检索结果-南通市图书馆

Petrogenesis, geochemistry and geological significance of Paleocene Granite in South Gangdese, Tibet

Acta Geochimica 2019年第6期38卷 883-896页

作者： Chengzhi Li Wenguang Yang lidong zhu Zhen Yang Limin Lin Xin Su Hongliang Zhang School of Earth Sciences Chengdu University of TechnologyChengdu 610059China Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China No.282 Brigade Sichuan Bureau of Geology for Nuclear IndustryDeyang 618000SichuangChina

The Gangdese magmatic belt,located along the southern margin of the Lhasa terrane,plays a critical role in understanding the tectonic framework associated with the Indian-Asian slab *** this paper,a chronology of zircon U-Pb and geochemical analysis of the rock of the Cuobulaguo granitic mass in the southern of the Gangdese,Tibet,revealed a series of *** results show that the LA-ICP-MS monzonitic granite zircon U-Pb ages are 61-59 Ma,which corresponds to the same period as the magmatic arc of the southern limit of *** terms of geochemical composition,the granite is rich inω(SiO2)70.09%to 72.64%,with a highω(Al2O3)14.40%to 15.99%,a lowω(TiO2)0.08%to 0.24%,ω(MgO)0.41%to 0.76%,ω(Fe2O)6.82%to 29.9%,ω(P2Os)0.07%to 0.12%,andω(CaO)1.06%to 1.75%.The granite mainly belongs to the high-K calc-alkaline *** light rare earth element(LREE)content of skeletal granite is between 133.69×10^-6〜226.64×10^-6 and the heavy rare earth element(HREE)content is between 17.36×10^-6 and 32.11×10^-***/HREE is between 5.05 and *** is enriched in light rare earth elements(LREE)and large ion lithophile elements,such as Rb,K,U,etc.,depletes high field strength elements,such as P,Nb,and Ta,and has the geochemical composition of arc magmatic *** addition,the aluminum saturation index(A/CNK=1.06 to 1.11)of Cuobulaguo granite,belongs toⅠ-type *** comprehensive analysis showed that with the beginning of the collision between the Indian-Asian continental,the subduction ocean plate was separated from the continental plate due to gravity,resulting in an increase in the asthenosphere,which made partial fusion of the lithospheric *** invaded the bottom of the lower crust,which in turn induced a partial melting of the lower crust to form granite.

关键词： Petrogenesis Zircon U-Pb dating Cuobulaguo granite South margin of Gangdese Tibet

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

Cenozoic Vertical-Axis Rotations of the Hoh Xil Basin, Central–Northern Tibet

引用

Acta Geologica Sinica(English Edition) 2016年第3期90卷 858-869页

作者： RAN Bo ZHAO Xixi LIU Zhifei WANG Chengshan zhu lidong JIN Wei LI Yalin State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China Department of Earth and Planetary Sciences University of CaliforniaSanta CruzCA 95064USA State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesBeijing 100083China Exploration and Development Research Institute of Daqing Oilfield Company Ltd. Daqing 163712China

Understanding the Cenozoic vertical-axis rotation in the Tibetan Plateau is crucial for continental dynamic evolution. Paleomagnetic and rock magnetic investigations were carried out for the Oligocene and Miocene continental rocks of the Hoh Xii basin in order to better understand the tectonic rotations of central Tibet. The study area was located in the Tongtianhe area located in the southern part of the Hoh Xil basin and northern margin of the Tanggula thrust system in central-northern Tibet. A total of 160 independently oriented paleomagnetic samples were drilled from the Tongtianhe section for this study. The magnetic properties of magnetite and hematite have been recognized by measurements of magnetic susceptibility vs. temperature curves and unbiocking temperatures. The mean directions of the Oligocene Yaxicuo Group in stratigraphic coordinates （Declination/Inclination = 354.9°/29.3°, k = 33.0, a9s = 13.5°, N =5 Sites） and of the Miocene Wudaoliang Group in stratigraphic coordinates （Declination/Inclination = 3.60/36.4°, k = 161.0, a9s = 9.7°, N =3 Sites） pass reversal tests, indicating the primary nature of the characteristic magnetizations. Our results suggested that the sampled areas in the Tuotuohe depression of the Hoh Xil basin have undergone no paleomagnetically detectable rotations under single thrusting from the Tanggula thrust system. Our findings, together with constraints from other tectonic characteristics reported by previous paleomagnetic studies, suggest tectonic rotations in the Cuoredejia and Wudaoliang depressions of the Hoh Xil basin were affected by strike-slip faulting of the Fenghuo Shan-Nangqian thrust systems. A closer examination of geological data and different vertical-axis rotation magnitudes suggest the tectonic history of the Hoh Xil basin may be controlled by thrust and strike-slip faulting since the Eocene.

