全文获取类型
收费全文 | 12574篇 |
免费 | 2268篇 |
国内免费 | 3173篇 |
专业分类
测绘学 | 1195篇 |
大气科学 | 2353篇 |
地球物理 | 2683篇 |
地质学 | 6261篇 |
海洋学 | 1983篇 |
天文学 | 700篇 |
综合类 | 1134篇 |
自然地理 | 1706篇 |
出版年
2024年 | 61篇 |
2023年 | 186篇 |
2022年 | 571篇 |
2021年 | 643篇 |
2020年 | 600篇 |
2019年 | 684篇 |
2018年 | 683篇 |
2017年 | 636篇 |
2016年 | 694篇 |
2015年 | 678篇 |
2014年 | 728篇 |
2013年 | 828篇 |
2012年 | 793篇 |
2011年 | 851篇 |
2010年 | 746篇 |
2009年 | 749篇 |
2008年 | 734篇 |
2007年 | 688篇 |
2006年 | 537篇 |
2005年 | 545篇 |
2004年 | 448篇 |
2003年 | 374篇 |
2002年 | 404篇 |
2001年 | 453篇 |
2000年 | 394篇 |
1999年 | 444篇 |
1998年 | 357篇 |
1997年 | 371篇 |
1996年 | 316篇 |
1995年 | 282篇 |
1994年 | 248篇 |
1993年 | 218篇 |
1992年 | 213篇 |
1991年 | 158篇 |
1990年 | 127篇 |
1989年 | 113篇 |
1988年 | 101篇 |
1987年 | 65篇 |
1986年 | 48篇 |
1985年 | 38篇 |
1984年 | 35篇 |
1983年 | 21篇 |
1982年 | 33篇 |
1981年 | 21篇 |
1980年 | 12篇 |
1979年 | 12篇 |
1978年 | 9篇 |
1977年 | 11篇 |
1976年 | 13篇 |
1958年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
21.
Hui-Rong Ji Qi-Jun Pu Yi-Hua Yan Yu-Ying Liu Zhi-Jun Chen Cheng-Ming Tan Cong-Ling Cheng De-Bang Lao Shu-Ke Li Zhi-Qiang Wang Min-Hong Yu Jian-Nong Liu Li-Kang Zhang Ji-Yong Gao National Astronomical Observatories Chinese Academy of Sciences Beijing Hebei Semiconductor Research Institute Shijiazhuang 《中国天文和天体物理学报》2005,5(4):433-441
An improved Solar Radio Spectrometer working at 1.10-2.06 GHz with much improved spectral and temporal resolution, has been accomplished by the National Astronomical Observatories and Hebei Semiconductor Research Institute, based on an old spectrometer at 1-2 GHz. The new spectrometer has a spectral resolution of 4 MHz and a temporal resolution of 5ms, with an instantaneous detectable range from 0.02 to 10 times of the quiet Sun flux. It can measure both left and right circular polarization with an accuracy of 10% in degree of polarization. Some results of preliminary observations that could not be recorded by the old spectrometer at 1-2 GHz are presented. 相似文献
22.
在建立斑节对虾实验室养殖模式的基础上,对野外采集的有白斑综合症病毒(WSSV)病典型症状的斑节对虾初步纯化其病毒,并进行WSSV的PCR检测,得到WSSV的感染用样品。对健康斑节对虾分别进行浸浴感染,投喂感染和注射感染。对感染死亡个体进行WSSA的PCR检测和细菌检测,证实WSSV感染性和致死性。浸浴感染、投喂感染和注射感染的感染量分别为4mL/L、0.2g/10g虾体、1/2稀释液0.05mL/10g虾体,死亡开始时间分别为16d、42h、28h,三种感染模式最终死亡率100%,从开始死亡到全部死亡延续时间分别为15d、82h、44h。 相似文献
23.
