全文获取类型
收费全文 | 87294篇 |
免费 | 1378篇 |
国内免费 | 540篇 |
专业分类
测绘学 | 1833篇 |
大气科学 | 5805篇 |
地球物理 | 16676篇 |
地质学 | 31824篇 |
海洋学 | 7947篇 |
天文学 | 20097篇 |
综合类 | 243篇 |
自然地理 | 4787篇 |
出版年
2022年 | 619篇 |
2021年 | 1048篇 |
2020年 | 1115篇 |
2019年 | 1247篇 |
2018年 | 2732篇 |
2017年 | 2547篇 |
2016年 | 2804篇 |
2015年 | 1404篇 |
2014年 | 2679篇 |
2013年 | 4502篇 |
2012年 | 2957篇 |
2011年 | 3768篇 |
2010年 | 3376篇 |
2009年 | 4271篇 |
2008年 | 3731篇 |
2007年 | 3838篇 |
2006年 | 3562篇 |
2005年 | 2899篇 |
2004年 | 2971篇 |
2003年 | 2633篇 |
2002年 | 2302篇 |
2001年 | 1971篇 |
2000年 | 1954篇 |
1999年 | 1535篇 |
1998年 | 1595篇 |
1997年 | 1465篇 |
1996年 | 1243篇 |
1995年 | 1242篇 |
1994年 | 1042篇 |
1993年 | 1007篇 |
1992年 | 934篇 |
1991年 | 967篇 |
1990年 | 935篇 |
1989年 | 817篇 |
1988年 | 751篇 |
1987年 | 883篇 |
1986年 | 773篇 |
1985年 | 946篇 |
1984年 | 1070篇 |
1983年 | 1031篇 |
1982年 | 950篇 |
1981年 | 891篇 |
1980年 | 792篇 |
1979年 | 748篇 |
1978年 | 726篇 |
1977年 | 618篇 |
1976年 | 626篇 |
1975年 | 613篇 |
1974年 | 589篇 |
1973年 | 656篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
921.
922.
923.
924.
925.
926.
927.
The composition of Hippidion diet, and possible changes that could relate to its extinction, were evaluated in the Argentinean-Chilean Central Andes, a Neotropical environment characterized by arid to semiarid conditions (Andean hot and cold deserts). Microhistological analyses were made on feces of Hippidion found at Los Morrillos (31°43′S–68°42′W, 3000 m a.s.l.) and Gruta del Indio (34°35′S, 68°22′W, 660 m a.s.l.). At Gruta del Indio the diet of Hippidion was based mainly on woody species. At Los Morrillos, it was based on herbaceous species.This flexibility in diet composition could be a relative adaptive advantage allowing a longer permanence of this species in comparison to others recorded in the region (such as Megatheriumand Mylodon). Nevertheless, this advantage was not enough to guarantee its survival during the Holocene. Extinction could have been affected by diverse agents, such as growing aridification of the area, increasing competition with other species (mainly Lama guanicoe), and human presence, along with a relatively low population density (as expected from the limited presence of Hippidion at the archaeological and palaeontological sites of South America. At Gruta del Indio significant changes in the diet of Hippidion corresponding to different intervals of the period 31,000–9000 14C BP are not evident. Given this evidence for similar diets for Hippidion throughout the late Quaternary, other factors need to be considered to explain the extinction of this horse. 相似文献
928.
A.E. Dodonov V.G. Trifonov T.P. Ivanova V.Yu. Kuznetsov F.E. Maksimov D.M. Bachmanov T.A. Sadchikova A.N. Simakova H. Minini A.-M. Al-Kafri O. Ali 《Quaternary International》2008,190(1):158
In order to provide new data on the neotectonics and geodynamic properties of western Syria, studies of marine terraces have been carried out. The most attention was paid to the lower terraces in the range of 3–5 to 30–35 m above sea level, because they have more complete distributions along the shore. The lower terraces were examined along the coastal area from Tartus to Latakia, and along the carbonate cliff on Arwad Island. Seven 230Th/U dates for these terraces are in the range of 85–130 ka, suggesting the age interval of the last interglacial (MIS 5). New dates on the lower terraces provide a basis for stratigraphical and geomorphological interpretation as well as neotectonic reconstruction. According to the geomorphological data and lithological composition of those terraces, two main uplifted blocks can be established. One coincides with the Latakia block, and another corresponds to the western margin of the Banias volcanic plateau. These blocks are divided by a subsided structure corresponding to the Nahr el Kebir graben. The amplitude of neotectonic uplifting in the Latakia and Banias blocks reaches 15–20 m for the Late Pleistocene. 相似文献
929.
E. Wiedner D. Scholz A. Mangini D. Polag C. Mühlinghaus M. Segl 《Quaternary International》2008,187(1):15
Many speleothems show evidence for calcite precipitation under disequilibrium conditions. To improve the understanding of these kinetic processes, several laboratory experiments were performed to study the fractionation of stable oxygen and carbon isotopes during the precipitation of calcite. Carbonate was precipitated under controlled conditions from both a body of standing water (beaker experiments) and a solution flowing along a channel (channel experiments) at a relative humidity of 100%. Slow degassing of CO2, simulated by the beaker experiments, results in δ18O values in equilibrium with the solution. In contrast, the δ13C values show a significant enrichment, inversely proportional to the height of the solution in the beakers. Fast degassing of CO2, simulated by the channel experiments, showed an enrichment of both δ13C and δ18O and a slope of Δδ13C/Δδ18O of 1.4±0.6. These results represent experimental evidence for the Hendy effect, which is manifested in (i) a progressive increase in δ18O and δ13C away from the growth axis and (ii) a positive correlation between δ18O and δ13C along a single growth layer of a stalagmite. 相似文献
930.