全文获取类型
收费全文 | 707篇 |
免费 | 19篇 |
国内免费 | 2篇 |
专业分类
测绘学 | 12篇 |
大气科学 | 78篇 |
地球物理 | 167篇 |
地质学 | 271篇 |
海洋学 | 57篇 |
天文学 | 86篇 |
综合类 | 3篇 |
自然地理 | 54篇 |
出版年
2021年 | 7篇 |
2020年 | 7篇 |
2018年 | 11篇 |
2016年 | 12篇 |
2014年 | 17篇 |
2013年 | 26篇 |
2012年 | 20篇 |
2011年 | 20篇 |
2010年 | 13篇 |
2009年 | 29篇 |
2008年 | 30篇 |
2007年 | 24篇 |
2006年 | 31篇 |
2005年 | 23篇 |
2004年 | 22篇 |
2003年 | 17篇 |
2002年 | 22篇 |
2001年 | 19篇 |
2000年 | 7篇 |
1999年 | 15篇 |
1998年 | 10篇 |
1997年 | 10篇 |
1996年 | 7篇 |
1995年 | 7篇 |
1994年 | 9篇 |
1993年 | 9篇 |
1992年 | 8篇 |
1991年 | 10篇 |
1987年 | 8篇 |
1985年 | 5篇 |
1984年 | 8篇 |
1983年 | 11篇 |
1982年 | 10篇 |
1981年 | 7篇 |
1980年 | 8篇 |
1978年 | 8篇 |
1977年 | 12篇 |
1976年 | 7篇 |
1975年 | 7篇 |
1974年 | 9篇 |
1972年 | 11篇 |
1970年 | 7篇 |
1968年 | 6篇 |
1964年 | 5篇 |
1959年 | 5篇 |
1955年 | 7篇 |
1954年 | 9篇 |
1952年 | 6篇 |
1950年 | 8篇 |
1948年 | 8篇 |
排序方式: 共有728条查询结果,搜索用时 171 毫秒
361.
Nelson D. Padilla Carlton M. Baugh Vincent R. Eke Peder Norberg Shaun Cole Carlos S. Frenk Darren J. Croton Ivan K. Baldry Joss Bland-Hawthorn Terry Bridges Russell Cannon Matthew Colless Chris Collins Warrick Couch Gavin Dalton Roberto De Propris Simon P. Driver George Efstathiou Richard S. Ellis Karl Glazebrook Carole Jackson Ofer Lahav Ian Lewis Stuart Lumsden Steve Maddox Darren Madgwick John A. Peacock Bruce A. Peterson Will Sutherland Keith Taylor 《Monthly notices of the Royal Astronomical Society》2004,352(1):211-225
362.
Karl Rakos James Schombert Andrew Odell Michael Maitzen 《Astrophysics and Space Science》2003,284(2):803-806
We present the results of a narrow band imaging project of dwarf and giant ellipticals in the Fornax (z = 0.01), Coma (z = 0.02), A2218 (z= 0.17) and A2125 (z = 0.24) cluster. Differing from spectral line projects, we determine the mean age and metallicity of the underlying stellar populations in galaxies by measurement of the position of the RGB and MS turnoff through continuum colors (3500 Å, 4100 Å, 4675 Å and5500 Å in rest system, i.e. modified Strømgren colors). Our sample includes 120 galaxies between M = –16 and –23 in Fornax and Coma plus over 300 galaxies in distant clusters. We find the color-magnitude relation to be linear for only the brightest galaxies with an increasing amount of scatter for low luminosity ellipticals. Bright ellipticals are found to have a metallicity between –0.5 and +0.5, but low luminosity ellipticals have values that range from –2 to solar. Our age index finds a weak correlation between luminosity and mean stellar age in ellipticals such that bright ellipticals are 2 to 3 Gyrs younger than low luminosity ellipticals. 相似文献
363.
