全文获取类型
收费全文 | 4299篇 |
免费 | 805篇 |
国内免费 | 1238篇 |
专业分类
测绘学 | 330篇 |
大气科学 | 815篇 |
地球物理 | 767篇 |
地质学 | 3026篇 |
海洋学 | 529篇 |
天文学 | 130篇 |
综合类 | 366篇 |
自然地理 | 379篇 |
出版年
2024年 | 18篇 |
2023年 | 69篇 |
2022年 | 126篇 |
2021年 | 164篇 |
2020年 | 157篇 |
2019年 | 204篇 |
2018年 | 142篇 |
2017年 | 196篇 |
2016年 | 211篇 |
2015年 | 203篇 |
2014年 | 294篇 |
2013年 | 235篇 |
2012年 | 283篇 |
2011年 | 278篇 |
2010年 | 252篇 |
2009年 | 297篇 |
2008年 | 263篇 |
2007年 | 313篇 |
2006年 | 292篇 |
2005年 | 264篇 |
2004年 | 232篇 |
2003年 | 208篇 |
2002年 | 208篇 |
2001年 | 184篇 |
2000年 | 181篇 |
1999年 | 157篇 |
1998年 | 124篇 |
1997年 | 134篇 |
1996年 | 132篇 |
1995年 | 84篇 |
1994年 | 97篇 |
1993年 | 76篇 |
1992年 | 72篇 |
1991年 | 57篇 |
1990年 | 42篇 |
1989年 | 33篇 |
1988年 | 23篇 |
1987年 | 8篇 |
1986年 | 9篇 |
1985年 | 5篇 |
1984年 | 3篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1978年 | 1篇 |
1954年 | 2篇 |
排序方式: 共有6342条查询结果,搜索用时 172 毫秒
51.
浙闽山区茶叶生产基地评价的探讨 总被引:6,自引:0,他引:6
茶叶基地的评价包括对基地的自然和经济条件的评估,应用系统分析方法,将自然和经济条件进行定量的综合评估,用综合评价值区分基地间的差异,最后定性与定量相结合,提出茶叶生产基地的合理布局. 相似文献
52.
Turchanina Oksana Satin Vladimir Derevyanko Aleksey 《中国地球化学学报》2006,25(B08):51-52
As is well known, a high content of sulphur in coals is an effect of the post-depositional history of coal seams and one of the most important criteria of its use as a fuel. Sulphur in coals can cause a serious environmental and technological problem during their utilization. This problem is very actual for the Donetsk Basin because 734 mined seams out of the total of 1009 (73%) are comprised of coals with sulphur content -2%. The chemical pre-treatment as a first stage in their processing is widely used in order to effectively obtain the thermal destruction products of coals (such as semi-coke, coke, adsorbents, etc.) and to simultaneously utilize coal wastes. Development in pre-treatment methods for high-sulphur, low-rank coals is especially desirable for reducing the sulphur contents of the solid products. The aim of the present work is to investigate the influence of coal pre-treatment on the yield and composition of thermal destruction products, and the sulphur distribution among different components of the coals of different genetic types by reductivity (low-reduced LRC and reduced RC coals). The thermal behavior of the coals was studied by means of the Fisher method (heated to 520℃, at a rate of 7℃/min). The composition of the semi-coking gas was investigated by means of a VTI gas analyzer. The coal samples were chemically treated directly before thermal destruction by the introduction of 1-% solutions of radical polymerization initiator AAD (acrylic acid dinitrile C8H12N4) and products of coal-tar distillation (absorber oil). Coal pre-treatment increases the semi-coke yield and its coking ability, and changes the liquid/gaseous product ratio. 相似文献
53.
Controls on low-pressure anatexis 总被引:2,自引:0,他引:2
Low-pressure anatexis, whereby rocks melt in place after passing through the andalusite stability field, develops under more restricted conditions than does low-pressure metamorphism. Our thermal modelling and review of published work indicate that the following mechanisms, operating alone, may induce anatexis in typical pelitic rocks without inducing wholesale melting in the lower crust: (i) magmatic advection by pervasive flow; (ii) crustal-scale detachment faulting; and (iii) the presence of a high heat-producing layer. Of these, only magmatic advection by pervasive flow and crustal-scale detachment faulting have been shown quantitatively to provide sufficient heat to cause widespread melting. Combinations of the above mechanisms with pluton-scale magmatic advection, shear heating, removal of the lithospheric mantle, or with each other provide additional means of developing suitable high temperatures at shallow crustal levels to generate low-pressure anatexis. 相似文献
54.
The relationship between depth, age and gravity in the oceans 总被引:2,自引:0,他引:2
55.
56.
