硅灰石矿物发光材料的人工合成研究

对硅灰石矿物发光材料进行了人工合成研究，在合成试样中，分别掺入少量Ｅｕ＾３＋，Ｇｄ＾３＋，Ｐｂ＾２＋，Ｍｎ＾２＋等激活剂，于１０００℃或１１８０℃条件下分别通入Ｈ２Ｓ（ｇ），Ｈ２Ｏ（ｇ）以及用ＮＨ３，Ｈ２Ｏ吸收ＣＯ２（ｇ）等方法进行合成低温ＴＣ型三斜硅灰石和高温型假硅灰石，合成产物通过扫描电镜、Ｘ射线衍射和红外光谱实验，对合成过程中温度高低，时间长短、冷却快慢、降低温度合成高温型假硅灰石的方法进行     

Estimation of tree transpiration and response of tree conductance to meteorological variables in desert-oasis system of Northwest China

Transpirations of three dominated tree species, namely Mongol Scotch Pine (Pinus sylvestris var. mongolica Litvin), White elm (Ulmus pumila) and Gansu Poplar (Populus gansuensis Wang et Yang) in oasis shelter forest (Linze site) and of two dominated tree species, namely Euphrates Poplar (Populus euphratica Oliv.) and Russia olive (Elaeagnus angustifolia Linn.) in lowland desert (Erjinaqi site) have been estimated using measured sapflow in summer, autumn and winter, 2002 and in spring, 2003. An ENVIS System was used for each site to measure microclimate variables, soil moisture and sapflow every half an hour, and the study time scale is one day. In the 104 days of observation during the growing season at the Linze site, the average daily sapflow of Gansu Poplar is 9.93 L· d^-1, and the average transpiration per unit leaf area is 1.99 mm · d^-1. For White elm tree, the daily average sapflow is 4.08 L· d^-1, while the daily average transpiration per unit leaf area is 0.49 mm · d^-1. The values for Mongol Scotch Pine are 3.91 L· d^-1 and 0.25 mm · d^-1, respectively. In the total 73 days of observation during the growing season at the Erjinaqi site, the daily average sapflows of Russia olive and Euphrates Poplar are 12.1 and 20.97 L· d^-1, respectively, and the average transpirations per unit leaf area are 0.22 and 0.31 mm · d^-1, respectively. In the observation period of the growing season, tree conductances of Mongol Scotch Pine, White elm, Gansu Poplar or Russia olive show an exponential relationship with the daily average air temperature or vapour pressure deficit, but the relationship is not so obvious between tree conductance and global radiation. The transpiration process of each tree species is affected by all the observed four environmental variables. The response of tree conductance to different climatic factors changes with tree species. The effect of the same factor to the same tree species is also variable in different growing stages. The sapflow of every tree species is relatively large in later spring to early summer, and low in summer, and then reaches its largest value in later September. In the mid-November, the sapflow is relatively large, especially the deciduous tree species. This may be characteristic of the tree species in Arid Regions of Northwest China.     

春季滇东南强对流天气的高空环境场分析

应用云南蒙自探空站2001～2004年的高空风、特性层资料分析了滇东南上空冬、春季副热带急流的时空分布特点及其对大气层结的影响,结合蒙自711数字化雷达站在其春季(3～4月)中观测到的强冰雹云回波进行分析。结果表明,春季高空副热带急流是造成滇东南地区大气不稳定层结的重要因子之一,天气系统触发不稳定大气层结产生强冰雹云,副热带急流具有加强、维持发展的作用。     

鲜水河断裂带蠕变观测与地震

统计了布设在鲜水河断裂带上的DSJ断层水平位移测量仪建场以来发生的“短周期事件”年频次，用消除年变、一阶差分等计算方法处理DSJ数据并与DSJ同一场地的短基线数据进行对比分析，结果显示：DSJ“短周期事件”有地震前兆意义，具有无震蠕滑性质：蠕变波是可以在同一断层上传播的，并可触发地壳破裂。     

PMOE精密行星历表研究进展

本文扼要介绍了PMOE行星历表研究当前的进展和工作 ,给出了PMOE2 0 0 2与DE40 5历表的比较。     

多目标效用函数和模糊数学论在重庆市万州区中稻产量预报上的应用

运用多目标效用函数和模糊数学论方法，分析了影响重庆市万州区中稻产量的主要气象因子，并通过一系列的数理转换，建立了万州区中稻气象产量预测预报生态模型，以此开展对外服务。     

石河子垦区一次低压大风天气的成因分析

通过对石河子一次低压大风天气的成因分析，发现“降压增温”是其前兆。前期降水，有利的垂直风场．不稳定能量释放是低压产生持续大风的关键，并提出今后的预报着眼点。     

Code and carrier phase based short baseline GPS positioning: computational aspects

A recursive least squares algorithm is presented for short baseline GPS positioning using both carrier phase and code measurements. We take advantage of the structure of the problem to make the algorithm computationally efficient and use orthogonal transformations to ensure that the algorithm is numerically reliable. Details are given for computing position estimates and error covariance matrices with possible satellite rising and setting. Real data test results suggest our algorithm is effective.This research was supported by NSERC of Canada Grant RGPIN217191–99, FCAR of Quebec Grant 2001-NC-66487, and NSERCGEOIDE Network Project ENV#14 for Xiao-Wen Chang, and by NSERC of Canada Grant RGPIN9236–01 for Christopher C. Paige.The online version of the original article can be found at     

Hilbert-Huang变换与地震信号的时频分析

本文介绍了HHT时频分析方法及瞬时频率的概念，给出了已知信号的经验模态分解及其时频分布，并对实际地震波形信号进行了HHT时频处理与剖析。结果表明，HHT方法能准确描述地震波形信号的非线性时变特征，是地震信号时频分析的有效工具。     

北京地区小震活跃与首都圈地区中等地震活动关系研究

通过研究北京地区的小震活跃与首都圈地区中等地震活动的关系，发现1999年到2003年间频度异常与首都圈地区Ms4．0以上地震具有一定对应关系，但频度异常对未来地震地点判定的意义不大，需要将北京地区小震频度异常和首都圈及附近地区小震活动的有序性特征有机结合起来，才能更好地把握中等地震发生的时间和地点，最后指出，频度异常指标具有一定的时间性特征。