全文获取类型
收费全文 | 31432篇 |
免费 | 4889篇 |
国内免费 | 7203篇 |
专业分类
测绘学 | 7045篇 |
大气科学 | 5117篇 |
地球物理 | 6526篇 |
地质学 | 12724篇 |
海洋学 | 3957篇 |
天文学 | 728篇 |
综合类 | 2883篇 |
自然地理 | 4544篇 |
出版年
2024年 | 99篇 |
2023年 | 311篇 |
2022年 | 977篇 |
2021年 | 1177篇 |
2020年 | 1345篇 |
2019年 | 1551篇 |
2018年 | 1273篇 |
2017年 | 1586篇 |
2016年 | 1622篇 |
2015年 | 1817篇 |
2014年 | 1943篇 |
2013年 | 2305篇 |
2012年 | 2116篇 |
2011年 | 2209篇 |
2010年 | 1722篇 |
2009年 | 1888篇 |
2008年 | 1934篇 |
2007年 | 2119篇 |
2006年 | 2016篇 |
2005年 | 1810篇 |
2004年 | 1673篇 |
2003年 | 1431篇 |
2002年 | 1287篇 |
2001年 | 1102篇 |
2000年 | 957篇 |
1999年 | 858篇 |
1998年 | 797篇 |
1997年 | 640篇 |
1996年 | 583篇 |
1995年 | 498篇 |
1994年 | 454篇 |
1993年 | 381篇 |
1992年 | 244篇 |
1991年 | 200篇 |
1990年 | 147篇 |
1989年 | 107篇 |
1988年 | 114篇 |
1987年 | 62篇 |
1986年 | 34篇 |
1985年 | 34篇 |
1984年 | 22篇 |
1982年 | 13篇 |
1981年 | 9篇 |
1980年 | 13篇 |
1979年 | 10篇 |
1978年 | 13篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1973年 | 2篇 |
1954年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
281.
282.
A multidisciplinary study in the Gulf of Cadiz is revisited, using additional diagnostic modelling tools. The dissolved trace metal (Cu, Ni, Zn, Co) distributions in the Gulf of Cadiz are analysed using modelled tracer evolutions, field observations and the concept of tracer ages. This study shows that a significant part of the observed metal distributions can be explained by the metal inputs of three river systems (Guadiana, Rio Tinto and Odiel, Guadalquivir) discharging into the Gulf of Cadiz, while the remainder of the signal is most likely associated with the benthic metal remobilisation along the shelf of this coastal region. 相似文献
283.
A primitive equation model and a statistical predictor are coupled by data assimilation in order to combine the strength of both approaches. In this work, the system of two-way nested models centred in the Ligurian Sea and the satellite-based ocean forecasting (SOFT) system predicting the sea surface temperature (SST) are used. The data assimilation scheme is a simplified reduced order Kalman filter based on a constant error space. The assimilation of predicted SST improves the forecast of the hydrodynamic model compared to the forecast obtained by assimilating past SST observations used by the statistical predictor. This study shows that the SST of the SOFT predictor can be used to correct atmospheric heat fluxes. Traditionally this is done by relaxing the model SST towards the climatological SST. Therefore, the assimilation of SOFT SST and climatological SST are also compared. 相似文献
284.
基于BP人工神经网络的水体遥感测深方法研究 总被引:5,自引:0,他引:5
利用Landsat7ETM+遥感图像反射率和实测水深值之间的相关性,建立了动量BP人工神经网络水深反演模型,并对长江口南港河段水深进行了反演.结果表明:具有较强非线性映射能力的动量BP神经网络模型能较好地反演出长江口南港河段的水深分布情况;由于受长江口水体高含沙量的影响,模型对小于5 m的水深值反演精度较高,而对大于10 m的水深值反演精度较低. 相似文献
285.
海洋作业渔船管理系统的设计与运行试验 总被引:1,自引:0,他引:1
对渔政管理指挥系统建设项日中的业务软件部分渔船管理系统的设计方案进行了介绍。根据我国渔洋作业渔船的实际管理模式,提出了渔船管理系统设计方案。系统通过网络化的业务处理和管理流程,规范渔船建造、审批、登记以及捕捞许可证发放等管理业务,实现渔船控制指标的统一分配,以控制捕捞业发展规模和保护我国的渔业资源。系统以Microsoft VB6.0,Delphi6.0开发,在Window98/2000/XP环境下运行。通过运行试验,对系统运行环境进行了评估,为渔政管理信息化的建设、系统升级提供了经验和技术依据。 相似文献
286.
