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141.
我国西南地区一次暴雨过程特征及成因 总被引:2,自引:1,他引:1
利用卫星云图、多普勒天气雷达资料和高空风等各种天气学资料,对2009年6月8—9日广西、贵州、以及和湖南交界地带的一次暴雨过程进行了综合分析。结果表明,暴雨是由中尺度对流复合体东移、β中尺度强对流云团发展、以及二者合并造成的;地面α中尺度低压带配合α中尺度纬向切变线的生成,为中尺度对流复合体(mesoscale convective complex,MCC)的东移发展、β中尺度强对流云团的发展、以及二者的合并创造了有利条件;地面能量比低值舌的活动是MCC和β中尺度强对流云团生成和发展的触发机制之一;在多普勒雷达径向速度图上,MCC的生成和发展,伴随西南低空急流的建立和维持,大范围的逆风区的生成;MCC的消亡,伴随西南低空急流的减弱和消失,对应西北气流建立和东扩。MCC发展期和β中尺度强对流云团发展期、MCC消散期和β中尺度强对流云团消散期的涡度收支以及视热源和视水汽汇有很大的不同。 相似文献
142.
143.
Xue-Peng Chen Yong-Qiang Yao Purple Mountain Observatory Chinese Academy of Sciences Nanjing 《中国天文和天体物理学报》2004,4(3):284-298
Near-infrared images and K-band spectroscopy of the massive star-forming region IRAS 23151+5912 are presented. The JHK' images reveal an embed-ded infrared cluster associated with infrared nebula, and the H_2 (2.12μm) narrow-band image provides for the first time evidence of outflow activity associated withthe cluster. That the cluster is young can be shown by the high percentage ofinfrared excess sources and the outflow activity. We suggest an age of the clus-ter of ~ 10~6yr. Eight young stars are found in the bright nebular core aroundIRAS 23151+5912. By the color-magnitude diagrams of the cluster, we found fivehigh--mass YSOs and four intermediate-mass YSOs in the cluster. Eight H_2 emissionfeatures are discovered in the region with a scattered and non-axisymmetric distri-bution, indicating the existence of multiple outflows driven by the cluster. DiffuseH_2 emission detected to the north and to the west of the cluster may result fromUV leakage of the cluster. Brγ, H_2, and CIV emission lines are 相似文献
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145.
中国古代有着大量的对于流星和流星雨的观测记录,最早可以追溯到3000多年以前。在这些珍贵的记录中,不仅有对于流星的一般描述,而且还有一些至今不能完全理解的特殊流星现象的记录。基于现代对电声变换流星声、流星体的螺旋线形运动、流星的颜色变化和流星的分裂等等的研究,列出在中国古代文献中可以查找到的有关记录。这些记录,不仅是世界文化宝库的一部分,而且对于今天的研究仍有实用价值。对电声变换流星声的报道,只是近20年来,才确立了的并非是观测者的臆想。流星的现代彩色照相观测,更真实地记录和展现了其他的特殊流星现象和它们的发生与演变。这些古代记录与现代的流星观测的对比,可以起到相互印证的作用。 相似文献
146.
De-Chun Liao Yong-Hong Zhou Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai National Astronomical Observatories Chinese Academy of Sciences Beijing 《中国天文和天体物理学报》2004,4(3):247-257
We apply complex Morlet wavelet transform to three polar motion dataseries, and derive quasi-instantaneous periods of the Chandler and annual wobbleby differencing the wavelet transform results versus the scale factor, and then findtheir zero points. The results show that the mean periods of the Chandler (annual)wobble are 430.71±1.07 (365.24±0.11) and 432.71±0.42 (365.23±0.18) mean solardays for the data sets of 1900-2001 and 1940-2001, respectively. The maximumrelative variation of the quasi-instantaneous period to the mean of the Chandlerwobble is less than 1.5% during 1900-2001 (3%--5% during 1920-1940), and thatof the annual wobble is less than 1.6% during 1900--2001. Quasi-instantaneous andmean values of Q are also derived by using the energy density-period profile of theChandler wobble. An asymptotic value of Q = 36.7 is obtained by fitting polynomialof exponential of σ~(-2) to the relationship between Q and σ during 1940--2001. 相似文献
147.
148.
Li-Hua Ma De-Chun Liao Yan-Ben Han National Astronomical Observatories Chinese Academy of Sciences Beijing Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 《中国天文和天体物理学报》2006,(6)
We use wavelet transform to study the time series of the Earth's rotation rate (length-of-day, LOD), the axial components of atmospheric angular momentum (AAM) and oceanic angular momentum (OAM) in the period 1962-2005, and discuss the quasi-biennial oscillations (QBO) of LOD change. The results show that the QBO of LOD change varies remarkably in amplitude and phase. It was weak before 1978, then became much stronger and reached maximum values during the strong El Nino events in around 1983 and 1997. Results from analyzing the axial AAM indicate that the QBO signals in axial AAM are extremely consistent with the QBOs of LOD change. During 1963-2003, the QBO variance in the axial AAM can explain about 99.0% of that of the LOD, in other words, all QBO signals of LOD change are almost excited by the axial AAM, while the weak QBO signals of the axial OAM are quite different from those of the LOD and the axial AAM in both time-dependent characteristics and magnitudes. The combined effects of the axial AAM and OAM can explain about 99.1% of the variance of QBO in LOD change during this period. 相似文献
149.
D.M.D.Jasinta Bosscha Observatory Lembang Bandung Indonesia Department of Astronomy Institut Teknologi Bandung Jl. Ganesha Bandung Indonesia jasinta @ sirius. as. itb. ac.id 《天文研究与技术》1999,(Z1)
1 IntroductionSirius (α2 0 0 0 =6 h45 m2 ,δ2 0 0 0 =- 1 6°41′) ,thebrighteststarinthesky ,isadoublestarsystemwithlargemagnitudedifferencebetweenthetwocomponents (V =- 1 5 8forthebrighterstarand 8 44forthesecondary) .Thisyieldsvisualobservationstobemadeonlywhentheseparationsarela… 相似文献
150.
丽江高美古的天文观测条件 总被引:6,自引:0,他引:6
综述对丽江高美古的视宁度、天光亮度、消光系数进行观测的原理、仪器、观测方法和结果.结果表明,高美古是我国南方的优良光学天文台址,视宁度达到世界优良台址的水平 相似文献