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不同海拔地区施氮量、密度、采叶数对烤烟产质量的影响 被引量:8
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作者 厉福强 胡德才 +8 位作者 王蓉 杨友成 曾忠旭 冯光群 何文彪3杨先才 徐德富 陈叶君 王贵生 简在云 《贵州农业科学》 CAS 2000年第S1期38-41,共4页
通过4 年在不同地区、不同海拔高度(为800 m ,1 000 m ,1 200 m )、不同施氮量(分别为4.5 kg/667m 2,5.5 kg/667m 2,6.5 kg/667m 2)条件下,对K326 和贵烟11 号两品种... 通过4 年在不同地区、不同海拔高度(为800 m ,1 000 m ,1 200 m )、不同施氮量(分别为4.5 kg/667m 2,5.5 kg/667m 2,6.5 kg/667m 2)条件下,对K326 和贵烟11 号两品种进行了3 种密度与采叶数组合(为1 000×21,1 200×17,1 400×13)的试验。其结果是3 个不同地区、3 个海拔高度及对应的施氮水平都以K326 为1 000×21 和1 200×17、贵烟11 号为1 000×21 和1 400×13 表现为好,各年各点试验烟叶的化学成分及品质正常。 展开更多
关键词 烤烟 密度 采叶数 产质量
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The Use of Data Mining Techniques in Rockburst Risk Assessment 被引量:9
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作者 Luis Ribeiro e Sousa Tiago Miranda +1 位作者 Rita Leal e Sousa Joaquim Tinoco 《Engineering》 SCIE EI 2017年第4期552-558,共7页
Rockburst is an important phenomenon that has affected many deep underground mines around the world. An understanding of this phenomenon is relevant to the management of such events, which can lead to saving both cost... Rockburst is an important phenomenon that has affected many deep underground mines around the world. An understanding of this phenomenon is relevant to the management of such events, which can lead to saving both costs and lives. Laboratory experiments are one way to obtain a deeper and better understanding of the mechanisms of rockburst. In a previous study by these authors, a database of rockburst laboratory tests was created; in addition, with the use of data mining (DM) techniques, models to predict rockburst maximum stress and rockburst risk indexes were developed. In this paper, we focus on the analysis of a database of in situ cases of rockburst in order to build influence diagrams, list the factors that interact in the occurrence of rockburst, and understand the relationships between these factors. The in situ rockburst database was further analyzed using different DM techniques ranging from artificial neural networks (ANNs) to naive Bayesian classifiers. The aim was to predict the type of rockburst-that is, the rockburst level-based on geologic and construction characteristics of the mine or tunnel. Conclusions are drawn at the end of the paper. 展开更多
关键词 Rockburst Data mining Bayesian networks In situ database
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Convergence of Riemannian sums of inverse wavelet transforms 被引量:1
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作者 SUN XuDong SUN WenChang 《Science China Mathematics》 SCIE 2011年第4期681-698,共18页
We study the approximation of the inverse wavelet transform using Riemannian sums.We show that when the Fourier transforms of wavelet functions satisfy some moderate decay condition,the Riemannian sums converge to the... We study the approximation of the inverse wavelet transform using Riemannian sums.We show that when the Fourier transforms of wavelet functions satisfy some moderate decay condition,the Riemannian sums converge to the function to be reconstructed as the sampling density tends to infinity.We also study the convergence of the operators introduced by the Riemannian sums.Our result improves some known ones. 展开更多
关键词 wavelet frames wavelet transforms Riemannian sums
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