长孙操 一代贤臣扩修广济渠 长孙无忌 一代贤相撰有《唐律疏议》 长孙皇后 一代贤后编写《女则》10卷 长孙姓氏之解说     

孙阳 《中国地名》2015,(2):40

一、姓氏源流长孙(Zhǎng sūn)姓源出有二:1、出自北魏皇室沙莫雄,为拓跋氏所改。长孙复姓本为拓跋氏,为后魏献文帝第三兄拓跋嵩之后。北魏道武帝拓跋的曾祖父拓跋郁律有两个儿子:大儿子沙英雄为南部大人,号拓跋氏;小儿子什翼健就是拓跋的祖父,拓跋建立北魏称帝后,因沙英雄是曾祖父的儿子,就赐他的儿子为长孙氏。长孙嵩后来位至太尉,封为北平王;他的侄子长孙道生屡建战功,位至宰  相似文献   

http://www.sciencedirect.com/science/article/pii/S167498711200148X     

Taku Tsuchiya  Kenji Kawai  Shigenori Maruyama 《地学前缘(英文版)》2013,4(3):341-347

The Earth was born from a giant impact at 4.56 Ga. It is generally thought that the Earth subsequently cooled, and hence shrunk, over geologic time. However, if the Earth's convection was double-layered, there must have been a peak of expansion during uni-directional cooling. We computed the expansion-contraction effect using first principles mineral physics data. The result shows a radius about 120 km larger than that of the present Earth immediately after the consolidation of the magma-ocean on the surface, and subsequent shrinkage of about 110 km in radius within about 10 m.y., followed by gradual expansion of 11 km in radius due to radiogenic heating in the lower mantle in spite of cooling in the upper mantle in the Archean. This was due to double-layered convection in the Archean with final collapse of overturn with contraction of about 8 km in radius, presumably by the end of the Archean. Since then, the Earth has gradually cooled down to reduce its radius by around 12 km. Geologic evidence supports the late Archean mantle overturn ca. 2.6 Ga, such as the global distribution of super-liquidus flood basalts on nearly all cratonic fragments (>35 examples). If our inference is correct, the surface environment of the Earth must have undergone extensive volcanism and emergence of local landmasses, because of the thin ocean cover (3–5 km thickness). Global unconformity appeared in cratonic fragments with stromatolite back to 2.9 Ga with a peak at 2.6 Ga. The global magmatism brought extensive crustal melting to yield explosive felsic volcanism to transport volcanic ash into the stratosphere during the catastrophic mantle overturn. This event seems to be recorded by sulfur mass-independent fractionation (SMIF) at 2.6 Ga. During the mantle overturn, a number of mantle plumes penetrated into the upper mantle and caused local upward doming of by ca. 2–3 km which raised local landmasses above sea-level. The consequent increase of atmospheric oxygen enabled life evolution from prokaryotes to eukaryotes by 2.1 Ga, or even earlier in the Earth history.  相似文献   

声学地层剖面探测技术在金州湾人工岛场址勘察中的应用     

王方旗  吴永亭  刘乐军  胡光海  董立峰  陶常飞 《工程地质学报》2012,20(5):841-848

声学地层剖面探测是一种基于声学原理的连续走航式探测水下地层结构和构造的地球物理方法,由于其灵敏度和分辨率高、连续性好且能高效地探测水下地层的地质特征及其分布而在海洋工程勘察中得到了广泛应用.拟在渤海金州湾海域内建造一座人工岛,场址沉积的地层是自晚更新世以来伴随着海平面升降和海侵海退过程而逐渐形成的,自上而下依次为:浅海...  相似文献   

Did natural fission of 235U in the earth lead to formation of the supercontinent Columbia?     

