Authors: Jing Yi Cui, Liquan Guo, Ju Sheng Ma
Abstract: Adding nano-particles with high refractive index can greatly improve the optical
properties of the PMMA-based composites, which were developed as the new-type rear projection screen. In this paper, the influence on the optical properties, such as gain and view angle, by the content of additive TiO2 nano-particle was studied. Curves of optical properties versus content of nano-particle were obtained and the rational factors were found. Finally the reasons were discussed from the nanostructure point of view and the scattering principle.
997
Authors: Yung Cheng Wang, Chiun Jie Lin, Chao Jung Chen, Huay Chung Liou
Abstract: Precision positioning is an essential basis for precision mechanical engineering, such as
positioning for precision manufacture, or positioning control of robot arms. Due to the increasing
demand for precision in the submicrometer range, precision positioning plays an important role for
precision manufacture.
In this investigation a nano-positioning stage is developed. With the positioning system, high
precision positioning and large displacement range can be achieved simultaneously. Advantages of
this developed system are positioning driver with single actuator, uncomplicated mechanical
structure, low cost and lower hardware requirement.
A laser interferometer is used for displacement measurements of the translation stage, and a
mini-autocollimator serves as angle sensor for tilt angle measurements. The tilt angle can be
minimized with piezo translators and control operations. By the displacement measurements of
laser interferometer, the feedback control is performed for positioning in large travel range.
High precision positioning in nanometer-order can be achieved with the positioning system.
With this development, individual sensor modules are self-accomplished and dominating
technologies for the complete nano-positioning system are established.
768
Authors: Shiuh Chuan Her, Sheng Tung Lin
Abstract: Ultrasonic is one of the most common uses of non-destructive evaluation technique. It could detect flaws inside the structure and on the surface such as voids, holes and cracks. In this investigation, a 304 steel block with a surface-breaking crack was fabricated. A series of test specimen with different depths of surface-breaking crack ranging from 2mm to 9mm was fabricated. The depth of the surface crack was evaluated by the pulse-echo ultrasonic technique. In this work, 2.25MHz, 5MHz and 10MHz of incident waves were employed to detect the depth of the surface-breaking crack. The effect of incident angle on the measuring accuracy was investigated. Experimental results showed that the accuracy of crack sizing detection by ultrasonic technique is not only dependent on the frequency of the incident wave but also dependent on the incident angle.
865
Authors: Yang Li, Xiao Dong Zheng, Lin Fang Shen
Abstract: Ethylene Vinyl Acetate (EVA) as package material is widely used in solar cells modules. Conventionally, it is laminated on both sides of solar cells with a planar surface profile, which will lead to high reflectance when the light incident angle is larger than 60°. We proposed a 1-dimensional triangular surface profile of EVA on solar cell modules with base angle about 43°. The investigations show that a 9.9% efficiency improvement of solar cells can be obtained by reducing its surface reflectance.
445
Authors: Wei Wu, Toshiki Hirogaki, Eiichi Aoyama
Abstract: Recently, new needs have emerged to control not only linear motion but also rotational motion in high-accuracy manufacturing fields. Many five-axis-controlled machining centres are therefore in use. However, one problem has been the difficulty of creating flexible manufacturing systems with methods based on the use of these machine tools. On the other hand, the industrial dual-arm robot has gained attention as a new way to achieve accurate linear and rotational motion in an attempt to control a working plate like a machine tool table. In the present report, a cooperating dual-arm motion is demonstrated to make it feasible to perform stable operation control, such as controlling the working plate to keep a ball rolling around a circular path on it. As a result, we investigated the influence of each axis motion error on a ball-rolling path.
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