电解法微量溶解氧分析仪校准装置的研制

基于法拉第电解定律研制电解法微量溶解氧分析仪校准装置。利用理论计算确定校准装置的技术指标及水中微量溶解氧浓度的不确定度,经与比色法比对,该装置用于校准微量溶解氧分析仪的可行性得到验证。     

Pair Production in Chromoelectric Field with Back Reaction

Massless quark pair production in SU(2) gauge chromoelectric field is investigated by solving the Wigner function with back reaction. The temporal evolution of specific field and its current are obtained self consistently. For the quark distribution function, both its time and momentum dependence are studied. In particular, some interesting phenomena are found, for example, the more abundant symmetry or/and antisymmetry characteristics, the existence of the attractive basin structure and the existence of the momentum "gap" in the quark distribution and so on. All the phenomena are associated with the quark-gluon plasma oscillation, which due to the back reaction effect. The study and analysis qualitatively about the components of the Wigner function are expected to be helpful to deepen the understanding of the QCD vacuum.     

Fourth-Order Spatial Correlation of Thermal Light

We investigate the fourth-order spatial correlation properties of pseudo-thermal light in the photon counting regime, and apply the Klyshko advanced-wave picture to describe the process of four-photon coincidence counting measurement. We deduce the theory of a proof-of-principle four-photon coincidence counting configuration, and find that if the four randomly radiated photons come from the same radiation area and are indistinguishable in principle, the fourth-order correlation of them is 24 times larger than that when four photons come from different radiation areas. In addition, we also show that the higher-order spatial correlation function can be decomposed into multiple lower-order correlation functions, and the contrast and visibility of low-order correlation peaks are less than those of higher orders, while the resolutions all are identical. This study may be useful for better understanding the four-photon interference and multi-channel correlation imaging.     

红外导引头整流罩技术研究

从材料选择和整流罩设计两方面,介绍了如何解决高速红外导引头整流罩问题.针对高速红外成像导引头使用环境的要求,分析了整流罩材料选择应考虑的因素.通过比较材料的透过率、硬度、抗弯强度和热膨胀等性能参数,得出尖晶石是较理想的高速导弹整流罩材料,其机械性能和光学性能良好,易于制备,并已取得成功应用;红外玻璃特别适合大尺寸和复杂形状制备.为了减小整流罩气动加热效应,分析了解决气动加热问题的途径,提出可通过镀金刚石膜、信号处理、共形设计等技术来减小影响,并简要介绍共形整流罩设计原理和制造.     

两模腔场谱间的量子干涉

研究了高Q腔中单个二能级原子与两模二项式光场依赖强度耦合相互作用系统的腔场谱,给出了弱初始场条件下的数值结果,讨论了两模光场之间的量子干涉对腔场谱结构的影响. 发现当两模光场的频率差Δ>g（g为原子与腔场间的耦合常数）时,两模光场间的干涉效应对谱结构没有影响,系统的腔肠谱只是两模腔肠谱的简单叠加;当Δ≤g时两模腔场谱间的干涉比较明显. 在强初始场条件下,量子干涉效应可忽略. 关键词： 腔场谱 量子干涉 两模二项式光场     

Kerr效应对非线性J-C模型辐射谱的影响

研究了Kerr介质腔中非线性J-C模型的辐射谱.导出了双模初始光场处于任意量子态时辐射谱的计算公式,给出了光场处于数态、相干态和压缩真空态时的数值结果,讨论了Kerr效应和初始场强对辐射谱的影响.发现在光子数态的情况下,Kerr效应使低频峰增强、高频峰减弱,并使各峰向右移动.在初始腔场为较强的相干态时,原子辐射谱明显地分成两个拱形的梳状峰群,Kerr效应的增强使左侧峰群增高,右侧的边峰受到抑制.在压缩真空态情况下,边带峰只出现在中心频率双峰的左侧,随Kerr效应和初始场的增强,边峰个数也随之增多.无论哪种情况都破坏谱结构的对称性,在强场条件下Kerr效应的影响更加显著.     

The Interaction of Peregrine Solitons

We theoretically investigate the interaction of two in-phase and out-of-phase Peregrine sofitons in a Kerr nonlinear medium, addressing both the cases of first- and second-order solitons. Upon adjusting the interval between the sofitons, their interactions exhibit different properties. If the interval is sufficiently large, two Peregrine sofitons will propagate individually and will not interact each other. However, if the interval is not very large, the Peregrine solitons will strongly interact and display varying behavior.     

水体中环氧氯丙烷监测方法研究进展

介绍环境水体中的环氧氯丙烷监测分析方法及相关的研究进展。相关文献显示,用盐酸溶液（1+1）酸化样品有利于样品保存,采用全自动吹扫捕集处理技术,对吹扫时间、温度、色谱柱和检测器等参数进行优化。如吹扫时间设定为13 min,吹扫温度设定为35℃,经DB-624毛细管色谱柱分离,质量选择检测器进行检测,可以更好实现对水体中痕量环氧氯丙烷的富集、解析和检测。在各种环氧氯丙烷的测定方法中,选择吹扫捕集–气相色谱和质谱联用法,可实现全自动的样品前处理,其高效而且不用接触有机溶剂,检测方法步骤简单、准确性高、选择性好,在水质环氧氯丙烷测定方面具有广阔的应用前景。     

流强探测器发热分析及改善方法（英文）

BEPC Ⅱ新参量流强探测器在束流高流强对撞模式下存在严重发热问题。为了稳定和精确的测量,对可能的发热原因进行了综合讨论,针对真空盒发热问题利用CST进行尾场模拟,以本征模计算得到稳态温度分布。对探测器发热问题利用等效的反射阻抗计算方法得到陶瓷狭缝的截止频率,从而有针对性地提出了实用的解决方案并得到了理想的实验结果。实验基本解决了BEPC Ⅱ探测器的发热问题,对今后流强探测器的改进和未来流强探测器的研发和设计有指导意义。     

Kerr效应对原子与双模场Raman相互作用模型腔场谱的影响

研究了含Kerr介质高Q腔中单个二能级原子与双模量子化光场发生Raman耦合过程的腔场谱,给出原子初态处于基态而初始光场为数态时的数值结果.发现在一般情况下,两模腔场谱均为双峰结构.Kerr效应对真空场谱结构无影响.在弱场条件下,Kerr效应的增强会导致各模高频峰明显增高,而低频峰明显降低;在强场条件下,各峰峰位都随着Kerr效应增强明显右移,谱结构整体偏离原共振频率.