安装状态对扭矩扳子检定结果的影响

针对日常使用及检测扭矩扳子的过程中发现的不同安装状态对被检扭矩扳子的示值误差影响很大这一问题,通过大量的试验数据和经验数据相结合的方法,客观评估安装状态对扭矩扳子测量结果的影响。其中,扳手的水平安装状态及安装同轴度对检定结果影响较大。文章旨在帮助检定测试人员得到相对准确的数据。     

Reproducibility in Surface-Enhanced Raman Spectroscopy

Surface-enhanced Raman spectroscopy（SERS） is an intense ongoing hot topic because it is an attractive tool for sensing or detecting molecules in trace amounts. Despite its high specificity and sensitivity, the SERS technique has not been established as a routine analytic method most likely due to the low reproducibility of the SERS signal. This review considers the influence factors to produce the poor reproducibility during the SERS measurement. This review starts with the discussion of calculation of surface-enhanced Raman intensity in order to explain the reason why it is so difficult to achieve a high reproducibility of SERS measurement from the origin of enhancement mechanism. Then we focus on the fabrication of SERS substrates generally including two types：① single particles and ② arrays on substrate that are directly used to detect molecules or other components.In addition, we discuss the molecule factors and optical system for the reproducibility for sample-to-sample or spot-to-spot on a substrate. In the final part of this review, some effects resulting in the irreproducibility of Raman bands＇ position from recent literatures are discussed.     

车载式落锤弯沉仪在公路工程检测中的应用技术分析

落锤式弯沉仪是目前世界上比较先进和快捷的弯沉无损检测设备。应用分析表明:落锤式弯沉仪与贝克曼梁两者的检测结果有良好的相关性,能对路基路面的承载能力进行准确反映和正确评价。     

车载式落锤弯沉仪在公路工程检测中的应用技术分析

落锤式弯沉仪是目前世界上比较先进和快捷的弯沉无损检测设备。应用分析表明：落锤式弯沉仪与贝克曼梁两者的检测结果有良好的相关性,能对路基路面的承载能力进行准确反映和正确评价。