检索结果-南通市图书馆

Joint observations of the large-scale ULF wave activity from space to ground associated with the solar wind dynamic pressure enhancement

引用

Science China Technological Sciences 2024年第7期67卷 2215-2229页

作者： SUN XiaoYing HU YunPeng ZHIMA Zeren duan SuPing LV FangXian SHEN xuhui National Institute of Natural Hazards Ministry of Emergency Management School of Space and Environment Beihang University State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences

This study reports the rare ultralow-frequency(ULF) wave activity associated with the solar wind dynamic pressure enhancement that was successively observed by the GOES-17(Geostationary Operational Environmental Satellite) in the magnetosphere, the CSES(China Seismo-Electromagnetic Satellite) in the ionosphere, and the THEMIS ground-based observatories(GBO) GAKO and EAGL in the Earth's polar region during the main phase of an intense storm on 4 November 2021. Along with the enhanced-pressure solar wind moving tailward, the geomagnetic field structure experienced a large-scale change. From dawn/dusk sides to midnight, the GAKO, EAGL, and GOES-17 sequentially observed the ULF waves in a frequency range of0.04–0.36 Hz at L shells of ～5.07, 6.29, and 5.67, respectively. CSES also observed the ULF wave event with the same frequency ranges at wide L-shells of 2.52–6.22 in the nightside ionosphere. The analysis results show that the ULF waves at ionospheric altitude were mixed toroidal-poloidal mode waves. Comparing the ULF waves observed in different regions, we infer that the nightside ULF waves were directly or indirectly excited by the solar wind dynamic pressure increase: in the area of L-shells～2.52–6.29, the magnetic field line resonances(FLRs) driven by the solar wind dynamic pressure increase is an essential excitation source; on the other hand, around L～3.29, the ULF waves can also be excited by the outward expansion of the plasmapause owing to the decrease of the magnetospheric convection, and in the region of L-shells ～5.19–6.29, the ULF waves are also likely excited by the ion cyclotron instabilities driven by the solar wind dynamic pressure increase.

关键词： ultralow-frequency (ULF) wave solar wind dynamic pressure (Psw) magnetic field line resonance (FLR) ion cyclotron instability

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

Thermal Transport across Polyethylene Chains

引用

Journal of Thermal Science 2022年第4期31卷 1061-1067页

作者： YANG Cong duan xuhui ZHOU Jun LIU Jun LI Xiaobo School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan 430074China Department of Mechanical and Aerospace Engineering North Carolina State University Raleigh 27695USA NNU-SULI Thermal Energy Research Center&Center for Quantum Transport and Thermal Energy Science School of Physics and Technology Nanjing Normal Universityanjing 210023China

In polymers,heat could transfer efficiently along the long polymer chains;however due to the finite length of polymer chains,such heat eventually has to pass across the chain-chain boundary which is less effective in heat transfer.This paper investigated the thermal transport across polyethylene chains with molecular dynamics(MD)simulations.Thermal transport across two polymer chains overlapping with each other is studied with different chain length(75 nm,150 nm and 251 nm)and chain-chain overlapping length.The results show that with increasing overlapping length,the total thermal conductance across the two chains exhibits maximum value,which is due to the increasing thermal resistance along the chains and the decreasing inter-chain thermal boundary resistance.Mathematically,we show that the total thermal resistance can be decomposed into two terms.The coupling term related to the inter-chain thermal resistance tends to saturate even with long overlapping length.

关键词： phonon transport polymer polyethylene thermal resistance van der Waals interaction

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

High-performance Ag_(2)BiI_(5)Pb-free perovskite photodetector

引用

Photonics Research 2022年第8期10卷 1886-1891页

作者： ZIHAO SHUANG HAI ZHOU DINGJUN WU xuhui ZHANG BOAO XIAO JINXIA duan HAO WANG International School of Microelectronics Dongguan University of TechnologyDongguan 523808China Hubei Yangtze Memory Laboratories Wuhan 430205China School of Microelectronics Hubei UniversityWuhan 430062China

Recently,lead-free all-inorganic halide perovskites have attracted great interest because they not only have the merits of the halide perovskite family,but also are non-toxic.However,the commercialization of lead-free allinorganic perovskites is restricted by their relatively low performances,which are usually caused by the fabrication methods and undesirable interfaces between the active layer and carrier transport layers.Herein,we demonstrate a solution-processed route for high-quality Ag_(2)BiI_(5) lead-free perovskite film by adopting ideal electron transport material SnO_(2)and a carbon electrode.By optimizing the fabrication process and tailoring the composition of the perovskite active layer,a high-performance photodetector(PD)with an FTO∕SnO_(2)∕Ag_(2)BiI_(5)∕carbon structure PD is first fabricated,which shows good self-powered performance with a detectivity of as high as 5.3×10^(12)Jones and a linear dynamic range of up to 138 d B,which are better than those of the reported Pb-free perovskite PDs and comparable to high-performance Pb-based perovskite PDs.In addition,our unpackaged PDs show good light,thermal,and storage stability in air.Our results provide a special route for the development of lead-free perovskite devices in an environmentally friendly field.

