Perturbative QCD for J/ψ inclusive production via initial state radiation in e~+e~- collisions

The process e+e-→J/ψ+X with the center-of-mass(CM)energy in the range from 3.7 to 10.6 GeV is calculated up to the next-to-leading order(NLO)in quantum chromodynamics(QCD).At 10.6 GeV,the result is consistent with the experimental result from Belle.However,the predictions are much smaller than the background in the measurements at BESIII in the low CM energy range from 3.7 to 4.6 GeV.This indicates that the convergence of the QCD perturbative expansion becomes worse as the CM energy is closer to the inclusive J/ψ production threshold.For a further study of the QCD mechanism of J/ψ production in e~+e~-collisions with different CM energies,the initial state radiation effect of e~+e~-→J/ψ +gg and e~+e~-→J/ψ+cc are calculated in QCD NLO.The results are plotted and the number of events for different CM energy bins are provided for SuperKEKB.This provides a method to precisely test the validity of perturbative predictions for J/ψ production in future measurements.     

可溶性聚对苯乙炔的合成及其电致发光性能

采用紫外－可见光谱跟踪用直接聚合法制备可溶性的聚对苯乙炔衍生物的反应过程,结果表明反应仍然经历了生成前聚物的过程。控制反应条件使聚合反应首先生成前聚物,在前聚物烯化反应阶段加入起增溶作用的长链醇,得到了具有良好的溶解性的、主链中含非共轭链段的聚对苯乙炔衍生物。用该聚合物制备的电致发光器件,在５－６Ｖ电压驱动下发光,发光峰位于５８０ｎｍ左右。     

两级分块结构化网格在SK型静态混合器中的应用

给出一种适用于SK型静态混合器流场数值模拟的两级分块结构化网格划分方案和分块圆弧区点的极坐标方程。与常用的非结构四面体网格划分对比,两种方法划分网格数量相近时,两级分块结构化网格达到的迭代精度高于非结构化网格一个等级,而非结构化网格收敛所用时间约为结构化网格收敛所用时间的1.25倍;运用控制体积容积变化值对两种方法划分网格进行质量评估,结构化网格划分方法接近99%网格质量指标在1.0~2.0范围内,而非结构化网格仅接近60%网格质量指标在1.0~2.0范围内。通过实验测量对两种方法划分网格数值模拟结果进行对比验证,结构化网格计算结果与实验值更为接近,表明其可行性和准确性均优于非结构四面体网格划分。     

表面增强拉曼光谱研究稳定剂TAI在银上的吸附

用表面增强拉曼光谱的方法研究 4-羟基--甲基-1,3,3a,7-四氮茚(TAI)在金属银上的吸附.实验表明TAI分子是通过分子上的N原子以化学吸附的方式吸附在银电极上.电极处理的氧化-还原循环次数并不影响振动频率,但在一定范围内对表面增强拉曼光谱的吸收强度有明显影响.