全文获取类型
收费全文 | 6647篇 |
免费 | 1201篇 |
国内免费 | 1897篇 |
专业分类
测绘学 | 894篇 |
大气科学 | 1216篇 |
地球物理 | 1423篇 |
地质学 | 3282篇 |
海洋学 | 1185篇 |
天文学 | 179篇 |
综合类 | 573篇 |
自然地理 | 993篇 |
出版年
2024年 | 25篇 |
2023年 | 104篇 |
2022年 | 222篇 |
2021年 | 301篇 |
2020年 | 202篇 |
2019年 | 306篇 |
2018年 | 327篇 |
2017年 | 281篇 |
2016年 | 369篇 |
2015年 | 347篇 |
2014年 | 380篇 |
2013年 | 420篇 |
2012年 | 499篇 |
2011年 | 484篇 |
2010年 | 465篇 |
2009年 | 464篇 |
2008年 | 447篇 |
2007年 | 489篇 |
2006年 | 407篇 |
2005年 | 422篇 |
2004年 | 351篇 |
2003年 | 285篇 |
2002年 | 426篇 |
2001年 | 363篇 |
2000年 | 280篇 |
1999年 | 238篇 |
1998年 | 128篇 |
1997年 | 116篇 |
1996年 | 87篇 |
1995年 | 98篇 |
1994年 | 85篇 |
1993年 | 49篇 |
1992年 | 50篇 |
1991年 | 42篇 |
1990年 | 36篇 |
1989年 | 24篇 |
1988年 | 25篇 |
1987年 | 23篇 |
1986年 | 12篇 |
1985年 | 8篇 |
1984年 | 13篇 |
1983年 | 5篇 |
1982年 | 8篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1972年 | 2篇 |
1971年 | 3篇 |
1957年 | 4篇 |
1954年 | 2篇 |
1933年 | 3篇 |
排序方式: 共有9745条查询结果,搜索用时 359 毫秒
81.
山东沿海旅游业可持续发展对策研究 总被引:4,自引:1,他引:4
滨海旅游是旅游活动的重要组成部分 ,在我国具有广阔的发展潜力。在讨论了山东沿海旅游业发展中存在的问题的基础上 ,指出发展滨海旅游与滨海和海洋环境之间的相关关系 ,探讨了使山东沿海旅游业可持续发展的主要对策 相似文献
82.
南海鱼类生物多样性与区系分布 总被引:7,自引:0,他引:7
分析了南海鱼类生物多样性与区系分布的生态地理条件,鱼类生物多样性特征。校核整理了南海鱼类2 321种,分属于六鳃鲨等35目,以鲈形目占绝对优势(979种),并以珊瑚礁栖,典型暖水种的隆头鱼科为优势科(占117种),而蝴蝶鱼和石斑鱼分别达到34种、31种,列为优势属,从而构成南海富有潜势的群落结构。文中进一步论述了南海鱼类区系属于以印度-西太平洋为主体的区系特征。 相似文献
83.
上新世——早更新世青藏高原北缘隆升的磁性地层学证据 总被引:9,自引:0,他引:9
对新疆叶城剖面西域砾岩及下伏第三纪地层的磁性地层学研究表明 ,西域砾岩的沉积时代为晚上新世至早更新世 ,磁性地层年龄为 3.5至 <1.8Ma。阿图什组沉积于早上新世 ,古地磁年龄为 4 .6~ 3.5 Ma。阿图什组以砂岩和粉砂岩为主夹薄层砾岩 ,为河流相及冲积扇前缘相。西域砾岩以厚层砾岩为主夹风成粉砂岩 ,为典型洪积—冲积扇堆积。西域砾岩的沉积反映了青藏高原北缘晚上新世至早更新世强烈的隆起和剥蚀 相似文献
84.
Floating tephra was deposited together with ice core,snow layer,abyssal sediment,lake sediments,and other geological records.It is of great significance to interpret the impact on the climate change of volcanic eruptions from these geological records.It is the first time that volcanic glass was discovered from the peat of Jinchuan(金川)Maar,Jilin(吉林)Province,China.And it is in situ sediments from a near-source explosive eruption according to particle size analysis and identification results.The tephra were neither from Tianchi(天池)volcano eruptions,Changbai(长白)Mountain,nor from Jinlongdingzi(金龙顶子)volcano about 1 600 aBP eruption,but maybe from an unknown eruption of Longgang(龙岗)volcano group according to their geochemistry and distribution.Geochemical characters of the tephra are similar to those of Jingiongdingzi,which are poor in s.Jica,deficient in alkali,Na20 content is more than K20 content,and are similar to distribution patterns of REE and incompatible elements,which helps to speculate that they originated from the same mantle magma with rare condemnation,and from basaltic explosive eruption of Longgang volcano group.The tephra,from peat with age proved that the eruption possibly happened in 15 BC-26 AD,is one of Longgang volcano group eruption that was not recorded and is earlier than that of Jinglongdingzi about 1 600 aBP eruption.And the sedimentary time of tephra is during the period of low temperature alteration.which may be the influence of eruption toward the local climate according to the correlativity of eruption to local temperature curve of peat cellulose oxygen isotope. 相似文献
85.
