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A rigorous method to solve the Bargmann-Wigner equation for an arbitrary half-integral spin is presented and explicit relativistic wavefunctions for an arbitrary half-integral spin are deduced. 相似文献
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The equivalence between the Bargmann--Wigner (B-W) equations and the
Klein--Gordon (K-G) equations for integral spin, and the Rarita--Schwinger (R-S) equations for half integral spin is established by explicit derivation, starting from the lowest spin cases. It is demonstrated that all the constraints or subsidiary conditions imposed on the K-G or R-S equations are included in the B-W equations. 相似文献
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After considering its mixing with the glueball, we give a new mass relation for the meson nonet. According to this mass relation and the predicted mass of the pseudoscalar glueball given by lattice calculations and the effective Hamiltonian, the expected mass of the mixed pseudoscalar glueball is about 1.7 GeV. This result is helpful in the experimental search for the mixed isoscalar pseudoscalar glueball. η(1760) is discussed as a possible candidate for this type of particle. 相似文献
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基于酸性条件下硅酸盐与钼酸铵反应生成硅钼黄后被还原成硅钼蓝的原理,借助微流控芯片平台,建立基于连续流动-分光光度法快速测定海水硅酸盐的分析传感器,传感器测定周期约为300 s,采用双光程方式拓展测量范围,线性测量范围可达0~400 μmol·L-1,双光程的检出限分别为45.1 nmol·L-1和1.6 μmol·L-1;当海水盐度大于15时,传感器测量准确度和稳定性基本不受盐度影响,且实际海水加标回收率在98.1%~104.0%之间。2015年11月在胶州湾开展了20个站点海试和同步比对试验,结果显示,该系统具有准确度高、简单、集成度高、水样消耗少、抗干扰能力强等优点,可用于海水原位硅酸盐的分析。 相似文献
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基于铌酸锂晶体的电控λ/2波片 总被引:1,自引:0,他引:1
利用有限元法分析了双面电板下铌酸锂晶体内部的电场分布。在规定匀强电场区域条件下,得到匀强电场区域大小随晶体宽度与电极宽度比值增大而增大的规律。在此基础上利用铌酸锂晶体的双横向普克尔效应设计了一种适用于任意光波长的电控λ/2波片。制作并测试了晶体宽度与电极宽度之比分别为2:1和3:1的电控铌酸锂λ/2波片,结果表明:这种波片可将一束线偏振的输入光转换成任意方向偏振的输出光,也可将任意偏振方向的输入光转换成固定方向偏振的输出光,并且晶体宽度与电极宽度比值越大,实验值与理论值符合得越好。 相似文献
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预制体是复合材料的增强骨架,由成千上万根纤维束织造而成. 预制体中的纤维束由于织造过程中的交织运动会发生不同程度的摩擦损伤,而纤维的磨损会导致预制体力学性能损失率高达9%~12%. 因此,揭示纤维束在织造过程中的摩擦磨损机理对提升预制体力学性能具有重要意义. 本文中综述了近年来有关纤维束摩擦行为的研究进展:首先,概述纤维束-金属和纤维束-纤维束摩擦测试方法的优缺点;其次,分析得出摩擦角度、摩擦频率、预加张力和法向载荷对纤维束摩擦性能的影响机制;最后,总结纤维束摩擦磨损行为的理论分析模型. 本综述中对复合材料预制体成形工艺设计和纤维束摩擦损伤的量化分析具有指导意义. 相似文献
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The interaction radius of a resonance is an important physical quantity to describe the structure of a resonance. But, for a long time, physicists do not find a reliable way to measure the magnitude of the interaction radius of a resonance. In this paper, a method is proposed to measure the interaction radius in physics analysis. It is found that the centrifugal barrier effects have great influence to physical results obtained in the PWA fit, and the interaction radius of some resonances can be well measured in the fit. 相似文献