检索结果-南通市图书馆

Sawtooth and dune auroras simultaneously driven by waves around the plasmapause

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2023年第2期7卷 237-246页

作者： Fei He ZhongHua Yao BinBin Ni Xing Cao ShengYi Ye ruilong guo JinXing Li ZhiPeng Ren XinAn Yue YongLiang Zhang Yong Wei XiaoXin Zhang ZuYin Pu Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Space Physics School of Electronic InformationWuhan UniversityWuhan 430072China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518055China Institute of Space Sciences Shandong UniversityWeihai Shandong 264209China Department of Atmospheric and Oceanic Sciences University of CaliforniaLos AngelesCaliforniaUSA Johns Hopkins University Applied Physics Laboratory LaurelMaryland 20723USA Key Laboratory of Space Weather National Center for Space WeatherChina Meteorological AdministrationBeijing 100081China Institute of Space Physics and Applied Technology Peking UniversityBeijing 100871China

The dune aurora,at a scale of~30 kilometers,was reported recently using ground *** small-scale dune aurora occurs on the duskside and exhibits a monochromatic oscillation in the auroral emission,implying fundamental energy ***,whether the dune auroras correspond to atmospheric waves or are associated with magnetospheric dynamics should be *** paper reports a dune aurora that occurred during a storm;further,we demonstrate that it was the substructure of the sawtooth aurora that was generated by plasmapause surface *** observations in the magnetospheric source region suggest that the exohiss waves,which are periodically modulated by the plasmapause surface wave-excited ultralow frequency wave,might be responsible for the generation of the dune *** reported dune aurora events have occurred simultaneously with sawtooth auroras,suggesting that both are plasmapause-driven cross-scale auroral structures.

关键词： sawtooth aurora dune aurora plasmapause surface wave exohiss

Evolution of clustered magnetic nulls in a turbulent-like reconnection region in the magnetotail

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2016年第24期61卷 1145-1150页

作者： ruilong guo Zuyin Pu Suiyan Fu Lun Xie Malcolm Dunlop Yulia V. Bogdanova Jiansen He Xin Wang Zhonghua Yao School of Earth and Space Sciences Peking UniversityBeijing 100871 China PKU/UCLA Joint Research Institute in Science and Engineering Peking University Beijing 100871 China School of Astronautics Beihang University Beijing 100191China RAL Space Rutherford Appleton Laboratory STFCDidcot OXll 0QX UK UCL Mullard Space Science Laboratory Dorking RH5 6NT UK

Magnetic null points and flux ropes play important roles in the three-dimensional process of magnetic reconnection. In this study, a cluster of null points are reconstructed in the reconnection region in the magnetotail by applying a fitting-reconstruction method to measurements from the Cluster mission. The number of reconstructed null points varies rapidly, presenting a turbulentlike evolution of the magnetic structure. The electron density and the flux of the accelerated electrons were enhanced in this turbulent-like region. During this unstable reconnection process, a B–As–B null structure was formed, showing flux rope features and resembling a secondary island in the observation.

关键词：磁重联零点演变结构演化电子密度不稳定磁通

同方期刊数据库

miR-125b reverses cisplatin resistance by regulating autophagy via targeting RORA/BNIP3L axis in lung adenocarcinoma

在线全文

学校读者我要写书评

暂无评论

Oncology Research 2024年第4期32卷 643-658页

作者： LEI LIU NA guo XIANGLING LI QIAN XU ruilong HE LIMIN CHENG CHUNYAN DANG XINYU BAI YIYING BAI XIN WANG QIANHUI CHEN LI ZHANG Department of Immunology Chengde Medical UniversityChengde067000China Department of Pathology Chengde Medical UniversityChengde067000China Department of Oncology The Affiliated Hospital of Chengde Medical UniversityChengde067000China Department of Hepatobiliary Surgery The Affiliated Hospital of Chengde Medical UniversityChengde067000China

The platinum-based chemotherapy is one of the most frequently used treatment protocols for lung adenocarcinoma(LUAD),and chemoresistance,however,usually results in treatment failure and limits its application in the *** has been shown that microRNAs(miRNAs)play a significant role in tumor *** this study,miR-125b was identified as a specific cisplatin(DDP)-resistant gene in LUAD,as indicated by the bioinformatics analysis and the real-time quantitative PCR *** decreased serum level of miR-125b in LUAD patients was correlated with the poor treatment response rate and short survival ***-125b decreased the A549/DDP proliferation,and the multiple drug resistance-and autophagy-related protein expression levels,which were all reversed by the inhibition of *** addition,xenografts of human tumors in nude mice were suppressed by miR-125b,demonstrating that through autophagy regulation,miR-125b could reverse the DDP resistance in LUAD cells,both in vitro and in *** mechanistic studies indicated that miR-125b directly repressed the expression levels of RORA and its downstream BNIP3L,which in turn inhibited autophagy and reversed *** on these findings,miR-125b in combination with DDP might be an effective treatment option to overcome DDP resistance in LUAD.

