全文获取类型
收费全文 | 29419篇 |
免费 | 4944篇 |
国内免费 | 30417篇 |
专业分类
安全科学 | 2355篇 |
废物处理 | 1492篇 |
环保管理 | 2375篇 |
综合类 | 38188篇 |
基础理论 | 5221篇 |
环境理论 | 2篇 |
污染及防治 | 11101篇 |
评价与监测 | 2107篇 |
社会与环境 | 832篇 |
灾害及防治 | 1107篇 |
出版年
2024年 | 21篇 |
2023年 | 334篇 |
2022年 | 988篇 |
2021年 | 818篇 |
2020年 | 1214篇 |
2019年 | 2450篇 |
2018年 | 2703篇 |
2017年 | 2887篇 |
2016年 | 2847篇 |
2015年 | 3339篇 |
2014年 | 3888篇 |
2013年 | 4660篇 |
2012年 | 4067篇 |
2011年 | 3822篇 |
2010年 | 3231篇 |
2009年 | 3256篇 |
2008年 | 3105篇 |
2007年 | 2915篇 |
2006年 | 2463篇 |
2005年 | 1833篇 |
2004年 | 1498篇 |
2003年 | 1368篇 |
2002年 | 1201篇 |
2001年 | 1111篇 |
2000年 | 1273篇 |
1999年 | 1210篇 |
1998年 | 928篇 |
1997年 | 849篇 |
1996年 | 841篇 |
1995年 | 732篇 |
1994年 | 523篇 |
1993年 | 430篇 |
1992年 | 459篇 |
1991年 | 361篇 |
1990年 | 274篇 |
1989年 | 231篇 |
1988年 | 173篇 |
1987年 | 92篇 |
1986年 | 84篇 |
1985年 | 60篇 |
1984年 | 60篇 |
1983年 | 46篇 |
1982年 | 50篇 |
1981年 | 39篇 |
1979年 | 5篇 |
1978年 | 7篇 |
1975年 | 4篇 |
1974年 | 4篇 |
1972年 | 8篇 |
1971年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
691.
Stratigraphy, lithology and depositional structures of Liassic red limestone-breccias of the Adnet Formation, including the 'Adnet Scheck', were studied at several outcrops of the Northern Calcareous Alps (NCA) south-east of Salzburg. A four-fold lithostratigraphic division is proposed for the Adnet Formation of the Osterhorn Mountains: the hemipelagic Schmiedwirt (Sinemurian) and Kehlbach (Carixian) members are separated from the pelagic Saubach Member (Toarcian) by a layer of amalgamated breccias (Scheck Member, probably Domerian to early Toarcian). Several other breccia beds occur locally from the base of the Kehlbach Member up to the lower Saubach Member. Although the sediments overlying the Scheck Member breccias are of coeval age, the ages of the underlying strata are very different. This can be explained by submarine Liassic erosion during a period of resedimentation from the middle Carixian until the early Toarcian. At least 10–15?m of partly lithified sediments were eroded by gravity flows. The entire Kehlbach Member and up to two-thirds of the Schmiedwirt Member were removed at Adnet. The breccias originated from submarine debris flows. Repeated flows over a long period and the depositional setting exclude a triggering by sea-level fluctuations. Most probably they arose from tectonically triggered slumps and slides of superficial sediments. The 'Scheck' was initiated on the steep upper slope of the drowned Triassic Adnet reef and flowed to the north-east.The Pliensbachian to early Toarcian period of tectonic activity indicated by the breccias was the most important during the Liassic in the Osterhorn Mountains and other parts of the NCA. From the large-scale regional distribution of the breccias and in accord with published data, a roughly north-east trending strike-slip fault zone is proposed, crossing the NCA south of the Osterhorn block, with a peaking activity during the Pliensbachian to early Toarcian as the cause of the tectonic movements. 相似文献
692.
A. Kr?ner A. P. Willner E. Hegner A. Frischbutter J. Hofmann R. Bergner 《Geologische Rundschau》1995,84(3):437-456
Single zircons from two orthogneiss complexes, the Grey Gneiss and Red Gneiss, the lowermost tectonic units in the Erzgebirge, were dated. The grey Freiberg Gneiss is of igneous origin and has a 207Pb/206Pb emplacement age of 550±7 Ma. A quartz monzonite from Lauenstein contains idiomorphic zircons with a mean 207Pb/206Pb age of 555±7 Ma as well as xenocrysts ranging in age between 850 and 1910 Ma. Red gneisses from the central Erzgebirge contain complex zircon populations, including numerous xenocrysts up to 2464 Ma in age. The youngest, idiomorphic, zircons in all samples yielded uniform 207Pb/206Pb ages between 550±9 and 554±10 Ma. Nd isotopic data support the interpretation of crustal anatexis for the origin of both units. Nd(t) values for the grey gneisses are –7.5 and –6.0 respectively, (mean crustal residence ages of 1.7–1.8 Ga). The red gneisses have a wider range in Nd(t) values from –7.7 to –2.8 (T
DM ages of 1.4–1.8 Ga). The zircon ages document a distinct late Proterozoic phase of granitoid magmatism, similar in age to granitoids in the Lusatian block farther north-east. However, Palaeozoic deformation as well as medium pressure metamorphism ( 8 kbar/600–650° C) are identical in both gneiss units and distinguish these rocks from the Lusatian granitoids. The grey and red gneisses were overthrust by units with abundant high-pressure relicts and a contrasting P-T evolution. Zircon xenocryst and Nd model ages in the range 1000–1700 Ma are similar to those in granitoid rocks of Lusatia and the West-Sudetes, and document a pre-Cadomian basement in parts of east-central Europe that, chronologically, has similarities with the Sveconorwegian domain in the Baltic Shield. 相似文献
693.
694.
695.
主要介绍了工业牌号高强铝合金在供应态或经简单预处理后在通用油压机上超塑成形的实例,并分析探讨了非理想组织材料超塑成形中微观组织的变化。 相似文献
696.
论述了高效液相色谱法适于环境样品中分子量大、挥发性低、热稳定性差的有机污染物的分析与分离。参阅了国内外文献,例举了用高效液相色谱法测定环境样品中多环芳烃、酚类、多氯联苯、酞酸酯类、联苯胺类、阴离子和非离子表面活性剂、有机农药等有机污染物的测定条件及分离结果。 相似文献
697.
Wu Zhenbin Xia Yicheng Zhang Yongyuan Deng Jiaqi Chen Xitao Zhan Facui Wang Deming 《环境科学学报(英文版)》1994,6(1):13-20
PurificationandreclamationofwastewaterbyanintegratedbiologicalpondsystemWuZhenbin;XiaYicheng;ZhangYongyuan;DengJiaqi;ChenXita... 相似文献
698.
699.
本文应用模糊论方法学以及聚类分析、贴近度计算,择近原理等数学手段,把沈阳市原有的48条干线优化成12条监测干线.经 F 检验、T 检验及其它各种误差检验,证明了优化结果具有较高精度,满足了国家城市环境质量综合整治定量考核及监测规范的要求,为城市交通噪声监测布点优化,提供了借鉴及参考. 相似文献
700.
本文在深入研究6个城市的定量考核指标体系的基础上,提出了城市环保战略目标定量考核指标体系建立的依据和原则,探讨了指标体系的结构与指标选取问题.本文认为,城市环保战略目标定量考垓指标体系应由目标层、准则层和指标层三个层次构成,整个结构是自上而下分解,自下而上递进. 相似文献