目前Polo(Probit and Logit Analysis)软件在生物测定数据分析中的应用已得到国际上的普遍认可,为了展示Polo软件在分析农药毒力数据时的优越性,以杀虫剂对二化螟的毒力数据为例,利用Polo软件对两组毒力数据的毒力回归线的平行性和相等...目前Polo(Probit and Logit Analysis)软件在生物测定数据分析中的应用已得到国际上的普遍认可,为了展示Polo软件在分析农药毒力数据时的优越性,以杀虫剂对二化螟的毒力数据为例,利用Polo软件对两组毒力数据的毒力回归线的平行性和相等性假设进行测验,采用致死中量比率(LDR50)的95%置信限为衡量参数来检验农药毒力差异是否显著,并与传统的采用LD50值的95%置信限是否重叠来判定不同毒力间是否有差异的分析结果进行比较。结果表明,采用Polo软件对不同毒力数据进行差异分析的结果更加精确可靠,该方法可适用于比较不同药剂间的毒力、抗药性水平以及农药增效剂试验的数据分析等。展开更多
Force measurements of oscillatory flow acting on a single circular cylinder have been carried out. The experiments were done by oscillating a circular cylinder in still water. Instantaneous forces and velocity fields ...Force measurements of oscillatory flow acting on a single circular cylinder have been carried out. The experiments were done by oscillating a circular cylinder in still water. Instantaneous forces and velocity fields around the cylinder were measured by Particle Image Velocimetry (PIV). The Keulegan-Carpenter number (KC) varied in the range from 5 to 20 and the viscous parameter beta = Re / KC was set at 500 (Re is Reynolds number). It was found that the strength and frequency of the lift force increased with KC number, the main frequency of the lift force being three times the frequency of the oscillatory flow at KC = 20. The movement and strength of the vortices around the cylinder are discussed for different KC numbers.展开更多
文摘目前Polo(Probit and Logit Analysis)软件在生物测定数据分析中的应用已得到国际上的普遍认可,为了展示Polo软件在分析农药毒力数据时的优越性,以杀虫剂对二化螟的毒力数据为例,利用Polo软件对两组毒力数据的毒力回归线的平行性和相等性假设进行测验,采用致死中量比率(LDR50)的95%置信限为衡量参数来检验农药毒力差异是否显著,并与传统的采用LD50值的95%置信限是否重叠来判定不同毒力间是否有差异的分析结果进行比较。结果表明,采用Polo软件对不同毒力数据进行差异分析的结果更加精确可靠,该方法可适用于比较不同药剂间的毒力、抗药性水平以及农药增效剂试验的数据分析等。
基金National Science Foundation of China and British Council
文摘Force measurements of oscillatory flow acting on a single circular cylinder have been carried out. The experiments were done by oscillating a circular cylinder in still water. Instantaneous forces and velocity fields around the cylinder were measured by Particle Image Velocimetry (PIV). The Keulegan-Carpenter number (KC) varied in the range from 5 to 20 and the viscous parameter beta = Re / KC was set at 500 (Re is Reynolds number). It was found that the strength and frequency of the lift force increased with KC number, the main frequency of the lift force being three times the frequency of the oscillatory flow at KC = 20. The movement and strength of the vortices around the cylinder are discussed for different KC numbers.
