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An hourly shallow landslide warning model developed by combining automatic landslide spatial susceptibility and temporal rainfall threshold predictions

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Journal of Mountain Science 2022年第12期19卷 3370-3387页

作者： CAO Yi-ming GUO Wei wu yu-ming LI Lang-ping ZHANG Yi-xing LAN Heng-xing State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing100101China University of Chinese Academy of Sciences Beijing100049China Fujian Meteorological Service Centre Fuzhou350025China School of Geological Engineering and Geomatics Chang’an UniversityXi’an710064China Key Laboratory of Ecological Geology and Disaster Prevention of Ministry of Natural Resources Chang’an UniversityXi’an710064China Tianjin University of Commerce Tianjin300134China

Landslide warning models are important for mitigating landslide *** rainfall threshold model is the most widely used early warning model for predicting rainfall-triggered ***,the rainfall threshold model has been coupled with the landslide susceptibility(LS)model to improve the accuracy of early warnings in the spatial *** coupled models,designed based on a matrix including predefined rainfall thresholds and susceptibility levels,have been used to determine the warning *** predefined classifications inevitably have subjective rainfall thresholds and susceptibility levels,thus affecting the probability distribution information and eventually influencing the reliability of the produced early *** this paper,we propose a novel landslide warning model in which the temporal and spatial probabilities of landslides are coupled without predefining the classified *** temporal probability of landslides is obtained from the probability distribution of rainfall intensities that triggered historical *** spatial probability of landslides is then obtained from the susceptibility probability distribution.A case study shows that the proposed probability-coupled model can successfully provide hourly warning results before the occurrence of a *** all three models successfully predicted the landslide,the probability-coupled model produced a warning zone comprising the fewest grid ***,the probabilitycoupled model produced only 39 grid cells in the warning zone,while the rainfall threshold model and the matrix-coupled model produced warning zones including 81 and 49 grid cells,*** proposed model is also applicable to other regions affected by rainfall-induced landslides and is thus expected to be useful for practical landslide risk management.

关键词： Landslide Hourly warning Temporal probability Spatial probability Rainfall threshold Susceptibility

Electromagnetic scattering of the carbon nanotubes excited by an electric line source

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Chinese Physics B 2012年第1期21卷 268-272页

作者： Wang yue wu Qun wu yu-ming He Xun-Jun Li Le-Wei Department of Electrical Science and Technology Harbin University of Science and TechnologyHarbin 150080China School of Electronics and Information Technology Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Millimeter Wave Southeast UniversityNanjing 210096China School of Electrical&Electronic Engineering Nanyang Technological University639798Singapore Department of Electrical and Computer Engineering National University of Singapore10 Kent Ridge Crescent 119260Singapore

An analytical solution is presented for the electromagnetic scattering from an infinite-length metallic carbon nanotube and a carbon nanotube bundle. The scattering field and scattering cross section are predicted using a modal technique based on a Bessel and Hankel function for the electric line source and a quantum conductance function for the carbon nanotube. For the particular case of an isolated armchair （10, 10） carbon nanotube, the scattered field predicted from this technique is in excellent agreement with the measured result. Furthermore, the analysis indicates that the scattering pattern of an isolated carbon nanotube differs from that of the carbon nanotube bundle of identical index （m, n） metallic carbon nanotubes.

关键词： scattering carbon nanotubes terahertz

A Highly Efficient Aggregation-induced Emission Photosensitizer for Photodynamic Combat of Multidrug-resistant Bacteria

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Chemical Research in Chinese Universities 2021年第1期37卷 150-156页

作者： ZOU Qian WANG Jia-Li wu ming-yu KAM LEE Sin-Ying FENG Shun CHEN Sijie School of Life Science and Engineering Southwest Jiaotong UniversityChengdu610031P.R.China ming Wai Lau Centre for Reparative Medicine Karolinska InstitutetHong KongP.R.China

With the antibiotic abuse and the resulting increased antibiotic resistance,the bacterial infection has posed a serious threat to human *** therapy is an effective tool for treating localized and superficial *** is a promising approach for the treatment of superbugs and with minimal risk of induced antibiotic ***,an isoquinolinium-based photosensitizer,LIQ-TPE,with aggregation-induced emission properties is designed and *** is with high 1O2 generation efficiency and shows efficient antibacterial performance towards both Gram-negative and Gram-positive bacteria,and even methicillin-resistant Staphylococcus aureus(MRSA).LIQ-TPE thus shows great promise as an effective antimicrobial agent to combat the menace of multi-drug resistant bacteria.

