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Land-surface processes and summer-cloud-precipitation characteristics in the Tibetan Plateau and their effects on downstream weather: a review and perspective

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National science Review 2020年第3期7卷 500-515页

作者： Yunfei Fu Yaoming Ma Lei Zhong Yuanjian Yang Xueliang Guo Chenghai wang Xiaofeng Xu Kun Yang Xiangde Xu Liping Liu guangzhou Fan Yueqing Li Donghai wang school of Earth and Space sciences University of Science and Technology of China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of Sciences CAS Center for Excellence in Tibetan Plateau Earth sciences Chinese Academy of Sciences university of Chinese Academy of sciences CAS Center for Excellence in Comparative Planetology school of Atmospheric Physics Nanjing University of Information Science and Technology State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences China Meteorological Administration school of Atmospheric sciences Lanzhou University Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System Science Tsinghua University Chengdu university of information technology Institute of Plateau Meteorology CMA school of Atmospheric sciences Sun Yat-sen University

Correct understanding of the land-surface processes and cloud-precipitation processes in the Tibetan Plateau(TP) is an important prerequisite for the study and forecast of the downstream activities of weather systems and one of the key points for understanding the global atmospheric movement. In order to show the achievements that have been made, this paper reviews the progress on the observations for the atmospheric boundary layer, land-surface heat fluxes, cloud-precipitation distributions and vertical structures by using ground-and space-based multiplatform, multisensor instruments and the effect of the cloud system in the TP on the downstream weather. The results show that the form drag related to the topography, land–atmosphere momentum and scalar fluxes is an important part of the parameterization process. The sensible heat flux decreased especially in the central and northern TP caused by the decrease in wind speeds and the differences in the ground-air temperatures. Observations show that the cloud and precipitation over the TP have a strong diurnal variation. Studies also show the compressed-air column in the troposphere by the higher-altitude terrain of the TP makes particles inside clouds vary at a shorter distance in the vertical direction than those in the non-plateau area so that precipitation intensity over the TP is usually small with short duration, and the vertical structure of the convective precipitation over the TP is obviously different from that in other regions. In addition, the influence of the TP on severe weather downstream is preliminarily understood from the mechanism. It is necessary to use model simulations and observation techniques to reveal the difference between cloud precipitation in the TP and non-plateau areas in order to understand the cloud microphysical parameters over the TP and the processes of the land boundary layer affecting cloud, precipitation and weather in the downstream regions.

关键词： Tibetan Plateau land-surface processes cloud-precipitation characteristics downstream effects

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Multi-agent mobile networking observation experiment at the air-sea interface of ocean eddy

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science china Earth sciences 2024年第10期67卷 3083-3097页

作者： Yi ZHANG Dongxiao wang Li ZHOU Chunhua QIU Yunfei ZHANG Zhiliang DENG Biao ZHANG Yunping LIU Yeqiang SHU Fenghua ZHOU Danian LIU Zhengqiu ZHANG school of Marine sciences Sun Yat-Sen UniversityZhuhai 519082China Southern Marine science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China school of Marine technology and Geomatics Jiangsu Ocean UniversityLianyungang 222005China Zhuhai Yunzhou Intelligent technology Co. Ltd.Research and Design CenterZhuhai 519000China school of Automation Nanjing University of Information Science&TechnologyNanjing 210044China school of Marine sciences Nanjing University of Information Science&TechnologyNanjing 210044China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

Current climate forecasting has advanced to the stage of investigating mesoscale air-sea interactions. Recent studies have identified significant structural differences between the cores and edges of mesoscale eddies;however, the effects of these structural variations on air-sea fluxes and the Marine Atmospheric Boundary Layer(MABL) remain underexplored. Traditional observations often fail to capture the detailed structures of eddies, necessitating enhanced observations at high spatiotemporal resolution for mesoscale eddies. To address this, efforts have been made to develop multi-agent platforms and expendable air-sea interface observation technologies. A task-oriented observation scheme was developed to monitor the spatial characteristics of mesoscale eddies. The South china Sea(SCS) is rich in mesoscale eddies with rapid motion changes, requiring enhanced observations of the air-sea interface using multi-agent mobile networking. An anticyclonic eddy was observed in the eastern region of the Xisha Islands in the SCS, and we examined variations in air-sea fluxes across different regions within the eddy.

