自回归状态空间模型下时变声速剖面跟踪方法

讨论了一种适用于浅海的时变声速剖面跟踪方法。该方法将时变水体声速剖面的反演问题建模为由描述声速剖面时变特性的状态方程与包含声压场局部测量信息的测量方程组成的状态-空间模型,提出利用自回归分析拟合方法将声速场扰动建模为高阶自回归演化模型,并通过集合卡尔曼滤波序贯地估计时间演化的海洋声速场。利用2001年亚洲海实验环境与声速测量数据,仿真分析了基于高阶自回归演化模型的时变声速剖面集合卡尔曼滤波估计方法。结果表明,相比于利用传统随机游走状态演化模型的估计方法,该改进方法可有效降低声速的跟踪误差,并且在较低信噪比条件下仍具有较好的跟踪性能。     

A nonenzyme glucose sensor based on Cu/Ni/CMWCNTs nanocompositesEI北大核心CSCD

Copper-nickel bimetallic nanoparticles decorated on carboxylated multi-walled carbon nanotubes （Cu/Ni/CMWCNTs）were prepared by using a simple one-pot solvothermal method,which was then employed to construct a highly sensitive non-enzymatic glucose sensor. The modified electrode showed high sensitivity and stability in glucose detection,which was mainly attributed to the synergistic effect of the compact copper-nickel nanocomposite and carboxylated multi-walled carbon nanotubes that possessing high specific surface area to increase the number of active sites and to improve the electrocatalytic activity of the modified electrode. The phase structure and morphology of the material were characterized by X-ray diffraction and scanning electron microscope; the electrochemical performance of the sensor was studied by cyclic voltammetry and chronoamperometry. The sensor had a sensitivity of 1949.1 μµA·L/（mmol·cm2）for glucose detection in the linear range of 1.0-8000 μµmol/L at a potential of 0.55 V,and the detection limit was 0.2 μµmol/L. The sensor was also applied to measure the concentration of glucose in serum samples. The developed nanocomposites sensor has the potential prospect to monitor blood glucose. © 2023, Youke Publishing Co.,Ltd. All rights reserved.     

有机铜作为润滑油高温抗氧剂的研究

在高档的润滑油中除了加有主抗氧剂ZnDTP外，还需加入其它助抗氧剂以弥补其高温抗氧性的不足。本研究合成了几种有机铜盐高温抗氧剂，用DTA法评价了它们及一些常用抗氧剂对润滑油的热稳定性的影响，发现铜铜盐的高温抗氧性能比一些常用抗氧剂好，可满足高档油的需求。     

带羟基炔烃单体的聚合与共聚合的研究

本文首先报导带羟基的炔烃单体以反它们与环氧化合物的的加成物在 ZnCl_2或(Ph_3P)_2·PdCl_2存在下,能有效地进行聚合和与酞腈的共聚合反应。IR、NMR、MS、DSC、元素分析和电性能测试结果表明,聚合物和共聚物的主链为共轭结构,具有半导体性质。     

激光驱动器能源系统实验平台测控系统的研究

 为了提高激光驱动器能源系统运行的稳定性、可靠性、安全性,研制了一套能源系统实验平台的测控系统。该测控系统采用RS-232串行通讯、多线程程序设计来完成并行处理,具有较强的抗干扰能力,可远距离的进行自动控制、数据采集,并能及时的进行数据处理和分析,显示报表并打印。该项研究的结果为大型激光装置的相关系统设计提供了依据。     

THE STABILITY OF STATIONARY SOLUTION FOR OUTFLOW PROBLEM ON THE NAVIER-STOKES-POISSON SYSTEM

In this article, we are concerned with the stability of stationary solution for outflow problem on the Navier-Stokes-Poisson system. We obtain the unique existence and the asymptotic stability of stationary solution. Moreover, the convergence rate of solution towards stationary solution is obtained. Precisely, if an initial perturbation decays with the algebraic or the exponential rate in space, the solution converges to the corresponding stationary solution as time tends to infinity with the algebraic or the exponential rate in time. The proof is based on the weighted energy method by taking into account the effect of the self-consistent electric field on the viscous compressible fluid.     

基于激发态分子内质子转移(ESIPT)原理的反应型荧光探针研究进展

基于激发态分子内质子转移(ESIPT)原理的反应型荧光探针,因其具有高选择性、高灵敏度及大的斯托克斯位移等优点而被广泛关注.以检测目标物的属性归类,就近十年ESIPT反应型荧光探针进行综述,阐述其检测识别机制,并对此类荧光探针应用中存在的问题及发展方向进行评述.     

可变形儒可夫斯基翼型非定常气动力的研究

对于翼面变形法向运动速度远小于来流速度的儒可夫斯基机翼,将解析解和离散涡方法相结合计算变形机翼的流场及非定常气动力,较详细地分析了变形机翼升力系数的准定常计算方法的误差来源,并给出修正方法.计算结果显示脱落涡尾迹对升力系数和机翼绕流环量的影响很小,变形机翼升力系数准定常计算方法的误差丰要来源于流体非定常运动引起的虚拟质量力,该非定常附加升力仅与当前时刻飞行姿态及翼犁形状和变形速率有关,与具体的变形历史过程无关,变形机翼的升力近似等于准定常计算结果叠加上相应的虚拟质量力.     

e~+e~-湮灭成两喷注中的末态强子快度分布和B■关联

本文在文献[1]给出的模型中,进一步赋给夸克简单的四动量分布,通过Monte-Carlo计算,不但得到了与实验符合得很好的轻夸克喷注事例末态强子快度分布等,还给出了与实验基本一致的末态重子反重子之间的快度和角度关联.     

PVC改性聚丙炔醇

本文研究了用 PVC 改性的聚丙炔醇的合成与性能。测定了聚合产物的组成曲线。热分析表明。少量的 PVC 可大大提高改性聚合物的起始失重温度和分解温度:红外光谱显示,聚合时 PVC 含量越高,聚合产物中共轭链段的长度越短:扫描电镜图像显示.PVC 改性聚合物的表面结构比丙炔酵均聚物要致密。