Microwave spectra and structure of an isoxazole-water complex

The rotational spectrum of a hydrogen-bonded isoxazole-water complex has been measured between 6–18 GHz with a pulsed nozzle Fourier transform microwave spectrometer. In addition to isoxazole-H₂O, the complexes with HDO and D₂O as well as isoxazole-¹⁵ N-H₂O have been investigated in order to determine the structure of the complex. Rotational constants, quartic centrifugal distortion constants and quadrupole coupling constants, where applicable, have been fitted to the measured transition frequencies of the isotopomers. Structural data, which have been deduced from the planar moments of inertia and the quadrupole coupling constants of the isotopomers, have established conclusively that water binds to nitrogen in the ring plane of isoxazole. Ab initio calculations have revealed that complexes with a hydrogen-bond to nitrogen or to oxygen are both stable. The complex with water attached to nitrogen has been found to be more strongly bound than that with water attached to oxygen. Small splittings of the rotational transitions of the two complexes with H₂O have been interpreted as being the result of an internal rotation of water with respect to isoxazole.     

The Solution of Dynamical Equation of Motion of IBM-Ⅱ in Continuous Variable Representation

In this article the solution of dynamical equation of motion of IBM-Ⅱ in continuous variable representation is discussed.With appropriate transformation and approximation,the on-phase part of system manifests the vibration-rotation mode and the off-phase part the 'scissor mode',ect.In the last section the energy spectrum of ¹⁵⁶Gd is calculated.The result can well reproduce the algebraic result of IBM-Ⅱ.     

压力及屏蔽对无限深量子阱中施主结合能的影响

对GaAs/Al_xGa_1-xAs和GaN/Al_xGa_1-xN无限深量子阱系统,考虑压力及屏蔽效应,利用变分方法数值计算这两种系统中的杂质态结合能。给出了结合能随阱宽和压力的变化关系,同时讨论了有无屏蔽时的区别。结果表明,结合能随压力增大而增大,随阱宽增大而减小;屏蔽效应随着压力的增加而增加,并且显著降低了杂质态的结合能。     

Nonlinear Local Lyapunov Exponent and Quantification of Local Predictability

Nonlinear local Lyapunov exponent （NLLE） is applied to quantitatively determine the local predictability limit of chaotic systems. As an example, we find that the local predictability limit of Henon attractor varies considerably with time, and some underlying phase-spatial structure does not appear. The local predictability limit of initially adjacent points in phase space may be completely different. This will cause difficulties in making the long-time analogue forecast.     

低能Cl-离子在绝缘纳米微孔膜中的传输过程

理论模拟结合实验研究了16-keV Cl-离子穿越不同厚度(7和12 μm)的Al₂O₃微孔膜的物理过程,发现负离子传输中并不存在与正离子传输类似的明显的导向现象。在只考虑散射过程的情况下,模拟出的穿透粒子角分布及电荷态分布与实验结果符合很好,出射的Cl-离子沿初束方向分布;Cl0、Cl+离子沿微孔轴向分布。仔细分析了不同出射粒子的角分布,发现出射的Cl+在微孔轴向与初束方向之间分布;经单次散射出射的Cl0沿微孔轴向分布,而经多次散射出射的Cl0向初束方向移动。发现了Cl-离子穿越不同厚度的具有相同微孔直径的Al₂O₃微孔时,较厚的膜出射的Cl+/Cl0比例低。理论分析显示,这是由散射过程的特性造成的,随着微孔膜厚度的增加,出射的Cl0中经单次碰撞的比例变小,而多次散射出射的比例增加,从而导致Cl+离子转化为Cl0的几率要远大于Cl0转化为Cl+离子的几率,使得长的微孔出射的粒子中Cl+/Cl0比例低。     

含N、O和S的Schiff碱配体与铜(Ⅱ)、锌(Ⅱ)配合物的合成及红外光谱研究

本文在40℃条件下制得了5-氯水杨醛,使其与硫脲缩合合成出了一种含N、O、S的新型Schiff碱配体,该配体与铜(Ⅱ)、锌(Ⅱ)能形成稳定的配合物,其组成、结构已由元素分析和红外光谱所表征.     

用于多组分同时测定的流动注射-CCD阵列探测分光光度装置研究

使用流动注射进样、多色仪分光、ＣＣＤ阵列探测器以及微机处理机等,建立了用于多组分同时测定的流动注射－ＣＣＤ阵列探测器联用分光光度装置。完成以ｍｅｓｏ－四（４－三甲铵苯基）卟啉为显色剂时铅和镉的同时测量,铅的检出限为０．０１４μｍ／ｍＬ,镉为０．０１５μｇ／ｍＬ。     

脉冲激光激发Cu等离子体温度的玻耳兹曼方法测量研究

 以YAG调Q脉冲激光为光源,以金属Cu作为样品,使用CCD技术采集Cu等离子体瞬态光谱,用玻耳兹曼分布法对激光等离子体的温度进行了测量。由测量结果可知,当激光脉冲能量为0.1J时,测量的Cu谱为原子激发谱,等离子体温度为14063K。作为对比,还用同样方法测量了交流电弧激发的Cu等离子体温度。所建立的测温方法对于研究激光与物质的相互作用有重要应用前景。     

~(12)C~(6+)离子辐照对苜蓿M1代低温胁迫存活率、过氧化氢酶及过氧化物酶活性的影响

研究了不同剂量12C6+离子辐照对中兰1号、BC-04-477、塔城3种苜蓿M1代个体在低温胁迫下存活率、过氧化氢酶(CAT)及过氧化物酶(POD)活性的影响。在辐照剂量为400 Gy时,中兰1号低温胁迫组存活率、CAT活性比未辐照的对照分别提高了33.3%,56.3%,POD活性与未辐照的对照无差异;在辐照剂量为400 Gy时,BC-04-477低温胁迫组存活率、CAT及POD活性比未辐照的对照组分别提高了33.3%,69.2%,5.1%;塔城在辐照剂量为800 Gy时,低温胁迫组的存活率、CAT及POD活性比未辐照的对照组分别提高了25%,26%,22.8%。以上结果表明,12C6+离子辐照可以提高中兰1号、BC-04-477、塔城的低温环境的存活能力,提高苜蓿抗寒性能。     

Global existence of classical solutions to the vlasov-poisson system in a three-dimensional,cosmological setting

The initial-value problem for the Vlasov-Poisson system is by now well understood in the case of an isolated system where, by definition, the distribution function of the particles as well as the gravitational potential vanish at spatial infinity. Here we start with homogeneous solutions, which have a spatially constant, non-zero mass density and which describe the mass distribution in a Newtonian model of the universe. These homogeneous states can be constructed explicitly, and we consider deviations from such homogeneous states, which then satisfy a modified version of the Vlasov-Poisson system. We prove global existence and uniqueness of classical solutions to the corresponding initial-value problem for initial data which represent spatially periodic deviations from homogeneous states.