Discovery of a large area of ice-wedge networks in Ordos： Implications for the southern boundary of permafrost in the north of China as well as for the environment in the latest 20 kaBP

Deep sea deposits, ice cores and loess deposits have been used extensively and successfully, to study global climatic changes. Since permafrost is a consequence of cold climates, indicators of permafrost can also be used to reconstruct ancient climates in certain areas during certain periods. The recent discovery of large areas of ice wedge networks, and determination of their ages, have enabled us to locate the southern boundary of the permafrost that ex-isted in China about 20 thousand years…     

Cosmogenic ^10Be dating of Guxiang and Baiyu Glaciations

Guxiang and Baiyu Glaciations are two previously recognized local glaciations of the Tibetan Plateau. They have been widely used as the reference standard for classifying Late Quaternary glaciations on the Tibetan Plateau and its surrounding mountains. However, the numerical chronologies of both glaciations have been lacking. In this study, cosmogenic They dating was undertaken to define the timing of these two glaciations. The surface boulders deposited by the glaciers of the Guxiang and Baiyu Glaciations have exposure ages of 112.9±16.7-136.5±15.8 ka BP and 11.1±1.9-18.5±2.2 ka BP, respectively. It is likely that the Guxiang and Baiyu Glaciations correspond to marine isotope stages 6 and 2, respectively.     

Changes in plant diversity on the Chinese Loess Plateau since the Last Glacial Maximum

Changes in biodiversity during periods of glo- bal warming are of broad public concern. To study the effect of the warming process on the ecosystem, we carried out pollen analyses on samples from seven selected sections at Qingyang, Ningxian, Yangling, Binxian, Baoji, Yanshi, and Lingbao on the Chinese Loess Plateau in order systematically to evaluate changes in plant diversity since the Last Glacial Maximum （LGM）. The plant richness indices （Simpson＇s diversity index and rarefaction analysis） indicated that the plant diversity of each section increased during the process of warming from the LGM to the Holocene Optimum, especially at Baoji and Lingbao. These results are consistent with many long-timescale geological records, which show that warming can increase biodiversity; therefore, the popular viewpoint that warming leads to biodiversity loss or species extinction needs to be re-examined.     

解读钱冠连汉语语用学理论

钱冠连先生提出的汉语语用学理论与西方的“语用综观论”和“基本分析单元说”形成了三足鼎立的局面。从钱冠连汉语语用学理论产生的背景、诞生、发展和贡献不难发现,该理论立足母语语料,在前人的研究基础上形成了新的理论框架。他提出的汉语文化语用学就是人文网络言语学、语言是人类最后的家园等观点,为世界语用学理论的研究提供了新的思路,无疑是一种创新。     

邓小平中国农业现代化思想简论

在中国这样一个幅员辽阔、农业人口占80％、农业生产力水平发展极不平衡的国家，如何实现农业现代化，邓小平十分关注。邓小平认为，中国农业走向现代化，一是要根据生产力发展水平适时调整生产关系，使之适应和促进生产力发展；二是要坚持工业支持农业。促进农业现代化；三是要大力发展科技，依靠科技解决农业现代化问题。     

关于计算存货的定期后进先出法和先进先出法的简单算法

提出了定期后进先出法，该方法既保持了后进先出法在计算成本时的优点，同时也克服了其计算工作量比较繁琐的缺点．该法简单易行，在实际工作中容易掌握和具体操作．另外，还介绍了两种先进先出法的简便算法，此法具有一定的实用性．     

丢番图方程（x＋d_3k）~r＝（x＋d_3n）~r

本文证明了：当ｎ，ｘ，ｒ为正整数且ｒ＞３，ｓ为非负整数，ｄｓ＝４０ｓ＋１３，ｇｃｄ（ｘ，ｄ３）＝１，丢番图方程无整数解     

迎合与反思——走近更真实的库柏

库柏被称作美国第一个"自己的小说家".他的传世之作主要是他的"皮裹腿"系列小说.普通读者和批评家一般认为这五部小说中《最后一个莫希干人》最为成功,其被反复搬上银幕似乎更印证了这种观点的正确性.然而,库柏本人却最钟爱批评家和普通读者最不看好的《大草原》.追溯作家库柏产生的历史背景,集中分析以上两文本,对作者和以往读者的看法为何产生如此巨大的反差这一论题作了深入探讨和论证.     

Inverse correlation between ancient winter and summer monsoons in East Asia？

There is a scientific debate on the relationship between ancient winter and summer monsoons in East Asia. Some scholars think that East Asian winter and summer monsoons are anti-correlated, and others think not. For this reason, this study is motivated to assess their linkage from the paleoclimate simulation perspective, through analyzing the Last Glacial Maximum （LGM） and mid-Holocene （MH） climate simulated by CCSM3 model. Compared to the present climate, the Aleutian low is found to be deepened and the East Asian winter monsoon （EAWM） is stronger during the LGM winter. The Pacific high in summer is noticed to be weakened and the East Asian summer monsoon （EASM） is weaker at the LGM. During the MH, the Aleutian low and the Asian high in winter are intensified, and the Asian low and the Pacific high in summer are enhanced, indicating that the EAWM and EASM are both stronger than today. Therefore, the EAWM is not always negatively correlated to the EASM. Their relationship may be different at different geological stages. It can be obtained at least from the numerical simulation results that the EAWM and the EASM is negatively correlated during the cooling period, while positively correlated during the warming period.