PCVSAT单收站常见故障分析及处理

多年来,PCVSAT单收站为天气预报、气候研究、气象信息服务等工作作出了重要贡献.     

右江盆地三叠纪岩层极低级变质作用及地球动力学意义

 右江盆地三叠纪槽盆相浊流沉积岩系遭受过区域极低级变质作用。依据地质观察和伊利石结晶度、绿泥石-云母堆垛集合体、标志性粘土矿物及白云母(伊利石)b0参数测定资料,阐述了泥质岩石的成岩变质作用经浅层(近)变质作用到浅变质作用的转换特征。变质温度区间为150-350℃,低压类型,具高地温梯度(40-43℃/km).变质级及亚带总体与地层时代及岩层在地层柱中的位置有耦合关系,而与区域变形强度无关。最后指出区域极低级变质作用是印支-燕山构造旋回早期及区域变形前的地质事件,属于地壳伸展构造背景下右江边缘型盆地内部的埋藏型变质作用。     

PS转换波界面二次源法射线追踪

界面二次源法是最近提出的一种最小走时射线追踪方法,尤其适合层状介质中走时和射线路径的计算.该方法相对于传统的最小走时树方法（如Moser法）,仅在物性界面上设置二次源,射线路径的方向只在层界面处发生改变,该方法最大程度地消除了射线路径的锯齿状现象,同时也避免了低变速区的射线路径多值现象,因此,它具有更高的追踪精度和效率.本文采用界面二次源法在各向同性介质中实现了PS转换波射线追踪,理论模型的计算证实了界面二次源法追踪PS转换波的准确性和高效性,同时该方法在各向异性介质中也很好地追踪出分离的PSV波和PSH波,因此该方法有利于横波分裂在地震勘探中的研究和应用     

青藏高原地表分类及其东北部辐射通量的二维数值模拟

通过对青藏高原地区地表特征的格点分类及沿五道梁站的经向二维中尺度数值模拟,结果发现：青藏高原地区１３类地表特征都有,尽管其植被自西北向东南呈带状分布,但仍十分复杂;而其地表特征的这种格点分类为该地区的高分辨数值模式模拟提供了极其有用的下边界条件。地面净辐射通量及其诸分量的模拟结果与观测结果的相当接近与一致表明,该模式具有模拟青藏高原地区地面通量日变化的能力。模拟结果和观测分析还指出：夏天睛天条件下     

组件式GIS技术管理测量控制点的系统设计

测量控制点管理系统是基础地理信息系统的应用之一,许多测绘单位一般采用关系型数据管理系统（MIS）来实现,但因缺乏地理信息作数据平台,致使查询结果很不直观。为达到图、文、表并茂的效果,以方便外业测量查找控制点位,提出了利用组件式GIS（MO控件）与MIS无缝集成技术管理测量控制点的过程。实际应用表明,该技术方法能实现对测...     

万象盆地不同成钾区的水不溶矿物对比及其指示意义

老挝万象盆地属于沙空那空盆地的次级盆地,沉积了厚层的钾石盐矿,而钾石盐中还存在着部分水不溶物,通过研究不同成钾区域的钻孔发现:水不溶物主要包括硬石膏、方硼石、白云母、石英、水氯硼钙石、碳酸盐矿物以及零散的黄铁矿,通过水不溶矿物在钻孔中的分布及组合特征发现,钾盐从析出到结束,水不溶物出现规律性特征:钾石盐含量越多方硼石含量也越多,而硬石膏且越少,并在钾石盐高峰期出现鲕粒方硼石,鲕粒方硼石分布表明成钾晚期沉积环境为动荡的浅水环境。水不溶矿物组合、形貌特征及硼同位素分析研究显示,在万象盆地成钾阶段,钾盐沉积不是一成不变的而是具有明显的阶段性,其过程可以分为石盐沉积晚期,钾盐沉积早期,钾盐沉积中期和钾盐沉积晚期等4个不同阶段,其中钾盐阶段中期为钾盐沉积高峰期。因此,水不溶物研究能够很好地反演钾盐沉积环境,可作为古蒸发岩沉积研究的重要指标。     

Distance Between Two Arbitrary Unperturbed Orbits

In the paper by Kholshevnikov and Vassilie, 1999, (see also references therein) the problem of finding critical points of the distance function between two confocal Keplerian elliptic orbits (hence finding the distance between them in the sense of set theory) is reduced to the determination of all real roots of a trigonometric polynomial of degree eight. In non-degenerate cases a polynomial of lower degree with such properties does not exist. Here we extend the results to all possible cases of ordered pairs of orbits in the Two–Body–Problem. There are nine main cases corresponding to three main types of orbits: ellipse, hyperbola, and parabola. Note that the ellipse–hyperbola and hyperbola–ellipse cases are not equivalent as we exclude the variable marking the position on the second curve. For our purposes rectilinear trajectories can be treated as particular (not limiting) cases of elliptic or hyperbolic orbits.     

简论气象部门的发展战略问题——参加二区协气象管理技术会议的收获与思考

本文根据作者参加WMO二区协气象管理技术会议的体会,提出制定气象部门发展战略的观点与思路,即环境分析与对外开拓战略、缩小差距与合作战略、提高气象部门地位与加强管理战略、依靠科技进步与加强人才培养战略、满足用户需要的气象服务战略以及在投入产出的良性循环中发展气象事业的战略:并简述了制定发展战略的基本方法和步骤。     

Conjugate Points in the Gravitational n-Body Problem

In an effort to understand the nature of almost periodic orbits in the n-body problem (for all time t) we look first to the more basic question of the oscillatory nature of solutions of this problem (on a half-line, usually taken as R ⁺). Intimately related to this is the notion of a conjugate point(due to A. Wintner) of a solution. Specifically, by rewriting the mass unrestricted general problem of n-bodies in a symmetric form we prove that in the gravitational Newtonian n-body problem with collisionless motions there exists arbitrarily large conjugate points in the case of arbitrary (positive) masses whenever the cube of the reciprocal of at least one of the mutual distances is not integrable at infinity. The implication of this result is that there are possibly many Wintner oscillatorysolutions in these cases (some of which may or may not be almost periodic). As a consequence, we obtain sufficient conditions for all continuable solutions (to infinity) to be either unbounded or to allow for near misses (at infinity). The results also apply to potentials other than Newtonian ones. Our techniques are drawn from results in systems oscillation theory and are applicable to more general situations. Dedicated to the memory of Robert M. (Bob) Kauffman, formerly Professor of the University of Alabama in Birmingham