客车设计——梦想和现实之间的距离

汽车作为人类重大发明之一经过了百年的发展,造型潮流代代更新,随着技术的发展,汽车也不再是一个简单的代步工具,而是综合了美学、空气动力学、能源学、机械学、材料学等多种学科的生活必需品.     

Photothermal effect for Fe3O4 nanoparticles contained in micelles induced by near-infrared light

Near infrared (NIR) light induced photothermal effect for Fe₃O₄ nanoparticles, contained in Pluronic F127 micelles, has been studied and it exhibits high photothermal converting efficiency. Heat is found to be rapidly generated in micelles containing Fe₃O₄ nanoparticles by NIR laser irradiation. Upon irradiation at 808 nm light and with mass concentration of Fe₃O₄ nanoparticles in 4 g/L, the micelle temperature increase is higher than 34°C for 10min irradiation. The maximum temperature of micelles containing Fe₃O₄ nanoparticles in 4 g/L reaches 62°C.     

双频发电机组永磁自动离合器设计

针对双频发电机组和具有变频功能的发电机组离合器存在典型故障,剖析了存在问题的原因,应用动力学、磁力学、材料学等多学科知识,设计了永磁自动离合器,并在12SF型双频发电机组中应用,达到设计要求.     

学会动态

我会举办"广东地区造船焊接与切割技术研讨会"2007年12月26日,我会主办、广州日松工业自动化有限公司协办、广东造船工程学会工艺材料学组承办的"广东地区造船焊接与切割技术研讨会"在广州日松工业自动化有限公司召开。来自广州日松工业自动化有限公司、广州广船国际股份有限公司、广州文冲船厂有限责任公司、广州中船黄埔造船有限公司、荷兰HGG公司、中海工业城安围船厂、中海工     

Microwave hydrothermal synthesis and characterization of ZnO nanostructures in aqueous solution

ZnO nanostructures were prepared in aqueous solution by microwave hydrothermal synthesis. Xray diffraction (XRD) and field emission scanning electron microscopy (FESEM) were used to characterize ZnO nanostructures (ZNs). The effects of pH, reaction temperature and reaction time on yield of ZnO were investigated. The yield of ZnO increased significantly with the increase of pH value, reaction temperature and reaction time. High yield and well crystallinity of ZNs could be obtained at 120°C for 60min by microwave hydrothermal synthesis. The spherical and rugby-like ZNs were obtained at 120°C without triethanolamine (TEA) and with TEA (mass ratio, $r = m_{Zn^{2 + } }$ : m _TEA = 1: 1), respectively. The concentration of Zn(OH) ₄ ^?2 ions in the reaction solution and TEA had an important effect on the nucleation and morphology of ZnO nanostructures. Mechanism for the formation of ZnO nanostructures was proposed.     

中国汽车工程学会材料分会第十届理化检测、失效分析学术交流会通知

汽车材料学会理化检测、失效分析专业学组拟于2011年5月中下旬召开第十届学术交流会。会议内容如下。     

Composition-dependent mechanical and thermal transport properties of carbon/silicon core/shell nanowires

Molecular dynamics (MD) simulations are performed to study the composition-dependent elastic modulus and thermal conductivity for carbon/silicon core/shell nanowires (NWs). For each concerned carbon/silicon core/shell NW with a specified diameter, it is found that elastic modulus is reduced with a linear dependence on cross-sectional area ratio. The fact matches well with the results of theoretical model. Analysis based on the cross-sectional stress distribution indicates that the core region of core/shell NW is capable of functioning as a mechanical support. On the other hand, thermal conductivity also relies on the cross-sectional area ratio of amorphous silicon shell. The core/shell interface plays a considerable influence on the thermal transport property. The decreasing rate of thermal conductivity is gradually decreased as the composition of amorphous silicon shell increases. In addition, by calculating the phonon density of state, we demonstrate that the reduction in thermal conductivity of the core/shell NW stems from the increase of the low frequency modes and the depression of high-frequency nonpropagating diffusion modes. These results provide an effective way to modify the properties of core/shell NWs for related application.     

2010年全国冶金物理化学学术会议

会议背景介绍:由国家自然科学基金委员会工程与材料学部、中国金属学会冶金物理化学分会、中国有色金属学会冶金物理化学学术委员会、中国稀土学会联合主办的"2010年全国冶金物理化学学术会议"定于2010年4月在     

斯堪尼亚如何设计卡车？

卡车造型设计，是根据卡车整体设计的多方面要求来塑造最理想的车身形状。卡车造型设计不是对卡车的简单装饰．而是运用艺术的手法、科学地表现卡车的功能、材料、工艺和结构特点。为卡车造型提供支持的是个十分苛刻的学科，要求设计师拥有从设计到制造整个过程的知识。熟悉车身结构、制造工艺要求、空气动力学、人机工程学、工程材料学、机械制图学、声学和光学知识，并且要求设计师既要有远见．又要有科学性。他们需要能促进创造力，同时又能保证设计出的产品具有可制造性。