全文获取类型
收费全文 | 2060篇 |
免费 | 385篇 |
国内免费 | 600篇 |
专业分类
测绘学 | 191篇 |
大气科学 | 152篇 |
地球物理 | 689篇 |
地质学 | 1355篇 |
海洋学 | 258篇 |
天文学 | 57篇 |
综合类 | 199篇 |
自然地理 | 144篇 |
出版年
2024年 | 5篇 |
2023年 | 15篇 |
2022年 | 53篇 |
2021年 | 54篇 |
2020年 | 74篇 |
2019年 | 90篇 |
2018年 | 73篇 |
2017年 | 70篇 |
2016年 | 95篇 |
2015年 | 115篇 |
2014年 | 142篇 |
2013年 | 141篇 |
2012年 | 125篇 |
2011年 | 125篇 |
2010年 | 125篇 |
2009年 | 149篇 |
2008年 | 123篇 |
2007年 | 148篇 |
2006年 | 153篇 |
2005年 | 133篇 |
2004年 | 109篇 |
2003年 | 97篇 |
2002年 | 89篇 |
2001年 | 81篇 |
2000年 | 86篇 |
1999年 | 70篇 |
1998年 | 72篇 |
1997年 | 68篇 |
1996年 | 59篇 |
1995年 | 44篇 |
1994年 | 53篇 |
1993年 | 39篇 |
1992年 | 42篇 |
1991年 | 30篇 |
1990年 | 24篇 |
1989年 | 21篇 |
1988年 | 15篇 |
1987年 | 11篇 |
1986年 | 9篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 5篇 |
1954年 | 3篇 |
排序方式: 共有3045条查询结果,搜索用时 15 毫秒
161.
Aspects of communities and events in the concentrating ponds (S.G. 1.130 to 1.214) and salt crystallizing ponds (S.G. 1.215 to 1.264) of solar saltworks pertinent to salt manufacture are described. Communities that aid salt manufacture enable continuous and efficient production of high quality salt at a saltworks' design capacity, and they provide important controls on levels of organic matter in the brine. Fluctuating salinities, high concentrations of nutrients, and petroleum products are disturbances that causeAphanothece halophytica andDunaliella salina to release excessive quantities of organic matter, and that suppress or cause death to nutrient stripping organisms. Disturbances result in decreased quality and quantity of salt and increased costs for salt harvest, washing, and pond upkeep. Organic matter can be controlled by management techniques that keep nutrient stripping communities at proper levels and maintain a narrow and unchanging range of salinities in each pond, by constructing pond dikes able to withstand wind and water erosion, and by preventing spills of petroleum products in the ponds. 相似文献
162.
163.
Nitrogen and sulfur species in Antarctic aerosols at Mawson,Palmer Station,and Marsh (King George Island) 总被引:4,自引:0,他引:4
D. L. Savoie J. M. Prospero R. J. Larsen F. Huang M. A. Izaguirre T. Huang T. H. Snowdon L. Custals C. G. Sanderson 《Journal of Atmospheric Chemistry》1993,17(2):95-122
High volume bulk aerosol samples were collected continuously at three Antarctic sites: Mawson (67.60° S, 62.50° E) from 20 February 1987 to 6 January 1992; Palmer Station (64.77° S, 64.06° W) from 3 April 1990 to 15 June 1991; and Marsh (62.18° S, 58.30° W) from 28 March 1990, to 1 May 1991. All samples were analyzed for Na+, SO
4
2–
, NO
3
–
, methanesulfonate (MSA), NH
4
+
,210Pb, and7Be. At Mawson for which we have a multiple year data set, the annual mean concentration of each species sometimes vary significantly from one year to the next: Na+, 68–151 ng m–3; NO
3
–
, 25–30 ng m–3; nss SO
4
2–
, 81–97 ng m–3; MSA, 19–28 ng m–3; NH
4
+
, 16–21 ng m–3;210Pb, 0.75–0.86 fCi m–3. Results from multiple variable regression of non-sea-salt (nss) SO
4
2–
with MSA and NO
3
–
as the independent variables indicates that, at Mawson, the nss SO
4
2–
/MSA ratio resulting from the oxidation of dimethylsulfide (DMS) is 2.80±0.13, about 13% lower than our earlier estimate (3.22) that was based on 2.5 years of data. A similar analysis indicates that the ratio at Palmer is about 40% lower, 1.71±0.10, and more comparable to previous results over the southern oceans. These results when combined with previously published data suggest that the differences in the ratio may reflect a more rapid loss of MSA relative to nss SO
4
2–
during transport over Antarctica from the oceanic source region. The mean210Pb concentrations at Palmer and Marsh and the mean NO
3
–
concentration at Palmer are about a factor of two lower than those at Mawson. The210Pb distributions are consistent with a210Pb minimum in the marine boundary layer in the region of 40°–60° S. These features and the similar seasonalities of NO
3
–
and210Pb at Mawson support the conclusion that the primary source regions for NO
3
–
are continental. In contrast, the mean concentrations of MSA, nss SO
4
2–
, and NH
4
+
at Palmer are all higher than those at Mawson: MSA by a factor of 2; nss SO
4
2–
by 10%; and NH
4
+
by more than 50%. However, the factor differences exhibit substantial seasonal variability; the largest differences generally occur during the austral summer when the concentrations of most of the species are highest. NH
4
+
/(nss SO
4
2–
+MSA) equivalent ratios indicate that NH3 neutralizes about 60% of the sulfur acids during December at both Mawson and Palmer, but only about 30% at Mawson during February and March. 相似文献
164.
