共查询到20条相似文献,搜索用时 31 毫秒
1.
利用基本电子元器件和常用普通芯片设计出能产生频率可调方波、三角波、正弦波信号的电路;并制作出PCB板,制成实物供"示波器使用"实验使用,即方便了教学,又节约了经费。 相似文献
2.
3.
4.
M. Krawczyk 《Journal of magnetism and magnetic materials》2010,322(5):562-565
We show that magnetostatic modes with amplitude localized in different regions of the sample along the direction of the magnetic field occur in ferromagnetic stripes: bulk-dead modes, with amplitude localized in two regions and comb modes localized in its central part. We also demonstrate these localization properties can be studied by Brillouin light scattering techniques and applied in practice. Having established that the localization of these modes varies with their frequency, we use this finding as the basis of a trial reinterpretation of experimental results obtained by Demidov et al. [Appl. Phys. Lett. 92 (2008) 232503]. 相似文献
5.
F.G. Mitri 《Ultrasonics》2010,50(6):620-627
Objective
The present research examines the acoustic radiation force of axisymmetric waves incident upon a cylinder of circular surface immersed in a nonviscous fluid. The attempt here is to unify the various treatments of radiation force on a cylinder with arbitrary radius and provide a formulation suitable for any axisymmetric incident wave.Method and results
Analytical equations are derived for the acoustic scattering field and the axial acoustic radiation force. A general formulation for the radiation force function, which is the radiation force per unit energy density per unit cross-sectional surface, is derived. Specialized forms of the radiation force function are provided for several types of incident waves including plane progressive, plane standing, plane quasi-standing, cylindrical progressive diverging, cylindrical progressive converging and cylindrical standing and quasi-standing diverging waves (with an extension to the case of spherical standing and quasi-standing diverging waves incident upon a sphere).Significance and some potential applications
This study may be helpful essentially due to its inherent value as a canonical problem in physical acoustics. Potential applications include particle manipulation of cylindrical shaped structures in biomedicine, micro-gravity environments, fluid dynamics properties of cylindrical capillary bridges, and the micro-fabrication of new cylindrical crystals to better control light beams. 相似文献6.
设计并搭建了一套简易的激光衍射实验装置,通过该装置作者测量了水的表面波的波长,并确定了水的表面波主要成份是毛细成分。 相似文献
7.
再谈尼科耳棱镜中e光的传播 总被引:6,自引:4,他引:2
从e光波的波法线分析着手,导出确定e光波的波法线,波射线方向的表达式,论述了e光波在尼科耳棱镜内加拿大树胶层的发生全反射的条件,并给出定量结果。 相似文献
8.
9.
11.
The coupling of lower hybrid wave to the plasma is a
crucial issue for efficient current drive in tokamaks. This paper
establishes a new coupling model which assumes the antenna to be a
curved face and the plasma to be a cylinder. Power spectrum considering
the coupling between wave-guides in both poloidal and toroidal
direction is simply estimated and discussed. The effect of the poloidal wave
vector on wave propagation, power deposition and driven current is
also investigated with the help of lower hybrid current drive code.
Results show that the poloidal wave vector affects the ray tracing,
and also has effect on power deposition and driven current. The
effect of the poloidal wave vector on power deposition and driven
current profile depends on plasma parameters. Preliminary studies
suggest that it seems possible to control the current profile by
adjusting the poloidal phase difference between the waveguide in
poloidal direction. 相似文献
12.
13.
为获得大功率太赫兹源,对基于表面波振荡器的相对论太赫兹源进行了初步的实验研究。为便于机械加工和实验装配,器件采用过模矩形波导慢波结构。利用理论分析和数值模拟得到的参数,在CKP1000加速器上进行了实验。功率测量采用辐射场功率密度积分方法,频率测量采用截止波导滤波法。在电子束压为320 kV、电子束流强度为2.1 kA、引导磁场为5 T条件下,实验获得频率0.136 THz以上、脉冲宽度为1.5 ns和辐射功率约2 MW的太赫兹信号输出。 相似文献
14.
激光等离子体的声学诊断研究 总被引:6,自引:0,他引:6
提出了利用激光等离子体声波对高功率激光与材料相互作用过程进行了诊断的方法。实际测量了波长0.53μm激光与几种金属材料相互作用的过程,其结果与采用春它方法得到的结果基本吻合。 相似文献
15.
We investigate a (2+1)-dimensional shallow water wave equation and describe its nonlinear dynamical behaviors in physics. Based on the N-soliton solutions, the higher-order fissionable and fusionable waves, fissionable or fusionable waves mixed with soliton molecular and breather waves can be obtained by various constraints of special parameters. At the same time, by the long wave limit method, the interaction waves between fissionable or fusionable waves with higher-order lumps are acquired. Combined with the dynamic figures of the waves, the properties of the solution are deeply studied to reveal the physical significance of the waves. 相似文献
16.
17.
18.
19.
20.
本文对在一条波线上的两个驻波的叠加结果进行了简明扼要的分析,对进一步理解行波和驻波之间的相互关系有积极的意义。 相似文献