Entity

Time filter

Source Type

Ankang, China

Lu H.Y.,Nanjing University | Wang X.,Nanjing University | Sun X.F.,Nanjing University | Yi S.W.,Nanjing University | And 8 more authors.
Geologie en Mijnbouw/Netherlands Journal of Geosciences | Year: 2012

Reconstruction of a complete Quaternary record of climatic changes in the northeastern Qinghai-Tibetan Plateau is not well obtained, because of high relief and extensive surface erosion. In this study, two long cores obtained from thick loess deposits in the region, both contain clear alternations of loess and paleosols, indicating distinct climate changes during the Quaternary. The palaeomagnetic stratigraphy and optically stimulated luminescence dating indicate that the loess deposition began approximately 2.0 Ma ago, with continuous accumulation until the Holocene. Dust accumulation rates in this region are much higher than those in the central Chinese Loess Plateau, suggesting an extended dust source and/or robust transport agent. Variations of magnetic susceptibility of the loess are a good proxy index of warm/wet and cold/dry alternations and are correlated with the intensity of pedogensis. The magnetic susceptibility record reveals that a relatively cold/dry climate dominated the northeastern Qinghai-Tibetan Plateau in the Quaternary, punctuated by warm/wet phases. A stepwise strengthening of the plateau summer monsoon, with a significant strengthening at around 1200-1000 ka and at least 7 phases of strengthening of the plateau summer monsoon in the past 800 ka are interpreted from the core data. The cores provide evidence that strengthened warm/wet climates occurred at around 80-130, 190-250, 290-340, 385-420, 500-625, 690-720 and 755-780 ka, which may correlate to warm/wet phases in the Qinghai-Tibetan Plateau. The palaeoclimate changes probably were regulated by the glacial-interglacial alternations. Source


Hu M.-D.,Shaanxi Normal University | Hu M.-D.,Ankang College
Advances in Intelligent and Soft Computing | Year: 2010

In the present paper, it is proved that some special graphs, such as equilateral polygons and right triangles, exist in the classical logic metric space. In addition, there are no equilateral triangles, length of whose lines is more than or equal to , while the ones, length of whose lines can be arbitrarily close to or zero, do exist in the classical logic metric space. Lastly, it constructs an isometric reflexion transform, which can preserve the characters of the equilateral triangles, on the Lindenbaum algebra. © 2010 Springer-Verlag Berlin Heidelberg. Source


Wang Y.-R.,Shaanxi Normal University | Wang Y.-R.,Ankang College | Li S.-G.,Shaanxi Normal University
Fangzhi Gaoxiao Jichukexue Xuebao | Year: 2010

The properties of the base and sub-bases of quasi-uniformity structure are studied; at the same time, the structure of totally bounded quasi-uniformity is defined. Then it is proved, by using the methods of lattice theory, that QU (X) (the set of all quasi-uniformities one set X) is complete lattice, and TQU (X) (the set of all totally bounded quasi-uniformities one set X) is complete sub-lattice. Source


Yong L.,Ankang College
2010 International Conference on Networking and Digital Society, ICNDS 2010 | Year: 2010

China's reality social, has the specificity of centralize traditions, with no opposition parties and social organizations are not yet ripe. Due to changes in information technology and popularization of Internet users in China, led that the China's network society to be the first scale in the world's network society. According to this article, the features of the network society, such as occult, open nature, interactivity and diversity, have droved powerful public oversight, the formation of civil society, the information openness of Chinese government, and the diversity of the Chinese people's values. Of course, China need a further growth in the network society. ©2010 IEEE. Source


Li Y.,Ankang College
2011 International Conference on Control, Automation and Systems Engineering, CASE 2011 | Year: 2011

China's higher education has changed from superior education to mass education; education on talents based on needs of grass-root units is consistent with needs of job market and economic and social development in regions at primary level. According to constraints on education on talents in primary organizations, targeted measures are proposed, and a comprehensive study on higher education for primary organizations in China is also given in this paper. © 2011 IEEE. Source

Discover hidden collaborations