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321.
基于空间语义学基础理论,将传统的地理信息服务技术与新兴的语义服务技术相结合,建立地理信息语义服务框架及知识标注方法体系,并应用于地理空间信息服务处理中,提供智能化、自动化的地理信息服务发现、组合与触发策略;设计基于文本挖掘算法的半自动知识标注引擎,提高服务处理自动化程度,实现包含丰富语义信息的地理空间语义服务的发布;建立基于规则和推理引擎的地理信息服务匹配与发现机制,提高服务发现效率;建立地理信息服务语义标注与服务匹配评价方法,采用基于空间关联规则的标注正确性评估策略,验证知识标注价值。 相似文献
322.
董刚 《地震工程与工程振动(英文版)》2002,1(1):20-26
Objectives of this task are to conduct research on seismic hazards, and to provide relevant input on the expected levels of
these hazards to other tasks. Other tasks requiring this input include those dealing with inventory, fragility curves, rehabilitation
strategies and demonstration projects. The corresponding input is provided in various formats depending on the intended use:
as peak ground motion parameters and/or response spectral values for a given magnitude, epicentral distance and site conditions;
or as time histories for scenario earthquakes that are selected based on the disaggregated seismic hazard mapped by the U.S.
Geological Survey and are incorporated in building codes. The user community for this research is both academic researchers
and practicing engineers who may use the seismic input generated by the synthesis techniques that are developed under this
task for a variety of applications. These include ground motions for scenario earthquakes, for developing fragility curves
and in specifying ground motion input for critical facilities (such as hospitals) located in the eastern U.S.
Supported in part by the Earthquake Engineering Research Centers Program of the National Science Foundation under Award Number EEC-9701471
to the Multidisciplinary Center for Earthquake Engineering Research. 相似文献
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324.
A simple diagnostic simulation of the annual cycling of the surface specific photosynthesis rate (SPR) in Jiaazhou Bay is described in this paper. Light intensity, temperature and nutrients(nitrate ammonia, phosphate) were considered as main factors controlling photosynthesis of phytoplankton and were introduced into the model by different function equations. The simulated variation ofspecific photosynthesis rate coincided with the measured data. Analysis of the effect of every factor onphotosynthesis indicated that the variation of photosynthesis rate was controlled by all these three factors,while temperature showed good correlation with SPR as measurement showed. This diagnostic simulationyielded the values of some parameter relating with the photosynthesis in Jiaozhou Bay. 相似文献
325.
GLACIER MELTWATER RUNOFF IN CHINA AND ITS NOURISHMENT TO RIVER 总被引:3,自引:0,他引:3
杨针娘 《中国地理科学(英文版)》1995,5(1):66-76
GLACIERMELTWATERRUNOFFINCHINAANDITSNOURISHMENTTORIVER¥YangZhenniang(杨针娘)(LanzhouInstituteofGlaciologyandGeocryology,theChines... 相似文献
326.
This paper presents a new application of the cokriging technique for constructing maps of aquifer transmissivity from field measurements of transmissivity and specific capacity. The technique is illustrated using data from Yolo Basin, California. Cokriging is well-suited for estimating undersampled variables. To improve the accuracy of the estimation, cokriging considers the spatial auto-correlation of the variable to be estimated and the spatial cross-correlation between the variable to be estimated and other, better-sampled variables. Consequently, in regions that lack data of the variable to be estimated, accurate estimation can still be made on the basis of auto- and cross-correlation. In addition, estimation variances can be obtained with a little additional computation effort. 相似文献
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329.
The Tournemire underground laboratory is situated in a clay formation and consists of a disaffected railway tunnel and two perpendicular drifts. The paper presents modelling and 3D simulations of the hydraulic behaviour of the argillaceous formation around the works. Experimental measurements of porosity, permeability and specific storage coefficients allowed us to model the hydraulic properties of the shale. Numerical simulations are performed with the code CASTEM. Numerical results of hydraulic heads are compared to experimental measurements. Calculations show that the excavation of the tunnel and drifts has induced an hydraulic decompression of the indurated argillaceous formations. The zones of decompression are centred around the structures and extend depending on the values of hydraulic parameters such as permeability and specific storage selected in the model. Six years after the excavation of the drifts, the hydraulic steady state in the fractured zone is not yet reached. 相似文献
330.
利用航磁资料和三维磁性层反演理论,对菏泽震区的航磁资料进行了数据处理,计算出震区枧磁化强度分布图、基底磁性界面埋深图和居里等温面埋深图。结果显示东濮凹陷基底磁性界面深达12km,下部居里等温面上隆,凹陷内被弱磁性物质填充。地震发生在凹陷附近视磁化强度、基底磁性界面、居里等温面的变异带上。 相似文献