Jin-Yong Lee Jeong-Yong Cheon Hyung-Pyo Kwon Hee-Sung Yoon Seong-Sun Lee Jong-Ho Kim Joung-Ku Park Chang-Gyun Kim 《Environmental Geology》2006,51(4):581-593
Attenuation characteristics of landfill leachate were examined for two uncontrolled landfills in Korea. The two landfills containing municipal wastes without appropriate bottom liner and leachate treatment system have different landfill age, waste volume, and most importantly different hydrogeologic settings. One landfill (Cheonan landfill) is situated in an open flat area while the other (Wonju landfill) is located in a valley. Variations of various parameters including dissolved organic carbon (DOC), dissolved oxygen (DO), alkalinity, pH, electrical conductivity (EC), redox potential (ORP), ammonia (NH3), nitrate (NO3−), sulfate (SO42−), and chloride (Cl−) were examined along groundwater flow path. All these parameters were analyzed every month for a year. In the interior of the landfills, typical anaerobic conditions revealed by low DO and NO3 concentrations, negative ORP values, high NH3, alkalinity, and Cl− concentrations were observed. Generally, higher levels of contaminants (DOC, NH3, and Cl−) were detected in the dry season while they were greatly lowered in the wet season. Significantly, large decrease of Cl- concentration in the wet season indicates that the dilution or mixing is one of dominant attenuation mechanisms of leachate. But detailed variation behaviors in the two landfills are different and they were largely dependent on permeability of surface and subsurface layers. The intermediately permeable surface of the landfills receives part of direct rainfall infiltration but most rainwater is lost to fast runoff. The practically impermeable surface of clayey silt (paddy field) at immediately adjacent to the Cheonan landfill boundary prevented direct rainwater infiltration and hence redox condition of the ground waters were largely affected by that of the upper landfill and the less permeable materials beneath the paddy fields prohibited dispersion of the landfill leachate into down gradient area. In the Wonju landfill, there are three different permeability divisions, the landfill region, the sandy open field and the paddy field. Roles of the landfill and paddy regions are very similar to those at the Cheonan. The very permeable sandy field receiving a large amount of rainwater infiltration plays a key role in controlling redox condition of the down gradient area and contaminant migration. This paper reports details of the attenuation and redox conditions of the landfill leachates at the two uncontrolled landfills. 相似文献
57.
1 IntroductionThe Mesozoic-Cenozoic tectonic evolution and ki-netics mechanism of the intracontinental orogen are thekey subjects of continental dynamics (Ma Zongjin andGao Xianglin, 2004) and the key to understanding theregional geological tectonics (Qia… 相似文献
58.
通过对向斜洼地含水层水文地质特征的勘探及研究,对研究区的水文地质边界条件进行了概化,并用水均衡法估算了地下水资源量,对拟建一级电站引水渠沿线提取地下水进行融冰的可行性进行了研究,并提出了取水方案. 相似文献
59.
岩石、土壤样品中210Po测定方法的研究 总被引:1,自引:0,他引:1
研究了以铜箔为镀片时,自沉积总α计数法定量测定岩石、土壤样品中210Po的最佳制源环境、同位素的干扰和去除、共存元素的允许量以及适宜的溶(熔)矿方法,同时研究了银、铜两种镀片的区别。试验发现,当盐酸浓度为2.0mol/L,恒温80℃,振荡频率为180次/min、振程20mm时,制源2.0h,210Po自镀回收率在99.6%~100.4%之间,210Po加入量与α净计数率线性相关系数为0.9999。放置衰变法可以消除212Bi和218Po等短半衰期核素对210Po测量产生的影响,Vc存在时其它共存元素不干扰测定。方法配合HNO3HFHClO4溶矿(对复杂试样酸溶后的不溶渣,再进行碱熔),全程回收率为99.5%~100.4%。 相似文献
60.
对镇(安)旬(阳)矿田泥盆系、志留系铅锌矿的成矿地质条件分析表明,本区泥盆系、志留系铅锌矿总体属层控矿床类型。铅锌矿赋存于下志留统悔子垭组、中志留统双河镇组及中泥盆统大枫沟组、上泥盆统南羊山组;控矿构造为断裂、褶皱,容矿构造为顺层断裂带、剪切带,含矿岩石为含碳砂岩、千枚岩及灰岩、生物灰岩、白云岩;沉积环境为浅水陆棚相、台地边缘及泻湖、潮坪、台地浅海。以旬阳泗人沟为代表的志留系铅锌矿属细碎屑岩沉积强改造型铅锌矿床;以旬阳大岭、赵家庄为代表的泥盆系铅锌矿属碳酸盐岩沉积弱改造型铅锌矿床;以镇安锡铜沟、月西为代表的泥盆系铅锌矿属碳酸盐岩沉积强改造型铅锌矿床。 相似文献