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Three-Dimensional Wind Field Retrieved from Dual-Doppler Radar Based on a Variational Method:Refinement of Vertical Velocity Estimates

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Advances in Atmospheric Sciences 2022年第1期39卷 145-160页

作者： Chenbin XUE zhiying ding Xinyong SHEN Xian CHEN Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science and TechnologyNanjing 210044China Jiangxi Meteorological Observatory Nanchang 330096China Guangdong Province Key Laboratory of Regional Numerical Weather Prediction Institute of Tropical and Marine MeteorologyCMAGuangzhou 510080China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China Jiangxi Institute of Land and Space Survey and Planning/Jiangxi Geomatics Center Nanchang 330000China

In this paper,a scheme of dual-Doppler radar wind analysis based on a three-dimensional variational method is proposed and performed in two ***,the horizontal wind field is simultaneously recovered through minimizing a cost function defined as a radial observation term with the standard conjugate gradient method,avoiding a weighting parameter specification *** with conventional dual-Doppler wind synthesis approaches,this variational method minimizes errors caused by interpolation from radar observation to analysis grid in the iterative solution process,which is one of the main sources of ***,through the accelerated Liebmann method,the vertical velocity is further reestimated as an extra step by solving the Poisson equation with impermeable conditions imposed at the ground and near the *** Poisson equation defined by the second derivative of the vertical velocity is derived from the mass continuity *** with the method proposed by O’Brien,this method is less sensitive to the uncertainty of the boundary conditions and has better stability and ***,the method proposed in this paper is applied to Doppler radar observation of a squall line *** is shown that the retrieved vertical wind profile agrees well with the vertical profile obtained with the velocity–azimuth display(VAD)method,and the retrieved radial velocity as well as the analyzed positive and negative velocity centers and horizontal wind shear of the squall line are in accord with radar *** is a good correspondence between the divergence field of the derived wind field and the vertical ***,the horizontal and vertical circulations within and around the squall line,as well as strong updrafts,the associated downdrafts,and associated rear inflow of the bow echo,are analyzed *** is worth mentioning that the variational method in this paper can be applied to simultaneously synthesize the three-dimensional wind fiel

关键词： dual-Doppler radar three-dimensional wind a variational method vertical velocity wind synthesis

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Relationship of tropical-cyclone-induced remote precipitation with tropical cyclones and the subtropical high

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Frontiers of Earth Science 2016年第3期10卷 595-606页

作者： Rui XING zhiying ding Sangjie YOU Haiming XU Key Laboratory of Meteorological Disasters of the Ministry of Education Nanjing University of Information Science & Technology Nanjing 210044 China Department of Atmospheric Sciences Nanjing University of Information Science & Technology Nanjing 210044 China

This study concerns the precipitation induced by a tropical cyclone （TC） before the TC arrives, which will be referred to as TC remote precipitation （TRP）. Based on the distribution characteristics of the non-rotational wind and the divergent-wind vertical circulation related to TC, the subtropical high, and TRP of 45 TRP events during June, July, and August of 2000-2009, the relationships among these three entities （TC, subtropical high, and TRP） can be categorized into four patterns. The first pattern accounts for the highest proportion of the TRP events （59%）, and a conceptual model is then provided for this pattern. The primary characteristics of this model are as follows： TC, the subtropical high, and TRP can interact with each other through the divergent-wind secondary circulation at both sides of the ridge line of the subtropical high （between the subtropical high and TC, and between the subtropical high and TRP）. At the upper level （150 or 200 hPa）, the northward non-rotational wind from the TC converged toward the subtropical high ridge line and subsided, and at 950 hPa the divergent wind from the ridge line of the subtropical high converged toward TC; these constructed the secondary circulation between TC and the subtropical high. In the meantime, the southward non- rotational wind at the upper level （150 or 200hPa） from TRP and the divergent wind at 950hPa from the subtropical high ridge line toward TRP constructed the secondary circulation between TRP and the subtropical high. As TC and TRP interacted with each other, the subtropical high ridge line was usually under the down- draft area of the whole atmosphere. The other three patterns are different from the first pattern mainly in terms of the intensity and position of the non-rotational-wind secondary circulation. The numerical simulation of the Beijing 7.21 rainstorm confirmed the relationship amongTC, the subtropical high, and TRP, indicating that when the interaction weakened, the TRP also weakened

关键词： tropical cyclone,precipitation subtropical high,simulation tropical cyclone remotedivergent wind numerical

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Analysis of three echo-trainings of a rainstorm in the South China warm region

