A non contact three dimensional measurement method is presented in this paper.This system consists of a laser triangulation probe,a probe head and a coordinate measuring machine (CMM).The measurement principle of th...A non contact three dimensional measurement method is presented in this paper.This system consists of a laser triangulation probe,a probe head and a coordinate measuring machine (CMM).The measurement principle of the system is discussed,and a system calibration method employing a reference ball is proposed.The geometric model involving four frames is established to calculate the data points based on the reading of the laser probe and position information from the CMM.A measuring experiment for gesso free form surface using this system is carried out.展开更多
研究了三辊斜轧穿孔法生产Φ50 mm×5 mm TA2管坯的生产工艺。通过TA2棒坯不同加热温度对穿透率的影响、不同径向压下量对穿孔后管坯直径的影响、穿孔头尺寸对管坯壁厚的影响、棒坯直径与管坯直径关系的研究,确定了三辊斜轧穿孔法...研究了三辊斜轧穿孔法生产Φ50 mm×5 mm TA2管坯的生产工艺。通过TA2棒坯不同加热温度对穿透率的影响、不同径向压下量对穿孔后管坯直径的影响、穿孔头尺寸对管坯壁厚的影响、棒坯直径与管坯直径关系的研究,确定了三辊斜轧穿孔法生产纯钛管坯的具体工艺参数：棒坯规格Φ48 mm,棒坯加热制度930~950℃/40~50min,顶头前探量26~32 mm,径向压下量15%~20%。展开更多
依据对虾黄头病毒（Yellow head virus,YHV）的非结构蛋白N基因序列,设计特异的锁式探针（Padlock probe,PLP）、检测探针及引物,建立YHV超分支滚环扩增（Hyper-branched rolling circle amplification,HRCA）检测试纸。灵敏度实验显示,...依据对虾黄头病毒（Yellow head virus,YHV）的非结构蛋白N基因序列,设计特异的锁式探针（Padlock probe,PLP）、检测探针及引物,建立YHV超分支滚环扩增（Hyper-branched rolling circle amplification,HRCA）检测试纸。灵敏度实验显示,YHV HRCA检测试纸能检测出的最低模板量为101拷贝,是RT-PCR灵敏度的100倍。特异性实验结果表明,该试纸能够特异性地对YHV进行检测。利用该检测试纸对进出口80批次虾样本进行检测,并将检测结果与常规RT-PCR相比较,结果显示,YHV HRCA检测试纸灵敏度方面优于常规RT-PCR方法,且操作简便、结果直观易读。展开更多
基金Supported by"863"High Technology Development Comittee ofChina (No."863"- 51 1 - 942 - 0 2 4 ) National Natural Science Foun-dation of China (No.50 0 750 64)
文摘A non contact three dimensional measurement method is presented in this paper.This system consists of a laser triangulation probe,a probe head and a coordinate measuring machine (CMM).The measurement principle of the system is discussed,and a system calibration method employing a reference ball is proposed.The geometric model involving four frames is established to calculate the data points based on the reading of the laser probe and position information from the CMM.A measuring experiment for gesso free form surface using this system is carried out.
文摘依据对虾黄头病毒（Yellow head virus,YHV）的非结构蛋白N基因序列,设计特异的锁式探针（Padlock probe,PLP）、检测探针及引物,建立YHV超分支滚环扩增（Hyper-branched rolling circle amplification,HRCA）检测试纸。灵敏度实验显示,YHV HRCA检测试纸能检测出的最低模板量为101拷贝,是RT-PCR灵敏度的100倍。特异性实验结果表明,该试纸能够特异性地对YHV进行检测。利用该检测试纸对进出口80批次虾样本进行检测,并将检测结果与常规RT-PCR相比较,结果显示,YHV HRCA检测试纸灵敏度方面优于常规RT-PCR方法,且操作简便、结果直观易读。
