排序方式: 共有12条查询结果,搜索用时 15 毫秒
1.
2.
The effects of colored noise on self-propelled particles in a two-dimensional potential are investigated. The resonance phenomenon was found as the the average velocity has a maximum value with increasing x direction noise intensity. The average velocity takes its maximal value as the parameters (the y direction noise intensity, the self-propelled angle noise intensity, and so on) take suitable values. The y direction noise and the self-propelled angle noise have great effects on the x direction particles transport. The y direction noise and the self-propelled angle noise cannot induce x direction particles transport in the absence of x direction noise. The ratchet effect should disappear when there is no coupling between the x direction potential and the y direction potential. 相似文献
3.
DingYan(丁剡);ZhouXueyi(周雪漪);YuChangzhao(余常昭);LiangDong(梁栋)(ReceivedJune14,1994;CommunicatedbyBianYingui)THEEQUATIONSOFCOMPLETE... 相似文献
4.
The superconductivity and magnetoresistance (MR) of epitaxial bilayers consisting of YBa2Cu3O7?δ (YBCO) and La0.67Sr0.33MnO3 (LSMO) are investigated with respect to the proximity and spin polarization effects. In the region of the mixed vortex state near the onset temperature of the superconducting transition, the diffusion of the spin-polarized quasiparticles from the LSMO to the YBCO is evidenced by their distinct magnetotransport behaviors, which are characterized by two superconducting transitions. It is revealed that the second transition is strongly dependent on the applied magnetic field, demonstrating an abnormal pair-breaking effect. This effect, together with the reduced MR, is believed to arise from an increase in the spin injection efficiency induced by the suppressed interfacial spin scattering, disclosing a new perspective for understanding the magnetotransport phenomena in proximity-coupled superconductor/ferromagnet (S/F) hybrids. 相似文献
5.
Ferromagnet/superconductor/ferromagnet (F/S/F) spin-valve systems in the dirty limit, described by Usadel equations, was theoretically investigated with respect to superconducting transition temperature. Their superconducting characteristics strongly depend not only on the mutual orientation and thickness of the ferromagnetic layers, but also on the interface transparency as well as magnetic scattering. Especially, the introduction of magnetic scattering drastically reduces the spin-valve effect in our work. The obtained results could be used to understand experimental values of and to provide guidelines for optimizing the experimental systems. 相似文献
6.
In this study, a dynamic model for herringbone planetary gears is proposed which can be applied in the dynamic analysis of variable speed processes (including acceleration, deceleration, and large speed fluctuation process, etc.). The dynamic responses of the acceleration process of an example of a herringbone planetary gear set are simulated in cases where the profile error excitations are ignored and included. The phenomenon of tooth separations can be observed as the rotating speed increases in the simulation, and the effect of the profile error excitations on the phenomenon is also investigated. Furthermore, the effects of the profile error excitations on the vibrations and dynamic meshing forces are investigated before and after the appearance of tooth separations. Moreover, the dynamic characteristics of the herringbone planetary gear set are also compared with that of the spur/helical herringbone planetary gear set briefly. Finally, some advice for the design of planetary gear sets is given to avoid the phenomena of tooth separation and tooth back contacts and suppress the vibrations and dynamic meshing forces. 相似文献
7.
本文针对宽浅型水域,对三维湍流时均方程组逐项进行深度平均,推导出包含自由水面和地形影响的深度平均流动控制方程组.本文还同时获得了深度平均形式的k-ε湍流模型方程组.因计入了水流的三维效应,该模型称为完全深度平均模型.考虑到天然水域几何边界复杂,本文运用较简便的方法,将上述模型方程组交换至正交坐标系下.所得控制方程组可以直接运用于对实际问题的数值模拟. 相似文献
8.
9.
ICP-AES法测定玻璃器皿中铅、镉、砷、锑溶出量的研究 总被引:1,自引:0,他引:1
采用ICP-AES法同时测定玻璃器皿中铅、镉、砷、锑的溶出量,对ICP-AES法测定4%乙酸浸泡液时分析线的选择和射频功率、载气压力的影响,以及基体和共存离子的干扰情况等进行了研究。4种元素的检出限分别为铅0.012mg/L,镉0.0009mg/L,砷0.015mg/L,锑O.015mg/L,加标回收率为97.3%~102.0%,测定结果的相对标准偏差为0.45%~1.36%(n=6). 相似文献
10.