共查询到20条相似文献,搜索用时 140 毫秒
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利用两部智能手机,借助手机软件phyphox在家进行了多普勒效应实验.两部手机分别作为接收器和声源,让接收器和声源分别做自由落体运动,测得了接收频率和运动速度随时间的变化曲线,通过对数据的处理得到了声速和重力加速度值,并和理论值进行了对比,验证了用手机进行多普勒效应实验的可靠性,为以后实验的进行以及数据处理提供了参考. 相似文献
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为了在实验室条件下模拟舵机系统实际飞行时所受的气动载荷,实现舵机部件和整机的动静态测试,设计了基于虚拟仪器的舵机综合测试系统。针对舵机测试系统自动化化和综合化需求,基于PXI架构和LabWindows/CVI平台,完成了测试系统的硬件设计和软件设计,采用异步定时器实现了实时数据采集,采用tdms数据流实现了大容量高速数据的记录,运用多线程实现了良好的人机交互与流畅的曲线显示,采用ActiveX技术调用Excel实现了测试报表的自动生成。使用和测试结果表明,该测试系统显著提高了舵机测试的效率和精确度以及自动化水平,使用方便,性能稳定,为舵机性能测试和设计优化提供了可靠保障。 相似文献
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基于固体的熔化和凝固实验的传统做法,结合现代测量技术对其进行了改进,对晶体海波和非晶体石蜡的熔化和凝固进行了全程监控,取得了很好的实验效果并节省了实验时间,提高了实验的准确性. 相似文献
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EAST中央控制系统 总被引:2,自引:0,他引:2
描述了EAST中央控制系统和EAST虚拟合作实验室系统的体系结构和各个部分的主要功能和设计思想。EAST中央控制系统主要功能是协调统一各个控制、诊断、采集子系统,为各个子系统提供统一的控制接口。EAST中央控制系统制定和规范了与各分控系统之间的通信协议,加强了对各分控系统的控制,统一和规范了控制数据的发布和控制参数的设置。系统按照功能模块设计和实施,有效地提高了系统的升级和扩展能力。 相似文献
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The Møller energy(due to matter and fields including gravity) distribution of the traversable Lorentzian wormhole space-time by the scalar field or electric charged is studied in two different approaches of gravity such as general relativity and tele-parallel gravity. The results are found exactly the same in these different approximations. The energy found in tele-parallel gravity is also independent of the tele-parallel dimensionless coupling constant, which means that it is valid in any tele-parallel model. Our results sustains that (a) the importance of the energy-momentum definitions in the evaluation of the energy distribution of a given space-time and (b) the viewpoint of Lassner that the Møller energy-momentum complex is a powerful concept of energy and momentum. 相似文献
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Journal of Experimental and Theoretical Physics - The interaction of two charged dielectric spheres, the radius of one of which is much larger than the radius of the other sphere, is considered for... 相似文献
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The motion of the shell of charged testparticles falling radially from rest at infinity withzero total angular momentum onto a Kerr–Newmanblack hole is studied. The shell, initially spherical,becomes prolate along the axis of symmetry of the holeduring the fall. The shape of the shell from theviewpoint of distant observers is characterized by meansof the photons moving along geodesics of the outgoing principal null congruence. The motion of theshell is examined analytically for large distances andnear the horizon. In the special case, when at largedistances of the hole the attractive Newtongravitational force is compensated by the repulsive Coulombforce, the complete motion is given explicitly in termsof elementary functions. 相似文献
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F. Caravenna F. den Hollander N. Pétrélis J. Poisat 《Mathematical Physics, Analysis and Geometry》2016,19(1):2
This paper studies an undirected polymer chain living on the one-dimensional integer lattice and carrying i.i.d. random charges. Each self-intersection of the polymer chain contributes to the interaction Hamiltonian an energy that is equal to the product of the charges of the two monomers that meet. The joint probability distribution for the polymer chain and the charges is given by the Gibbs distribution associated with the interaction Hamiltonian. The focus is on the annealed free energy per monomer in the limit as the length of the polymer chain tends to infinity. We derive a spectral representation for the free energy and use this to prove that there is a critical curve in the parameter plane of charge bias versus inverse temperature separating a ballistic phase from a subballistic phase. We show that the phase transition is first order. We prove large deviation principles for the laws of the empirical speed and the empirical charge, and derive a spectral representation for the associated rate functions. Interestingly, in both phases both rate functions exhibit flat pieces, which correspond to an inhomogeneous strategy for the polymer to realise a large deviation. The large deviation principles