一类离散混沌系统的传输受限同步问题

研究了一类离散混沌系统信息受限条件下的同步问题.将具有离散形式的混沌驱动系统和具有控制输入的响应系统通过一个有限容量信道的通讯网络进行连接.在这种情况下,设计了合适的编解码方法使得传输误差在一定的条件下达到渐近稳定.同时,在线性矩阵不等式条件下,获得了同步误差方程关于传输误差是输入状态稳定,从而实现了混沌系统在信道容量有限条件下的完全同步.最后,通过Fold混沌系统验证了本文方法的有效性.     

多孔β-TCP陶瓷药物载体结构与性能的影响因素

本分析了影响多孔β-TCP陶瓷药物载体结构与性能的因素，确定了制备多孔β-TCP陶瓷药物载体的技术路线和工艺参数。     

莫来石纤维多孔陶瓷负载性能研究

用酸性偏磷酸盐作粘结剂、加压排液法成型制备了孔隙率高达96％的莫来石纤维多孔陶瓷，采用真空浸渍法，对其负载稀土复合金属氧化物La0.8Sr0.2CoO3的性能进行了研究，考察了浸渍时间、浸渍次数对负载量的影响，得出最佳浸渍时间为60min，浸渍次数为2次。通过扫描电镜(SEM)表征了内部架构，最后指出莫来石纤维多孔陶瓷有望成为具有较好效果的新型催化剂载体。     

自升式海洋平台多桩腿同步控制的研究

该文针对多电机同步控制系统的参数时变、非线性以及容易受负载扰动等因素,提出了基于相邻交叉耦合结构的BP神经网络PID控制算法,在Mathb/Simulink环境下搭建了多电机同步控制系统仿真模型.为实现自升式海洋平台升降过程的同步控制,在自升式海洋平台升降控制系统中引入了基于相邻交叉耦合结构的BP神经网络PID控制算法,经试运行表明,海洋平台升降过程中,同步性能好、系统可靠性高、结构简单、完全能够满足海洋平台的平稳升降要求.     

靶向壳聚糖基因载体与水溶性量子点的自组装

将透明质酸(HA)接枝到四种不同分子量的壳聚糖(CS)上,获得了靶向壳聚糖基因载体。将CS及接枝CS分别与水溶性量子点(QDs)自组装,研究发现,相对于纯QDs,CS/QDs复合物及接枝CS/QDs复合物的荧光强度均明显增强,荧光发射峰位发生红移。复合物呈核/壳结构,QDs被包裹在核内。和CS/QDs复合物相比,接枝CS/QDs复合物的尺寸更小,分布更为均一。     

ZrO2载体催化剂的制作及特性探讨

选择有应用价值的CuO/ZrO2体系，通过大量试验寻找到了一种以ZrO2为载体的高比表面催化剂的制备方法。     

On Designing Time‐delay Feedback Controller for Master‐Slave Synchronization of Lur'e Systems

This paper is concerned with the problem of designing a time‐delay output feedback controller for master‐slave synchronization of Lur'e systems. The time delay is divided into two intervals and different energy functions are defined in each interval, which together provide a new Lyapunov–Krasovskii functional and derive a new delay‐dependent synchronization criterion. A sufficient condition for the existence of such a feedback controller is given, and an explicit expression of such a controller is also achieved. These algorithms are formulated in terms of linear matrix inequalities that can be solved easily. Chua's circuit is used to illustrate the effectiveness of the design method.     

An Active Disturbance Rejection Approach to Leader‐Follower Controlled Formation

This article describes the design of a linearizing, observer‐based, robust dynamic feedback control scheme for output reference trajectory tracking tasks in a leader‐follower non‐holonomic car formation problem. The approach is based on the cars' kinematic models. A radical simplification in the form of a global ultra‐model is proposed on the follower's exact open loop position tracking error dynamics obtained via flatness considerations. This results in a system described by an additively disturbed set of two, second order integrators with non‐linear velocity dependent control input gain matrix. The unknown additive disturbances are modeled as absolutely uniformly bounded time signals which may be locally approximated by arbitrary elements of a sufficiently high degree family of Taylor polynomials. Linear high‐gain Luenberger observers of the generalized proportional integral (GPI) type may be readily designed. These observers include the self updating internal model of the unknown disturbance input vector components in the form of generic, instantaneous, time‐polynomial models. The proposed (GPI) observers, which are the dual counterpart of GPI controllers [17], achieve a simultaneous disturbance estimation and tracking error phase variables estimation. This on‐line gathered information is used to advantage on the follower's feedback controller thus allowing for a simple, yet efficient, disturbance and control input gain cancelation effort. The results are applied to have the follower track a time‐delayed version of the actual leader's trajectory. Experimental results are presented which illustrate the robustness and viability of the proposed approach.