全文获取类型
收费全文 | 1069篇 |
免费 | 104篇 |
国内免费 | 105篇 |
专业分类
测绘学 | 39篇 |
大气科学 | 66篇 |
地球物理 | 231篇 |
地质学 | 453篇 |
海洋学 | 119篇 |
天文学 | 81篇 |
综合类 | 255篇 |
自然地理 | 34篇 |
出版年
2023年 | 37篇 |
2022年 | 23篇 |
2021年 | 38篇 |
2020年 | 48篇 |
2019年 | 27篇 |
2018年 | 10篇 |
2017年 | 4篇 |
2016年 | 7篇 |
2015年 | 6篇 |
2014年 | 9篇 |
2013年 | 6篇 |
2012年 | 4篇 |
2011年 | 5篇 |
2010年 | 5篇 |
2009年 | 14篇 |
2008年 | 9篇 |
2007年 | 32篇 |
2006年 | 32篇 |
2005年 | 29篇 |
2004年 | 92篇 |
2003年 | 66篇 |
2002年 | 85篇 |
2001年 | 87篇 |
2000年 | 273篇 |
1999年 | 104篇 |
1998年 | 19篇 |
1997年 | 15篇 |
1996年 | 48篇 |
1995年 | 28篇 |
1994年 | 39篇 |
1993年 | 5篇 |
1992年 | 5篇 |
1991年 | 5篇 |
1990年 | 11篇 |
1989年 | 6篇 |
1988年 | 7篇 |
1987年 | 9篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 7篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1979年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1963年 | 3篇 |
1961年 | 1篇 |
1957年 | 2篇 |
1954年 | 1篇 |
排序方式: 共有1278条查询结果,搜索用时 21 毫秒
51.
52.
1INTRODUCTIONIrrigated ricefieldsarecharacterizedbylargespatialandtemporalvariationsin CH4 emissiontotheatmo-sphere.Accordingly,thereisagreatuncertaintyintheestimate ofCH4 emissionsfromricefields.GreateffortshavebeenmadetoestimatetheCH4 emissionsfromricefieldsandseveralapproacheshavebeendeveloped.TherepresentativemethodsincludetheIPCC(Inter-governmentPanelofClimateChange)region-specificemissionfactormethodandthemodelcalculationmethod.Toimprovethecalculationaccuracy,theIPCCmethodreq… 相似文献
53.
Based on Hagget's theory of spatial structure,researches on the nodes and field of tourist origins to Huang-cheng Village in Shanxi Province of China have been explored.Nodal hierarchy structure of tourist origins is analyzed with cluster analysis and the gravity model.And field of tourist origins is analyzed with attraction radius index(R)and geography concentration index(G).In the field analysis,R and G of Huangcheng Village are compared with Xidi Village that is a world heritage located in Huangshan City of Anhui Province in China.According to comparison of loca-tions of two areas,influential factors for field area of Huangcheng Village are identified.It is concluded that:1)cluster analysis and gravity model can be complementary methods to each other for nodal hierarchy structure analysis of tour-ist origins;and 2)as far as location is concerned,the weak intensity effect of tourism resources in the tourist region is a major cause for explaining why tourist origins to Huangcheng Village are mainly its neighboring areas.Moreover,it is suggested that the regional effect of tourist resources should be regarded as a component of destination attractiveness when applying gravity model. 相似文献
54.
Impact of Human Activities on Depositional Process of Tidal Flat in Quanzhou Bay of China 总被引:2,自引:0,他引:2
WANG Aijun 《中国地理科学(英文版)》2007,17(3):265-269
As a very important component of a coastal system,tidal flats come to be a focus of the studies on land-ocean interaction in the coastal zone because those areas are subjected to intense human activities and are highly sensitive to the global change.The Quanzhou Bay,located along the middle part of Fujian coast of China,covers about 136.4km2,and the area of coastal wetland in the entire bay from intertidal to subtidal with 6m of water depth accounts for 96% of the total area.Seven short cores were collected and divided in situ with the interval of 5cm on the coastal wetlands of Quanzhou Bay on April 19,2006.The sediment samples were scattered and the grain sizes were measured by using Mastersizer 2000.Human beings' activities on tidal flat have disturbed the vertical distribution of sediments in stratigraphic sequence and accelerated the sedimentation rates.Grain size analysis results show that the grain size diameters increase and sediment becomes worse sorted towards the sea under the strong human disturbance;Spartina alterniflora can play a role of trapping the fine sediment;but near the bank,the sediment becomes coarse and there are two peak values on frequency curve influenced by the sandpile.The trough formed by human activities along the coastline changes the transport path of water and suspended sediment.The sediments are transported through the trough and deposit in it during the flood;the ebb flow is retarded by the flow output through the adjacent trough,and the deposited sediment can not be re-suspended;then,the sedimentation rate increases.In situ observation show that the sedimentation rate is about 8-10cm/yr. 相似文献
55.
56.
淡水对生命至关重要。如果没有淡水,人类平均只能存活3天。水是我们生产粮食的必需品,同时对我们几乎所有的产品和服务以及环境而言都不可或缺。当前,水短缺、洪水和干旱、清洁水供给不足等问题给世界带来的挑战日益严峻。因此,改进对水供给的预测、监测和管理迫在眉睫,水过多、过少和水污染问题亟需解决. 相似文献
58.
Two biodegradation models are developed torepresent natural attenuation of fuel-hydrocarbon contaminants as observed in a comprehensive natural-gradient tracer test in a heterogeneous aquifer on the Columbus Air Force Basein Mississippi,USA.The first, a first-order mass loss model,describes the irreversible losses of BTEX and its individual components, i.e.,benzene(B),toluene(T),ethyl benzene(E),and xylene(X).The second, a reactive pathway model,describe ssequential degradation pathways for BTEX utilizing multiple electron acceptors,including oxygen,nitrate,iron and sulfate,and via methanogenesis.The heterogeneous aquifer is represented by multiple hydraulic conductivity( K) zones delineated on the basis of numerous flowmeter K measurements.A direct propagation artificial neural network(DPN)is used as an inverse modeling tool to estimate the biodegradation rate constants associated with each of the K zones.In both the mass loss model and the reactive pathway model,the biodegradation rate constants show an increasing trend with the hydraulic conductivity.The finding of correlation between biodegradation kinetics and hydraulic conductivity distributions is of general interest and relevance to characterization and modeling of natural attenuation of hydrocarbons in other petroleum-product contaminated sites. 相似文献
59.
60.
作为中国地质学会最老的会员之一,我历来是把中国地质学会作为后盾和娘家.我是1952年清华大学地质系毕业后,由冯景兰老师介绍,当年加入中国地质学会成为会员的,到现在已经有70年了.我珍惜学会的荣誉,珍爱学会所有最有代表性的纪念品,保存有《地质学报》创刊号和早年的期刊.在中国地质学会与《地质学报》百年华诞之际,特献上我最真... 相似文献