全文获取类型
收费全文 | 2773篇 |
免费 | 116篇 |
国内免费 | 1026篇 |
专业分类
安全科学 | 214篇 |
废物处理 | 145篇 |
环保管理 | 192篇 |
综合类 | 1704篇 |
基础理论 | 431篇 |
污染及防治 | 880篇 |
评价与监测 | 121篇 |
社会与环境 | 108篇 |
灾害及防治 | 120篇 |
出版年
2024年 | 4篇 |
2023年 | 44篇 |
2022年 | 131篇 |
2021年 | 111篇 |
2020年 | 82篇 |
2019年 | 84篇 |
2018年 | 95篇 |
2017年 | 135篇 |
2016年 | 106篇 |
2015年 | 135篇 |
2014年 | 214篇 |
2013年 | 261篇 |
2012年 | 214篇 |
2011年 | 228篇 |
2010年 | 198篇 |
2009年 | 177篇 |
2008年 | 185篇 |
2007年 | 181篇 |
2006年 | 162篇 |
2005年 | 128篇 |
2004年 | 82篇 |
2003年 | 117篇 |
2002年 | 83篇 |
2001年 | 75篇 |
2000年 | 86篇 |
1999年 | 79篇 |
1998年 | 67篇 |
1997年 | 74篇 |
1996年 | 91篇 |
1995年 | 71篇 |
1994年 | 57篇 |
1993年 | 50篇 |
1992年 | 38篇 |
1991年 | 15篇 |
1990年 | 19篇 |
1989年 | 11篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有3915条查询结果,搜索用时 484 毫秒
971.
采用门限自回归模型预测环境空气质量 总被引:3,自引:0,他引:3
应用汤家豪博士提出的门限自回归模型,以上海市环境空气质量时间序列监测数据和相应的气象数据,建立门限自回归大气污染预测模型,对上海市环境空气质量进行预测预报。结果表明:门限自回归模型计算较为简便且便于计算机自动建模。显著性检验表明门限自回归预报方程高度显著,在实际应用中,采用最新的数据建模和采用分站建立模型的方法可以使预测精度进一步提高。 相似文献
972.
973.
974.
西昆仑造山带包括西昆仑山、喀喇昆仑山和帕米尔高原部分地区,是青藏高原有机组成部分.它位于古亚洲构造域与特提斯构造域结合部位,大地构造位置特殊,研究意义重要.区内岩浆活动强烈,花岗岩广泛出露.已有许多学者对该区花岗岩作过研究,但以往的研究基本沿中巴公路和新藏公路进行,并侧重于年代学方面,还没有从花岗岩岩石系列和成因类型(前人主要报道过钙碱性系列和Ⅰ型花岗岩)以及构造-岩浆演化等方面作深入研究.本次工作深入到西昆仑造山带腹地,对区内不同时期有代表性的22个花岗岩体进行了地质、地球化学综合研究,取得了如下重要进展和创新认识: 相似文献
975.
976.
977.
978.
为了制备可见光激发下能高效降解含盐废水中有机物的光催化剂,首次以商用TiO_2光催化剂(P25)为载体,利用吸附相反应技术一步获得了Ag沉积的可见光响应复合光催化剂.同时,通过XPS、TEM、HRTEM及紫外可见漫反射光谱图,结合多种高含盐水体系中苯酚的光催化降解过程,研究了不同Ag沉积对催化剂可见光活性的影响.结果发现,吸附平衡后P25表面富含水的吸附层可作为反应和粒子的生成场所,生成量子尺寸的Ag粒子.另外,在吸附层中生成的Ag粒子均匀分布于P25表面并与之紧密结合,并在TiO_2晶格结构中引入晶格交错结构.Ag与TiO_2的表面等离子体共振效应和晶格交错结构共同提升了催化剂的可见光响应和电荷的分离效率,增强了催化剂对苯酚的可见光催化性能.在含盐废水体系中,盐离子数量越多,催化剂在可见光下降解苯酚过程受到的干扰越大. 相似文献
979.
Tetrabromobisphenol A (TBBPA) and its derivatives are now being highly concerned due to their emerging environmental occurrence and deleterious effects on non-target organisms. Considering the potential neurotoxicity of TBBPA derivatives which has been demonstrated in vitro, what could happen in vivo is worthy of being studied. Tetrabromobisphenol A bis(2-hydroxyethyl ether) (TBBPA-BHEE), a representative TBBPA derivative, was selected for a 21-day exposure experiment on neonatal Sprague Dawley (SD) rats through intranasal administration. The neurobehavioral, histopathological changes, and differentially expressed genes based on RNA microarray were investigated to evaluate the neurological effects of this chemical. The results indicated that TBBPA-BHEE exposure significantly compromised the motor co-ordination performance and the locomotor activities (p < 0.05). The neurobehavioral phenotype could be attributed to the obvious histopathological changes in both cerebrum and cerebellum, such as neural cell swelling, microglial activation and proliferation. A total of 911 genes were up-regulated, whereas 433 genes were down-regulated. Gene set enrichment analysis showed multiple signaling pathways, including ubiquitin-mediated proteolysis and wingless-int (Wnt) signaling pathway etc. were involved due to TBBPA-BHEE exposure. The gene ontology enrichment analysis showed the basic cellular function and the neurological processes like synaptic transmission were influenced. The toxicological effects of TBBPA-BHEE observed in this study suggested the potential neuronal threaten from unintended exposure, which would be of great value in the biosafety evaluation of TBBPA derivatives. 相似文献
980.
Ni Ni Renyong Shi Zongtang Liu Yongrong Bian Fang Wang Yang Song Xin Jiang 《环境科学学报(英文版)》2018,30(1):296-306
The immobilization of co-contaminants of organic and inorganic pollutants by biochar is an efficient remediation strategy. However, the effect of biochar amendments on the bioaccessibility of the co-contaminants in dry versus flooded soils has rarely been compared. In batch experiments, bamboo-derived biochar(BB) had a higher sorption capacity for phenanthrene(Phe)/pyrene(Pyr)/zinc(Zn) than corn straw-derived biochar(CB), while CB had a higher sorption capacity for lead(Pb) than BB. After 150 days of incubation, the amendments of 2% CB, 0.5% BB and 2% BB effectively suppressed the dissipation and reduced the bioaccessibility of Phe/Pyr by 15.65%/18.02%, 17.07%/18.31%and 25.43%/27.11%, respectively, in the aerobic soils. This effectiveness was more significant than that in the anaerobic soils. The accessible Zn/Pb concentrations were also significantly lower in the aerobic soils than in the anaerobic soils, regardless of treatments.The Gram-negative bacterial biomass and the Shannon–Weaver index in the aerobic soil amended with 2% CB were the highest. The soil microbial community structure was jointly affected by changes in the bioaccessibility of the co-contaminants and the soil physiochemical properties caused by biochar amendments under the two conditions. Therefore, dry land farming may be more reliable than paddy soil cultivation at reducing the bioaccessibility of Phe/Pyr/Zn/Pb and enhancing the soil microbial diversity in the short term. 相似文献