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Has the Prediction of the South China Sea Summer Monsoon Improved Since the Late 1970s?

Journal of Meteorological Research 2016年第6期30卷 833-852页

作者： FAN yi FAN ke1 TIAN Baoqiang Nansen–Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & Technology

Based on the evaluation of state-of-the-art coupled ocean-atmosphere general circulation models （CGCMs） from the ENSEMBLES （Ensemble-based Predictions of Climate Changes and Their Impacts） and DEME- TER （Development of a European Multimodel Ensemble System for Seasonal to Interannual Prediction） projects, it is found that the prediction of the South China Sea summer monsoon （SCSSM） has improved since the late 1970s. These CGCMs show better skills in prediction of the atmospheric circulation and precipitation within the SCSSM domain during 1979-2005 than that during 1960-1978. Possible reasons for this improvement are investigated. First, the relationship between the SSTs over the tropical Pacific, North Pacific and tropical Indian Ocean, and SCSSM has intensified since the late 1970s. Meanwhile, the SCSSM-related SSTs, with their larger amplitude of interannual variability, have been better predicted. Moreover, the larger amplitude of the interannual variability of the SCSSM and improved initializations for CGCMs after the late 1970s contribute to the better prediction of the SCSSM. In addition, considering that the CGCMs have certain limitations in SCSSM rainfall prediction, we applied the year-to-year increment approach to these CGCMs from the DEMETER and ENSEMBLES projects to improve the prediction of SCSSM rainfall before and after the late 1970s.

关键词： South China Sea summer monsoon prediction Ensemble-based Predictions of Climate Chan-ges and Their Impacts Development of a European Multimodel Ensemble System for Seasonalto Interannual Prediction year-to-year increment prediction approach

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A Content-Based Parallel Image Retrieval System on Cluster Architectures

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Wuhan University Journal of Natural Sciences 2004年第5期9卷 665-670页

作者： ZHOUBing SHENJun-yi PENGQin-ke SchoolofElectronicsandInformationEngineering Xi＇anJiaotongUniversityXi＇an710019ShaanxiChina

We propose a content-based parallel image retrieval system to achieve high responding ability. Our system is developed on cluster architectures. It has several retrieval. servers to supply the service of content-based image retrieval. It adopts the Browser/Server (B/S) mode. The users could visit our system though web pages. It uses the symmetrical color-spatial features (SCSF) to represent the content of an image. The SCSF is effective and efficient for image matching because it is independent of image distortion such as rotation and flip as well as it increases the matching accuracy. The SCSF was organized by M-tree, which could speedup the searching procedure. Our experiments show that the image matching is quickly and efficiently with the use of SCSF. And with the support of several retrieval servers, the system could respond to many users at mean time. key words content-based image retrieval - cluster architecture - color-spatial feature - B/S mode - task parallel - WWW - Internet CLC number TP391 Foundation item: Supported by the National Natural Science Foundation of China (60173058)Biography: ZHOU Bing (1975-), male, Ph. D candidate, reseach direction: data mining, content-based image retrieval.

关键词： content-based image retrieval cluster architecture color-spatial feature B/S mode task parallel WWW Internet

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Si-Nanocrystals with Bimodal Size Distribution in Evenly Annealed SiO Revealed with Raman Scattering

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Chinese Physics Letters 2012年第1期29卷 202-205页

作者： ke Wei-Wei FENG Xue HUANG yi-Dong State key Laboratory of Integrated Optoelectronics Department of Electronic EngineeringTsinghua UniversityBeijing 100084

The size distribution of Si-nanocrystals(Si-ncs)in evenly annealed SiO is investigated with transmission electron microscopy(TEM),x-ray diffraction(XRD),and Raman *** groups of Si-ncs with very different most probable diameters are identified,where one is>6nm and the other one is10nm)and it can be revealed clearly for all samples by Raman spectra with two components(~500cm^(-1)and~520cm^(-1)).The results of XRD show the average *** experimental results indicate that the common assumption of Si-nc size distribution with single most probable diameter is not always proper and the possible mechanisms are briefly discussed.

关键词： temperature. scattering. effect.

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基于自研光谱仪的痕量气体光解速率测量研究

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光谱学与光谱分析 2025年第1期45卷 15-23页

作者：李浩然曾议朱磊窦科刘志宏常振江宇司福祺中国科学院合肥物质科学研究院安徽光学精密机械研究所环境科学与技术重点实验室安徽合肥230031 中国科学技术大学科学岛分院安徽合肥230026 合肥大学生物食品与环境学院安徽合肥230601

光解速率及其测量技术最早由德国科学家提出,21世纪初Metcon公司开发了光解速率测量仪,该技术在国内得到关注,部分高校和公司对光解速率测量系统开展了研究和开发。国外产品一般体积较大,价格昂贵。国内产品中光谱仪、接收器等核心器件... 详细信息

