On AdS/CFT correspondence of EYM fields

In the compactized Minkowski space, which is equivalent to the conformal spaceM ₄, we introduced a Lorentz metric d σ² and a Yang-Mills field θ. Later, we proved that dσ² and θ together satisfy the EYM (Einstein-Yang-Mills) equation. In this paper, it is proved that θ onM ₄ (which is the boundary of the anti-de-Sitter space AdS₅) can be extended to be a Yang-Mills field [^(q)]\hat \theta on AdS₅ such that Hua’s metric ds² on AdS₅, together with [^(q)]\hat \theta satisfies the EYM equation on AdS₅.     

Study of q and η' physics at BES-Ⅲ

Decays of both η and η' provide very useful information in our understanding of low-energy QCD,and experimental signatures for these decays would be extremely helpful at BES-Ⅲ.The rare decays of the η and η' mesons could serve as a low-energy test of the Standard Model and its beyond.The sensitivities of the measurements of η and η' decays are discussed at BES-Ⅲ,in which the η and η' mesons are produced in the ψ decays.     

Tuning for the first 9-cell TESLA cavity of PKU

A method based on circuit model is used to tune the first home-made 9-cell TESLA type superconducting niobium cavity at Peking University.After tuning,a flat field profile with a final π-mode frequency within 3 kHz of target frequency is achieved.The field flatness is measured by a bead-pull method,and the relative electric field is calculated from the frequency shift perturbed by the bead stepping along the axis of the cavity.     

逐步增加的Ⅱ型截尾下冷贮备串联系统可靠性指标的Bayes估计

在逐步增加的Ⅱ型截尾模型下,运用Bayes方法,研究部件寿命服从双参数指数分布的冷贮备串联系统可靠性指标的近似置信区间问题.在两个参数均未知的情形下,给出了失效率,系统可靠度及平均寿命的Bayes近似置信区间的计算公式;对于超参数的确定,给出一种新的方法;最后进行了随机模拟,并对近似置信区间的精度进行了讨论.     

纳米压印光刻中模版与基片的平行调整方法

概述了纳米压印光刻的原理，以及纳米压印光刻工艺中模版与基片的平行度对压印质量的影响，分析了国内外几种纳米压印光刻工作台的结构与特点，并对其优缺点进行了评价。     

DCS——偶氮胂与稀土元素显色反应及其在水分析中的应用

本文研究了DCS——偶氮胂与稀土的显色反应,在测定水中稀土时,用PMBP萃淋树脂分离干扰元素。用计算机处理实验数据,相关系数r=0.9992,分析结果令人满意。     

Unexpected Chemisorption State of CO2 on the Si(100)-2×1 Surface Predicted by Theory

Li the past decade, the reactivity of carbon containing confounds with single crystal silicon surfaces has received extensive attention from both experimental and theoretical sides owing to its compact relevance to the growth of silicon carbide and diamond films. While considerable interest has been focused on the adsorptions of alkenes, alkanes and some other small organic molecules^[1], very few experiments^[2,3] can be found in the literature regarding the adsorption of CO₂,a greenhouse gas, on Si surfaces. We report herein the results of our recent theoretical study concerning CO₂ adsorption on the reconstructed Si(100)-2×l surface. The methods employed in our calculations are the hybrid density functional B3LYP method and a two-layer ONIOM (CCSD(T):B3LYP) approach^[4].     

由5-磺基水杨酸组装的镧系金属有机骨架配合物的合成及结构

在水热条件下,合成了6个新的镧系金属配位聚合物,Ln₂(SSA)₂(phen)₄(H₂O)₂(Ln=Er(Ⅲ) (1),Yb(Ⅲ) (2)),[La₂(SSA)₂(phen)₂(H₂O)₄·(phen)·(H₂O)_{1.33相似文献}   

水解胶原蛋白热氧化及CaSO4形成机理探讨

水解胶原蛋白热氧化及CaSO4形成机理探讨;水解胶原蛋白; L-抗坏血酸; H2O2; 热氧化; CaSO4