关键词： Lung adenocarcinoma miRNAs Cisplatin Resistance Autophagy

Propagation properties of foreshock cavitons: Cluster observations

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

Science China(Technological Sciences) 2020年第1期63卷 173-182页

作者： WANG MengMeng YAO ShuTao SHI QuanQi ZHANG Hui TIAN AnMin DEGELING Alexander William ZHANG Shuai guo ruilong SUN WeiJie LIU Ji BAI ShiChen SHEN XiaoChen ZHU XiaoQiong FU SuiYan PU ZuYin School of Space Science and Physics Shandong UniversityWeihai 264209China National Space Science Center Chinese Academy of SciencesBeijing 100190China Geophysical Institute University of Alaska FairbanksFairbanksAlaska 99775USA Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China Department of Climate and Space Sciences and Engineering University of MichiganAnn Arbor 48113USA Institute of Space Physics and Applied Technology Peking UniversityBeijing 100871China

Foreshock cavitons are transient phenomena observed in the terrestrial foreshock *** are characterized by a simultaneous depression of magnetic field magnitude and plasma density,which are bounded with enhancements of these two parameters and surrounded by ultralow frequency(ULF)*** studies focused on the interplanetary magnetic field(IMF)conditions,solar wind(SW)conditions,and the growth of the foreshock waves related to the generation of foreshock ***,a multipoint spacecraft analysis method using Cluster data was applied to analyze only two foreshock cavitons,and this method did not consider *** this study,multipoint spacecraft analysis methods,including the timing method,the minimum directional derivative(MDD)method,and the spatiotemporal difference(STD)method are applied to determine the velocity in both spacecraft and solar wind *** propagation properties show good agreement with previous results from simulations and observations that most cavitons move sunward in the solar wind frame,with the velocities larger than the Alfvén *** propagation properties of foreshock cavitons support the formation mechanism of cavitons in previous simulations,which suggested that cavitons are formed due to the nonlinear evolution of compressive ULF *** find that there is clear decreasing trend between the size of cavitons and their velocity in the solar wind *** addition,the timing method considering errors has been applied to study the evolution properties by comparing the velocities with errors of the leading and trailing edges,and we identify three stable cavitons and one contracting caviton,which has not been studied *** cavitons should remain stable when they travel toward the Earth’s bow *** relationship between the size of foreshock cavitons and their distance from the bow shock is also discussed.

关键词： foreshock transient phenomena cavitons nonlinear evolution of ULF waves propagation and evolution properties of structures multipoint spacecraft methods

Statistical properties of kinetic-scale magnetic holes in terrestrial space

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2021年第1期5卷 63-72页

作者： ShuTao Yao ZongShun Yue QuanQi Shi Alexander William Degeling HuiShan Fu AnMin Tian Hui Zhang Andrew Vu ruilong guo ZhongHua Yao Ji Liu Qiu-Gang Zong XuZhi Zhou JingHuan Li WenYa Li HongQiao Hu YangYang Liu WeiJie Sun Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesShandong UniversityWeihai Shandong 264209China State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China School of Space and Environment Beihang UniversityBeijing 100191China Physics Department and Geophysical Institute University of Alaska FairbanksFairbanksAK99775USA Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Laboratoire de Physique Atmosphérique et Planétaire STAR InstituteUniversitéde LiègeLiègeB-4000Belgium School of Earth and Space Sciences Peking UniversityBeijing 100871China SOA Key Laboratory for Polar Science Polar Research Institute of ChinaShanghai 200136China Department of Climate and Space Sciences and Engineering University of MichiganAnn ArborMI48109USA

Kinetic-scale magnetic holes(KSMHs)are structures characterized by a significant magnetic depression with a length scale on the order of the proton *** structures have been investigated in recent studies in near-Earth space,and found to be closely related to energy conversion and particle acceleration,wave-particle interactions,magnetic reconnection,and turbulence at the ***,there are still several major issues of the KSMHs that need further study—including(a)the source of these structures(locally generated in near-Earth space,or carried by the solar wind),(b)the environmental conditions leading to their generation,and(c)their spatio-temporal *** this study,KSMHs in near-Earth space are investigated statistically using data from the Magnetospheric Multiscale *** 200,000 events were observed from September 2015 to March *** rates of such structures in the solar wind,magnetosheath,and magnetotail were *** find that KSMHs occur in the magnetosheath at rates far above their occurrence in the solar *** indicates that most of the structures are generated locally in the magnetosheath,rather than advected with the solar ***,KSMHs occur in the downstream region of the quasi-parallel shock at rates significantly higher than in the downstream region of the quasi-perpendicular shock,indicating a relationship with the turbulent plasma *** to the magnetopause,we find that the depths of KSMHs decrease as their temporal-scale *** also find that the spatial-scales of the KSMHs near the subsolar magnetosheath are smaller than those in the ***,their global distribution shows a significant dawn-dusk asymmetry(duskside dominating)in the magnetotail.