关键词： Tibetan Plateau Hoh XU basin Vertical-axis rotation Cenozoic

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

Zircon U-Pb age and geochemical characteristics of granodiorites from the western Qilian block

引用

Acta Geologica Sinica(English Edition) 2017年第S1期91卷 88-89页

作者： OUYANG Huizi LI Zhiwu zhu lidong YANG Wenguang TAO Gang Institute of Sedimentary Geology Chengdu University of TechnologyChengduSichuan 610059

1 Introduction Qilian Block is located in between the South China Craton and the North China Craton and the Tarim Craton(Fig.1a),which is one of the key area to study the tectonic evolution of *** Phanerozoic tectonic... 详细信息

关键词： Pb In Zircon U-Pb age and geochemical characteristics of granodiorites from the western Qilian block

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

Late Triassic bivalves associated with a hydrothermal vent system in the Yidun Island Arc (SW China) of the eastern Tethys

引用

Science China Earth Sciences 2011年第12期54卷 1864-1870页

作者： LIN Li zhu lidong PANG YanChun SHA JinGeng Franz T. FURSICH FU XiuGen WANG XinLi Institute of Sedimentary Geology Chengdu University of Technology Chengdu 610059 China Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China Institutfur Palaontologie der Universitat Wurzburg Pleicherwall 1 D-97070 Wiirzburg Germany Chengdu Institute of Geology andMineral Resource Chengdu 610081 China School of Earth Science and Mineral Resources China University ofGeosciences Beijing 100083 China

The Yidun Island Arc in the Three Rivers (Jinsha River, Lancang River, Nujiang River) region of southwestern China is one of the most important Kuroko-type volcanogenic massive sulfide deposits (VMS) in China. Intra-arc rifting of Yidun Island occurred during the Late Carnian-Norian when VMS deposits such as the Gacun Pb-Zn-Cu deposit were formed. A bivalve fauna was found in fine-grained tuffaceous slate and in mineralized tuffaceous siltstone containing very high contents of Pb (45.01-103.37 ppm) and Zn (135.78-300.03 ppm) of the upper Tumugou Formation in the Changtai-Gacun volcanic-sedimentary rift basin. Stratigraphically, the bivalve-bearing beds are equivalents of the Gacun Pb-Zn-Cu deposits. The diversity of this bivalve fauna is very low. It consists mainly of the thin-shelled, epibyssate suspension-feeding bivalves Pergamidia eumenea and Parapergamidia changtaiensis, the burrowing large, elongated, suspension-feeding Trigonodus keuperinus and Unionites? sp., and occasional specimens of the endobyssate suspension-feeding Trigonodus? sp. and the deep burrowing suspension-feeding Pleuromya markiamensis. Individuals of the first four taxa are so abundant that the specimens are sometimes concentrated in shell beds, probably indicating a gregarious habit. This bivalve fauna is associated with internal moulds of cylindrical, slightly conical tubes most likely produced by a worm-shaped organism. Composition, morphology, diversity, and high abundance of this fauna, chemical features of the surrounding sediment, and the tectonic setting all suggest that this bivalve fauna lived in a deep-water environment in or around a hydrothermal vent system.

关键词： Late Triassic hydrothermal vents bivalves Yidun Island Arc of the eastern Tethys

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

卫星通信干扰信号识别技术研究现状及展望

引用

太赫兹科学与电子信息学报 2024年第3期22卷 227-239页

作者：陈凤李聪朱立东吴琦乐秀权戴志坚电子科技大学通信抗干扰全国重点实验室四川成都611731 中国空间技术研究院通信与导航卫星总体部北京100094 电子科技大学(深圳)高等研究院广东深圳518110

随着通信技术的发展,卫星通信系统面临着日益严重的干扰问题以及干扰识别技术的挑战。针对这一现状,介绍了常见的卫星干扰信号样式及卫星干扰信号的发展趋势,分别从基于特征提取的干扰识别方法、传统机器学习方法以及深度学习方法3个方... 详细信息

随着通信技术的发展,卫星通信系统面临着日益严重的干扰问题以及干扰识别技术的挑战。针对这一现状,介绍了常见的卫星干扰信号样式及卫星干扰信号的发展趋势,分别从基于特征提取的干扰识别方法、传统机器学习方法以及深度学习方法3个方面介绍了卫星干扰信号分类识别技术的研究现状,分析了其各自的优势与不足。最后对未来卫星干扰信号分类识别技术进行了展望。

关键词：卫星通信干扰样式干扰识别深度学习

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

Discovery of ~409 Ma Amphibolite in the Zhikong-Songduo Subduction Complex,Southern Tibet

引用

Acta Geologica Sinica(English Edition) 2021年第2期95卷 699-701页

作者： XIE Long zhu lidong YANG Wenguang WANG Gang LU Zhiyou MAI Yuanjun ZHONG Yao ZHANG Hongliang Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China College of Earth Science Chengdu University of TechnologyChengdu 610059China School of Environment and Resource Southwest University of Science and TechnologyMianyangSichuan 621010China

Objective Discovery of Songduo eclogites exposed in southern Tibet has attracted wide attention from *** recently completed regional geological surveys show that a lithotectonic belt extends at least 100 km from Zhikong in the west to Songduo in the east and is mainly composed of oceanic fragments such as eclogites,blueschists,ophiolites and oceanic island assemblages,with their associated arc igneous and metasedimentary *** is referred to hereafter as the Zhikong-Songduo(ZS)subduction complex.

