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Spatio-temporal analysis and simulation on shallow rainfall-induced landslides in china using landslide susceptibility dynamics and rainfall I-D thresholds

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Science china earth Sciences 2017年第4期60卷 720-732页

作者： LI WeiYue LIU Chun Marco SCAIONI sun WeiWei CHEN Yu YAO DongJing CHEN Sheng HONG Yang ZHANG KaiHang CHENG GuoDong Institute of Urban Study Shanghai Normal University Shanghai 200234 China Cold and Arid Region environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China College of Surveying and Geo-Informatics Tongji University Shanghai 200234 China Department of Architecture Built Environment and Construction Engineering Politecnico Milano Milano 20133 Italy College of Architectural Engineering Civil Engineering and Environment Ningbo University Ningbo 315211 China Shandong Academy of Building Research Jinan 250031 China Department of Geography Shanghai Normal University Shanghai 200234 China School of Atmospheric Sciences Sun Yat-sen University Guangzhou 510275 China Key Laboratory of Beibu Gulf environmental Evolution and resources Utilization Guangxi Teachers Education University Nanning 530001 China School of Civil Engineering and environmental Sciences University of Oklahoma OK 73074 USA Department of Hydraulic Engineering Tsinghua University Beijing 100084 China Institute of Tourism Shanghai Normal University Shanghai 200234 China

An empirical simulation method to simulate the possible position of shallow rainfall-induced landslides in china has been *** study shows that such a simulation may be operated in real-time to highlight those areas that are highly prone to rainfall-induced landslides on the basis of the landslide susceptibility index and the rainfall intensity-duration(I-D) ***,the study on landslide susceptibility in china is *** entire territory has been classified into five categories,among which high-susceptibility regions(Zone 4-'High' and 5-'Very high') account for 4.15%of the total extension of ***,rainfall is considered as an external triggering factor that may induce landslide ***-time satellite-based TMPA3B42 products may provide real rainfall spatial and temporal patterns,which may be used to derive rainfall duration time and *** using a historical record of 60 significant past landslides,the rainfall I-D equation has been *** rainfall duration time that may trigger a landslide has resulted between 3 hours and 45 *** combination of these two aspects can be exploited to simulate the spatiotemporal distribution of rainfall-induced landslide hazards when rainfall events exceed the rainfall I-D thresholds,where the susceptibility category is 'high' or 'very high'.This study shows a useful tool to be part of a systematic landslide simulation methodology,potentially providing useful information for a theoretical basis and practical guide for landslide prediction and mitigation throughout china.

关键词： Surface and subsurface runoff Runoff-produced physical and chemical deposits Precipitated salts and water circulation Groundwater supply mechanism Badain Jaran Desert

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Nano-sized graphitic carbon in authigenic tube pyrites from offshore southwest Taiwan, South china Sea, and its implication for tracing gas hydrate

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Chinese Science Bulletin 2011年第19期56卷 2037-2043页

作者： ZHANG Mei sun XiaoMing XU Li XU HuiFang KONISHI Hirom LU Yang LU HongFeng WU ZhongWei Department of earth Sciences Sun Yat-sen University Guangzhou 510275 China School of Marine Sciences Sun Yat-sen University Guangzhou 510275 China guangdong Provincial Key Laboratory of Marine resources and Coastal Engineering Guangzhou 510275 China Department of Geosciences University of Wisconsin Madison W153706 USA guangzhou Marine Geological Survey Ministry of Land and Resources Guangzhou 510075 China

Gas hydrates are a significant energy resource and are usually detected by bottom simulating reflection and submarine geochemical anomalies. Authigenic minerals are related to gas hydrates, with carbonates, sulfates and sulfides being important tracing minerals. Authigenic tubular pyrites were collected from offshore southwest Taiwan in the South china Sea, and were investigated by scanning electron microscopy(SEM) and high-resolution transmission electron microscopy (HRTEM). Authigenic tubular pyrite was composed of framboidal pyrite, within which nanosized graphitic carbon of low crystallinity was discovered. The graphitic carbon coexisted with pyrite and had a texture similar to carbon nanotubes and nanocones, indicating that they likely precipitated from carbon supersaturated C-H-O fluid. Pyrite may act as a catalyst for the conversion of CH 4 to C. The discovery of nanosized graphitic carbon in pyrite indicated it was deposited in sediments that were supersaturated with methane fluid. Thus, nanosized graphitic carbon may be another tracing species for submarine gas hydrates. The discovery of nanosized graphitic carbon deposited in a low temperature environment will enlighten our understanding of the laboratory synthesis and industrial production of graphitic carbon.

