Testing Bell inequality at experiments of high energy physics

Besides using the laser beam, it is very tempting to directly testify the Bell inequality at high energy experiments where the spin correlation is exactly what the original Bell inequality investigates. In this work, we follow the proposal raised in literature and use the successive decays J/ψ→γηc→ΛΛˉ→pπ-pˉπ+ to testify the Bell inequality. Our goal is twofold, namely, we first make a Monte-Carlo simulation of the processes based on the quantum field theory (QFT). Since the underlying theory is QFT, it implies that we pre-admit the validity of quantum picture. Even though the QFT is true, we need to find how big the database should be, so that we can clearly show deviations of the correlation from the Bell inequality determined by the local hidden variable theory. There have been some critiques on the proposed method, so in the second part, we suggest some improvements which may help to remedy the ambiguities indicated by the critiques. It may be realized at an updated facility of high energy physics, such as BES Ⅲ.     

Phenomenological study on the significance of the scalar potential and Lamb shift

We indicated in our previous work that for QED the contributions of the scalar potential, which appears at the loop level, is much smaller than that of the vector potential, and in fact negligible. But the situation may be different for QCD, the reason being that the loop effects are more significant because \alpha_m s is much larger than \alpha, and secondly the non-perturbative QCD effects may induce the scalar potential. In this work, we phenomenologically study the contribution of the scalar potential to the spectra of charmonia. Taking into account both vector and scalar potentials, by fitting the well measured charmonia spectra, we re-fix the relevant parameters and test them by calculating other states of the charmonia family. We also consider the role of the Lamb shift and present the numerical results with and without involving the Lamb shift.     

“小学生互联网使用行为调查”应用案例

实际调研课题中常常面对各种条件的限制,无法按照教科书上严格的抽样设计去实施。但是,研究者完全有可能通过简化的、兼顾学性和操作性的设计,以及各个环节认真细致的质量控制,得到相对高质量的调查数据和分析结论。本文拟用2009年暑假笔者主持完成的"小学生互联网使用行为调查"课题为案例,实事求是地展示一个实际的抽样调查的全过程,希望笔者的体会和思考能对读者有所启示。     

毛细管区带电泳检测抗EGFR抗体的电荷异质性

建立了抗表皮生长因子受体(EGFR)抗体电荷异质性的检测方法。采用毛细管区带电泳(CZE)模式,考察了分离缓冲液浓度和p H值、添加剂、分离电压、毛细管温度对主峰与酸碱性变体分离度的影响。以380 mmol·L~(-1)6-氨基己酸(EACA,pH 6.0)为分离缓冲液,0.1%羟丙基甲基纤维素(HPMC)和1.9mmol·L~(-1)三亚乙基四胺(TETA)作为添加剂,分离电压25 k V,分离时间8 min,毛细管温度20℃条件下,电荷变体能够得到良好分离,且在0.1~1 mg·m L~(-1)范围内线性关系良好,相关系数均大于0.99,主成分、酸、碱变体1和碱变体2的定量下限(LOQ)分别为30.0,150.2,125.2,93.3μg·L~(-1),重复性和中间精密度RSD值小于2%,回收率为95.4%~105.4%。该方法简单、快速、成本低,可以满足抗EGFR抗体的电荷异质性检测要求。     

双金属复合钢管界面及焊缝的微观结构

通过金相分析、微区成份分析、宏观和微观断口分析,主要研究钎焊层和焊缝区的微观结构及其对复合钢管工艺性能和使用性能的影响。研究结果表明,镍基钎焊层通过扩散形成界面,实现了完全的冶金结合。组成复合钢管的各层以及焊缝金属的力学性能相近,变形均匀,保证了复合钢管的可焊性和强韧性。铜钎焊复合钢管由于高温铜脆而引发焊接裂纹,且其钎焊层硬度明显高于基层和复层,导致层间剪切及沿界面发生分层脱离,固该铜基合金不宜做复合钢管钎焊料。     

棒状薄层色谱/氢火焰法分析磺化酞菁钴的组成

研究建立了一种采用棒状薄层色谱／氢火焰离子检测（TLC／FID）对磺化酞菁钴组成进行定性、定量分析的方法。用薄层色谱并结合质谱分析 表明工业磺化酞菁钴中含有一磺化酞菁钴的两种同分异构体,二磺化酞菁钴的5种同分异构体及三磺化酞菁钴;用棒状薄层色谱／氢离子火焰检测方法可以对磺化酞菁钴中各组分进行定量分析。该方法操作简便,测定时间短,灵敏度高,可用于磺化酞菁钴工业合成的产品质量控制。     

Diffusion-Editing NMR Spectroscopy for Mixtures

According to the Stokes-Einstein equation, the diffusion coefficient of a molecule is inversely proportional to the molecular radius, therefore translational diffusion coefficients are different for various molecular sizes. The aim of this work was to develop a diffusion-editing NMR method that allows to directly observe the individual components in mixtures without the need of physical separation.     

中国人民银行城镇户调查抽样方案的设计

本文采用多级、分层、ＰＰＳ与等概率相结合的混合抽样方法,在考虑实际条件和限制的情况下,尽可能地使抽样的科学性和可操作性得到较好的结合,为中国人民银行的全国城镇储户调查设计了切实可行的抽样方案     

Thermodynamics of 1D N-Component Bariev Model Under Open Boundary Conditions

The thermodynamic Bethe ansatz equations and free energy for 1D N-component Bariev model under open boundary conditions are derived based on the string hypothesis for both, a repulsive and an attractive interaction.These equations are discussed in some limiting cases, such as the ground state, weak and strong couplings.