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脉冲星自转周期不稳定的研究
脉冲星 频率稳定度 时间噪声 自转突变
2011/9/25
本文讨论了脉冲星自转周期的不稳定性，为脉冲星脉冲到达时间的分析模型提供理论依据，并着重分析了不规则减速中的时间噪声和自转突变问题，为研究脉冲星内部结构和定义高精度的脉冲星时提供宝贵的信息。
Photospheric Signatures of Granular-scale Flux Emergence and Cancellation at the Penumbral Boundary
Photospheric Signatures Granular-scale Flux Emergence Cancellation Penumbral Boundary
2011/7/26
We studied flux emergence events of sub-granular scale in a solar active region. New Solar Telescope (NST) of Big Bear Solar Observatory made it possible to clearly observe the photospheric signature ...
Luminosities of recycled radio pulsars in globular clusters
stars: neutron — pulsars: general — methods:general — globular clusters: individual
2011/7/22
Using Monte Carlo simulations, we model the luminosity distribution of recycled pulsars in globular clusters as the brighter, observable part of an intrinsic distribution and find that the observed lu...
Revision of the 15N(p,γ)16O reaction rate and oxygen abundance in H-burning zones
physical data processes: nuclear reactions abundances
2011/7/22
The NO cycle takes place in the deepest layer of a H-burning core or shell, when the temperature exceeds T {\simeq} 30 {\cdot} 106 K. The O depletion observed in some globular cluster giant stars, alw...
Shapes and gravitational fields of rotating two-layer Maclaurin ellipsoids: Application to planets and satellites
two-layer Maclaurin ellipsoids: Application to planets and satellites
2011/7/20
The exact solution for the shape and gravitational field of a rotating two-layer Maclaurin ellipsoid of revolution is compared with predictions of the theory of figures up to third order in the small ...
Pulsar state switching, timing noise and free precession
dense matter – stars: neutron – stars: oscillations – stars: pulsars –stars: rotation
2011/7/18
Recent radio pulsar observations have shown that a number of pulsars display interesting long term periodicities in their spin-down rates. At least some of these pulsars also undergo sharp changes in ...
Weak-field limit of Kaluza-Klein models with spherical compactification I: problematic aspects
Weak-field limit Kaluza-Klein models spherical compactification problematic aspects
2011/7/18
We investigate classical gravitational tests for the Kaluza-Klein model with spherical compactification of the internal two-dimensional space. In the case of the absence of a multidimensional bare cos...
地球自转速率变化的实时快速预报
实时预报 地球自转速率 大气角动量 神经网络
2007/8/15
地球自转速率变化的实时快速预报具有重要的科学意义和实际应用价值. 然而由于地球自转速率复杂变化(或日长变化)的时变特性, 传统的线性时间序列分析方法往往难以取得良好的预报效果. 采用非线性的人工神经网络技术预报日长变化, 网络的拓扑结构由最小均方误差法确定. 考虑到日长变化与大气环流运动间的密切联系, 在神经网络预报模型中首次引入轴向大气角动量的实时预报值, 进行日长变化1~5 d的实时快速预报....