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    • 严丁
    • 摘要: 世界大学与学科排名作为第三方评价,是我国大学评价、学科评估的重要参考指标之一。文章采用THE世界大学排名和学科排名,通过世界大学综合榜单以及学科榜单的表现情况,从地区分布特征、学科分布特征、学校类型分布特征、排名5年变化等角度,透视我国非“双一流”建设大学与学科排名的表现和特征。研究发现“非双”大学各省发展实力不均,学科发展差异较大,优势与弱势明显,并提出建议与对策,以我国“双一流”建设新一轮遴选和第五轮学科评估工作为契机,助推我国高校与学科高质量发展。
    • Joice Dias de Moraes; Pedro Cordeiro; Eduardo Abrahão Filho; Juliana Rezende Oliveira; Carlos Victor Rios da Silva Filho
    • 摘要: Iron formations are valuable archives of sedimentary conditions and post-depositional events.However,geochemical proxies commonly used to determine genetic characteristics can be variably modified during metamorphism and deformation,hampering their use as records of regional geological events.This work focuses on strongly reworked magnetite-quartz-rich rocks from the São Josédo Campestre Massif,one of the oldest fragments of preserved crust in South America.The genetic classification of these magnetite-quartz-rich rocks is not straightforward because primary assemblages and textures were variably modified by granulite facies metamorphism during a regional Paleoproterozoic migmatization event.To address genetic ambiguities,we analyzed their magnetite and pyroxene chemistry,wholerock geochemistry,and Sm-Nd isotopes.Magnetite chemistry indicates that pyroxene-poor iron formations(Type B)are low in trace elements such as Ti,Al,V,and Mn,suggesting a chemical similarity to iron formations elsewhere.In contrast,magnetites from pyroxene-enriched Type A iron formations are rich in trace elements and more akin to magnetite crystallized from higher temperature systems,such as skarn and IOCG.The^(147)Sm/^(144)Nd of these rocks show substantial variation even at the outcrop scale,indicating a locally-controlled,highly heterogeneous mixture of Archean,Paleoproterozoic,and Neoproterozoic sources.Therefore,our geochemical tools point out to heterogenous signatures of these magnetitequartz rocks and proxies compatible with both low and high-temperature conditions and age of deposition spanning sources from the Archean to the Neoproterozoic.We interpret that the studied São Josédo Campestre magnetite-quartz rocks represent Archean iron formations with original magnetite chemistry and isotopic signatures variably modified by metamorphism and by at least one deformation-related hydrothermal event.These results contrast with similar examples from China and Greenland where iron formations either preserved the magnetite chemistry or the primary isotopic signatures.Our study indicates that metamorphism can selectively affect chemical proxies used to study iron formations and undermine the genetic classification of iron ores.Thus,these proxies should be carefully applied in the interpretation of syn-depositional environments of polydeformed belts.
    • Na ZHAO
    • 摘要: The"corridor"constructed jointly by multi-nationalities provides a space of cultural dissemination for the Legend of King Yu Tamed the Flood the in Hexi Corridor.Legend of King Yu Tamed the Flood spreads on the flowing cultural"corridor",relying on various narrative forms of cultural media.It deeply promotes the localization of the Legend of King Yu Tamed the Flood.The situation of integration and harmony between ethnic groups and Common value orientation of multi-ethnic humanities and religions are explored and taken through the multicultural elements embedded in the legend so that the"cultural integration"hidden in the legends and stories can emerge.
    • Irina; 刘闻(摄影)
    • 摘要: 12周年前这个特殊的日子,我们邀请THE 9-孔雪儿一同开启一场探索年轻时髦新态度的旅程,在短暂的接触中不难感受到她身上传递出的直率又纯粹的力量。她是典型的金牛座,慢热却温暖,理智真诚也热情多变。舞台上的她是为舞而生的精灵,私下的她却更像是邻家女孩,越是了解越觉得她的内心有一个奇幻且辽阔的世界,能容纳下她所有的小情绪,也承载得了她的梦想,就是这样一个女孩每一天都在蜕变,每次相见都更让人期待!
    • 摘要: the voice是德国著名音响品牌EINSTEIN(爱因斯坦)去年推出的一款落地式音箱。这款the voice采用了EINSTEIN—贯的密闭式及箱体后倾设计,这是为了获得更快的低频速度与瞬态反应,以及更佳的全频相位_致性。
    • Tom; 余绍叙(画稿)
    • 摘要: 小朋友们,你们知道吗?英语当中有很多习语,它们真正的含义可能和字面意思不同哦。读一读下面这个小故事,一起来学习一下"the dog in the mange"的意思吧。
    • Samantha
    • 摘要: 小朋友们,你们知道吗?在学习英语的过程中,有的单词与词组是不能直接从字面上去理解的哦,我们需要运动脑筋,还要查阅相关背景资料才能明白它们的含义。是不是很趣呢?在“Do You Know the Slang?”栏目中,QQ姐姐会带你们一起去探索这些单词与词组背后的奥秘,一起来看看吧!
    • 摘要: Hit the Road上路;启程,出发"thit the road"可不是“击打路面”峨。据说,这个表达起源于“马蹄飯击道路”,其实人走路,也是用脚敲打路面,是不是很形象呢?这个表达后来引申为“启程上路”之意。
    • 陶冶情
    • 摘要: “the+比较级,the+比较级”通常表示相比较的两种事物在某种程度上的增加或减少的比例关系。在这种结构中,一般从句在前,主句在后。
    • 章健科
    • 摘要: 在美国俄勒冈州火山口湖的蓝色湖水中,一棵被称为"湖中老人"(Old Man of the Lake)的悬浮残树已漂流了至少120年之久……
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