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921.
The lepton-number-violating decays of singly-charged Higgs bosons H^± are investigated in the minimal type-( Ⅰ+Ⅱ ) seesaw model with one SU(2)L Higgs triplet △ and one heavy Majorana neutrino N1 at the TeV scale. We find that the branching ratios B(H^+ → 1α^+υ^-) (for α = e,μ,τ) depend not only on the mass and mixing parameters of three light neutrinos υi (for i = 1, 2, 3) but also on those of N1. Assuming that the mass of N1 lies in the range of 200 GeV to 1 TeV, we figure out the generous interference bands for the contributions of υi and N1 to B(H^+→ 1α^+υ^-). We illustrate some salient features of such interference effects by considering three typical mass patterns of υi, and show that the relevant Majorana CP-violating phases can affect the magnitudes of B(H^+→ 1α^+υ^-)) in this parameter region. 相似文献
922.
We present a design study of a free electron laser (FEL) oscillator for high power THz source experiments on the basis of the Shanghai femtosecond accelerator device. A circular groove guide is used as a new interaction structure. Plane metal meshes are used as upstream and downstream mirrors of the resonator. The general design parameters are presented. We analyzed the spontaneous emission and stimulated emission in the oscillator using these parameters. 相似文献
923.
924.
Superconducting quarter-wave resonators,due to their compactness and their convenient shape for tuning and coupling,are very attractive for low-β beam acceleration.In this paper,two types of cavities with different geometry have been numerically simulated the first type with larger capacitive load in the beam line and the second type of lollipop-shape for 100 MHz,β=0.06 beams then the relative electromagnetic parameters and geometric sizes have been compared.It is found that the second type,whose structural design is optimized with the conical stem and shaping drift-tube,can support the better accelerating performance.At the end of the paper,some structural deformation effects on frequency shifts and appropriate solutions have been discussed. 相似文献
925.
Measurement of Secular Motion Frequency in Miniature Paul Trap to Ascertain the Stability Parameters
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40Ca+ ions are trapped and laser cooled in a miniature Paul trap. The secular motion was observed by the radio-frequency resonance of the ion cloud and Zeeman profile sidebands of a single ion experimentally. The trap stability parameters a and q are determined with an uncertainty under 1% by the secular motion frequency measurement. The trap efficiency is 0.75. A practicable suggestion is given for the benefits of a new trap design. 相似文献
926.
The calcium ions (Ca^2+) spark is an elementary Ca^2+ release event in cardiac myocytes. It is believed to buildup cell-wide Ca^2+ signals, such as Ca^2+ transient and Ca^2+ wave, through a Ca^2+-induced Ca^2+ release (CICR) mechanism. Here the excitability of the Ca^2+ wave in a single cardiac myoeyte is simulated by employing the fire-diffuse-fire model. By modulating the dynamic parameters of Ca^2+ release and re-uptake channels, we find three Ca^2+ signaling states in a single cardiac myoeyte: no wave, plane wave, and spiral wave. The period of a spiral wave is variable in the different regimes. This study indicates that the spiral wave or the excitability of the system can be controlled through micro-modulation in a living excitable medium. 相似文献
927.
Chua 's circuit with a slow-fast effect is established under certain parameter conditions. The dynamics of this slow- fast system is investigated. A spiking phenomenon can be observed in the numerical simulation. By introducing slow-fast analysis and a generalized Jacobian matrix at the non-smooth boundaries, the bifurcation mechanism for the periodic spiking solution, different from the smooth case, is discussed. 相似文献
928.
A Geometrical Model for Tortuosity of Tortuous Streamlines in Porous Media with Cylindrical Particles
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We present a three-dimensional geometry model for tortuosity of streamlines in porous media with randomly placed cylindrical particles. The proposed model is expressed as functions of porosity and geometrical parameters with no empirical constant. This might be helpful for understanding the physical mechanism for tortuosity of streamlines in three-dimensional porous media. The model predictions are found to be in good agreement with the experimental data available. 相似文献
929.
We present the first study of CP asymmetry in ∧b → ∧l^+l^- decay when a new weak phase comes through the extension of three-generation standard model to the four-generation standard model. Taking |Vt′s^*Vt′b| = 0.01, 0.02, 0.03 with phase {60° - 120°}, which is consistent with the b → sl^+l^- rate and the Bs mixing parameter △mBs, we find out that CP asymmetry is quite sensitive to the existence of fourth generation. It can serve as a good tool to search for new physics effects, in particular, to search for the fourth generation quarks (t′, b′) via their indirect manifestations in loop diagrams. 相似文献
930.
最近,赵凯华先生在<物理>上发表了一篇行文优美的文章[1],对"Adiabatic"一词在物理学中的用法和含义,进行了历史性阐述,厘清了它是如何从热力学中的"绝热"演变为量子理论中"无限缓慢(浸渐)"的. 相似文献