LIANGDong-fang CHENGLiang KervinYEOW 《中国海洋工程》2005,19(2):269-286
A numerical model for the self-burial of a pipeline trench is developed. Morphological evolutions of a pipeline trench under steady-current or oscillatory-flow conditions are simulated with/without a pipeline inside the trench. The oscillatory flow in this study represents the action of waves. The two-dimensional Reynolds-averaged continuity and Navier-Stokes equations with the standard k-e turbulence closure, as well as the sediment transport equations, are solved with the finite difference method in a eurvilirrear coordinate system. Both bed and suspended loads of sediment transport are included in the morphological model. Because of the lack of experimental data on the backfilling of pipeline trenches, the numericalmodel is firstly verified against three closely-relevant experiments available in literature. A detailed measurement of the channel migration phenomenon under steady currents is employed for the assessment of the integral performance of themodel. The two experimental results from U-tube tests are used to validate the model‘s ability in predicting oscillatory flows. Different time-marching schemes are employed for the morphological computation under unidirectional and oscillatory conditions. It is found that vortex motions within the trench play an important role in the trench development. 相似文献
287.
Darío R. Minkoff Mauricio Escapa Flix E. Ferramola Silvio D. Maraschín Jorge O. Pierini Gerardo M.E. Perillo Claudio Delrieux 《Estuarine, Coastal and Shelf Science》2006,69(3-4):403
The Bahía Blanca Estuary (38° 50′ S, and 62° 30′ W) presents salt marshes where interactions between the local flora (Sarcocornia perennis) and fauna (Chasmagnathus granulatus) generate some kind of salt pans that alter the normal water circulation and condition its flow and course towards tidal creeks. The crab–vegetation dynamics in the salt marsh presents variations that cannot be quantified in a reasonable period of time. The interaction between S. perennis plant and C. granulatus crab is based on simple laws, but its result is a complex biological mechanism that causes an erosive process on the salt marsh and favors the formation of tidal creeks. To study it, a Cellular Automata model is proposed, based on the laws deduced from the observation of these phenomena in the field, and then verified with measurable data within macroscale time units. Therefore, the objective of this article is to model how the interaction between C. granulatus and S. perennis modifies the landscape of the salt marsh and influences the path of tidal creeks. The model copies the basic laws that rule the problem based on purely biological factors.The Cellular Automata model proved capable of reproducing the effects of the interaction between plants and crabs in the salt marsh. A study of the water drainage of the basins showed that this interaction does indeed modify the development of tidal creeks. Model dynamics would likewise follow different laws, which would provide a different formula for the probability of patch dilation. The patch shape can be obtained changing the pattern that dilates. 相似文献
288.
289.
The phase one project of the twin jetties at the Tao-er Estuary yields no effect on the flow, and there is a large area of deposition. A numerical model is employed to simulate the flow field, and the scouring and silting in the channel be-tween the two jetties are analyzed. The results show that the effective tidal flux between the two jetties is reduced due to the notch located at the heel of the east jetty, and the effect of contraction-flush is not obvious. As for the regulation of this kind of estuary under the tide action, the capability of tidal flux should be fully used. 相似文献
290.
The steady response of the ventilated thermocline to an increase in Ekman pumping is investigated, focusing on the effect
of the mixed layer depth distribution on the subsurface density anomaly. We consider only the subtropical gyre, and the mixed
layer is assumed to be deep in the northwest and shallow elsewhere with a narrow transition zone separating the deep and shallow
mixed layer regions. At the intersection of this narrow transition zone and the outcrop line, low potential vorticity fluid
is subducted into and ventilates the thermocline. In such a situation, an enhancement of the Ekman pumping confined to the
northern subtropical gyre leads to pronounced subsurface cold anomalies in the southern subtropics, which is free of anomalous
forcing. These density anomalies are much greater than those that occur when either the mixed layer depth is zonally uniform
or the Ekman pumping is enhanced in the whole subtropical gyre. They are caused by anomalous changes in the trajectory of
the low potential vorticity fluid in response to anomalous Sverdrup flow.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献