液—液两相旋流分离的研究

1前言在两相分离中，液一液两相的分离是最困难的。主要是两相密度差较小且物性较为接近，在多相流体手册山等理论参考书中尚没涉及到液一液分离这个领域，随着近海及海上油田的开发生产及环保的要求，人们对油水二次分离提出了更高要求，工业上油水分离多采用浮选和重力沉降的方法，不适于近海及海上油水分离的情况，旋流分离技术具有体积小，重量轻，处理时间短，任意取向，不受振动影响等优点，因而开展低密度差液一液两相旋流分离的研究具有学术意义和工程应用背景。ZI质流程及试验方法工质流程为油水两相均匀的混合物由水箱用泵抽出，…     

Kerr介质中电子的绝热跃迁转移现象和光场的量子统计性质

导出了充满Kerr介质的高Q腔中双模场与级联型三能级原子非共振相互作用系统的态矢量，并以此计算了三能级原子的布居概率和辐射场统计性质随时间的演化.数值计算显示，Kerr效应导致电子的绝热跃迁在原子态间转移的现象，而一定的失谐量使得光场量子统计性质的长时间演化呈现出超结构.     

Improvement of main drift chamber Monte-Carlo tuning model at BESⅢ

Based on real data,a new parameterized model of the main drift chamber response is proposed.In this model,we tune the ratio of good hits and the residual distribution separately.By data quality checking,the diference between simulation and data in track reconstruction efciency reduces from 1%to 0.5%averagely for the pion in J/ψ→π+ππ0,and the momentum resolution agreement improves significantly for the proton in J/ψ→ppˉ.     

Nonsequential double ionization of nonaligned diatomic molecules N2 and O2

Nonsequential double ionization (NSDI) processes of nonaligned diatomic molecules N2 and O2 are studied using the S-matrix theory. Our results show that the NSDI process significantly depends on the molecular symmetry and structure. The ratio of NSDI rate to single ionization rate as a function of the field intensity is obtained. It is found that N2 behaves closely with its companion atom Ar in the ratios over the entire intensity range, while O2 exhibits an obvious suppression effect, which is qualitatively consistent with the experiment.     

BESⅢ主漂移室基于模式匹配的径迹重建

BESⅢ主漂移室径迹重建算法MdcPatRec, 是采用面向对象技术用C++开发的软件. 该算法使用模式匹配的方式寻找径迹段, 连接径迹段为径迹并进行最小二乘拟合. 使用模拟数据对算法进行了检验, 结果表明该径迹重建算法能够提供高的重建效率和好的动量分辨, 各项指标均达到设计要求. 同时具有好的抗噪声能力, 可以满足BESⅢ的使用要求.     

Calibration study of the X-T relation for the BESⅢ drift chamber

Offline calibration plays an important role in BES offline data processing. In order to achieve good spatial and momentum resolution, it is necessary to implement high precision offline calibration for the BES drift chamber. This paper studies the time-to-distance relations, which are important calibration constants for track reconstruction. The parameterization of the time-to-distance relation, studies of left-right asymmetry and studies of variation with entrance angle are performed. The impact of dead channels on the time-to-distance relation is given special attention in order to reduce the shift in measured momentum for tracks passing near dead cells. Finally we present the resolutions for barrel Bhabha events(|cos θ|< 0.8) from a J/ψ data set taken in 2012. The average spatial resolution is 123 μm and the momentum resolution for 1.548 Ge V/c Bhabha tracks is 11.9 Me V/c.     

全自动生化分析仪快速测定饮用水中六价铬

在国家标准方法"GB/T 5750.6—2006"的基础上,用无水乙醇代替有毒的丙酮,同时结合生化分析仪的软硬件条件,实现水中六价铬的快速、自动测定。测定方法的线性范围为0~200μg/L,线性相关系数r=0.999 6,检出限为3.9μg/L(取样量为35μL),加标回收率在98.7%~101%。方法具有取样量少、简便快速、自动准确检测等特点,适合大批量样品的分析应用,有效避免人为操作和环境条件对定量测定的不良影响。     

氰化物溶液中新型镀银光亮剂的研究

用正交法结合小槽试验与Hull Cell试验,合成并筛选出几种有机物作为新型氰化镀银光亮剂,讨论了各种工艺条件对镀层外观的影响,并提出了该光亮剂的最佳工艺条件,通过阴极极化曲线和SEM的测定初步研究了新型氰化镀银光亮剂在镀液中的行为。     

用NMR谱研究乙酸甲酯的水解反应

用ＮＭＲ谱研究乙酸甲酯的水解反应邵振忠，李卫东（北京师范大学化学系１００８７５）核磁共振除广泛用于有机化学、生物、医药等各个领域外，从６０年代开始在化学动力学方面显示身手，本文用目前很多高校具有的６０兆ＮＭＲ谱仪来测定乙酸甲酯在不同温度下水解反应速率...