Karl S. Zimmerer 《Global Environmental Change》2011,21(3):917-934
Spate irrigation is increasingly recognized as contributing to potential of accessible water-resource use, local food production, and resource sustainability. This study constructs an approach to spate irrigation as a landscape technology by selectively fusing concepts of resilience ecology, political ecology, and actor-network theory. It is applied to a case study of the Calicanto area (Cochabamba, Bolivia) with emphasis on the 1990-1993 period. Calicanto spate irrigation provided an effective landscape technology over more than 15 km2 and 3500 fields via a 65-km canal network, thus comprising the largest spate-irrigated area of Latin America. Use of this irrigation technology was linked to climate variability and environmental variation as well as landscape features, livelihood diversification including widespread migration, and innovative high-agrobiodiversity land use, in addition to community resource management, settlement patterning, population density, and production intensity. Notwithstanding social-ecological resilience and versatility, the trajectory of this irrigation underwent major change with new waterworks launched in 1993. Key lessons for the related social-ecological sciences, development policy, and sustainability perspectives include: (i) versatility and viability of spate irrigation hinges on multiple social-ecological links; and (ii) its limitations include eclipse via irrigation trajectories lacking social-ecological analytic and conceptual capacities, and widespread albeit largely unacknowledged biases against the landscape technology of spate irrigation. 相似文献
364.
Karl F. Nordstrom Nancy L. Jackson Katherine H. Korotky Jack A. Puleo 《地球表面变化过程与地形》2011,36(6):779-789
Wind characteristics and aeolian transport were measured on a naturally evolving beach and dune and a nearby site where the beach is raked and sand‐trapping fences are deployed. The beaches were composed of moderately well sorted to very well sorted fine to medium sand. The backshore at the raked site was wider and the foredune was more densely vegetated and about 1 m higher than at the unraked site. Wind speeds were monitored using anemometers placed at 1 m elevation and sand transport was monitored using vertical traps during oblique onshore, alongshore and offshore winds occurring in March and April 2009. Inundation of the low backshore through isolated swash channels prevented formation of a continuously decreasing cross‐shore moisture gradient. The surface of the berm crest was dryer than the backshore, making the berm crest the greatest source of offshore losses during offshore winds. The lack of storm wrack on the raked beach reduced the potential for sediment accumulation seaward of the dune crest during onshore winds, and the higher dune crest reduced wind speeds and sediment transport from the dune to the backshore during offshore winds. Accretion at wrack seaward of the dune toe on the unraked beach resulted in a wider dune field and higher, narrower backshore. Although fresh wrack is an effective local trap for aeolian transport, wrack that becomes buried appears to have little effect as a barrier and can supply dry sand for subsequent transport. Aeolian transport rates were greater on the narrower but dryer backshore of the unraked site. Vegetation growth may be necessary to trap sand within zones of buried wrack in order to allow new incipient foredunes to evolve. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
365.
Pump tests and geophysical logs acquired in a fluvial sandstone aquifer within the resource-rich Moncton Subbasin of New Brunswick, Canada, have been used to characterize fracture patterns and flow directions for purposes of developing a water-wellfield protection plan. Fracture patterns consist of three high-angle sets, and a low-angle set parallel to bedding. NW-trending high-angle fractures, predominantly in fluvial sandstone units, appear to be most important in controlling groundwater flow directions. This contrasts with an earlier regional hydrogeological study that attributed most flow to sub-horizontal bedding-plane fractures. Water levels monitored during a 72-h pump test revealed drawdown extension parallel to the NW-trending fracture set. Drawdown curves indicate that the aquifer is laterally constrained—likely reflecting differences in fracturing observed between the channelized sandstone and surrounding shale units. As a result, groundwater flow induced by pumping is influenced by both fracture anisotropy and by the heterogeneity of the fluvial depositional environment. Relationships observed between fracture patterns, regional geological structure and lithology provide a basis for extrapolating the conceptual model to other nearby areas in the region, where potential impacts of geological resource development on groundwater are attracting public concern. 相似文献
366.
Addi Bischoff Kathryn A. Dyl Marian Horstmann Karen Ziegler Karl Wimmer Edward D. Young 《Meteoritics & planetary science》2013,48(4):628-640
The Villalbeto de la Peña meteorite that fell in 2004 in Spain was originally classified as a moderately shocked L6 ordinary chondrite. The recognition of fragments within the Villalbeto de la Peña meteorite clearly bears consequences for the previous classification of the rock. The oxygen isotope data clearly show that an exotic eye‐catching, black, and plagioclase‐(maskelynite)‐rich clast is not of L chondrite heritage. Villalbeto de la Peña is, consequently, reclassified as a polymict chondritic breccia. The oxygen isotope data of the clast are more closely related to data for the winonaite Tierra Blanca and the anomalous silicate‐bearing iron meteorite LEW 86211 than to the ordinary chondrite groups. The REE‐pattern of the bulk inclusion indicates genetic similarities to those of differentiated rocks and their minerals (e.g., lunar anorthosites, eucritic, and winonaitic plagioclases) and points to an igneous origin. The An‐content of the plagioclase within the inclusion is increasing from the fragment/host meteorite boundary (approximately An10) toward the interior of the clast (approximately An52). This is accompanied by a successive compositionally controlled transformation of plagioclase into maskelynite by shock. As found for plagioclase, compositions of individual spinels enclosed in plagioclase (maskelynite) also vary from the border toward the interior of the inclusion. In addition, huge variations in oxygen isotope composition were found correlating with distance into the object. The chemical and isotopical profiles observed in the fragment indicate postaccretionary metamorphism under the presence of a volatile phase. 相似文献
367.
