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《Ceramics International》2016,42(16):18516-18520
CeO2 nanostructures with completely different morphologies were successfully prepared using the same cerium source and mineralizer through the direct and indirect hydrothermal methods with different introducing strategies of PVP surfactant. The CeO2 nanostructures tend to form the morphologies of nano-flowers and nano-cubes through the indirect and direct hydrothermal methods, respectively. X-ray diffraction (XRD) analyses revealed that both as-prepared nanostructures are composed of CeO2 with a standard fluorite structure. The different synthesis mechanisms and corresponding chemical evolutions of the as-prepared CeO2 nanostructures are discussed based on the different introducing strategies of PVP surfactant in the direct and indirect hydrothermal processes. Investigation of the UV-shielding ability of both CeO2 nanostructures suggested that the UV absorbance of the nano-flowers is much higher than that of the nano-cubes. 相似文献
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三十二式太极剑是高等院校体育教学的重要组成部分,对促进大学生身心健康发展有极其重要的作用。为推动高等院校太极剑教学的发展,培养学生的终身体育意识。本文从三十二式太极剑教学的角度,探索分析太极剑的教学方法,以达到提高三十二式太极剑教学效果的目的。 相似文献
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联系测量是进行矿山控制测量的一项重要工作,传统的联系测量是通过矿井定向和高程传递两种方式实现,对测量条件要求较高且测量误差较大。因此,随着测量仪器的自动化、智能化程度越来越高,需要开展自动化程度和效率高的联系测量方法研究。提出了采用测量机器人与陀螺全站仪联合进行联系测量的方法。分析了利用测量机器人测三角高程代替水准测量进行高程传递,以及利用测量机器人测导线和陀螺全站仪进行定向的精度。针对井上下连接测量时井下测量机器人寻找上部棱镜困难的问题,研制了连接专用工具,并结合工程实例进行了方法可行性验证。研究表明:该方法能够满足矿井联系测量精度要求,与传统方法相比具有技术可行、精度可靠、简单方便的优点,有较好的应用价值。 相似文献
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An existing experimental method to determine cohesive laws for adhesive layers loaded in shear is further developed. The method is based on differentiation of the energy release rate (ERR) with respect to the adhesive shear deformation at the crack tip. The test geometry used is an ENF-specimen for which the adherends are assumed to deform linearly elastic. The original method is expanded to account for situations where the thickness of the adhesive layer is not negligible as compared to the adherend thickness. To this end, a novel mathematical expression for the energy release rate (ERR) is derived. No assumptions on the form of the cohesive law are made; it is implicitly included in the derivation. The expression for the ERR contains the applied load and the shear deformation of the adhesive layer at the initial position of the crack tip, in addition to geometrical properties and the elastic modulus of the adherend material. Numerical simulations are performed to verify the accuracy of the mathematical expression for the ERR. Preliminary results from experiments performed on an epoxy adhesive are presented. The cohesive law of the adhesive layer is extracted by using a blunted crack tip. Verifying simulations confirm that the local pre-fracture behavior is accurately captured. 相似文献
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