关键词： Multi-agent Mobile networking Mesoscale eddy Air-sea interface Collaborative observation

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Organic-inorganic hybrid piezotronic bipolar junction transistor for pressure sensing

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Microsystems & Nanoengineering 2024年第3期10卷 229-244页

作者： Emad Iranmanesh Zihao Liang Weiwei Li Congwei Liao Shunyu Jin Chuan Liu Kai wang Shengdong Zhang Charalampos Doumanidis Gehan A.J.Amaratunga Hang Zhou Guangdong Provincial Key Laboratory of In-Memory Computing Chips School of Electronic and Computer EngineeringPeking University Shenzhen Graduate SchoolShenzhen 518055P.R.China school of Mechanical Engineering Guangdong Technion-Israel Institute of TechnologyShantou 515063P.R.China State Key Laboratory of Microelectronics Device and Integrated technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029P.R.China Hefei National Research Center for Physical sciences at the Microscale University of Science and Technology of ChinaHefei 23000PR China school of Electronics and information technology Sun Yat-sen UniversityNo.132 East Waihuan RoadGuangzhou 510006P.R.China Department of Mechanical Aerospaceand Biomedical EngineeringUniversity of South AlabamaShelby Hall3128MobileAL 36688USA Electrical Engineering Division Department of EngineeringUniversity of Cambridge9 JJ Thomson AvenueCambridge CB30FAUnited Kingdom Zhejiang university International CampusHainingChina

With the rapid development of the Internet of Things(IoTs),wearable sensors are playing an increasingly important role in daily monitoring of personal health and *** signal-to-noise-ratio has become the most critical performance factor to *** enhance it,on the one hand,good sensing materials/devices have been employed;on the other hand,signal amplification and noise reduction circuits have been ***,most of these devices and circuits work in an active sampling mode,requiring frequent data acquisition and hence,entailing high-power *** this scenario,a flexible and wearable event-triggered sensor with embedded signal amplification without an external power supply is of great ***,we report a flexible two-terminal piezotronic n-p-n bipolar junction transistor(PBJT)that acts as an autonomous and highly sensitive,current-and/or voltage-mediated pressure *** PBJT is formed by two back-to-back piezotronic diodes which are defined as emitter-base and collectorbase *** force exertion on the emitter side,as a result of the piezoelectric effect,the emitter-base diode is forward biased while the collector-base diode is reverse *** to the inherent BJT amplification effect,the PBJT achieves record-high sensitivities of 139.7 kPa^(-1)(current-based)and 88.66 kPa^(-1)(voltage-based)in sensing *** PBJT also has a fast response time of110 ms under exertion of dynamic stimuli ranging from a flying butterfly to a gentle finger ***,the PBJT advances the state of the art not only in terms of sensitivity but also in regard to being self-driven and autonomous,making it promising for pressure sensing and other IoT applications.

关键词： bipolar transistor IoT

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Nanowires mediated growth ofβ-Ga_(2)O_(3)nanobelts for hightemperature(>573 K)solar-blind photodetectors

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Nano Research 2023年第4期16卷 5548-5554页

作者： Xiaobin Zou Dongyu Xie Yong sun Chengxin wang State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies and Guangdong Province Key Laboratory of Display Material and technology School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China

β-Ga_(2)O_(3),with ultra-wide bandgap,high absorption coefficient for high-energy ultraviolet(UV)photons,and high structural stability toward harsh-environment,has been receiving persistent attention for deep ultraviolet photodetectors ***,realization of devices with high tolerance toward high temperature faces great challenges due to considerable background signals mainly arising from abundant thermal excited ***,nanowire-mediated high-qualityβ-Ga_(2)O_(3)nanobelts with ultra-thin thickness and length up to several hundred micrometers were achieved via a simple catalyst-free chemical vapor deposition *** resulted microdevice output superior optoelectric figure of merits among numerous reports aboutβ-Ga_(2)O_(3),i.e.,ultra-low dark current(below the detection limit of 10−12 A),high responsivity(1,320 A/W),and high spectral selectivity working under low voltage(~2 V).More importantly,the performance remains robust at elevated temperature higher than 573 *** results indicate a large prospect for low-voltage driven deep ultraviolet photodetectors with good sensitivity and stability at harsh environments.

关键词： β-Ga_(2)O_(3) low-dimensional nanostructures chemical vapor deposition high temperature photodetectors solar-blind photodetectors

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High-efficiency Brillouin lasing in a planar GeSbS spiral-ring resonator

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Chinese Optics Letters 2024年第7期22卷 71-76页

作者： Jingcui Song Yuhang Wei Chunxu wang Shuixian Yang Yan Li Tianhua Feng Xiaojie Guo Zhaohui Li Guangdong Provincial Key Laboratory of Optoelectronic information Processing Chips and Systems and school of Electronics and information technology Sun Yat-sen UniversityGuangzhou 510006China Peng Cheng Laboratory Shenzhen 518000China Department of Electronic Engineering College of Information Science and TechnologyJinan UniversityGuangzhou 510632China Guangdong Provincial Key Laboratory of Optical Fiber sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China College of Physics and Optoelectronic Engineering Jinan UniversityGuangzhou 510632China Southern Marine science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China