关键词：海底天然气水合物碳纳米管石墨碳中国南海黄铁矿台湾地区西南海上

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基于深度学习的镜下矿石矿物的智能识别实验研究

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岩石学报 2018年第11期34卷 3244-3252页

作者：徐述腾周永章广东省地质过程与矿产资源探查重点实验室广州510275 中山大学地球环境与地球资源研究中心广州510275 中山大学地球科学与工程学院广州510275

矿石矿物鉴定的智能化是智能地质学和智能矿床学的基础技术之一。计算机视觉技术和深度学习理论使矿石矿物鉴定的智能化成为可能。本研究基于深度学习系统Tensor Flow,以吉林夹皮沟金矿和河北石湖金矿的黄铁矿、黄铜矿、方铅矿、闪锌矿... 详细信息

矿石矿物鉴定的智能化是智能地质学和智能矿床学的基础技术之一。计算机视觉技术和深度学习理论使矿石矿物鉴定的智能化成为可能。本研究基于深度学习系统Tensor Flow,以吉林夹皮沟金矿和河北石湖金矿的黄铁矿、黄铜矿、方铅矿、闪锌矿等硫化物矿物为例,设计有针对性的Unet卷积神经网络模型,有效自动提取矿相显微镜下矿石矿物的深层特征信息,实现镜下矿石矿物智能识别与分类。实验显示,模型在训练过程中,随着训练次数的增加,模型精度在不断增大,损失函数不断减小;经过3000个批处理之后,模型精度和损失函数基本趋于稳定。训练出的模型对测试集中的显微镜镜下矿石矿物照片的识别成功率均高于90%,说明实验所建立的模型,具有很好的图像特征提取能力,能完成镜下矿石矿物智能识别的任务。

关键词：卷积神经网络算法深度学习矿物自动识别地质大数据智能地质学机器学习

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Insights into Free and Conjugated Forms of Neonicotinoid Insecticides in Human Serum and Their Association with Oxidative Stress

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environment & Health 2023年第2期1卷 121-129页

作者： Ya-Nan Yao Shiming Song Yingyan Huang Kurunthachalam Kannan Hongwen sun Tao Zhang School of environmental Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275China School of Chemistry and environment Jiaying UniversityMei Zhou 514015China guangzhou Hexin Instrument Co. Ltd.Guangzhou 510530China Wadsworth center New York State Department of HealthAlbanyNew York 12137United States MOE Key Laboratory of Pollution Processes and environmental Criteria College of Environmental Science and EngineeringNankai UniversityTianjin 300071China

Following exposure,neonicotinoid insecticides(NEOs)can be metabolized by both Phase Ⅰ and Phase Ⅱ reactions catalyzed by human cytochrome P450 ***,toxicities of parent NEOs and their metabolites are still unclear,and little is known about biotransformation rates and pathways of NEOs in *** this study,98 serum samples collected in china were analyzed for free,conjugated and total forms of six parent NEOs(i.e.,acetamiprid(ACE),imidacloprid(IMI),clothianidin(CLO),thiacloprid(THD),thiamethoxam(THM),and dinotefuran(DIN))and four metabolites(i.e.,N-desmethyl-acetamiprid(N-dm-ACE),1-methyl-3-(tetrahydro-3-furylmethyl)(DIN-U),5-hydroxy-imidacloprid(5-OH-IMI),olefin-imidacloprid(Of-IMI)).NEOs and their metabolites were detected in all serum samples,and the total median concentrations of free,conjugated,and total forms of 10 NEOs were 2.04,2.01,and 5.12 ng/mL,*** forms of NEOs accounted for only half(53%)of the total forms of *** on the profiles of Phase Ⅰ and Phase Ⅱ metabolites of NEOs in serum,it was found that age is a determinant in Phase Ⅰmetabolism of DIN and Phase Ⅱ metabolism of *** Phase Ⅱmetabolites of NEOs are associated with oxidative DNA damage,and the conjugated forms of IMI,DIN,and 5-OH-IMI in serum were significantly positively correlated with oxidative ***,the amount of NEOs present in conjugated forms in human serum was determined to document the existence of a considerable proportion of free forms of these insecticides.

