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经皮肾镜碎石术后尿源性脓毒血症的临床预测模型

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国际泌尿系统杂志 2024年第5期44卷 785-789页

作者：袁龙平陈令秋王鹏乙从亮淮北市人民医院泌尿外科淮北235000

目的建立经皮肾镜碎石术(PCNL)后引起尿源性脓毒血症的危险因素的预测模型。方法回顾性分析2018年8月至2022年8月本院行PCNL治疗的220例肾结石、输尿管上段结石患者的临床资料,依据术后是否进展为脓毒血症将患者分成尿源性脓毒血症组(21... 详细信息

目的建立经皮肾镜碎石术(PCNL)后引起尿源性脓毒血症的危险因素的预测模型。方法回顾性分析2018年8月至2022年8月本院行PCNL治疗的220例肾结石、输尿管上段结石患者的临床资料,依据术后是否进展为脓毒血症将患者分成尿源性脓毒血症组(21例)及非尿源性脓毒血症组(199例),并分别对两组患者的年龄、性别、体质量指数(BMI)、糖尿病史、尿常规、尿培养等影响因素进行单因素和多因素分析,建立相对应的列线图预测模型。结果多因素logistic回归分析结果显示,糖尿病史(OR=7.64,P=0.002)、尿培养(OR=2.97,P=0.021)、肾积水CT值(OR=4.52,P=0.013)、结石数量(OR=4.25,P=0.032)、鹿角形结石(OR=3.70,P=0.036)均是PCNL术后发生脓毒血症的独立危险因素。预测模型的曲线下面积为0.919,Hosmer-Lemeshow检验提示预测模型具有良好的区分度和校准度(χ^(2)=4.069,P=0.851)。结论糖尿病史、中段尿培养、肾积水CT值、结石数量、鹿角形结石是PCNL术后发生尿源性脓毒血症的独立危险因素。

关键词：脓毒症肾造口术,经皮碎石术

Comparison and Analysis of Tidal Level Monitoring Accuracy between GNSS-IR and Satellite Altimetry

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Comparison and Analysis of Tidal Level Monitoring Accuracy b...

Research on GNSS-IR height measurement performance of smartphone platform

第十四届中国卫星导航年会

作者： Naiquan Zheng Hongzhou Chai Zhiyuan An Peng chen lingqiu chen Lixia Liu Institute of Geospatial Information PLA Information Engineering University College of Geomatics Xi'an University of Science and Technology The First Geographic Information Mapping Institute Ministry of Natural Resources

The coexistence of multiple methods has become a general trend in tidal level monitoring, especially the Global Navigation Satellite System Interferometric Reflectometry(GNSS-IR) technology and satellite altimetry technology provide a richer database for sea level monitoring. Few studies have carried out the comparison of tidal level accuracy obtained by the two *** on this, this study takes BUR2 station as an example to carry out the research on tidal level monitoring of GNSS-IR and satellite altimetry(HY-2B and Jason-3), and compares them with the measured tidal level data provided by the tidal gauge station(BURTG). First, unify the respective time bases to Coordinated Universal Time(UTC) and the elevation base to Tide Gauge Zero(TGZ). Then, the characteristics of the two methods to monitor the tidal level are compared and analyzed. GNSS-IR technology has higher temporal resolution(R: 0.957, RMSE: 0.257 m, ME:-0.008 m, Number: 73936), while HY-2B(R: 0.994, RMSE: 0.105 m, ME: 0.025 m, Number: 178) and Jason-3(R: 0.995, RMSE: 0.113 m, ME:-0.040 m, Number: 461) have higher inversion accuracy. This study explored the respective characteristics of GNSS-IR technology and satellite altimetry technology for tidal level monitoring, laying a foundation for the subsequent integration of tidal level monitoring.

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Research on GNSS-IR height measurement performance of smartp...

