共查询到20条相似文献,搜索用时 15 毫秒
1.
3.
7.
本文根据"音棒"实验的现象,进行猜想推理和理论计算,建立了相应的驻波模型,进而设计实验,利用基于电脑声卡的虚拟示波器进行探究,最终验证了理论模型的正确性.在该实验中驻波的波腹在铝棒两端,波节为手指捏的位置,其频率满足f=vN/2L. 相似文献
8.
9.
10.
11.
12.
13.
14.
15.
研究了线极化相对论激光驻波场中的电子运动,分析了偏振面内入射的电子在激光驻波场中的散射与电子初始位置、能量以及激光强度的关系.结果表明,电子在驻波场中的散射情况与电子对激光的相对能量γ0/a0密切相关.对于同样的激光强度,电子初始能量存在一个能够发生前向或背向散射的临界值.光强越大,电子发生前向散射的初始能量临界值越大.用电子相对能量来衡量,这个临界值大约在1.0一1.25范围内.当相对能量超过该值,电子运动会从背向变为前向散射.电子在驻波场中的振荡中心和有质动力逆转效应的存在也是有条件的,二者只有电子相对能量γ0/a0在一定取值范围内才可能存在.相对能量越小,电子能发生前向散射的入射驻波面越小,而低能电子更倾向于从波节透过.在偏振面内入射的电子在高强度驻波场中会发生非弹性散射,电子与场会发生高能量交换. 相似文献
16.
《低温与超导》2021,49(5):9-13
基于热声效应的磁致伸缩换能器热声制冷机,其内部的介质密度对于制冷效率的提高有重要作用。选用改变基础声压来控制谐振腔内介质密度的大小,选取了基础声压0.2—1.0 MPa之间,每0.2 MPa作为间隔,对五种基础声压下1 000—8 000 Hz不同激励下用有限元仿真软件ATILA进行仿真分析,得到趋势是呈现增大的,而且最大值在基础声压和激励频率最大值处,达到了359.97 Pa;在基础压力为0.6 MPa、激励频率为2 000 Hz的条件下谐振腔同时满足驻波形态和高声压。并对整机的模型进行激励频率-辐射板位移输出分析,得到在激励频率为9 000 Hz时,辐射板输出位移最大。随着介质密度的增加,热声制冷机内谐振腔内的驻波形态并没有因此而增加,存在一个同时满足驻波状态和高声压的状态。 相似文献
17.
19.
Decreased vibrational susceptibility of Fabry--Perot cavities via designs of geometry and structural support 总被引:3,自引:0,他引:3 下载免费PDF全文
Ultra-stable optical cavities are widely used for laser frequency
stabilization. In these experiments the laser performance relies on
the length stability of the Fabry--Perot cavities. Vibration-induced
deformation is one of the dominant factors that affect the stability
of ultra-stable optical cavities. We have quantitatively
analysed the elastic deformation of Fabry--Perot cavities with various shapes
and mounting configurations. Our numerical result facilitates a
novel approach for the design of ultra-stable cavities that are
insensitive to vibrational perturbations. This approach can be
applied to many experiments such as laser frequency stabilization,
high-precision laser spectroscopy, and optical frequency standards. 相似文献
20.
Molecular structure, vibrational frequency and infrared intensity of UF6 are investigated by using the revised Perdew Burke-Enzerhof function with the triple-zeta polarized basis set. The calculation results are in good agreement with the experimental values and indicate the existence of a stable U2F6 molecule with a multiple bonded U2 unit. The calculation results also predict that the D3d symmetry of U2F6 is more stable than D3h. The optimized geometries, vibrational frequencies, and infrared intensities are also reported for U2F6 molecules in D3d symmetry. In addition, the isotopic shift of vibrational frequencies of the two molecules under isotopic substitution of uranium atom are also investigated with the same method. The U2F6 molecule is predicted to be better than UF6 for laser uranic isotope separation. 相似文献