining and characterization of micro-dimension. In this paper,a new method involved 2-D structure template, which guides phase unwrapping,is proposed based on phase-shifting microscopic *** is fit not only for static measurement, but also for dynamic measurement,especially for motion of MEMS devices.3-D profile of active comb of micro-resonator is obtained by using the *** theoretic precision in out-of-plane direction is better than 0.5 *** in-plane theoretic precision in micro-structures is better than 0.5 μ*** at the edge of micro-structures,it is on the level of micrometer mainly caused by imprecise edge ***,its disadvantages and the following development are discussed.

关键词：微观结构光检测技术三维测量干涉测量

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A Flexible Smart Healthcare Platform Conjugated with Artificial Epidermis Assembled by Three‑Dimensionally Conductive MOF Network for Gas and Pressure Sensing

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Nano-Micro Letters 2025年第2期17卷 601-620页

作者： Qingqing Zhou Qihang Ding Zixun Geng Chencheng hu Long Yang Zitong Kan Biao dong Miae Won Hongwei Song Lin xu Jong Seung Kim State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012People’s Republic of China Department of Chemistry Korea UniversitySeoul 02841Republic of Korea TheranoChem Incorporation Seoul 02856Republic of Korea

The rising flexible and intelligent electronics greatly facilitate the noninvasive and timely tracking of physiological information in telemedicine *** building bionic-sensitive moieties is vital for designing efficient electronic skin with advanced cognitive functionalities to pluralistically capture external ***,realistic mimesis,both in the skin’s three-dimensional interlocked hierarchical structures and synchronous encoding multistimuli information capacities,remains a challenging yet vital need for simplifying the design of flexible logic ***,we construct an artificial epidermal device by in situ growing Cu_(3)(HHTP)_(2) particles onto the hollow spherical Ti_(3)C_(2)T_(x) surface,aiming to concurrently emulate the spinous and granular layers of the skin’s *** bionic Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2) exhibits independent NO_(2) and pressure response,as well as novel functionalities such as acoustic signature perception and Morse code-encrypted message ***,a wearable alarming system with a mobile application terminal is self-developed by integrating the bimodular senor into flexible printed *** system can assess risk factors related with asthmatic,such as stimulation of external NO_(2) gas,abnormal expiratory behavior and exertion degrees of fingers,achieving a recognition accuracy of 97.6%as assisted by a machine learning *** work provides a feasible routine to develop intelligent multifunctional healthcare equipment for burgeoning transformative telemedicine diagnosis.

关键词： Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2)composites NO_(2)/pressure flexible sensors Health-monitoring Machine learning

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数字鉴相技术在单相UPS中的应用

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电源技术 2010年第2期34卷 193-195页

作者：胡旭东安徽理工大学电气与信息工程学院安徽淮南232000

提出了在单相UPS中采用数字化鉴相的方法,进行UPS电源与旁路电源是否同相的判断,避免了由于装配和接线等各种原因引起的两电源反相,从而造成的两电源之间切换失败。该方法在基于DSP的UPS中成功应用,实验证明:该技术操作过程简单,可靠性... 详细信息

提出了在单相UPS中采用数字化鉴相的方法,进行UPS电源与旁路电源是否同相的判断,避免了由于装配和接线等各种原因引起的两电源反相,从而造成的两电源之间切换失败。该方法在基于DSP的UPS中成功应用,实验证明:该技术操作过程简单,可靠性高,提高了UPS的性能。

关键词：数字鉴相 DSP 过零点采样

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