气泡尾流光学特性研究的发展评述

概述了气泡尾流研究的理论意义及其重要的实际意义，简述了用光学方法研究气泡尾流的基本原理和方法，介绍了气泡尾流光学特性研究的几个主要问题，综述了目前国内外在这一领域的研究现状并对未来的研究方向进行了展望。     

航海问卷调查中不完全数据的补缺方法研究

探讨期望最大化(Expectation Maximization,EM)算法在处理不完全数据统计中的应用,通过EM补缺,扩大统计样本数量,以避免航海科研中常常发生的问卷调查数据的缺失而造成统计分析的困难,从而提高了参数估计精度。然后运用电子表格方法对一个实例进行描述、建模和求解,避免了繁琐的计算和编程工作,为广大航海科研与实践管理工作者提供一种方便、有效的数据处理方法。     

车辆荷载对沥青路面破坏的影响研究

轮胎与路面间接触压力具有很明显的非均布性,根据轮胎胎面花纹的类型,提出荷载简化模型,并利用有限元计算分析不同荷载作用下的沥青路面结构响应。结果表明,轮胎与路面接触面的局部区域内,不同荷载模式的影响相当大,这对进一步解释路面面层的破坏现象提供有益的参考。     

压实路基组织光学参数的激光图像无损测量

设计了激光散射图像系统,并采集了3种不同干容重的路基组织的激光高光谱图像.分析了这3种干容重的路基组织的空间分辨漫反射率和距光源入射中心处半径之间的关联性,根据光漫射传输理论分析了路基组织的漫反射光分布规律,并应用非线性最小二乘拟合的方法得到这3种路基的光学参数(波长为632 nm).最后用这些参数进行了蒙特卡罗模拟光...     

吸声尖劈对板柱组合结构水下声学特性影响的试验研究

为考察吸声尖劈对船舶声纳平台水下声学环境的影响,开展了吸声尖劈对板柱组合结构水下声学特性影响的模型试验研究。通过对板柱组合结构0%、36%、60%、100%敷设吸声尖劈材料,在声波以0°、90°、180°方向入射板柱组合结构时,研究了尖劈敷设方式、声波入射角度对板柱组合结构水下声场及散射声场的影响,得到了不同工况下板柱组合结构典型部位的声场分布。研究表明:吸声尖劈可明显改变板柱组合结构的声场分布,降低板柱组合结构的自噪声;但其抑制效果随考核位置、声波频率、敷设密度的不同而各有变化。     

Quantification of six bioactive compounds in Zhenqi Fuzheng preparation by high-performance liquid chromatography couple

A simple and accurate high-performance liquid chromatography（HPLC）coupled with diode array detector（DAD）and evaporative light scattering detector（ELSD）was established for the determination of six bioactive compounds in Zhenqi Fuzheng preparation（ZFP）.The     

双层通道中可渗透底部起伏的波浪散射(英文)

The scattering of plane surface waves by bottom undulations in channel flow consisting of two layers is investigated by assuming that the bed of the channel is composed of porous material. The upper surface of the fluid is bounded by a rigid lid and the channel is unbounded in the horizontal directions. There exists only one wave mode corresponding to an internal wave. For small undulations, a simplified perturbation analysis is used to obtain first order reflection and transmission coefficients in terms of integrals involving the shape function describing the bottom. For sinusoidal bottom undulations and exponentially decaying bottom topography, the first order coefficients are computed. In the case of sinusoidal bottom the first order transmission coefficient is found to vanish identically. The numerical results are depicted graphically in a number of figures.     

经过海峡的双层流体由底部波动产生的斜向波散射问题研究(英文)

The problem of oblique wave(internal wave) propagation over a small deformation in a channel flow consisting of two layers was considered.The upper fluid was assumed to be bounded above by a rigid lid,which is an approximation for the free surface,and the lower one was bounded below by an impermeable bottom surface having a small deformation;the channel was unbounded in the horizontal directions.Assuming irrotational motion,the perturbation technique was employed to calculate the first-order corrections of the velocity potential in the two fluids by using Green’s integral theorem suitably with the introduction of appropriate Green’s functions.Those functions help in calculating the reflection and transmission coefficients in terms of integrals involving the shape function representing the bottom deformation.Three-dimensional linear water wave theory was utilized for formulating the relevant boundary value problem.Two special examples of bottom deformation were considered to validate the results.Consideration of a patch of sinusoidal ripples(having the same wave number) shows that the reflection coefficient is an oscillatory function of the ratio of twice the x-component of the wave number to the ripple wave number.When this ratio approaches one,the theory predicts a resonant interaction between the bed and the interface,and the reflection coefficient becomes a multiple of the number of ripples.High reflection of incident wave energy occurs if this number is large.Similar results were observed for a patch of sinusoidal ripples having different wave numbers.It was also observed that for small angles of incidence,the reflected energy is greater compared to other angles of incidence up to.These theoretical observations are supported by graphical results.     

时域有限差分法在地下目标散射中的应用

本文利用时域有限差分法计算了多种情况下地下目标的散射波形，并画出这些波的二维和三维图形。最后利用模拟实验同计算结果进行了比较并且得到了满意的比较结果，从以上工作可以看出该方法有较高的实用价值。     

基于电磁拓扑理论的场线耦合分析与仿真

扩展的BLT方程主要是用来计算电磁场对传输线上负载的干扰,是电磁拓扑理论的基石.本文对一个简化的空间辐射电磁场对平行双线耦合的模型进行分析,重新推导了该模型情况下的BLT方程的表达形式,并用软件仿真验证理论计算结果.这种方法可以用来计算和预测机车电磁兼容中瞬态电磁场对信号线或电力线的干扰.