北京获“自然指数”全球城市科研产出冠军
<p>英国《自然》杂志19日刊登了“2017自然指数－科研城市”，北京在全球城市中夺得科研产出冠军，上海位列第五。</p><p><span word="Beijing">Beijing</span> <span word="tops">tops</span> <span word="the">the</span> <span word="list">list</span> <span word="of">of</span> <span word="cities">cities</span> <span word="for">for</span> <span word="research">research</span> <span word="output">output</span> <span word="while">while</span> <span word="Shanghai">Shanghai</span> <span word="ranks">ranks</span> <span word="the">the</span> <span word="fifth">fifth</span>, <span word="according">according</span> <span word="to">to</span> <span word="Nature">Nature</span> <span word="Index">Index</span> 2017 <span word="Science">Science</span> <span word="Cities">Cities</span> <span word="supplement">supplement</span> <span word="released">released</span> <span word="on">on</span> <span word="Thursday">Thursday</span>, <span word="reports">reports</span> <span word="Xinhua">Xinhua</span>.</p><p>新华社报道，10月19日发布的“2017自然指数－科研城市”中，北京高居榜首，上海位列第五。</p><p><span word="Nature">Nature</span> <span word="Index">Index</span> 2017 <span word="Science">Science</span> <span word="Cities">Cities</span> <span word="supplement">supplement</span> <span word="has">has</span> <span word="tracked">tracked</span> <span word="counts">counts</span> <span word="of">of</span> <span word="research">research</span> <span word="output">output</span> <span word="of">of</span> 500 <span word="cities">cities</span> <span word="worldwide">worldwide</span> <span word="in">in</span> <span word="the">the</span> <span word="last">last</span> <span word="year">year</span>.</p><p>“2017自然指数－科研城市”分析了全球500个城市过去一年的科研产出数据。</p><p>自然指数（<span word="Nature">Nature</span> <span word="Index">Index</span>）是依托于全球68本顶级期刊，统计各高校、科研院所（国家）在国际上最具影响力的研究型学术期刊上发表论文数量的数据库（<span word="a">a</span> <span word="database">database</span> <span word="of">of</span> <span word="author">author</span> <span word="affiliation">affiliation</span> <span word="information">information</span> <span word="collated">collated</span> <span word="from">from</span> <span word="research">research</span> <span word="articles">articles</span> <span word="in">in</span> <span word="the">the</span> <span word="most">most</span> <span word="influential">influential</span> <span word="journals">journals</span> <span word="around">around</span> <span word="the">the</span> <span word="world">world</span>）。</p><p>“2017自然指数－科研城市”分析了全球500个城市的科研产出（<span word="research">research</span> <span word="output">output</span>）数据，通过加权分数式计量（<span word="weighted">weighted</span> <span word="fractional">fractional</span> <span word="count">count</span>，<span word="WFC">WFC</span>），统计出了全球科研产出最高的十大城市，北京以1693的分值夺得冠军，随后是巴黎、纽约、剑桥（美国马萨诸塞州）、上海、东京、伦敦、波士顿、圣迭哥、剑桥（英国）。这十大城市贡献了全球科研产出的17%。</p>
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