论光与眼睛及色彩的关系

“花开红树乱莺啼．草上平湖白鹭飞。”试想．如果没有太阳，你会感知到花开鸟飞的美景吗？也不会有什么蓝天、白云、青山、绿水、红色的苹果、黄色的柑橘、金首饰、银餐具、宽阔的马路、高大的楼房、美丽的脸蛋、华丽的时装等等。如果是在一片漆黑的夜晚里，再好看的一切，也都会失去它的魅力。     

Oseen流动中粘性对自由表面波的影响

Based on the complex dispersion relation for the two-dimensional free-surface waves generated by a moving body in the steady Oseen flows, the effect of viscosity on wavelength and wave amplitude was investigated by means of an asymptotic method and a numerical analysis. A comparison between the asymptotic and numerical analysis for the viscous decay factor demonstrates the validity of the perturbation expansions for the wave profile. The numerical result shows that the wavelength of viscous wave is slightly elongated in comparison with that of inviscid wave.     

弹性有限长度杆在轴向应力波传播和反射过程中的屈曲

讨论弹性有限长度杆端部受冲击载荷作用，在轴向应为波传播和反射过程中的动态屈曲问题．利用扰动方程的解、端部支承条件和应力波反射前后波阵面相容条件得到了动态屈曲的分叉条件，临界载荷和屈曲模态．数值结果表明：临界载荷有多个分支且随时间增加而降低；由于应力波在端部的反射，使临界载荷进一步下降．这个结果就解释了实验中的一些现象．     

二阶电路衰减系数α的修正

欠阻尼情况的RLC串联电路,用同频率的正弦波替代电感、电容两端的振荡波,测出电路的附加损耗,对衰减系数的理论值进行修正,可使衰减系数的实验值与理论值趋于一致。     

Experimental Study of Structure Shock Vibration in Soil Caused by Explosion of Conventional Weapons

When hitting underground structures directly or exploding in rock-soil media near underground structures, the conventional weapons with large charge weight will make underground structures be subjected to strong shock vibration and cause personal casualty and damage of precision electronic equipments. The shock vibration has become one of the cardinal killing means of weapons. However, the existing methods of predicting structure shock vibration are limited evidently. In this paper the coupling coefficient of acceleration in clayey soil is obtained firstly. Subsequently based on repeated experiments of chemical explosion, after dimension analysis and by using method of multivariate stepwise regression, the calculation formulae of shock vibration acceleration for the underground structure are obtained finally. The formulae consider top and side explosion respectively, taking into account the effects of penetration depth, charge weight, distance to explosion center, rock-soil media, size of structure and buried depth. They are easy to use with high practicability and degree of confidence, and can provide credible evidence for prediction of shock vibration and vibration isolating design of underground structure.     

(2+1)维长波方程组的精确解

运用数学中的映射方法分析论证,获得了(2 1)维长波方程组的精确解。     

果蝇振翅鸣声信号特征分析

发声是动物间进行交流的信息方式,声音信号的特征对应于动物的某种行为.以Matlab为工具,对采集到的雌、雄地中海果蝇飞行时振翅产生的声音进行了时域和频域的分析、比较,并提取其声音信号特征参数,即正常飞行鸣声的波形都为正弦波,声音的基频为147Hz,并带有多个谐波,其窄带声谱图具有良好的频率分辨率.研究还表明这种果蝇种内雌雄两性飞行时振翅特征有很大相似性.     

用改进的试探函数法求解广义KdV方程

试探函数法求解非线性数学物理中一个非常著名的非线性偏微分方程-广义KdV方程，求得其一般形式的指数函数解，据此不但求得了广义KdV方程的sech^2型钟状正则孤波解，而且求得了其csch^2型奇异行波解，最后，利用一些熟知的数学关系式，又求得其若干其它显式精确解，包括三角函数型周期波解等。     

高效率音频放大器的研究

论述了提高音频放大器效率的方法，介绍了D类放大器的电路组成，输出采用全桥式双极输出，采用占空比在0－100％可调的PWM信号进行控制使效率得到大幅度的提高。     

砂土地震液化的不确定性判别法综述

通过对不同自由场地液化势估计的方法和公式进行总结和比较 ,发现剪切波速比其它波的波速更能反映地基岩土层的工作性能 ,现已为全国地基勘察规范所采用