检索结果-南通市图书馆

Impact of meteorological conditions and PM2.5 on the onset of acute aortic dissection in monsoonal climate

Journal of Geriatric Cardiology 2018年第4期15卷 315-320页

作者： Xiao-Nan HE jin-liang zhan Cheng zhanG Yu CHEN Wei GONG Wang JI Shao-Ping NIE Emergency Critical Care Center Beijing AnZhen Hospital Capital Medical University Beijing China School of Management and Economics Beijing Institute of Technology Beijing China Department of Cardiology China-Japan United Hospital Affiliated to Jilin University Changchun China Beijing Regional Climate Center Beijing China

Objective To investigate the impact of meteorological conditions and PM2.5 on the onset of acute aortic dissection in monsoonal climate. Methods A linear regression analysis was performed in monsoonal climate epidemiological survey for a period of four years on the impact of meteorological factors （minimal temperature, mean temperature, maximal temperature, average daily surface temperature, day temperature range, relative humidity, mean wind speed, and atmospheric pressure） and PM2.5 concentration on the daily incidences of acute aortic dissections. Meteorological variables and PM2.5 concentration were retrieved on a daily basis from Beijing Regional Climate Center and the Ministry of Environmental Protection of the People’s Republic of China’s website, and the daily incidences of acute aortic dissections were retrieved from the Clinical Data Analysis and Reporting System in the Emergency and Critical Care Center of Beijing Anzhen Hospital. Results During the study period （from January 2011 to December 2014）, 1164 patients were identified as having acute aortic dissections. The corresponding incidences in spring and autumn were 0.96 and 1.00, respectively, which significantly higher than that in summer and winter. The incidences of acute aortic dissection in a day could be predicted by diurnal temperature range （DTR） using the following linear multiple regression models： incidences of acute aortic dissection = 0.543 ＋ 0.025 × DTR. Conclusion This is the first study to show an attributable effect of DTR on acute aortic events in monsoonal climate. Our study confirms that meteorological variables were important factors influencing the incidence of acute aortic dissection.

关键词： Acute aortic dissection Meteorological conditions PM2.5

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

PBL教学法在护理实习生急诊带教中应用效果分析

引用

中国当代医药 2017年第6期24卷 166-168页

作者：薛金梁于占营内蒙古自治区第四医院急诊科内蒙古呼和浩特010020 内蒙古自治区第四医院重症医学科内蒙古呼和浩特010020

目的研究PBL教学法应用于护生在急诊带教的实际效果。方法选择2015年7月~2016年4月在内蒙古第四医院急诊科实习的内蒙古某医学院护理学院本科护理实习生60名,按照入科摸底考试成绩顺序均衡分、随机分为实验组和对照组,每组各30名。实验... 详细信息

目的研究PBL教学法应用于护生在急诊带教的实际效果。方法选择2015年7月~2016年4月在内蒙古第四医院急诊科实习的内蒙古某医学院护理学院本科护理实习生60名,按照入科摸底考试成绩顺序均衡分、随机分为实验组和对照组,每组各30名。实验组采用PBL教学法带教,对照组按照传统方法带教,在实习4周后,分别比较两组护生的急救护理学基本理论、相关操作技能、对急诊科带教老师教学方法和效果的满意度。结果实验组出科理论、出科操作考试成绩及护理病历书写得分均高于对照组(P<0.05);实验组教学满意度高于对照组(P<0.05)。结论 PBL教学法能使护生在急诊科实习中更好地将护理理论与临床实践紧密结合,提高护生理论、操作、自学、解决问题等各方面的能力,改善教学质量和学习体验,值得在护理临床教学中推广应用。

关键词： PBL教学法护理实习生急诊临床带教

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Based on non-targeted metabolomics for differential components screening of Rosae Chinensis Flos and Rosae Rugosae Flos and their quality evaluation

