《Nature》146年发展史,我们能学到什么?英国自然出版集团出版的综合性学术期刊《Nature》,在创刊历史、影响因子、载文量、期刊声誉等各个方面,都是国际顶级学术期刊中的执牛耳者。《Nature》也一直是我国学术期刊的榜样。
日前,复旦大学、西安交大、中国医学科学院等26家单位联合发布了中国人群泛基因组联盟一期研究进展,该成果发表在Nature主刊,这项研究初步构建了首个中国人群专属的泛基因组参考图谱,且该成果全部由中国科学家独立完成。
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Here we report ab initio-based calculations of compressed silica glasses, showing that the structural changes from low- to high-density amorphous structures occur through a sequence of percolation transitions. When the pressure is increased to 82 GPa, a series of long-range percolating clusters composed of corner- or edge-shared tetrahedra, pentahedra and eventually octahedra emerge at critical pressures and replace the previous ‘phase’ of lower-fold coordinated polyhedra and lower connectivity. This mechanism provides a natural explanation for the well-known mechanical anomaly around 3 GPa, as well as the structural irreversibility beyond 10 GPa, among other features. Some of the amorphous structures that have been discovered mimic those of coesite IV and V crystals reported recently, highlighting the major role of SiO5 pentahedron-based polyamorphs in the densification process of vitreous silica. Our results demonstrate that percolation theory provides a robust framework to understand the nature and pathway of amorphous–amorphous transformations and open a new avenue to predict unravelled amorphous solid states and related liquid phases.