共查询到18条相似文献,搜索用时 93 毫秒
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计算了两共轴均匀带电圆环的相互作用能,并求出它们之间的相互作用力,绘制出电场力的空间分布图,进而讨论了作用力和两圆环半径和中心距离等参量的关系. 相似文献
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推导出了两共轴带电细圆环相互作用力的级数解,对其收敛性、误差进行了定量分析,并根据级数解用MATLAB编程计算绘制了相互作用力F_z的分布曲线. 相似文献
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为实现超导重力仪磁悬浮力的精确计算,以GWR型超导重力仪为模型基础,采用有限元的思想,将超导球表面电流理想化为多个等高共轴电流环,计算出各个电流环与超导线圈的作用力,求和得到线圈与超导球间的磁悬浮力。利用MATLAB完成计算程序实现,通过改变下线圈电流和上、下线圈电流比,获得满足一定条件的磁悬浮力及其梯度。选取合适的模型参数,计算出线圈对质量为m=4.069 g超导球的磁悬浮力大小为:Ftotal=3.988×10^-2N,磁悬浮力梯度为:-9.699×10^-3N/m,此时悬浮力梯度合适,满足系统稳定性和灵敏度的要求。 相似文献
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利用带电圆环电场的轴对称性,联合运用静电场的高斯定理和安培环路定理,以轴线上的场强值为初值,巧妙地导出了均匀带电圆环空间电场的无穷级数表达式,进而计算出了共轴均匀带电圆环之间的相互作用力. 相似文献
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Demosthenes Kivotides 《Physics letters. A》2019,383(14):1601-1606
Interactions between magnetic and vortex rings are studied over a wide interval of interaction parameter values ranging from negligible magnetic effects on vorticity structure, to very strong effects. The employed interaction parameter measures the strength of the Lorentz force in units of the inertial force. At small interaction parameters, the vortex ring shapes part of the magnetic ring into a dissipative, curved, magnetic sheet structure. At high interaction parameters, the Lorentz force acts as an agent of proliferation of vortex rings, since it generates two vortex rings adjacent to the original magnetic structure, one of which is pulled (together with the advected magnetic field) into the wake of the original vortex ring, while the other escapes, ready to interact with another magnetic ring. Once within the initial vortex ring wake, both magnetic and vorticity structures are stretched into spirals, whilst the Lorentz force continuously generates new, intense vorticity at high magnetic field sites. 相似文献
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M. I. Bataronova S. A. Kostryukov V. V. Peshkov G. E. Shunin 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(9):1202-1205
The energy and interaction force of two superconducting rings with constant magnetic fluxes have been calculated by the finite-element method. It is shown that the ring-interaction energy is minimum in the case of unequal codirectional magnetic fluxes. 相似文献
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We derive analytic formulae for the electrostatic force between ring and disc charge distributions inside a grounded metallic pipe using the Green’s function technique. These distribution models are useful in the modeling of electron beams commonly employed in microwave tubes. We analyze the electric force between two discs, between two rings, and between a disc and a ring and we compare the results for the electric potential, field, and force to numerical ones obtained from a 3D electrostatic solver. Present expressions were developed to avoid an oscillatory noise when the field diverges by axial proximity between source and observer. 相似文献
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We study the electron transport in three terminal junctions and quantum rings looking for the classical deflection of electron trajectories in the presence of intersubband scattering. We indicate that although the Aharonov-Bohm oscillations and the Lorentz force effects co-exist in the low subband transport, for higher Fermi energies a simultaneous observation of both effects is difficult and calls for carefully formed structures. In particular, in quantum rings with channels wider than the input lead the Lorentz force is well resolved but the Aharonov-Bohm periodicity is lost in chaotic scattering events. In quantum rings with equal lengths of the channels and T-shaped junctions the Aharonov-Bohm oscillations are distinctly periodic but the Lorentz force effects are not well pronounced. We find that systems with wedge-shaped junctions allow for observation of both the periodic Aharonov-Bohm oscillations and the magnetic deflection. 相似文献
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《中国物理 B》2021,30(5):56802-056802
Nanographenes(NGs) can be embedded with predesigned dopants or nonhexagonal rings to tailor the electronic properties and provide ideal platforms to study the unique physical and chemical properties. Here, we report the onsurface synthesis of NBN-doped NG embedded with five-and seven-membered rings(NBN-575-NG) on Au(111) from a oligophenylene precursor preinstalled with a NBN unit and a heptagonal ring. Scanning tunneling microscopy and noncontact atomic force microscopy images elucidate the intramolecular cyclodehydrogenation and the existence of the fiveand seven-membered rings. Scanning tunneling spectroscopy spectra reveal that the NBN-575-NG is a semiconductor,which agrees with the density functional theory calculation results on a freestanding NBN-575-NG with the same structure.This work provides a feasible approach for the on-surface synthesis of novel NGs containing non-hexagonal rings. 相似文献
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The mechanism leading to the observed coexistence of gaps and narrow ringlets in the planetary rings is found. It is based upon the quasi-stationary radial drift of the matter under action of two forces in the disk plane: the Coriolis force and the Reynolds stresses. To an accuracy of the factor of 2 the first force coincides with the Lorentz force, therefore the radial drift in rings is similar to the gradient drift of plasma in the magnetic field. The second force is produced by the wave generated by the nearby satellite in the resonance position. In inertial systems, the second force alone causes a matter flow in its direction, called acoustic streaming. Since the radial drift is caused by nonlinear time-averaged force of high-frequency harmonic interactions in the wave, it exists in the wave propagation zone: from the birth place of the wave-the resonance position, up to the reflection point of the wave, where its group velocity vanishes. Our estimations show that the size of the density wave propagation zone corresponding to the density wave which had been formerly generated the 2:1 orbital resonance with Mimas is consistent with the width of the Cassini Division. In our case the nature of the radial drift is such that first of all it clears out the farthest from the resonance position; later, the closer areas also get affected by the drift. The zone closest to the resonance position itself is the last to be involved in the process. The matter carried away by the drift is partially accumulated near the resonance position forming a narrow dense ringlet. (c) 1996 American Institute of Physics. 相似文献
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采用化学气相沉积方法制备的碳纳米管,用酸溶液进行弱氧化处理,经适当温度在大气中烧 灼后碳纳米管发生弯曲,在样品中出现大量的环状结构. 利用原子力显微镜、透射电子显微 镜和扫描电子显微镜对典型环直径为300 nm的碳纳米管环进行了表征. 烧灼温度和烧灼时间 对环的结构和产率有重要的影响. 实验数据统计结果表明,烧灼温度在510—530℃区间内 可得到超过40%的碳纳米管环产率,并且烧灼时间延长到120 min有利于提高碳纳米管环的产 率. 在加热情况下,碳纳米管端结合的羧基官能团脱水成酯,导致弯曲的碳纳米管结合成环 .
关键词:
碳纳米管环
化学气相沉积 相似文献