Measurement of Shear in a Lateral Shearing Interferometer

We analyze the influence of error in the measurement of shear value, which is a major source of error in tested results by the lateral shearing interferometer. A novel method is proposed for accurately measuring the shear of this interferometer. By introducing a defocused wavefront and making use of the wavefront slope data of the defocus and the parameters of the interferometer, we can calculate the shear value precisely, with an error less than the sampling interval of the detector. An experiment was conducted to show the effectiveness of the method.     

石墨炉原子吸收光谱法测定食品添加剂磷酸氢二铵中的铅含量

采用石墨炉原子吸收光谱法（GF．AAS）测定食品添加剂磷酸氢二铵中的铅含量,并且对样品中铅的线性范围、检测限、回收率和精密度进行了分析[1]。结果表明,在本实验条件下,铅的最低检测限为O．0082μg／g,线性回归方程为y=0．0091x＋0．00619,线性系数为0．9999,样品回收率都在97％以上。在采用同样前处...     

基于曲边梯形面积刻画毕达哥拉斯模糊数的排序方法

毕达哥拉斯模糊集（Pythagorean fuzzy set,PFS）是传统直觉模糊集（intuitionistic fuzzy set,IFS）的扩展,能在更广泛区域处理多属性信息决策问题。首先,针对某文献毕达哥拉斯模糊数（Pythagorean fuzzy number,PFN）排序方法存在的错误,分析了其产生原因。其次,在毕达哥拉斯模糊环境下,基于可靠信息量所对应的曲边梯形面积（curved trapezoidal area,CTA）提出了新的得分函数公式,进而给出了PFN的排序准则,并讨论了该得分函数的基本性质。最后, 用实例说明给出的排序方法克服了其他方法的某些缺陷,具有一定优势。     

Depth of focus estimation based on exposure dose distribution

A defocusing exposure dose distribution model is established with the integral effect of light intensity on time taken into account for laser direct writing on a thin photoresist with total reflection substrate. Exposure dose distribution curves are established using the established model for different photoresist depths. A side slope angle is established for each defocusing amount in accordance with the exposure dose distribution curves, and so depth of focus can be estimated by simply checking to see if the maximum side slope angle with the horizontal is in the range of 80-100°. Simulation results indicate that when laser direct writing is done on a thin photoresist with total reflection substrate using a laser with wavelength equal to 442 nm and a lens with numerical aperture equal to 0.5, the depth of focus estimated using the proposed method is 1 μm, which is just 1/3 of the depth of focus estimated using the method based on intensity distribution. It is therefore concluded that it is the integral effect of light intensity on time that causes the depth of focus estimation error, and the proposed method can be used to achieve a more accurate depth of focus estimation compared to the intensity distribution based method.     

Decoherence Effect and Beam Splitters for Production of Quasi-Amplified Entangled Quantum Optical Light

We let a set of beam splitters of vacuum mode with a chosen transmittance parameter η in interaction with a separable coherent states.This model induces the production of an attenuated quantum channels based on entangled optical states.Indeed,the decoherence effect is exploited positively here to generate such kind of quantum channels.Next,the amplitude damping and the entanglement amount of these produced channels are enhanced thereafter by a probabilistic quasi amplification process using again a 50 : 50 beam splitter.     

高空核爆电磁脉冲波形标准及特征分析

目前,国际上已有美军标、国际电工委员会、Bell实验室及各种学术出版物等各种高空核爆电磁脉冲波形标准。综述了这些标准,并从时域参数、频谱、归一化累积能流谱、总的能量密度等几方面研究其异同性。比较后认为,IEC61000-2-9和MIL-STD-461E表述的新标准要比1976年出版物波形和Bell实验室波形的频谱范围宽,对电子系统的小孔缝耦合效应稍强,但对多数效应物尤其是线缆引入的传导耦合,损伤程度则相对弱化。最后,分析了由于HEMP波形表述形式变化,给EMP模拟器和效应研究带来的影响和新动态趋势。     

顶空气相色谱-质谱法测定ABS塑料玩具中丙烯腈和苯乙烯的残留量与迁移量

该文建立了ABS塑料玩具中丙烯腈和苯乙烯两种单体残留量与迁移量的顶空气相色谱-质谱测定方法.首先对残留量测定方法的顶空平衡时间和平衡温度进行了优化,然后以模拟汗液和模拟唾液为迁移基质,对迁移量测定方法的顶空平衡时间、平衡温度、取样体积和盐析条件进行了优化,并将其应用于市售38件ABS玩具实际样品的检测.结果显示:残留量...