Delay-dependent state feedback robust stabilization for uncertain singular time-delay systems

The problem of robust stabilization for uncertain singular time-delay systems is studied. First, a new delay-dependent asymptotic stability criteria for normal singular time-delay systems is given, which is less conservative. Using this result, the problem of state feedback robust stabilization for uncertain singular time-delay systems is discussed, Finally, two examples are given to illustrate the effectiveness of the results.     

Recent progress on space-borne microwave sounder pre-launchcalibration technologies in China

The development processes and the application achievements of space-borne microwave sounder pre-launch calibration technologies in China are introduced briefly. Then, the general project plan for pre-launch calibration, the latest research achievements on the optimization and development of the microwave wide band calibration targets, emissivity measurement technologies and the system level uncertainty analysis of the laboratory, and the thermal/vacuum microwave sounder calibration system for ＂FY-3＂ meteorological satellite are reported, respectively. Finally, the key technological problems of the calibration technologies under researching are analyzed predictively.     

Trajectory linearization control of an aerospace vehicle based on RBF neural network

An enhanced trajectory linearization control （TLC） structure based on radial basis function neural network （RBFNN） and its application on an aerospace vehicle （ASV） flight control system are presensted. The influence of unknown disturbances and uncertainties is reduced by RBFNN thanks to its approaching ability, and a robustifying itera is used to overcome the approximate error of RBFNN. The parameters adaptive adjusting laws are designed on the Lyapunov theory. The uniform ultimate boundedness of all signals of the composite closed-loop system is proved based on Lyapunov theory. Finally, the flight control system of an ASV is designed based on the proposed method. Simulation results demonstrate the effectiveness and robustness of the designed approach.     

Robust stability analysis for a cruise missile

A global controller design methodology for a flight stage of the cruise missile is proposed. This methodology is based on the method of least squares, To prove robust stability in the full airspace with parameter disturbances, the concepts of convex polytopic models and quadratic stability are introduced, The effect of aerodynamic parameters on system performance is analyzed. The designed controller is applied to track the overloading signal of the cruise segment of the cruise missile, avoiding system disturbance owing to controller switching, Simulation results demonstrate the validity of the proposed method.     

系统=φ(y)-F(x),=-g(x)零解的全局渐近稳定性

本文给出了广义Ｌｉéｎａｒｄ系统零解全局渐近稳定的充要条件．所得结果包含了文献［１—６］的主要结果     

广义Burgers-Fisher方程的精确孤波解(英文)

以三角变换简洁又精确地给出广义Ｂｕｒｇｅｒｓ－Ｆｉｓｈｅｒ方程的孤波解,其变换法是非常初等而有意义的     

两个浅水波模型的精确有理行波解

一个求发展方程有理行波解的方法被简化,由此可得到著名的ＫｄＶ方程和另一浅水波方程的一类新的精确行波解．     

实验Beagle犬精液冷冻保存方法初探

实验比格犬是生物医学研究中较常用的实验动物。采用以精液冷冻保存为基础的人工授精技术将大大推动实验犬的繁殖育种工作,为此,本实验尝试用两种不同配方的冷冻保存液,三种不同的冷冻程序进行了比格犬精液的冷冻实验,结果比格犬精液经冷冻保存后,最高解冻存活率达７４％,解冻复苏率达到９７．３％,此方法用于犬的人工授精具有一定的可行性。     

烫伤宁镇痛抗炎作用的实验研究

探讨烫伤宁是否具有镇痛抗炎作用,为其冶疗烫伤提供药效学依据。采用小鼠扭体、激光致痛等模型观察烫伤宁的镇痛效果,用小鼠耳肿法观察烫伤宁外用对急性渗出性炎症的影响。结果为烫伤宁无论灌胃或腹腔注射原药及稀释２～８倍（按０２ｍＬ／１０ｇ体重给药）,均显著抑制小鼠扭体反应;大鼠浅Ⅱ°烫伤创面外涂烫伤宁原药及稀释４、１６倍药液１ｍＬ,可显著提高激光致痛的痛阈。正常耳廓涂药不能对抗二甲苯所致耳肿胀。     

New coordination scheme for multi-robot systems based onstate space models

A new coordination scheme for multi-robot systems is proposed. A state space model of the multi- robot system is defined and constructed in which the system＇s initial and goal states are included along with the task definition and the system＇s internal and external constraints. Task accomplishment is considered a transition of the system state in its state space （SS） under the system＇s constraints. Therefore, if there exists a connectable path within reachable area of the SS from the initial state to the goal state, the task is realizable. The optimal strategy for the task realization under constraints is investigated and reached by searching for the optimal state transition trajectory of the robot system in the SS. Moreover, if there is no connectable path, which means the task cannot be performed Successfully, the task could be transformed to be realizable by making the initial state and the goal state connectable and finding a path connecting them in the system＇s SS. This might be done via adjusting the system＇s configuration and/or task constraints. Experiments of multi-robot formation control with obstacles in the environment are conducted and simulation results show the validity of the proposed method.