全文获取类型
收费全文 | 685篇 |
免费 | 47篇 |
国内免费 | 4篇 |
专业分类
测绘学 | 19篇 |
大气科学 | 61篇 |
地球物理 | 253篇 |
地质学 | 239篇 |
海洋学 | 21篇 |
天文学 | 87篇 |
综合类 | 11篇 |
自然地理 | 45篇 |
出版年
2024年 | 3篇 |
2023年 | 4篇 |
2022年 | 7篇 |
2021年 | 11篇 |
2020年 | 12篇 |
2019年 | 14篇 |
2018年 | 52篇 |
2017年 | 48篇 |
2016年 | 68篇 |
2015年 | 49篇 |
2014年 | 56篇 |
2013年 | 56篇 |
2012年 | 34篇 |
2011年 | 30篇 |
2010年 | 35篇 |
2009年 | 27篇 |
2008年 | 28篇 |
2007年 | 26篇 |
2006年 | 25篇 |
2005年 | 13篇 |
2004年 | 7篇 |
2003年 | 10篇 |
2002年 | 12篇 |
2001年 | 8篇 |
2000年 | 11篇 |
1999年 | 7篇 |
1998年 | 9篇 |
1997年 | 3篇 |
1996年 | 9篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 7篇 |
1991年 | 6篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1976年 | 2篇 |
1974年 | 1篇 |
1973年 | 3篇 |
1971年 | 2篇 |
1970年 | 1篇 |
1969年 | 2篇 |
排序方式: 共有736条查询结果,搜索用时 5 毫秒
61.
M. Jamrozy D. Kozieł-Wierzbowska S. Zoła A. Kuźmicz J. Machalski 《Journal of Astrophysics and Astronomy》2011,32(4):467-470
J1159+5820 is an extended radio galaxy with a quite unusual morphology, featuring two pairs of radio lobes. Such sources,
called double–double radio galaxies, constitute a very rare class of extragalactic radio sources. Furthermore, the extended
radio structure of this source shows an X-shape form. According to a much likely scenario, such a morphology is due to interrupting
nuclear activity in its central active galactic nucleus. Interestingly, the host of this source is a near-distance bright
galaxy named CGCG 292-057, which is clearly disturbed, with tidal features and shells as plausible signs of a recent merger. 相似文献
62.
Kuster-Toksöz and Biot-Gassmann models for estimating velocities of longitudinal and shear waves on the basis of well-logging data were analysed. P-wave and S-wave velocity models are crucial for interpretation of seismic data. Discussed models enable determination with quite good accuracy, in some cases higher than the acoustic full wavetrains interpretation. Because velocity strongly depends on lithology and saturation of pore space, the selection of parameters of rock matrix, hydrocarbons and formation waters has a strong effect on the quality of velocities estimation. 相似文献
63.
64.
Aschwanden Markus J. De Pontieu Bart Schrijver Carolus J. Title Alan M. 《Solar physics》2002,206(1):99-132
Solar Physics - We measure geometric and physical parameters oftransverse oscillations in 26 coronal loops, out of the 17 events described in Paper I by Schrijver, Aschwanden, and Title (2002).... 相似文献
65.
66.
Ken Kobayashi Jonathan Cirtain Amy R. Winebarger Kelly Korreck Leon Golub Robert W. Walsh Bart De Pontieu Craig DeForest Alan Title Sergey Kuzin Sabrina Savage Dyana Beabout Brent Beabout William Podgorski David Caldwell Kenneth McCracken Mark Ordway Henry Bergner Richard Gates Sean McKillop Peter Cheimets Simon Platt Nick Mitchell David Windt 《Solar physics》2014,289(11):4393-4412
The High-Resolution Coronal Imager (Hi-C) was flown on a NASA sounding rocket on 11 July 2012. The goal of the Hi-C mission was to obtain high-resolution (≈?0.3?–?0.4′′), high-cadence (≈?5 seconds) images of a solar active region to investigate the dynamics of solar coronal structures at small spatial scales. The instrument consists of a normal-incidence telescope with the optics coated with multilayers to reflect a narrow wavelength range around 19.3 nm (including the Fe xii 19.5-nm spectral line) and a 4096×4096 camera with a plate scale of 0.1′′?pixel?1. The target of the Hi-C rocket flight was Active Region 11520. Hi-C obtained 37 full-frame images and 86 partial-frame images during the rocket flight. Analysis of the Hi-C data indicates the corona is structured on scales smaller than currently resolved by existing satellite missions. 相似文献
67.
Sławomir Breiter 《Celestial Mechanics and Dynamical Astronomy》1997,67(3):237-249
The analytical solution for the perturbations of an artificial satellite due to the zonal part of the geopotential is presented.
The Hamiltonian is fully normalized up to the second order by a single averaging transformation and the generating function
is given explicitly. The formulas allow an arbitrarily high degree of geopotential harmonics to be included. The transformation
from mean to osculating variables or vice versa is performed by means of a numerical method proposed by the author in a previous
paper (Breiter,1997): periodic perturbations are computed by means of a Runge-Kutta method of order 2 instead of being explicitly
derived from a generator.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
68.
Michał Siwak 《Astrophysics and Space Science》2005,296(1-4):289-292
In this paper we investigate a sample of contact eclipsing binary systems, which exhibit a large temperature difference (at
least 1000 K) between the components. Considering the effective temperature of the primary star, the systems were divided
into three groups. We applied a Monte Carlo method as a more suitable procedure for the search of the system configurations
previously known as contact binaries with a large temperature difference and with a negligible value of the filling factor.
Using only data presented in the literature, we found that the geometrical configuration of almost all systems from the second
group is near-contact rather than contact. 相似文献
69.
We discuss Arp's hypothesis that the HII regions are more numerous and more conspicuous on the side of a galaxy facing its companion. Arp's hypothesis seems not to be true if we add to Hodge's sets of galaxies only the most probably tidally-interacting cases. 相似文献
70.
Sokołowski A Wołowicz M Hummel H Smolarz-Górska K Fichet D Radenac G Thiriot-Quiévreux C Namieśnik J 《Marine pollution bulletin》2004,49(1-2):17-22
Recent studies of the Baltic clam Macoma balthica (L.) from the southern Baltic (the Gulf of Gdansk) have revealed striking morphological, histological and cytogenetic features. Strong deformation of the shell, including elongation of the posterior end and the appearance of an easily visible flexure in this part, has been recorded. The population contribution of the deformed blunt shelled ("irregular") clams ranged from 0% to 65% and tended to increase with depth. The morphologically "irregular" clams had higher accumulated tissue concentrations of trace metals (As, Ag, Cd, Pb, Cu and Zn), indicating a different metal handling ability. Adverse conditions in deeper water regions of the Gulf (e.g. hypoxia, hydrogen sulphide, elevated bioavailability of contaminants) have been suggested as inducers of the phenotypical changes (morphological deformation) in part of the population and, in parallel, of the specific physiological adaptations that result in higher metal accumulation in the "irregular" clams. Cytogenetic and histological analyses showed the presence of tumours in gill cells and digestive system of the affected clams, the prevalence of disseminated neoplasia ranging from 0% to 94% depending on the site. The disease was manifested by a modified karyotype (i.e. an abnormal number and morphology of chromosomes), a higher activity of nucleolar organizer regions (AgNORs), and tissue lesions (enlarged cells, actively proliferative with pleomorphic nuclei). Bottom sediments showed acute toxicity and have been proposed as a source of an initialising carcinogenic factor. However, none of the ecotoxicological studies provided was successful in the clear demonstration of a single (or multifactorial) agent that can account for the disseminated neoplasia. 相似文献