全文获取类型
收费全文 | 2969篇 |
免费 | 83篇 |
国内免费 | 778篇 |
专业分类
安全科学 | 141篇 |
废物处理 | 201篇 |
环保管理 | 239篇 |
综合类 | 1151篇 |
基础理论 | 563篇 |
环境理论 | 1篇 |
污染及防治 | 1194篇 |
评价与监测 | 145篇 |
社会与环境 | 84篇 |
灾害及防治 | 111篇 |
出版年
2023年 | 35篇 |
2022年 | 122篇 |
2021年 | 108篇 |
2020年 | 64篇 |
2019年 | 72篇 |
2018年 | 109篇 |
2017年 | 116篇 |
2016年 | 169篇 |
2015年 | 159篇 |
2014年 | 215篇 |
2013年 | 284篇 |
2012年 | 239篇 |
2011年 | 256篇 |
2010年 | 185篇 |
2009年 | 193篇 |
2008年 | 193篇 |
2007年 | 173篇 |
2006年 | 166篇 |
2005年 | 114篇 |
2004年 | 104篇 |
2003年 | 114篇 |
2002年 | 80篇 |
2001年 | 89篇 |
2000年 | 70篇 |
1999年 | 60篇 |
1998年 | 54篇 |
1997年 | 54篇 |
1996年 | 33篇 |
1995年 | 33篇 |
1994年 | 30篇 |
1993年 | 20篇 |
1992年 | 23篇 |
1991年 | 17篇 |
1990年 | 18篇 |
1989年 | 15篇 |
1988年 | 8篇 |
1987年 | 7篇 |
1986年 | 3篇 |
1985年 | 6篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1970年 | 1篇 |
1958年 | 2篇 |
1956年 | 1篇 |
排序方式: 共有3830条查询结果,搜索用时 281 毫秒
1.
Zgłobicki Wojciech Telecka Małgorzata Skupiński Sebastian 《Environmental science and pollution research international》2021,28(15):18328-18341
Environmental Science and Pollution Research - In the paper, the pollution of playgrounds in Lublin with heavy metals was assessed. Since playgrounds are a place of activity of children—the... 相似文献
2.
3.
The amounts of total NH
4
+
detected in the external media in which Phascolosoma arcuatum had been exposed to various periods of anoxia were significantly greater than those in which the worms were exposed to normoxia for a similar period. The increased NH
4
+
production by P. arcuatum during anoxic exposure was unlikely to be due to an increased catabolism of adenine nucleotides or urea. In contrast, there were significant decreases in the concentrations of several free amino acids in the coelomic plasma and body tissues of individuals during the 48 h of anoxic exposure. The amount of NH
4
+
produced by the anoxic P. arcuatum could be accounted for by the decreases in the concentrations of aspartate or glycine. Increases in the catabolism of free amino acids (FAA), leading to the increased production of NH
4
+
, in P. arcuatum during anoxia were supported by the detection of significant changes in the kinetic properties of glutamate dehydrogenase (GDH), in the deaminating direction, from worms exposed to anoxia for 48 h. The apparent increase in the affinity of GDH from the anoxic worm to glutamate would bring about a greater deaminating activity at physiological concentrations of ths substrate. P. arcuatum used in these experiments were collected from the mangrove swamp at Mandai, Singapore between 1990 and 1993. 相似文献
4.
5.
详细讨论了卫星遥感技术在长江流域水资源管理方面的应用问题,提出了两种实用的方法:①卫星遥感技术在灌溉水资源管理方面的应用;②长江流域地下水、地表水资源估算。进一步分析了两种方法的特点,介绍了卫星遥感技术的优点及用途,建议在长江流域水资源管理中加以利用。 相似文献
6.
关中地区飑线天气的预测及灾害对策探讨 总被引:1,自引:0,他引:1
对1961~1990年发生在陕西省关中地区的飑线天气及其灾害进行了统计分析,并从天气形势背景方面对飑线的发生发展进行了研究和分析,同时就飑线的预测和防灾对策进行了探讨。 相似文献
7.
Coping with riverbank erosion hazard and displacement in bangladesh: survival strategies and adjustments 总被引:2,自引:0,他引:2
As a deltaic plain, Bangladesh annually experiences riverbank erosion hazard due to sudden and rapid channel shifting, particularly in the major floodplain areas of the country. Consequently, valuable cultivable land is lost; also village settlements, markets and towns are destroyed, displacing tens of thousands of people. This paper examines the magnitude of river channel migration and encroachment on land, and the nature of human adjustment systems in the Brahmaputra–Jamuna floodplain, by investigating aspects of the social and cultural dynamics of resettlement of the displaced people. Some policy measures are recommended to improve the ability of the people in the floodplain to cope with these hazards. 相似文献
8.
Jiao Youzhou Xue Huizan He Chao Wang Zigang Ma Xiaoran Liu Xinxin Liu Liang Chang Chun Petracchini Francesco Li Panpan 《Environment, Development and Sustainability》2022,24(4):4709-4726
Environment, Development and Sustainability - Anaerobic digestion (AD) is an attractive straw resource treatment technology as it can improve the utilization efficiency of straw resource. Raw straw... 相似文献
9.
Zheng Yali He Xiaoyi Wang Hewu Wang Michael Zhang Shaojun Ma Dong Wang Binggang Wu Ye 《Mitigation and Adaptation Strategies for Global Change》2020,25(3):355-370
Mitigation and Adaptation Strategies for Global Change - Electric vehicles (EVs) play a crucial role in addressing climate change and urban air quality concerns. China has emerged as the global... 相似文献
10.
天然沸石具有离子交换能力,但其中含有很多杂质,离子结合性强弱不一,导致交换性能较低,可以通过化学改性来提升沸石的交换性能。对应用氧化锌改性沸石的城市污水重金属离子去除技术进行研究。测试过程中,使用自来水对沸石填料进行反向冲洗,废水经过水泵提升之后,分别进至3个交换柱中,流过沸石填料,流量通过水阀门进行控制,试验每隔0.5 h~1 h进行取样1次,并分别取进水与出水的水样,读取测压管,对水头损失进行计算。 相似文献