关键词： kinetic scale magnetic hole magnetic dip electron vortex turbulence

在线全文

学校读者我要写书评

暂无评论

一种基于行为关联的主机系统入侵检测方法

高技术通讯 2012年第9期22卷 897-903页

作者：王映龙李京春王少杰锁延锋梁利郭瑞龙江西农业大学软件学院南昌330045 国家信息技术安全研究中心北京100084 北京科技大学信息工程学院北京100083

提出了一种基于主机行为解析和行为关联分析的主机系统入侵检测方法，对嵌入式恶意软件具有较高的检测效率，可应用于基于网络行为的入侵检测系统。通过对行为进行深层次的解析，建立了行为间的关联关系模型，在降低存储异常行为样本规... 详细信息

提出了一种基于主机行为解析和行为关联分析的主机系统入侵检测方法，对嵌入式恶意软件具有较高的检测效率，可应用于基于网络行为的入侵检测系统。通过对行为进行深层次的解析，建立了行为间的关联关系模型，在降低存储异常行为样本规模的同时，提高了该方法的灵活性和应用范围。实验结果显示，与现有的异常行为检测方法相比，该方法需要较长的训练时间，但是，通过调整行为粒度，该方法可以使训练时间保持在合理的范围之内。随着时间的推进，该方法的性能将逐步提高，在漏报率、误报率及更新效率上，较现有系统都有较大的提高。

关键词：关联分析主机系统入侵检测系统(IDS)

改性催化裂化催化剂废渣在润滑油补充精制中的应用

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

石油化工 2014年第12期43卷 1388-1393页

作者：吴乐乐郭瑞龙邓文安李传中国石油大学(华东)重质油国家重点实验室山东青岛266580

采用盐酸对催化裂化(FCC)催化剂废渣进行改性,并用于润滑油的补充精制,利用XRF和FTIR等方法分析了FCC催化剂废渣改性前后的性质,并考察了精制条件对润滑油精制效果的影响。实验结果表明,FCC催化剂废渣改性后,比表面积增大、孔体积略有... 详细信息

采用盐酸对催化裂化(FCC)催化剂废渣进行改性,并用于润滑油的补充精制,利用XRF和FTIR等方法分析了FCC催化剂废渣改性前后的性质,并考察了精制条件对润滑油精制效果的影响。实验结果表明,FCC催化剂废渣改性后,比表面积增大、孔体积略有增加、活性度提高。改性FCC催化剂废渣用于润滑油精制时,较适宜的精制条件为:FCC催化剂废渣用量(基于润滑油质量)10%(w)、精制温度100℃、精制时间30 min、搅拌转速100 r/min。采用溶剂抽提法对含油改性FCC催化剂废渣进行再生和二次改性,再生FCC催化剂废渣经二次改性后仍对润滑油具有良好的精制效果。循环使用FCC催化剂废渣有利于降低生产成本及对环境的污染。

关键词：催化裂化催化剂废渣润滑油补充精制改性

在线全文

学校读者我要写书评

暂无评论

二三维数据在警务系统的应用

测绘通报 2019年第S1期 129-132页

作者：程小囡郭瑞隆付瑞锋中煤(西安)地下空间科技发展有限公司陕西西安710199 陕西省地理空间信息工程技术研究中心陕西西安710199

主要以西安市航天基地公安局警务大数据系统项目为例,介绍了该系统的开发背景及应用,阐述了基于Supermap平台将倾斜摄影实景模型、数字高程模型(DEM)、数字正射影像图(DOM)、1∶1000大比例尺地形图,以及公安系统提供的特殊信息数据,监... 详细信息

主要以西安市航天基地公安局警务大数据系统项目为例,介绍了该系统的开发背景及应用,阐述了基于Supermap平台将倾斜摄影实景模型、数字高程模型(DEM)、数字正射影像图(DOM)、1∶1000大比例尺地形图,以及公安系统提供的特殊信息数据,监控传感器等不同类型的数据进行融合,以实现警务大数据平台的专题应用。

关键词：警务应用数据融合二维电子地图三维数据

在线全文

学校读者我要写书评

暂无评论

城市地下综合管廊的三维模型建设

测绘标准化 2018年第3期34卷 58-60页

作者：潘雅静郭瑞隆中煤航测遥感集团有限公司陕西西安710100

采用移动三维激光扫描仪(IMS3D),基于同步定位与制图(SLAM)技术快速获取综合管廊三维点云数据,依据点云数据建立城市地下综合管廊的三维模型,实现综合管廊的三维可视化,为城市地下建设规划提供强有力的数据支持。

关键词：地下综合管廊移动三维激光扫描仪点云数据三维模型三维可视化