Stimulated Brillouin scattering in planar integrated circuits promises to realize compact and highly coherent *** we report efficient Brillouin lasing at telecommunication wavelength from a planar Ge_(25)Sb_(10)S_(65) chalcogenide(ChG)resonator with a high quality factor above 106.A low lasing threshold of 24.8 mW is achieved with a slope efficiency of 8.3%.An 8-kHz linewidth is measured for 1.56-mW on-chip output *** work offers a good opportunity to enrich the versatility and functionality of the ChG photonics on account of their intrinsic advantages of low loss,high third-order nonlinearity,and potential capacity for wafer-scale fabrication.

关键词： Brillouin lasing chalcogenide photonics planar integrated circuit high-Q resonator

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A Single Sign-on Solution Based on PKI and PMI

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通讯和计算机（中英文版） 2006年第1期3卷 37-41页

作者： changji wang Bo Yang Hui Huang Computer science Department Sun Yat-Sen University Guangzhou 510275 China State Key Laboratory oflnformation Security Graduate School of Chinese Academy of Sciences Beijing 100039China Network Research Center Tsinghua University Beijing 100084. China Mathematics ＆ Computer science Department Guangdong Business College Guangzhou 510230 China

Single Sign-on (SSO) is a useful technology that allows users to skip bothersome authentication processes during access to multiple services. In this paper, we propose a new SSO model named Broker Agent Gateway SSO (BAG-SSO), and present a campus network BAG-SSO solution that makes use of Public Key Infrastructure (PKI) to provide strong authentication and Privilege Management Infrastructure (PMI) to provide flexible authorization.

关键词：公钥基础设施公共信息计算机技术单一信号

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PM_(1)颗粒物长期暴露与高血压住院:一项基于中国南方大型社区队列的因果推断研究

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science Bulletin 2024年第9期69卷 1313-1322页

作者：张昱勤陈世瑞韦晶姜杰林晓王莹郝春吴文静袁柱培孙洁王涵杜志成张王剑郝元涛 Department of Medical Statistics School of Public Health&Center for Health Information Research&Sun Yat-sen Global Health InstituteSun Yat-sen UniversityGuangzhou 510080China Department of Atmospheric and Oceanic science Earth System Science Interdisciplinary CenterUniversity of MarylandCollege Park 20742USA Department of Epidemiology&Biostatistics School of Public HealthPeking UniversityBeijing 100191China Peking university Center for Public Health and Epidemic Preparedness&Response Peking UniversityBeijing 100191China Key Laboratory of Epidemiology of Major Diseases(Peking university) Ministry of EducationBeijing 100191China

Limited evidence exists on the effect of submicronic particulate matter(PM_(1)) on hypertension hospitalization. Evidence based on causal inference and large cohorts is even more scarce. In 2015, 36,271 participants were enrolled in South china and followed up through 2020. Each participant was assigned single-year, lag0–1, and lag0–2 moving average concentration of PM_(1)and fine inhalable particulate matter(PM2.5) simulated based on satellite data at a 1-km resolution. We used an inverse probability weighting approach to balance confounders and utilized a marginal structural Cox model to evaluate the underlying causal links between PM_(1)exposure and hypertension hospitalization, with PM2.5-hypertension association for comparison. Several sensitivity studies and the analyses of effect modification were also conducted. We found that a higher hospitalization risk from both overall(HR: 1.13, 95% CI:1.05–1.22) and essential hypertension(HR: 1.15, 95% CI: 1.06–1.25) was linked to each 1 μg/m3increase in the yearly average PM_(1)concentration. At lag0–1 and lag0–2, we observed a 17%–21% higher risk of hypertension associated with PM_(1). The effect of PM_(1)was 6%–11% higher compared with PM2.5. Linear concentration-exposure associations between PM_(1)exposure and hypertension were identified, without safety thresholds. Women and participants that engaged in physical exercise exhibited higher susceptibility, with 4%–22% greater risk than their counterparts. This large cohort study identified a detrimental relationship between chronic PM_(1)exposure and hypertension hospitalization, which was more pronounced compared with PM2.5and among certain groups.

