搜索结果: 1-15 共查到“理学 Ross”相关记录29条 . 查询时间(0.139 秒)
在一天内完成所有我们想做的事情是很困难的。但如果我们生活在地球历史的早期，那就更加困难了。虽然我们理所当然地认为一天24小时，但在地球久远的过去，一天的时间更短。因为月球距地球更近，所以白天的长度更短。
Ross Mitchell等-NC：雪球地球时期生命存续之谜新解（图）
雪球地球 岩石 地层 生命存续
2021/7/22
雪球地球是地球经历过的最极端的气候事件。当今冰盖只出现在位于高纬度的大陆比如格陵兰岛和南极洲，与之相反，雪球地球顾名思义，意味着整个地球都被厚冰层包裹住了。加州理工学院的Joseph Kirschvink和哈佛大学的Paul Hoffman及其团队最初提出雪球地球假说时，他们描绘的极端气候事件引发了很大的争议。Gabrielle Walker撰写的一本引人入胜的书详细介绍了90年代末到2000年代...
Ross Mitchell等-NC：晚白垩世真极移振荡
Ross Mitchell 晚白垩世 真极 移振荡
2021/6/30
真极移（行星旋转轴的重新定向）在其他行星和卫星中都有很好的记录，在地球上通过人造卫星也能够得到观测。但由于板块构造引起的同时的运动，检测真极移在地球过去的普遍性变得复杂。学术界对晚白垩世约84 Ma的真极移是否存在尚有争议。 来自意大利 Scaglia Rossa灰岩的经典古地磁数据是反对存在84 Ma真极移的主要依据。近日，岩石圈演化国家重点实验的Ross Mitchell研究员与国际合作者发表...
Ross Mitchell等-NREE：超大陆旋回（图）
Ross Mitchel NREE 超大陆 旋回
2021/4/25
超大陆是板块构造自我组构的表达。在过去的约20亿年，研究者主要识别出了三个超大陆，即潘吉亚、罗迪尼亚和哥伦比亚。太古宙超级克拉通（不同于超大陆，尺度相对较小）在构造上似乎是不同的，但大陆周期性的聚合和裂解型式可能延续到约30亿年前。近日，岩石圈演化国家重点实验的Ross Mitchell研究员与国际合作者在NREE发表超大陆旋回的综述文章，讨论了超大陆的出现如何为现代全球板块构造的开启提供最小年龄...
Banks of Antarctica's Ross Sea offer rich food source for emperor penguins（图）
Banks Antarctica Ross Sea rich food source emperor penguins
2020/8/14
A new U.S. National Science Foundation-supported study provides some of the most comprehensive evidence to date of the lengths penguins will go for a meal. The results were reported in the journa...
Study in Antarctic waters reveals why Ross Ice Shelf melts in summer（图）
Antarctic waters reveals Ross Ice Shelf melts summer
2019/10/22
A new paper by NSF-funded researchers at the Earth Institute at Columbia University offers fresh insights into the forces causing the world's largest ice shelf to melt.The Ross Ice Shelf, a part of th...
Study uncovers surprising melting patterns beneath Antarctica's Ross Ice Shelf（图）
patterns Antarctica Ross Ice Shelf
2019/10/28
Scientists working on the ROSETTA-Ice project, a three-year, multi-institution survey of the Ross Ice Shelf in Antarctica, have assembled an unprecedented view of the seafloor beneath the ice sheet.In...
约束的Ross更加风险厌恶刻画下的预防性努力投资决策
预防性努力 自我保险 自我保护 自我保险兼保护 约束的Ross更加风险厌恶
2019/4/17
在对个体风险偏好的现有刻画下，一个更加风险厌恶的个体未必会投资更多的预防性努力活动.为了解决这种不一致性，本文基于二次函数约束的Ross更加风险厌恶的刻画，获得了与个体风险偏好相一致的比较静态结果：当额外的预防性努力活动降低了个体最终财富的均值且损失发生的初始概率小于1/2时，一个二次函数约束的Ross更加风险厌恶的个体总是投资更多的预防性努力活动.
Professor Ross J. Salawitch，Department of Chemistry & Biochemistry at University of Maryland（图）
Professor Ross J. Salawitch Department of Chemistry & Biochemistry at University of Maryland
2016/5/18
Ross J. Salawitch,Professor,Research Interests:Quantification of the effects of human activity on the composition of Earth’s atmosphere by the development of computer models used to analyze a wide var...
First stage of INTRAMAP: INtegrated Transantarctic Mountains and Ross Sea Area Magnetic Anomaly Project
magnetic anomalies Antartica magnetic map compilation potential field data
2015/10/8
INTRAMAP (INtegrated Transantarctic Mountains and Ross Sea Area Magnetic Anomaly Project) is an international effort to merge the magnetic data acquired throughout the "Ross Sea Antarctic Sector" (sou...
Multiplatform, Multidisciplinary Investigations of the Impacts of Modified Circumpolar Deep Water in the Ross Sea, Antarctica
Multiplatform Multidisciplinary Investigations
2015/7/17
In 2010–2011, three projects combined to characterize the temporal and spatial distributions of Modified Circumpolar Deep Water (MCDW) in the Ross Sea using icebreaker-based sampling, gliders, instrum...
glacial intensification during the Neogene a review of Seismic Stratigraphic evidence from the ross Sea, antarctica, continental Shelf
Seismic Stratigraphic evidence antarctica
2015/7/15
Seismic stratigraphic and drill data from Antarctic continental
margins have provided much direct evidence concerning ice sheet evolution as
Earth’s climate cooled from the warmth of the Eocene. S...
What Lies Beneath? Interdisciplinary Outcomes of the ANDRILL Coulman High Project Site Surveys on the Ross Ice Shelf
Ross Ice Shelf Coulman High
2015/7/15
Extensive field operations were conducted on the northwestern Ross Ice Shelf in Antarctica from November 2010 through January 2011. A significant amount of equipment, supplies, and people safely trave...
The Ross Sea in a Sea of Change
Ross Sea Sea
2015/7/15
The Ross Sea, the most productive region in the Antarctic, reaches farther south than any body of water in the world. While its food web is relatively intact, its oceanography, biogeochemistry, and se...
Double dating detrital zircons in till from the Ross Embayment, Antarctica
geochronology thermochronology Ross Embayment, Antarctica Antarctica
2015/1/16
U/Pb and (U-Th)/He (ZHe) dating of detrital zircons from glacial till samples in the Ross Embayment, Antarctica records cooling after the Ross/Pan-African orogeny (450-625 Ma) followed by a mid-Jurass...