165.
166.
167.
The biogeochemical sulfur cycle in the marine boundary layer over the Northeast Pacific Ocean 总被引:1,自引:0,他引:1
T. S. Bates J. E. Johnson P. K. Quinn P. D. Goldan W. C. Kuster D. C. Covert C. J. Hahn 《Journal of Atmospheric Chemistry》1990,10(1):59-81
The major components of the marine boundary layer biogeochemical sulfur cycle were measured simultaneously onshore and off the coast of Washington State, U.S.A. during May 1987. Seawater dimethylsulfide (DMS) concentrations on the continental shelf were strongly influenced by coastal upwelling. Concentration further offshore were typical of summer values (2.2 nmol/L) at this latitude. Although seawater DMS concentrations were high on the biologically productive continental shelf (2–12 nmol/L), this region had no measurable effect on atmospheric DMS concentrations. Atmospheric DMS concentrations (0.1–12 nmol/m3), however, were extremely dependent upon wind speed and boundary layer height. Although there appeared to be an appreciable input of non-sea-salt sulfate to the marine boundary layer from the free troposphere, the local flux of DMS from the ocean to the atmosphere was sufficient to balance the remainder of the sulfur budget. 相似文献
168.
试验确定,在用HCI和NaOH试剂解离硅质胶结的沉积岩时,浓度5%的试剂即可达到解离度95%以上,且颗粒表面特征、重矿物数量和重矿物标型特征较浓度10%的试剂处理的样品保存得更好。 相似文献
169.
法国Echassieres地区石英网脉中黑钨矿及其共生矿物的固溶体研究 总被引:1,自引:0,他引:1
Echassiares石英网脉中的黑钨矿主要系钨锰矿一钨铁矿系列中的铁端员矿物一钨铁
矿,富泥但贫担,当其与妮铁矿共生时,钨铁矿可含8.91% Nb205。在该矿物中常见的元素置换
有:(1)Fe2+→Mn2+;(2)Wg6+Fe2+→Nb5+ +Fe+3 (3) 3W6+ +Fe2+ →4Nb5+。 妮铁矿呈它形,富含Ta. W,Ti。钨铁捉矿以枝状形态位于钨铁矿和妮铁矿之间,形成完整的矿物组合。Beauvoir花岗岩的侵位带入的热液交代钨铁矿是形成这种矿物组合的主要原因。同时,铅钨铁矿中的裂隙带或其边部还局部发生钨锰矿化。 相似文献
170.
Thomas Striebel Wolfgang Schäfer Stefan Peiffer 《Aquatic Sciences - Research Across Boundaries》1991,53(4):346-366
A field study on the geochemical properties of a chemically-stressed limnic environment was performed in Lake Silbersee, which receives leachate water of high inorganic loading from an upgradient landfill site. The highly concentrated sulfate ion in groundwater, when entering the pore water system of the lake, gives rise to an intensive microbial sulfate reduction. A diagenetic approach was used to explain the existence of a marine-like aqueous system within a geologically slightly acidic aquifer, consisting of a well-buffered lake water and an alkalinity producing, excess sulphide containing sediment pore water system. 相似文献