D介子衰变中的奇异轴矢介子(英文)

目前,奇异轴矢介子的性质并没有被很好地理解,而这类介子是可以在D介子衰变中得到更多的研究。将窄宽近似下的等式关系和强衰变中CP守恒应用到四体衰变D0 → K+K-π+π-中的D0 → K±K₁?（1270）（→ρK or K*π）的实验数据中,可以发现实验数据与理论存在矛盾,然而,当考虑更多K₁（1270）的衰变过程后,可以发现,B（D0 → K-K₁+（1270）（→ K*0π+））的实验数据很可能被高估了一个量级。考虑共振态K₁（1400）的贡献,利用因子化方法计算相应的衰变过程的分支比,可以发现,B（D0 → K-K₁+（1400）（→ K*0π+））的分支比与使用等式关系得到的B（D0 → K-K₁+（1270）（→ K*0π+））的分支比在量级上是相同的。另外,对于含有奇异轴矢介子的D介子衰变实验数据的合理性,实验可以通过测量K₁（1270）→ ρK和K*π分支比的比值来检验,或者通过验证D介子衰变中的等式关系来检验。     

Measurement and correlation of solid–liquid equilibria of Irganox 1010 with n-hexane

Solid–liquid equilibria (SLE) for the binary mixtures of Irganox 1010 with n-hexane have been measured using a method in which an excess amount of solute was equilibrated with the alkane solution. The liquid concentrations of the Irganox 1010 in the saturated solution were analyzed by UV spectrometry. Activity coefficients for Irganox 1010 have been calculated by means of the Wilson, NRTL and UNIQUAC models and with them were correlated solubility data that were compared with the experimental ones. The best correlation of the solubility data has been obtained by the Wilson model, by which the average root-mean-square deviation of temperature for the system is 0.33 K.     

基于S7-300 PLC的泥沙输送实验台数据采集系统设计

本文提出一种基于S7-300 PLC的泥砂输送实验台的数据采集方案。该系统采用CPU模块和上位机组成中央控制站,分布式I/O模块组成现场工作站,设计PLC数据缓存程序,实现数据采集。上位机与PLC之间的数据传输采用OPC服务器,OPC客户端软件采用VC++编程开发。     

基于 WCDMA的移动多媒体解决方案

3G系统的一个主要目的,就是在移动通信领域提供丰富的多媒体应用。为此各种3G标准均仔细研究并提供了相应的解决方案。文章简要介绍了3G系统的数据承载业务及多媒体应用两个方面的内容。     

大功率半导体激光器驱动电源的设计

设计一种大功率半导体激光器的驱动电源。恒稳电流范围为 0～ 10 A,稳流精度为 1m A,脉冲输出电流频率为 10 KHz,脉冲电流的占空比为 1∶ 10 ,脉冲电流幅值为 0～ 10 A可调     

A study of fluorescence properties of citrinin in β-cyclodextrin aqueous solution and different solvents

Citrinin (CIT) is a nephrotoxic mycotoxin initially isolated from filamentous fungus Penicilliu citrinum. It was later isolated from several other species, such as Aspergillus and Monascus. It has a conjugated, planar structure that gives it a natural fluorescence ability, which can be used to develop sensitive methods for detecting CIT in food. In this paper, we used the spectro?uorescence technique to study the effects of pH value, β-cyclodextrin (β-CD) and organic solvents on the CIT fluorescence intensity. The results show that lower pH value, aceitc acid, β-CD and acetonitrile can induce a higher fluorescence intensity of CIT, but methanol or H₂O has a decreasing effect on the fluorescence intensity of CIT. Findings in this study provide a theoretical basis for development of a high sensitivity fluorescence-based trace analysis for CIT detection.     

服务质量约束下的IP组播通信可靠性评估方法

In order to estimate the reliability performance of multicast communication under multiple constraint conditions, the weight of service rate and the reliability index are defined, accompanying the calculation method. Firstly, according to the Quality of Service requirements, the appropriate routings between the central node and target nodes that meet the requirements are calculated using the iterative method in the weighted internet. Then, the disjoint set of network state and the coefficients of weighted service rate are calculated by decomposition and merge methods. Lastly, the formula for calculating the service rate is obtained based on the disjoint set of network state and the calculation of the reliability index will be completed. The simulation result shows that the reliability of multicast communication can be appropriately reflected by the weight of service rate and the calculation method, which can provide the theoretical basis for the reliability evaluation of multicast communication.     

高聚物表征中凝胶色谱与自动粘度计的联用技术

就凝胶色谱(GPC)与自动粘度计联用技术而言,在实验上必须注意严格控制温度及避免粘度计器壁效应。在处理数据时应考虑浓度检测器和粮度计之间的连结管道死体积△V和虹吸管残留液的影响。另外如以(η_r-1)/C计算各级分的特性粘数时由于各级分的聚合物浓度不同将引进不同程度的误差。我们用一点法公式计算每级分粘度避免了这种误差。     

Extension to R + n+1 of singular integrals and fractional integrals

In this paper, a natural R ₊ ⁿ⁺¹ extension of singular integrals, i.e.,T _κ:f→K*φ _t *t with K a standard C-Z kernel and ϕ usual one, is investigated. One of the main results is: Let (dμ, udx) ∈C₁ and u-Mw, w∈A_∞, then T_k is of type (L^p(udx), L^p(dμ)). As a related topic, a maximal operator is proved to be of type , where , provided (dμ, udx) ∈C₁ and u∈ A_∞. Supported by National Science Foundation of China     

关于周期环结构的几个定理

本文给出了有关周期环结构的一些结果,而使文献[1]中的所有定理都可以做为本文结果的直接结论。