Electromagnetic waves can be described as the gradient of a potential,and will therefore have zero curl.Recently(e.g.Johannes Courtial,Glasgow University)has been able to construct optical elements th
Transmission is one of the most important parameter for optic materials which should be measured carefully as its value is related to optic design and optic material manufacture.Commonly,an optic syst
The Ⅲ-Ⅴ nitride material such as InN GaN has many favorable physical properties including a wide direct band-gap(0.7-3.4eV),high absorption coefficients(105cm-1),and high radiation resistance.InGaN ha
A new manufacture technique of micro-lens solidified on needing positions dynamically using optic glue is suggested.It is formed directly on positions where the micro-lens needs to be mounted.This tec
With the development of lighting technology,high-power white LEDs will become the future mainstream technology.At present,there are still many problems in optical stability,reliability,heat dissipatio
A high precision radius automatic measurement method using laser differential confocal technology is proposed.Based on the property of an axial intensity curve that the null point precisely correspond
一般来说,测试样品中含有自由基会影响核磁共振谱仪的匀场甚至锁场,从而导致所测谱峰峰型很乱甚至是无法分辨,因此利用顺磁共振技术是定性检测自由基时研究人员的常用选择.然而在一定条件下,利用核磁共振方法研究有自由基所参与的反应却有着独特的直观的优势.
电子自旋共振(ESR)波谱研究反应动力学已经被广泛应用在有机化学[1,2]、自由基聚合[3-6]和生物体系[7-11]中.我们希望找到一种无损的动力学研究方法来研究反应中金属的变化,并且了解在反应中金属是如何作用的.
采用提拉法生长了Mn:YAG和Ce,Mn:YAG单晶,详细研究了Ce,Mn掺杂浓度对光学性质的影响,优化了Ce,Mn掺杂浓度,并与蓝光芯片组合进行了白光LED光源性能的研究,通过XRD、吸收光谱、荧光光谱对Mn:YAG和Ce,Mn:YAG单晶的晶相、光学特性进行了详细研究,采用电子顺磁共振谱(EPR)对样品内部掺杂离子的价态及配位结构进行了分析,利用LED快速光谱辐射计对所封装的LED光源的光电参
天然气水合物是在一定条件下(合适的温度、压力、气体饱和度、盐度等),由水和气体分子(以甲烷为主)组成的类冰状的笼形结晶化合物.天然气水合物是一种重要的潜在资源.其碳含量相当于全世界已知煤炭、石油和天然气总储量的2 倍[1],可能成为21 世纪的新型能源.