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991.
童俊 《安庆师范学院学报(自然科学版)》2001,7(3):102-103
对分析仪器的合格性验证与性能校验的过程、方法进行综述 ,同时对购买仪器提出参考意见。 相似文献
992.
研究了油松花粉对雄性幼年小白鼠睾丸发育及精子生成的影响.并与睾酮组和正常对照组进行了比较.结果表明:油松花粉具有类似睾酮的作用,可促进睾丸的发育及精子的生成,油松花粉作为营养保健品开发,儿童不宜服用。 相似文献
993.
苯胺与聚硫橡胶原位电化学复合的性质 总被引:1,自引:1,他引:0
讨论了苯胺与聚硫橡胶电聚合时的相互作用,结果表明,聚苯胺与聚硫橡胶之间具有互相催化作用,且随着复合膜厚度的增加催化活性增高;同时还可提高聚硫橡胶电氧化还原的可逆性 相似文献
994.
提出的选择原则是将电机特性与负载特性分离开,并用图解的形式表示,这种表示方法使得驱动装置的可行性检查和不同系统间的比较更方便,另外,还提供了传动比的一个可能范围。 相似文献
995.
It has been found that high-order deformation (e.g.β6) can have important effects on the structures of superheavy nuclei. In the present work, we investigate octupole deformation effects on superheavy nuclei with an improved potential-energy-surface (PES) calculation by including reflection-asymmetric deformations in a space of (β2 ,β3 ,β4 , β5). The calculations give various deformations including highly deformed (β2 ≈ 0.4) and superdeformed (β2 ≈ 0.7) shapes. The octupole-deformation degree of freedom mainly affects the fission barrier beyond the second minimum of PES. 相似文献
996.
<正> In this paper,a two-scale finite element approach is proposed and analyzed for approximationsof Green's function in three-dimensions.This approach is based on a two-scale finite elementspace defined,respectively,on the whole domain with size H and on some subdomain containing singularpoints with size h (h H).It is shown that this two-scale discretization approach is very efficient.In particular,the two-scale discretization approach is applied to solve Poisson-Boltzmann equationssuccessfully. 相似文献
997.
In order to develop an efficient identification method for Fallopia plants and drugs, molecular analysis of the partial matK gene sequences was performed on 6 Fallopia species. Based on the matK sequences, a phylogenetic tree was constructed, which showed that different populations of inter- and intra-species could
be specified and distinguished. The matK gene sequences of the 6 Fallopia species were all found to be of 1 271 bp in length, with some nucleotide variations throughout the entire sequences. The
nucleotide difference at position 1 041 could distinguish F. denticulata from others, while specific nucleotide at position 1 154 became identification markers for F. aubertii. Moreover, four specific marker sites for F. multiflora var. ciliinerve at positions 216, 224, 1 060 and 1 179, seven for F. convolvulus at 318, 765, 772, 874, 936, 952 and 1 036, and seven for F. dentate alata at 111, 192, 366, 450, 457, 1 032 and 1 074 were also observed. By detecting the marker nucleotides and analyzing the phylogenetic
relationship, the botanical origins of five inspected drugs were determined, suggesting that matK sequences can be used for authenticating Fallopia plants and drugs. 相似文献
998.
999.
A new watermarking algorithm resisting to geometric transformation based on singular value decomposition(SVD) in logarithm polar coordinate is proposed.The log-polar mapping(LPM) is used to resist rotation and scaling attacks,and the odd-even quantization algorithm is used to embed watermark so it can be extracted without the original host image.The experiments show that the proposed algorithm not only resists various geometric attacks but also is robust enough to the common signal processing. 相似文献
1000.
The process of 180° domain switching in PbTiO3 single crystal under an antiparallel electric field was investigated by the three-dimensional phase field simulation, especially
the effect of electric field on the type and duration of domain switching. It is found that the polarization reversal of domains
takes place under an antiparallel electric field in PbTiO3 single crystal. The results of the phase field simulation indicate that there is only 90° domain switching under a weak electric
field. With the rise of the electric field, 180° domain switching appears. If the electric field is strengthened further,
90° domain switching disappears and the duration of domain switching is shortened. 相似文献