全文获取类型
收费全文 | 230篇 |
免费 | 3篇 |
国内免费 | 4篇 |
专业分类
大气科学 | 30篇 |
地球物理 | 48篇 |
地质学 | 78篇 |
海洋学 | 35篇 |
天文学 | 35篇 |
综合类 | 1篇 |
自然地理 | 10篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 5篇 |
2017年 | 2篇 |
2016年 | 4篇 |
2015年 | 5篇 |
2014年 | 8篇 |
2013年 | 12篇 |
2012年 | 12篇 |
2011年 | 14篇 |
2010年 | 10篇 |
2009年 | 24篇 |
2008年 | 10篇 |
2007年 | 17篇 |
2006年 | 6篇 |
2005年 | 11篇 |
2004年 | 15篇 |
2003年 | 4篇 |
2002年 | 8篇 |
2001年 | 7篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1979年 | 3篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1971年 | 1篇 |
1961年 | 1篇 |
1953年 | 1篇 |
1949年 | 1篇 |
排序方式: 共有237条查询结果,搜索用时 31 毫秒
51.
T. Vinci M. Kœnig A. Benuzzi-Mounaix L. Boireau S. Bouquet S. Leygnac C. Michaut C. Stehlé O. Peyrusse D. Batani 《Astrophysics and Space Science》2005,298(1-2):333-336
This paper presents some recent measurements on radiative shocks generated in a xenon gas cell using high power laser. We
show new results on temperature and electronic density, and on radial expansion of the shock at various initial conditions
(laser energy and gas pressure). The data obtained are compared with one-dimensional and two-dimensional hydro simulations. 相似文献
52.
X. Ribeyre L. Hallo V. T. Tikhonchuk S. Bouquet J. Sanz 《Astrophysics and Space Science》2007,307(1-3):169-172
The Rayleigh-Taylor instability (RTI) plays an important role in the dynamics of several astronomical objects, in particular,
in the supernovae (SN) evolution. In the present paper we examine the dynamics of a shell (representing a type II SN remnant)
blown-up by a wind emitted by a central pulsar. The shell is accelerated by the pulsar wind and its inner surface experiences
the RTI. We develop an analytical approach by using a specific transformation into the coordinate frame co-moving with the
SN ejecta. We first derive a non-stationary spherically symmetric solution describing an expansion of a gas shell under the
pressure of a central source (pulsar). Then, we analyze its 3D stability with respect to a small perturbation on the inner
shell surface. The dispersion relation is derived in the co-moving reference frame. The growth rate of the perturbation is
found and its temporal evolution is discussed. We compare our result with the previous published studies and apply it to the
Crab nebula evolution. 相似文献
53.
Bouras Fawzi Al-Mukhtar Muzahim Tapsoba Nouffou Belayachi Naima Sabio Serge Beck Kévin Martin Mylène 《Geotechnical and Geological Engineering》2022,40(4):2033-2049
Geotechnical and Geological Engineering - An investigation performed on the interactions of silty soil treated with cement or lime demonstrates the strong relationship between microstructural... 相似文献
54.
Serge V. NAUGOLNYKH 《《地质学报》英文版》2022,96(3):1098-1112
The lithological and geochemical composition and conditions of formation of the coal-bearing deposits of the Kizel Coal Basin in the Perm region of the Urals (central Russia) are described using the two most representative sections, Gubakha–Stary Most and Krestovaya Mountain, based on a detailed “layer-by-layer” technique. Brief characteristics of the Lower Carboniferous paleosols from fossil paleosol (FPS-) profiles of the studied region are given. Special attention is paid to the parent vegetation of the coal-forming processes, based on an analysis of both plant macrofossils and palynoflora. The peat accumulation in conditions of permanent incoming of clastic material from the Paleo-Urals to the Kizel Basin was probably effective only in more or less stable environments, when the accumulated organic matter produced by plant mortmass was not dissolved by clastic particles. Thus, the conditions of coal-forming are reconstructed as a forest swamp, where the main dominants are represented by lycopodiopsids of the order Lepidodendrales, predominantly Lepidodendron veltheimii. These plants in particular were the source of the initial organic matter for the peat (and later coal) of the Kizel Coal Basin. 相似文献
55.
56.
E. Falize C. Michaut C. Cavet S. Bouquet M. Koenig B. Loupias A. Ravasio C. G. Gregory 《Astrophysics and Space Science》2009,322(1-4):71-75
In this paper we study specific classes of radiating shocks which are widely spread in astrophysical environments. We present new analytical solutions available for any exponents of typical power-law cooling function which generalize the five special cases (corresponding to specific values of these exponents) of radiating shocks structure and proceed to the analytical determination of physical quantities. Then an application of the results for the accretion shock in polar is realized. A discussion of the reproducibility of cooling layer in laboratory is proposed using scaling laws. 相似文献
57.
