搜索结果: 1-15 共查到“国际动态 理学 1.50”相关记录40条 . 查询时间(0.049 秒)
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新机器学习算法确认50颗系外行星
新机器 学习算法 50颗 系外行星
2020/8/27
据物理学家组织网2020年8月25日报道,英国科学家开发出一种新的机器学习算法,已用其确认了50颗系外行星。这是天文学家首次使用机器学习技术分析潜在行星样本,并确定哪些是真实的,哪些是“假”或假阳性,从而计算出每颗候选行星为一颗真正行星的概率。最新研究结果发表于《皇家天文学会月刊》上,该研究还首次对此类行星验证技术进行了大规模比较。研究人员表示,他们的结论为未来使用多种验证技术(包括他们的机器学习...
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One-third of plant and animal species could be gone in 50 years(图)
One-third plant animal species gone 50 years
2020/2/20
Accurately predicting biodiversity loss from climate change requires a detailed understanding of what aspects cause extinctions, and what mechanisms may allow species to survive.
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【前沿论坛】Dan McKenzie: 板块构造50年(图)
Dan McKenzie 板块构造 50年
2019/12/27
20世纪60年代,板块构造理论的诞生标志着人类在对地球运作方式的认识上有了革命性的进步,五十年来该理论始终是固体地球科学研究领域中的基本理论框架。McKenzie教授为我们简要回顾了板块构造理论创立之前地球科学的发展状况,分析了板块构造没有在之前诞生的原因,并从理论创立者的角度讲述了板块构造理论逐步建立的过程,阐释了观测和相关研究在其中起到的关键性作用。
50年前“旧模型”准确预测全球变暖
50年 “旧模型” 全球变暖
2019/12/23
气候变化怀疑者喜欢拿气候模型说事儿。他们声称,几十年前进行的计算机模拟并不能准确预测当前的气候变暖,因此,公众应该警惕新模型的预测能力。
近日,研究人员在《地球物理研究快报》上发表报告称,他们针对这些大约半世纪前的“老模型”进行了最全面的评估,结果表明,大多数气候模型的预测是准确的。
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New study finds U.S. and Canada have lost more than 1 in 4 birds in past 50 years(图)
U.S. Canada lost birds past 50 years
2019/10/18
Since 1970, bird populations in the U.S. and Canada have declined by 29%, or almost 3 billion birds, signaling a widespread ecological crisis, a study published in the journal Science reveals. The res...
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Tectonic collision 50 million years ago led to widespread ocean changes(图)
Tectonic collision 50 million years ago widespread ocean changes
2019/11/22
When the landmass that today is the Indian subcontinent slammed into Asia some 50 million years ago, the collision changed the configuration of the continents and altered global climate.Now a team of ...
美国研发出超过50比特的量子模拟器
美国 50比特 量子模拟器
2018/1/18
美国国家标准与技术研究院(NIST)发布消息称,该研究院与马里兰大学联合成立的联合量子研究所(JQI)科研人员利用离子阱制成53个量子比特的模拟器,用来研究量子磁体的相变。这一成果刊登在最新一期的《自然》杂志上。这一项目的团队利用53个独立的带有电荷的镱金属离子形成模拟系统,这些离子被电极限制在近似真空的电磁场中。通过利用激光操纵这些离子,可以模拟传统计算机所无法计算的复杂量子多体问题。此前,少量...
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A Fresh Look At Fresh Water:Researchers Create A 50,000-Lake Database(图)
Fresh Look At Fresh Water Researchers 50,000-Lake Database
2017/10/26
Countless numbers of vacationers spent this summer enjoying lakes for swimming, fishing and boating. But are they loving these lakes to death?The water quality of the nation's lakes is threatened not ...
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In a step toward bridging the gap between fungal taxonomy and molecular ecology, scientists from several institutions including Los Alamos National Laboratory have characterized a sample of “mystery” ...
Durable proteins make life possible in the crushing depths of the ocean, and may have evolved in life below the surface of ice-bound oceanic exo-planets. These proteins stay folded – allowing them to ...
未来25年至50年大多数灵长类物种或消失
灵长类物种 消失
2017/2/15
这个世界的大多数灵长类动物正处于深度困扰中。目前,中国仅剩下20到30只海南长臂猿,现在爪哇懒猴也濒临灭绝。即便是马达加斯加标志性的节尾狐猴也仅剩下2000只左右。它们可能是即将从地球上消失的下一批灵长类动物。但整体而言,前景甚至更加荒凉。根据预测,全球60%的灵长类动物可能会在未来25年到50年消失。
Well-preserved fossils show ostrich relatives lived in North America 50 million years ago
fossils ostrich relatives North America 50 million years ago
2016/7/15
Exceedingly well-preserved bird fossil specimens dating 50 million years represent a new species that is a previously unknown relative of the modern-day ostrich, according to a new paper co-authored b...
Ocean temperatures predict U.S. heat waves 50 days out
Ocean temperatures U.S. heat waves 50 days out
2016/4/13
This is part 14 in a series on NSF's geosciences risk and resilience interest area. Please see parts one,two, three,four, five, six, seven, eight, nine, 10,...
Ocean temps predict US heat waves 50 days out, study finds
Ocean temps US heat waves 50 days out
2016/4/13
The formation of a distinct pattern of sea surface temperatures in the middle of the North Pacific Ocean can predict an increased chance of summertime heat waves in the eastern half of the United Stat...