全文获取类型
收费全文 | 523篇 |
免费 | 81篇 |
国内免费 | 93篇 |
专业分类
测绘学 | 126篇 |
大气科学 | 27篇 |
地球物理 | 120篇 |
地质学 | 216篇 |
海洋学 | 56篇 |
天文学 | 28篇 |
综合类 | 38篇 |
自然地理 | 86篇 |
出版年
2024年 | 2篇 |
2023年 | 14篇 |
2022年 | 22篇 |
2021年 | 31篇 |
2020年 | 24篇 |
2019年 | 20篇 |
2018年 | 23篇 |
2017年 | 22篇 |
2016年 | 30篇 |
2015年 | 33篇 |
2014年 | 22篇 |
2013年 | 42篇 |
2012年 | 38篇 |
2011年 | 36篇 |
2010年 | 20篇 |
2009年 | 21篇 |
2008年 | 29篇 |
2007年 | 37篇 |
2006年 | 22篇 |
2005年 | 24篇 |
2004年 | 20篇 |
2003年 | 19篇 |
2002年 | 23篇 |
2001年 | 33篇 |
2000年 | 14篇 |
1999年 | 13篇 |
1998年 | 9篇 |
1997年 | 13篇 |
1996年 | 2篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1993年 | 7篇 |
1992年 | 4篇 |
1991年 | 5篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
排序方式: 共有697条查询结果,搜索用时 31 毫秒
51.
依赖于地下水的生态系统广泛分布,潜水含水层本身是个生态系统,地下水不仅维持许多水生生态系统,而且是干旱-半干旱地区陆生植被生存的重要水源。研究地下水与植被的相互联系是生态水文地质学的主要组成部分,重点介绍地下水-植被系统的研究方法。植被吸收的地下水量占总蒸腾量的比例是评价植被依赖地下水程度的一个定量指标,蒸腾量比例呈季节性与区域性变化,取决于植被类型、地下水位埋深与动态变化、土壤岩性与气候条件。植被总蒸腾量可以用涡流相关系统测量。地下水的蒸腾量可以用植物茎流计测量,或者用地下水位昼夜变化估算。用同位素混合模型也能估算地下水占总蒸腾量的比例。植被对地下水位下降的响应可能有两种形式,一种是线性比例响应,另一种是临界突变响应,只有通过长期系统观测植被长势与地下水位的变化才能利用统计分析建立两者响应关系。目前,植被-水文模型只能模拟植被冠层截流与蒸腾对土壤水与地下水的影响,或者模拟土壤水-地下水对植被生长的影响,地下水与植被相互作用与反馈的耦合模型还是个空白。 相似文献
52.
Shengyi Mao Guodong Jia Xiaowei Zhu Nengyou Wu Daidai Wu Hongxiang Guan Lihua Liu 《海洋学报(英文版)》2022,41(8):22-30
Long-chain n-alkanols and n-alkanes in core sediments from the northern South China Sea (SCS) were measured to make a comparison during terrestrial vegetation reconstruction from ~42 ka to ~7 ka. The results showed that terrestrial vegetation record from long-chain n-alkanes matched well with previous studies in nearby cores, showing that more C4 plants developed during the Last Glacial Maximum (LGM) and C3 plants dominated in the interglacial period. However, these scenarios were not revealed by terrestrial vegetation reconstruction using long-chain n-alkanols, which showed C3 plant expansion during the LGM. The discrepancy during the interglacial period could be attributed to the aerobic degradation of functionalized long-chain n-alkanols in the oxygen-rich bottom water, resulting in poor preservation of terrestrial vegetation signals. On the other hand, the different advantages of functionalized n-alkanols and non-functional n-alkanes to record local and distal vegetation signals, respectively, may offer a potential explanation for the contradiction during the LGM when the SCS was characterized by low-oxygen deep water. Nevertheless, large variations on n-alkyl lipid compositions in C3/C4 plants could play a part in modulating sedimentary long-chain n-alkanols and n-alkanes toward different vegetation signals, thereby suggesting that caution must be taken in respect to the terrestrial vegetation reconstruction using long-chain n-alkanes and long-chain n-alkanols. 相似文献
53.
54.
Peter HUDSON 《《地质学报》英文版》2014,88(Z1):73-73
正Lakes Acraman,Gairdner,Harris and Everard are a cluster of large episodic salt lakes on Eyre Peninsula,South Australia.These lakes have a characteristic terrestrial invertebrate fauna including various spiders, 相似文献
55.
Mikhail Batygov 《Earth, Moon, and Planets》2006,99(1-4):183-192
The possibility of terrestrial antineutrino directionality studies is considered for future unloaded liquid scintillator detectors.