引用

Traditional Medicine Research 2025年第2期10卷 1-15页

作者： Xu liang Ni-Hui zhang Zhi-Lai zhan Guang-Lu Chang Yan Gao Xia Li Wen-Yuan Gao School of Pharmaceutical Science and Technology Faculty of MedicineTianjin UniversityTianjin 300193China State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs China Academy of Chinese Medical SciencesBeijing 100700China Key Laboratory of Modern Chinese Medicine Resources Research Enterprises Tianjin 300402China

Background:Rosa chinensis *** Rosa rugosa *** not only of ornamental value,but also edible flowers and the flower buds have been listed in the Chinese Pharmacopoeia as traditional *** two plants have some differences in efficacy,but the flower buds are easily confused for similar *** addition,large-scale cultivation of ornamental rose flowers may lead to a decrease in the effective components of medicinal ***,it is necessary to study the chemical composition and make quality evaluation of Rosae Chinensis Flos(Yueji)and Rosae Rugosae Flos(Meigui).Methods:In this study,40 batches of samples including Meigui and Yueji from different regions in China were collected to establish high-performance liquid chromatography ***,the fingerprints data was analyzed using principal component analysis,hierarchical cluster analysis,and partial least squares discriminant analysis analysis chemometrics to obtain information on intergroup differences,and non-targeted metabolomic techniques were applied to identify and compare chemical compositions of samples which were chosen from groups with large *** compounds were screened by orthogonal partial least-squares discriminant analysis and S-plot,and finally multi-component quantification was performed to comprehensively evaluate the quality of Yueji and ***:The similarity between the fingerprints of 40 batches roses and the reference print R was 0.73 to 0.93,indicating that there were similarities and differences between the *** principal component analysis and hierarchical cluster analysis of fingerprints data,the samples from different origins and varieties were intuitively divided into four *** least-squares discriminant analysis analysis showed that Meigui and Yueji cluster into two categories and the model was reliable.A total of 89 compounds were identified by high resolution mass spectrometry,mainly were flavonoids and flavon

关键词： Rosa chinensis Jacq. Rosa rugosa Thunb. metabolomics chemometrics multiple component quantification quality evaluation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

An embedded electron current layer observed at the edge of the plasma sheet in the Earth’s magnetotail

引用

Earth and Planetary Physics 2025年第1期9卷 148-158页

作者： ChenChen zhan RongSheng Wang QuanMing Lu San Lu XinMin Li Deep Space Exploration Laboratory/School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences(CAS)Center for Excellence in Comparative Planetology/CAS Key Laboratory of Geospace Environment/Anhui Mengcheng National Geophysical Observatory University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Astronautical Science and Technology Harbin 150001China

The formation of an embedded electron current sheet within the magnetotail plasma sheet has been poorly *** this article,we present an electron current layer detected at the edge of the magnetotail plasma *** ions were demagnetized inside the electron current layer,but the electrons were still frozen in with the magnetic field ***,this decoupling of ions and electrons gave rise to a strong Hall electric field,which could be the reason for the formation of the embedded thin current *** magnetized electrons,the absence of the nongyrotropic electron distribution,and negligible energy dissipation in the layer indicate that magnetic reconnection had not been triggered within the embedded thin current *** highly asymmetric plasma on the two sides of the current layer and low magnetic shear across it could suppress magnetic *** observations indicate that the embedded electric current layer,probably generated by the Hall electric field,even down to electron scale,is not a sufficient condition for magnetic reconnection.