Robust estimation by expectation maximization algorithm 总被引:2,自引:2,他引:0
Karl Rudolf Koch 《Journal of Geodesy》2013,87(2):107-116
A mixture of normal distributions is assumed for the observations of a linear model. The first component of the mixture represents the measurements without gross errors, while each of the remaining components gives the distribution for an outlier. Missing data are introduced to deliver the information as to which observation belongs to which component. The unknown location parameters and the unknown scale parameter of the linear model are estimated by the EM algorithm, which is iteratively applied. The E (expectation) step of the algorithm determines the expected value of the likelihood function given the observations and the current estimate of the unknown parameters, while the M (maximization) step computes new estimates by maximizing the expectation of the likelihood function. In comparison to Huber’s M-estimation, the EM algorithm does not only identify outliers by introducing small weights for large residuals but also estimates the outliers. They can be corrected by the parameters of the linear model freed from the distortions by gross errors. Monte Carlo methods with random variates from the normal distribution then give expectations, variances, covariances and confidence regions for functions of the parameters estimated by taking care of the outliers. The method is demonstrated by the analysis of measurements with gross errors of a laser scanner. 相似文献
368.
369.
Karl S. Zimmerer 《The Professional geographer》2013,65(3):335-356
The global shift to small- and medium-scale irrigation is potentially compatible with high-agrobiodiversity production. A case study of the Cochabamba region in central Bolivia between 1990 and 2002 is designed to examine new interactions of irrigation with agrobiodiversity through change and continuity of landscape structures and functions. Irrigation change contributed to increased commercial potato and peach farming. Still persistent interactions of canal woodland habitat (landscape matrix including uncultivated or “wild” agrobiodiversity) with patches of cultivated agrobiodiversity helped ensure nutrient transfer and likelihood of gene flow. Farmers' field-level responses continued to include agrobiodiversity, especially multiple farmer varieties (FVs) of Andean maize. Capacities of social–ecological resilience in the period from 1990 to 2002 are estimated to have been moderate in anthropogenic canal woodlands (> 95 percent continued cover, albeit with reduced connectivity) and cultivated agrobiodiversity (viable with local loss of Andean potato FVs) and moderate-high in wild agrobiodiversity (viable with reduced capacity due to modified weed management). Indigenous “ethnodevelopment” applied to Andean community irrigation contributed positively to social–ecological resilience, albeit with significant limitations. Findings recommend that global change policies build emphasis on the interactions of water resource and agrobiodiversity management. 相似文献
370.
Qunying Huang Karl Benedict Abdelmounaam Rezgui Jibo Xie Jizhe Xia 《International journal of geographical information science》2013,27(4):765-784
Forecasting dust storms for large geographical areas with high resolution poses great challenges for scientific and computational research. Limitations of computing power and the scalability of parallel systems preclude an immediate solution to such challenges. This article reports our research on using adaptively coupled models to resolve the computational challenges and enable the computability of dust storm forecasting by dividing the large geographical domain into multiple subdomains based on spatiotemporal distributions of the dust storm. A dust storm model (Eta-8bin) performs a quick forecasting with low resolution (22 km) to identify potential hotspots with high dust concentration. A finer model, non-hydrostatic mesoscale model (NMM-dust) performs high-resolution (3 km) forecasting over the much smaller hotspots in parallel to reduce computational requirements and computing time. We also adopted spatiotemporal principles among computing resources and subdomains to optimize parallel systems and improve the performance of high-resolution NMM-dust model. This research enabled the computability of high-resolution, large-area dust storm forecasting using the adaptively coupled execution of the two models Eta-8bin and NMM-dust. 相似文献