全文获取类型
收费全文 | 362篇 |
免费 | 72篇 |
国内免费 | 60篇 |
专业分类
测绘学 | 16篇 |
大气科学 | 5篇 |
地球物理 | 47篇 |
地质学 | 323篇 |
海洋学 | 31篇 |
天文学 | 3篇 |
综合类 | 34篇 |
自然地理 | 35篇 |
出版年
2023年 | 1篇 |
2022年 | 12篇 |
2021年 | 12篇 |
2020年 | 8篇 |
2019年 | 16篇 |
2018年 | 8篇 |
2017年 | 14篇 |
2016年 | 19篇 |
2015年 | 14篇 |
2014年 | 22篇 |
2013年 | 19篇 |
2012年 | 18篇 |
2011年 | 14篇 |
2010年 | 14篇 |
2009年 | 25篇 |
2008年 | 23篇 |
2007年 | 23篇 |
2006年 | 25篇 |
2005年 | 17篇 |
2004年 | 24篇 |
2003年 | 12篇 |
2002年 | 18篇 |
2001年 | 25篇 |
2000年 | 20篇 |
1999年 | 21篇 |
1998年 | 11篇 |
1997年 | 4篇 |
1996年 | 17篇 |
1995年 | 7篇 |
1994年 | 7篇 |
1993年 | 7篇 |
1992年 | 4篇 |
1991年 | 5篇 |
1990年 | 1篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1983年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有494条查询结果,搜索用时 15 毫秒
71.
地勘单位强化财务管理的几点经验 总被引:1,自引:0,他引:1
面对新形势新任务,山东地勘单位强化项目资金管理和风险意识,在工作中注重细节,合理纳税筹划,正确处理国家、单位及职工的利益关系,确保地勘单位经济健康运行,取得了较好的经济效益。 相似文献
72.
松辽盆地三肇地区扶杨油层油气成藏过程主控因素及成藏模式 总被引:4,自引:0,他引:4
从多元地质条件及其时空匹配关系的角度出发,对三肇地区扶杨油层油气成藏过程中的主控因素进行分析。结果表明:上覆青山口组一段源岩有效排烃范围、超压和T2反射层油源断裂组合关系控制了油气垂向向下“倒灌”的运移范围、距离及层位;古构造背景、T2断层与储层砂体配置关系控制着油气侧向运移的方向、通道和距离;基准面旋回、沉积微相类型与现今构造配置关系控制着油气的垂向聚集层位及平面分布规律。在此基础上,结合构造发育史、油源条件及沉积微相研究成果,对研究区扶杨油层油气成藏模式进行了总结,认为研究区扶杨油层主要存在4种成藏模式:源内--顶生下储式油气成藏模式、近源--短距离侧向运移--斜坡带断层遮挡油气成藏模式、源外--长距离侧向运移--继承性构造隆起带油气成藏模式、多源--多方式侧向运移油气成藏模式。 相似文献
73.
Wenwu Tang Wenpeng Feng Meijuan Jia 《International journal of geographical information science》2013,27(3):412-439
This study presents a massively parallel spatial computing approach that uses general-purpose graphics processing units (GPUs) to accelerate Ripley’s K function for univariate spatial point pattern analysis. Ripley’s K function is a representative spatial point pattern analysis approach that allows for quantitatively evaluating the spatial dispersion characteristics of point patterns. However, considerable computation is often required when analyzing large spatial data using Ripley’s K function. In this study, we developed a massively parallel approach of Ripley’s K function for accelerating spatial point pattern analysis. GPUs serve as a massively parallel platform that is built on many-core architecture for speeding up Ripley’s K function. Variable-grained domain decomposition and thread-level synchronization based on shared memory are parallel strategies designed to exploit concurrency in the spatial algorithm of Ripley’s K function for efficient parallelization. Experimental results demonstrate that substantial acceleration is obtained for Ripley’s K function parallelized within GPU environments. 相似文献
74.
Quantitative measures of the relationships between channel morphology and the habitat use of Chinese sturgeon(Acipenser sinensis) can help management and regulatory agencies to quantify potential spawning habitats and develop recovery goals in view of the decreasing area of sturgeon spawning habitat.This study determined the specific bedform types at the pool-riffle scale and evaluated the slopes,aspects and bed load gradation composition of Chinese sturgeon spawning areas in the Yangtze River,China.A bedform differencing technique was used to objectively quantify the longitudinal riverbed profile into four distinct pool-riffle units that were independent of discharge.The vertical location of thalweg points within these units was quantified with a riffle proximity index.Chinese sturgeon spawning areas were mapped and correlated with the pool-riffle units,slopes and aspects.The results indicate that Chinese sturgeon spawning areas occur primarily in riffles.The majority of Chinese sturgeon spawning occurred at elevations greater than 75%of the difference in elevation between the nearest riffle crest and the pool bottom.The slope of spawning sites was distributed between 0.05 and 6.36,and the average aspects were 219.92 and 207.63,respectively.The bed load is mainly composted of gravel and pebble,sediment diameter concentrated on 50-500mm.These analyses of bedform morphology will assist regional fish managers in quantifying existing and potential Chinese sturgeon spawning habitats and will provide a quantitative framework for evaluating general ecological implications of channel morphology in the Yangtze River. 相似文献
75.
76.
Detachment of the sliver-like Cimmerian terrane from eastern Gondwana in the Early Permian triggered mafic volcanism in many parts of the rift zone. To understand this tectonic episode we have carried out paleomagnetic investigations on mafic volcanic for-mations that were erupted on key terranes that now form part of Tibet. Specifically, we will present data from sections near Lhasa City (central Lhasa block) and Tuotuohe (central Qiangtang Block) as well as near Gyanyima (Paleotethyan sea-mount) that was emplaced onto the floor of Palaeotethys during the Late Permian. Paleomagnetic plots from each location will be used for tectonic calculations. Our new data will be used to evaluate regional scale models con-cerned with how the Cimmerian terranes in southern and SE Asia (from Iran-Tibet-SW China-Myanmar- Thailand-Sumatra) formerly abutted eastern Gond-wana. 相似文献
77.
Rong Xiao Junhong Bai Qinggai Wang Haifeng Gao Laibin Huang Xinhui Liu 《洁净——土壤、空气、水》2011,39(7):612-618
Surface soils were collected in the aquatic–terrestrial ecotone (ATE) of Yongnianwa wetland, downstream of Haihe River basin of North China in June of 2007. Samples were subjected to a total digestion technique before they were analyzed for total concentrations of Cr, Cu, Ni, Pb, and Zn to investigate their pollution levels in the ATE. The contamination index, integrated contamination index, geoaccumulation index, toxic units, and sum of toxic units were adopted to assess the heavy metal contamination levels and ecotoxicity, respectively. The results showed all the selected element concentrations in upland soils of the ecotone were relatively higher than those in the lowland soils. No Cr pollution was observed in all soil samples, but almost all samples were slightly polluted by Cu, Ni, Pb, and Zn except for Site 1. The contamination indexes and geoaccumulation indexes consistently presented no contamination for Site 1 and slight contamination for other sites. The ΣTUs increased from lowland to upland, but the whole level of toxicity in this ecotone was relatively low. 相似文献
78.
79.
80.