N2O在142.5-147.5 nm射流冷却吸收光谱揭示的解离动力学

在射流冷却分子束下, 测量了142.5～147.5 nm N₂O分子C^{1∏态的吸收光谱,观测到清晰的振动序列结构,振动频率间隔约为500 cm-1. 结合理论计算的电子态势能面结构,这个振动序列被标识为解离电子态C1∏的弯曲振动激发. 傅立叶变换得到了相应的轨道周期为65 fs,而通过Lorentzian线型拟合获得了各振动峰对应的能级寿命约为20 fs.}     

Bifurcation Control of Current-Mode Buck Converter via TDFC

Considering the TDFC controlled current-mode Buck converter featuring periodicity we propose a Fourier-decomposition based method for the bifurcation analysis of this system, hence the theoretical range of control gain of TDFC is determined. In addition, the power-stage experiment circuit is built and the control part is realized in a digital controller. The experimental results show that either bifurcation or chaos in the current-mode Buck converter can be controlled into the expectant period-1 orbit rapidly.     

“发现教学法”的再发现

 把改进教学方法,使教育的重点从传授知识转向培养能力作为一个研究课题,多年以前就引起了一些有识之士的高度重视。人们逐渐形成了一个共识:由于科学技术的发展导致知识在日新月异地更新.     

储存环聚焦结构设计中的比例定律

阐述并证明了储存环聚焦结构设计中的比例定律.即储存环的尺寸按一定比例放大或缩小时,可以保持工作点和束流发射度不变; 介诸存环的能量改变时,其束流发射度将会随能量的平方变化.     

Infrared Absorption Intensity Analysis as a New Tool for Investigation of Salt Effect on Proteins

通过观测红外光谱的强度变化研究了在不同温度下盐离子对谷氨酸和三种水溶性蛋白质(细胞色素C、DsbC和DsbC-G49R)的影响. 证实了Onsager反应场理论. 区分并且定义了随温度变化的蛋白质盐效应盐溶过程和解离过程. 同时利用Van't Hoff关系式对实验结果进行线性拟合,获得了蛋白质及其二级结构在上述两个过程中的热力学常数.     

EAST中性束注入器用高压缓冲器分析

中性束注入(NBI)加速器短路故障时,根据B-H曲线和高压缓冲器的结构尺寸,在Fink的Snubber分析方法基础上,分别导出高压缓冲器任意铁芯叠片层的感应电压、涡流电阻与铁芯叠片层饱和深度的关系;利用安培环路定律,推出不同铁芯叠片层中涡流大小、饱和深度表达式,从而导出整个高压缓冲器随铁芯饱和深度变化的等效涡流电阻的表达式。根据Snubber的等效涡流电阻及NBI系统的杂散电容,分析故障时的瞬态短路电流回路,得到了铁芯叠片饱和深度的指数时间常数与电弧电流的表达式;得出高压缓冲器铁芯叠片的最大宽度及最小厚度分别为28 mm和114μm。经实验测试和理论计算对比分析可知,铁芯叠片饱和深度的指数时间常数的测试值与理论值基本吻合。     

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以碰撞为能量交换机制,按局部热力学平衡近似处理低气压等离子体,并考虑辉光放电二极之间的电位分布,得到了电子密度与气体压力的关系和电子温度与电场强度的关系。提出了一种利用压强、电压和电流就获得电子温度和密度的诊断方法。用Langmuir探针方法验证了获得的结果。     

Particle Simulation of Electrostatic Waves Driven by an Electron Beam

A one-dimensional electrostatic particle-in-cell simulation is performed to study electrostatic wave excitation due to an electron beam in a plasma system. The excited fundamental and harmonic waves are analyzed with the fast Fourier transformation and the wavelet transformation. The second harmonic is suggested to be generated by wave-wave coupling during the nonlinear evolution, which involves forward propagating and backward propagating Langmuir waves. Furthermore, the background electrons may be heated and accelerated by the electrostatic waves.     

Hawking radiation as tunneling and the unified first law of thermodynamics at the apparent horizon of the FRW universe

Relations between the tunneling rate FRW universe are investigated. The namics in such a dynamical system. first law of thermodynamics through and the unified first law of thermodynamics at the apparent horizon of the tunneling rate arises as a consequence of the unified first law of thermodyAnalysis shows how the tunneling is intimately connected with the unified the principle of conservation of energy.     

氢原子的总电流及其经典对应

定态下氢原子平均电流密度只有一个沿纬线的分量非零,本文在这一结果的基础上计算了氢原子的总电流,发现它与经典力学中行星运动的开普勒定律之间有明确的对应关系．