光解速率及其测量技术最早由德国科学家提出,21世纪初Metcon公司开发了光解速率测量仪,该技术在国内得到关注,部分高校和公司对光解速率测量系统开展了研究和开发。国外产品一般体积较大,价格昂贵。国内产品中光谱仪、接收器等核心器件仍依赖于国外进口,易受国外技术封锁影响。在我国“十四五”国家重点研发计划中“大气与土壤、地下水污染综合治理”重点专项对化学气候综合站检测技术与装备需求引导下,研制了测量大气物质光解速率的光谱仪系统,并满足其核心部件国产化的要求。系统采用自主设计的小型光谱仪作为核心部件,配合各向均匀响应的光学接收器,经实验室光学定标后测得各种物质的光解速率。该系统工作波段为285~430 nm,时间分辨率可达0.1 s,可测物质包括NO_(2)、HONO、HCHO、H_(2)O_(2)等,与国外进口测量仪器对比,各气体物质光解速率的测量误差小于5%,相关性均超过0.93。采用该系统在合肥市董铺岛对大气中气体光解速率开展了长时间的连续监测。对NO_(2)光解速率变化趋势以及NO_(2)光解速率与浓度间的相关性进行分析,发现光解反应与驱动光化反应的能量密切相关,晴天的光解速率数值明显高于阴天与雨天。发现NO_(2)光解速率与浓度的积分曲线间存在一种经验公式,相关性大于0.9,可通过测量NO_(2)光解速率对NO_(2)浓度的累积量进行估计。该系统实现了核心部件的国产化,整体结构简单、便携,方便外场试验安装的同时,降低成本,提高经济性。研究为大气污染综合监测治理提供数据支撑,对各地区的环境监测及污染预防具有参考意义。

关键词：光解速率光谱仪辐亮度光学接收器

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Peer-to-Peer Short-Term Sharing on the Rental Platform

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Journal of Systems Science and Systems Engineering 2022年第6期31卷 705-727页

作者： ke Li Li Xiao Tsinghua-Berkeley Shenzhen Institute Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

Peer-to-peer(P2P)rental markets connect independent owners and price sensitive *** of P2P rental platform include home sharing,such as Airbnb and Ma yi Duan Zu,and carsharing,such as Uber and *** platform gains profit by asking owners and renters to pay the commission *** decide whether to share their durable goods,and if so,how much time to *** this paper,we study the short-term sharing behavior and decision making process in the P2P rental ***,we consider two settings:owner makes the rental price decision;and the platform makes the rental price *** former one applies to the home sharing industry,while the latter one applies to the carsharing *** addition,we consider two market conditions:supply shortage case(supply is less than demand);and supply surplus case(supply is larger than demand).We show that,platform earns a higher profit under supply surplus(or shortage)case if the potential owner ratio is high(or low).In addition,we show that,under supply shortage case,owner's optimal earnings and plaform's optimal profit do not change when we compare the setting where owner makes pricing decision with the setting where platform makes pricing ***,we numerically illustrate how the social welfare changes with respect to the owner's *** find that it is first decreasing,then increasing,and finally decreasing in owner's ratio.

关键词： P2P market price commission rate bilateral platform sharing economy

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Metal-free direct C(sp^(3))-H functionalization of 2-alkylthiobenzoic acid to access 1,3-benzooxathiin-4-one

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Chinese Chemical Letters 2021年第1期32卷 146-149页

作者： ke Yang yi Li Mengjie Song Shengfei Dai Zheng-yi Li Xiaoqiang Sun Jiangsu key Laboratory of Advanced Catalytic Materials&Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China

Metal-free direct α-C(sp^(3))-H intramolecular cyclization of 2-alkylthiobenzoic acid in the presence of Selectfluor is *** novel strategy provides a facile and efficient method to access important 1,3-benzooxathiin-... 详细信息

关键词： Metal-free C(sp^(3))-H functionalization Selectfluor 1,3-Benzooxathiin-4-one Organic synthesis

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AdaPIP: Adaptive picture-in-picture guidance for 360° film watching

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Computational Visual Media 2024年第3期10卷 487-503页

作者： yi-Xiao Li Guan Luo yi-ke Xu Yu He Fang-Lue Zhang Song-Hai Zhang Department of Computer Science and Technology Tsinghua UniversityBeijingChinaand Beijing National Research Center for Information Science and Technology(BNRist)Tsinghua UniversityBeijingChina key Laboratory of Space Utilization Technology and Engineering Center for Space UtilizationChinese Academy of SciencesBeijingChina Victoria University of Wellington WellingtonNew Zealand

360°videos enable viewers to watch freely from different directions but inevitably prevent them from perceiving all the helpful *** mitigate this problem,picture-in-picture(PIP)guidance was proposed using preview windows to show regions of interest(ROIs)outside the current view *** identify several drawbacks of this representation and propose a new method for 360° film watching called *** enhances traditional PIP by adaptively arranging preview windows with changeable view ranges and *** addition,AdaPIP incorporates the advantage of arrow-based guidance by presenting circular windows with arrows attached to them to help users locate the corresponding ROIs more *** also adapted AdaPIP and Outside-In to HMD-based immersive virtual reality environments to demonstrate the usability of PIP-guided approaches beyond 2D *** user experiments on 2D screens,as well as in VR environments,indicate that AdaPIP is superior to alternative methods in terms of visual experiences while maintaining a comparable degree of immersion.

