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QUATERNARY: 作品数：601被引量：1081H指数：16; 导出分析报告; 相关领域：天文地球更多>>; 相关作者：黄河滕怀龙刘东生张世民杨景春更多>>; 相关机构：中国科学院武汉大学北京大学国家地震局更多>>; 相关期刊：更多>>; 相关基金：国家自然科学基金国家重点基础研究发展计划中国博士后科学基金福建省自然科学基金更多>>

Access to N-a-quaternary chiral morpholines via Cu-catalyzed asymmetric propargylic amination/desymmetrization strategy: 《Science Bulletin》2024年第22期3516-3524,共9页Peng Chen Mao-Mao Zhang Li Rao Yuan-Heng Li Yue Jia Ying Tan Wen-Jing Xiao Liang-Qiu Lu; supported by the National Key R&D Program of China(2023YFE0110100);the National Natural Science Foundation of China(22271113,92256301,21822103,and 21820102003)。; Morpholines are widespread in many biologically and catalytically active agents,thus being an important aim of pharmaceutical and synthetic chemists.However,efficient strategies for the catalytic asymmetric synthesis ...; 关键词：Chiral morpholine Copper catalysis DESYMMETRIZATION Propargylic amination

Synthesis and antibacterial characterization of waterborne polyurethanes with gemini quaternary ammonium salt被引量：15: 《Science Bulletin》2015年第12期1114-1121,I0003,共9页Yi Zhang Yifan Li Jiehua Li Yunlong Gao Hong Tan Kunjie Wang Jianshu Li Qiang Fu; This work was supported by the National Natural Science Foundation of China （51173118, 51273124, 51273126 and 51121001） and the National Science Fund for Distinguished Young Scholars of China （51425305）. We thank Prof. Zhang HR （Southwest University for Nationalities, Sichuan） for help with an- tibacterial test.; To obtain an aqueous polymer system with good antibacterial properties, a series of gemini waterborne polyurethanes （GWPU） were designed and synthesized using isophorone diisocyanate, polyoxytetramethylene glycol, p...; 关键词：ANTIBACTERIAL Gemini quaternaryammonium salt Waterborne polyurethane

Calcareous nannofossil bioevents and microtektite stratigraphy in the Western Philippine Sea during the Quaternary被引量：3: 《Chinese Science Bulletin》2011年第25期2732-2738,共7页SUN HanJie LI TieGang SUN RongTao YU XinKe CHANG FengMing TANG Zheng; supported by the Pilot Project of the National Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-221);the National Natural Science Foundation of China (40906030,40976026and40906038);the National Basic Research Program of China (2007CB815903); Two sediment cores, MD06-3050 and MD06-3047, were analyzed to study the Quaternary calcareous nannofossil and microtektite records. We dated bioevents and the microtektite impact event by calibrating with oxygen isoto...; 关键词：钙质超微化石同位素地层学第四纪菲律宾海西方沉积物岩心撞击事件

Mid-Late Quaternary loess-paleosol sequence in Lantian's Yushan,China:An environmental magnetism approach and its paleoclimatic significance被引量：10: 《Chinese Science Bulletin》2010年第26期2989-3000,共12页WU Yi ZHU ZhaoYu RAO ZhiGuo QIU ShiFan YANG Tian; supported by the National Basic Research Program of China (2004CB720200 and 2010CB833405);the Knowledge Innovation Program of Chinese Academy of Sciences (KZCX2-SW-133);the National Natu-ral Science Foundation of China (40872111); The application of rock magnetism methods to investigating the variations of magnetic minerals in the sediments is an important approach to the reestablishment of paleoclimate evolution. Thus we performed fine magneti...; 关键词：古土壤序列黄土高原古气候意义环境磁学晚第四纪中国玉山黄土沉积物

