Research on ultrasonic detection of complex surfaces

INTRODUCTION Parts of complex surfaces have found wide ap-plications today in airplane,ship,automobile industry,medical science,etc.How to detect the internal de-fects of parts of complex surfaces efficiently and ac-curately is an important issue.Due to its special ad-vantages of high sensitivity,good detection,strong penetration ability,and harmlessness to human body,ultrasonic detection has become a most important method of Nondestructive Test(NDT).However,at present in China,to detec…     

A resonator mode in linear arrays of silver spheres and cylinders

INTRODUCTION The waveguide properties of linear arrays (chains) of silver nano-particles at optical frequencies are well known (Krenn et al., 1997; 1999; Tretyakov and Viitanen, 2000; Girard et al., 1994; Weber and Ford, 2004). Silver spheres and ellipsoids can support forward or backward waves along the chain depend- ing on their polarization state and the eigenfrequency (Krenn et al., 1999; Tretyakov and Viitanen, 2000; Girard et al., 1994; Weber and Ford, 2004). At com- paratively …     

埋设管线穿过不同介质时的地震反应研究

本文应用表面波理论计算埋设管线穿过不均匀场地时的地震反应。用带竖直断面的分层介质模拟不均匀场地。从断面两侧的变形、应力连续条件近似确定两侧由表面波引起的场地运动,将所得的场地运动输入到以弹性地基梁模拟的管线上,得出管线的地震反应。最后通过计算实例对结果进行了比较分析。     

Clausius—Clapeyron方程在界面吸附体系中的应用

本文通过对界面吸附的讨论,了解Clausius-Clapeyron方程在此体系中的应用,得出在界面吸附平衡条件下的克—克方程一般表达式,并由此导出此条件下吸附热与理想气体分压及理想溶液浓度的关系.     

现代塑料制品表面装饰工艺分析

系统地介绍了现代塑料制品表面装饰的各种方法，针对制品表面要求和塑料自身属性，分析了各种表面装饰工艺的应用特点，给出了解决表面装饰技术难点的有效方法，提出了表面装饰设计与加工的数字化传达方式。     

面模型与球壳模型下的电场强度

通过采用面模型与球壳模型对均匀带电球面处的电场强度的计算与分析,揭示了其场强分布与所采用的物理模型的依赖关系,指出两种模型下谈及球面处的场强均有实际意义。     

长周期光纤光栅包层参数对透射谱影响的数值分析

以耦合模理论为基础,采用三层阶跃折射率光纤模型,导出了长周期光纤光栅透射率、峰值带宽的解析表达式,针对包层折射率和半径变化对透射谱的影响加以数值模拟.结果表明谐振波长位移与折射率的变化基本呈线性关系当包层半径较小时谐振波长位移及透射率的变化均较为明显,反之,其相应的变化则渐趋平缓.     

Sensing Escherichia coli O157：H7 via frequency shift through a self-assembled monolayer based QCM immunosensor

By means of the specific immuno-recognition and ultra-sensitive mass detection, a quartz crystal microbalance (QCM) biosensor for Escherichia coli O157H7 detection was developed in this work. As a suitable surfactant, 16-mercaptohexadecanoic acid (MHDA) was introduced onto the Au surface of QCM, and then self-assembled with N-hydroxysuccinimide (NHS) raster as a reactive intermediate to provide an active interface for the specific antibody immobilization. The binding of target bacteria with the immobilized antibodies decreased the sensor's resonant frequency, and the frequency shift was correlated to the bacterial concentration. The stepwise assembly of the immunosensor was characterized by means of the electrochemical techniques. Using the immersion-dry-immersion procedure, this QCM biosensor could detect 2.0×102 colony forming units (CFU)/ml E. coli O157H7. In order to reduce the fabrication time, a polyelectrolyte layer-by-layer self-assembly (LBL-SA) method was adopted for fast construction. Finally, the reproducibility of this biosensor was discussed.     

Numerical analysis of surface plasmons excited on a thin metal grating

INTRODUCTION It is widely known that a metal grating supports plasmon surface waves in the optics region (Raeter, 1982; Nevier, 1980). Excitation of a plasmon surface wave causes resonance absorption, which can be observed as partial or total absorption of incident light accompanied by an abrupt change of diffraction effi- ciency called resonance anomaly. If the grating is thick enough, the surface waves can be excited on the lit surface alone and the surface waves in this case are called…     

Research on surface characteristics of non-traditional finishing

INTRODUCTION Finishing is a kind of machining technology for greatly increasing the surface quality of a machined object while maintaining stable precision and im-proving the machining precision grade.Finishing is the last procedure for most parts and is an important manufacturing technology.Finishing can be divided into two kinds of technologies.One is traditional finishing which util-izes mechanical processes such as grinding,abrading,polishing,etc.;the other is non-traditional finishin…