In the present dissertation , friction - induced noises emitted by a flat specimen rubbing against another flat specimen or a ball specimen under reciprocating sliding are studied . the detailed observation of the scars is conducted by means of a scanning electrical microscope ( sem ) , laser scanning microscope ( lsm ) , optical microscope and profilometer . the dynamic state variables are analyzed in detail using the discrete wavelet transform 使用电子扫描显微镜( sem ) 、激光扫描显微镜( lsm ) 、光学显微镜和表面轮廓测量仪等设备对摩擦噪声发生的区域进行了详细的观察和分析,运用小波变换技术对摩擦噪声状态下的动力学变量进行了深层次的研究,应用matlab simulink语言对摩擦系统进行了振动动力学仿真,系统地研究了摩擦噪声的形成机理。
Abstract : the 15 rice traces in the pottery of dulingao ruin were studied with scanning microscope . the like - indiea in grain shape and like - japonica of bi - peaked tubercle and the few remaining charac - ters of o . rufipogon of chaling area were observed , with the conclusion that they are a type of original cu - tivated minute - grain japonica 文摘:用扫描电镜对独岭坳遗址红烧土中解剖出来的15粒水稻印痕进行观察研究,发现粒形似籼而双峰乳突纵横排列特征近于粳稻,尚留有茶陵野稻的某些特征,认定为属于二向演化的原始小粒栽培粳稻类型。
Supported financially by the national natural science foundation of china , employing the testing techniques such as optical metallography analysis , scanning electron microscope ( sem ) , electron microprobe scanning microscope ( emsm ) , transmission electron microscope ( tem ) , x - ray diffraction ( xrd ) and mechanical performance measurements ( including micro - yield strength mys ) etc . , this research has worked comprehensively and deeply on a very important issue ? the micro - yielding behavior and mechanism of beryllium material for inertial guidance instruments and optical mirrors ? which has been paid more attention to by designers since the 8th even the 7th five - year plan 在国家自然科学基金资助下,本研究采用光学金相显微镜,扫描电镜( sem ) 、电子探针( emsm ) 、透射电镜( tem ) 、 x射线衍射( xrd ) 、力学性能(包括微屈服强度_ ( mys ) )等测试技术,较详尽和深入地研究了“七五” 、 “八五”计划期间用户一直希望解决的惯性导航和光学镜体铍材一个十分重要的问题:微屈服行为及机理。