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Frontiers of Earth Science 2018年第2期12卷 381-396页

作者： zhiying ding Lei QIAN Xiangjun ZHAO Fan XIA Key Laboratory of Meteorological Disaster Nanjing University of Information Science and Technology Nanjing 210044 China College of Atmospheric Sciences Nanjing University of Information Science and Technology Nanjing 210044 China Anhui Meteorological Observatory Hefei 230061 China

A rainstorm which occurred between May 22and 23, 2014 in Guangdong Province of the South Chinawarm region was simulated by using the ARW-WRFmodel. Three ＂echo-trainings＂ over the rainstorm centerwere analyzed and the results of both the simulation andobservational analysis showed that this rainstorm processwas composed of three stages. In the first stage, gravitywaves triggered the simultaneous but relatively indepen-dent formation of linearwhich moved toward theconvection and convective cells,northeast through the rain center,thus creating the echo-training. In the second stage, withthe formation of cold outflow, new convective cells werecontinuously created in the southwest and northwest of therain area and then gradually moved to merge into thenortheast rain area, thus forming a new echo-training. Inthe third stage, multiple rain bands above the rain areamoved southeastward and passed through the strongestprecipitation center, thus creating the third *** model simulation showed that a substantial warmingappeared at 900 hPa before the convective initiation,leading to the formation of a stable layer below 900 hPa,which was the primary cause for the gravity waves thattriggered the multiple convective cells. The multipleconvective cells formed the convective line, followingwhich new convection was formed from the cold outflowin its southwest and northwest directions. The newconvection in the southwest maintained the rain band;however, the new convection in the northwest, combinedwith the rain band of the north, formed a large radarreflectivity area and consequently, a larger MCS.

关键词： convective line gravity wave echo-training back building

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重症病人肠内营养相关性腹泻风险预测模型的系统评价

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循证护理 2025年第3期11卷 388-394页

作者：聂清梅孙莉莉丁治英孙磊娜温慧潍坊市人民医院山东261000

目的:对肠内营养相关性腹泻的风险预测模型进行系统检索和评价,以期为构建更高质量的肠内营养相关性腹泻风险预测模型提供参考。方法:检索中国生物医学文献数据库、万方数据库、中国知网、EMbase、PubMed、CINAHL、Web of Science、the ... 详细信息

目的:对肠内营养相关性腹泻的风险预测模型进行系统检索和评价,以期为构建更高质量的肠内营养相关性腹泻风险预测模型提供参考。方法:检索中国生物医学文献数据库、万方数据库、中国知网、EMbase、PubMed、CINAHL、Web of Science、the Cochrane Library中的相关文献,检索时限为建库至2024年3月1日,限定语种为英文和中文。由2名研究者独立筛选文献和提取数据,并应用预测模型研究的偏倚风险和适用性评估工具(PROBAST)对纳入研究的偏倚风险和适用性进行评价。结果:共纳入6项肠内营养相关性腹泻的风险预测模型构建研究,6个模型的受试者工作特征曲线下面积为0.732~0.940,涉及最多的预测因子是禁食时间、肠内营养日剂量、口服钾制剂时间和应用抗生素情况。整体适应性较好,偏倚风险较高,偏倚主要来自未选择合适的数据来源、样本量不足、对缺失数据关注不足和缺乏模型性能评估等。结论:现有证据表明,肠内营养相关性腹泻风险预测模型研究偏倚风险较高,正处于发展阶段;未来研究应关注对不同风险评估方法有效性的研究,构建偏倚风险低、预测性能优良、符合我国临床实践实施的风险预测模型。

关键词：肠内营养腹泻预测模型系统评价循证护理

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The Seismic-Geological Comprehensive Prediction Method of the Low Permeability Calcareous Sandstone Reservoir

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Open Journal of Geology 2016年第8期6卷 757-762页

作者： Hongyan Jiao zhiying ding College of Petroleum Engineering China University of Petroleum Qingdao China

Currently in Niu-zhuang sub-sag, the seismic reflection amplitude of the newly discovered turbidite sandstone is stronger in the third Segment. The main reason is that Calcareous components accounts for a large part and physical properties is relatively poor, which results in no corresponding relation between reservoir and seismic attributes, and effective reservoir is difficult to predict and describe. Therefore, using the method of geological statistics, we firstly study the distribution of calcareous matters, secondly study the contribution to seismic reflection amplitude made by Calcareous high impedance component;thirdly analyze its influence on actual seismic reflection amplitude and determine the lithology thickness of Calcareous via replacement forward modeling. At last, we characterize the reservoir using the amplitude of calcareous matters. It proves that the method of seismic-geological comprehensive prediction is reliable. It has good guidance for exploration and development of the calcareous sand lithologic reservoir in similar areas.

