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<正>在143团6连、7连、良繁连种植脱毒马铃薯1700余亩,种植期间发现了马铃薯早疫病、黑胫病等病害;而在较为冷凉的151团种植的马铃薯上发现 相似文献
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潘金莲浅论 总被引:1,自引:0,他引:1
万刚 《江西科技师范学院学报》1997,(3)
潘金莲浅论万刚《金瓶梅》中的潘金莲,她的名字的意译是“金色莲花”。“金色莲花”,多么美好的名字,这朵“莲花”,从她一露出水面便亭亭玉立,惹人喜爱,但随着苦雨淫风的浇淋、侵蚀,这朵美丽的“莲花”,周身长满了毒瘤,渐渐失去了原有的风采,直至凋零、枯萎、死... 相似文献
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Geography requires a comprehensive understanding of both natural and human factors,as well as their interactions.Due to the complexity and multiplicity of geographic problems,various theories and methods for geographic modelling and simulation have been proposed.Currently,geography has entered an era in which quantitative analysis and modelling are essential for understanding the mechanisms of geographic processes.As the basic idea of quantitative spatial analysis,the specified space often needs to be partitioned by a series of small computational units(cells),i.e.,grids.Thus,there is a close relationship between the grids and geographic modelling.This article reviews the mainstream and typical grids used for modelling and simulation.In addition to classification,the derived theories and technologies,including grid generation methods,data organization strategies,multi-dimensional querying methods,and grid adaptation techniques,are discussed.For integrated geographic simulation to explore comprehensive geographic problems,we argued that it is reasonable to build bridges among different types of grids(e.g.,transformation strategies),and more powerful grids that can support multi-type of numerical computation are urgently needed. 相似文献
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一种改进的低信噪比GPS信号捕获算法 总被引:1,自引:0,他引:1
为解决传统非相干累加算法难以克服的数据比特反转与平方损失问题,针对低信噪比GPS信号C/A码捕获,研究一种基于相干结果差分共轭乘累加的检测统计方法,实现了相干累加时间的延拓与增益的提高.仿真实验结果表明:在同等条件下捕获-175 dBW信号时,该算法性能明显优于非相干累加算法,可获得约2 dB增益. 相似文献
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