全文获取类型
收费全文 | 236篇 |
免费 | 10篇 |
国内免费 | 1篇 |
专业分类
测绘学 | 3篇 |
大气科学 | 17篇 |
地球物理 | 81篇 |
地质学 | 84篇 |
海洋学 | 20篇 |
天文学 | 26篇 |
自然地理 | 16篇 |
出版年
2020年 | 10篇 |
2019年 | 3篇 |
2018年 | 9篇 |
2017年 | 10篇 |
2016年 | 13篇 |
2015年 | 10篇 |
2014年 | 9篇 |
2013年 | 4篇 |
2012年 | 13篇 |
2011年 | 9篇 |
2010年 | 13篇 |
2009年 | 12篇 |
2008年 | 12篇 |
2007年 | 14篇 |
2006年 | 5篇 |
2005年 | 11篇 |
2004年 | 3篇 |
2003年 | 7篇 |
2002年 | 13篇 |
2001年 | 4篇 |
2000年 | 8篇 |
1999年 | 4篇 |
1998年 | 7篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1984年 | 1篇 |
1981年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有247条查询结果,搜索用时 146 毫秒
131.
Rodolfo Carosi Chiara Montomoli Nicola Bertuccelli Maurizio Profeti 《Comptes Rendus Geoscience》2002,334(5):339-346
Structural analysis performed in the southern sector of the Apuan Alps Metamorphic Complex (AAMC) and on the overlaying Tuscan Nappe (TN) pointed out a structural evolution much more complex than that outlined till now. The comparison between the structural evolutions of the two tectonic units could provide new important constraints on the tectonic evolution of the whole belt. The two tectonic units recorded different tectonic evolution during the first stages of compression, while they shared the same deformation history later after the Tuscan Nappe overlapped the AAMC. The coupled tectonic units have been then deformed by two systems of folds, in a compressive tectonic regime. Extensional tectonics affected the units later, at upper crustal levels. To cite this article: R. Carosi et al., C. R. Geoscience 334 (2002) 339–346. 相似文献
132.
133.
134.
135.
Zeolitization of Oligo-Miocene volcaniclastic rocks from Logudoro (northern Sardinia, Italy) 总被引:1,自引:0,他引:1
Guido Cerri Piergiulio Cappelletti Alessio Langella Maurizio de'Gennaro 《Contributions to Mineralogy and Petrology》2001,140(4):404-421
The present study reports the results of research on volcaniclastic products from Logudoro (northern Sardinia), a reconstructed
stratigraphic succession some hundreds of meters thick, comprising two different ignimbritic units separated by an epiclastic
layer (generally ˜10 m thick). Clinoptilolite is the most widely distributed authigenic phase in epiclastite and unwelded
units, always associated with opal-CT and sometimes with smectite. An adularia-like feldspar, cristobalite and epigenetic
quartz are typical phases of welded units. Within the zeolitized units (unwelded ignimbrite and epiclastic units) clinoptilolite
and opal-CT constitute the cement deriving from the transformation of the precursor rhyolitic glass, in agreement with a single
zeolitization process that developed after the deposition of the entire succession. Silica increases in zeolitized rocks with
respect to the precursor material, leading to hypothesize that the secondary mineralization process was favored by mineralized
hydrothermal fluids preferentially circulating through the fault system of the area. Quartz veins in welded subunit and K-feldspar
(adularia-like) preferentially located near the faults are in agreement with this hypothesis. The interaction of these fluids
with the glassy fraction favored its dissolution and the consequent crystallization of clinoptilolite. Furthermore, the pH
increase and the silica supersaturation enhanced the contemporary or subsequent precipitation of opal-CT.
Received: 5 June 2000 / Accepted: 14 August 2000 相似文献
136.
137.
138.
139.
Maurizio De Rosa Gianluca Gagliardi Alessandra Rocco Renato Somma Paolo De Natale Giuseppe De Natale 《Geochemical transactions》2007,8(1):5
We report on a continuous-measurement campaign carried out in Vulcano (Aeolian islands, Sicily), devoted to the simultaneous
monitoring of CO2 and H2O concentrations. The measurements were performed with an absorption spectrometer based on a semiconductor laser source emitting
around a 2-μm wavelength. The emitted radiation was selectively absorbed by two molecular ro-vibrational transitions specific of the investigated
species. Data for CO2 and H2O concentrations, and CO2 soil diffusive flux using an accumulation chamber configuration, were collected at several interesting sampling points on
the island (Porto Levante beach- PLB, Fossa Grande Crater – FOG- and Valley of Palizzi, PAL). CO2/H2O values, measured on the ground, are very similar (around 0.019 (± 0.006)) and comparable to the previous discrete detected
values of 0.213 (Fumarole F5-La Fossa crater rim) and 0.012 (Fumarole VFS – Baia Levante beach) obtaid during the 1977–1993
heating phase of the crater fumaroles. 相似文献
140.
David Frank Ulf Büntgen Reinhard Bhm Maurizio Maugeri Jan Esper 《Quaternary Science Reviews》2007,26(25-28):3298-3310
Comparison of tree-ring-based warm-season temperature reconstructions and their instrumental target data reveals substantial divergence between (warmer) early instrumental measurements and (colder) proxy estimates. Here we detail this systematic misfit for the Northern Hemisphere before 1900 and the European Alps before 1850. Five hypotheses related to both proxy and target uncertainties are presented towards explaining this phenomenon. These include: (1) tree-ring detrending methods, (2) biological persistence in the proxy time-series, (3) uncertainties and instabilities in the growth response to given climatic parameters, (4) reduced instrumental station availability back in time, and (5) instrumental data homogeneity. We suggest that uncertainties in the choice of instrumental targets at the hemispheric scale, and instrumental data inhomogeneities at the Alpine and possibly also the hemispheric-scale are the most important factors in explaining this offset. Assessment of homogeneity at larger scales remains challenging. Attention is drawn to possible warm biases in early thermometer shelters and the relevance of proxy/target discrepancies for understanding and quantifying the amplitude of both recent anthropogenic and past natural forced climate fluctuations. 相似文献