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The relationship between the main geometrical parameters of the center-driven timber gripping device has been analyzed, and various parameters have been designed from the traditional approach of in dividual selection to systematical and synthetical consideration. Therefore, the matching relationship between various main parameters is resolved reasonably, and the design quality is improved. 本文以中央驱动式木材抓具为研究对象,分析了其主要几何参数相互之间的关联关系,探讨了各参数设计从传统的逐个单独选择方式,过渡到系统的综合考虑方式的可能性。对合理解决好各主要参数之间的匹配关系,提高设计工作质量具有参考价值。 The test results on the centre actuated fan clutch with the shape memory spring set on the engine are presented. The results show that this clutch has advantages of rational structure, reliable work, clear fuel-saving and so on. 本文介绍了形状记忆弹簧中央驱动式风扇离合器装于发动机的试验结果。结果表明:这种离合器具有结构合理、工作可靠和节油明显等优点。 The high energy radiation mechanism research of active galactic nuclei is a key to understanding their structure, evolution features and origin of central drive. During the recent decades, along with developments of AGNs structure research and high energy continuum spectra observations, the non-thermal electron pair cascade models, which can be used to explain the high energy radiation of AGNs, have been developed and are being perfected. In this paper we review the background and research progress of pure... The high energy radiation mechanism research of active galactic nuclei is a key to understanding their structure, evolution features and origin of central drive. During the recent decades, along with developments of AGNs structure research and high energy continuum spectra observations, the non-thermal electron pair cascade models, which can be used to explain the high energy radiation of AGNs, have been developed and are being perfected. In this paper we review the background and research progress of pure Compton non-thermal electron pair cascade models, and meanwhile focus on their radiative transfer handling and thermal electrons Compton scattering. Finally we will give a comment on the models' advantage and disadvantage in explaining high energy radiation of Active Galactic Nuclei. 活动星系核的高能辐射机制研究对于揭示其结构和演化特征以及中央驱动之谜具有极其重要的意义。近十年来,随着活动星系核结构模型研究以及其高能连续谱观测的发展,解释活动星系核高能辐射的非热致电子级联模型得以产生、发展和完善起来。在本文中详细地评述了纯康普顿冷却情形的非热致电子级联模型的产生背景及目前的研究进展。另外,着重地综述了非热致电子级联模型的辐射转移处理以及热电子的康普顿散射处理等问题。最后评述了这一模型在解释活动星系核的高能辐射特征方面的优缺点。
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