全文获取类型
收费全文 | 1079篇 |
免费 | 42篇 |
国内免费 | 5篇 |
专业分类
测绘学 | 47篇 |
大气科学 | 76篇 |
地球物理 | 214篇 |
地质学 | 376篇 |
海洋学 | 85篇 |
天文学 | 185篇 |
综合类 | 7篇 |
自然地理 | 136篇 |
出版年
2024年 | 7篇 |
2021年 | 10篇 |
2020年 | 10篇 |
2019年 | 14篇 |
2018年 | 10篇 |
2017年 | 23篇 |
2016年 | 26篇 |
2015年 | 10篇 |
2014年 | 33篇 |
2013年 | 37篇 |
2012年 | 32篇 |
2011年 | 34篇 |
2010年 | 46篇 |
2009年 | 43篇 |
2008年 | 55篇 |
2007年 | 58篇 |
2006年 | 49篇 |
2005年 | 44篇 |
2004年 | 41篇 |
2003年 | 48篇 |
2002年 | 46篇 |
2001年 | 19篇 |
2000年 | 27篇 |
1999年 | 31篇 |
1998年 | 29篇 |
1997年 | 15篇 |
1996年 | 23篇 |
1995年 | 13篇 |
1994年 | 13篇 |
1993年 | 11篇 |
1992年 | 17篇 |
1991年 | 5篇 |
1990年 | 11篇 |
1989年 | 15篇 |
1988年 | 9篇 |
1987年 | 8篇 |
1986年 | 11篇 |
1985年 | 14篇 |
1984年 | 20篇 |
1983年 | 14篇 |
1982年 | 18篇 |
1981年 | 10篇 |
1980年 | 8篇 |
1979年 | 19篇 |
1978年 | 11篇 |
1977年 | 18篇 |
1976年 | 9篇 |
1975年 | 12篇 |
1974年 | 9篇 |
1973年 | 7篇 |
排序方式: 共有1126条查询结果,搜索用时 15 毫秒
21.
22.
本文报导了应用纤维素乙酸平板电泳方法,测定采于中国山东省东方红盐场卤虫(Artemia)的同功酶。经测定,8种同功酶其中有6种是多态的,即:苹果酸脱氢酶(MDH)、异柠檬酸酶(IDH)、谷氨酸草醋酸转移酶(GOT)、葡糖-6-磷酸盐脱氢酶(D6PHD)、6-磷酸萄糖脱氢酶(6PGDH)和磷酸葡糖异构酶(PGI)。本文所提供的研究方法,不仅适用于基础研究,而且在水产养殖业上有助于对卤虫的筛选和确证。 相似文献
23.
Elizabeth B. Kujawinski Rossana Del Vecchio Neil V. Blough Geoffrey C. Klein Alan G. Marshall 《Marine Chemistry》2004,92(1-4):23
Molecular-level characterization of natural organic matter (NOM) has been elusive due to the inherent complexity of natural organic mixtures and to the fact that individual components are often polar and macromolecular. Electrospray ionization (ESI) is a “soft” ionization technique that ionizes polar compounds from aqueous solution prior to injection into a mass spectrometer. The highest resolution and mass accuracy of compounds within NOM have been achieved when ESI is combined with an ultrahigh-resolution mass spectrometer such as the Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS). With this technique, individual molecules within a variety of natural organic mixtures can be detected and their elemental composition can be determined. At low mass-to-charge (m/z) ratio, the resolution is high enough to assign exact molecular formulas allowing specific components of these mixtures to be identified. In addition to molecular identification, we can now use ESI FT-ICR MS to examine molecular-level changes in different organic mixtures as a function of relevant geo-processes, such as microbial alterations and photochemistry. Here we present the results from the application of ESI FT-ICR MS to two geochemical questions: (1) the effect of photoirradiation on the molecular composition of fulvic acids and (2) the role of protozoan grazers in the modification of DOM in aquatic systems. 相似文献
24.
The Magellan seamounts began forming as large submarine shield volcanoes south of the equator during the Cretaceous. These
volcanoes formed as a cluster on the small Pacific plate in a period when tectonic stress was absent. Thermal subsidence of
the seafloor led to sinking of these volcanoes and the formation of guyots as the seamounts crossed the equatorial South Pacific
(10–0°S) sequentially and ocean surface temperatures became too high for calcareous organisms to survive. Guyot formation
was completed between about 59 and 45 Ma and the guyots became phosphatized at about 39–34 and 27–21 Ma. Ferromanganese crusts
began formation as proto-crusts on the seamounts and guyots of the Magellan Seamount cluster towards the end of the Cretaceous
up to 55 Ma after the formation of the seamounts themselves. The chemical composition of these crusts evolved over time in
a series of steps in response to changes in global climate and ocean circulation. The great thickness of these crusts (up
to 15–20 cm) reflects their very long period of growth. The high Co contents of the outer parts of the crusts are a consequence
of the increasing deep circulation of the ocean and the resulting deepening of the oxygen minimum zone with time. Growth of
the Co-rich Mn crusts in the Magellan Seamount cluster can be considered to be the culmination of a long journey through time. 相似文献
25.
Trends in emigration from Ireland over time are reviewed. "During the eighteenth and nineteenth centuries overseas migration to the United States and seasonal harvest migration to Britain were the main types of movement, but over the past 100 years the Irish have developed a special affinity for settling in British towns. Although the outflow was halted for a time during the 1970s, when return migration took over, the 1980s have seen a renewal of the exodus. This time, however, the character of the flow has changed from predominantly low-skill construction and factory workers to embrace better-educated emigrants, including many graduates. This shift reflects Ireland's changing position in the international market for labour." 相似文献
26.
Interactive 3-D computation of fault surfaces using level sets 总被引:1,自引:0,他引:1
Benjamin J. Kadlec Geoffrey A. Dorn Henry M. Tufo David A. Yuen 《Visual Geosciences》2008,13(1):133-138
Deformable implicit surfaces, implemented with level set methods, have demonstrated a great potential in the computational
sciences for applications such as modeling, simulation, and segmentation. They allow implicit handling of complex topologies
deformed by operations where large changes can occur without destroying the level set representation. The use of level set
techniques for the computation and segmentation of plane-like and high positive curvature features is nontrivial. We present
a technique for representing and extracting fault surfaces from 3-D seismic attribute data such that 2-manifolds can be interactively
computed and segmented. We present our approach as an interactive workflow that generates highly accurate fault surfaces. 相似文献
27.
28.
The advent of the Virtual Observatory has begun an evolution in the space physics data environment. A number of nascent and
discipline specific Virtual Observatories have started to emerge with an emphasis on data search and retrieval. As this new
data environment takes shape an emphasis will be placed on interdisciplinary communication in attempts to address large scale
and global problems. To this end we formulate the development of a query language to facilitate Virtual Observatory to Virtual
Observatory communication. Furthermore, we outline the goals of such a language, how it would work and how existing community
efforts can be leveraged to speed the development of this query language.
相似文献
T.W. NarockEmail: |
29.
"This paper offers a review and evaluation of the Greek experience of international migration.... The analysis is based partly on available published data, and partly on qualitative appraisals. Three major international migration phases are analysed--emigration, return migration and immigration--and the main socio-economic and cultural effects of these migration trends are discussed. The paper pays particular attention to the recent mass immigration movements, noting their heterogeneity...and describing their impact on the Greek labour market. The article concludes with some comments on the difficulties of formulating a Greek migration policy in the light of the country's location, open borders and internationalized economy." 相似文献
30.