精化地球重力场模型中SST距离的观测方程

在卫星受摄运动分析的基础上，给出了在利用卫星跟踪卫星(SST)精化地球重力场模型中，SST卫星之间距离的观测方程，实际上是地球引力位的一阶导数。     

On the parameterization scheme of gravity wave drag effect on the mean zonal flow of mesosphere

Based on McFarlane抯 parameterization scheme of gravity wave drag, a refined gravity-wave-drag scheme is presented. Both the drag effect of the momentum flux and the dissipation effect of gravity wave breaking on the mean zonal flow are included in the refined parameterization scheme. The dissipation effect can be formulated with the gravity wave numbers and the mean quantities. The refined parameterization scheme may represent a complete drag effect of stationary gravity wave breaking on the mean zonal flow.     

GPS radio occultation: A potential new data source for improvement of antarctic pressure field

Radio occultation technique, first demonstrated by the GPS/MET experiment in 1995[1], has the potential to provide improved spatial and temporal resolution in the probing of the Earth's neutral atmosphere, including pressure,temperature and water vapor profiles, in addition to traditional measurements (e.g.,radiosonde, spaceborne radiometers) and ground-based GPS networks for precipitable water vapor (PWV) measurements. This paper provides an overview of the radio occultation concept and retrieval procedure and current technical limitations including lower troposphere inhomogeneities, signal penetration, multipath, and water vapor ambiguity. The current limitations using atmospheric model pressure fields (ECMWF and NCEP) for the modeling of atmospheric mass load over Antarctica, for its separation from climate sensitive signals observed by gravity mapping satellite,GRACE, are quantified. Atmospheric pressure fields over Antarctica are poorly known and higher temporal variability of pressure causes an "aliasing" error in GRACE-observed climate-sensitive signals such as hydrology, mass balance and oceanic mass variations. In particular, comparison of ECMWF 6-hour data with the Automatic Weather Station (AWS) in Antarctica indicates mean differences of 5 hPa,and rms of 1.7 hPa, exceeding the accuracy requirement for GRACE. Aliasing effec tmanifests as high-frequency errors in GRACE-observed gravity signals and are more pronounced over Antarctica. The possibility of using current operating satellite(SAC-C, CHAMP and GRACE) occultation data to improve Antarctic surface pressure fields is proposed. Preliminary results indicate that in the absence of water vapor over Antarctica, retrieved CHAMP pressure profile agrees well with radiosonde data from Neumayer station, and that occultation signals reach near the surface.     

超重力碳分制备拟薄水铝石的中试研究

对利用超重力法制备纳米级拟薄水铝石进行了系统的中试研究，研究表明：小试提供的工艺路线是可行的，给出的生产条件基本正确。提出了中试生产纳米级拟薄水铝石的最佳条件：偏铝酸钠溶液浓度1mol/L，气液体积比为2，反应终点pH＝10.5，反应温度(20±2)℃。     

科研院所综合评价指标体系和评价方法

随着经济改革的深化,科技体制改革已发生巨大变化.用来评价科研院所的绩效和素质的指标体系由4个指标组构成,即人力财务资源、业绩成果、发展后劲和财务管理.采用模糊集重心作为共同的标准,完全有可能分析基本评价指标、中间和最终评价结果的等级分布.这种创新方法能为决策者提供丰富的信息.     

对重力作用下Al-Si/SiC颗粒系统二维凝固过程的数值模拟

论文采用多相流模型对重力作用下Al Si 7% (质量分数 ) /SiC颗粒功能梯度材料二维凝固过程进行了数值模拟 .计算了在不含颗粒、含有小尺寸颗粒和含有大尺寸颗粒几种不同条件下颗粒和液相的运动 ,产生的宏观偏析 ,共晶合金在晶体中所占比例 ,以及最终的颗粒分布 .结果表明 ,颗粒和糊状区的存在会使液态金属的流动阻力增大 ,流速降低 ,产生的宏观偏析减弱 .在含有小尺寸颗粒的情况下 ,液相和颗粒运动速度很小 ,大部分区域保持初始颗粒体积分数不变 .在含有大尺寸颗粒的情况下 ,颗粒沉降速度很快 ,在底部形成颗粒堆积区 ,在上部形成颗粒体积分数为零区 .     

吐鲁番——哈密盆地重力异常分析

利用趋势面分析法对吐鲁番盆地东部地区的布格重力异常进行数据处理,划分出区域异常和局部异常,运用地质和地球物理方法对该区二叠纪盆地基底形态作出比较全面的解析。     

异弹模重力坝模型试验及应力研究

旨在应用实验方法和理论方法探讨重力坝的面板与坝体应力分布情况，特别是异弹模比大于５时坝应力的分布情况，为简捷计算法提供依据．     

彭县地区飞来峰的特征及形成演化

彭县地区飞来峰根据其内部构造特征和力学成因可分为两类──推覆体和滑覆体。推覆体是挤压环境下的产物，它形成于晚三叠世末期的印支运动。滑覆体是拉张环境下重力滑动的产物，它形成于燕山──喜马拉雅期。推覆体是滑覆体的“母体”。     

阻塞法化简逻辑电路

本文根据布尔代数的基本定理,引入“阻塞逻辑”的定义,讨论用“阻塞法”化简逻辑函数的具体方法,同时提出卡诺图“1”重心、“0”重心的概念及实现变量单轨输入的方法。