关键词： oceanic sedimentary island

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

Effects of Optimized Operating Parameters on Combustion Characteristics and NO_(x)Emissions of a Burner based on Orthogonal Analysis

引用

Journal of Thermal Science 2021年第4期30卷 1212-1223页

作者： XU Qian AKKURT Nevzat YANG Gang zhu lidong SHI Kejian WANG Kang ZOU Zhenwei LIU Zhihui WANG Jiulong DU Zhiwei School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory for Energy Conservation and Emission Reduction for Metallurgical Industry Beijing 100083China Department of Mechanical Engineering Munzur UniversityTunceli 62000Turkey Department of Big Data Technology and Application Development Computer Network Information CenterChinese Academy of SciencesBeijing 100190China AVIC Xinxiang Aviation Industry(group)CO. LTDHenan 453002China

To optimize the structure of the burner,improve the combustion performance,and reduce the emission of NO_(x),a self-circulating low NO_(x)combustion technology was used to design a new type of flue gas self-circulating low NO_(x)*** on previous research on the numerical model of combustion and the composition of mixed gas on combustion and NO_(x)emissions,the effect of various factors on the ejection coefficient of the flue gas self-circulating structure was analyzed using the orthogonal test method,and the burner operating parameters,such as preheating temperature and excess air coefficient,were deeply studied through the three-dimensional finite element numerical model in this *** results show that the diameter ratio of the nozzle and the length of the cylindrical section of the flue gas self-circulating structure have great influence on its ejection and mixing *** optimal ejection coefficient was ***,the amount of NO_(x)emissions greatly increased from 6.23×10^(-6)(volume fraction)at the preheating temperature 973 K to 3.5×10^(-3)at preheating temperature 1573 *** the excess air coefficient decreased from 1.2 to 1,the maximum combustion temperature decreased from 2036.3 K to 1954.22 K,and the NO_(x)emissions decreased from 352.29×10^(-6)to 159.73×10^(-6).

关键词： preheating temperature excess air coefficient self-circulating flue gas low oxygen combustion low-NO_(x)emissions

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

Breakthrough in room-temperature plastic ceramic

引用

Science China Materials 2024年第6期67卷 2042-2044页

作者： lidong Chen State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Centre of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The pursuit of structural materials that embody both high strength and significant plastic deformability is pivotal to ensuring safety and reliability across diverse ***,achieving this dual characteristic within a single material has long posed a formidable challenge in the realm of materials ***,renowned for their excellent plasticity facilitated by the delocalization of valence electrons.

关键词： strength ceramic pursuit

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

基于卡尔曼和扩展卡尔曼滤波的耦合载波跟踪方法

引用

移动通信 2024年第1期48卷 118-124页

作者：付学瀚燕贺云朱立东蒯小燕郭孟泽电子科技大学通信抗干扰全国重点实验室四川成都611731

鉴于低信噪比高动态环境下的载波跟踪过程中,接收信号存在显著的各阶频偏变化率,故提出了一种基于卡尔曼和扩展卡尔曼滤波的耦合载波跟踪方法。载波跟踪通过基于卡尔曼滤波的锁频环辅助基于扩展卡尔曼滤波的锁相环来实现,对频率斜升信... 详细信息

鉴于低信噪比高动态环境下的载波跟踪过程中,接收信号存在显著的各阶频偏变化率,故提出了一种基于卡尔曼和扩展卡尔曼滤波的耦合载波跟踪方法。载波跟踪通过基于卡尔曼滤波的锁频环辅助基于扩展卡尔曼滤波的锁相环来实现,对频率斜升信号和频率加速信号分别进行了载波跟踪环路结构的分析,得到系统方程,并进行了载波跟踪系统性能仿真。经仿真验证,在信噪比为-20 dB条件下,该方法跟踪频率斜升信号收敛时间小于60 ms,跟踪频率加速信号收敛时间小于90 ms,对两种信号的频率跟踪残差均小于5 Hz,相位跟踪残差均小于0.25rad,跟踪性能显著优于传统环路。

关键词：高动态载波跟踪低信噪比卡尔曼滤波扩展卡尔曼滤波

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

GUEST EDITORIAL

引用

China Communications 2022年第7期19卷 3-5页

作者： lidong zhu Michele Luglio Gengxin Zhang Mingchuan Yang University of Electronic Science and Technology of China University of Rome “Tor Vergata” Nanjing University of Posts and Telecommunications Communication Research Center Harbin Institute of Technology

Satellite-terrestrial integrated(STI) systems represent the right solution to meet complex requirements of several services and sharing of the limited spectral resources between satellite systems and terrestrial ones must be considered to optimize performance. Network architectures and traffic demand are different for the satellite component and for the terrestrial 5G/6G one, so that the requirements of spectral resources for satellite and terrestrial systems are expected to vary dynamically in a significant range.

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

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：