研究了自主水下航行器(AUV)的路径跟踪问题,将跟踪控制问题分为导引和控制2部分。导引部分基于视线导引(Line of Sight)原理输出AUV的参考航向,针对AUV的参数不确定性及海流干扰等特点,航向控制器采用变结构控制律计算舵角控制输入,在...研究了自主水下航行器(AUV)的路径跟踪问题,将跟踪控制问题分为导引和控制2部分。导引部分基于视线导引(Line of Sight)原理输出AUV的参考航向,针对AUV的参数不确定性及海流干扰等特点,航向控制器采用变结构控制律计算舵角控制输入,在此基础上,将航向控制器与路径跟踪控制器并行结合,构造了文中提出的混合型路径跟踪控制器。文章从理论上证明了控制律的稳定性,仿真结果表明,所设计的控制律可以保证AUV沿期望路径航行,路径跟踪误差快速收敛。展开更多
WU polyomavirus,which was firstly discovered in 2007,is a new human polyomavirus belonging to Polyomaviridae and containing circular double-stranded genomic DNA.In this study,the 278 clinical sputum specimens from chi...WU polyomavirus,which was firstly discovered in 2007,is a new human polyomavirus belonging to Polyomaviridae and containing circular double-stranded genomic DNA.In this study,the 278 clinical sputum specimens from children under 5 years old were collected from Wenzhou Medical College affiliated Wenling First Hospital,Zhejiang Province.Based on identification assay of WU polyomavirus previously reported,a WU polyomavirus was identified from clinical samples successfully,the positive rate was 0.4%.The sequences of PCR products were identical to that of VP2 gene and large T antigen gene derived from WU polyomavirus reported.The above results strongly suggested that the WU polyomavirus isolated was firstly found in Chinese children with acute lower respiratory tract infections.This study provides a firm basis for further research of WU polyomavirus.展开更多
KI polyomavirus,which was firstly discovered in 2007,is a new human polyomavirus belonging to Polyomaviridae and containing circular double-strand genomic DNA.This study was based on identification assay of KI polyoma...KI polyomavirus,which was firstly discovered in 2007,is a new human polyomavirus belonging to Polyomaviridae and containing circular double-strand genomic DNA.This study was based on identification assay of KI polyomavirus reported.Total 2293 clinical sputum specimens from children under 3 years old were collected and screened from Wenzhou Medical College affiliated Wenling Hospital,Zhejiang Province.A KI polyomavirus was detected and identified,the positive rate was 0.04%.The sequences of PCR products was identical to that of the viral capsid protein(VP1) gene derived from KI polyomavirus.The results strongly suggested that the KI polyomavirus was found firstly in Chinese children with acute lower respiratory tract infections from Zhejiang region.This study provided new information for further investigation of etiopathogenisis and diagnosis in children with lower respiratory tract infections.展开更多
文摘研究了自主水下航行器(AUV)的路径跟踪问题,将跟踪控制问题分为导引和控制2部分。导引部分基于视线导引(Line of Sight)原理输出AUV的参考航向,针对AUV的参数不确定性及海流干扰等特点,航向控制器采用变结构控制律计算舵角控制输入,在此基础上,将航向控制器与路径跟踪控制器并行结合,构造了文中提出的混合型路径跟踪控制器。文章从理论上证明了控制律的稳定性,仿真结果表明,所设计的控制律可以保证AUV沿期望路径航行,路径跟踪误差快速收敛。
文摘WU polyomavirus,which was firstly discovered in 2007,is a new human polyomavirus belonging to Polyomaviridae and containing circular double-stranded genomic DNA.In this study,the 278 clinical sputum specimens from children under 5 years old were collected from Wenzhou Medical College affiliated Wenling First Hospital,Zhejiang Province.Based on identification assay of WU polyomavirus previously reported,a WU polyomavirus was identified from clinical samples successfully,the positive rate was 0.4%.The sequences of PCR products were identical to that of VP2 gene and large T antigen gene derived from WU polyomavirus reported.The above results strongly suggested that the WU polyomavirus isolated was firstly found in Chinese children with acute lower respiratory tract infections.This study provides a firm basis for further research of WU polyomavirus.
文摘KI polyomavirus,which was firstly discovered in 2007,is a new human polyomavirus belonging to Polyomaviridae and containing circular double-strand genomic DNA.This study was based on identification assay of KI polyomavirus reported.Total 2293 clinical sputum specimens from children under 3 years old were collected and screened from Wenzhou Medical College affiliated Wenling Hospital,Zhejiang Province.A KI polyomavirus was detected and identified,the positive rate was 0.04%.The sequences of PCR products was identical to that of the viral capsid protein(VP1) gene derived from KI polyomavirus.The results strongly suggested that the KI polyomavirus was found firstly in Chinese children with acute lower respiratory tract infections from Zhejiang region.This study provided new information for further investigation of etiopathogenisis and diagnosis in children with lower respiratory tract infections.
