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多端柔性直流电网公共直流电压协同控制方法 被引量:6
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作者 马覃峰 邵震霞 +2 位作者 康鹏 王寅 焦鑫艳 《南方电网技术》 北大核心 2017年第5期24-28,62,共6页
与传统交流电网相比,柔性直流电网具有较强优势,在可再生能源等多能源接入应用中引起了高度重视。为避免多端柔性直流电网中各子系统争夺电压控制权问题,提出了一种多端柔性直流电网公共直流电压协同控制方法。该方法利用柔性直流电网... 与传统交流电网相比,柔性直流电网具有较强优势,在可再生能源等多能源接入应用中引起了高度重视。为避免多端柔性直流电网中各子系统争夺电压控制权问题,提出了一种多端柔性直流电网公共直流电压协同控制方法。该方法利用柔性直流电网公共直流电压作为公共信息源,根据负载单元、可再生能源单元、储能单元和辅助供电单元的不同工况,分别由可再生能源单元、储能单元以及辅助供电单元独立地将公共直流电压控制在规定范围之内,实现电网电压稳定。通过Saber软件进行的仿真表明,所提方法能够有效控制多端柔性直流电网公共直流电压,维护系统功率平衡。 展开更多
关键词 多端柔性直流电网 可再生能 储能 辅助供电 公共信息源
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动态性经济信息搜集途径刍议 被引量:2
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作者 刘龙英 《图书馆论坛》 CSSCI 北大核心 1999年第4期11-12,共2页
本文从经济信息的动态性角度出发,系统地阐述了经济信息搜集的各种途径。
关键词 经济信息 动态性 信息搜索 因特网 公共信息源
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Taking the "Local" out of Local News: Implications for an Informed Public
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作者 Lee Hood 《Journalism and Mass Communication》 2013年第9期549-562,共14页
The meaning of "local" in TV news is not as straightforward as one might imagine. "Local" newscasts in several U.S. markets are outsourced to an independent company located hundreds of miles from the communities s... The meaning of "local" in TV news is not as straightforward as one might imagine. "Local" newscasts in several U.S. markets are outsourced to an independent company located hundreds of miles from the communities served. What are the implications of such a delivery system for coverage of local issues and the Jeffersonian ideal of an informed citizenry? This study employs a content analysis of outsourced and local newscasts, using a data set of more than 1,000 stories from more than 30 hours of newscasts to determine if differences exist on story topics and source types. Does one type of station cover more public affairs stories than the other? Does one type use more official sources, or more perspective from private individuals? Even with the wide array of news sources currently available, local TV news still ranks as the most widely used information source. How well that source delivers information to local audiences is an important question to ask, particularly when the information may be coming from a great distance. 展开更多
关键词 TV news content analysis local news news outsourcing public affairs coverage
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On Modern Censorship in Public Service Broadcasting
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作者 Radomír Silber 《Cultural and Religious Studies》 2018年第3期162-191,共30页
The paper focuses on the manifestations, causes, and consequences of the failure of so-called public service media, especially in the field of news and journalism. Those media that, unlike private media, are funded fr... The paper focuses on the manifestations, causes, and consequences of the failure of so-called public service media, especially in the field of news and journalism. Those media that, unlike private media, are funded from public sources. The public service, which citizens are obliged to pay through taxes or direct fees, is supposed to provide quality information, to produce and to disseminate content that satisfies the democratic, cultural, and social needs of the society, with a task at hand to preserve media pluralism. The major obligation of public service media is usually for them to provide objective, validated, and balanced information for people, so they can choose freely where they stand on any given issue. However, examples of the failures of two public service media operating in the Central European Czech Republic, Czech Radio (?Ro), and Czech Television (?T), as well as the failures of the statutory control boards of these media, show that the required high quality public service prescribed by law, especially in the field of news and journalism and other programs, is not always kept. Public service media may be partisan and apply elements of modern censorship. This is a censorship that the law of the public service media does not impose and does not allow to carry out. Such censorship, which is a result of unilateral subordination of the influence of specific political parties, interest groups, and opinion streams, is reflected in information manipulation, purposeful agenda development, selection of information and information sources, spiral of silence, in the preference of some political parties, partisan, interest interpretation, and adaptation of reality in broadcasting. 展开更多
关键词 modern censorship OBJECTIVITY PARTISANSHIP public service media
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