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81.
Saikia D. J. Shastri P. Cornwell T. J. Junor W. Muxlow T. W. B. 《Journal of Astrophysics and Astronomy》1989,10(2):203-235
As part of our study to understand the nature of extragalactic radio sources which are very asymmetric in the surface brightness
of the two lobes, often with radio emission on only one side of the nucleus, we have observed a large number of them with
high angular resolution and good surface brightness sensitivity at radio frequencies. In this paper we present VLA and MERLIN
observations of 15 such sources. We discuss their observed structures and spectra, and possible explanations for their morphologies.
We report evidence of a possible correlation between the hot-spot brightness ratio and the degree of core prominence, used
as a Statistical measure of source orientation, suggesting that relativistic beaming of the hot-spot emission does play a
significant role in the observed brightness asymmetry. To explain the apparently one-sided sources within the relativistic
beaming framework, the velocities required are in the range of 0.2 to 0.8c. We discuss the possibility that the lobe which is seen to the south of the jet in 3C273 is the counter-lobe seen in projection.
We also draw-attention to a number of one-sided sources with very weak cores, and discuss their possible nature. 相似文献
82.
83.
塔里木盆地喀什凹陷克拉托天然气来源分析及聚气特征 总被引:2,自引:1,他引:1
塔里木西南喀什凹陷的克拉托天然气主要表现为原油的溶解气或者湿气,甲烷含量为74.59%~85.58%,克4井和克30井天然气则为较干的湿气。克拉托天然气的δ13C1值为-41.2‰~-40.6‰,δ13C2值为-30.0‰~-27.4‰。气源对比表明克拉托天然气主要源自具有混源母质特征的中侏罗统湖相烃源岩,不同于源自石炭系烃源岩的阿克莫木天然气。喀什凹陷的中-下侏罗统烃源岩主要是由于新近系的巨厚沉积才从未成熟—低成熟阶段进入成熟—高成熟阶段,生成的油气在克拉托背斜圈闭中聚集,虽也属晚期成藏,却具有连续聚气的特征。上新世末期,喀什凹陷的周缘开始抬升,早期油气藏受到破坏,形成了现今的地表油气苗或油砂。 相似文献
84.
Yu. F. Yurovsky 《Bulletin of the Crimean Astrophysical Observatory》2007,103(1):30-38
The eclipse observations were performed at the Laboratory of Radio Astronomy of the CrAO in Katsiveli with stationary instrumentation of the Solar Patrol at wavelengths of 10.5 and 12.0 cm. The data obtained were used to determine the brightness temperature of the undisturbed Sun at solar activity minimum between 11-year cycles 23 and 24: T d10.5 = (43.7 ± 0.5) × 103 K at 10.5 cm and T d12.0 = (51.8 ± 0.5) × 103 K at 12.0 cm. The radio brightness distribution above the limb group of sunspots NOAA 0866 was calculated. It shows that at both wavelengths the source consisted of a compact bright nucleus about 50 × 103 km in size with temperatures T b10.5 = 0.94 × 106 K and T b12.0 = 2.15 × 106 K located, respectively, at heights h 10.5 = 33.5 × 103 km and h 12.0 = 43.3 × 103 km above the sunspot and an extended halo with a temperature T b = (230–300) × 103 K stretching to a height of 157 × 103 km above the photosphere. The revealed spatial structure of the local source is consistent with the universally accepted assumption that the radiation from the bright part of the source is generated by electrons in the sunspot magnetic fields at the second-third cyclotron frequency harmonics and that the halo is the bremsstrahlung of thermal electrons in the coronal condensation forming an active region. According to the eclipse results, the electron density near the upper boundary of the condensation was N e ≈ 2.3 × 108 cm?3, while the optical depth was τ ≈ 0.1 at an electron temperature T e ≈ 106 K. Thus, the observations of the March 29, 2006 eclipse have allowed the height of the coronal condensation at solar activity minimum to be experimentally determined and the physical parameters of the plasma near its upper boundary to be estimated. 相似文献
85.
F. Mantovani M. Nanni C. J. Salter P. Tomasi 《Journal of Astrophysics and Astronomy》1982,3(3):335-350
New observations of six fields from the low galactic latitude BG survey are presented. The radio sources within each of these
fields appear to be of a predominantly extragalactic nature. However, one object is in close positional proximity to the pulsar
1922 + 20 and the possibility of their association is considered. The extended source BGE 0323 + 65 is shown to be unlikely
to exist. 相似文献
86.
