Constraint Dynamics and Tracking Control to Coherence of a Thermal Dissipative Qubit

Constraint dynamics and tracking control strategy to stabilize the coherence of a decoherent system is applied to a dissipative qubit system at a finite temperature. By using a control field dependent on the dynamical state of the qubit via the constraint equations, we show that the coherence of the qubit can be preserved within a finite time duration by the feedback effect of the qubit system. It is also shown that the temperature plays a negative role to this coherence control strategy.     

一类圆周自映射的伪轨跟踪性质

本研究圈周上的连续自映射，我们得到一类非满映射具有伪轨跟踪性质的充分必要条件。     

互补问题的一个修改算法

本文给出了一个修改的路径跟踪预测校正非内点算法 ,同时给出了一个新的中心路邻域的表示 .并在此基础上给出了全局和局部收敛性 ,最后给出的数值结果验证了其有效性     

A three-dimensional sound ray tracing method by deploying regular tetrahedrons

A sound ray tracing algorithm is presented, which helps to rapidly find the sound ray trajectories in three-dimensional (3-D) space. At each step of ray tracing, a small regular tetrahedron is made in front of a ray, so that the sound speed field inside may be approximately regarded as linear. Since a ray trajectory in the linear sound speed field is always on a plane, it may be obtained by the two-dimensional (2-D) sound ray tracing method by deploying triangles. The theoretical derivation is given and a numerical model is discussed. It shows that the algorithm is fast and precise. It is also more concise and reliable than the traditional 3-D algorithms, and may be used to avoid the damage to the precision by the acoustic refraction in the 3-D ultrasound computerized tomography.     

电视导引头跟踪系统物理建模与分析

对某型空地导弹电视导引头进行实测建模，通过建模和仿真分析，对系统提出改进意见。     

现阶段末制导红外成像跟踪系统性能提高的技术途径

提出现阶段提高末制导红外成像跟踪系统性能的几个主要技术途径：变帧频技术、非均匀性校正技术、识别与跟踪技术等．并探讨其实现方法。     

我国自主研制的医用超声设备声输出测试系统通过专家鉴定

国家药品监督管理局委托全国医用电器标准化技术委员会,于2003年2月27日主持对上海市医疗器械检验所委托上海交通大学研制的SJTU-1型医用超声设备声输出测量系统,进行了技术鉴定。鉴定会委员审阅了全部有关资料、认真听取了研制组负责人寿文德教授所作的研制报告和测试组提供的测试报告,并现场参观了该测量系统的实际操作与测量。通过认真讨论,取得如下一致鉴定意见。 1 SJTU-1型声输出测量系统的研制成功,对于贯彻超声诊断设备声输出的国家标准(与国际标准同)具有重要意义。     

跟踪雷达测量误差的统计模型(Ⅰ):模型的建立

本文提出以如下具有慢时变万差的线性回归－自回归混合模型用于描述跟踪雷达测量误差的变化规律，并提出了模型个数的估计方法．数值例子表明，本文提出的模型能较好地拟合跟踪雷达误差数据．     

大气湍流对激光跟踪系统角精度的影响

讨论了大气湍流对激光跟踪系统角精度的影响，利用相位屏法计算了大气湍流对激光跟踪系统引起的误差，计算表明，在正常条件下，大气湍流引起的跟踪误差，可达几十微弧度。     

C*-crossed products by ℝ, III: Traces

When a flow on a C*-algebra has KMS states we study traces on the associated crossed product to show that they are determined by KMS states under a mild assumption on the flow.