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V. P. Kovach A. V. Ryazantsev A. A. Tretyakov K. E. Degtyarev E. V. Tolmacheva Kuo-Lun Wang A. B. Kotov Sun-Lin Chun Bor-Min Jahn 《Doklady Earth Sciences》2014,455(1):254-258
A typical feature of the Precambrian complexes of the Kokshetau, Ishkeolmess, Erementau-Niyaz, and Aktau-Dzhungaria massifs of Northern and Central Kazakhstan is the presence of the end Mesoproterozoic-beginning of the Neoproterozoic quartzite-schist sequences in these sections. The lower and upper parts of these sequences are mostly composed of schists with interlayers of quartzites and marbles and of quartzitic sandstones, respectively. It is suggested that the quartzite-schist sequences represent the sub-platform cover of a large continental block and were formed in the regressive basin with widely abundant facies of submarine deltas and a littoral shoal. The presence of horizons and the lenses enriched in zircon-rutile heavy concentrate with the amount of accessory minerals of 10-70% characterizes the quartzite-schist sections of the Kokshetau and Erementau-Niyaz massifs. The U-Pb age of zircons from one such locality in the central part of the Erementau-Niyaz massif was analyzed by LA-ICP-MS. The Concordia ages of zircons are in the intervals 1041 ± 13-1519 ± 14, 1623 ± 14-1931 ± 14, and 2691 ± 14-2746 ± 14 Ma. One age was 2850 ± 14 Ma. The age distribution is characterized by clear peaks of 1.08, 1.20. 1.34, 1.46, 1.65, 1.89, and 2.70 Ga and weak peaks of 1.13 and 1.68 Ga. The age of the majority of zircons ranges from 1309 ± 14 to 1519 ± 14 Ma. Our data indicate that mostly Neoproterozoic rocks with a subordinate role of Paleoproterozoic and Neoarchean complexes served the feeding sources for the quartzite-schist sequence of the Erementau-Niyaz massif. The Mesoproterozoic and Paleoproterozoic events identified for the detrital zircons of the Erementau-Niyaz massif are completely manifested only in Laurentia. In the first approximation, these events coincide with the assembly and breakup of the Columbia/Nuna supercontinent (~1650–1580 and 1450–1380 Ma) and assembly of the Rodinia supercontinent (1300–900 Ma). 相似文献
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Xilai Zheng Junjie Zhang Tianyuan Zheng Chun Liang Hongyu Wang 《Environmental Earth Sciences》2014,71(3):1349-1356
Water content is an important physical parameter for soil, vadose zone, and porous aquifer. Accurate measurement of water content in oil-contaminated porous media is critical for the research on oil pollution process and remediation in soil and groundwater systems. In this study, an improved water content calculation formula for oil-contaminated porous media was proposed based on the theory of oven-drying method, and laboratory experiments were conducted to test the applicability and accuracy of the formula for several types of manually prepared oil-contaminated porous media with different water contents. Furthermore, the measuring method and calculation formula, which can be used to determine the water content of porous media sampled from the oil-contaminated sites, were proposed for the first time in this study based on the improved formula. The experimental results showed that the improved formula was very accurate when used to calculate the water contents of diesel-contaminated sand, gasoline-contaminated mild clay, and engine oil-contaminated sand, indicating that it was widely applicable to oils with different volatile ability as well as porous media with different texture. This study meets the urgent need for accurate determination of water content in oil-contaminated porous media, and it solves the technical problem that the existing water content measuring methods cannot be applied directly in the field study. 相似文献
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航空磁法测量在地质矿产勘查领域有着广泛深入的应用,特别是寻找在与磁性矿物有关的金属矿床勘查中发挥着重要的作用。但是大飞机的航磁和地面人工磁测资料已难以满足矿产勘查工作的需求,为此,近几年国内迅速发展一种新型的磁法测量手段—低空高分辨磁法测量系统。这种系统以动力滑翔机、无人飞艇或无人飞机为飞行平台,集成了当前先进的磁测仪器及相关的软件技术,并多个地区开展了1∶1万高分辨率的低空磁法测量工作,取得了较好的方法运用效果,经对比分析,这种低空磁测资料可以替代传统地面磁法测量,快速而有效地开展高精度大面积的磁法测量,为矿产勘查提供一种先进的技术手段。 相似文献
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文章通过梳理在WOS(Web Of Science)核心数据集、谷歌学术、中国知网(CNKI)等平台筛选出的较高引用率、方法比较规范、与留守儿童主题相关性强的国内外文献159篇,从理论层面总结了儿童地理学研究的新转向:关注儿童与空间的关系,强调儿童在空间使用中的主体性,重视不同情境下儿童地理体验的差异性。并梳理了跨国迁移背景下留守儿童的3个研究主题:从空间视角探讨留守儿童的日常生活实践;从主体性出发探讨儿童在迁移链中的体验;在童年的差异性基础上讨论本土儿童的问题。同时从问题视角和积极视角分析了国内城乡迁移背景下留守儿童的研究主题,指出因现有研究范式中的经验主义和成人中心主义而存在的局限性。尝试勾勒出符合中国情境的留守儿童研究新范式,提出留守儿童的日常生活空间,留守儿童的能动性、异质性和多样性是国内留守儿童研究亟需关注的内容。呼吁学者采用历时和动态的研究设计,充分展现儿童如何理解、体验和应对复杂的流动背景下的日常生活。 相似文献
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