维普中文期刊产品整合服务
10篇 您的检索式:作者名="Han Wenxia"
    题名 作者 年代 出处 被引量
1An 8.1Ma calcite record of Asian summer monsoon evolution on the Chinese central Loess Plateau显示文摘Carbonates in loess-red clay sequences consist mainly of calcite and dolomite. The EDTA analysis of carbonates in different size fractions and magnetic susceptibility reveal that calcite is a sensitive index of summer monsoon. The chemical analysis of carbonates and calcite from an 8.1 Ma loess-red clay sequence at Chaona on the Chinese central Loess Plateau shows that the evolution of the Asian summer monsoon experienced four stages, namely 8.1―5.5 Ma, 5.5―2.8 Ma, 2.8―1.5 Ma and 1.5―0 Ma, with increasing intensification and fluctuation, suggesting a possible combining impacts of uplift of the Tibetan Plateau and global changes on the Asian summer monsoon.CHEN XiuLing FANG XiaoMin AN ZhiSheng HAN WenXia WANG Xin BAI Yan HONG Ye 2007Science China Earth Sciences2007,50,3:16
2Late Eocene pollen records and palaeoenvironmental changes in northern Tibetan Plateau显示文摘The Eocene palaeovegetation landscape and palaeoclimate reconstructed from the pollen records in the Jiuquan Basin, northwest China provide some important information on the early uplift of the Tibetan Plateau and the origin and evolution of the aridification in northwest China. The records show the arid-semiarid scrubs with open forest palynofloras controlled by the subtropical high existed in northwest China during the 40.2-33.4 Ma. Four pollen assemblages are found: Nitrariadites-Cheno-podipollis-Pinaceae assemblage (40.2-37.9 Ma) is followed by Chenopodipollis-Nitrariadites assemblage (37.9-34.6 Ma), Pinuspollenites & Abietineaepollenites-Chenopodipollis assemblage (34.6-33.9 Ma), and Chenopodipollis-Nitrariadites assemblage (33.9-33.4 Ma). The percentage of thermophilic types is in anti-correlation with that of the dry types, which means the palaeoclimate is relatively warmwet or cold-dry during most of that time. Such aridity may be related to the water vapor reduction and the planetary wind system movement northward in response to the cooling caused by small-ephemeral icesheets.MIAO YunFa FANG XiaoMin SONG ZhiChen WU FuLi HAN WenXia DAI Shuang SONG ChunHui 2008Science China Earth Sciences2008,51,8:10
3Response of grain size of Quaternary gravels to climate and tectonics in the northern Tibetan Plateau显示文摘The widely distributed thick gravel deposits along the rim of the Tibetan Plateau have been long thought to be the product of rapid tectonic uplift of the plateau. However, this has been challenged by recent works that suggest these thick gravels may be the result of climate change. In this paper we carried out a detailed field measurement of gravel grain sizes from the Jiuquan and Gobi Gravel Beds in the top of the Laojunmiao section in the Jiuxi Basin in the northern margin of Qilian Mts. (northern Tibetan Plateau). The results suggest that the grain sizes of the Jiuquan and Gobi Gravel Beds over the last 0.8 Ma are characterized by nine coarse-fine cycles having strong 100-ka and 41-ka periodicities that correlate well with the loess-paleosol monsoon record and isotopic global climatic record from deep sea sediments as well as by a long trend of coarsening in gravel grain size. The coarse gravel layers were formed during the warm-humid interglaciations while the fine layers correspond to the cold-dry glaciations. Because the paleoclimate in NW China began to get dramatically drier after the mid-Pleistocene, we think the persistent coarsening of gravel grain size was most probably caused by the rapid uplift of the northern Tibetan Plateau, and that the orbital scale cyclic variations in gravel grain size were driven by orbital forcing factors that were superimposed on the tectonically-forced long-term coarsening trend in gravel size. These findings also shed new light on the interaction results of climate and tectonics in relation to the uplift of the Tibetan Plateau.FU KaiDao FANG XiaoMin GAO JunPing HAN WenXia LI LiLi 2007Science China Earth Sciences2007,50,1:3
