辽宁区域地震短波数据通信网的架设与技术改进     

刘日轩  金众范 《东北地震研究》1992,(1)

通过架设地震无线短波数据通信网的实践,阐述了实现地震数据通信的可行性、优越性、实施技术措施,并较详尽的介绍了设备间的接口、接口连接以及对不具备专用通信接口的电台实现数据传送的接口改进等。本文对即将建立数字通信网的部门有一定的指导作用。对已建立数字通信网的部门可做为借鉴和参考。  相似文献   

基于改进差分进化算法的大地电磁测深和重力宽范围物性约束联合反演          下载免费PDF全文

曾志文  陈晓  杨海燕  张志勇  郭一豪  刘星  叶益信 《地球物理学报》1954,63(12):4565-4577

宽范围物性约束技术容易实现、具有一定容错性,目前已在大地电磁测深（MT）和地震、MT和重力联合反演中实现,但该技术是结合模拟退火算法实现的.差分进化算法（DE）是一种全局优化算法,但该算法在地球物理联合反演领域应用较少.基于此,本文以双种群设置方案为框架改进了DE算法,并提出了基于改进DE算法的宽范围物性约束技术.MT和重力联合反演的模型试验表明：与传统的DE算法相比,改进的DE算法收敛速度更快,寻优能力更强;基于改进DE算法的宽范围物性约束技术可以促进不同岩石物性参数在一定"范围"内实现耦合,既可以利用岩石物性关联的导向作用,又可以发挥优化算法的寻优能力,进而降低地球物理联合反演对先验信息的要求;此外,该技术的实现也验证了宽范围物性约束思想在联合反演领域中的适用性,具有进一步推广至其他优化算法中的潜质.  相似文献   

The investment climate for climate investment: Joint Implementation in transition countries     

Samuel Fankhauser  Lucia Lavric 《Climate Policy》2003,3(4):417-434

Transition countries are expected to become important players in the emerging market for greenhouse gas emission reductions, as they can cut emissions at a relatively low cost. However, the attractiveness of the region as a supplier of emission reductions will not only depend on its cost advantage. It will also depend on the business climate offered to carbon investors—factors like a well-functioning legal and regulatory system, economic and political stability and the capacity to process emission reduction projects efficiently. This paper looks at the carbon investment climate in the transition countries eligible for Joint Implementation (JI)—Russia, Ukraine, Croatia and the EU accession countries. It concludes that JI investors will face a clear trade-off between the scope for cheap JI on the one hand, and the quality of the business environment and JI institutions on the other. The countries with the highest potential for cheap emission reductions also tend to be the countries with the most difficult business climate and the least institutional capacity for JI. The most attractive JI locations may be median countries with a reasonable JI potential and an acceptable business climate, such as Bulgaria, Romania and the Slovak Republic.  相似文献   

Convergence or divergence?: Status and prospects for US climate strategy     

Atle Christer Christiansen 《Climate Policy》2003,3(4):343-358

The objective of this paper is to assess recent developments and prospects for future changes in United States (US) climate strategy. In doing so, the paper explores some of the key factors that have shaped strategies and policies to date, distinguishing between factors related to institutional and governance structures, linkages between science and policy, energy technology and the role of interest groups. Against this background, the paper attempts to explore future development paths for US climate policy. More specifically, the paper assesses opportunities for policy changes compared to the preferences of the current administration, and the prospects for future linkages between US and international climate change strategies. In brief, the paper argues that substantial changes are unlikely to take place in the near to medium term, leaving open, however, the possibility of wide-ranging changes in domestic politics or major incidents that could facilitate a shift in the perceived need for near-term action.  相似文献   

Seismic anisotropy of the lithosphere around the Trans-European Suture Zone (TESZ) based on teleseismic body-wave data of the TOR experiment     

TOR Working Group  J. Plomerov  V. Babu ka  L. Vecsey  D. Kouba 《Tectonophysics》2002,360(1-4):89-114