In many areas of engineering practice, applied loads are not uniformly distributed but often concentrated towards the centre of a foundation. Thus, loads are more realistically depicted as distributed as linearly varying or as parabola of revolution. Solutions for stresses in a transversely isotropic half‐space caused by concave and convex parabolic loads that act on a rectangle have not been derived. This work proposes analytical solutions for stresses in a transversely isotropic half‐space, induced by three‐dimensional, buried, linearly varying/uniform/parabolic rectangular loads. Load types include an upwardly and a downwardly linearly varying load, a uniform load, a concave and a convex parabolic load, all distributed over a rectangular area. These solutions are obtained by integrating the point load solutions in a Cartesian co‐ordinate system for a transversely isotropic half‐space. The buried depth, the dimensions of the loaded area, the type and degree of material anisotropy and the loading type for transversely isotropic half‐spaces influence the proposed solutions. An illustrative example is presented to elucidate the effect of the dimensions of the loaded area, the type and degree of rock anisotropy, and the type of loading on the vertical stress in the isotropic/transversely isotropic rocks subjected to a linearly varying/uniform/parabolic rectangular load. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
24.
以N_(263)浸渍在DA_(201)大孔吸附树脂上制得了N_(263)浸渍树脂,测定了静态时树脂Pb(Ⅱ)的吸附容量。通过柱层析法,试验了酸度,流速和干扰离子等因素对N_(263)浸渍树脂吸附和洗脱Pb的影响。建立了N_(263)浸渍树脂分离─富集后衔接原子吸收和比色法测定Pb(Ⅱ)的方法,测定了地质样品中Pb(Ⅱ),测试结果理想。 相似文献
25.
Lin Liu 《Chinese Astronomy and Astrophysics》1997,21(4):488-500
With the aim of analyzing the errors in the radial position of satellites, we give in this paper the expressions for the radial perturbation which include the complete zeroth- and first-order terms in the orbital eccentricity. A simpler and faster method of calculating the perturbation is given. 相似文献
26.
1882年李希霍芬在太原西山建立石炭系的太原系含煤建造以来,石炭系与二叠系的分界意见,归纳起来有三:①以Pseudoschwagerina(s.1)带之底为界,下面为石炭系,上面为二叠系;②以晋东南的灰白色“佳祥砂岩”与太原西山黄绿色“骆驼脖子砂岩”对比,砂岩底面为石炭系与二叠系的分界线,下面是石炭系山西组,上面是二叠系石盒子组,山西组的地层时代定为晚石炭世;③以晋东南灰白色第三砂岩(陵川砂岩)与太原西山“北岔沟砂岩”对比,砂岩底面为石炭系与二叠系的分界线,下面是石炭系太原组,上面是二叠系山西组,山西组的地层时代为早二叠世。笔者认为石炭系与二叠系的划分,以第③方案较适宜。 相似文献
27.
Numerical methods are usually used for the computation of ephemerides with perturbations for the precise orbital determination of an artificial satellite. But their numerical stability will be encountered in a long arc. In this case the use the improved Encke special perturbation methods has been suggested. The results of this paper show that Encke's method does indeed have a certain effectiveness, but cannot yet completely resolve the numerical stability, and the more efficient method is to use the energy integral or its variational relation to control the growth of the along-track error in general numerical calculations so that the aim of stabilization can be achieved. 相似文献
28.
29.
Hong Lin Zhang Douglas H. Sampson 《Monthly notices of the Royal Astronomical Society》2001,322(3):433-437
Calculations are made of the resonance contribution to electron-impact excitation of H-like 13 C and Li-like 23 Na, 25 Mg, 27 Al and 29 Si to the upper hyperfine levels that produce millimetre (mm) lines of likely astrophysical interest. The resonance contribution is found to be very important for these Li-like ions, considerably more important than for Li-like 57 Fe considered previously. However, resonances are found to be rather unimportant for H-like 13 C. The effect of radiative decay on the resonance contribution is found to be insignificant in all of the present calculations. 相似文献
30.
北天山东段康古尔塔格带是晚古生代塔里木板块和准噶尔板块碰撞的结果。它是一条复杂的、强烈的高应变带.并具有独特的变形机制、应变序列以及构造变形。本文运用构造-地层研究方法对该碰撞带的构造特征加以分析和研究。 相似文献