关键词： Neonicotinoid insecticides metabolites conjugated forms free forms oxidative stress human serum

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基于水资源需求场理论的需水驱动力影响分析

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水科学进展 2018年第3期29卷 357-364页

作者：陈晓宏王佳雯何艳虎杨冰杨杰中山大学水资源与环境研究中心广东广州510275 广东省华南地区水安全调控工程技术研究中心广东广州510275 华南地区水循环与水安全广东普通高校重点实验室广东广州510275

为了解决传统水资源需求驱动因素分析中存在难以直观反映城市空间相互作用的问题,运用水资源需求场理论,分析地区水资源需求空间特征;结合社会经济势能探讨水资源需求的驱动因素,并以2014年广东省用水、社会经济数据为例进行计算与分析... 详细信息

为了解决传统水资源需求驱动因素分析中存在难以直观反映城市空间相互作用的问题,运用水资源需求场理论,分析地区水资源需求空间特征;结合社会经济势能探讨水资源需求的驱动因素,并以2014年广东省用水、社会经济数据为例进行计算与分析。研究表明:(1)广东省水资源需求场呈现以珠三角地区为中心向外辐射的分布特征,各城市周围的场强方向指向各城市中心点;(2)水资源需求场的叠加会改变城市的场强大小与方向;(3)社会经济势能与水资源需求场相关系数达0.924。结果证实,社会经济是水资源需求的主要驱动力;在其驱动下,水资源在空间上向发达地区与城市中心流动。该结果可为水资源需求的准确预测、水资源管理提供基础支撑。

关键词：水资源需求场需水驱动力水荷社会经济势能

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大气PM_(1)短期暴露与老年人心绞痛住院的关联研究

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公共卫生与预防医学 2024年第2期35卷 6-11页

作者：许露曦许瑞君叶韵韶林巧绚孙宏田琪刘跃伟中山大学公共卫生学院广东广州510080 广西壮族自治区疾病预防控制中心环境卫生与地方病防制所广西南宁530028 广州市卫生健康技术鉴定和人才评价中心广东广州510080 江苏省疾病预防控制中心环境与健康所江苏南京210009

目的定量评估大气亚微米颗粒物(PM_(1))短期暴露与老年人心绞痛住院的关联。方法以2016—2019年因心绞痛在广州市医疗机构住院的46 687名老年患者为研究对象开展病例交叉研究,从中国高分辨率大气污染物数据集(CHAP)获取广州市大气PM_... 详细信息

目的定量评估大气亚微米颗粒物(PM_(1))短期暴露与老年人心绞痛住院的关联。方法以2016—2019年因心绞痛在广州市医疗机构住院的46 687名老年患者为研究对象开展病例交叉研究,从中国高分辨率大气污染物数据集(CHAP)获取广州市大气PM_(1)浓度网格数据,根据家庭住址评估研究对象的PM_(1)暴露水平,利用条件logistic回归模型分析PM_(1)与老年人心绞痛住院之间的暴露-反应关系。结果 2016—2019年间,研究对象心绞痛住院当天(lag 0)PM_(1)的平均暴露水平为21.0±11.5μg/m^(3)。主模型分析结果显示,PM_(1)暴露(lag 0)与老年人心绞痛住院风险存在正向关联,暴露水平每增加10μg/m^(3),老年人因心绞痛住院的风险增加1.31%(95%CI:0.05%~2.59%);调整O_(3)的双污染物模型结果提示,PM_(1)短期暴露与老年人心绞痛住院风险之间的关联保持稳定。根据以上模型结果估计,广州市2016—2019年间可归因于大气PM_(1)暴露的超额住院占总住院人次数的2.46%(95%CI:0.09%~4.76%),超额住院人次数为1 539(95%CI:54~2 976)。分层分析结果显示,性别、年龄和季节对上述关联无显著的效应修饰作用。结论大气PM_(1)短期暴露与老年人心绞痛住院风险升高有关。