Spatial Variation of Sea-Spray Fluxes over a Mediterranean Coastal Zone Using a Sea-State Model 总被引:1,自引:1,他引:0
Jacques Piazzola Philippe Forget Christine Lafon Serge Despiau 《Boundary-Layer Meteorology》2009,132(1):167-183
We first deal with sea-spray flux estimates for short fetch conditions in coastal Mediterranean areas. To this end, a sea-state
dependent model for the whitecap fraction was included in three different formulations for the sea-spray source function.
A comparison with the sea-spray fluxes, calculated on the basis of aerosol size distributions measured at the island of Porquerolles
located south off the French Riviera, evaluates the predictions of different whitecap dependant flux formulations. Then we
deal with the spatial distribution of the whitecap fraction and the sea-spray fluxes in the study area. To achieve this, a
whitecap dependant flux formulation was forced by a wave numerical model that was implemented in the study area. Experimental
results on wave conditions have been used to adjust the model in the Mediterranean coastal area. Numerical simulations of
wave and whitecap coverage have been carried out during typical regional wind events, and they show a nonhomogeneous distribution
of the sea-surface production over the northern Mediterranean as a consequence of the spatial variation of the sea state.
In particular, we note the occurrence of a narrow band of high sea-surface production following the northern coast and along
the east part of the Gulf of Lions. 相似文献
58.
Pascal Goderniaux Serge Brouyère Alexis Gutierrez Nicole Baran 《Hydrogeology Journal》2010,18(7):1729-1740
For good management of groundwater resources, and to comply with European and national regulations, a detailed understanding of an aquifer’s hydraulic setting is required. In order to better characterize a sandy aquifer that is affected by diffuse pollution (Brévilles spring catchment, Val d’Oise, France), and to quantify the transfer time in the saturated zone, a multi-tracer test involving a new technique, the ‘finite volume point dilution method’, has been performed in natural flow conditions. In November 2005, injections of four different tracers took place in four piezometers involving different locations and depths in the aquifer. Recovery of the tracers was observed at two different places near the aquifer outlet. A particularly long and unusual monitoring exercise (27 months) demonstrated the existence of several different velocities within the sandy layer, which seems to be linked to the decrease of hydraulic conductivity with depth. The new insight and parameter quantification brought by interpretation of these tests contribute to a better characterization of the saturated zone. The particularly long-term monitoring exercise also gives new information to understand and forecast the trend and persistence of groundwater contamination by pesticides in the catchment. 相似文献
59.
B. Loupias E. Falize M. Koenig S. Bouquet N. Ozaki A. Benuzzi-Mounaix C. Michaut M. Rabec le Goahec W. Nazarov C. Courtois Y. Aglitskiy A. YA. Faenov T. Pikuz 《Astrophysics and Space Science》2007,307(1-3):103-107
We present experiments performed with the LULI2000 nanosecond laser facility. We generated plasma jets by using specific designed
target. The main measured quantities related to the jet such as its propagation velocity, temperature and emissive radius
evolution are presented. We also performed analytical work, which explains the jet evolution in some cases. 相似文献
60.
Antonio Pusceddu Silvia Bianchelli Miquel Canals Anna Sanchez-Vidal Xavier Durrieu De Madron Serge Heussner Vasilios Lykousis Henko de Stigter Fabio Trincardi Roberto Danovaro 《Deep Sea Research Part I: Oceanographic Research Papers》2010,57(3):441-457
We describe the quantitative and compositional (phytopigment, protein, carbohydrate and lipid) patterns of sedimentary organic matter along bathymetric gradients in seven submarine canyons and adjacent open slopes located at four European regions: one along the NE Atlantic and three along the Mediterranean continental margins. The investigated areas are distributed along a putative longitudinal gradient of decreasing primary production from the Portuguese (northeastern Atlantic Ocean), to the Catalan (western Mediterranean Sea), Southern Adriatic (central Mediterranean Sea) and Southern Cretan (eastern Mediterranean Sea) margins. Sediment concentrations of organic matter differed significantly between the Portuguese margin and the Mediterranean regions and also from one study area to the other within the Mediterranean Sea. Differences in quantity and composition of sediment organic matter between canyons and open slopes were limited and significant only in the eutrophic Portuguese margin, where the differences were as large as those observed between regions (i.e. at the mesoscale). These results suggest that the overall trophic status of deep margin sediments is controlled mostly by the primary productivity of the overlying waters rather than by the local topography. Moreover, we also report that the quantity and nutritional quality of sediment organic matter in canyons and adjacent open slopes do not show any consistent depth-related pattern. Only the Nazaré and Cascais canyons in the Portuguese margin, at depths deeper than 500 m, displayed a significant accumulation of labile organic matter. The results of our study underline the need of further investigations of deep margins through sampling strategies accounting for adequate temporal and spatial scales of variability. 相似文献