关键词： Aggregation-induced emission Photosensitizer Isoquinolinium Photodynamic antibiosis

Optimizing the frequency ratio method for landslide susceptibility assessment: A case study of the Caiyuan Basin in the southeast mountainous area of China

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Journal of Mountain Science 2020年第2期17卷 340-357页

作者： ZHANG Yi-xing LAN Heng-xing LI Lang-ping wu yu-ming CHEN Jun-hui TIAN Nai-man State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China School of Geological Engineering and Geomatics Chang'an UniversityXi'an 710064China

Bivariate statistical analysis of data-driven approaches is widely used for landslide susceptibility assessment, and the frequency ratio(FR) method is one of the most popular. However, the results of such assessments are dominated by the number of classes and bounds of landslide-related causative factors, and the optimal assessment is unknown. This paper optimizes the frequency ratio method as an example of bivariate statistical analysis for landslide susceptibility mapping based on a case study of the Caiyuan Basin, a region with frequent landslides, which is located in the southeast coastal mountainous area of China. A landslide inventory map containing a total of 1425 landslides(polygons) was produced, in which 70% of the landslides were selected for training purposes, and the remaining were used for validationpurposes. All datasets were resampled to the same 5 m × 5 m/pixel resolution. The receiver operating characteristic(ROC) curves of the susceptibility maps were obtained based on different combinations of dominating parameters, and the maximum value of the areas under the ROC curves(AUCs) as well as the corresponding optimal parameter was identified with an automatic searching algorithm. The results showed that the landslide susceptibility maps obtained using optimal parameters displayed a significant increase in the prediction AUC compared with those values obtained using stochastic parameters. The results also showed that one parameter named bin width has a dominant influence on the optimum. In practice, this paper is expected to benefit the assessment of landslide susceptibility by providing an easy-to-use tool. The proposed automatic approach provides a way to optimize the frequency ratio method or other bivariate statistical methods, which can furtherfacilitate comparisons and choices between different methods for landslide susceptibility assessment.

关键词： Automatic optimization Frequency ratio GIS Landslide susceptibility assessment

The spatial econometric analysis of the impact of internet on provincial innovation in China

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Ecological Economy 2014年第1期7卷 10-16页

作者： wu yu-ming School of Business East China University Of Science and Technology

Researches in the impact of the information technology on R&D activities have been noticed since this century to provide a foundation for the relationship between information technology and R&D *** methods of spatial econometrics,this paper examines the impact of Internet on innovation and its spatial spillovers between Chinese provinces over *** paper find that Internet plays an important role in innovative activities,and spatial spillovers of the provinces to its neighbors are positive but weak when spatial effect of endogenous spatial lag variable is taken into consideration.

关键词： innovation internet usage Chinese provinces spatial econometrics

Particle-in-Cell Simulations of Fast Magnetic Reconnection in Laser-Plasma Interaction

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Chinese Physics Letters 2013年第4期30卷 122-125页

作者： ZHANG Ze-Chen LU Quan-ming DONG Quan-Li LU San HUANG Can wu ming-yu SHENG Zheng-ming WANG Shui ZHANG Jie CAS Key Lab of Geoscience Environment University of Science and Technology of ChinaHefei 230026 School of Physics and Optoelectronic Engineering Ludong UniversityYantai 264025 Key Laboratory for Laser Plasmas(MoE and Department of Physics Shanghai Jiao Tong UniversityShanghai 200240

Recent experiments have observed magnetic reconnection in laser-produced high-energy-density(HED)plasma *** perform two-dimensional(2-D)particle-in-cell(PIC)simulations to investigate magnetic reconnection between two approaching HED plasma *** is found that the expanding velocity of the bubbles has a great influence on the process of magnetic *** the expanding velocity is small,a single X line reconnection is ***,when the expanding velocity is sufficiently large,we can observe a plasmoid in the vicinity of the X *** the same time,the structures of the electromagnetic field in HED plasma reconnection are similar to that in Harris current sheet reconnection.

