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16 results on '"Xu, Xu-Yao"'

5. Theory and design of one-axis stable platform for rotation

Author

Xu Xu Yao and Lin Hui

Subjects
Engineering, business.product_category, business.industry, Projectile, media_common.quotation_subject, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Angular velocity, Servomechanism, Rotation, Inertia, Motion control, law.invention, Rocket, law, Control system, business, Computer Science::Operating Systems, Simulation, ComputingMethodologies_COMPUTERGRAPHICS, media_common
Abstract

one-axis stable platform for rotation can isolate rotation movement from inertia measurement unit and image identification devices, then the platform often is used in shrapnel, mortar projectile, rocket projectile and other conventional ammunition. Based on theory of one-axis stabilized platform for rotation. The paper designs a new stabilized platform for rotation, and specified the servo control system of the platform‥ The performance test for the platform shows that the design goal of design is accomplished and it meets the advance research and development of‥

Published
2011

13. Thermal Decomposition Synthesis of MoO3 for Application in Electrochemical Supercapacitors

Author

Zhou, Xiao Ping, Ma, Lin, Xu, Xu Yao, and Feng, Zong Cai

Abstract

MoO3 was synthesized by thermal decomposition of ammonium molybdate. The structure and surface morphology of the as-prepared MoO3 was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The supercapacitive behaviour of MoO3 in 1 mol L-1 KCl electrolyte was studied by cyclic voltammetry (CV), galvanostatic charge-discharge cycling (CD). The affect of thermal decomposition temperature on the capacitive behaviour of MoO3 was also discussed here. The results indicate that MoO3 show good capacitive behaviour with a specific capacitance of 148.9 F g-1 at 0.7 A g-1. Thermal decomposition temperature has an important influence on the capacitive behaviour and crystallization of MoO3.

Published
2014
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14. Rapid Microwave Synthesis and Fluorescence of LaF3 and LaF3:Re (Re=Ce3+, Eu3+, Tb3+) Nanocrystals

Author

Xu, Xu Yao, Ma, Lin, and Zhou, Xiao Ping

Abstract

LaF3 and LaF3: Re (Re= Ce3+, Eu3+ and Tb3+) nanocrystals have been successfully synthesized by a facile and rapid microwave heating method. The structure, morphology and fluorescent properties of the as-prepared products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and photoluminescence spectroscopy (PL). XRD patterns showed that the undoped and doped LaF3 nanocrystals had hexagonal structure with good crystallinity and high purity. TEM and HRTEM images showed that the LaF3 nanocrystals have uniform sizes with mean diameter about 20 nm and are characteristic of inner cavities. The luminescence spectra of the LaF3: Re (Re= Ce3+, Eu3+ and Tb3+) nanocrystals indicated that different rare-earth ions have been successfully doped in LaF3 matrix via the microwave heating method.

Published
2012
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15. Synthesis and characterization of novel flower-like CeF3 nanostructures via a rapid microwave method

Author

Ma, Lin, Chen, Wei-Xiang, Xu, Xu-Yao, Xu, Li-Mei, and Ning, Xue-Mei

Subjects
*NANOSTRUCTURED materials, *CERIUM, *MICROWAVES, *CRYSTAL growth, *ETHYLENEDIAMINETETRAACETIC acid, *SODIUM compounds, *CHEMICAL reagents, *X-ray diffraction
Abstract

Abstract: Novel flower-like CeF3 nanostructures with a mean diameter of 190nm were successfully synthesized via a rapid and facile microwave irradiation route using ethylenediaminetetraacetic acid disodium as the complexing reagent. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and photoluminescence (PL). XRD patterns showed that the CeF3 nanoflowers were hexagonal phase and had good crystallinity and purity. TEM and SEM images showed that the as-prepared CeF3 samples displayed 3D flower-like nanostructures and had uniform sizes and morphologies. The experimental results revealed that the as-prepared CeF3 nanoflowers might be assembled by nanodisks. The formation process of the CeF3 nanoflowers was preliminarily investigated. [Copyright &y& Elsevier]

Published
2010
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16. Synthesis and characterization of flower-like MoS2 microspheres by a facile hydrothermal route

Author

Ma, Lin, Xu, Li-Mei, Xu, Xu-Yao, Luo, Yang-Li, and Chen, Wei-Xiang

Subjects
*MOLYBDENUM compounds, *MICROSTRUCTURE, *CHEMICAL processes, *INORGANIC synthesis, *METAL crystal growth, *NANOSTRUCTURED materials, *MATERIALS analysis
Abstract

Abstract: Flower-like MoS2 microspheres with high purity were successfully synthesized via a facile hydrothermal route by adding sodium silicate as an additive. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). XRD patterns showed that the MoS2 microspheres had good crystallinity with well-stacked layered structure. TEM and SEM images showed that the MoS2 microspheres had uniform sizes with mean diameter about 480 nm and were constructed with MoS2 sheets with thickness of several nanometers. It was found that the possible precursor H4SiMo12O40 obtained by sodium silicate reacting with sodium molybdate played a crucial role in the formation of the flower-like MoS2 microspheres in our experiment. A possible formation mechanism of MoS2 microspheres was preliminarily presented. [Copyright &y& Elsevier]

Published
2009
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