关键词： field. perovskite performance

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

泛影葡胺阴道残端标记物对宫颈癌术后放疗剂量的影响

引用

辐射研究与辐射工艺学报 2024年第3期42卷 63-68页

作者：王旭高力英刘炳涛孟跃曹月鳌缪国英朱宝玉康斌厚龙进段旭辉郑长才甘肃省妇幼保健院/甘肃省中心医院兰州730000

探讨泛影葡胺阴道残端标记物对宫颈癌术后放疗剂量分布的影响。收集2022年7月至2023年7月甘肃省妇幼保健院/甘肃省中心医院行宫颈癌根治术后放疗且定位前放置泛影葡胺显影棉球标记阴道残端的患者12例,行容积旋转调强计划设计,得到计划Pl... 详细信息

探讨泛影葡胺阴道残端标记物对宫颈癌术后放疗剂量分布的影响。收集2022年7月至2023年7月甘肃省妇幼保健院/甘肃省中心医院行宫颈癌根治术后放疗且定位前放置泛影葡胺显影棉球标记阴道残端的患者12例,行容积旋转调强计划设计,得到计划PlanA,作为实际治疗计划。将被泛影葡胺显影的阴道残端区域的相对电子密度值替换为正常阴道壁的相对电子密度值,保持计划优化参数不变,重新计算得到Plan B。比较两组计划各评价指标及剂量分布的差异。结果显示:Plan B较PlanA组HI(1.048 vs.1.047)指数略差,CI(0.870 vs.0.868)指数更优;Plan B的PTV平均剂量(46.48 vs.46.47)和阴道残端剂量(47.14 vs.46.45)高于PlanA,直肠最小剂量(6.42 vs.6.49)低于PlanA。结果提示,泛影葡胺阴道残端标记物对剂量分布造成的影响可忽略不计。

关键词：宫颈癌术后泛影葡胺阴道残端标记物剂量分布

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

Effect of different surface treatment agents on the physical chemistry and electrical properties of polyethylene nano-alumina nanocomposites

引用

High Voltage 2020年第4期5卷 397-402页

作者： xuhui duan Wah Hoon Siew Martin Given John Liggat Jinliang He Department of Electronic and Electrical Engineering University of Strathclyde204 George StreetGlasgow G11XWUK Department of Pure and Applied Chemistry University of Strathclyde295 Cathedral StreetGlasgow G11XLUK State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing 10084People's Republic of China

Generally,the electrical properties of nanocomposite are affected by the type,size,filling concentration and surface treatment process of the nanoparticle.In this study,nanocomposites of polyethylene(PE)with varying filling contents of nanoalumina particles were prepared by the melting blending method and three different kinds of coupling agents were applied for surface modification properties of the nanoparticles.Two of them were silane based and the other was titanate based.The effect of different coupling agents on the dielectric properties was studied.Fourier-transform infrared spectroscopy and thermo-gravimetric analysis were used to verify their compositions.Scanning electron microscope and polarised optical microscopy were used for morphology study.Dielectric permittivity,direct current(DC)volume resistivity and DC breakdown strength characterised their improved insulation performance with nano-alumina as filler.Thermal stimulated current results revealed that adding nano-alumina particles into low-density PE could provide more deep traps and increase DC resistivity.

关键词： electrical resistivity adding

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

基于DeepAR的短期风速概率预测

引用

铁道学报 2023年第7期45卷 152-160页

作者：何旭辉段泉成严磊中南大学土木工程学院湖南长沙410075 高速铁路建造技术国家工程实验室湖南长沙410075 轨道交通工程结构防灾减灾湖南省重点实验室湖南长沙410075

为对铁路沿线风速提前进行预判,保障桥梁施工及高速铁路列车运行时的安全,提出基于深度自回归模型(DeepAR)的短期风速预测方法。采用平潭海峡公铁两用大桥和西堠门大桥实测风速进行验证,并以包括小波包分解下的卷积神经网络和循环神经... 详细信息

