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排序方式: 共有1210条查询结果,搜索用时 31 毫秒
51.
52.
李龙顺 《中国民航学院学报》1993,11(3):51-55
本文简要介绍了放映氙灯电源的现状,详细研究了由中国民航学院三维显示技术研究所最新研制成功的放映氙灯电源中的稳流及稳纹波电路的设计思想和工作原理。理论分析和实验结果表明,本文设计的稳流及稳纹波电路显著地提高了氙灯电源的可靠性及减小了氙灯电流的纹波系数且操作简便,利于推广应用。 相似文献
53.
The spectral and polarization properties of thermal cyclotron radio emission from a hot coronal loop with a current along the axis are computed. The magnetic field is supposed to have a component along the loop axis as well as a poloidal part due to the current, both components being of comparable magnitude. In this specific configuration a helical magnetic field is present with a remarkable minimum of its absolute value along the loop axis and a maximum at its periphery. The presence of one or two maxima of magnetic field value along the line of sight results in increasing optical thickness of the gyroresonance layers at appropriate frequencies in the microwave band and, therefore, in enhanced radio emission at those harmonics which are optically thin (for example,s=4). These cannot be observed in models with the commonly employed magnetic field configuration (longitudinal along the loop axis).We show that the frequency spectrum of thermal cyclotron radiation from a hot coronal loop with a helical magnetic field differs from that of the standards-component source (with smooth frequency characteristics and polarization corresponding toe-mode) in that plenty of fine structures (line-like features and cut-offs) are present and theo-mode is prevalent in some frequency intervals. The enhanced radio emission at high harmonics and the complicated form of frequency spectrum in the model considered imply that some microwave sources, which are poorly explained in traditional models of solar active regions, may be associated with helical magnetic fields in hot coronal loops. Computations allow one to indicate spectral and polarizational peculiarities of local sources testifying to the presence of a helical magnetic field. 相似文献
54.
55.
José Luis Ballester 《Space Science Reviews》2005,121(1-4):105-113
Prominence seismology is a rapidly developing topic which seeks to infer the internal structure and properties of solar prominences
from the study of its oscillations. An extensive observational background about oscillations in quiescent solar prominences
has been gathered during the last 70 years. These observations point out the existence of two different types of oscillations:
Flare-induced oscillations (winking filaments) which affect the whole prominence and are of large amplitude and small amplitude
oscillations which seem to be of local nature. From the theoretical point of view, few models have been set up to explain
the phenomenon of winking filaments while, on the contrary, for small amplitude oscillations a large number of models trying
to explain the observed features have been proposed. 相似文献
56.
Nat Gopalswamy 《Space Science Reviews》2006,124(1-4):145-168
Interplanetary coronal mass ejections (ICMEs) originating from closed field regions on the Sun are the most energetic phenomenon
in the heliosphere. They cause intense geomagnetic storms and drive fast mode shocks that accelerate charged particles. ICMEs
are the interplanetary manifestations of CMEs typically remote-sensed by coronagraphs. This paper summarizes the observational
properties of ICMEs with reference to the ordinary solar wind and the progenitor CMEs. 相似文献
57.
Magnetic reconnection is a universal phenomenon where energy is efficiently converted from the magnetic field to charged particles
as a result of global magnetic topology changes during which earlier separated plasma regions become magnetically connected.
While the reconnection affects large volumes in space most of the topology changes and of the energization occur within small
localized regions. Regions of special importance are the X-region and the separatrix region. The understanding of the microphysics
of these regions is crucial for the overall understanding of the reconnection. The Earth magnetosphere is the best environment
where the details of these regions can be studied in situ. We summarize their main properties and discuss recent spacecraft observations. 相似文献
58.
潜在电路分析中的拓扑模式识别算法研究 总被引:2,自引:0,他引:2
在网络树拓扑识别理论的分析方法与算法基础上 ,推导出网络树特定的五种基本拓扑模式识别的工程算法 ,以解决计算机对电路网络树进行自动拓扑识别问题。 相似文献
59.
V.M. Lipunov 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1984,3(10-12)
The general aproach is considered which describs the evolution of neutron stars in terms of their interaction with surrounding matter. All possible states of neutron stars are classified from this point of view. Classification and evolution of binaries contaning neutron stars are also considered. 相似文献
60.
P. Mszros 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1984,3(10-12)
The key radiative processes are discussed, numerical methods of magnetized radiative transfer are presented, and these are considered in their application to X-ray pulsar models. 相似文献