元胞自动机城市增长模型的空间尺度特征分析 总被引:4,自引:2,他引:2
基于元胞自动机模拟城市系统的复杂行为时,空间尺度是一个非常重要的概念,模型的模拟结果往往会随着输入数据的空间尺度变化而发生变化。然而,目前的元胞自动机城市增长模型大多没考虑数据的空间尺度特征,本文拟通过改变模型中输入数据的空间尺度来验证元胞自动机城市增长模型对尺度的敏感性及其空间尺度特征,并以长沙市为例进行实证研究。研究结果表明:元胞自动机城市增长模型只有在一定的尺度范围内才具有较高的模拟精度,并且模型对尺度具有一定的敏感性,因此为了使模型能够具有较高的模拟精度,并较好地反映城市形态特征,应认真选择模型中输入数据的空间尺度。 相似文献
86.
87.
88.
小波的SAR和光学图像融合方法比较研究 总被引:1,自引:1,他引:0
本文通过光学图像和SAR图像的融合,对几种典型的小波融合方法进行了分析对比实验,并使用各种评价标准对它们的融合效果给出了评价。在此基础上,对光学图像和SAR图像融合效果的各种评价标准做出了讨论并提出自己的看法。 相似文献
89.
LIU Luofu HUO Hong GUO Yongqiang CHEN Lixin LI Shuangwen ZHAO Yande LI Yan WANG Ping CHEN Zhijun 《中国地球化学学报》2008,27(1):1-8
The results presented in this paper indicated that the carbazole-type compounds have high thermal stability and also show stability in oxidation and bio-degradation. This kind of compounds still has high concentrations and a complete distribution in the analyzed dry asphalt samples, showing that they are particularly useful in the study of hydrocarbon migration of the paleo-pools. The difference in the contents of nitrogen compounds in the Silurian dry asphalts from the Awati, Tabei and Tazhong areas is attributed to the difference in the extent of oxidation and (or) bio-degradation for the areas; the Awati and Tabei areas underwent relatively strong oxidation and bio-degradation. During the first stage of hydrocarbon pool formation in the Silurian system in the Tazhong and Tabei areas of the Tarim Basin (at the end of the Silurian period) and at the second stage in the Awati area (in Permian), the hydrocarbons experienced a long-distance migration. 相似文献
90.
Petroleum Migration Direction of the Silurian Paleo-pools in the Tarim Basin, Northwest China 总被引:1,自引:0,他引:1
LIU Luofu ZHAO Ye HUO Hong CHEN Lixin CHEN Yuanzhuang ZHAO Suping LI Chao LI Shuangwen GUO Yongqiang LI Yan 《《地质学报》英文版》2008,82(1):174-183
The results obtained in this paper indicate that carbazole-type compounds have high thermal stability and also show stability in oxidation and bio-degradation. This kind of compounds still has a high concentration and complete distribution in the analyzed dry asphalt samples, showing that they are particularly useful in studying petroleum migration of paleo-pool. During the basin's first-stage of oil-gas pool formation in the Silurian in Tazhong and Tabei areas of Tarim Basin (at the end of Silurian period) and the second-stage in the Awati area (in Permian), the petroleum experienced a long-distance migration. During the formation of the Silurian paleo-pools in Tazhong Uplift at the end of Silurian, the petroleum mainly came from the lower and middle Cambrian source rocks in the Manjiaer sag. The petroleum migrated towards the southwest-south entering the Silurian reservoir beds in Tazhong first. Then, it further migrated within Silurian from northwest to southeast along the highs of the Structural Belts to the region of the Silurian pinchout boundary in Tazhong. In Tabei Uplift, during the first-stage of pool formation, the petroleum was also from the lower and middle Cambrian source rocks in the Manjiaer sag. It migrated northwest entering the Silurian reservoir beds in the Tabei Uplift firstly, and then the migration continued in the same direction within the Silurian reservoirs and finally the petroleum was trapped in higher positions. During the second-stage pool formation in the Silurian beds in the areas around Awati sag, the petroleum mainly came from the lower-middle Cambrian source rocks in the Awati sag. The petroleum migrated from the generation center to Silurian reservoirs in all directions around the sag through major paths, and the petroleum was finally trapped in higher locations. 相似文献