为对铁路沿线风速提前进行预判,保障桥梁施工及高速铁路列车运行时的安全,提出基于深度自回归模型(DeepAR)的短期风速预测方法。采用平潭海峡公铁两用大桥和西堠门大桥实测风速进行验证,并以包括小波包分解下的卷积神经网络和循环神经网络混合模型(WPD-CNNLSTM-CNN)在内的4种模型作为点预测对比模型,以SimpleFeed-Forward、ARIMA、Random Walk模型进行置信度为50%与95%的区间预测作为对比模型。研究结果表明:无论是点预测还是区间预测,DeepAR模型都能够在具有随机性、间歇性的短期风速序列中提取到特征信号并进行精度较高的预测,且相比于其他模型具有更好的准确性与泛化能力,可满足实际工程短期风速预测需求。

关键词：铁路桥梁短期风速 DeepAR模型点预测区间预测

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

格子玻尔兹曼正则化碰撞模型的理论进展

引用

空气动力学学报 2022年第3期40卷 46-64,I0001页

作者：李旭晖单肖文段文洋哈尔滨工程大学船舶工程学院哈尔滨150001 南方科技大学力学与航空航天工程系深圳518055

数值稳定性问题一直是困扰格子玻尔兹曼方法在高雷诺数高马赫数流动中广泛应用的瓶颈。在格子玻尔兹曼方法领域改良碰撞模型的数值稳定性和精度一直是近30年来的研究难点和热点。正则化碰撞模型作为众多碰撞模型的一个重要分支,近几年... 详细信息

数值稳定性问题一直是困扰格子玻尔兹曼方法在高雷诺数高马赫数流动中广泛应用的瓶颈。在格子玻尔兹曼方法领域改良碰撞模型的数值稳定性和精度一直是近30年来的研究难点和热点。正则化碰撞模型作为众多碰撞模型的一个重要分支,近几年来取得了重要理论进展,目前已在高雷诺数湍流模拟、高马赫数可压缩流动以及气动声学领域得到了广泛应用。本文系统地回顾了正则化碰撞模型的发展历史,并建立了一个系统的理论框架阐述不同正则化碰撞模型之间的理论联系。同时,揭示了正则化多松弛碰撞模型的理论本质,就是在与坐标无关且自相似的矩空间中将离散格子模型表达不了的高阶动理学矩进行快速松弛,以避免虚假模态对水动力学方程的影响。

关键词：格子玻尔兹曼方法正则化碰撞模型数值稳定性虚假模态

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

Corneal histomorphology and electron microscopic observation of R124L mutated corneal dystrophy in a relapsed pedigree

引用

International Journal of Ophthalmology(English edition) 2022年第9期15卷 1416-1422页

作者： Meng-Jun Fu Jing Zhao Shan duan Hao-Run Zhang Jing-Jing Zhao Li Zeng Rui Wang Xing-Tao Zhou Department of Refractive Surgery Center Weifang Eye HospitalWeifang 261000Shandong ProvinceChina State Key Laboratory of Ophthalmology Optometry and Visual ScienceEye Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina National Clinical Research Center for Ocular Diseases Eye Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina Eye Institute and Department of Ophthalmology Eye&ENT HospitalFudan UniversityShanghai 200031China NHC Key Laboratory of Myopia(Fudan University) Key Laboratory of MyopiaChinese Academy of Medical SciencesShanghai 200031China Shanghai Research Center of Ophthalmology and Optometry Shanghai 200000China Laboratory of Molecular Medicine Institute of Maternal and Child MedicineShenzhen Maternity and Child HealthcareHospitalSouthern Medical UniversityShenzhen 518040Guangdong ProvinceChina

·AIM:To investigate the histological characteristics and ultrastructure of recurrent Chinese R124 L mutated corneal dystrophy after keratoplasty.·METHODS:The subjects were enrolled from a Chinese family of corneal dystrophy with R124 L heterozygous gene mutation and with a history of consanguineous marriage.Normal corneal samples were used as controls.·RESULTS:In this family,2 patients(3 eyes)underwent penetrating keratoplasty(PKP)and 2 patients(4 eyes)underwent lamellar keratoplasty(LKP).They had recurrence at 33.5±3.0(range 30-36)mo after keratoplasty.Among them,1 patient(1 eye)underwent PKP again and 1 patient(2 eyes)underwent LKP again.In the R124 L mutated recurrent corneal dystrophy,the corneal turbidity was mainly distributed from the upper corneal cortex to the anterior stroma;the corneal epithelium surface was rougher and more uneven;and,the corneal erosions were larger.Hematoxylin-eosin staining showed that the thickness of the corneal epithelium was uneven;the arrangement of the epithelial cells was disordered;and,some corneal epithelial cells were swollen.The results of Congo red staining,Masson’s trichrome staining and Periodic acid-Schiff staining were positive,while that of Alcian blue staining was negative.Under a transmission electron microscope,deposition of high electron density substances between epithelial and basal cells,and,apoptosis of basal cells were observed.Many high electron density depositions were observed in the sub-epithelial and anterior corneal matrix.·CONCLUSION:In the Chinese family of recurrent corneal dystrophy with R124 L gene mutation,the corneal epithelia of the recurrent cases are rougher,and the corneal depositions are extra cellular amyloid fibrin.

