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A facile route to tungsten oxide nanomaterials with controlled morphology and structure

Particuology 2011年第5期9卷 517-521页

作者： Hsuan-Ching Lin Cherng-Yuh Su Zhong-Kun Yang Chung-Kwei Lin Keng-Liang Ou institute of Atomic and Molecular Sciences Academia Sinica Taipei Taiwan China institute of manufacturingengineering National Taipei University of Technology Taipei 106 Taiwan China Department of Materials Science and Engineering Feng-Chia University Taichung 407 Taiwan China Department of Oral Medicine Taipei Medical University Taipei 110 Taiwan China

Various tungsten oxide-based nanomaterials have been prepared by a modified plasma arc gas condensation technique without the use of catalysts or substrates. These products could be obtained by controlling the processing parameters during experiment. All the as-obtained samples were characterized by field emission gun scanning electron microscopy, high-resolution transmission electron microscopy, and X- ray diffraction techniques. The results revealed that as-prepared tungsten oxide nanomaterials （WO3, W190s5 and WsO14） with different phases and morphologies could be obtained by decreasing the oxygen content in the chamber. In addition, W18049 nanotubes and nanorod bundles were fabricated by con- trolling the Ar/O2 ratio under He plasma gas. W18Q9/TiO2 core-shell nanoparticles were also prepared by evaporating a dual target. The experimental results showed that the present technique is unique and feasible for the fabrication of nanomaterials for use in different applications.

关键词： Plasma arc gas condensation Titanium oxide Tungsten oxide Nanoparticle Nanorods

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A comprehensive analysis of a 3-P （Pa） S spatial parallel manipulator

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Frontiers of Mechanical Engineering 2015年第1期10卷 7-19页

作者： Yuzhe LIU State Key Laboratory of Tribology and institute of manufacturingengineering Department of Mechanical Engineering Tsinghua Uni-versity Beijing 100084 China Beijing Key Laboratory of Precision/Ultra-precision ManufacturingEquipments and Control Beijing 100084 China

In this paper, a novel 3-degree of freedom （3- DOF） spatial parallel kinematic machine （PKM） is analyzed. The manipulator owns three main motions （two rotations and one translation） and three concomitant motions （one rotation and two translations）. At first, the structure of this spatial PKM is simplified according to the characteristic of each limb. Secondly, the kinematics model of this spatial PKM is set up. In addition, the relationship between the main motions and concomitant motions is studied. The workspaces respectively based on the outputs and inputs are derived and analyzed. Furthermore, the velocity model is put forward. Two indexes based on the velocity model are employed to investigate the perfor- mance of this spatial PKM. At last, the output error model can be obtained and simulated. The comprehensive kinematics analysis in this paper is greatly useful for the future applications of this spatial PKM.

关键词： parallel mechanism concomitant motions,kinematics workspaces error model

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