共查询到5条相似文献，搜索用时 15 毫秒
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《The Professional geographer》2013,65(2):147-151
This work examines the use of an annually updated metropolitan data system as a tool for evaluating benign racial location policies during the first year of the Section 8 Existing Rent Supplement program. Case-study evidence shows that the rent supplement program (with benign locational policies) is ineffective in reducing the isolation faced by minority groups, and that the information used to monitor compliance of the program with benign locational policies lags badly behind the true state of affairs. As a result, new areas of racial concentration have been encouraged and augmented. 相似文献
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湖北省降水量的周期分析 总被引：8，自引：0，他引：8
结合降水量对农业生产的影响特点将全年降水量分成５个阶段,根据聚类分析的结果将不同的时段的降水量进行分区,由此对全省的降水量做自相关分析和功率谱分析,从而发现了降水量的变化周期。 相似文献
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Avijit Ghosh 《The Professional geographer》1981,33(4):475-483
The spatiotemporal pattern of periodic market places depends upon the function of the marketing system in a region. Market places that facilitate local exchange would be located differently from those that facilitate interregional trade or provide urban goods to rural areas. The effects of changes in transport infrastructure and consumer behavior on market location patterns also depend upon the organization of the marketing system. The process of market organization implicit in the “consumer hypothesis'’is in contradiction with the theoretical models of periodic markets. 相似文献
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东南沿海地区旱涝气侯准周期振荡特征及其变化趋势 总被引：1，自引：0，他引：1
本文提出干旱指数与洪涝指数二分序列，讨论了东南沿海地区1470～1993年时间序列上旱、涝气候准周期振荡特征．结果表明，旱的周期振动与涝的周期振动存在着差异，在不同的时间尺度上都有所反映，作周期分析时有必要分别寻求旱与涝各自的周期振动分量．结果还表明，太阳活动11年周期，22年磁周期和日月地相对运动19年周期，都与该区旱涝长期变化存在着较强的统计对应关系，并且太阳活动强弱世纪周期对其长期变化也有一定的影响。 相似文献