We have reinvestigated the reported tendency for the extended radio structures associated with bright elliptical galaxies
to be oriented preferentially along the optical minor axes. It is found that such a tendency exists only for those galaxies
in which the compact radio cores coincident with their nuclei are quite prominent. If the galaxies are divided into two groups
according to whether their cores account for less than or greater than 10 per cent of the total flux density at 2.7 GHz, the
angle Φ (between the radio axis and the optical minor axis) appears to be uniformly distributed between 0‡ and 90‡ for the
former, but is nearly always < 30‡ for the latter group. One possible explanation is that the radio emission from compact
cores suffers thermal absorption by ionized gas that is distributed differently in the two groups. 相似文献
87.
V. Krishan 《Journal of Astrophysics and Astronomy》1988,9(4):231-236
The occurrence of superluminal motion in extragalactic radio sources is believed to be quite common. Among others, the geometrical
scattering of radio radiation can also cause superluminal expansion and or motion and halo formation, In this paper, the effectiveness
of the stimulated Raman scattering in producing these features is investigated. The scattering medium is a plasma whose position,
density and temperature decide the rate and angle of scattering. When the radiation from a stationary and constant source
gets scattered from a stationary plasma, a halo is formed around the source. However, the scattering of a rotating radiation
beam does produce superluminal motion of the virtual source. It is found that the plasma should have the characteristics of
the emission-line regions and the intercloud medium in order to Raman scatter the radiation. Since the scattering is polarization
dependent, it is possible to estimate the rotation of the electric vector along the direction of the apparent motion of a
radio source. 相似文献
88.
降水中甲酸和乙酸研究综述 总被引:1,自引:0,他引:1
对大气降水中甲酸和乙酸的相关研究进行了综述。介绍了过去曾采用的研究降水样品中两种有机酸的处理和分析方法,以及目前最常用的实验室分析方法。对降水中两种有机酸的浓度范围、全球时空分布以及受影响因素等相关研究工作进行了系统归纳,并且结合理论计算说明了有机酸对降水酸度的影响是不可忽视的。介绍了历史研究工作中得出的降水中两种有机酸的来源,包括天然源、人为源和有机物的二次化学转化等,以及有机酸源研究对于开展其它降水有机酸工作的研究意义。 相似文献
89.
Polybrominated diphenyl ethers and polychlorinated biphenyls in sediments of southwest Taiwan: regional characteristics and potential sources 总被引:1,自引:0,他引:1
Very little information is available on the contamination of coastal sediments of Taiwan by PBDEs and PCBs. In this study, we determined the concentrations of 19 PBDE and 209 PCB congeners in 57 surface sediment samples to identify the possible sources of PBDEs and PCBs. The total PBDE and PCB concentrations ranged from below detection limit to 7.73 ng/g and 0.88-7.13 ng/g, respectively; these values are within the ranges observed for most coastal sediments worldwide. The PBDE congeners were dominated by BDE-209 (50.7-99.7%), with minor contributions from penta- and octa-BDEs. The signatures of PCB congeners suggested that PCB residues in Kaohsiung coast may be the legacy of past use or the result of ongoing inputs from the maintenance, repair and salvage of old ships. Principal component analysis of the congener-specific composition of PBDEs and PCBs revealed distinct regional patterns that are related to the use of commercial products. 相似文献
90.
R. A. Burenin A. V. Mescheryakov M. G. Revnivtsev S. Yu. Sazonov I. F. Bikmaev M. N. Pavlinsky R. A. Sunyaev 《Astronomy Letters》2008,34(6):367-374
We present the results of our optical identifications of a set of X-ray sources from the INTEGRAL and SWIFT all-sky surveys. The optical data have been obtained with the 1.5-m Russian-Turkish Telescope (RTT-150). Nine X-ray sources have been identified with active galactic nuclei (AGNs). Two of them are located in the nearby spiral galaxies MCG-01-05-047 and NGC 973 seen almost edge-on. One source, IGR J16562-3301, is probably a BL Lac object (blazar). The remaining AGNs are observed as the starlike nuclei of spiral galaxies whose spectra exhibit broad emission lines. The relation between the hard X-ray (17–60 keV) luminosity and the [O III] 5007 line luminosity, log L x/L [O III] ≈ 2.1, holds good for most of the AGNs detected in hard X rays. However, the luminosities of some AGNs deviate from this relation. The fraction of such objects can reach ~20%. In particular, the [O III] line flux is lower for two nearby edge-on spiral galaxies. This can be explained by the effect of absorption in the galactic disks. 相似文献