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Tailored quinones support high-turnover Pd catalysts for oxidative C–H arylation with O2 期刊论文
Science, 2020
作者:  Chase A. Salazar;  Kaylin N. Flesch;  Brandon E. Haines;  Philip S. Zhou;  Djamaladdin G. Musaev;  Shannon S. Stahl
收藏  |  浏览/下载:8/0  |  提交时间:2020/12/22
Covalent surface modifications and superconductivity of two-dimensional metal carbide MXenes 期刊论文
Science, 2020
作者:  Vladislav Kamysbayev;  Alexander S. Filatov;  Huicheng Hu;  Xue Rui;  Francisco Lagunas;  Di Wang;  Robert F. Klie;  Dmitri V. Talapin
收藏  |  浏览/下载:9/0  |  提交时间:2020/08/25
Direct reversible decarboxylation from stable organic acids in dimethylformamide solution 期刊论文
Science, 2020
作者:  Duanyang Kong;  Patrick J. Moon;  Erica K. J. Lui;  Odey Bsharat;  Rylan J. Lundgren
收藏  |  浏览/下载:1/0  |  提交时间:2020/08/09
Ice retreat in Wilkes Basin of East Antarctica during a warm interglacial 期刊论文
NATURE, 2020, 583 (7817) : 554-+
作者:  T. Blackburn;  G. H. Edwards;  S. Tulaczyk;  M. Scudder;  G. Piccione;  B. Hallet;  N. McLean;  J. C. Zachos;  B. Cheney;  J. T. Babbe
收藏  |  浏览/下载:21/0  |  提交时间:2020/08/09

Uranium isotopes in subglacial precipitates from the Wilkes Basin of the East Antarctic Ice Sheet reveal ice retreat during a warm Pleistocene interglacial period about 400,000 years ago.


Efforts to improve sea level forecasting on a warming planet have focused on determining the temperature, sea level and extent of polar ice sheets during Earth'  s past interglacial warm periods(1-3). About 400,000 years ago, during the interglacial period known as Marine Isotopic Stage 11 (MIS11), the global temperature was 1 to 2 degrees Celsius greater(2)and sea level was 6 to 13 metres higher(1,3). Sea level estimates in excess of about 10 metres, however, have been discounted because these require a contribution from the East Antarctic Ice Sheet(3), which has been argued to have remained stable for millions of years before and includes MIS11(4,5). Here we show how the evolution of(234)U enrichment within the subglacial waters of East Antarctica recorded the ice sheet'  s response to MIS11 warming. Within the Wilkes Basin, subglacial chemical precipitates of opal and calcite record accumulation of(234)U (the product of rock-water contact within an isolated subglacial reservoir) up to 20 times higher than that found in marine waters. The timescales of(234)U enrichment place the inception of this reservoir at MIS11. Informed by the(234)U cycling observed in the Laurentide Ice Sheet, where(234)U accumulated during periods of ice stability(6)and was flushed to global oceans in response to deglaciation(7), we interpret our East Antarctic dataset to represent ice loss within the Wilkes Basin at MIS11. The(234)U accumulation within the Wilkes Basin is also observed in the McMurdo Dry Valleys brines(8-10), indicating(11)that the brine originated beneath the adjacent East Antarctic Ice Sheet. The marine origin of brine salts(10)and bacteria(12)implies that MIS11 ice loss was coupled with marine flooding. Collectively, these data indicate that during one of the warmest Pleistocene interglacials, the ice sheet margin at the Wilkes Basin retreated to near the precipitate location, about 700 kilometres inland from the current position of the ice margin, which-assuming current ice volumes-would have contributed about 3 to 4 metres(13)to global sea levels.


  
Day–night variation and size distribution of water-soluble inorganic ions in particulate matter in Ulsan, South Korea 期刊论文
Atmospheric Research, 2020
作者:  Tien Van Do, Quang Tran Vuong, Sung-Deuk Choi
收藏  |  浏览/下载:0/0  |  提交时间:2020/07/21
Understanding the Interfacial Behavior of Typical Perfluorocarboxylic Acids at Surfactant-Coated Aqueous Interfaces 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Cheng, Shumin;  Du, Lin;  George, Christian
收藏  |  浏览/下载:14/0  |  提交时间:2020/08/18
Langmuir film  Lipid  Mixed monolayer  Air-water interface  sea spray aerosol  Perfluorocarboxylic acids  
Stronger bonds bring bigger challenges 期刊论文
Science, 2020
作者:  Gabriela Oksdath-Mansilla
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/06
Dissociation of salts in water under pressure 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Zhang, Cunzhi;  Giberti, Federico;  Sevgen, Emre;  de Pablo, Juan J.;  Gygi, Francois;  Galli, Giulia
收藏  |  浏览/下载:4/0  |  提交时间:2020/06/22
Giant thermopower of ionic gelatin near room temperature 期刊论文
Science, 2020
作者:  Cheng-Gong Han;  Xin Qian;  Qikai Li;  Biao Deng;  Yongbin Zhu;  Zhijia Han;  Wenqing Zhang;  Weichao Wang;  Shien-Ping Feng;  Gang Chen;  Weishu Liu
收藏  |  浏览/下载:10/0  |  提交时间:2020/06/09
Mixing states of Amazon-basin aerosol particles transported over long distances using transmission electron microscopy 期刊论文
Atmospheric Chemistry and Physics, 2020
作者:  Kouji Adachi, Naga Oshima, Zhaoheng Gong, Suzane de Sá, Adam P. Bateman, Scot T. Martin, Joel F. de Brito, Paulo Artaxo, Glauber G. Cirino, Arthur J. Sedlacek III, and Peter R. Buseck
收藏  |  浏览/下载:14/0  |  提交时间:2020/06/09