检索结果-南通市图书馆

Comparison of organic pollutants in urban deposits of Guangzhou and Hong Kong metropolitan areas

Acta Geochimica 2006年第S1期 184-184页

作者： Nurdan S. Duzgoren-Aydin minggang you Adnan Aydin Department of Earth Sciences The University of Hong Kong Pokfulam Road Hong Kong SAR China State Key Laboratories of Organic Geochemistry Guangzhou Institute of Geochemistry Guangzhou 510640 China

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

Comparison of organic pollutants in urban deposits of Guangzhou and Hong Kong metropolitan areas

引用

Chinese Journal Of Geochemistry 2006年第B8期25卷 184-184页

作者： Zhiguang SONG Nurdan S. Duzgoren-Aydin minggang you Adnan Aydin State Key Laboratortes of Organic Geochemistry Guangzhou Institute of Geochemistry Guangzhou 510640 China Department of Earth Sciences. The University of Hong Kong Pokfulam Road Hong Kong SAR China

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

Lead isotope and trace metal characteristics of particulates accumulated on vehicular tunnel ceilings in Hong Kong and Guangzhou, SE China

引用

Chinese Journal Of Geochemistry 2006年第B08期25卷 75-75页

作者： Nurdan S. Duzgoren-Aydin Zhiguang SONG Adnan Aydin Coby C.S. Wong minggang you Xiangdong LI Department of Earth Sciences The University of Hong Kong Pokfulam Road Hong Kong SAR China State Key Laboratories of Organic Geochemistry Guangzhou Institute of Geochemistry Guangzhou 510640 China Department of Civil and Structural Engineering The Hong Kong Polytechnic University Hong Kong SAR China

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

Introduction and Influence of Water in the Preparation of Crosslinked PVC Foam by Isocyanate

引用

Chemical Research in Chinese Universities 2023年第5期39卷 782-789页

作者： BI Xiang LI minggang LU Min you Jiangan XUE Jian YU Haihui JIANG Zhiwei TANG Tao College of Chemical Engineering Northeast Electric Power UniversityJilin 132011P.R.China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022P.R.China College of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026P.R.China

In the preparation process of crosslinked polyvinyl chloride(c-PVC)foam by isocyanate,the formulated mixture is generally required to be carried out under the condition of isolated water,so as to avoid the mixing difficulties caused by the reaction between the introduced water and *** this paper,NaHCO_(3) was added to the mixture to indirectly introduce water into the system,and the effects of NaHCO_(3) on the cell structure and curing time of c-PVC foam were *** results showed that NaHCO_(3) not only played a role of foaming agent,but also was a good nucleating agent for *** the same time,the introduction of NaHCO_(3) held back the exudation of modified diphenylmethane-4,4'-diisocyanate(MDI)on the cell *** effects of NaHCO_(3) on the cell structure and aggregation structure of c-PVC foam were studied by thermogravimetric analysis,infrared spectroscopy and scanning electron *** results showed that decomposition of NaHCO_(3) occurred during the molding stage,which made small amount of MDI react with water to form polyurea,improved the compatibility of MDI with PVC and inhibited the exudation of MDI.

关键词： Crosslinked PVC foam Isocyanate Water Curing Sodium bicarbonate

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

Clifford algebra approach to pointwise convergence of Fourier series on spheres Dedicated to Professor Sheng GONG on the occasion of his 75th birthday

引用

Science China Mathematics 2006年第11期49卷 1553-1575页

作者： FEI minggang QIAN Tao Faculty of Science and Technology University of Macao P.O. Box 3001 Macao China Faculty of Science and Technology University of Macao P.O. Box 3001 Macao China

We offer an approach by means of Clifford algebra to convergence of Fourier series on unit spheres of even-dimensional Euclidean spaces. It is based on generalizations of Fueter's Theorem inducing quaternionic regular functions from holomorphic functions in the complex ***, especially, do not rely on the heavy use of special functions. Analogous Riemann-Lebesgue theorem, localization principle and a Dini's type pointwise convergence theorem are proved.

关键词： Clifford algebra, pointwise convergence of Fouirer series, unit sphere, Fueter's Theorem.

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

Autonomous process collaboration framework for C4ISR system interoperation

引用

Journal of Systems Engineering and Electronics 2017年第6期28卷 1098-1113页

作者： Lin Yang minggang Yu Qingchao Dong Control Engineering Department Naval Aeronautical and Astronautical University Institute of Command Information System PLA University of Science and Technology

Interoperability plays an important role in the joint command, control, communication, computer, intelligence, surveillance, reconnaissance(C4 ISR) operations. Coordinating and integrating operational processes to fulfill a common mission are challenged by the ever-changing battlefield and hence requires a cross-organizational process management that produces an autonomous, flexible and adaptable architecture for collaborative process evolution. The traditional business process collaboration pattern is based on the predefined "public-view" perspective and cannot meet the requirement of the joint task operations. This paper proposes a flexible visibility control mechanism and a dynamic collaboration framework for modeling and generating collaborative processes. The mechanism allows collaborators to define a set of visibility rules to generate different views of the private processes for different collaborations, which gives a great flexibility for the collaboration initiator to decide on an appropriate collaboration pattern. The framework supports collaborators to dynamically and recursively add a new process or even a new organization to an existing collaboration. Moreover, a formal representation of the processes and a set of generation algorithms are provided to consolidate the proposed theory.

