全文获取类型
收费全文 | 6387篇 |
免费 | 1167篇 |
国内免费 | 1549篇 |
专业分类
测绘学 | 412篇 |
大气科学 | 1380篇 |
地球物理 | 1580篇 |
地质学 | 3110篇 |
海洋学 | 821篇 |
天文学 | 342篇 |
综合类 | 677篇 |
自然地理 | 781篇 |
出版年
2024年 | 35篇 |
2023年 | 140篇 |
2022年 | 318篇 |
2021年 | 363篇 |
2020年 | 286篇 |
2019年 | 290篇 |
2018年 | 374篇 |
2017年 | 305篇 |
2016年 | 367篇 |
2015年 | 317篇 |
2014年 | 393篇 |
2013年 | 373篇 |
2012年 | 344篇 |
2011年 | 340篇 |
2010年 | 364篇 |
2009年 | 342篇 |
2008年 | 331篇 |
2007年 | 298篇 |
2006年 | 228篇 |
2005年 | 180篇 |
2004年 | 173篇 |
2003年 | 151篇 |
2002年 | 171篇 |
2001年 | 162篇 |
2000年 | 164篇 |
1999年 | 281篇 |
1998年 | 296篇 |
1997年 | 262篇 |
1996年 | 260篇 |
1995年 | 201篇 |
1994年 | 186篇 |
1993年 | 144篇 |
1992年 | 116篇 |
1991年 | 96篇 |
1990年 | 99篇 |
1989年 | 75篇 |
1988年 | 58篇 |
1987年 | 56篇 |
1986年 | 45篇 |
1985年 | 27篇 |
1984年 | 19篇 |
1983年 | 11篇 |
1982年 | 16篇 |
1981年 | 13篇 |
1980年 | 12篇 |
1979年 | 6篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1938年 | 2篇 |
1936年 | 3篇 |
排序方式: 共有9103条查询结果,搜索用时 0 毫秒
991.
INTRODUCTIONAquiculturearearedtidesignalsoceanpollutionanddisaster.Althoughenvironmentscientistshaveconductedmanyin depthresearchesonthecauseandformationmechanismofredtide ,manyofitsaspectsarestillunknownbecauseredtideisacomplexphenomenonandtheecologic… 相似文献
992.
两系法杂交稻安全制种的水热传输模型及其应用 总被引:2,自引:0,他引:2
针对两系杂交稻制种易遇夏季低温危害制种纯度的技术瓶颈,为正确采用以水调温预防技术,本文依据热量平衡原理,建立了制种稻田的水热传输多层模型。经实测资料检验,模型稳定、可靠。对模型输入不同灌水参数的计算结果表明:20 cm气温(不育系敏感期的幼穗高度)随着净辐射通量、灌水深度、进水及出水口水温的升高而增加,增温幅度受这些因子的综合影响。要合理的利用水资源必须考虑多种因子的相互作用。对育性的实测表明,以水调温对防御夏季低温,提高制种纯度效果良好。 相似文献
993.
古尔班通古特沙漠是中国第二大沙漠,也是中国固定和半固定沙丘主要分布区,固沙灌木种较多。冠幅不仅是反映固沙灌木可视化的重要参数,也是反映沙漠植被生长情况的重要变量。以3种沙丘(固定沙丘、半固定沙丘和流动沙丘)上主要固沙灌木为研究对象,利用12种基础模型、BP(Backpropagation Neural Network)神经网络和支持向量机(Support Vector Machine,SVM)机器学习算法建立了基于固沙灌木株高和冠长率的冠幅预测模型,同时将两种机器学习算法拟合结果与基础模型进行比较,最终选出了适合研究区的冠幅预测模型。结果表明:(1)不同沙丘类型和不同灌木种类的最优冠幅预测模型不同,且固定沙丘和半固定沙丘模型优于流动沙丘。3种沙丘类型最优拟合为M2(Quadratic Model)模型;(2)白梭梭(Haloxylon persicum)在半固定沙丘和流动沙丘上拟合的最优模型分别为M2、M7(Gompertz),沙拐枣(Calligonum mongolicum)最优模型为M2,蛇麻黄(Ephedra distachya)和油蒿(Artemisia ordosica)在... 相似文献
994.
995.
用因子分析及方差最大原则下的正交旋转技术,计算并识别长江中下游汛期(5~9月)降水场的四个空间高载荷区及相对应的因子得分系数.它们的空间、时间变化,反映了长江中下游区域的实际降水特点.赤道东太平洋海温、区域平均海温及ENSO事件都与高载荷区的汛期降水有一定的联系,所得结果可作为汛期降水短期气候预报的参考因子. 相似文献
996.
