日月影响与云南未来地震趋势研究

详细分析了20世纪云南强震群体盛衰的天文背景,文中指出月亮白赤交角变化产生的交点潮[1]可能是影响地震长周期活动的一个原因。分析结果表明,20世纪以来云南的4个M≥6.7级强震活跃期有3个始发于月亮白赤交角极大年或其次年,仅第一个地震活跃期不是如此,所以总概率达80%。另外,无论太阳活动还是地震活动均存在11年的准周期,据此,作者利用20世纪云南历年最大地震的震级作了4组11年周期的外推,估计了下一个地震活跃期首发地震的时间和震级。综括上述2个天文条件,根据目前月亮白赤交角变化与太阳活动形势,我们认为云南下一个地震活跃期可能开始于2006/2007年,并可能持续活动至2015年,该期间将有较多M≥6.7级地震发生,将构成云南又一个地震重灾期。文中还对强震首发地点作了预测估计。     

根据航磁数据探讨阿尔金断裂带的结构及构造演化

阿尔金断裂带是西北地区一条重要的走滑断裂带.通过对阿尔金断裂带及周边地区航磁资料的化极、解析延拓处理,获得了很多有关断裂及地质体的信息.在此基础上分析了阿尔金断裂带的主要断裂的地质-地球物理特征及位移幅度,对盖层与基底的拆离进行了正反演拟合,结合地质资料探讨了阿尔金断裂带的形成时限和演化历史.     

湖南省经济增长极研究

本文借助增长极理论,研究了湖南空间开发的基本格局,阐明了地域发展必须以经济水准较高的城市为成长核心,运用多元分析方法确定了不同层次的增长极,最后指出本世纪内湖南城市经济建设重点应是长沙、株洲、湘潭城市群和岳阳市。     

Relationships between air mass properties and mesoscale rainfall in New Zealand's Southern Alps

This paper identifies relationships between air mass properties and mesoscale rainfall when moist air blows over New Zealand's Southern Alps from the Tasman Sea. Around 50% of the variance in six-hourly rain volumes summed across three separate cross-mountain raingauge transects and in six-hourly rain volume spilling across the alpine divide are statistically explained by the following properties of the approaching air mass: relative humidity, wind velocity normal to the mountains, air mass stability and synoptically induced upward motion. These factors also explain about 25% (r≈0.5) of the variance in the downwind distance reached by the spillover rainfall. For the highest 10% of six-hourly rainfalls, spillover distance and magnitude are negatively correlated with the 700 or 500 hPa temperature. Multiple linear regression equations suitable for predicting rainfall intensity and spillover are developed. A progression is described in the magnitude and depth of vertical motion and resulting condensation rates over the mountains as the properties of the incoming air mass evolve through a storm. These changes, together with greater downwind advection of ice particles compared to raindrops, explain the observed statistical relationships between the air mass properties and mountain rainfall.     

织构仪控制系统微机改造及视窗化程序设计

在分析了织构仪结构的基础上, 着重介绍此仪器的改造方法, 包括计算机接口设计、运用于WINDOWS95操作系统中的软件设计, 并充分考虑了系统的安全性和操作的实用性.      

羌北地块早-中志留世古地磁学初步研究结果及其构造意义

本文报道羌北地块早-中志留世龙木措组灰岩古地磁研究初步结果,据此探讨羌北地块早-中志留世的古位置及其起源问题.在日土县龙木措北岸(34.4°N,80.3°E)龙木措组中采集了10个采点,共125块古地磁独立定向样品.岩相学与岩石磁学结果表明样品中主要载磁矿物为磁铁矿.系统热退磁与交变退磁显示,退磁曲线具有双分量或单分量...     

Geometrical Properties of Galaxy Clusters

Empirical and analytical procedures are developed to determine the morphological properties of galaxy clusters. The apparent orientations and shapes are obtainted in two dimensional space while the direction towards the cluster pole is found in three dimensional space. These properties were determined for three Abell clusters and found to be strongly related. This revised version was published online in July 2006 with corrections to the Cover Date.     

The westward drift of the lithosphere: A tidal ratchet?

Is the westerly rotation of the lithosphere an ephemeral accidental recent phenomenon or is it a stable process of Earth's geodynamics? The reason why the tidal drag has been questioned as the mechanism determining the lithospheric shift relative to the underlying mantle is the apparent too high viscosity of the asthenosphere. However, plate boundaries asymmetries are a robust indication of the ‘westerly’ decoupling of the entire Earth's outer lithospheric shell and new studies support lower viscosities in the low-velocity layer (LVZ) atop the asthenosphere. Since the solid Earth tide oscillation is longer in one side relative to the other due to the contemporaneous Moon's revolution, we demonstrate that a non-linear rheological behavior is expected in the lithosphere mantle interplay. This may provide a sort of ratchet favoring lowering of the LVZ viscosity under shear, allowing decoupling in the LVZ and triggering the westerly motion of the lithosphere relative to the mantle.     

利用GPS数据与Klobuchar模型估计地磁北极

基于地磁坐标和地理位置的关系,利用Newton迭代法推导了地磁北极的计算公式;根据Klobuchar模型中电离层电子含量与地磁位置的关系,给出地磁位置的表达式;进而建立了GPS观测量估计地磁北极的模型.理论分析和数据验证了方法的可行性,得出1)Klobuchar模型属于全球性的电离层估计模型,对于区域性电离层信息描述的不十分准确,建立区域化Klobuchar模型将更有利于地磁北极的估计;2)利用泰勒公式将Klobuchar模型线性化的过程中,公式仅取其一阶项,将会影响模型的精度,有待于提高模型的展开阶数;3)实际中地磁北极的估计结果受初始值得约束;4)不同计算方法和模型对结果的可靠性有所影响,试图选择其它估计过程和方法,提高估计的可靠性.     

一种改进的低纬度磁场化极方法——变频双向阻尼因子法

本文在考察分析原有的低纬度化极阻尼因子的基础上,提出了对原有阻尼因子的改造方法,即提出变频双向阻尼因子,改造后的阻尼因子不仅考虑了对振幅的压制,并兼顾了对相位谱的改造,同时还增加了频率控制因子.通过模型数据和实际资料检验,表明在低纬度地区,特别是在极低纬度地区,变频双向阻尼方法的化极结果能更有效地突出地质信息.