关键词： magnetotail plasma sheet magnetic reconnection

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

ADDIE模型下“程序设计”课程混合式教学设计

引用

电气电子教学学报 2018年第3期40卷 43-46,64页

作者：卢瑾任宏亮张健俞山青浙江工业大学信息工程学院浙江杭州310023

本文将教学设计理论模型引入到"程序设计"课程的混合式教学模式中,旨在更为系统有序地安排教学过程,优化教学效果。通过引入智能教学工具等新媒体,构建基于ADDIE模型的混合式教学模式,通过分析和评估对各阶段的关键要素进行研究探讨,针... 详细信息

本文将教学设计理论模型引入到"程序设计"课程的混合式教学模式中,旨在更为系统有序地安排教学过程,优化教学效果。通过引入智能教学工具等新媒体,构建基于ADDIE模型的混合式教学模式,通过分析和评估对各阶段的关键要素进行研究探讨,针对"程序设计"课程的内容分类设计不同的教法方案,讨论了教学实施过程中课程内外不同阶段的教学活动,为提高"程序设计"课程教学质量提供有力依据。

关键词： ADDIE模型混合式教学教学设计

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evolution and paleogeography of Eospirifer(Spiriferida,Brachiopoda) in Late Ordovician and Silurian

引用

Science China Earth Sciences 2012年第9期55卷 1427-1444页

作者： zhan RenBin jin JiSuo liang Yan MENG LingKai State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China Department of Earth Sciences University of Western OntarioLondonON N6A 5B7Canada

Eospirifer,the oldest known genus of the spiriferide group(Brachiopoda),first appeared on the Zhe-Gan Platform of South China paleoplate during late Katian(Late Ordovician) represented by *** survived the end-Ordovician mass extinction,and reappeared on the Upper Yangtze Platform of South China paleoplate by the end of Ordovician near the upper part of the Normalograptus persculptus *** from the beginning of Silurian,Eospirifer experienced some morphological innovations and expanded its geographical distribution *** reached its species diversity acme and the widest geographic distribution in Wenlock(middle Silurian),with the diversity hotspots in Laurentia,Avalonia,and *** shell size frequency curves of *** under different paleogeographic settings suggest that this pioneer species of Eospirifer,with several macroevolutionary novelties,adopted a range of life strategies to adapt to the changing environments during early spiriferide *** are also some morphological macroevolutionary trends during the evolutionary history of Eospirifer from Late Ordovician to the end of Silurian,such as the ever enlarging shell sizes and the width/length ratios from late Katian to Wenlock,but decreasing apparently of both parameters from Wenlock to Pridoli.

关键词： Eospirifer macroevolution Ordovician-Silurian species diversity paleogeographic distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Charge disproportionation induced exchange bias in La_(0.5)Ca_(0.5)FeO_(3-δ)

引用

Science China(Physics,Mechanics & Astronomy) 2013年第11期56卷 2085-2089页

作者： liang YaQiong zhanG XiangQun jin jinLing zhan QingFeng CHENG ZhaoHua Logistic School Beijing Wuzi University State Key Laboratory of Magnetism Institute of PhysicsChinese Academy of Sciences Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology and EngineeringChinese Academy of Sciences

We observed an exchange bias effect in La0.5Ca0.5FeO3 perovskite *** exchange bias is associated with the charge disproportionation transition from Fe4+ions to Fe3+and Fe5+ions below 175 *** competition between the ferromagnetic interaction of Fe3+and Fe5+ions and the antiferromagnetic one of Fe3+and Fe3+ions results in a unidirectional anisotropy in the cluster-glass *** antiferromagnetically interfacial exchange coupling constant Ji1.95 meV at the cluster-glass region was yielded by fitting the cooling field-dependence of the exchange bias field.

关键词： exchange bias charge disproportionation cluster glass

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of hydrogen concentration on Fe_2O_3 particle reduction in fluidized beds under constant drag force

引用

International Journal of Minerals,Metallurgy and Materials 2015年第1期22卷 12-20页

作者： Lei Guo Han Gao jin-tao Yu Zong-liang zhang zhan-cheng Guo State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

The fixed-gas drag force from a model calculation method that stabilizes the agitation capabilities of different gas ratios was used to explore the influence of temperature and hydrogen concentration on fluidizing duration, metallization ratio, utilization rate of reduction gas, and sticking behavior. Different hydrogen concentrations from 5vol%to 100vol%at 1073 and 1273 K were used while the drag force with the flow of N2 and H2 （N2：2 L·min^-1;H2：2 L·min^-1） at 1073 K was chosen as the standard drag force. The metallization ratio, mean reduc-tion rate, and utilization rate of reduction gas were observed to generally increase with increasing hydrogen concentration. Faster reduction rates and higher metallization ratios were obtained when the reduction temperature decreased from 1273 to 1073 K. A numerical relation among particle diameter, particle drag force, and fluidization state was plotted in a diagram by this model.

