随着服务计算技术的发展及应用,在服务实时组合过程中,服务质量(Quality of Service,QoS)已经成为选择服务的重要依据之一。当前较多的QoS动态计算方法提出了多种方案用以解决QoS的动态计算问题,但都将Web服务视为单一独立个体,首先通...随着服务计算技术的发展及应用,在服务实时组合过程中,服务质量(Quality of Service,QoS)已经成为选择服务的重要依据之一。当前较多的QoS动态计算方法提出了多种方案用以解决QoS的动态计算问题,但都将Web服务视为单一独立个体,首先通过获取独立的参数来测算每个Web服务的QoS,然后在服务组合过程中按照功能需求从具有相同功能的待选服务集合中选取QoS最好的服务。为了避免不同服务的功能差异对计算QoS的影响,突出相同功能服务各QoS因素之间的关联性对计算QoS的影响,从而在相同功能的服务中选取出相对质量较好的服务,文中提出将Web服务群体按照功能分组,在组内实时、动态地计算各服务QoS的方法,实验表明,文中方法计算得到的QoS具有较好的可靠性和较高的可信度。展开更多
The effects of ultradry storage on the activity of ATPase and fluidity of plasma membrane in Chinese cabbage (Brassica pekinensis (Lour.) Rupr.) and elm ( Ulmus pumila L.) seeds were investigated. The results indicate...The effects of ultradry storage on the activity of ATPase and fluidity of plasma membrane in Chinese cabbage (Brassica pekinensis (Lour.) Rupr.) and elm ( Ulmus pumila L.) seeds were investigated. The results indicated that no significant differences in the activity of ATPase and the micro- viscosity of plasma membrane of ultradried (UD) seeds could be found as compared to the control seeds stored under -20 degreesC, although there was a little adverse effect on the seeds with extreme dehydration. The results were consistent with higher vigor level of UD seeds. This implied that ultradry seed storage could protect the integrity of the membrane, maintain its physiological function and improve the storability of seeds. The relationship between sugar and desiccation tolerance of UD seeds was analysed using the HPLC. The results showed that the ratio of reducing to nonreducing sugar was lower in UD seeds than that in control. The content of sucrose and stachyose in elm and Chinese cabbage UD seeds was related to their desiccation tolerance, while no stachyose was detected in corn (Zea mays L.) seeds. This could be one of the reasons for its sensitivity to desiccation.展开更多
文摘随着服务计算技术的发展及应用,在服务实时组合过程中,服务质量(Quality of Service,QoS)已经成为选择服务的重要依据之一。当前较多的QoS动态计算方法提出了多种方案用以解决QoS的动态计算问题,但都将Web服务视为单一独立个体,首先通过获取独立的参数来测算每个Web服务的QoS,然后在服务组合过程中按照功能需求从具有相同功能的待选服务集合中选取QoS最好的服务。为了避免不同服务的功能差异对计算QoS的影响,突出相同功能服务各QoS因素之间的关联性对计算QoS的影响,从而在相同功能的服务中选取出相对质量较好的服务,文中提出将Web服务群体按照功能分组,在组内实时、动态地计算各服务QoS的方法,实验表明,文中方法计算得到的QoS具有较好的可靠性和较高的可信度。
文摘The effects of ultradry storage on the activity of ATPase and fluidity of plasma membrane in Chinese cabbage (Brassica pekinensis (Lour.) Rupr.) and elm ( Ulmus pumila L.) seeds were investigated. The results indicated that no significant differences in the activity of ATPase and the micro- viscosity of plasma membrane of ultradried (UD) seeds could be found as compared to the control seeds stored under -20 degreesC, although there was a little adverse effect on the seeds with extreme dehydration. The results were consistent with higher vigor level of UD seeds. This implied that ultradry seed storage could protect the integrity of the membrane, maintain its physiological function and improve the storability of seeds. The relationship between sugar and desiccation tolerance of UD seeds was analysed using the HPLC. The results showed that the ratio of reducing to nonreducing sugar was lower in UD seeds than that in control. The content of sucrose and stachyose in elm and Chinese cabbage UD seeds was related to their desiccation tolerance, while no stachyose was detected in corn (Zea mays L.) seeds. This could be one of the reasons for its sensitivity to desiccation.