in turn lead to laws of large numbers and central limit theorems. We identify the scaling behaviour of the critical curve for small and for large charge bias. In addition, we identify the scaling behaviour of the free energy for small charge bias and small inverse temperature. Both are linked to an associated Sturm-Liouville eigenvalue problem. A key tool in our analysis is the Ray-Knight formula for the local times of the one-dimensional simple random walk. This formula is exploited to derive a closed form expression for the generating function of the annealed partition function, and for several related quantities. This expression in turn serves as the starting point for the derivation of the spectral representation for the free energy, and for the scaling theorems. What happens for the quenched free energy per monomer remains open. We state two modest results and raise a few questions. 相似文献
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M.Ya. Azbel 《Physics letters. A》1980,77(5):347-349
It is shown that the interaction of bosons in a random potential in certain cases provides extended states. 相似文献
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Recent research shows that Hawking radiation from black hole horizon can be treated as a quantum tunneling process, and fermions tunneling method can successfully recover Hawking temperature. In this tunneling framework, choosing a set of appropriate matrices γ^μ is an important technique for fermions tunneling method. In this paper, motivated by Kerner and Man's fermions tunneling method of 4 dimension black holes, we further improve the analysis to investigate Hawking tunneling radiation from a rotating charged black hole in 5-dimensional gauged supergravity by constructing a set of appropriate matrices γ^μ for general covariant Dirac equation. Finally, the expected Hawking temperature of the black hole is correctly recovered, which takes the same form as that obtained by other methods. This method is universal, and can also be directly extend to the other different-type 5-dimensional charged black holes. 相似文献
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Recent research shows that Hawking radiation from black hole horizoncan be treated as a quantum tunneling process, and fermions tunneling method can successfully recover Hawking temperature. In this tunneling framework, choosing a set of appropriate matrices γμ is an important technique for fermions tunneling method. In this paper, motivated by Kerner and Man's fermions tunneling method of 4 dimension black holes, we further improve the analysis to investigate Hawking tunneling radiation from a rotating charged black hole in 5-dimensional gauged supergravity byconstructing a set of appropriate matrices γμ for general covariant Dirac equation. Finally, the expected Hawking temperature of the black hole is correctly recovered, which takes the same form as that obtained by other methods. This method is universal, and can also be directly extend to the other different-type 5-dimensional charged black holes. 相似文献
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It is shown that the features of formation and structure of a stationary charged layer at the interface between a symmetric
plasma and a wall depend to a considerable extent on the ratios τ± (for both plasma components) of the thermal velocity to the velocity of the plasma flow at the beginning of the layer, as
well as on the polarity and magnitude of electric potential φW of the wall. The conditions under which a double layer-type structure can be formed in the near-wall layer of the symmetric
plasma are formulated. The charge double layer contains two sublayers with opposite polarities of charge for a fixed polarity
of the wall. The charge polarity of sublayer adjoining the plasma is opposite to the polarity of the wall, while the sublayer
adjoining the wall has a charge of the same polarity as that of the wall. The ranges of symmetric plasma parameters for which
the double layer exists are determined. It is found that a structure of this type can be formed nor for all parameters of
the plasma, for which a charged layer exists; the possibility of formation of this structure depends on τ± as well as on the sign of the potential of the wall. 相似文献