Results 1 - 10 of 65133
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[en] We present the analytical results at the mean-field level for the asymmetrical fermion system with attractive contact interaction at zero temperature. The results can be expressed in terms of linear combinations of the elliptic integrals of the first and second kinds. In the limit of small gap parameter, we discuss how the asymmetry in fermion species affects the phases of the ground state of the system. In the limit of large gap parameter, we show that two candidate phases are competing for the system's ground state. The Sarma phase containing a pure Fermi fluid and a mixed condensate is favored at a large degree of asymmetry. The separated phase consisting of a pure Fermi fluid and a boson condensate supports the system at a small degree of asymmetry. The two phases are degenerate in the limit of infinite pairing gap
[en] This paper proposes the principle of SMES capacity determination for power system stable operation. Adopting the energy function method, the mechanism of SMES damping power oscillation in the classical single-machine infinite-bus (SMIB) system is analyzed. The released kinetic energy during disturbance is the original of power system oscillation, which is taken as the principle of SMES capacity determination. Then, the influence of fault type, fault position, and fault clearing time on the SMES capacity determination are discussed. Using MATLAB simulation, the principle of SMES capacity determination is evaluated.
[en] The role of hybrid pairing originating from electron-phonon interaction has been investigated for a two band (f and d) superconductor at T = O. This type of pairing seems to be less important than f-f pairing for the case of half-filled f-band when the latter type of Cooper pairs plays the dominating role. On the other hand, for the case of rather filled (or rather empty) f-band, the superconducting properties of the system are mainly determined by the formation of conduction electrons d-d pairs. (author)
[en] The transverse decoherence of the kicked beam due to amplitude dependent tune shift and the linear and the second order chromaticity are studied. For the kicked beam the closed analytical expression for the beam centroid evolution in subsequent turns is obtained. Analysis of the kicked beam centroid signal on the machine optical characteristics is given.
[en] Many important classes of surface reactions exhibit both high heats of reaction and large, positive activation energies. In addition, many surface reactions often occur in thermally isolated environments. As a result, significant autothermic effects are possible. In part I of this article, a generalized model of these effects is presented which describes the enhancement in reaction rate as a function of activation energy, bulk temperature, and a parameter termed the characteristic temperature. Reactant concentration and reaction order effects are also considered. Part II of this work presents the application of this model to numerous experimental plasma etching data
[en] We discuss theoretically the properties of an electromechanical oscillating system whose operation is based upon the cyclic conservative conversion between gravitational potential, kinetic and magnetic energies. The system consists of a superconducting coil subjected to a constant external force and to magnetic fields. The coil oscillates and has induced in it a rectified electrical current whose magnitude may reach hundreds of amperes. The design differs from that of most conventional superconductor machines since the motion is linear (and practically unnoticeable depending on frequency) rather than rotatory and it does not involve high speeds. Furthermore, there is no need for an external electrical power source to start up the system. We also show that the losses for such a system can be made extremely small for certain operational conditions, so that by reaching and keeping resonance the system's main application should be in the generation and storage of electromagnetic energy. (rapid communication)
[en] We investigate changes in superfluid weight in photo-excited states. This quantity is obtained by a microscopic calculation of the third-order nonlinear response function on the assumption that the pumping intensity is low. The resultant expression includes the energy dependence of self-energy explicitly. The importance of this dependence is shown by performing numerical calculations with the electron-boson interaction included. Moreover, it is found that the vertex correction makes a predominant contribution to the photoinduced change in superfluid weight. The similarity between the linear and photoinduced responses in its temperature dependence is discussed, and a quantitative estimation of the calculated results is made in comparison with that of the experiments. (author)
[en] A new method for choosing a reference pair potential for atomic fluids is presented. This method and the optimized cluster theory are used to calculate pair distribution functions for a number of classical fluids. The results indicate that pair distribution functions obtained by this method are very accurate for fluids which have a repulsive pair potential