Monte-Carlo simulations suggest that the measurable displacement between prompt and delayed antineutrino signals makes such
studies possible. However, it is estimated that on the order of 1000 terrestrial antineutrino events are required to test
the simplest models, demanding detectors of 100 kt size to collect sufficient data in a reasonable period of time. 相似文献
56.
The author puts forward the proposal in this paper that all the terrestrial planets (Venus, the Earth, and Mars) as well as
the Moon deviate from hydrostatic equilibrium to some degree. The Earth's level of deviation of these four celestial bodies
is minimum, and that of Mars is maximum. Moreover, the author estimates Martian nonhydrostatic components of the principal
moments-of-inertia using five models for the interior of Mars. Comparison with other terrestrial planets shows that setting
the range of mean moment-of-inertia ratio, I/MR2, in 0.345 ~ 0.355for Mars is reasonable.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
57.
Shallow-delta sedimentary systems receive both terrestrial and marine organic matter. As oil and gas exploration activities determine that the source rocks of the deep-water area of the Qiongdongnan Basin, northern South China Sea, are generally rich in and even dominated by terrestrial organic matter, this has led many researchers to examine the rules governing terrestrial organic matter enrichment in shallow-delta sea sedimentary systems. However, the deep burial of source rocks in deep-water areas and the relatively small amount of drilling undertaken have greatly restricted the study of these rules. In this study, the ‘forward modeling’ research method was used to observe and analyze the deposition and preservation of terrestrial organic matter through flume experiments, where the depositional results were carefully depicted and sampled. The total organic carbon content of selected samples was measured and when combined with qualitative observations and quantitative comparison results, the dominant enrichment areas of terrestrial organic matter were identified. The experimental results show that the overbank parts of the delta front, the dune countercurrent surface, the low-lying parts, the delta front slope area and the shallow-prodelta sea area are where terrestrial organic matter is predominantly enriched. This provides an important basis and guidance for the prediction of the development areas of marine source rocks with terrestrial input in the deep-water areas of the Qiongdongnan Basin. 相似文献
58.
针对地面LiDAR点云配准中不同坐标系点云数据存在对应的平面特征不同的问题,文章提出了一种基于总体最小二乘的地面LiDAR点云数据配准算法:通过对分割后的点云数据平面拟合,得到相应法向量;根据不同坐标系中LiDAR点云数据对应的平面法向量,利用反对称矩阵和罗德里格矩阵的性质,用3个独立参数代替3个旋转参数,采用总体最小二乘法建立旋转矩阵解算模型;采用总体最小二乘法确定平移参数的计算公式;最后根据转换后特征点云与对应平面点云的重复情况,给出了配准模型的精度公式。实验结果表明该方法精度较高,可以取得较好的点云配准效果,适合于含有大量重复平面特征的点云数据的配准。 相似文献
59.
陈源恺 《测绘与空间地理信息》2015,(11)
地面固定式激光扫描系统能够获取大面积高分辨率的被测对象表面三维数据,本研究通过对固定式LiDAR激光数据做初分类,从地面点中粗提取具有少量噪声的建筑墙面数据,然后利用平面区域分割算法和立面约束条件提取建筑物墙面数据。在对两份固定式三维激光扫描点云的实验中,通过对不同分辨率的数据利用本文所提算法都取得了较好的墙面提取效果,实验证明了该方法的有效性。 相似文献
60.
基于小波的浙江省NDVI与自然—人文因子多尺度空间关联分析 总被引:1,自引:0,他引:1
对地表植被的空间分布格局及其与自然、人文因子间的关系开展综合的、多尺度的定量分析,这是全球气候变化背景下土地利用与覆被研究中的一项重要内容。以地处亚热带湿润季风区的浙江省为研究区,设置了东西向(样线A)和北南向(样线B)两条样线,并应用小波分析方法对研究区NDVI、高程、坡度和土地利用强度等因子的尺度特征以及这些因子间的多尺度相关关系进行了分析。结果表明:1研究区内,NDVI、高程、坡度及土地利用强度的空间分布格局存在四个尺度域;2上述因子在样线A及样线B上的空间分布分别存在两个主要特征尺度,其中东西向(样线A)上的特征尺度为40 km和80 km,北南向(样线B)上主要的特征尺度为30 km和50 km;3在较大尺度域(8 km以上),土地利用强度是影响NDVI空间分布的最主要因素,而在小尺度域(0~8 km),坡度和高程因子成为影响NDVI分布的主要因子。研究还认为,小波分析方法为识别地理要素空间分布的特征尺度、量测要素间任意尺度、任意位置上的相干关系,提供了方便的工具。 相似文献