Case(b）情况下NO的非弹性散射及 相关量子干涉的理解

我们已经对原子与双原子分子间的碰撞量子干涉进行了理论研究,为了对 分裂引起的碰撞诱导转动传能进行更一步的研究,建立了洪德情况b下原子双原子分子系统的理论模型.对洪德情况b下原子双原子分子系统干涉程度进行了讨论,并对洪德情况b下NO与He, Ne , Ar碰撞干涉角进行了定量计算。在含时一级波恩近似下,考虑各向异性相互作用势,定量分析转动量子数,实验温度等对干涉角的影响。     

电感耦合等离子体质谱法测定锆及锆合金中镉含量的质谱干扰分析

通过对Zr及Zr合金中各元素一定浓度单标溶液在电感耦合等离子体质谱(ICP-MS)设定的扫描区间(106~116aum)进行扫描得到质谱图,并结合各元素单标溶液在Cd元素不同同位素质谱峰处的离子计数值的分析,研究了ICP-MS测定Zr及Zr合金中Cd含量时所受的质谱干扰情况,并对干扰物进行了判断。结果表明:基体元素Zr、合金元素Nb和杂质元素Mo所形成的氧化物、氢氧化物多原子离子及合金元素Sn所形成的同质异位素均会对Cd的相关同位素原子构成质谱干扰;针对不同干扰,提出了避免和消除干扰可参考的方法。     

基于实时优化单光子干涉可视度的相位编码量子密钥分发

在相位编码量子密钥分发系统中,单光子干涉可视度决定了系统的成码率。本文提出一种优化单光子干涉可视度的方法,即利用遗传算法和四通道偏振控制器实时补偿单光子偏振漂移,同时利用时分复用参考光连续无复位地补偿单光子相位漂移,最终在25km光纤中实时优化的单光子干涉可视度达到98.6%,相位编码量子密钥分发系统成码率为2.2kbit/s。     

Removing the Destructive Quantum Interference in Cross Conjugation System by Structural Restraint

Understanding the quantum effect in the cross-conjugated system is of fundamental significance in molecular electronics. In this study, four molecules Xa-O, Xa, BP and BP-O were synthesized to investigate the destructive quantum interference(DQI) of a carbonyl bridge. The single-molecule conductance measured by the scanning tunneling microscope break junction(STM-BJ) technique demonstrates an increase in the conductance from molecule BP-O to molecule Xa-O as the cross-conjugated system is extended. Theoretical calculations show that the explicit DQI feature is presented in BP-O but absent in Xa-O, which indicates the removal of DQI in the restrained structures and results in the conductance enhancement in Xa-O.     

高压密闭消解-电感耦合等离子体质谱(ICP-MS)法测定土壤背景点样品中的29种元素

土壤环境背景值监测样品的检测工作特点是分析项目多、前处理方法和分析方法复杂,缺乏简便多元素同时测定的分析方法。采用氢氟酸-硝酸体系高压密闭消解方法处理土壤样品,采用ICP-MS法同时测定锂、铍、硼、锗、钼、银、镉、铟、锡、碲、锑、铯、镨、钕、钐、铕、钆、铽、镝、钬、铒、铥、镱、镥、钽、钨、铊、铋和铀元素。系统研究了不同消解体系、质谱干扰和消除方法并选择了合适的测定同位素,采用土壤标准物质对方法适用性进行了考察,29种元素的检出限在0.003~0.469 mg·kg-1之间,测定值的相对标准偏差在1.0%~9.3%之间,测定值与标准值的相对误差在-14%~17%之间。方法满足土壤环境背景值监测工作的测试需求,可实现一次前处理多元素同时测定,提高了工作效率。     

Simultaneous LIF and retro-reflected beam interference detection for CE

This Short Communication describes a novel optical detection method for CE, based on the combination of LIF detection and retro-reflected beam interference detection. By the use of a side-illuminated laser beam, an on-column multifunctional detection for CE has been developed, and some key elements in the scheme have been optimized. In addition, two miscellaneous samples including fluorescent dyes, carbohydrates and amino acids have been determined to evaluate its performance. Without any additional pretreatment, sufficient LOD and linear ranges have been achieved for most analytes. Its performance in retro-reflected beam interference detection is better than those mentioned in a former report, and its fluorescent sensitivity is comparable with the achievable sensitivity by conventional LIF systems, all of which together combine high sensitivity and universal analysis to a certain extent.     

Effect of pollution severity class and service year on corona characteristics and electromagnetic environment degradation of aged conductors

Corona discharge and electromagnetic environment on AC long-term operated conductors are important issues for extra-high-voltage transmission lines. To investigate the relation between conductor age and electromagnetic environment, including audible noise and radio noise, several groups of long-term operated conductors in China are selected for corona cage experiment. According to corona tests, corona discharge becomes more serious as the applied voltage improves. Difference of electromagnetic environment between conductors of different operated year increases. Corona discharge and electromagnetic noise become more serious as the service year lengthens. When the operated years are close, the general environment is important in electromagnetic environment degradation.     

离子束辅助沉积(IAD)镀制抗电磁干扰与减反射复合薄膜

在K9玻璃基底上将两种物理性能完全不同的薄膜形成组合膜系层,实现了抗电磁干扰、高透光的效果。技术指标为:在400nm-1100nm宽波段范围平均透光率不低于90%;为达到良好的抗电磁干扰屏蔽效果,抗电磁屏蔽其方块电阻值为4±0.5Ω/口。为满足设计技术指标要求,计算设计了抗电磁干扰与减反射复合膜系结构,进行了镀膜工艺实验。实验结果表明,通过采用离子束辅助沉积工艺技术,可改善光学薄膜的微观结构,进而提高了复合薄膜的光学、物理性能和膜层的稳定性。