关键词： Calcareous Sand-Stone Geostatistical Reflection Amplitude Calcareous Forward Modeling Reservoir Prediction

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Dislocations in the Crystallites of Nanocrystalline α-Fe—A Molecular Dynamics Study

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Journal of Materials Science & Technology 1996年第6期12卷 476-478页

作者： zhiying CHEN and Jiaqans ding (Lab. on Non-linear Mechanics of Continuous Media, Institute of Mechanics, Chinese Academy of Sciences,Beijing 100080, China)(To whom correspondence should be addressed) Lab. on Non-linear Mechanics of Continuous Media Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China

Molecular dynamics simulations are carried out in order to Study the atomic structure of crystalline component of nanocrystalline α-Fe when it is consolidated from small grains. A two-dimensional computational block is used to simulate the consolidation process. All the preset dislocations in the original grains glide out of them in the consolidation process, but new dislocations can generate when the grain size is large enough. It shows that dislocations exist in the consolidated material rather than in the original grains. Whether dislocations exist in the crystalline component of the resultant model nano-material depends upon grain size. The critical value of grain size for dislocation generation appears to be about 9 nm. This result agrees with experiments qualitatively.

关键词： Fe A Molecular Dynamics Study Dislocations in the Crystallites of Nanocrystalline

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替罗非班冠状动脉内注射治疗STEMI患者PCI术中无复流或慢血流的效果及安全性

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临床合理用药 2025年第3期18卷 5-8页

作者：王小龙孙胜谢地成马文超丁治英刘同祥山东省潍坊市人民医院急诊部 261000

目的观察替罗非班冠状动脉内注射治疗ST段抬高心肌梗死(STEMI)患者经皮冠脉介入治疗(PCI)术中无复流或慢血流的效果及安全性。方法回顾性选取2021年3月—2022年3月潍坊市人民医院急诊入院行PCI治疗的STEMI患者128例,按照治疗用药不同... 详细信息

目的观察替罗非班冠状动脉内注射治疗ST段抬高心肌梗死(STEMI)患者经皮冠脉介入治疗(PCI)术中无复流或慢血流的效果及安全性。方法回顾性选取2021年3月—2022年3月潍坊市人民医院急诊入院行PCI治疗的STEMI患者128例,按照治疗用药不同分为观察组(n=64)与对照组(n=64)。2组均常规应用β受体阻滞剂和血管紧张素转换酶抑制剂等药物、注射用比伐芦定(术前、术后)治疗,术后给予阿司匹林肠溶片、替格瑞洛片治疗。在此基础上,观察组术中给予盐酸替罗非班氯化钠注射液,对照组术中给予0.9%氯化钠注射液。比较2组术前、支架植入完成即刻、术后即刻冠状动脉血流分级,主要不良心血管事件(MACE)及出血情况。结果 2组术前、支架植入完成即刻心肌梗死溶栓试验分级(TIMI)≤2级及校正的TIMI帧数(CTFC)≥40者占比比较,差异无统计学意义(P>0.05);观察组术后即刻TIMI≤2级及CTFC≥40者占比均低于对照组(12.50%vs. 26.56%、9.38%vs. 23.44%,χ^(2)/P=4.026/0.045、4.614/0.032)。观察组MACE总发生率低于对照组(9.38%vs. 23.43%,χ^(2)=4.614,P=0.032)。观察组与对照组出血总发生率比较,差异无统计学意义(23.44%vs. 21.88%,χ^(2)=0.045,P=0.833)。结论行PCI治疗的STEMI患者,在常规药物治疗基础上冠状动脉内注射替罗非班的疗效显著,且不增加出血及血小板减少风险,安全性较高。

关键词： ST段抬高心肌梗死替罗非班比伐芦定无复流慢血流

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A wearable sensor device based on screen-printed chip with biofuel cell-driven electrochromic display for noninvasive monitoring of glucose concentration

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Chinese Chemical Letters 2025年第2期36卷 441-445页

作者： Kezuo Di Jie Wei Lijun ding zhiying Shao Junling Sha Xilong Zhou Huadong Heng Xujing Feng Kun Wang School of Chemistry and Chemical Engineering Jiangsu University Key Laboratory for Theory and Technology of Intelligent Agricultural Machinery and Equipment Jiangsu University

