瑞宁移液器达人全国挑战赛拉开战幕

瑞宁移液器达人全国挑战赛自2月启动以来,从华东,华北,华南再到华中及华西已累计举办十余场!在各赛区现场,不仅有Rainin专业人员对比赛选手进行良好移液操作的指导,也有专业校准人员     

直接电位分析法的定位校准和斜率校准

本文阐述了直接电位分析法定位和斜率校准的理论与测量原理。Eemf pM标准曲线法不必考虑定位和斜率校准问题 ;单点定位pMX 直读法 ,只进行定位校准 ,没有完全校正电极理论与实际斜率不一致所产生的测量误差 ;双点定位pMX 直读法在pMS1～pMS2 之间同时进行定位与斜率校准 ,测量的相对误差较小     

金属衬底上石墨烯的红外近场光学

对石墨烯/铜体系开展了系统性的近场光学实验研究,成功观测到了区别于铜衬底的、来自石墨烯的近场光学响应信号,发现在表面台阶几何参数相同的铜衬底上的不同石墨烯样品表现出了截然不同的近场光学响应.     

Special issue on conveying and handling of particulate solids–Challenges of discrete element simulation,application and calibration

<正>A series of international Conveying and Handling of Particulate Solids(CHoPS)conferences was initiated in Herzliya,Israel in 1995and has since proceeded with six successive conferences held in Jerusalem(1997),the Dead Sea(2000),Budapest(2003),Sorrento(2006),Brisbane(2009)and Friedrichshafen(2012).The conference series covers processes involving particulate solids,for example     

Effect of coating thickness on the calibration and measurement uncertainty of a wide-band liquid crystal thermography

<正>The liquid crystal thermography is a high-resolution and non-intrusive optical technique for full-field temperature measurement.We present detailed calibration data for a wide-bandwidth thermochromic liquid crystal(TLC) to investigate the effect of the coating thickness on the hue-temperature characteristics and the measurement uncertainty of the TLC.It is found that the coating thickness has appreciable effect on the TLC hue-temperature curve.For TLC coatings with the thickness over 20μm,a thicker TLC coating shows a relatively smaller measurement uncertainty,but the effect of the coating thickness is non-distinctive on the measurement uncertainty.     

近场接收时颗粒的消光特性

讨论了在近场接收条件下颗粒的消光特性。计算表明：在近场接收时，颗粒的实际消光将性与远场接收相比，存在很大的区别－－实际消光纱数不但同颗粒的性质和大小有关，而且与颗烊在光束中的位置相联系。对于大颗粒，近场间的消光系数在数值上也有很大差异，如果采用近场接收来测量颗粒的大小，必须考虑这些因素的影响，否则将极大增加测量误差。还论述了近场接收时消光法测量颗粒时测量区定义中的问题，论证了如何能恰当定义测量区，     

Calibration and Monte Carlo simulation of a single-photon counting charge-coupled device for single-shot X-ray spectrum measurements

A Princeton Instruments PI-LCX 1300 charge-coupled device （CCD） camera used for X-ray spectrum measurements in laser-plasma experiments is calibrated using three radioactive sources and investigated with the Monte Carlo code Geant4. The exposure level is controlled to make the CCD work in single photon counting mode. A summation algorithm for obtaining accurate X-ray spectra is developed to reconstruct the X-ray spectra, and the results show that the developed algorithm effectively reduces the low-energy tail caused by split pixel events. The obtained CCD energy response shows good linearity. The detection efficiency curves from both Monte Carlo simulations and the manufacturer agree well with the experimental results. This consistency demonstrates that event losses in charge collection processes are negligible when the developed summation algorithm of sDlit Dixel events is emDloved.     

基于改进型近场动力学方法的混凝土梁破坏分析

基于非局部近场动力学(PD)理论,在常规微弹脆性(PMB)本构模型基础上,引入能够反映物质点间作用强度随物质点间距变化规律的核函数修正项,以提高PD方法的定量计算精度;并通过附加物质点转动自由度建立以双参数描述的PD微极模型,突破了常规单参数PMB本构模型的泊松比限制等缺陷。通过引入动态松弛算法和粒子系统失衡力准则等系列数值算法,构建了能够自然模拟准脆性裂纹扩展全过程的PD算法体系。经典悬臂梁挠度曲线计算结果表明,本文模型和算法的定量计算误差小于3.5%,对含切口三点弯梁的裂纹扩展过程模拟结果与试验结果吻合。通过改变加载位置和初始裂纹位置,对三点弯梁的破坏模式和承载能力进行了分析。结果表明,裂纹始终由初始裂纹位置向加载位置扩展,且初始裂纹位置和加载位置越靠近三点弯梁中部时,结构的承载能力越低。     

光散射中的anapole态：理论、结构以及应用

光散射中的anapole态是纳米光子学领域的一种独特的光学现象，可以用Mie理论以及多极展开理论进行分析。对于最常见的一阶电anapole态，其可以看做是由笛卡尔坐标系下电偶极矩和环偶极矩的干涉相消产生，具有典型的远场散射抑制和近场增强性能。本文首先对anapole态的基本概念和理论进行阐述，其次对激发anapole态的微纳结构进行总结，最后结合anapole态独特的光学特性，对其在近场增强、非线性光学、激光等方面潜在的光子学应用和最新研究进展进行了讨论和展望。