全文获取类型
收费全文 | 223篇 |
免费 | 39篇 |
国内免费 | 17篇 |
专业分类
测绘学 | 43篇 |
大气科学 | 44篇 |
地球物理 | 79篇 |
地质学 | 50篇 |
海洋学 | 28篇 |
天文学 | 9篇 |
综合类 | 4篇 |
自然地理 | 22篇 |
出版年
2022年 | 3篇 |
2021年 | 2篇 |
2020年 | 11篇 |
2019年 | 12篇 |
2018年 | 5篇 |
2017年 | 14篇 |
2016年 | 11篇 |
2015年 | 12篇 |
2014年 | 13篇 |
2013年 | 8篇 |
2012年 | 10篇 |
2011年 | 8篇 |
2010年 | 6篇 |
2009年 | 16篇 |
2008年 | 14篇 |
2007年 | 8篇 |
2006年 | 10篇 |
2005年 | 16篇 |
2004年 | 12篇 |
2003年 | 8篇 |
2002年 | 12篇 |
2001年 | 3篇 |
2000年 | 10篇 |
1999年 | 2篇 |
1998年 | 8篇 |
1997年 | 5篇 |
1996年 | 4篇 |
1995年 | 6篇 |
1994年 | 3篇 |
1993年 | 9篇 |
1992年 | 4篇 |
1991年 | 6篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有279条查询结果,搜索用时 15 毫秒
51.
There has been a long-standing debate concerning how dangerous seismic surveys are with respect to marine life. Marine seismic
work today is dominated by airgun technology, where high energy is generated by a release of compressed air into the water.
The objective of the “Time coded impulse seismic technique” project is to examine whether a new low energy acoustic source
can be used for seismic purposes. If the method turns out to be successful, the low output energy and continuous operation
will make the source suitable in environmental sensitive areas. The Low level Acoustic Combustion Source (LACS) is a petrol
driven pulsed underwater acoustic source. It operates at a few meters depth, and each shot can be digitally controlled from
the surface by a computer located in the mother vessel. A presentation of the recorded LACS signal characteristics, the modulation,
the Pseudo Noise coding/decoding principles and field test results, is given. The importance of using an optimized code with
fine resolution and of using the near field recording as a correlator sequence is demonstrated. Clear correlation peaks could
then be seen from the bottom and sub bottom reflectors. 相似文献
52.
53.
Carbon dioxide flux techniques performed during GasEx-98 总被引:2,自引:0,他引:2
Wade R. McGillis James B. Edson Jonathan D. Ware John W. H. Dacey Jeffrey E. Hare Christopher W. Fairall Rik Wanninkhof 《Marine Chemistry》2001,75(4):851
A comprehensive study of air–sea interactions focused on improving the quantification of CO2 fluxes and gas transfer velocities was performed within a large open ocean CO2 sink region in the North Atlantic. This study, GasEx-98, included shipboard measurements of direct covariance CO2 fluxes, atmospheric CO2 profiles, atmospheric DMS profiles, water column mass balances of CO2, and measurements of deliberate SF6–3He tracers, along with air–sea momentum, heat, and water vapor fluxes. The large air–sea differences in partial pressure of CO2 caused by a springtime algal bloom provided high signals for accurate CO2 flux measurements. Measurements were performed over a wind speed range of 1–16 m s−1 during the three-week process study. This first comparison between the novel air-side and more conventional water column measurements of air–sea gas transfer show a general agreement between independent air–sea gas flux techniques. These new advances in open ocean air–sea gas flux measurements demonstrate the progress in the ability to quantify air–sea CO2 fluxes on short time scales. This capability will help improve the understanding of processes controlling the air–sea fluxes, which in turn will improve our ability to make regional and global CO2 flux estimates. 相似文献
54.