关键词： cross-organizational collaboration interoperability collaborative process joint operations

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

A necessary and sufficient stability criterion for networked predictive control systems.

引用

Science China(Technological Sciences) 2016年第1期59卷 2-8页

作者： SUN Jian CHEN Jie GAN minggang School of Automation Beijing Institute of TechnologyBeijing 100081China Key Laboratory ofIntelligent Control and Decision of Complex System Beijing Institute of TechnologyBeijing 100081China

Stability of a networked predictive control system subject to network-induced delay and data dropout is investigated in this study. By modeling the closed-loop system as a switched system with an upper-triangular structure, a necessary and sufficient stability criterion is developed. From the criterion, it also can be seen that separation principle holds for networked predictive control systems. A numerical example is provided to confirm the validity and effectiveness of the obtained results.

关键词： networked control system networked predictive control stability network-induced delay data dropout

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

Data-driven optimal switching and control of switched systems

引用

Control Theory and Technology 2021年第3期19卷 299-314页

作者： Chi Zhang minggang Gan Chenchen Xue School of Automation Beijing Institute of TechnologyBeijing100081China Beijing Institute of Control Engineering BeijingChina China Academy of Launch Vehicle Technology BeijingChina

In this paper,optimal switching and control approaches are investigated for switched systems with infinite-horizon cost functions and unknown continuous-time *** first,for switched systems with autonomous subsystems,the optimal solution based on the finite-horizon HJB equation is proposed and a data-driven optimal switching algorithm is ***,for the switched systems with subsystem inputs,a data-driven optimal control approach based on the finite-horizon HJB equation is *** data-driven approaches approximate the optimal solutions online by means of the system state data instead of the subsystem ***,the convergence of the two approaches is ***,the validity of the two approaches is demonstrated by simulation examples.

关键词： Switched systems Optimal switching Optimal control Data-driven control

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

Physical layer security via maximal ratio combining and relay selection over Rayleigh fading channels

引用

Science China(Information Sciences) 2016年第6期59卷 167-176页

作者： Bin ZHONG minggang WU Tong LI Zhongshan ZHANG School of Information and Electrical Engineering Hunan University of Science and Technology Beijing Engineering and Technology Center for Convergence Networks and Ubiquitous Services University of Science and Technology Beijing

In this paper, the impact of both maximal ratio combining(MRC) and relay selection on the physical layer security in wireless communication systems is investigated by analyzing critical issues such as the probability characteristics of the legitimate receiver(Bob) and malicious eavesdropper(Eve)’s end-to-end signal-to-noise ratio(SNR), the secrecy outage probability and the average secrecy channel capacity over Rayleigh fading Channel, etc. Unlike the conventional physical layer security schemes, we assume that Bob receives its data from both the relay and the source via cooperative relay, provided that MRC is employed at the ***, compared to the conventional MRC methods, the proposed method is capable of achieving a higher spatial diversity order by performing relay selection, as validated by performing the theoretical analysis as well as numerical simulation. Furthermore, the closed-form expressions in terms of secrecy outage probability and average secrecy capacity are all consistent with the numerical results. Finally, the proposed scheme may be substantially affected by a number of parameters such as the number of relays, the SNR of links and the ratio of main-to-eavesdropper ratio(MER) λME.

关键词： average secrecy capacity cooperative communication maximal ratio combining outage probability physical layer security

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

Multi-dimensional blind separation method for STBC systems

引用

Journal of Systems Engineering and Electronics 2013年第6期24卷 912-918页

作者： minggang Luo Liping Li Guobing Qian Huaguo Zhang Department of Information Engineering University of Electronic Science and Technology of China

Intercepted signal blind separation is a research topic with high importance for both military and civilian communication systems. A blind separation method for space-time block code （STBC） systems is proposed by using the ordinary independent component analysis （ICA）. This method cannot work when specific complex modulations are employed since the assumption of mutual independence cannot be satisfied. The analysis shows that source signals, which are group-wise independent and use multi-dimensional ICA （MICA） instead of ordinary ICA, can be applied in this case. Utilizing the block-diagonal structure of the cumulant matrices, the JADE algorithm is generalized to the multidimensional case to separate the received data into mutually independent groups. Compared with ordinary ICA algorithms, the proposed method does not introduce additional ambiguities. Simulations show that the proposed method overcomes the drawback and achieves a better performance without utilizing coding information than channel estimation based algorithms.

关键词： multiple input multiple output (MIMO) space-time block code (STBC) multi-dimensional independent component analysis (MICA) blind separation

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：