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本文深入地介绍了上海市规划和国土资源信息化建设中软件质量管理的发展历程和现状,总结了如何推进和实施软件质量管理的主要想法和做法,并且阐述了软件质量管理实施过程中的问题、解决办法和取得的成效。 相似文献
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The popularly used viscoelastic models have some shortcomings in describing relationship between quality factor (Q) and frequency, which is not consistent with the observation data. Based on the theory of viscoelasticity, a new approach to construct constant-Q viscoelastic model in given frequency band with three parameters is developed. The designed model describes the frequency-independence feature of quality factor very well, and the effect of viscoelasticity on seismic wave field can be studied relatively accurate in theory with this model. Furthermore, the number of required parameters in this model has been reduced fewer than that of other constant-Q models, this can simplify the solution of the viscoelastic problems to some extent. At last, the accuracy and application range have been analyzed through numerical tests. The effect of viscoelasticity on wave propagation has been briefly illus-trated through the change of frequency spectra and waveform in several different viscoelastic models. 相似文献
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在前人构建的陆面水文过程模型TOPX和区域气候模式RIEMS的耦合模式的框架基础上,针对耦合模式中RIEMS对降水和蒸散发的模拟精度较低,RIEMS和TOPX模式之间尺度不匹配等进行研究,结果如下:(1)多普勒雷达资料的定量估测降水方面。首先,获取研究区最佳的雷达反射率-雨强(Z-I)关系。选择改进 相似文献
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引言
2011年3月11日日本本州岛东海岸附近海域发生的M9.0地震(Tohoku earthquake,以下称“东日本大地震”——译者注)及其引发的海啸造成数以万计的人员死亡,造成的财产损失可能超过1万亿美元,这是有历史记录以来最严重的自然灾害之一。 相似文献
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To help in ascertaining methane content of lignite reservoir in China,the isothermal ad-sorption measurements of methane have been performed on moisture-equilibrated coals of some typical lignite-bearing basins,which comprise maximum reflectance of vitrinite(Ro,max) ranging from 0.24% to 0.50%.Related to other coal properties,our analysis shows that methane adsorption of lignite is mainly affected by coalification,as well as by maceral composition,moisture content,and seam temperature.Maximum methane capaci... 相似文献