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排序方式: 共有117条查询结果,搜索用时 15 毫秒
111.
对中国大陆5.0级以上强震的后续地震进行了分析,按成因将其划分为剩余型、诱导型和后生型3类。讨论了3种后续地震的主要特征及其在大震震源机理研究和地震预报中的意义。 相似文献
112.
On May 4, 1998, at 0227 UT an interplanetary shock crossed the WIND spacecraft, and half an hour later a Sudden Commencement occurred. Coinciding with the Sudden Commencement a rapid intensification of the flux of particle precipitation into the ionosphere was observed. Evidence is presented that the ionospheric electric fields were influenced by the associated dynamic variations of the ionospheric conductivities. Following the initial phase the ionospheric flow speeds increased rapidly over the next 20 min to more than 2000 m/s, in agreement with an increased effective coupling of the solar wind energy to the magnetosphere following the interplanetary shock that caused the Sudden Commencement. These strong flows were meandering in latitude, a type of plasma flow modulation that has been reported before to occur during Omega band events: a string of alternating field-aligned currents propagating eastward. The riometer absorption was found to be at a minimum in regions associated with outward directed field aligned currents. The riometer absorption regions (the regions of particle precipitation) were drifting with E × B drift speed of the ionospheric electrons. 相似文献
113.
C. Courtois R. A. D. Grundy A. D. Ash D. M. Chambers R. O. Dendy K. G. Mcclements N. C. Woolsey 《Astrophysics and Space Science》2005,298(1-2):93-98
Results from a scaled, collision-free, laser-plasma experiment designed to address aspects of collisionless plasma interaction
in a high-plasma β supernova remnant (SNR) are discussed. Ideal magneto-hydrodynamic scaling indicates that the experimental
plasma matches the SNR plasma at 500 ps. Experimental data show that the magnetic field can alter the plasma density profile
when two similar plasmas interact in a colliding geometry. These results are not explained by magnetic-field pressure; they
do, however, suggest magnetic field penetration that localizes the plasma particles to the Larmor radius, which appears smaller
than the size of the experiment and the particle mean-free paths and may thus increase the effective collisionality of the interacting plasma system. 相似文献
114.
We report submillimeter CO(6-5) observations around 15 nearby young stellar objects of low mass. The correlation between linewidth and peak temperature indicates shock heating of dense gas, presumably at the origin of molecular outflows. 相似文献
115.
Sandip K. Chakrabarti 《Journal of Astrophysics and Astronomy》1988,9(4):185-192
We study the effects of the presence of vortex rings surrounding a supersonic radio jet inside the cocoon of a radio lobe.
We show that both the jet and the shocked ambient medium are pinched. Flow speed inside the cocoon is always close to the
sonic value and it stays so by successively passing through several oblique shocks. We also discuss the possibility of the
non-linear growth of the instabilities of the contact surface to explain the numerical results in the literature. 相似文献
116.
This study investigates the stability of a class of radiating viscous self-gravitating stars with axial symmetry having anisotropic pressure. We use perturbation technique to establish the perturbed form of the Einstein field equations and dynamical equations. The instability range in the Newtonian and post-Newtonian eras has been analyzed by constructing the collapse equation. It is found that the adiabatic index has a key role in the discussion of instability ranges which depends upon the physical parameters, i.e., energy density, anisotropic pressure and shear viscosity of the fluid and heat flux. We conclude that the shear viscosity decreases the instability range and makes the system more stable. 相似文献
117.