A passive teleseismic experiment (TOR), traversing the northern part of the Trans-European Suture Zone (TESZ) in Germany, Denmark and Sweden, recorded data for tomography of the upper mantle with a lateral resolution of few tens of kilometers as well as for a detailed study of seismic anisotropy. A joint inversion of teleseismic P-residual spheres and shear-wave splitting parameters allows us to retrieve the 3D orientation of dipping anisotropic structures in different domains of the sub-crustal lithosphere. We distinguish three major domains of different large-scale fabric divided by first-order sutures cutting the whole lithosphere thickness. The Baltic Shield north of the Sorgenfrei–Tornquist Zone (STZ) is characterised by lithosphere thickness around 175 km and the anisotropy is modelled by olivine aggregate of hexagonal symmetry with the high-velocity (ac) foliation plane striking NW–SE and dipping to NE. Southward of the STZ, beneath the Norwegian–Danish Basin, the lithosphere thins abruptly to about 75 km. In this domain, between the STZ and the so-called Caledonian Deformation Front (CDF), the anisotropic structures strike NE–SW and the high-velocity (ac) foliation dips to NW. To the south of the CDF, beneath northern Germany, we observe a heterogeneous lithosphere with variable thickness and anisotropic structures with high velocity dipping predominantly to SW. Most of the anisotropy observed at TOR stations can be explained by a preferred olivine orientation frozen in the sub-crustal lithosphere. Beneath northern Germany, a part of the shear-wave splitting is probably caused by a present-day flow in the asthenosphere.  相似文献   

岩石节理对大石林景观空间结构塑造和控制     

姚振国  梁永宁  祝传兵  古兴伟  王建良 《云南地质》2005,24(2):212-217

大石林景区节理走向集中在NW30°～60°以及NE50°～75°两个方向,形成“X”型共扼性质,表现出高密度、高角度、深切割、延伸长的特点。景区剑状石林与溶蚀洼地的组合、石柱的定向展布以及空旷地、廊道和游路所体现出的特有空间结构都受到上述节理的塑造和控制。  相似文献   

双多普勒天气雷达联合探测大气风场技术进展   总被引：2，自引：4，他引：2       下载免费PDF全文

古金霞 《气象科学》2004,24(2):246-252

本文详细总结了目前国内外关于双多普勒天气雷达联合探测大气风场的技术和发展动态，阐述了双多普勒天气雷达联合探测大气风场技术方法的发展进程和几种探测方法的优缺点。从中可以了解到目前双多普勒天气雷达联合探测大气风场的最新技术——综合和连续调整技术。  相似文献   

Drillability prediction: geological influences in hard rock drill and blast tunnelling     

K. Thuro 《International Journal of Earth Sciences》1997,86(2):426-438

 Usually the main subject in preliminary site investigations prior to tunnelling projects is the prediction of tunnel stability. During the past years in conventional drill and blast tunnelling, problems have occurred also connected to the accurate prediction of drillability in hard rock. The drillability is not only decisive for the wear of tools and equipment but is – along with the drilling velocity – a standard factor for the progress of excavation works. The estimation of drillability in predicted rock conditions might bear an extensive risk of costs. Therefore, an improved prediction of drilling velocity and bit wear would be desireable. The drillability of a rock mass is determined by various geological and mechanical parameters. In this report some major correlations of specific rock properties and especially geological factors with measured bit wear and drilling velocity are shown. Drilling velocity is dependent on a lot of geological parameters: Those principal parameters include jointing of rock mass, orientation of schistosity (rock anisotropy), degree of interlocking of microstructures, porosity and quality of cementation of clastic rock, degree of hydrothermal decomposition and weathering of a rock mass. Drilling bit wear increases with the equivalent quartz content. The equivalent quartz content builds the main property for the content of wear-relevant minerals. For various groups of rock types different connections with the equivalent quartz content could be detected. In sandstone bit wear is also dependent on porosity or the quality of the cementation. Finally, an investigation program is submitted, which helps to improve the estimation of rock drillability in planning future tunnel projects. Received: 14 June 1996/Accepted: 10 January 1997  相似文献   

节理表面波纹度对其闭合性质的影响     

夏才初  孙宗颀 《工程地质学报》1995,3(2):47-53

节理的表面形貌中普遍含有波纹度。本文分析了含波纹度节理闭合模型的性质，探讨了其接触变形机理，研究了波纹度幅值、频率及不规则度方差对节理闭合性质的效应，最后与将波纹度分量作为随机分量处理的以往的节理闭合模型进行了比较。  相似文献   

水井含水层系统的潮汐响应函数          下载免费PDF全文

张昭栋  郑金涵  张广城 《地震工程学报》1995,17(3):66-71

本文考虑井孔和含水层之间相互渗流的边界条件的固体潮效应、气压效应和海潮荷载效应的理论解，得出了水井含水层系统对三种不同机理的潮汐信号响应的内在联系－水井含水层系统的潮汐响应函数，其中包括水井含水层系统的幅度响应函数和位相滞后函数。本文还讨论了两种函数与水井含水层参数之间的关系及与不排水时的情况进行了比较。  相似文献