关键词：颗粒物老年人心绞痛 PM_(1) 住院

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青光眼中神经退行性病变的机制研究和治疗进展

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眼科学报 2024年第8期39卷 402-408页

作者：曹迎雪麦小妹(综述) 石乐徐明明孙泽惠柳夏林易薇(审校) 中山大学中山眼科中心眼病防治全国重点实验室广东省眼科视觉科学重点实验室广州510060

青光眼是全球第一大不可逆性致盲性眼病,影响全球7000多万人,其特征是视网膜神经节细胞的退行性病变。到2040年,预计全球青光眼患者人数将增加至1.12亿,其中约10%的人至少一只眼睛失明。由高眼压诱发、多种致病因素导致的视网膜神经节... 详细信息

青光眼是全球第一大不可逆性致盲性眼病,影响全球7000多万人,其特征是视网膜神经节细胞的退行性病变。到2040年,预计全球青光眼患者人数将增加至1.12亿,其中约10%的人至少一只眼睛失明。由高眼压诱发、多种致病因素导致的视网膜神经节细胞死亡是青光眼进展过程中视功能损伤的主要病理过程,也是青光眼病程中视功能损害不可逆的重要原因。目前降眼压治疗是唯一的干预疗法,然而其仍然不能完全遏止视网膜神经节细胞进行性损伤,并且既往病程造成的视神经损伤不可逆转。探索青光眼进程中视网膜神经节细胞退行性改变的直接致病因素,寻找关键的治疗靶点,以及开发新的具有神经保护作用的治疗药物,具有重要意义。文章回顾了近年来青光眼中视网膜神经节细胞退行性病变的机制和治疗的新进展,强调了神经血管单元的改变在青光眼发病机制中的重要作用和干预价值。同时,靶向代谢的药物应用、抑制早期炎症反应和减少氧化应激,辅以营养和运动支持等可能延缓和抑制神经退行性病变的发生,起到神经保护作用。未来青光眼发病机制的研究重点仍然在眼压之外的致病因素上,从血流、代谢和免疫串扰的病理环境中发掘对神经退行性改变重要的致病因素并进行干预治疗具有广阔的前景。在多种动物模型中验证干预手段的神经保护作用,也有望提高青光眼神经保护的临床转化成功率,以拓展青光眼的治疗理念与药物选择。

关键词：青光眼视网膜神经节细胞高眼压神经保护治疗进展

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Re-Os dating of auriferous pyrite from the Zhenyuan super-large gold deposit in Ailaoshan gold belt,Yunnan Province,Southwestern china

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Chinese Science Bulletin 2012年第26期57卷 4578-4586页

作者： SHI GuiYong sun XiaoMing PAN WeiJian HU BeiMing QU WenJun DU AnDao LI Chao School of Marine Sciences Sun Yat-sen UniversityGuangzhou 510275China Department of earth Sciences Sun Yat-sen UniversityGuangzhou 510275China guangdong Provincial Key Laboratory of Marine resources and Coastal Engineering Guangzhou 510006China National Research center of Geoanalysis Beijing 100037China

Zhenyuan gold deposit is the largest super large gold deposit in the Ailaoshan gold belt,but its precise mineralization age is still ***-Os isotopic age of the auriferous pyrite from the Zhenyuan gold deposit was determined by using a high-resolution inductively coupled plasma mass spectrometry(HR-ICP-MS).The pyrite samples were decomposed in carius tubes,Os was separated by distillation and Re was extracted by acetone,*** results show that the Re-Os isochron age is 229±38 Ma(MSWD=2.0,confidence level is 95%),with an initial 187 Os/188 Os value of 0.68±0.24 and a corresponding Os value of 442±*** Re/Os ratios of the pyrite vary from 40.8 to *** data suggest that at least one important ore-forming event was occurred during Indosinian epoch,and the ore-forming materials probably derived from mixed sources of crustal and mantle,while the later *** Ailaoshan composite orogen experienced complicated evolutional processes,including formation of Precambrian-Early Paleozoic basement,subduction and orogenesis of Late Paleozoic era,collisional orogenesis of Late Hercynian-Indosinain epoch,and extensional or striking orogenesis of Yanshainan-Cenozoic *** polycycle tectonic evolution and magmatism in this area caused multi-stage and superposition metallization characteristics of the Zhenyuan gold deposit:the mineralization probably occur mainly during the Indosinian collisional orogeny,while the minor gold ores of altered granite-porphyry and altered lamprophyre may be formed in the late superposition metallization.

