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3D sedimentary architecture showing the inception of an Ice Age 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Loseth, H.;  Dowdeswell, J. A.;  Batchelor, C. L.;  Ottesen, D.
收藏  |  浏览/下载:5/0  |  提交时间:2020/06/16
Changes in Deep-Sea Oxygenation in the Northeast Pacific Ocean During 32-10 ka 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (11)
作者:  Saravanan, Ponnusamy;  Gupta, Anil K.;  Zheng, Hongbo;  Rai, Santosh K.;  Panigrahi, Mruganka K.
收藏  |  浏览/下载:9/0  |  提交时间:2020/05/25
Cascadia margin  upwelling  Bolling-angstrom llerod  oxygen minimum zone  intermediate water  
Extinction of eastern Sahul megafauna coincides with sustained environmental deterioration 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Hocknull, Scott A.;  Lewis, Richard;  Arnold, Lee J.;  Pietsch, Tim;  Joannes-Boyau, Renaud;  Price, Gilbert J.;  Moss, Patrick;  Wood, Rachel;  Dosseto, Anthony;  Louys, Julien;  Olley, Jon;  Lawrence, Rochelle A.
收藏  |  浏览/下载:16/0  |  提交时间:2020/05/20
Dissolved Thorium Isotope Evidence for Export Productivity in the Subtropical North Pacific During the Late Quaternary 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (11)
作者:  Liu, Ruolin;  Wang, Maoyu;  Li, Weiqiang;  Shi, Xuefa;  Chen, Tianyu
收藏  |  浏览/下载:8/0  |  提交时间:2020/05/13
Transient stripping of subducting slabs controls periodic forearc uplift 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Menant, Armel;  Angiboust, Samuel;  Gerya, Taras;  Lacassin, Robin;  Simoes, Martine;  Grandin, Raphael
收藏  |  浏览/下载:6/0  |  提交时间:2020/05/13
Short-range order and its impact on the CrCoNi medium-entropy alloy 期刊论文
NATURE, 2020, 581 (7808) : 283-+
作者:  Tan, Hwei-Ee;  Sisti, Alexander C.;  Jin, Hao;  Vignovich, Martin;  Villavicencio, Miguel;  Tsang, Katherine S.;  Goffer, Yossef;  Zuker, Charles S.
收藏  |  浏览/下载:8/0  |  提交时间:2020/07/03

Traditional metallic alloys are mixtures of elements in which the atoms of minority species tend to be distributed randomly if they are below their solubility limit, or to form secondary phases if they are above it. The concept of multiple-principal-element alloys has recently expanded this view, as these materials are single-phase solid solutions of generally equiatomic mixtures of metallic elements. This group of materials has received much interest owing to their enhanced mechanical properties(1-5). They are usually called medium-entropy alloys in ternary systems and high-entropy alloys in quaternary or quinary systems, alluding to their high degree of configurational entropy. However, the question has remained as to how random these solid solutions actually are, with the influence of short-range order being suggested in computational simulations but not seen experimentally(6,7). Here we report the observation, using energy-filtered transmission electron microscopy, of structural features attributable to short-range order in the CrCoNi medium-entropy alloy. Increasing amounts of such order give rise to both higher stacking-fault energy and hardness. These findings suggest that the degree of local ordering at the nanometre scale can be tailored through thermomechanical processing, providing a new avenue for tuning the mechanical properties of medium- and high-entropy alloys.


Metal alloys consisting of three or more major elemental components show enhanced mechanical properties, which are now shown to be correlated with short-range order observed with electron microscopy.


  
Asian inland wildfires driven by glacial-interglacial climate change 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (10) : 5184-5189
作者:  Han, Yongming;  An, Zhisheng;  Marlon, Jennifer R.;  Bradley, Raymond S.;  Zhan, Changlin;  Arimoto, Richard;  Sun, Youbin;  Zhou, Weijian;  Wu, Feng;  Wang, Qiyuan;  Burr, George S.;  Cao, Junji
收藏  |  浏览/下载:9/0  |  提交时间:2020/05/13
biomass burning  Quaternary climate  carbon cycle  high-intensity fires  soluble iron  
Magnetostratigraphy and Palaeoclimatic Significance of the Late Pliocene Red Clay-Quaternary Loess Sequence in the Lanzhou Basin, Western Chinese Loess Plateau 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (3)
作者:  Guo, Benhong;  Peng, Tingjiang;  Yu, Hao;  Hui, Zhengchuang;  Ma, Zhenhua;  Li, Xiaomiao;  Feng, Zhantao;  Liu, Jia;  Liu, Shanpin;  Zhang, Jun;  Ye, Xiyan;  Song, Chunhui;  Li, Jijun
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/02
Pervasive Desiccation of North American Lakes During the Late Quaternary 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (3)
作者:  Liefert, David T.;  Shuman, Bryan N.
收藏  |  浏览/下载:5/0  |  提交时间:2020/07/02
Geographically divergent evolutionary and ecological legacies shape mammal biodiversity in the global tropics and subtropics 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (3) : 1559-1565
作者:  Rowan, John;  Beaudrot, Lydia;  Franklin, Janet;  Reed, Kaye E.;  Smail, Irene E.;  Zamora, Andrew;  Kamilar, Jason M.
收藏  |  浏览/下载:9/0  |  提交时间:2020/05/13
biogeography  functional ecology  human impacts  paleoclimate legacies  phylogenetic diversity