第十三届中国卫星导航年会

作者： Naiquan Zheng lingqiu chen Hongzhou Chai Tengfei Bai Xueying Yang Institute of Surveying and Mapping Information Engineering University College of Geomatics Xi'an University of Science and Technology

The technology of Global Navigation Satellite System Interferometric Reflectometry（GNSS-IR） is widely used, which has a relatively broad development space in sea level monitoring, snow depth detection, soil moisture inversion and determination of sea ice thickness. As it matures, GNSS-IR technology is also becoming more popular and low-cost. This study uses the Signal-to-Noise Ratio（SNR） data received by the smartphone Redmi Note 9 Pro 5 G and the GNSS receiver Trimble R10 to perform a GNSS-IR test for the inversion effect of the reflection height. The common SNR types are GPS-S1 C, GLONASS-S1 C and BDS-S2 I. Three evaluation indicators evaluate the accuracy of the inversion result of each SNR type: mean（MEAN）, median（MEDIAN） and root mean square error（RMSE）. It is known from the ground height retrieved by the experiment that both the Redmi Note 9 Pro 5 G and Trimble R10 receiver maintain a good monitoring result. After the result of the three satellite navigation system are fused, the ground height retrieved by the Redmi Note 9 Pro 5 G is compared with the measured height. And the RMSE is 10.4 cm. The MEAN is 1.646 m, which is only 2.4 cm away from the true value. The MEDIAN is 1.668 m, which is only 0.2 cm away from the true value. This study verifies the applicability and reliability of smartphone SNR data in GNSS-IR ground height inversion, laying a foundation for the low-cost development of GNSS-IR technology in the future.

关键词： Smartphone SNR GNSS-IR Ground Height Inversion

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Profile of *** chen

Science China(Life Sciences) 2024年第10期67卷 2062-2063页

作者： chen, Songlin Yellow Sea Fisheries Res Inst Qingdao Peoples R China

For decades,*** has been engaged in fish germplasm preservation,sex control and research focusing on molecular breeding for disease *** discovered the first sex-specific molecular marker of fish(chen et al.,2007),deciphered the first fish genome(Chinese tongue sole)in China,revealed the sex determination mechanism in fish(chen et al.,2014),and created molecular sex control *** also discovered the molecular mechanism of metamorphosis in flatfish(Shao et al.,2017)and developed China's first fish disease-resistant breeding gene chip,“YUXIN No.1”.

关键词： technology breeding

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基于BDS信噪比的潮位监测精度分析与评估

大地测量与地球动力学 2022年第10期42卷 995-999页

作者：郑乃铨陈鹏陈灵秋李政张乾坤信息工程大学地理空间信息学院郑州市450001 西安科技大学测绘科学与技术学院西安市710054 武汉大学测绘学院武汉市430079

基于非洲东海岸MAYG站2020年年积日268~366的信噪比(SNR)数据开展GNSS-IR(global navigation satellite system interferometric reflectometry)监测海平面高度研究,并与Dzaoudzi验潮站的实测潮位进行对比。结果显示,BDS-GEO不适用于岸... 详细信息

关键词： GNSS-IR 潮位监测反射信号 SNR BDS3

Effect of Reclamation on the Groundwater-Lake Water Interaction in chen Lake

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Journal of Earth Science 2024年第3期35卷 1083-1086页

作者： Kun Lei Teng Ma Liuzhu chen Zhenxing Li Yu chen School of Environmental Studies State Key Laboratory of Biogeology and Environmental GeologyChina University of GeosciencesWuhan 430078China

0 INTRODUCTION To relieve the short supply of suitable land for residing,cultivating,and commerce,it is accepted to reclaim land from lakes,river estuaries,and coastal regions in many countries(Mancini et al.,2020).The large-scale reclamation activities have an irreversible effect on the mico-geomorphology and hydrodynamic system of seasonally flooded areas(Zhang et al.,2019;Yu et al.,2018).For example,coastal regions reclaimed extended the groundwater flow paths,as well as created groundwater level rise,resulting in water-logging in the reclaimed area(Hu et al.,2008).Similar changes in groundwater flow systems may alter groundwater-lake water interactions,and it can ultimately affect the water cycle in the lake ***,such detailed studies are presently *** addition,natural exchanges between the lake and groundwater systems can be strongly affected by physical hydrological processes(Javadzadeh et al.,2020),chemical properties(Kamtchueng et al.,2015),and bioto behavior(Hancock et al.,2005).