关键词： corneal dystrophy R124L mutation electron microscope observation pathology

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

浙江外岗银多金属矿床热液蚀变短波红外光谱分析及找矿指示

引用

矿床地质 2022年第1期41卷 174-188页

作者：王旭辉段士刚孙鹏翟世达张炎中国地质大学地质过程与矿产资源国家重点实验室地球科学与资源学院北京100083 中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室北京100037

中国东南沿海浙闽交界地区发现大量银多金属矿床,这些矿床以石英脉状矿化为主,并伴有明显的热液蚀变作用,关于其成因和控矿因素尚不清楚。文章以其中的外岗银多金属矿床为研究对象,开展了短波红外光谱测量(SWIR),提取蚀变矿物种类、组... 详细信息

中国东南沿海浙闽交界地区发现大量银多金属矿床,这些矿床以石英脉状矿化为主,并伴有明显的热液蚀变作用,关于其成因和控矿因素尚不清楚。文章以其中的外岗银多金属矿床为研究对象,开展了短波红外光谱测量(SWIR),提取蚀变矿物种类、组合信息,划分蚀变矿物分带,分析矿化强度与蚀变矿物组合及分带的关系。短波红外光谱测量识别出的蚀变矿物主要有多硅白云母、伊利石、白云母、高岭石、铁绿泥石、铁镁绿泥石,这些矿物及其组合在水平方向上,自矿体由内而外形成了硅化带→青磐岩化带→泥化带的分带。通过对伊利石反射光谱特征参数的计算发现,伊利石结晶度(Illite crystallinity value,简称"IC值")和Al-OH 2200 nm特征峰吸收峰位值(Pos2200)在矿区内出现系统性的变化规律,即越靠近热液/矿化中心,IC值逐渐增大(>1.5),Al-OH 2200 nm吸收峰位值有减小的趋势(Pos2200≈2208 nm),将二者叠加的区域即可作为外岗地区勘查该类矿床的找矿重点区域。作者认为短波红外光谱技术可以有效地指导矿产勘查评价、降低勘查成本,在未来同类矿床找矿方面有良好的应用前景。

关键词：地质学短波红外热液蚀变绢云母伊利石外岗银矿床

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

浙江泰顺龟湖叶腊石矿床热液蚀变短波红外光谱分析

引用

矿床地质 2022年第1期41卷 189-201页

作者：翟世达段士刚孙鹏王旭辉张炎梅世勇中国地质大学地质过程与矿产资源国家重点实验室地球科学与资源学院北京100083 中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室北京100037 浙江龟湖矿业有限公司浙江泰顺325508

蚀变岩帽与斑岩体关系密切,具有形成斑岩-浅成低温热液型矿床的潜力。位于浙闽交界的龟湖地区发育规模巨大的蚀变岩帽(>30 km^(2)),形成了龟湖超大型叶腊石矿床,矿体属于岩帽的一个分带。矿床及其围岩蚀变主要由粒度微小或隐晶质的层状... 详细信息

蚀变岩帽与斑岩体关系密切,具有形成斑岩-浅成低温热液型矿床的潜力。位于浙闽交界的龟湖地区发育规模巨大的蚀变岩帽(>30 km^(2)),形成了龟湖超大型叶腊石矿床,矿体属于岩帽的一个分带。矿床及其围岩蚀变主要由粒度微小或隐晶质的层状硅酸盐蚀变矿物组成,矿物之间差别极为细微,仅凭肉眼难以区分。短波红外光谱技术可以有效识别这些蚀变矿物的组成。因此,文章以龟湖超大型叶腊石矿床为例,通过短波红外光谱测量,对蚀变矿物进行了精细研究,通过对矿区网格化采样及短波红外光谱分析,识别出以叶腊石、钠云母、白云母、高岭石为主的17种含羟基官能团蚀变矿物,并将矿区地表蚀变划分为硅化带、高级泥化带和泥化带3个相带。在矿区范围,绢云母光谱特征参数Pos2200低值区与IC高值区主要分布在硅化和高级泥化带中,指示了较高的蚀变温度;叶腊石光谱特征参数Pos1400与Pos2160半高宽低值区与绢云母特征参数异常值区域一致。以上指标异常值区域在矿区仰天湖东南约300 m处重合,可能存在热液中心。龟湖蚀变岩帽与福建紫金山高硫型浅成低温热液矿床具有高度相似的蚀变分带特征,文章认为该蚀变岩帽具有形成斑岩-浅成低温热液矿床的潜力。

关键词：地质学短波红外热液蚀变叶腊石绢云母非金属矿床

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

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：