The nonmarine environment of Quaternary foraminifers in Yanghuzhuang, China: Evidence from boron and strontium isotopes被引量：3: 《Chinese Science Bulletin》2008年第14期2200-2206,共7页XIAO YingKai XIAO Jun ZHAO ZhiQi HE MaoYong LI ShiZhen; Supported by the National Natural Science Foundation of China (Grant Nos. 40373006 and 40573013); The concentrations and isotopic compositions of boron and strontium of Quaternary foraminifers and bivalve fossils collected in the Yanghuzhuang section of Yanqing, Beijing and of modern gastropods living in the Guish...; 关键词：硼锶同位素组成堆积物有孔虫海洋环境

Magnetic fabric of early Quaternary loess-paleosols of Longdan Profile in Gansu Province and the reconstruction of the paleowind directions被引量：1: 《Chinese Science Bulletin》2008年第9期1450-1452,共3页LIU Ping JIN ChunSheng ZHANG Song HAN JiaMao LIU TungSheng; Supported by 2003 Liu Tungsheng National Top Science and Technology Awards; The anisotropy of magnetic susceptibility (AMS) is a rapid and precise tool for determining paleowind directions. During the past several decades, AMS has been used for determining paleowind directions of Chinese loes...; 关键词：磁组构青藏高原风向古土壤

Interpretation and preliminary simulation of the 40 ka periodicity of the Quaternary glaciation被引量：1: 《Chinese Science Bulletin》2007年第16期2275-2284,共10页LI Nan CHEN Xingt; Supported by the National Natural Science Foundation of China (Grant No. 40475035);the National Basic Research Program of China (Grant No. 2006CB400500); More and more proxy records approved that the periodicity of the glacial cycles is about 40 ka before MPT (middle Pleistocene transition) as early as late Tertiary from 3.0 Ma to 0.9 Ma,whereas it changes to about 100...; 关键词：第四纪冰川作用米兰柯维奇理论周期性太阳暴晒

Paragenesia of Quaternary pediments and river terraces on the north piedmont of Wutai Mountains被引量：3: 《Chinese Science Bulletin》2007年第4期521-530,共10页ZHANG ShiMin REN JunJie NIE GaoZhong; Supported by the Joint Foundation of Seismology (Grant No. 101103);the project "Studies on Seismic Safety Evaluation and Anti-Seismic Structures" of China Earthquake Administration; A study has been made of the paragenetic relations of the pediments and river terraces on the northern piedmont of Wutai Mountains via geomorphologic mapping of 1:10000 scale, and an analysis on the role of tectonic, ...; 关键词：五台山北麓构造隆起断层悬崖第四纪侵蚀面河成阶地共生作用

Rapid dendrite growth in quaternary Ni-based alloys被引量：3: 《Chinese Science Bulletin》2006年第8期897-901,共5页SONG Xianzheng WANG Haipeng RUAN Ying WEI Bingbo; supported by the National Natural Science Foundation of China(Grant Nos.50121101,50271058 and 50395105);the Doctorate Foundation of Northwestern Polytechnique University;the NPU Young Teachers Scientific and Technological Innovation Foundation.; The high undercooling and rapid solidification of Ni-10%Cu-10%Fe-10%Co quaternary alloy were achieved by electromagnetic levitation and glass fluxing techniques. The maximum undercooling of 276 K (0.16TL) was obtained...; 关键词：镍基合金四元合金高过冷度枝晶长大快速凝固

Sinistral shear and extension of the northern section of Lijiang Basin in northwest Yunnan in Quaternary被引量：9: 《Chinese Science Bulletin》2005年第5期452-459,共8页HANZhujun XIANGHongfa GUOShunmin; supported by the Earthquake Science United Foundation(198023);the National Natural Science Foundation of China(Grant No.40272087).; The northern section of Lijiang Basin (NSLB) has the features of a zigzag fault, a kind of 'tracing extension' in the shape. Fault slip is characterized by both extension and sinistral shear. Average sinistral-shear a...; 关键词：云南丽江曲折断层红河顺时针旋转断层带动力学

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