本文详细讨论了利用井下和地面观测直达波到时资料联合确定震源位置,发震时刻及区域平均波速的最优化方法,该方法对震源深度及波速的确定给予特别的重视与处理。理论检验和实际算例表明,用该方法编制的程序定位精度高,计算速度快,可以在地层差异小的地区推广应用。 相似文献
55.
56.
Turbulence statistics obtained by direct numerical simulations are analysed to investigate spatial heterogeneity within regular
arrays of building-like cubical obstacles. Two different array layouts are studied, staggered and square, both at a packing
density of . The flow statistics analysed are mean streamwise velocity (), shear stress (), turbulent kinetic energy (k) and dispersive stress fraction (). The spatial flow patterns and spatial distribution of these statistics in the two arrays are found to be very different.
Local regions of high spatial variability are identified. The overall spatial variances of the statistics are shown to be
generally very significant in comparison with their spatial averages within the arrays. Above the arrays the spatial variances
as well as dispersive stresses decay rapidly to zero. The heterogeneity is explored further by separately considering six
different flow regimes identified within the arrays, described here as: channelling region, constricted region, intersection
region, building wake region, canyon region and front-recirculation region. It is found that the flow in the first three regions
is relatively homogeneous, but that spatial variances in the latter three regions are large, especially in the building wake
and canyon regions. The implication is that, in general, the flow immediately behind (and, to a lesser extent, in front of)
a building is much more heterogeneous than elsewhere, even in the relatively dense arrays considered here. Most of the dispersive
stress is concentrated in these regions. Considering the experimental difficulties of obtaining enough point measurements
to form a representative spatial average, the error incurred by degrading the sampling resolution is investigated. It is found
that a good estimate for both area and line averages can be obtained using a relatively small number of strategically located
sampling points. 相似文献
57.
58.
We examine the simulated future change of the North Atlantic winter climate influenced by anthropogenic greenhouses gases
and sulfate aerosol. Two simulations performed with the climate model ECHAM4/OPYC3 are investigated: a simulation forced by
greenhouse gases and a simulation forced by greenhouse gases and sulfate aerosol. Only the direct aerosol effect on the clear-sky
radiative fluxes is considered. The sulfate aerosol has a significant impact on temperature, radiative quantities, precipitation
and atmospheric dynamics. Generally, we find a similar, but weaker future climate response if sulfate aerosol is considered
additionally. Due to the induced negative top-of-the-atmosphere radiative forcing, the future warming is attenuated. We find
no significant future trends in North Atlantic Oscillation (NAO) index in both simulations. However, the aerosol seems to
have a balancing effect on the occurence of extreme NAO events. The simulated correlation patterns of the NAO index with temperature
and precipitation, respectively, agree well with observations up to the present. The extent of the regions influenced by the
NAO tends to be reduced under strong greenhouse gas forcing. If sulfate is included and the warming is smaller, this tendency
is reversed. Also, the future decrease in baroclinicity is smaller due to the aerosols’ cooling effect and the poleward shift
in track density is partly offset. Our findings imply that in simulations where aerosol cooling is neglected, the magnitude
of the future warming over the North Atlantic region is overestimated, and correlation patterns differ from those based on
the future simulation including aerosols. 相似文献
59.
通过分析黄河下游枯季径流的影响因素 ,主要为花园口水文站径流量和下游的引黄量这两个因子 ,花园口水文站径流量和下游的引黄量可作为输入层中的影响因子 ,下游利津站的流量作为输出层。应用多层前向人工神经网络理论 ,构造四套枯季径流实时预测的BP神经网络模型 ,使用花园口—利津水文站 2 6年的完整序列测流资料训练和检验网络并用于预测 相似文献
60.
该文叙述在数值天气预报中直接应用辐射率而不经过反演的原因,变分法在辐射率直接应用中的作用,以及介绍变分问题计算中的伴随方法。还指出ATOVS辐射率同样可以在NWP中直接应用。最后,介绍业务NWP直接应用辐射率的情况。 相似文献