树木年轮重建阿勒泰西部1481-2004年6-9月降水量序列

根据采自阿勒泰西部地区5个采点的树木年轮样本, 建立了该地区的树轮年表. 通过相关普查发现, 其差值年表序列与该地区当年6-9月的降水量存在明显的负相关关系, 且具有明确的树木生理学意义. 用沙勒哈(t, t 1)两个树轮差值年表序列可较好地重建该地区1481-2004年524 a来的当年6-9月的降水量, 且经过交叉检验表明重建方程稳定可靠. 分析发现, 阿勒泰西部地区524 a来的重建降水量序列具有9个偏干阶段和9个偏湿阶段, 并且具有34.8 a、 5.0～5.1 a、 4.3～4.4 a、 3.9～4.0 a、 3.7 a和3.4 a的显著干湿变化准周期. 重建降水量序列在1518年、 1548年、 1634年、 1765年、 1856年前后发生过突变.     

December 2004

Environmental Geology -     

August 2004

An extension to kinetic theory and hydrodynamic models is proposed that accounts for the existence of multi-particle contacts and leads to a correction of the cooling rate. The other hydrodynamic terms remain unchanged. In the presence of multi-particle contacts a class of different models leads to deviations from the classical inelastic hard sphere (IHS) results. For the homogeneous cooling state (HCS), as examined here, the theoretical results are found to be in perfect agreement with the numerical simulations. We acknowledge partial support from the Deutsche Forschnugsgemeinschaft (DFG) and the Israel Science Foundation, grant no. 53/01.     

Editorial 2004

I am pleased to confirm that Journal of Petrology continuesto be widely acknowledged as the premier journal in the fieldof igneous, metamorphic and experimental petrology. Althoughin 2002 (the most recent year for which data are available)our ISI Impact Factor was slightly lower at 2.903 (ranking 3rdout of 51 titles in the Geochemistry and Geophysics category)compared to 3.283 (2 out of 47 titles) in 2001, Journal of Petrologymaintains its place