月球表面遥感图像阴影消除及其信息恢复研究

由于月球表面的地形起伏引起月面遥感图像像素与太阳相对位置和几何取向不一致,导致月面遥感数字图像上阴影像素的产生。为了解决这一问题,利用与遥感图像匹配的DEM和光照方位参数进行遥感图像的阴影判断,基于DEM数据,利用邻坡反射辐射,进行自然地形条件下的月表遥感图像阴影像素的阴影消除,恢复成太阳光谱照度相等（入射角,反射角和距离相同）时的像素遥感值。仿真实验结果表明：该方法较好地消除了月表影像的阴影,充分恢复了月表影像的反射/光谱特征。     

环氧大豆油与丙交酯星形共聚物支化度的表征

采用凝胶色谱(GPC)/示差检测器(RI)/十八角激光光散射仪(MALLS)联用技术, 对环氧大豆油(ESO)与丙交酯形成的星形共聚物(ESO-丙交酯)的结构进行了表征。实验结果表明: 随着ESO-丙交酯星形共聚物分子量的增长, 接枝数目呈现增多趋势、支化度从0.46E-4增大到0.78E-4、支化因子从0.82减小到0.15。本研究为高分子ESO-丙交酯星形支化共聚物的研究提供了科学依据。     

便携式表面等离子体共振传感器温度特性

采用美国德州仪器公司开发的Spreeta系列小型化SPR传感模块,实验研究了环境温度变化对便携式表面等离子体共振传感器工作特性的影响.发现随着温度的升高,共振角度向小角度方向移动,并提出了完整的理论分析模型.该模型讨论了环境温度变化对金属薄膜、棱镜、待测物的物理性质的影响,模拟结果与实验测量结果吻合得很好.     

脉冲管制冷机调相惯性管的设计理论及通用图表

本文介绍一种针对纯惯性管以及惯性管加无限大气库的选型图表.系统介绍了其设计理论.通过与实验值的对比,采用了符合较好的简化湍流模型进行计算.为了使图表易于使用,本文提出了一组更实用的无量纲参数和计算"无限大"气库体积的方法.最终,通过两个实例,给出了应用该表的使用方法和应注意的问题.     

吸附式叶栅代替串联叶栅气动可行性探索

本文首先以ONERA串列叶栅为研究对象,利用数值模拟的方法对串列叶栅特性及其内部流动进行了分析,在此基础上,设计了与串列叶栅具有同等性能的单列吸附式叶栅,并在设计工况和非设计工况下对改型后的单列吸附式叶栅特性及其内部流场进行了详细分析.结果表明:在相同来流马赫数、出口条件和扩散因子的情况下,单列吸附式叶栅的性能优于串列叶栅,在高负荷压气机设计中用吸附式单列叶栅代替串列叶栅的做法是可行的.     

二维颗粒运动以及传热的数值模拟

本文提出了直接热源算法(Direct heat source)使得颗粒壁面温度满足Dirichlet边界条件,同时采用Wang等提出的内嵌边界方法(Immersed boundary method)和多重直接力算法(Multi-direct forcing)全尺度模拟二维颗粒的运动.本文计算了运动的冷颗粒在不同Grashof数时的运动状态.本文的计算结果与其他学者的计算结果符合得很好,从而验证了本文采用的方法的精确性与有效性.     

Structural Equation and Mei Conserved Quantity of Mei Symmetry for Appell Equations in Holonomic Systems with Unilateral Constraints

Structural equation and Mei conserved quantity of Mei symmetry for Appell equations in holonomic systems with unilateral constraints are investigated. Appell equations and differential equations of motion for holonomie mechanic systems with unilateral constraints axe established. The definition and the criterion of Mei symmetry for Appell equations in holonomic systems with unilateral constraints under the infinitesimal transformations of groups axe also given. The expressions of the structural equation and Mei conserved quantity of Mei symmetry for Appell equations in holonomic systems with unilateral constraints expressed by Appell functions are obtained. An example is given to illustrate the application of the results.     

Performance testing of a long-strip two-end readout multi-gap resistive plate chamber

Multi-gap Resistive Plate Chamber （MRPC） is a new generation of gas detector with good timing and spacial resolution, whose technique is widely applied in some recent high energy （nuclear） physics experiments. In this letter, we report a long-strip two-end readout MRPC and its test beam performance. The measurements show that the long-strip performs a transmission line characteristic and the impedance is independent of the length of strip. The MRPC module we developed is presented to gain a timing resolution of -80 ps and a spacial resolution of -6.4 mm. The possible application of the MRPC is also discussed.     

Measurement of Magnetic Properties of an Inertial Sensor with a Torsion Balance

A torsion balance is constructed to accurately measure the magnetic properties of the real proof mass of the inertial sensor. The magnetic susceptibility and remnant moment of a titanium proof mass are measured in the first experiment, and further improvements and the potential sensitivity are also discussed. This is significant for choosing the material of the proof mass and investigating the magnetic disturbances acting on the proof mass.     

Dependence of Nanofluid Viscosity on Particle Size and pH Value

We investigate the viscosity of silicon dioxide nanofluid at different particle sizes and pH values considering nanoparticle aggregation. The experimental and simulation results indicate that nanoparticle size is of crucial importance to the viscosity of the nanofluid due to aggregation. As the nanoparticle size decreases, the viscosity becomes much more dependent on the volume fraction. Moreover, when the nanoparticle diameter is smaller than 2Ohm, the viscosity is closely related to the pH of the nanofluid, and fluctuates with pH values from 5 and 7.