关键词： groundwater coastal logging

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体育场高空大跨度大截面斜挑梁施工技术

建筑施工 2017年第11期39卷 1623-1625页

作者：吴小伟金振陈玲秋浙江省建工集团有限责任公司浙江杭州310012 广厦建设集团有限责任公司浙江杭州310013 乐清市乐成中心城区开发建设管理委员会浙江温州325600

乐清市体育中心体育场看台高度达到24.46 m,截面尺寸为500 mm×2 700 mm的大梁斜向挑出15 m,对扣件式钢管脚手架支撑系统的设计与施工带来了不小的难度。为此,通过科学的设计和合理施工,并对高空斜挑梁承重架体采取针对性的构造措施以... 详细信息

乐清市体育中心体育场看台高度达到24.46 m,截面尺寸为500 mm×2 700 mm的大梁斜向挑出15 m,对扣件式钢管脚手架支撑系统的设计与施工带来了不小的难度。为此,通过科学的设计和合理施工,并对高空斜挑梁承重架体采取针对性的构造措施以加强其横向刚度与整体稳定性,最终确保了架体安全,取得了良好的施工效果。

关键词：体育场看台结构大截面斜挑梁支撑系统刚度抗侧力

Meridional deflection of global eddy propagation derived from tandem altimetry: Mechanism and implication

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Science China Earth Sciences 2024年第3期67卷 811-825页

作者： Ge chen Xiaoyan chen Frontiers Science Center for Deep Ocean Multispheres and Earth System School of Marine TechnologyOcean University of ChinaQindao 266100China Laboratory for Regional Oceanography and Numerical Modeling Laoshan LaboratoryQindao 266237China

A common view on meridional deflection of eddy propagation is poleward for cyclones and equatorward for anticyclones. This widely accepted polarity-sensitive pattern has been increasingly undermined given that it is systematically violated on both zonal and regional scales as recently reported. Here, we approach the problem by exploring these violations in terms of eddy effects of spatiotemporal geostrophy, thermal fading, and flow dragging, yielding the following main conclusions.(1) The polarity-dependent deflection discrepancy is a pseudo feature resulting from a biased fit to the normalized eddy tracks which are spatially asymmetric(though azimuthally symmetric) between the two signs;Instead, the primary pattern of eddy deflection appears to be geographically correlated and polarity independent.(2) Geostrophic adjustment plays a critical role in defining the meridional movement of an eddy. Specifically, a consistent poleward(equatorward) trajectory bending of spatially(temporally) ageostrophic eddies is observed irrespective of their polarity.(3) The mechanism of eddy deflection is also determined by its zonal propagation direction. Westward propagating eddies are substantially affected by thermal fading, while opposite ones by flow dragging. A realistic and comprehensive understanding of eddy deflection mechanisms serves as a significant contribution to the prediction of eddy trajectory, and the protection of ocean environment.

关键词： Mesoscale eddies Eddy propagation Eddy meridional deflection Satellite observation Geostrophic adjustment

A refined representation method of the particle size distribution curve based on grading entropy

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Particuology 2024年第5期88卷 302-311页

作者： Xing Li Qun chen Zhaozhao Liu cheng Zhou chen Wang chen chen State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610065China

The particle size distribution(PSD)curve is an important expression of the basic properties of the *** characteristic parameters such as median particle size D_(50),effective particle size D_(10),and some combinations of characteristic parameters can only represent some points of the PSD curve,failing to represent all information of the PSD *** this paper,a fraction characteristic parameter F that could reflect the fraction size variation of the PSD curve was introduced based on grading *** a new presentation method of the A-B-F three parameters was proposed for a refined representation of the PSD *** was found that the newly constructed model not only better represents the differences in the width of PSD curves but also has a higher sensitivity than the A-B two-parameter model proposed by Lő*** PSD curves with similar distributions,the new presentation method has a higher degree of discrimination than that of the D_(50)-C_(u)-C_(c) three-parameter or the four-parameter combination G_(c) proposed by ***,the application of this new method in describing the spatial nonuniformity distribution of depositions and predicting the soil hydraulic conductivity was *** research results can provide a reference for the refined representation of PSD curves.

关键词： Grading entropy Particle size distribution curve Refined representation