柔性机构的抽象

随着高性能材料的不断出现和发展,柔性机构因其独特的优点,将得到越来越广泛的应用,相应地人们对柔性机构的研究也将越来越深入、普遍。为了便于研究和交流,归纳了国际上关于柔性机构的一些规范的术语、名称和图示。     

切屑折断过程及槽型CAD专家系统知识库的设计

针对机械加工中切屑处理问题,研究了切屑折断过程及槽型ＣＡＤ专家系统的总体设计,知识表示模式及知识库的设计与实现方法。该系统不仅可以实现折断判断、断屑范围,刀片参数选择等咨询工作,还能根据用户要求设计刀片槽型,为进一步研究切屑折断过程提供了依据。     

Properties and convergence analysis of FM<Superscript>m</Superscript>let transform

The linearity, time shifting, time scaling, and time inversion properties of FM^mlet transform are proved, and the frequency shifting property of one of the subspaces of FM^mlet transform, namely the chirplet transform is presented. Moreover, it is proved that in the process of FM^mlet based atomic signal decomposition, the residual signals decay exponentially.     

一种新的主应力分离法在有挡锚链环应力分析中的应用

本文从平面应力状态的应力平衡方程式和应力的调和方程出发，导出正应力的和与差与剪应力之间的关系．在此基础上得到了只使用主要横截面及其附近的等差线，并且不管试件形状如何，能容易地分离主应力的方法。并以Ａ２级２８有挡锚链为例进行了计算，并与其全息光弹结果进行了比较．     

导航专用处理器的研究

讨论了坐标旋转处理器算法的推导过程，论述了基于座标旋转处理器算法的导航专用处理器设计方法并提供了总体设计方案。     

新型的CAD／CAM人机接口的研究

集中讨论了ＣＡＤ／ＣＡＭ系统人机交互的特点，抽象出完整的接口模型，并以此为基础实现了接口开发工具的设计，提高了软件的开发效率。     

Influence of flow control devices on metallurgical effects in a large—capacity tundish

The influence of flow control devices on metallurgical effects in large-capacity tundish has been studied carefully with elements tracing,sampling and theoretical prospecting,The results from the studies are(1) in the continuous casting of clean steel,bad control of tundish operation may deteriorate the cleanliness of steel;(2) the cleanliness of steel is deteriorated mainly at the unstady state;(3) large amount of macro inclusions come from the top slag and the refractory of tundish;(4) installing dam and weir can improve the cleanliness of steel and lighten the influence of steel fluctuation;and (5) the result of theoretical calculation suggests that the inclusions larger than the critical size of 92.6um can be floated out from the tundish bath completely.     

高剂量Ge离子注入直接形成nc-Ge的研究

报道了分别采用剂量为1e1 6 ,1e1 7,5e 1 7和1e1 8cm- 2的高剂量Ge离子注入,不需退火即可在Si O2中直接形成Ge纳米晶的新现象.采用掠入射X射线衍射和激光喇曼谱等实验手段对样品进行了物相分析.结果表明,高剂量Ge离子注入可在SiO2 薄膜中直接形成Ge纳米晶(nc- Ge) ;非晶态Ge向晶态Ge发生相变的阈值剂量约为1e1 7cm- 2 ,离子注入直接形成的nc- Ge内部具有较大压应力,随着注入剂量的提高,nc- Ge的尺寸和含量均有提高.对纳米晶形成机理的研究认为,在Ge离子注入剂量达到阈值,此时膜中Ge非晶态团簇浓度达到饱和甚至过饱和,新入射的     

Effect of solid‐state shear milling on structure and properties of HDPE/UHMWPE blends

The structure and properties of HDPE/UHMWPE blends prepared through a pan‐milling reactor in solid state at ambient temperature were compared with the blends made by melt mixing. The changes of structure and properties of the blends were investigated by FTIR, melt flow index, mechanical properties, dynamic rheological measurement, DSC, and WAXD. DSC measurement illustrated that after pan‐milling treatment, the half‐width of the melting temperature became smaller. The more content of UHMWPE added in the blend, the more evident change was observed. Combined with the dynamic rheological analysis, it was proved that, the pan‐milling treatment can improve the compatibility of the HDPE/UHMWPE blends. X‐ray diffraction analysis showed that after pan‐milling treatment some ordered structure could be induced, but after heat treatment, the induced crystalline structure disappeared. The tensile properties of pan‐milled HDPE/UHMWPE blends also achieved improvement after pan milling treatment. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39916.     

枯草芽孢杆菌Dg5041液体发酵生产γ-聚谷氨酸

以枯草芽孢杆菌Dg5041为生产菌,对其摇瓶发酵生产γ–聚谷氨酸(γ-PGA)的工艺进行研究,通过单因素实验和正交实验获得了该菌的优化培养条件。优化的培养基组成为:葡萄糖35 g/L,酵母膏10 g/L,谷氨酸钠40 g/L,MgSO41.0 g/L,K2HPO4 2.0 g/L,MnSO40.5 g/L,pH 7.0,250 mL锥形瓶装液量50 mL。菌种在37℃,120 r/min培养24 h加入5%NaCl后继续培养24 h,γ-PGA产量达到18.54 g/L。研究结果表明,枯草芽孢杆菌Dg5041是一株很有潜力的γ-PGA高产菌。