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991.
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《江西省气象局业务技术体制改革实施方案》编写组 《气象与减灾研究》2005,28(4):47-50
对江西气象科技创新体系改革与建设的内容和方向进行了论述,认为江西气象科技创新体系改革与建设,应坚持“自主创新,重点跨越,支撑发展,引领未来”的科技发展方针,明确科技型、基础性社会公益事业定位,深入实施科技兴气象战略,深化气象科技体制改革,加强原始创新、集成创新和引进消化吸收再创新;促进业务与科研的结合,形成科技创新引领事业发展的研究型业务,提升气象科技创新能力,提高气象科技水平和气象业务的科技含量,提高气象队伍素质,培养造就具有创新能力、既懂科研又懂业务的学科、技术带头人和复合型人才。 相似文献
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EH4电磁成像系统在砂岩地区勘查地下水的应用研究 总被引:27,自引:2,他引:25
EH4电磁成像系统是1套电磁自动采集和处理系统,它是CSAMT和MT的结合体.本文介绍了EH4电磁成像系统的原理、特点和该系统在砂岩地区,如内蒙、新疆、云南等地区进行地下水勘查的应用实例和效果 相似文献
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Flow failure of sandy subsoil induced by seismic liquefaction is known to cause significant damage to structures. It is induced not only by the dynamic forces exerted by seismic acceleration but also by the static gravity force in consequence of the topography of the ground. The ground flow may sometimes continue after the end of the seismic loading and finally the ground is significantly deformed to cause a failure.This paper numerically predicts the magnitude of flow that could occur when soil liquefaction continues for a sufficiently long period. It is considered that liquefied soil behaves like a viscous liquid, and hence, ground flow is governed by the principle of minimum potential energy. In the calculation, liquefied sand is assumed to be a viscous liquid that deforms in undrained conditions with its volume remaining constant. To consider the non-linearity due to large displacement, the updated Lagrangian method is used to solve the equation of motion. The Newmark β method is employed to calculate the time history of the ground motion. Finally, a simulation using this calculation method shows that the proposed method gives reasonable results for the conditions indicated. 相似文献
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In this paper, a study on the transient response of an elastic structure embedded in a homogeneous, isotropic and linearly elastic half-plane is presented. Transient dynamic and seismic forces are considered in the analysis. The numerical method employed is the coupled Finite-Element–Boundary-Element technique (FE–BE). The finite element method (FEM) is used for discretization of the near field and the boundary element method (BEM) is employed to model the semi-infinite far field. These two methods are coupled through equilibrium and compatibility conditions at the soil–structure interface. Effects of non-zero initial conditions due to the pre-dynamic loads and/or self-weight of the structure are included in the transient boundary element formulation. Hence, it is possible to analyse practical cases (such as dam–foundation systems) involving initial conditions due to the pre-seismic loads such as water pressure and self-weight of the dam. As an application of the proposed formulation, a gravity dam has been analysed and the results for different foundation stiffness are presented. The results of the analysis indicate the importance of including the foundation stiffness and thus the dam–foundation interaction. 相似文献
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The claim that there exists a transition of earthquake energy distribution between small and large earthquakes is checked using broadband radiated energy of earthquakes for global seismicity. Scattering of the relation between the magnitude and the broadband radiated energy makes it necessary to use the energy data directly. Rank-ordering statistics is applied to enhance the resolution in retrieving the power law distribution with undersampled data, namely, a few tens of events. Seen in the perspective of broadband radiated energy with higher resolution, there is no evidence for the kink in the frequency-energy distribution for large and small earthquakes. Instead, a single power law can well explain the data. For earthquakes with energy larger than 10~(14) J, we find that the number N of events with energy E depends on E via N ∝ E-B, with the scaling constant B = 0.64 ± 0.04, corresponding to b = 0.95± 0.06. 相似文献
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江苏早第三纪地层 ,大部分隐埋于地下 ,对其研究 ,只能依据大量钻孔资料 ,分歧意见较多。通过对直溪桥盆地钻孔中系统孢粉资料的全面分析对比 ,来确定该地区的地层层序及时代归属 ,从而阐明早第三纪时期的古气候及古环境 相似文献