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03-23-2012 13:50 BJT

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* 破解数学难题“西塔潘猜想”22岁大学生提名世界华人“希望之星”奖

国际数学界过去20多年无法破解的难题,却让刘嘉忆在两个月时间内找出了答案。这名22岁大学生也凭着这一成就,获得了这一届“影响世界华人大奖‘希望之星’”的奖项提名。两年前,就读于湖南省长沙市中南大学的刘嘉忆接触了英国数理逻辑学家西塔潘(David Seetapun)在1990年提出的反推数学猜想——“西塔潘猜想”。刘嘉忆对此颇感兴趣,也阅读了大量相关书籍。两个月后他灵机一动,便连夜撰写证明过程,让这猜想终于得到了破解。他坦言自己一开始并不是为了破解“西塔潘猜想”而进行研究的,他是在思考其他问题时突然发现能使用同样的办法解开该猜想。刘嘉忆也将这解答文章投给了数理逻辑刊物《符号逻辑杂志》,并得到该杂志主编的赞赏。他在隔年也成为首名参与芝加哥数理逻辑学术会议的亚洲高校代表,同与会者分享研究成果。对于自己获得提名,刘嘉忆感到既自豪又惭愧。他说,能够获得“影响世界华人盛典”大奖并且能和各领域的佼佼者站在一起也是一件极为骄傲的事情。

* 国际空间站将首次迎来私企飞船

美国太空探索技术公司表示,该企业将在4月30号向国际空间站发射一艘名为“龙”的货运飞船。如果一切顺利,这将是国际空间站首次迎来私营企业建造的太空飞船。太空探索技术公司说,这艘“龙”飞船将从美国佛罗里达(Florida)州卡纳维拉尔角(Cape Canaveral)升空,并在数天后抵达国际空间站。这次发射原定于今年2月进行,但由于需对该飞船进行更多测试,发射时间被推迟。预计,这将是航天飞机退役后美国首次向国际空间站运送货物。据美国航天局介绍,该局已经与太空探索技术公司签订合约,将利用这家公司制造的飞船为国际空间站进行12次货运补给。太空探索技术公司2010年成功将试验型“龙”飞船送入环绕地球运行的太空轨道,此后又操控它重返大气层。“龙”飞船由此成为首个完成这一任务的私营航天器。

*女摄影师意外拍摄罕见紫色北极光 景象炫目

英国业余摄影师安妮塔•尼克森不久前丢了工作,为了振奋自己,她选择去苏格兰(Scotland)群岛庆祝生日。她本来希望能拍下夕阳落山的美景,却意外遇见了北极光,没想到在这里拍摄到的还是极其罕见的紫色北极光,令人炫目。“这种颜色在英国极其罕见。这里是我旅行的最后一站,没想到能以这种奇妙的方式结尾。”尼克森说。北极光由带电太阳粒子和地球上层大气碰撞产生。尽管北极光会持续不断地闪耀,但是在地球上只有夜里才能观测到北极光。

- 本节目由 CNTV English 中国网络电视台英语台 和 iMandarinPod 爱汉语播客 联合制作

Editor:Zhang Hao |Source: CNTV.CN

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