关键词： 360°videos picture-in-picture(PIP) virtual reality(VR) visual guidance

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The role of natural products in regulating pyroptosis

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Traditional Medicine Research 2020年第3期5卷 167-177页

作者： yi-Zhen Bai ke-Wu Zeng State key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing 100191China

In recent years,large numbers of novel cell death types have been reported such as autophagic death,paraptosis,mitosis,oncosis and *** a new type of proinflammatory programmed cell death,pyroptosis has attracted increasing attentions gradually,and its morphological characteristics and molecular mechanisms are significantly different from other cell death types such as necrosis and *** research groups have demonstrated the association between pyroptosis and various human diseases including immunological disease,cancer,atherosclerosis,infectious disease,and cardiovascular and cerebrovascular *** products are small molecules synthetized in organisms including primary and secondary *** products are important sources of modern innovative drugs discovery and can be used as key tools to explore the molecular mechanism of cell *** aim of this study is to review the molecular mechanisms and pathways of pyroptosis,and to categorize and conclude research results on the correlation between different natural products and pyroptosis in recent *** this study,a total of 39 papers were enrolled in *** molecular pathways and mechanisms of pyroptosis were clearly *** types of natural products,their sources,effects,mechanisms and therapeutic potentials are categorized and *** is showed that a variety of natural products and pyroptosis have close *** negatively or positively affect or act on different positions of pyroptosis inflammatory pathways,indicating that they may have certain potential therapeutic effects on pyroptosis-related ***,a relatively new way of cell death,is closely associated with a variety of *** products can have obvious effects on the process of pyroptosis as potential sources of new ***-depth studies using natural products to investigate pyroptosis will help to enhance our understandings of human diseases and establish effec

关键词： Natural products Pyroptosis Programmed cell death Gasdermin-D Inflammasome.

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Equivalent Continuum Model of Rock Mass with Arbitrary Fractures

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Journal of Shanghai Jiaotong university(Science) 2013年第3期18卷 293-297页

作者： WANG ying-yi LI ke HUANG Xing-chun Chinese Underwater Technology Institute Shanghai Jiaotong University Shanghai 200231 China School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai 200240 China China Merchants Chongqing Communications Research & Design Institute Co. Ltd. Chongqing 400067 China

The constitutive model and equivalent deformation modulus of an arbitrary column in representative elementary volume （REV） of fractured rock mass are derived. The deformation of fractured rock mass is com- posed of the rock part and the fracture part. The elasto-visco-plastic property is considered in this model. For the convenience in engineering practice, the complex elasto-visco-plastic model and its equivalent modulus are degraded, and tbe rock is taken as an elastic body. By statistical analysis of the geometric positions of the column and the fracture, the equivalent modulus of rock mass with arbitrary fractures is obtained.

关键词： fractured rock mass representative elementary volume (REV) elasto-visco-plastic constitutive model eouivalent continuum model

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Guest editorial of “Intelligent logistics and supply chains”

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Advances in Manufacturing 2014年第2期2卷 95-96页

作者： yi Wang Jan Ola Strhagen ke-Sheng Wang School of Material The University of ManchesterManchester UK Knowledge Discovery Laboratory Department of Production and Quality EngineeringNorwegian University of Science and TechnologyTrondheimNorway

Information and communication technology （ICT） has been considered as an enabling tool for having more effective and efficient operations in the management of logistics and supply chains for many years. Various information and communication technologies are used to improve perfor- mance of the logistics and supply chain network, such as ＂data mining＂, ＂radio frequency identification （RFID）＂, ＂machine learning＂, ＂smart transportation＂. While ICT systems are vital components in logistics and supply chains, their successful management rests on intelligent and inte- grated decision making throughout the logistics network. Intelligent decision technologies are applied to collect and store real-time data and then analyze and interpret the data and information of product, inventory, manufacturing and sales to discover useful knowledge for making better operation and management decisions. Advanced simulation and optimization of planning and scheduling systems are also used for improvement of inventory, production, pro-curement, and distribution planning. Intelligent agents can communicate with different partners in the supply chain, assist in collecting information, share product information, negotiate prices, and distribute alerts throughout the logis- tics and supply chains networks.

关键词： Guest editorial of Intelligent logistics and supply chains RFID

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