Learn More
In this paper, we consider the leader-following consensus problem for multiple uncertain rigid spacecraft systems with the attitude being represented by unit quaternion. Existing results on this problem rely on the assumption that all parameters of the rigid spacecraft system are known exactly. By employing a nonlinear distributed observer for the leader(More)
The leader-following consensus problem of multiple uncertain Euler-Lagrange systems under switching network topology was studied using the distributed observer approach in one of our recent papers. However, the distributed observer in that paper assumed that all the followers knew the system matrix of the leader system. In this paper, we first propose a(More)
A novel highly birefringent photonic crystal fiber (PCF) based on an octagonal structures with isosceles triangular-latticed cladding is proposed. Using a full-vector finite element method (FEM) simulator (COMSOL Multiphysics), we study the modal birefringence of the fundamental modes with different parameters in such PCFs. In addition, the proposed(More)
AIM To investigate the diagnostic performance of liver stiffness measurement (LSM) by elastography point quantification (ElastPQ) in animal models and determine the longitudinal changes in liver stiffness by ElastPQ after splenectomy at different stages of fibrosis. METHODS Liver stiffness was measured in sixty-eight rabbits with CCl4-induced liver(More)