多层透明薄膜切痕视觉检测方法与实现

针对精确非连续输送工况下多层结构透明薄膜半切切痕检测的需求,提出了一种基于暗场照明的视觉系统设计方案。采用两组平行光以低角度入射使切痕获得均匀光照,通过CCD获取薄膜反射与漫射所形成的清晰图像,直线拟合出的切痕即可用于评定薄膜输送的定位精度,并计算出下次进给步长的补偿值。该方案达到了多层透明膜精确非连续输送中定位检测的目的,结构简单,便于实现,已用于燃料电池膜电极生产装备中。     

微织构刀具正交切削Ti6Al4V的试验研究

仿生摩擦学的出现,为刀具减摩技术提出了新的研究方向,通过钛合金的正交切削试验研究了表面微织构刀具在微量润滑和无润滑剂条件下的减摩性能.结果表明：表面微沟槽在润滑剂条件下可以有效地改善刀屑之间的摩擦,降低切削力与切削温度,同时表面微沟槽还可以改善钛合金的粘结现象;在无润滑剂条件下,微沟槽依然具有一定的＂润滑＂作用.     

半导体晶体线锯切割工艺研究

线锯切割技术在半导体晶体切割领域已经得到了广泛应用。对传统内圆切割技术进行了介绍,并针对新兴线锯切割技术的现有分类和研究水平做了总结,阐述了自由磨料线锯切割和固结磨料线锯切割两大类别的工作原理和研究进展。自由磨料线锯切割是取代内圆切割的一种广泛技术,而固结磨料线锯切割则是针对高切割效率要求的重要改进。针对晶体线锯切割技术所做的综述,有助于研究者了解前沿研究进展,把握晶体线锯切割的发展方向。     

直读光谱法测定析出锌中铅、铜、铁、镉、锡、铝的含量

研究了湿法冶炼产出的析出锌,经过冲床冲压脱模、马弗炉高温熔化、模具浇铸成型、车床切削等过程,于直读光谱仪上测定析出锌中铅、铜、铁、镉、锡、铝含量的方法.通过实验确认了仪器的工作条件、熔样器皿、熔样温度、析出锌取样位置,并对熔样铸锭后铅、铜、铁、镉、锡、铝的偏析情况进行了分析,铅最大偏差达到30％,经玻璃棒搅动后保温,铅...     

Differential distribution of phytochemicals in Scutellariae Radix and Scutellariae Amoenae Radix using microscopic mass spectrometry imaging

Scutellariae Radix, the root of Scutellaria baicalensis Georgi, is widely applied in China for the treatment of fever, ulcer, bronchitis, hepatitis and inflammatory symptoms. Sctuellariae Amoenae Radix, the root of Scutellaria amoena C.H. Wright, is often prescribed as the substitute for Scutellariae Radix. Up to now, no attempt has been made to unveil and compare the localization of phytochemicals in Scutellariae Radix and its succedaneum. This investigation succeeded to look into the differential distribution of natural compounds in Scutellariae Radix and Scutellariae Amoenae Radix using microscopic mass spectrometry imaging. Compounds presenting different distribution modes in two kinds of roots were sorted out, then a quick method for the differentiation between Scutellariae Radix and Scutellariae Amoenae Radix was established. Accumulation sites of baicalein, baicalin, wogonin and wogonoside in Scutellariae Radix were also uncovered using microscopic mass spectrometry imaging. Moreover, the application of matrix assisted laser desorption ionization-quadrupole-time of flight mass spectrometry allowed the on-tissue dissociation of major flavonoids. Overall, the utilization of microscopic mass spectrometry imaging and matrix assisted laser desorption ionization-quadrupole-time of flight mass spectrometry provided a novel perspective for the discovery of natural compounds within medicinal plants.