全文获取类型
收费全文 | 189篇 |
免费 | 12篇 |
国内免费 | 3篇 |
专业分类
测绘学 | 3篇 |
大气科学 | 38篇 |
地球物理 | 37篇 |
地质学 | 78篇 |
海洋学 | 32篇 |
天文学 | 4篇 |
综合类 | 2篇 |
自然地理 | 10篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 6篇 |
2020年 | 10篇 |
2019年 | 7篇 |
2018年 | 11篇 |
2017年 | 14篇 |
2016年 | 8篇 |
2015年 | 9篇 |
2014年 | 9篇 |
2013年 | 14篇 |
2012年 | 15篇 |
2011年 | 13篇 |
2010年 | 16篇 |
2009年 | 8篇 |
2008年 | 15篇 |
2007年 | 4篇 |
2006年 | 7篇 |
2005年 | 5篇 |
2004年 | 8篇 |
2003年 | 5篇 |
2002年 | 5篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1995年 | 3篇 |
1992年 | 1篇 |
1988年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有204条查询结果,搜索用时 15 毫秒
41.
Flow dynamics at the origin of thin clayey sand lacustrine turbidites: Examples from Lake Hazar,Turkey 下载免费PDF全文
Sophie Hage Aurélia Hubert‐Ferrari Laura Lamair Ulaş Avşar Meriam El Ouahabi Maarten Van Daele Frédéric Boulvain Mohamed Ali Bahri Alain Seret Alain Plenevaux 《Sedimentology》2017,64(7):1929-1956
Turbidity currents and their deposits can be investigated using several methods, i.e. direct monitoring, physical and numerical modelling, sediment cores and outcrops. The present study focused on thin clayey sand turbidites found in Lake Hazar (Turkey) occurring in eleven clusters of closely spaced thin beds. Depositional processes and sources for three of those eleven clusters are studied at three coring sites. Bathymetrical data and seismic reflection profiles are used to understand the specific geomorphology of each site. X‐ray, thin sections and CT scan imagery combined with grain‐size, geochemical and mineralogical measurements on the cores allow characterization of the turbidites. Turbidites included in each cluster were produced by remobilization of surficial slope sediment, a process identified in very few studies worldwide. Three types of turbidites are distinguished and compared with deposits obtained in flume studies published in the literature. Type 1 is made of an ungraded clayey silt layer issued from a cohesive flow. Type 2 is composed of a partially graded clayey sand layer overlain by a mud cap, attributed to a transitional flow. Type 3 corresponds to a graded clayey sand layer overlain by a mud cap issued from a turbulence‐dominated flow. While the published experimental studies show that turbulence is damped by cohesion for low clay content, type 3 deposits of this study show evidence for a turbulence‐dominated mechanism despite their high clay content. This divergence may in part relate to input variables, such as water chemistry and clay mineralogy, that are not routinely considered in experimental studies. Furthermore, the large sedimentological variety observed in the turbidites from one coring site to another is related to the evolution of a sediment flow within a field‐scale basin made of a complex physiography that cannot be tackled by flume experiments. 相似文献
42.
Matthew A.LAZZARA Sophie A.ORENDORF Taylor P.NORTON Jordan G.POWERS David H.BROMWICH Scott CARPENTIER John J.CASSANO Steven R.COLWELL Arthur M.CAYETTE Kirstin WERNER 《大气科学进展》2020,37(5):423-430
<正>1.Overview In July 2018, the Antarctic community came together to meet at the 13th Workshop on Antarctic Meteorology and Climate (WAMC) in Madison, Wisconsin, USA (Fig. 1); and in the following year in June 2019, the 14th WAMC was held in 相似文献
43.
44.
45.
46.
Delphine Yeghicheyan Dominique Aubert Martine Bouhnik‐Le Coz Jrme Chmeleff Sophie Delpoux Irina Djouraev Guy Granier Franois Lacan Jean‐Luc Piro Tristan Rousseau Christophe Cloquet Aurlie Marquet Christophe Menniti Catherine Pradoux Rmi Freydier Emmanoel Vieira da Silva‐Filho Krzysztof Suchorski 《Geostandards and Geoanalytical Research》2019,43(3):475-496
The natural river water reference material SLRS‐6 (NRC‐CNRC) is the newest batch of a quality control material routinely used in many international environmental laboratories. This work presents a nine‐laboratory compilation of measurements of major and trace element concentrations and their related uncertainties, unavailable in the NRC‐CNRC certificate (B, Cs, Li, Ga, Ge, Hf, Nb, P, Rb, Rh, Re, S, Sc, Se, Si, Sn, Th, Ti, Tl, W, Y, Y, Zr and REEs). Measurements were mostly made using inductively coupled plasma‐mass spectrometry. The results are compared with equivalent data for the last batch of the material, SLRS‐5, measured simultaneously with SLRS‐6 in this study. In general, very low concentrations, close to the quantification limits, were found in the new batch. The Sr isotopic ratio is also reported. 相似文献
47.
48.
49.
Raw data on tornadoes and other destructive windstorms in the provincesof Alberta and Saskatchewan, Canada, are analyzed for spatial variations and timetrends. All storms and a subclass of intense storms are analyzed separately. StatisticsCanada agriculture census data are used to correct storm frequencies for the absenceof reports from unoccupied land, for sampling network drift, and for changes in farmnumbers and sizes. These corrections eliminate an apparent tornado spatial frequencymaximum in central Alberta and reveal a minor temporal frequency maximum from1906 to 1940 followed by no apparent trend in time for all intense storms. The frequencies of reports of severe winters in rural community histories of Alberta and Saskatchewan are compared with mean winter temperatures at Edmonton and with a severe winter index derived from temperature and snowfall data. All temperature data were corrected for urban heat island warming by an adaptation of Oke's proposed logarithmic relation between heat island intensity and urban population. The index identifies in correct order of importance the three most frequently mentioned severe winters of 1907, 1920 and 1936. Ten-year averages of mean winter temperatures and the severe winter index from 1882 to 2001 seem to show wavelike time changes rather than a long-term trend. 相似文献
50.
Barriers perceived to engaging with climate change among the UK public and their policy implications 总被引:6,自引:2,他引:6
Irene Lorenzoni Sophie Nicholson-Cole Lorraine Whitmarsh 《Global Environmental Change》2007,17(3-4):445-459
This paper reports on the barriers that members of the UK public perceive to engaging with climate change. It draws upon three mixed-method studies, with an emphasis on the qualitative data which offer an in-depth insight into how people make sense of climate change. The paper defines engagement as an individual's state, comprising three elements: cognitive, affective and behavioural. A number of common barriers emerge from the three studies, which operate broadly at ‘individual’ and ‘social’ levels. These major constraints to individual engagement with climate change have implications for achieving significant reductions in greenhouse gases in the UK. We argue that targeted and tailored information provision should be supported by wider structural change to enable citizens and communities to reduce their carbon dependency. Policy implications for effective engagement are discussed. 相似文献