富Ti-TiNi形状记忆合金薄膜的析出相与相变

研究溅射富Ti－TiNi合金薄膜中的析出相及相变温度随退火温度和时间的变化规律;同时对富Ti－TiNi合金薄膜的马氏体相变温度比块村富Ti－TiNi合金及富Ni－TiNi合金薄膜低的原因进行讨论．     

Cu/Ni多层膜的电阻与位错

采用电桥及X射线衍射线形分析法研究磁控溅射Cu／Ni多层膜（CLI及Ni单层厚度均为5nm）的室温电阻率及平均位错密度随对层（bilayer）层数的变化规律．结果表明,随层数增加,电阻率及平均位错密度减少;多层膜电阻率大于单层膜电阻率;单层膜电阻率大于同质块状体的电阻率．并对其微观机制进行分析．     

Structural Optimization of Damping Groove Based on Valve Plate Dynamic Cavitation Response Model

To reduce cavitation occurring on valve plate of piston pump,an optimization design method was introduced to quantitively analyze the accurate relationship between structural jet groove parameters and cavitation. Using the computational fluid dynamics（ CFD） method,the absorbing and discharging processes in piston pump were simulated dynamically. The damping groove＇s structure effects on both jet angle and pressure shock were analyzed visually with a series of different parametrical grooves. By establishing parametrical damping groove model,the piston pumps＇ dynamic analysis was integrated with CFD analysis,experimental design and approximation model, etc. The mathematical model of plunger pressure during oil back period,jet angle and structural parameters of damping groove were established in the form of second-order response surface method（ RSM） model. The damping groove structure of valve plate was optimized on the basis of the RSM model. Test data shows that the anti-cavitation performance of optimized valve plate was obviously improved. And this method provides theoretical foundation for the structure design of damping groove.     

Bergman-Sobolev空间上Toeplitz算子的本性范数（英文）

文章研究了Bergman-Sobolev上Toeplitz算子的某些性质,主要通过该类算子的符号函数在边界处的行为计算了它们的本性范数.     

面向目标跟踪的单平台主被动传感器长期调度

以目标跟踪为背景,研究了单平台上主被动传感器的长期调度问题。通过合理、实时地切换主被动传感器,使得有限时域内的跟踪精度和辐射风险达到合理的平衡。将该调度问题构建成部分可观马氏决策过程(partially observable Markov decision process, POMDP)以同步实现目标跟踪和辐射控制。提出以容积采样法估算长期精度收益,以隐马氏模型滤波器推导长期辐射代价。最终将原问题转化成决策树并利用分枝定界法进行求解。仿真结果证明了本方法的有效性。     

Toeplitz算子的可逆性

讨论了本性有界函数的本性值域以及Toeplitz算子的可逆性与本性可逆性,给出了符号在L^∞中的Toeplitz算子为Fredholm算子的充要条件．     

函数空间上Toeplitz算子的酉等价性

讨论Bergman空间和Dirichlet空间上Toeplitz算子的酉等价性,认为在这两类空间上,Toeplitz算子的酉等价问题比经典的Hardy空间情形复杂。     

一种改进的不敏粒子滤波算法

提出了一种改进的不敏粒子滤波（UPF,Unscented Particle Filter）算法。和传统的UPF相比,该算法有两点改进,首先,在形成＂粒子云＂时,直接采用当前时刻各粒子的UKF（Unscented Kalman Filter）估计作为粒子,在保证粒子有效性的同时,减少了UKF之后的重采样过程;然后,结合新的粒子产生办法,重新定义了权值计算方法,避免了对各粒子重要概率的复杂计算。仿真表明,改进算法在减少计算量的同时,有效地提高了跟踪稳定性和跟踪精度。

Abstract：

An improved Unscented Particle Filter （UPF） algorithm was proposed.Compared with traditional UPF,it has been improved at two points.First,when producing particle cloudy,it directly uses the current particle estimation of Unscented Kalman Filter （UKF） as new particle,which guarantees the validity of particles and eliminates the re-sampling process after UKF as well;then,according to the new particle-producing method,a weight-calculating formula is re-defined,so as to avoid the complicated computation of proposal probability of every particle.A simulation shows that the Improved UPF （I-UPF） can effectively enhance the tracking stability and tracking precision and reduce computational cost at the same time.     

打通学生数学学习的任督二脉

 我们常常用“灵性”、“灵气”来形容一个人的聪明,学习也存在“灵性”问题。可惜的是,学生的学习“灵性”被我们的教育磨掉了。     

再生水中亚硝酸盐对余氯衰减的影响及其控制

根据华北地区某再生水厂的实际水质特点,通过实验比较了加氯消毒后水中TOC、NO2-对余氯消耗的影响;使用平行一级反应模型分析实验结果,发现折点氯化后亚硝酸盐耗氯反应的速率常数显著高于有机物耗氯反应,亚硝酸盐成为再生水中重要耗氯物质．为稳定再生水中余氯浓度,提出了2个方案：再生水中加氨或调节pH值,分别进行了模型拟合和实验效果分析．通过对比加氨和调pH值方案的余氯成分和所需药剂投量,得出调节水体至弱碱性（pH值为8．3）是更好的途径．本研究对再生水厂消毒工艺的设计、运行具有一定的借鉴意义,对保证再生水水质安全具有较高的实用价值．