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731.
Zhengli Wang Jiguang Lu Jingchen Jiang Shunshun Cao Weiyang Wang Enwei Liang Renxin Xu 《Astronomische Nachrichten》2024,345(2-3):e240010
Pulsar electrodynamics could be relevant to the physics of stellar surface, which remains poorly understood for more than half a centenary and is difficult to probe due to the absence of direct and clear observational evidence. Nevertheless, highly sensitive telescopes (e.g., China's Five-hundred-meter Aperture Spherical radio Telescope, FAST) may play an essential role to solve the problem since the predicted surface condition would have quite different characteristics in some models of pulsar structure, especially after the establishment of the standard model of particle physics. For instance, small hills (or “zits”) may exist on solid strangeon star surface with rigidity, preferential discharge, that is, gap sparking, may occur around the hills in the polar cap region. In this work, with the 110-min polarization observation of PSR B0950 08 targeted by FAST, we report that the gap sparking is significantly non-symmetrical to the meridian plane on which the rotational and magnetic axes lie. It is then speculated that this asymmetry could be the result of preferential sparking around zits which might rise randomly on pulsar surface. Some polarization features of both single pulses and the mean pulse, as well as the cross-correlation function of different emission regions, have also been presented. 相似文献
732.
733.
井间电阻率层析成象的几个问题研究 总被引:2,自引:0,他引:2
井间电阻率层析成象是一种较新的高精度电法勘探方法,尚有许多问题需要探讨。本文针对平滑度约束反演算法,研究了平滑因子及迭代次数对成象结果的影响,给出了约束条件的施加方法。 相似文献
734.
The vibrations of railway tracks on a poroelastic half‐space generated by moving trains are investigated through a vehicle–track–ground coupling model. The theoretical model incorporates a vehicle, a track, and a fully saturated poroelastic half‐space soil medium. The source of vibration excitation is divided into two components: the quasi‐static loads and the dynamic loads. The quasi‐static loads are related to the static component of the axle loads, whereas the dynamic loads are due to the dynamic wheel–rail interaction. A linear Hertizian contact spring is introduced between each wheelset and the rail to consider the dynamic loads. Biot's dynamic theory is used to characterize the poroelastic half‐space soil medium. Using the Fourier transform, the governing equations for the track–ground system are solved and the numerical results are presented for a single axle vehicle model. The different dynamic characteristics of the elastic soil medium and the saturated poroelastic medium are investigated. In addition, the different roles of the moving axle loads and the roughness‐induced dynamic loads are identified. It is concluded that the vibration level of the free field off the track predicted by the poroelastic soil medium is smaller than that predicted by the elastic soil medium for vehicle speed below the Rayleigh wave speed of the poroelastic half‐space, whereas it is larger for vehicle speed above the Rayleigh wave speed. The dynamic loads play an important role in the dynamic responses of the track–ground system. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
735.
通过对后大雪金矿13件光片的系统观察统计及电子探针分析,研究了金矿物的赋存状态,形态和粒度,化学成分,金的成色等特征及其变化规律,并分析探讨了其在矿床成因,成矿远景评价等方面的应用和意义。 相似文献
736.
Luo Zhaohua Xiao Xuchang Cao Yongqing Mo Xuanxue Su Shangguo Deng Jinfu Zhang Wenhui 《中国科学D辑(英文版)》2001,44(1):10-17
Geodynamic properties and evolution of the lithosphere on the north margin of the Tibetan Plateau are recently hot topics to geoscientists in the world. Have the northern plates been subducting underneath the Plateau? It is still an unsolved problem. One of the keys to solving this problem is to understand the genetic processes of Cenozoic magmas on the north margin of the Tibetan Plateau. However, there is no enough evidence supporting the subduction model. In contrast, a series of evidence indicates that collision-induced huge shearing faults and large-scale crust shortening played a main role in lithosphere motion on the north margin of the Tibetan Plateau. The mantle-derived igneous rocks strictly distribute at the intersections of large strike-slip faults on the north margin of the Plateau. Generation of magmas may be related to local extensional condition induced by strike-slipping faults, which lead to lithosphere gravitational instability and collapse, as well as upwelling of the deep hot material. Heat induced by shearing and carried by upwelling hot material may cause partial melting on H2O-bearing mantle. 相似文献
737.
本文通过区域的连续映射推导了一种映射半解析边界元法,将其应用于界面裂纹问题的动力分析,可大大减小计算一。典型算例的结构表明,本文方法是非常有效的,并可推广应用于三维复杂形状裂纹的计算问题。 相似文献
738.
ApossibleULFseismicelectro-magneticemissionXing-CaiLI;(李兴才)Hui-XinCAO;(曹惠馨)Tie-HongYU;(俞铁宏)andZhi-YongCHEN;(@2陈智勇)(Instituteo... 相似文献
739.
云南强震轮回是研究本世纪94年间,云南强震随时间、区域有序转移的过程和规律。本文介绍这一观点的形成、基本内容和主要特征,并用这一观点对云南当前及未来强震趋势作了讨论。 相似文献
740.