关键词： expanding approaching sufficiently

Post-earthquake Rainfall-triggered Slope Stability Analysis in the Lushan Area

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Journal of Mountain Science 2015年第1期12卷 232-242页

作者： YANG Zhi-hua LAN Heng-xing LIU Hong-jiang LI Lang-ping wu yu-ming MENG yun-shan XU Liang Institute of Geomechanics Chinese Academy of Geological Sciences State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Catastrophe Risk Research Center Yunnan University of Finance and Economics General Geo-environmental Monitoring Station of Sichuan Province

The ＂4.20＂ Lushan earthquake in Sichuan province, China has induced a large amount of geological hazards and produced abundant loose materials which are prone to post-earthquake rainfall- triggered landslides. A detailed landslide inventory was acquired through post-earthquake emergent field investigation and high resolution remote sensing interpretation. The rainfall analysis was conducted using historical rainfall records during the period from 1951 to 2010. Results indicate that the average annual rainfall distribution is heterogeneous and the largest average annual rainfall occurs in yucheng district. The Stability Index MAPping （SINMAP） model was adopted to assess and analyze the post- earthquake slope stability under different rainfall scenarios （light rainfall, moderate rainfall, heavy rainfall, and rainstorm）. The model parameters were calibrated to reflect the significant influence of strong earthquakes on geological settings. The slope stability maps triggered by different rainfall scenarios were produced at a regional scale. The effect of different rainfall conditions on the slope stability is discussed. The expanding trend of the unstable area was quantitatively assessed with the different critical rainfall intensity. They provide a new insight into the spatial distribution and characteristics of post- earthquake rainfall-triggered landslides in the Lushan seismic area. An increase of rainfall intensity results in a significant increase heterogeneous distribution strongly correlated with of unstable area. The of slope instability is the distribution of earthquake intensity in spite of different rainfall conditions. The results suggest that the both seismic intensity and rainfall are two crucial factors for post- earthquake slope stability. This study provides important references for landslide prevention and mitigation in the Lushan area after earthquake.

关键词： Lushan earthquake Rainfall Slopestability SINMAP DEM

Improvement of the Injection and Transport Characteristics of Electrons in Organic Light-Emitting Diodes by Utilizing a NaC1 N-Doped Layer

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Chinese Physics Letters 2014年第4期31卷 178-181页

作者： XIAO Zhi-Hui wu Xiao-ming HUA yu-Lin WANG Li BI Wen-Tao BAI Juan-Juan MU Xue YIN Shou-Gen School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384Key Laboratory of Display Materials and Photoelectric Devices .Ministry of Education Tianjin 300384 Tianjin Key Laboratory of Photoelectric Materials and Devices Tianjin 300384

The injection and transport characteristics of electrons are enhanced by using sodium chloride （NaC1） as an n-type dopant doped into a 4, 7-diphnenyl-1, lO-phe-nanthroline （Bphen） electron-transporting layer, which improves the performance of organic light-emitting diodes （OLEDs）. Meanwhile, a NaCl-doped Bphen layer can effectively influence electrical characteristics of the devices, and significantly improve the current and power efficiency. The turn-on voltage and the operation voltage of the optimal device are decreased drastically from 6.5 V and 10.8 V to 3.3 V and 5 V, respectively, compared with those of the reference device. The maximum current efficiency and power efficiency of the optimal device are 7.0 cd/A and 4.4 Im/W at the current density of 16.70 mA/cm~, which are about I. 7 and 4 times higher than those of the reference device, respectively. Moreover, the enhancement of the injection and transport ability for electrons is attributed not only to the reduced energy barrier between A1 cathode and Bphen, but also to the increased mobility of electrons by the doping effect of NaCl. Therefore, both the electron injection and transport ability are enhanced, which improve the carrier balance in OLEDs and lead to the better device efficiency.

关键词： ORGANIC light emitting diodes SALT DOPING agents (Chemistry) ENERGY consumption ELECTRON mobility

Adverse effects of sympathetic activation should not be neglected during the coronavirus disease 2019 pandemic

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Chinese Medical Journal 2021年第4期134卷 413-414页

作者： Sheng Jin Jing Dai Xu Teng yu-ming wu Department of Physiology Hebei Medical UniversityShijiazhuangHebei 050017China Department of Clinical Diagnostics Hebei Medical UniversityShijiazhuangHebei 050017China Hebei Collaborative Innovation Center for Cardio-Cerebrovascular Disease ShijiazhuangHebei 050017China Key Laboratory of Vascular Medicine of Hebei Province ShijiazhuangHebei 050017China.

The ongoing coronavirus disease 2019(COVID-19)pandemic has resulted in considerable morbidity and mortality ***,the number of infected individuals is rising *** disease is caused by the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)belonging to theβ-coronavirus cluster;this cluster also comprises the viruses causing severe acute respiratory distress syndrome(SARS)and Middle East respiratory syndrome.

关键词： respiratory acute distress