全文获取类型
收费全文 | 1223篇 |
免费 | 117篇 |
国内免费 | 97篇 |
专业分类
测绘学 | 79篇 |
大气科学 | 69篇 |
地球物理 | 235篇 |
地质学 | 448篇 |
海洋学 | 175篇 |
天文学 | 113篇 |
综合类 | 280篇 |
自然地理 | 38篇 |
出版年
2024年 | 5篇 |
2023年 | 47篇 |
2022年 | 19篇 |
2021年 | 38篇 |
2020年 | 62篇 |
2019年 | 146篇 |
2018年 | 15篇 |
2017年 | 9篇 |
2016年 | 9篇 |
2015年 | 6篇 |
2014年 | 11篇 |
2013年 | 5篇 |
2012年 | 3篇 |
2011年 | 10篇 |
2010年 | 8篇 |
2009年 | 13篇 |
2008年 | 10篇 |
2007年 | 31篇 |
2006年 | 28篇 |
2005年 | 29篇 |
2004年 | 89篇 |
2003年 | 66篇 |
2002年 | 84篇 |
2001年 | 88篇 |
2000年 | 274篇 |
1999年 | 104篇 |
1998年 | 19篇 |
1997年 | 15篇 |
1996年 | 48篇 |
1995年 | 29篇 |
1994年 | 40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 |
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1437条查询结果,搜索用时 15 毫秒
911.
MOTIVATION OF CHINESE INVESTMENT IN VIETNAM 总被引:1,自引:0,他引:1
REN Yi 《中国地理科学(英文版)》2006,16(1):41-47
1INTRODUCTIONIn January 2003, the London Based Financial Times re- ported that China attracted a record of US$52.7×109 in foreign direct investment (FDI) in the year 2002, sur- passing the United States to become the world's largest FDIrecipient. From zero in 1978 to over US$52×109 in 2002, the compound rate of growth of FDI in China has been nearly 40% per year. This growth helped China achieve a remarkably high average growth rate of GDP of nearly 10% per annum from 1978 to … 相似文献
912.
FUZZY SYNTHETIC EVALUATION ON RESIDENT''''S PERCEPTIONS OF TOURISM IMPACTS——Case of Jiuzhaigou National Park, Sichuan Province, China 总被引:2,自引:2,他引:0
1INTRODUCTIONCommunity residents form an important part of tourismdestinations and play a crucial role in the protection anddevelopment oftourism resources. The Tourism Agenda21 advocates that the development of tourism industryshouldconsider the interestsofthe host residentsand en-sure long-term viability beneficial towards destinationcommunity (LIU, 2000). Yet in manyinstances tourismdevelopment proves detrimental to host communities(LANKFORD and HOWARD, 1994; LIU and VAR,1986)… 相似文献
913.
CHENG Shu-lan OUYANG Hua NIU Hai-shan WANG Lin ZHANG Feng GAO Jun-qin TIAN Yu-qiang 《中国地理科学(英文版)》2004,(3)
1INTRODUCTIONDesertification is one of the most serious land degrada-tion, which results in the deterioration of physical, che-mical, and biological characteristics of soils (UNEP, 1992). Soil organic carbon (SOC) was considered to be a key index in evaluation of soil quality, soil degradation and soil C sequestration(SCHLENGSINGER etal., 1990; FENG etal., 2002; WANG etal., 2003). Many researchers have reported the correlations among desertification restoration, soil C s… 相似文献
914.
JIANG Qigang 《东北亚地学研究》2002,(2)
1IntroductionLanduseandcoverchanges (LUCC)andaccompa niedenvironmentalchangessuchassoildegradationbe camemoreandmoreseriousinrecentdecades .There foremanyresearchesinChinaandabroadareengagedinLUCCandsoildegradationstudy ,suchasWuChuan jun,etc .(1994 ) ,FengZhimi… 相似文献
915.
LI Xiao-jian 《中国地理科学(英文版)》2001,11(2):120-128
1 INTRODUCTIONChina′s reform and open policies commenced in 1978 have developed international economic linkages and brought the country on the track toward economic globalization. Large amount of foreign direct investment (FDI) has flown to China and China has become the second or third largest FDI recipient since 1993 (UNCTAD, 1996; 1999). The annual increase in foreign trade has doubled the GDP growth rates. The globalization process has been accelerated since the mid-1990s as… 相似文献
916.
1 IntroductionBysummarizingandcomparingthecharacteris ticsofdeformationobservedbeforeandafterearth quakes,wehavediscoveredthatcertainContinuousRapidDeformation (CRD)maybeobservedatsometilt meterandextensometersites.Duringashortperiodbeforeanearthquake,acontinuousrapiddeformationwithadurationfromhalfmonthtohalfyearoftenoccurred .Thecontinu ousrapiddeformationofthegroundismostlikelyrelatedtotheearthquakepreparationprocess,per hapsshowingarapidlocalstressadjustmentpriortotheearthquake.Therapi… 相似文献
917.
Population, seasonal abundance of the mysid Indomysis annandalei Tattersal (1914) from Karachi wat-ers (northern Arabian Sea) are studied. Occurrence of breeding females is noted and developmental stagesare described. 相似文献
918.
1 INTRODUCTIONMore arable land is needed to meet the continuous increase of population, at the same time, with the rapid development of economy in China, more and more arable land were occupied for the construction of transportation, industry and settlement. Increasing arable land by reclaiming and cultivating unused land and forestland or filling up lakes give rise to environmental deterioration, ecological disturbance and want of natural resources. In order to balance the various kind… 相似文献
919.
E. N. Parker 《中国天文和天体物理学报》2001,1(2):99-124
1 INTRODUCTION
The Sun is close enough to observe in some detail, and it shows that a star is more than
the traditional stable self-gravitating thermonuclear body established half a celltury ago. For
the fact is that out of sight beneath the visible surface the outward flow of heat from the
thermonuclear core drives hydrodynamics that generates magnetic fields. It is the complicated
dynamics of those magnetic fields that produces the modern mysteries of the active Sun. The… 相似文献
920.
The Pearl River Delta (PRD) has been the mostdynamic region of China in the 1980s. The gross outputvalue of industry and agriculture, gross output value ofindustry, total amount of retail sales of consumer goodsand government revenue are chosen to examine the economic growth of the PRD. From 1980 to 1991, theabove-mentioned .four indicators increased at annualaverage rate of 23. 92%, 25. 16%, 20. 05% and16. 32% respectively, being 7. 86, 8. 43, 5. 63 and4. 77 percent points above that of t… 相似文献