关键词： fluidized beds ferric oxide iron ores agglomeration hydrogen drag force

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

MDCFS: few-shot object detection with multilevel decoupled classifiers

引用

Optoelectronics Letters 2025年

作者： LI Chuanhui ZHOU Mian FENG Zhikun SUI Zezhou GAO zhan School of Computer Science and Engineering， Tianjin University of Technology

Few-shot object detection poses unique challenges as it requires effectively learning novel classes with limited labeled data. Current approaches often suffer from biases towards base classes during fine-tuning， leading to suboptimal performance on detecting novel classes. Additionally， in complex scenes， the confusion between foreground and background objects further affects the accuracy and robustness of the model. To address these issues， we propose the Multilevel Decoupling Classification Few-Shot Algorithm (MDCFS). we decouple the standard classifier into a parallel foreground classifier and a background classifier in the Few-Shot Object Detection (FSOD) setting. This decoupling enables the independent separation of positive samples from noisy negative samples， alleviating the foreground-background confusion problem commonly encountered in few-shot detectors. For Generalized Few-Shot Object Detection (G-FSOD)， where the few-shot dataset contains base classes， we further decouple the foreground classification head into a base class classification head and a novel class classification head. To ensure balance， we assign more weight to the novel class classification head， effectively addressing the bias towards base classes. Furthermore， we optimize the initial weights of the few-shot fine-tuning stage， significantly reducing training time and mitigating catastrophic forgetting in G-FSOD. Additionally， we incorporate metric learning into our model with minimal cost. Experimental results demonstrate the effectiveness of our approach. Compared to state-of-the-art few-shot object detection methods based on fine-tuning， MDCFS achieves performance improvements of up to 6.3% on the PASCAL VOC dataset and 1.5% on the COCO dataset.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Generation of global 1-km daily top-of-atmosphere outgoing longwave radiation product from 2000 to 2021 using machine learning

引用

International Journal of Digital Earth 2023年第1期16卷 2002-2012页

作者： Chuan zhan Shunlin liang School of Resources and Environmental Engineering Wuhan University of Science and TechnologyWuhanPeople's Republic of China Department of Geography The University of Hong KongPokfulamPeople's Republic of China

Top-of-atmosphere(TOA)outgoing longwave radiation(OLR),a key component of the Earth’s energy budget,serves as a diagnostic of the Earth’s climate system response to incoming solar ***,existing products are typically estimated using broadband sensors with coarse spatial *** paper presents a machine learning method to estimate TOA OLR by directly linking Moderate Resolution Imaging Spectroradiometer(MODIS)TOA radiances with TOA OLR determined by Clouds and the Earth’s Radiant Energy System(CERES)and other information,such as the viewing geometry,land surface temperature and cloud top temperature determined by Modern-Era Retrospective analysis for Research and Applications,Version 2(MERRA-2).Models are built separately under clear-and cloudy-sky conditions using a gradient boosting regression *** test results show that the root mean square errors(RMSEs)of the clear-sky and cloudy-sky models for estimating instantaneous values are 4.1 and 7.8 W/m^(2),***-time conversion ratios derived from CERES daily and hourly OLR data are used to convert the instantaneous MODIS OLR to daily ***-comparisons of the daily results show that the RMSE of the estimated MODIS OLR is 8.9 W/m^(2) in East *** developed high resolution dataset will be beneficial in analyzing the regional energy budget.

关键词： TOA outgoing longwave radiation MODIS CERES machine learning Earth’s energy budget

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：