共查询到20条相似文献,搜索用时 93 毫秒
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用时间分辨 傅里叶变换红外发射光谱研究了热的氢原子与CO2 分子间高效率的平动 振动 (T V)能传递 .热的氢原子由ArF激光光解H2 S得到 ,这种氢原子的平动能为 2 2 3kJ/mol .实验中观察到了从 2 130cm-1到2 4 0 0cm-1的红外发射谱带 ,它归属于高振动激发的CO2 分子的非对称伸缩振动 (ν3 ) .对这一发射谱带的光谱拟合显示CO2 的非对称伸缩振动被激发到了较高的振动态 ,振动量子数达到了v =7.并且有 5 5 80cm-1的能量经传能过程由氢原子到达了CO2 的ν3 模 .实验条件下氢原子与CO2 的T V传能效率为 0 .30 .实验结果与Schatz等人的用 3D半经典计算预测的碰撞截面符合的很好 . 相似文献
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脉冲激光在液体中激发的声波特性研究 总被引:1,自引:0,他引:1
理论上分析了脉冲激光在液体中产生的声波波阵面随光声源形状的变化,以及不同激发机制下光声脉冲波形的差别,并从实验中得出了脉冲CO2激光光声脉冲频谱特性.结果表明光声波波阵面为球面或柱面,热弹机制激发双极性的光声脉冲,汽化机制激发单极性的光声脉冲,CO2脉冲激光在水中激发的声波频谱峰值主要在100 kHz以下.通过选择光声源的形状和激发机制可以获得所需的光声信号. 相似文献
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We report that the concentration of CO2 over melting ice oscillates as long as water and ice coexist. A phenomenological model involving melting of CO2 containing ice leading to its release, readsorption of the vapor on ice, and dissolution in water is proposed. Thermokinetics of these processes lead to nonlinearity of the dynamics. This phenomenon is also observed over impure ice contaminated with salts or in the presence of nitrogen or air. Oscillations have been observed in several other solute or ice-water systems. 相似文献
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It is widely accepted that wind energy is clean and renewable. However, icing on the blade surfaces of wind turbines is a serious problem in cold regions, which greatly affects its performance. Therefore, it is important to prevent ice accumulation on the surface of wind turbine blade and remove it whenever necessary. In this paper, a new non-thermal method–ultrasonic de-icing for wind turbine blade is proposed. Firstly, baced on the theory of ultrasonic de-icing, the harmonic analysis of the structure of the composite plate-ice layered system is investigated using the finite element method. The simulation results showed that ultrasonic de-icing method is feasible for wind turbine blade de-icing purposes. Secondly, the de-icing experiment of wind turbine blades using piezoelectric actuators is carried out in the freezer at a temperature of −15 °C, results showed that the ice layer can be debonded from the surface of wind turbine blade by the commonly used piezoelectric transducers made by PZT-5. The optimal frequency of ultrasonic de-icing of wind turbine blade is also given; finally, the installation way of ultrasonic transducers on the inner surface of wind turbine blade is given. 相似文献
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Mishima O 《Physical review letters》2000,85(2):334-336
According to the liquid-liquid critical-point hypothesis about water, two liquid waters exist at low temperatures and are supposed to be merged at a critical point. The low-temperature metastable melting curves of D2O ices have been measured. It is found that the melting curve of D2O ice III is smoothly curved around 25 MPa and 238 K, whereas the melting curve of D2O ice IV undergoes an abrupt change of slope at 100 MPa and 220 K. This is consistent with the existence of a liquid-liquid critical point in the region between the melting curve of D2O ice III and the melting curve of D2O ice IV. 相似文献
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10μm超短脉冲激光系统 总被引:1,自引:0,他引:1
具有新颖表面电晕预电离单模TEACO2激光器,等离子体开关和热吸池的光学自由诱导衰变(OFID)激光系统产生30-300ps10.6μm激光。 相似文献
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介绍了一种腔内光强增强型凹面光栅选线法的热带连续波CO2激光器的设计及实验参数。在腔内不加CO2热吸收池,采用总气压为1 074.9 Pa、体积分数为13% CO2, 15% N2和72% He的混合气体,放电电流为25 mA的情况下,除了在常规带0001-[1000,0200]Ⅰ,Ⅱ内观察到从R(56)到P(60)的100多条谱线以外,还得到11 μm附近的其它谱线18条,其中0111-0310谱带9条,0111-1110谱带9条。实验发现,当激光器中氦气的比例升高时,激光的输出功率随之下降。每条谱线的腔内单程功率都超过35 W,足够满足大多数腔内光化学研究方面的需要。 相似文献
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介绍了一种腔内光强增强型凹面光栅选线法的热带连续波CO2激光器的设计及实验参数。在腔内不加CO2热吸收池,采用总气压为1 074.9 Pa、体积分数为13%CO2,15%N2和72%He的混合气体,放电电流为25 mA的情况下,除了在常规带0001-[1000,0200]Ⅰ,Ⅱ内观察到从R(56)到P(60)的100多条谱线以外,还得到11μm附近的其它谱线18条,其中0111-0310谱带9条,0111-1110谱带9条。实验发现,当激光器中氦气的比例升高时,激光的输出功率随之下降。每条谱线的腔内单程功率都超过35 W,足够满足大多数腔内光化学研究方面的需要。 相似文献
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Y-Ba-Cu-O orthorhombic superconducting phase direct crystallization from the 123 composition of liquid were realized by continuous wave CO2 laser using non equilibrium phase transformation of scanning laser melting solidification method. The transformation temperature 92 K of superconducting phase were measured. The characteristic peaks of YBa2Cu3O7 superconductors were shown by X-ray diffraction patterns. The sample of magnetization loop at 77 K and structure change were given. 相似文献
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TIAN Nailiang 《Chinese Journal of Lasers》1999,8(4):372-376
Introduction TheinvestigationofdirectcrystallizationofYBa2Cu3O7superconductorbylaserirradiationYBaCuOmaterialofstoichiometrical123compositionisinterested.Thedirectlasersynthesisofhightemperaturesuperconductorhasspecificdominace[1].Itisthefinestru… 相似文献
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注入锁定TEA CO2激光器激光脉冲特性分析 总被引:1,自引:0,他引:1
本文在一般的TEACO2激光器的动力学方程的基础上,给出注入锁定情况下TEACO2激光器的动力学方程组,并进行数值计算,结果表明,TEACO2激光器注入锁定激光脉冲宽度比自由运转时的变宽了,脉冲峰值功率降低,而且激光脉冲产生的时间提前,这与实验规律相吻合。 相似文献