4The earliest well-dated archeological site in the hyper-arid Tarim Basin and its implications for prehistoric human migration and climatic change显示文摘Han Wenxia Yu Lupeng Lai Zhongping 2014Quaternary Research2014,82,1:1
5Wind erosion on the north‐eastern Tibetan Plateau: constraints from OSL and U‐Th dating of playa salt crust in the Qaidam Basin显示文摘Wenxia Han Zhibang Ma Zhongping Lai Erwin Appel Xiaomin Fang Lupeng Yu 2014Earth Surf Process Landforms2014,,6:1
6Late Miocene-Pleistocene aridifieation of Asian inland revealed by geochemical records of lacustrine-fan delta sediments from the western Tarim Basin, NW China显示文摘ZHANG Zhigao HAN Wenxia FANG Xiaomin 2013Palaeogeography Palaeoclimatology Palaeoecology2013,377,1:1
7Evaluation Method for Voltage Fluctuation Performance Considering Cyber Soft Failure显示文摘Voltage regulation based upon cyber systems has been extensively used with the development of cyber-physical systems.Still,cyber failure may result in controlling failure,which inevitably has an effect on the overall voltage performance of distribution networks.In order to access the influence of a cyber fault on voltage regulation,a cyber system validity model considering cyber soft failure is proposed.The analytical approach of voltage fluctuation and measurement indices of voltage fluctuation are also developed.Based on a simulation of a IEEE 33-bus system,the proposed model is proved to simulate the voltage regulation process taking cyber soft failure into consideration.Each influence of different fault factors is analyzed,which provides practical technical support for the planning and operation of the distribution system.This paper provides strategies for the research into cyber fault of distribution networks,which has critical significance along with follow-up value.Wenxia Liu Hanshen Li Yuchen Huang Hui Han Jun Li Bing Liu 2022CSEE Journal of Power and Energy Systems2022,8,1:1
8Dynamics in a ratio-dependent predator-prey model with predator harvesting显示文摘Xiao Dongmei Li Wenxia Han Mao-An 2006J Math Anal Appl2006,324,1:1
9Optimization of PCR System in EST-SSR Analysis of Phytophthora infestans显示文摘Late blight caused by the oomycete Phytophthora infestans Montagne de Bary is a devastating disease on potato production. A total of six parameters affecting the PCR system in P. infestans were investigated based on the template DNA of the isolate HH06-23 and EST-SSR primer pair Pi08N. The results showed that the optimal annealing temperature was 63℃, and the optimum PCR system of EST-SSR was 25 ng template DNA, 0.5 mmol·L-1 dNTPs, 2 μL 10×Buffer (Mg 2+ free), 1.75 mmol·L-1 MgCl 2 , 15 pmol primer, and 1.2 U Taq DNA polymerase in total 20 μL reaction system. The PCR program was initial denaturation at 94℃ for 2 min, followed by 35 cycles of 94℃ for 30 s, 63℃ for 30 s, and 72℃ for 30 s, then a final extension step was 72℃ for 7 min, and held at 4℃. In addition, using the optimal PCR system, a total of 20 isolates of P. infestans were used for testing the stability and polymorphism of the PCR amplification. The clarity and abundant polymorphism indicated that this system was stable and suitable for researching the genetic diversity of P. infestans population.WANG Jianan LU Wenhe JIN Guanghui BAI Yamei LI Wenxia HAN Yingpeng 2010Journal of Northeast Agricultural University(English Edition)2010,17,1:0
10Deep Drilling Campaign in the Western Qaidam Basin,NE Tibetan Plateau and their Revealed Global Temperature Forcing of Salt Formation in the Late Miocene-Quaternary显示文摘The Qaidam Basin in the NE Tibetan Plateau has contributed the largest amount of potash in China.However,how the potash was formed has long been a subject of debate.Here we carried out a deepFANG Xiaomin LI Minghui Erwin APPEL WANG Jiuyi HAN Wenxia ZHANG Weilin YANG Yibo CAI Maotang 2014Acta Geologica Sinica(English Edition)2014,88,S1:0
返回顶部 每页显示:
共1页 首页 上一页 第1页 下一页 末页 /1 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费