John J.W.Rogers 《地学前缘(英文版)》2012,3(4):369-374

Steady decline in the percentage of 235U in terrestrial uranium made natural fission impossible after about 1.8 Ga.Fission before 1.8 Ga disturbed the lead isotope system at various places worldwide,su...  相似文献   

白垩纪的吞龙巨鳄:恐鳄     

江泓 《海洋世界》2021,(1):74-77

故事傍晚时分,斜阳的光芒越过树梢洒在池塘上。一大群副栉龙正在池塘边饮水,现在是距今7600万年前的白垩纪时期,这片池塘位于今天美国的蒙大拿州。副栉龙们都是吵闹的大家伙,它们能够通过脑袋后面长长的骨管发出响亮的声音,所以在很远的地方就能够听到它们的叫声。副栉龙属于鸭嘴龙类,是典型的植食性恐龙,它们不仅吃树叶,还会吃水中的水草和藻类植物。  相似文献   

大连复州湾底质沉积物粒度特征与沉积环境分析     

李琰  胡克  王萍  王雪木  易亮  董永适 《海洋学研究》2013,31(3):41-48

对辽东半岛西部复州湾海域底质沉积物样品进行粒度分析结果表明,其粒度特征有较大差异:样品平均粒径值为1.2~6.5Φ;分选系数为1.4~2.6,分选为较差—差;偏度特征表现为极正偏和极负偏并存。粒度的空间分布存在一定分异规律,由湾内至湾外粒径表现出粗—细—粗的变化特征。粒度变化是对该区域物质输运和地形变化的响应,借助Weibull分布,推断河流携带物质可以被推送至5 m等深线外堆积,5~10 m等深线间沉积物表现为细粒的浅海台地沉积,10 m等深线以外沉积物受河流的影响微弱。矿物学证据也表明,河流输运对湾内沉积物贡献有限,仅限于5 m 等深线以内的水下三角洲,湾内沉积物主要来自于辽东湾沿岸冲刷和湾内基岩的剥蚀。  相似文献   

黄南州连续10年保持耕地总量动态平衡     

《青海国土经略》2013,(4):73

近年来,黄南州针对人多地少、用地量大的实际,采取有效措施,连续10年保持耕地总量动态平衡,实现了"保增长、保红线"双赢并进。超额完成耕地保有量2.008万公顷的目标,基本农田保护面积完成量为1.66万公顷,保护率达到100%以上。一是认真落实耕地保护目标责任制,制定出台了《黄南州耕地保护目标责任考  相似文献   

州县传真     

本刊编辑部 《青海国土经略》2013,(3):63-64

地方国土资源管理部门采取多种形式加强廉政建设为筑牢拒腐防变思想防线,努力打造"廉政国土、和谐国土"新形象,海北州国土资源局采取"面对面、一对一"和集中谈话的方式,紧抓倾向性和苗头性问题对干部进行约谈、提醒。黄南州国土资源局围绕"认清反腐倡廉形势、筑牢拒腐防变防线",从提高认识、认清形势、分析原因、筑牢防线四个方面进行深刻剖析。  相似文献   

刘山青厅长赴海北海南果洛州地勘项目一线调研     

《青海国土经略》2013,(4):68

7月22日至25日,刘山青厅长一行到海北、海南、果洛州地勘项目一线调研,慰问一线职工并征询开展群众路线教育实践活动意见建议。期间走访了鄂拉山银多金属矿、肯德弄舍金多金属矿和祁连地区铁矿勘查等项目基地,实地查看了  相似文献   

Acknowledgement to Reviewers     

《山地科学学报》2013,(6):1137-1153

Abeliotis, Konstadinos Department of Home Economics and Ecology, Harokopio University, Greece Abella, Scott R. Department of Environmental and Occupational Health, University of Nevada Las Vegas, USA Aceves-Quesada, Jos6 Fernando Instituto de Geografia UNAM, Mexico Acreman, Mike Centre for Ecology and Hydrology, Wallingford, Oxfordshire, UK Adhikari, Yagya Geobotany, Ecology and ecosystem management （Technische Universitat M0nchen）, Germany Ahmad, Shahbaz Indian Institute of Forest Management, India Ahmed, Sohel J. Urban and Rural Planning Discipline, Khulna University, Bangladesh  相似文献