By using PEG 1500 glass chromatography column, 9 kinds of bactericidal substances (\%m\%\|hydroxybenzoic acid, methyl salicylate, catechol, acetic acid, acetaldehyde, acrylic acid, diethyl sulphide, borneol\|2 and cam...By using PEG 1500 glass chromatography column, 9 kinds of bactericidal substances (\%m\%\|hydroxybenzoic acid, methyl salicylate, catechol, acetic acid, acetaldehyde, acrylic acid, diethyl sulphide, borneol\|2 and camphanone\|2) and 9 kinds of aromatic substances (ethyl acetoacetate, allyl alcohol, citral, acetylmethylcarbinol, iso\|pentanol, borneol\|2, ethyl acetate, benzaldehyde and terpineol) were extracted out through the separation experiments on the volatile gas released from 12 main greenery tree species in Shanghai. Furthermore, the hygienical substances ingredient proportion between the different trees was measured. This experiment provides scientific basis for constructing healthy ecological greenland.展开更多
提出了一种图像编码算法ESPIHT(extended set partitioning in hierarchical trees).该算法能够通过以下3项措施提高SPIHT算法工作效率:(1) 全面引入快速提升小波变换;(2) 重新定义扩充零树结构;(3) 综合考虑人眼视觉特性.实验结果表明,...提出了一种图像编码算法ESPIHT(extended set partitioning in hierarchical trees).该算法能够通过以下3项措施提高SPIHT算法工作效率:(1) 全面引入快速提升小波变换;(2) 重新定义扩充零树结构;(3) 综合考虑人眼视觉特性.实验结果表明, ESPIHT算法是一种高效的图像压缩算法,其编解码速度、图像复原质量、内存需求量等关键技术指标均优于SPIHT等编码算法(特别是在低比特率下).展开更多
文摘By using PEG 1500 glass chromatography column, 9 kinds of bactericidal substances (\%m\%\|hydroxybenzoic acid, methyl salicylate, catechol, acetic acid, acetaldehyde, acrylic acid, diethyl sulphide, borneol\|2 and camphanone\|2) and 9 kinds of aromatic substances (ethyl acetoacetate, allyl alcohol, citral, acetylmethylcarbinol, iso\|pentanol, borneol\|2, ethyl acetate, benzaldehyde and terpineol) were extracted out through the separation experiments on the volatile gas released from 12 main greenery tree species in Shanghai. Furthermore, the hygienical substances ingredient proportion between the different trees was measured. This experiment provides scientific basis for constructing healthy ecological greenland.
文摘提出了一种图像编码算法ESPIHT(extended set partitioning in hierarchical trees).该算法能够通过以下3项措施提高SPIHT算法工作效率:(1) 全面引入快速提升小波变换;(2) 重新定义扩充零树结构;(3) 综合考虑人眼视觉特性.实验结果表明, ESPIHT算法是一种高效的图像压缩算法,其编解码速度、图像复原质量、内存需求量等关键技术指标均优于SPIHT等编码算法(特别是在低比特率下).
