Gravity wave activity and spectra in the upper mesosphere at Wuhan, China during early March 1996

Sodium layers (75–105 km) were measured by Na lidar on three nights from 1 to 3 of March 1996. The lidar data were used to calculate the relative atmospheric density perturbations and their spectra. The average r. m. s. density perturbations for early March at Wuhan are 5%. The Vertical wave number spectra exhibit power-law shapes with an average slpoes of −2. 12 in the upper mesosphere when the associated density mean quantity of the day was used. Supported by the Fundation of Chinese Academy of Science Ai Yong: born in 1958, Ph. D. graduate student     

综合地球物理在三峡重庆库区深部断裂构造特征研究中的应用

地球物理反演问题的多解性等因素决定了综合地球物理解释的必要性和重要性.在继承、分析前人研究成果基础上,运用综合地球物理研究方法和技术路线,结合野外踏勘调研资料,对现有地震、重力、航磁资料进行精细分析研究,获得了对库区深部断裂构造特征的新认识,为深入研究三峡重庆库区深部断裂构造特征,库区地震、地质灾害的监测与防治提供基础依据.     

从常数标量势讨论惯性的本质

引入了常数标量势的概念，揭示了引力场中加速度的成因．导出了若干公式，统一了引力和惯性力，并将理论与广义相对论的结果作了比较．     

河北平原区地壳结构及深部断裂特征

论述了河北平原区地壳结构、深部断裂和重力异常的主要特征，并尝试根据其地壳结构和深部断裂特征做重力异常的解释，从而表明河北平原地壳结构、深部断裂及重力异常特征有着内在的联系。     

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 .