On the existence of characteristic shapes for desert dunes

The existence of an angle of repose for sand implies that, in any given wind regime, there is at least one configuration of sand dunes which will not be altered by that wind regime. The existence of implies that the land forms constitute a convex compact subset of a Banach space, and the result then follows from Shauder's theorem.     

对J_（1－1）与D_（22）井在2次大同－阳高地震前差异异常的分析

叙述了大同市镇川堡处于口泉大断裂上的２口相距２ｍ的一组观测井在大同－阳高２次中强地震前的不同异常表现形态，探讨了产生异常差异的原因，指出这些差异似与观测井所处构造部位、地震类型、震源深度、观测条件等有关。     

任意形状截面双向偏心受压砌体构件计算探讨

结构设计规范中有关单向偏心受压砌体构件的计算方法和材料力学的一般原理，对任意形状面双向偏心、受压砌体构件的计算方法进行了探讨，给出了相应的计算公式。     

干涉SAR中地球形状与去平地效应的关系

从分析合成孔径雷达干涉处理过程中的水平地形效应入手，通过分析地形差异所导致的相位变化，得出了对于不同轨道参数的卫星去水平地形效应时地球形状的影响是不同的结论。并从理论上证明对于ERS-1和2卫星数据可以不必考虑地球形状，即可以默认大地是水平的。     

地理空间景观分异的探讨

概括总结了地理空间分异的本质、特征结构与功能，并分析了其演化特点和形成机制。     

应用SMA复合橡胶支座的桥梁隔震

本文提出了一种基于形状记忆合金的复合橡胶支座（简称SMA复合橡胶支座）的智能桥梁隔震系统，应用SMA复合橡胶支座对一受El Centro地震激励的多跨简支桥的一标准跨进行了时程分析，并与应用普通橡胶支座进行了减震、隔震效果的比较，结果表明，应用SMA复合橡胶支座隔震，不仅能取得更为显著的减震、隔震效果，而且能使地震后隔震桥梁的梁体得以复位，从而验证了SMA复合橡胶支座在桥梁隔震中的有效性、智能性和自恢复能力。     

Shape and intrusion style of the Coastal Batholith, Peru

The Coastal Batholith of Peru extends over 1600 km parallel to the coast along the Andean trend. Gravity profiles on three traverses across the batholith indicate the geometry is essentially that of a flat slab with average thickness from 2.0–3.2 km, and a thick root 4–10 km wide to the west. Granitic material does not extend to depths greater than 3 km below sea level datum.This study supports recent gravity work which indicates plutons are commonly thin, 5 km or less in thickness. Detailed mapping in the Lima segment of the Coastal Batholith reveals thin plutons where space was made dominantly by downward displacement via floor depression. However, early roof uplift also created some space. Stoping occurs but is not a major space maker. Floor depression may be modelled by cantilever or piston mechanisms and although the strong marginal deformation with mylonites, tuffisites, microbreccia, faults and shear zones suggests the piston model best describes the mechanism of emplacement of much of the Coastal Batholith some space was probably made by a cantilever mechanism. In brief, space making processes involved early roof uplift and regional doming, then floor depression mainly by piston and probably subsidiary cantilever mechanisms and, finally, local stoping producing the cut-out rectilinear nature of the batholith.The Coastal Batholith formed on shallow partial melting of hydrous basaltic marginal basin rocks between 5 and 10 km. Floor depression occurred as the crustal column foundered into an actively deflating layer of partial melt. This is an efficient space making process and is limited here to shallow levels of the upper crust only. The melts ascended to within 2 or 3 km of the surface, up dyke-like conduits then spread horizontally to form tabular plutons.     

Crystal morphology and surface structures of orthorhombic MgSiO3 in the presence of divalent impurity ions

Many rheological and transport properties of rocks are determined by the grain boundary structures of their constituent minerals. These grain boundaries often also hold a high concentration of dopant ions. Here, as a first step towards modelling the transport and rheological behaviour of the lower mantle, we report the results of lattice static simulations on the surface structures of Fe²⁺ and Ca²⁺-doped orthorhombic MgSiO₃-perovskite. For all the surfaces we studied, the energies of the doped structures are lowered, sometimes by more than 1 J/m², with respect to the pure surfaces. From our calculated crystal morphologies, we predict that the grains become more tabular as the concentration of Fe²⁺ ions increases, while under equilibrium conditions the grains are cubic. By calculating the replacement energies of Mg²⁺ by Fe²⁺ and Ca²⁺ ions in the six outermost surface layers, we conclude that these divalent ions would tend to segregate onto the crystal surfaces. We suggest, therefore, that the grain boundary structure and rheology of MgSiO₃-perovskite dominated rocks will be strongly affected by the presence of minor elements in the lower mantle.     

高速公路施工对地磁观测的影响

观测环境的破坏对地磁观测的影响是严重的,用仪器如实地记录环境的变化,用实际观测的数据来研究外界干扰的影响很有意义。利用郑州地震台的地磁资料,采用趋势分析、相关分析等方法,对高速公路施工期间的观测资料进行研究。最后得出高速公路施工的不同时期,对地磁观测的影响情况,和相同影响情况下模拟仪器和数字化仪器记录的差异。