关键词： Re-Os同位素年龄超大型金矿床含金黄铁矿中国西南地区哀牢山金矿带电感耦合等离子体质谱碰撞造山作用

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变化环境下流域水-碳平衡演化研究综述

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水利学报 2021年第3期52卷 300-309页

作者：段凯孙阁刘宁中山大学土木工程学院广东广州510275 南方海洋科学与工程广东省实验室(珠海) 广东珠海519082 Eastern Forest environmental Threat Assessment center USDA Forest ServiceResearch Triangle ParkNC 27709

流域水量平衡与碳平衡通过植物光合作用与蒸散发过程紧密相联。在全球环境变化的背景下,研究流域水-碳平衡的耦合关系与对变化环境的响应规律对于发展生态水文科学具有重要科学意义,也可为区域水安全保障、生态系统服务功能评价、气候... 详细信息

流域水量平衡与碳平衡通过植物光合作用与蒸散发过程紧密相联。在全球环境变化的背景下,研究流域水-碳平衡的耦合关系与对变化环境的响应规律对于发展生态水文科学具有重要科学意义,也可为区域水安全保障、生态系统服务功能评价、气候变化适应性对策制定等提供科学支撑。本文从水循环与碳循环要素的监测、水-碳耦合关系的量化和模拟、变化环境对水-碳平衡的干扰、流域尺度上水-碳平衡演化规律识别与归因等方面对相关研究进展进行综述,探讨当前的研究热点、面临的问题与挑战、以及未来的发展趋势。

关键词：水-碳耦合流域水-碳平衡变化环境研究进展

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FGOALS-g3 Model Datasets for CMIP6 Flux-Anomaly-Forced Model Intercomparison Project

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Advances in Atmospheric Sciences 2020年第10期37卷 1093-1101页

作者： Yaqi WANG Zipeng YU Pengfei LIN Hailong LIU Jiangbo JIN Lijuan LI Yanli TANG Li DONG Kangjun CHEN Yiwen LI Qian YANG Mengrong DING Yao MENG Bowen ZHAO Jilin WEI Jinfeng MA and Zhikuo sun State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China International center for Climate and environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China School of Atmospheric Sciences Guangdong Province Key Laboratory for Climate Change and Nature Disaster StudiesSun Yat-sen UniversityGuangzhou 510275China

The Flux-Anomaly-Forced Model Intercomparison Project(FAFMIP)is an endorsed Model Intercomparison Project in phase 6 of the Coupled Model Intercomparison Project(CMIP6).The goal of FAFMIP is to investigate the spread in the atmosphere–ocean general circulation model projections of ocean climate change forced by increased CO2,including the uncertainties in the simulations of ocean heat uptake,global mean sea level rise due to ocean thermal expansion and dynamic sea level change due to ocean circulation and density *** FAFMIP experiments have already been conducted with the Flexible Global Ocean–Atmosphere–Land System Model,gridpoint version 3.0(FGOALS-g3).The model datasets have been submitted to the earth System Grid Federation(ESGF)***,the details of the experiments,the output variables and some baseline results are *** with the preliminary results of other models,the evolutions of global mean variables can be reproduced well by *** simulations of spatial patterns are also consistent with those of other models in most regions except the North Atlantic and the Southern Ocean,indicating large uncertainties in the regional sea level projections of these two regions.

关键词： FAFMIP CMIP6 global mean sea level rise dynamic sea level change

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