关键词： PM_(1) Hypertension Causal inference Large cohort

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THE ASYMPTOTIC BEHAVIOR AND OSCILLATION FOR A CLASS OF THIRD-ORDER NONLINEAR DELAY DYNAMIC EQUATIONS

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Acta Mathematica Scientia 2024年第3期44卷 925-946页

作者：黄先勇邓勋环王其如 Department of Mathematics Guangdong University of EducationGuangzhou510303China Department of Mathematics College of Medical Information EngineeringGuangdong Pharmaceutical UniversityGuangzhou510006China school of Mathematics Sun Yat-sen UniversityGuangzhou510275China

In this paper,we consider a class of third-order nonlinear delay dynamic ***,we establish a Kiguradze-type lemma and some useful ***,we give a sufficient and necessary condition for the existence of eventually positive solutions having upper bounds and tending to ***,we obtain new oscillation criteria by employing the Potzsche chain ***,using the generalized Riccati transformation technique and averaging method,we establish the Philos-type oscillation ***,the integral value of the Philos-type oscillation criteria,which guarantees that all unbounded solutions oscillate,is greater than θ_(4)(t_(1),T).The results of Theorem 3.5 and Remark 3.6 are ***,we offer four examples to illustrate our results.

关键词： nonlinear delay dynamic equations nonoscillation asymptotic behavior Philostype oscillation criteria generalized Riccati transformation

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城市内部创新空间集聚演化与环境要素对创新产出的影响——以深圳市为例

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经济地理 2024年第4期44卷 84-90页

作者：王波谢金燕王莉中山大学地理科学与规划学院广东广州510275 南方海洋科学与工程广东省实验室(珠海) 广东珠海519000 广东省城市化与地理环境空间模拟重点实验室广东广州510275 广州市城市规划勘测设计研究院广东广州510060

基于深圳市2005、2010、2015和2020年专利申请和兴趣点数据,从微观尺度上(1 km×1 km单元格)展示深圳市4个年份的创新空间演化特征,并通过对各年份的空间自回归泊松模型进一步考察了创新环境各要素对城市创新空间的影响及其变化。研究发... 详细信息

基于深圳市2005、2010、2015和2020年专利申请和兴趣点数据,从微观尺度上(1 km×1 km单元格)展示深圳市4个年份的创新空间演化特征,并通过对各年份的空间自回归泊松模型进一步考察了创新环境各要素对城市创新空间的影响及其变化。研究发现:(1)2005—2020年深圳市专利申请数量快速增长,创新产出呈现出空间不均衡现象,创新空间结构经历了从“龙岗—南山双核心”向“南山—福田双核心、轴带状”的演化过程。(2)在创新生产要素方面,产业园区扮演着最重要的角色,信息科技企业替代制造业企业成为创新驱动的核心力量;同时,高校/科研机构也正向显著影响着创新产出。(3)在创新生产要素空间位置选择的相关因素方面,区域交通枢纽、区位与交通可达性均显著影响创新空间;不同类型公共服务设施对创新产出的影响存在时间阶段差异。

关键词：创新空间空间集聚专利申请数信息科技企业产业园区产业转型升级空间自回归泊松模型

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Combined effect of the QBO and ENSO on the MJO

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Atmospheric and Oceanic science Letters 2019年第3期12卷 170-176页

作者： sun Liying wang Hui LIU Fei Earth System Modeling and Climate Dynamics Research Center Nanjing University of Information Science and TechnologyNanjingChina school of Atmospheric sciences Sun Yat-sen UniversityGuangzhouChina

This study investigates the combined effect of the El Nino–Southern Oscillation(ENSO) and stratospheric quasi-biennial oscillation(QBO) on the Madden Julian Oscillation(MJO). The results show that the western Pacific MJO originating from the Indian Ocean during La Nina/QBO easterly years is stronger than that during El Nino years. This relation, however, disappears during La Nina/QBO westerly years. The reason is that ENSO and the QBO have different effects on each MJO event. For an El Nino year, there is only about one MJO event, and the QBO effect is small. During a La Nina/QBO easterly year, there are 1.7 MJO events, while during a La Nina/QBO westerly year, there are only 0.6 MJO events. El Nino can reinforce the MJO over the western Pacific because of the positive moisture advection of the El Nino mean state by MJO easterly wind anomalies. The QBO mainly affects the MJO over the Maritime Continent region by changing the high-cloud-controlled diurnal cycle;and the Maritime Continent barrier effect is enhanced during the QBO westerly phase because of the strong diurnal cycle. During El Nino years, even the MJO over the Maritime Continent is suppressed by the QBO westerly phase;the MJO can be reinforced over the western Pacific. During La Nina/QBO westerly years,the MJO over the Maritime Continent is suppressed because of the strong Maritime Continent diurnal cycle, and it is further suppressed over the western Pacific because of the lack of a reinforcement process.

关键词： QBO ENSO MJO Maritime Continent diurnal cycle

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