为改善3年生嘉宝果(Myrciaria cauliflora Berg)的栽培基质并促进其生长和发育,通过田间盆栽试验研究了有机碳对其实生苗地上部生长量和叶绿素含量的影响。结果表明:有机碳对嘉宝果实生苗地上部生长量和叶绿素含量均有一定的促进作用,...为改善3年生嘉宝果(Myrciaria cauliflora Berg)的栽培基质并促进其生长和发育,通过田间盆栽试验研究了有机碳对其实生苗地上部生长量和叶绿素含量的影响。结果表明:有机碳对嘉宝果实生苗地上部生长量和叶绿素含量均有一定的促进作用,以每盆150 m L有机碳效果最为显著。生产中将有机碳剂量控制在每盆100~200 m L对改良嘉宝果生长的土壤基质最为适宜,能有效促进其生长发育。展开更多
Although it has been shown that the implementation of the HHT-α method can result in improved error propagation properties in pseudodynamic testing if the equation of motion is used instead of the difference equation...Although it has been shown that the implementation of the HHT-α method can result in improved error propagation properties in pseudodynamic testing if the equation of motion is used instead of the difference equation to evaluate the next step acceleration, this paper proves that this method might lead to instability when used to solve a nonlinear system. Its unconditional stability is verified only for linear elastic systems, while for nonlinear systems, instability occurs as the step degree of convergence is less than 1. It is worth noting that the step degree of convergence can frequently be less than 1 in pseudodynamic testing, since a convergent solution is achieved only when the step degree of convergence is close to 1 regardless of whether its value is greater or less than 1. Therefore, the application of this scheme to pseudodynamic testing should be prohibited, since the possibility of instability might incorrectly destroy a specimen. Consequently, the implementation of the HHT-α method by using the difference equation to determine the next step acceleration is recommended for use in pseudodynamic testing.展开更多
文摘为改善3年生嘉宝果(Myrciaria cauliflora Berg)的栽培基质并促进其生长和发育,通过田间盆栽试验研究了有机碳对其实生苗地上部生长量和叶绿素含量的影响。结果表明:有机碳对嘉宝果实生苗地上部生长量和叶绿素含量均有一定的促进作用,以每盆150 m L有机碳效果最为显著。生产中将有机碳剂量控制在每盆100~200 m L对改良嘉宝果生长的土壤基质最为适宜,能有效促进其生长发育。
基金Science Council of Chinese Taipei Under Grant No. NSC-94-2211-E-027-011
文摘Although it has been shown that the implementation of the HHT-α method can result in improved error propagation properties in pseudodynamic testing if the equation of motion is used instead of the difference equation to evaluate the next step acceleration, this paper proves that this method might lead to instability when used to solve a nonlinear system. Its unconditional stability is verified only for linear elastic systems, while for nonlinear systems, instability occurs as the step degree of convergence is less than 1. It is worth noting that the step degree of convergence can frequently be less than 1 in pseudodynamic testing, since a convergent solution is achieved only when the step degree of convergence is close to 1 regardless of whether its value is greater or less than 1. Therefore, the application of this scheme to pseudodynamic testing should be prohibited, since the possibility of instability might incorrectly destroy a specimen. Consequently, the implementation of the HHT-α method by using the difference equation to determine the next step acceleration is recommended for use in pseudodynamic testing.