Wearable flexible sensor devices have the characteristics of lightweight and ***,power supply and detection components limit the portability of wearable flexible sensor ***,conventional liquid electrolytes are unsuitable for the integration of sensing *** address these constraints,wearable biofuel cells and flexible electrochromic displays have been introduced,which can improve integration with other devices,safety,and color-coded display ***,electrode chips prepared through screen printing technology can further improve *** this work,a wearable sensor device with screen-printed chips was constructed and used for non-invasive detection of *** gel electrolytes doped with PDA-CNTs were prepared,and the mechanical strength and moisture retention were significantly improved compared with traditional gel *** in interstitial fluid was non-invasive extracted to the skin surface using reverse *** a biofuel for wearable biofuel cells,glucose drives self-powered sensor and electrochromic display to produce color change,allowing for visually measurement of glucose levels in body *** detection results can be visualized by reading the RGB value with a cell phone.

关键词： Biofuel cell Electrochromic display Screen-printed chip Visualization Wearable flexible sensor device

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热带气旋“莫拉克”在台湾岛登陆前后结构与路径演变机理分析

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自然灾害学报 2014年第6期23卷 47-57页

作者：王勇丁治英李勋南京信息工程大学气象灾害教育部重点实验室江苏南京210044 南京信息工程大学世界气象组织南京区域培训中心江苏南京210044 海南省气象台海南海口570203

采用全球预报场分析资料、卫星云图资料及实况观测台风强度、路径资料对2009年热带气旋"莫拉克"在台湾岛登陆前后其结构、路径的演变特征进行了动力学分析,以揭示其演变机理。分析结果表明:(1)热带气旋低层、切向风中心外侧的惯性稳定... 详细信息

采用全球预报场分析资料、卫星云图资料及实况观测台风强度、路径资料对2009年热带气旋"莫拉克"在台湾岛登陆前后其结构、路径的演变特征进行了动力学分析,以揭示其演变机理。分析结果表明:(1)热带气旋低层、切向风中心外侧的惯性稳定度低值区,有可能产生径向上加速内流的径向风,其对热带气旋结构的分布产生影响;(2)β效应项产生的高低层通风气流、以及高低层涡旋中心相对位置对热带气旋路径的预报具有重要意义;(3)登陆前后热带气旋尺度在经向上拉伸,在纬向上收缩,这种结构演变对移动速度产生影响;(4)低层辐合中心、正的涡度平流中心量级相当,是影响热带气旋强度与结构演变的重要因素;(5)通过EOF方法分解的500 h Pa位势高度距平场其第1,2模态很好地揭示了热带气旋环境场的演变。

关键词：热带气旋,惯性稳定度 β效应 EOF分解

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Modeling,Analysis and Validation of Friendship Paradox in Evolving Networks

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China Communications 2025年第1期22卷 216-234页

作者： Xu Jiasheng Fu Luoyi Xu zhiying ding Jiaxin Zhou Lei Wang Xinbing Zhou Chenghu Department of Electronic Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Computer Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200240China Institute of Geographical Sciences and Natural Resources Research Chinese Academy of SciencesBeijing100101China

Friendship paradox states that individuals are likely to have fewer friends than their friends do,on *** of its wide existence and appealing applications in real social networks,the mathematical understanding of friendship paradox is very *** few works provide theoretical evidence of single-step and multi-step friendship paradoxes,given that the neighbors of interest are onehop and multi-hop away from the target ***,they consider non-evolving networks,as opposed to the topology of real social networks that are constantly growing over *** are thus motivated to present a first look into friendship paradox in evolving networks,where newly added nodes preferentially attach themselves to those with higher *** analytical verification of both single-step and multistep friendship paradoxes in evolving networks,along with comparison to the non-evolving counterparts,discloses that“friendship paradox is even more paradoxical in evolving networks”,primarily from three aspects:1)we demonstrate a strengthened effect of single-step friendship paradox in evolving networks,with a larger probability(more than 0.8)of a random node’s neighbors having higher average degree than the random node itself;2)we unravel higher effectiveness of multi-step friendship paradox in seeking for influential nodes in evolving networks,as the rate of reaching the max degree node can be improved by a factor of at least Θ(t^(2/3))with t being the network size;3)we empirically verify our findings through both synthetic and real datasets,which suggest high agreements of results and consolidate the reasonability of evolving model for real social networks.

关键词： evolving networks friendship paradox random walk social networks

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