检索结果-南通市图书馆

The Tianma 65 m radio telescope at Shanghai

Astronomical Techniques and Instruments 2024年第5期1卷 239-246页

作者： Qinghui Liu Zhiqiang Shen Xiaoyu Hong Qian Ye Bin Li Jinqing Wang Rongbing Zhao Li Fu Weiye Zhong Lingling Wang Juan Li Zhen Yan Wu Jiang Bo Xia Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China

The Shanghai Tianma 65 m radio telescope(TMRT)is a large,fully rotatable radio telescope with multiple scientific *** main body of the telescope and four low-frequency receiving systems,including L,C,and S/X bands,were completed between 2008 and *** 2013 to 2017,four high-frequency receiving systems,including Ku,K,Ka,and Q bands,were constructed and their performance was comprehensively *** are three main innovations.(1)A fully movable large radio telescope system with advanced performance and complete functions has been built.(2)An advanced,reliable main reflector adjustment system has been completed,overcoming gravity deformation and creating a large antenna with a main reflective surface accuracy of 0.28 mm(root mean square)for any elevation.(3)Five innovative technologies have been developed to achieve high-precision pointing in any direction within 3″.The TMRT has made a crucial contribution to the orbital measurement and positioning of China’s lunar and deep space *** enhancing China's ability to participate in international VLBI observations and radio astronomy,this has facilitated a series of achievements in observational radio astronomical research,in areas such as VLBI,spectral lines,and pulsars.

关键词： Radio telescope Tianma Large antenna receiving system Surface accuracy

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 Approach to the Ultimate Goal of Power Grid Development—Constant Voltage Operation

引用

CSEE Journal of Power and Energy systems 2017年第4期3卷 380-389页

作者： Zheng Xu Zhipeng Bian Binjie Cheng Department of Electrical Engineering Zhejiang UniversityHangzhou 310027China

The concept of constant voltage operation is proposed in this paper and it is demonstrated that the ultimate goal of power grid development is constant voltage *** topic is expanded into three aspects:the benefits of constant voltage operation,the technology and equipment to realize constant voltage operation,and the reactive power compensation capacity needed for constant voltage *** benefits of constant voltage operation have four aspects:1)Constant voltage operation is the ultimate presentation of the strong smart grid;2)Constant voltage operation can resist grid disturbances in the most powerful manner and greatly improve the power system stability;3)Constant voltage operation can effectively eliminate the voltage fluctuation problem involved with the integration of large scale renewable energy;4)Constant voltage operation can minimize the grid power *** means to realize constant voltage operation is primarily the modular multilevel converter based STATCOM(MMC-STATCOM),which has encountered great acceptance during recent *** verifications are run in a modified IEEE 300-bus system and the Pearl River Delta grid in PSS/*** results indicate that constant voltage operation can greatly improve the stability of power systems and the capacity of installed MMC-STATCOMs is within an acceptable range.

关键词： Constant voltage operation DC multi-infeed MMC-STATCOM reactive power balance receiving system renewable energy integration voltage fluctuation

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

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

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：