This paper endeavours to put the discussion on errors and uncertainties in geographical information systems (GISs) in a more systematic way by examining the strength and weakness of discrete objects and continous fields, the two distinct schools of spatial data modelling. In doing so, it argues that neither discrete objects nor continous fields alone provide objective and complete representations of highly complex geographical phenomena, though there are good reasons for asserting that continuous fields are better suited to modelling spatial dependence, heterogeneity and fuzzines significant in geographical reality than discrete objects. Thus, there seems to be merit in adopting an integrated model incorporating analytical capabilities of fields and generalization functions of objects, for which extended TIN (triangulated irregular network) models along with their duals (Voronoi diagrams) provide a pragmatical solution. 相似文献
997.
Geochemistry of pore waters from the Xisha Trough, northern South China Sea and their implications for gas hydrates 总被引:2,自引:0,他引:2
Shao-Yong Jiang Tao Yang Lu Ge Jing-Hong Yang Hong-Fei Ling Neng-You Wu Jian Liu Dao-Hua Chen 《Journal of Oceanography》2008,64(3):459-470
This paper reports all available geochemical data on sediments and pore waters from the Xisha Trough on the northern continental
margin of the South China Sea. The methane concentrations in marine sediments display a downhole increasing trend and their
carbon isotopic compositions (δ
13C = −25 to −51‰) indicate a thermogenic origin. Pore water Cl− concentrations show a range from 537 to 730 mM, and the high Cl− samples also have higher concentrations of Br−, Na+, K+, and Mg2+, implying mixing between normal seawater and brine in the basin. The SO4
2− concentrations of pore waters vary from 19.9 to 36.8 mM, and show a downhole decreasing trend. Calculated SMI (sulfate-methane
interfaces) depths and sulfate gradients are between 21 and 47 mbsf, and between −0.7 and −1.7 mM/m, respectively, which are
similar to values in gas hydrate locations worldwide and suggest a high methane flux in the basin. Overall, the geochemical
data, together with geological and geophysical evidence, such as the high sedimentation rates, high organic carbon contents,
thick sediment piles, salt and mud diapirs, active faulting, abundant thermogenic gases, and occurrence of huge bottom simulating
reflector (BSR), are suggestive of a favorable condition for occurrence of gas hydrates in this region. 相似文献
998.
999.
The development of modern agriculture has resulted in much homogenization of the landscape consisting of large patches of farmland,so small remnant non-crop habitats especially linear corridors play an important role in the conservation of species and the maintenance of ecosystem functions.However,little attention has been paid to the effects of corridors structural characteristics on the plant species restricted to such habitats.In this study,we selected three types of corridors including ditch,hedgerow and road,and ana-lyzed their structural characteristics.The plant species presented in these corridors were investigated,and the species diversity,abun-dance and frequency were estimated.Moreover,spatial arrangements of corridors were classified into different types to discuss whether there were significant effects of corridor network on plant distribution.The results show that three types of corridors have different ef-fects on plant species composition and diversity.The one-one combined corridor networks and total network associated by three corri-dors have more complex structural features than each single type of corridor.However,there is no strong correlation between the corri-dor networks with their plant species.We suggest that carrying out a pointed vegetation survey at corridor intersections to further test the relationships between structural features of corridor and plants is necessary. 相似文献
1000.
利用2010年8月采集的南京北郊气溶胶样品,使用GC-MS对美国环保总局推荐的16种优先控制的多环芳烃含量、分布特征进行了研究。在此基础上,用特征比值法、主因子分析法分析得到南京市北郊大气中PAHs的主要来源为车辆尾气、燃煤、天然气和草木秸秆燃烧,并应用绝对因子分析法进一步定量计算主要源对PAHs的浓度贡献率。结果表明:1)大气颗粒物中16种多环芳烃的平均总质量浓度为135.85 ng/m~3,多环芳烃以4环为主,在可吸入颗粒物中的浓度占总浓度的88.7%;2)PM10中多环芳烃呈双模态分布,在9~10μm的粗模态和0.65~1.10μm的积聚模态上各出现一个峰值;3)天然气等对PAHs的贡献率为5.7%~44.1%,燃煤源的贡献率为20.7%~57.8%,汽车尾气的贡献率为4.6%~46.7%,木材燃烧的贡献率为2.9%~38.1%。本地交通排放和燃料燃烧是南京北郊大气颗粒物中PAHs的主要来源,远距离输送也对南京北郊气溶胶中的PAHs有重要贡献。 相似文献