模拟电路故障诊断的新故障字典法

基于节点电压灵敏度,将文献[1]中的线性无容差电路的故障字典法推广到可以诊断容差模拟电路和非线性电路软故障的新故障字典法。讨论了该方法的原理和字典的建立方法,给出了仿真实例。     

简并双光子过程中两能级原子的消相干

两能级原子置于外部环境（热库）时,将两能级原子视为量子位,通过分析简并双光子过程中量子位约化密度算符非对角元的时间演化,研究量子位消相干规律。     

一种新型的中性原子交流电磁囚禁

提出了一种新型的冷原子强场seeking态磁势阱 ,利用的是原子在交变四极场中受到的梯度力。计算结果表明通过选择合适的参数 ,可以控制势阱在轴向和径向的势阱深度。在得到一个径向势阱深度达 0 6mK ,纵向深度为 0 5mK的交流磁势阱 ,可以将温度为～ 10 0 μK的冷原子囚禁在径向 1mm ,纵向 4mm的范围内。如果撤消轴向囚禁 ,还可以获得一个径向囚禁深度为 1 8mK ,能将温度为～ 10 0 μK的冷原子囚禁在径向 5 0 μm范围内的新型磁导管。     

氩原子参与的钠原子Energy-pooling碰撞过程

报道了钠原子在有惰性气体氩原子参与的Energy pooling碰撞过程。观察到了由此而产生的分子三重态和原子高位态的紫区受激辐射。实验结果表明 ,原子高位态的这种布居过程中角动量也起了一定作用。利用瞬时速率方程拟合了实验结果 ,得到了相同的变化规律。     

V型三能级原子与热辐射场Raman相互作用时原子的动力学特性

研究V型三能级原子与外部环境（热库）的Raman相互作用。利用绝热消除的方法,将三能级原子与热辐射场的相互作用,转化为等铲的两态系统与热库的相互作用,从而计算原子约化密度矩阵非对角元,分析原子状态的演化特性。     

树枝状大分子/聚(N-异丙基丙烯酰胺)纳米粒子的制备

使用溴乙酰溴对第四代聚丙烯亚胺树枝状大分子 (DAB-32)进行改性,成功合成了树枝状大分子引发剂DAB-32-Br。以DAB-32-Br/CuBr/Bpy为催化引发体系,分别在水和水/乙醇反应介质中,实现了N－异丙基丙烯酰胺（NIPAAm）的原子转移自由基聚合（ATRP）,得到粒径在60－150 nm范围内的树枝状大分子/聚（N－异丙基丙烯酰胺）纳米粒子。与水介质中ATRP相比,在水/乙醇介质中所得聚合物纳米粒子更加规则,而且粒子间聚集程度较低。     

Integration of Solventless Reaction in a Multi‐Step Process: Application to an Efficient Synthesis of PA‐824

In order to improve redundant synthetic processes, the integration of a solventless reaction has proved to be useful for gaining high reaction mass efficiency (RME) as well as reducing the amount of solvents. This concept was applied to synthesis of PA‐824, a potential antituberculosis drug. Thus, the solventless ring‐opening reaction of glycidyl silyl ether with dinitroimidazole was connected to succeeding solution reactions. The ring‐opening of glycidol followed by selective silylation of the primary hydroxy group under solventless conditions was also feasible. As a consequence, the overall yield of the target compound was nearly tripled, and thus the RME values were increased more than 2.5 times while the amount of necessary solvents was decreased to less than 1/3.     

Direct Arylation of Thiophenes via Palladium‐Catalysed C?H Functionalisation at Low Catalyst Loadings

Palladium associated with cis,cis,cis‐1,2,3,4‐tetrakis(diphenylphosphinomethyl)cyclopentane (Tedicyp) was found to promote the direct 2‐arylation of a variety of thiophene derivatives via C H functionalisation in good yields using very low catalyst loadings. Electron‐deficient, electron‐excessive or sterically‐congested aryl bromides are tolerated. Moreover, several substituents on the aryl bromide or thiophene derivatives such as acetyl, formyl, nitrile, nitro, ester, methoxy, fluoro or trifluoromethyl are tolerated. The most reactive aryl bromides were coupled with thiophenes derivatives using as little as 0.1–0.01 mol % catalyst.     

氢原子的量子尺寸效应新理论

根据实么正变换理论 ,并结合SU ( 1,1)Lie代数 ,对氢原子的量子尺寸效应进行详细研讨。结果表明 ,氢原子的能级和波函数随时间变化的规律较复杂 ,并且是精确的     

h-连通图中可收缩边的存在定理

设G是h-连通的简单非完全图,对G中的任一条边uv,用ud,dv表示顶点u、v的度,若du dv≥5g/2-1,则图G存在可收缩边,从而推广了Yoshimi Egama^[1]的结论。