全文获取类型
收费全文 | 2274篇 |
免费 | 109篇 |
国内免费 | 788篇 |
专业分类
安全科学 | 173篇 |
废物处理 | 146篇 |
环保管理 | 162篇 |
综合类 | 1273篇 |
基础理论 | 392篇 |
污染及防治 | 715篇 |
评价与监测 | 81篇 |
社会与环境 | 67篇 |
灾害及防治 | 162篇 |
出版年
2024年 | 1篇 |
2023年 | 43篇 |
2022年 | 119篇 |
2021年 | 106篇 |
2020年 | 65篇 |
2019年 | 74篇 |
2018年 | 79篇 |
2017年 | 112篇 |
2016年 | 122篇 |
2015年 | 148篇 |
2014年 | 166篇 |
2013年 | 235篇 |
2012年 | 187篇 |
2011年 | 198篇 |
2010年 | 156篇 |
2009年 | 130篇 |
2008年 | 157篇 |
2007年 | 124篇 |
2006年 | 105篇 |
2005年 | 76篇 |
2004年 | 64篇 |
2003年 | 75篇 |
2002年 | 61篇 |
2001年 | 58篇 |
2000年 | 60篇 |
1999年 | 83篇 |
1998年 | 61篇 |
1997年 | 57篇 |
1996年 | 50篇 |
1995年 | 49篇 |
1994年 | 28篇 |
1993年 | 38篇 |
1992年 | 31篇 |
1991年 | 24篇 |
1990年 | 14篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1984年 | 3篇 |
1981年 | 2篇 |
1958年 | 1篇 |
排序方式: 共有3171条查询结果,搜索用时 515 毫秒
691.
Yu Hongwei Hu Xiaoyue Gao Juan 《Environmental science and pollution research international》2023,30(2):2703-2720
Environmental Science and Pollution Research - Haze pollution may decrease drivers’ driving performance by worsening their physical and psychological states. This paper explores the effects... 相似文献
692.
Environmental Chemistry Letters - Dissolved organic matter (DOM) is a complex substance occurring in marine and freshwater environments. DOM has many functions that modify physical, chemical and... 相似文献
693.
近年来,纳米材料的广泛使用使其大量进入环境.为保障纳米科技可持续发展,各国政府不断加大力
度,支持纳米环境健康安全领域的研究.例如,欧盟第六和第七框架计划将人体安全、健康和环境效应列为
最优先支持课题,投入达24亿欧元.之后制定了2015-2025纳米材料安全研究路线图,即《欧盟纳米安全
2015-2025:向安全和可持续的纳米材料和纳米技术创新迈进》(Nanosafety in Europe 2015-2025: Towards Safe
and Sustainable Nanomaterials and Nanotechnology Innovations). 相似文献
694.
695.
696.
Chuanjin Yu Lili Fan Jinxin Gao Meng Wang Qiong Wu Jun Tang 《Journal of environmental science and health. Part. B》2013,48(10):708-717
Platelet-activating factor acetylhydrolase (PAF-AH) derived from Trichoderma harzianum was upregulated by the interaction of T. harzianum with maize roots or the foliar pathogen Curvularia lunata. PAF-AH was associated with chitinase and cellulase expressions, but especially with chitinase, because its activity in the KO40 transformant (PAF-AH disruption transformant) was lower, compared with the wild-type strain T28. The result demonstrated that the colonization of maize roots by T. harzianum induced systemic protection of leaves inoculated with C. lunata. Such protection was associated with the expression of inducible jasmonic acid pathway-related genes. Moreover, the data from liquid chromatography-mass spectrometry confirmed that the concentration of jasmonic acid in maize leaves was associated with the expression level of defense-related genes, suggesting that PAF-AH induced resistance to the foliar pathogen. Our findings showed that PAF-AH had an important function in inducing systemic resistance to maize leaf spot pathogen. 相似文献
697.
698.
蚯蚓处理对污泥中微生物碳量及脱氢酶活性的影响 总被引:3,自引:2,他引:1
将含水率80.6%的脱水污泥制成5 mm的污泥颗粒,以添加蚯蚓(赤子爱胜蚓)为处理组,无蚯蚓为对照组,测定不同时期污泥的理化性质、微生物碳量(MBC)和脱氢酶活性(DHA)的变化,重点研究了蚯蚓对污泥降解过程中MBC和DHA变化的影响.结果表明,相比对照组,蚯蚓处理组p H变化幅度较小;实验结束时,蚯蚓处理组的电导率(EC)和溶解性有机碳(DOC)显著高于对照组,而有机质(OM)显著低于对照组.实验前30 d,蚯蚓处理组MBC显著高于对照组,40 d至实验结束,蚯蚓处理组MBC显著低于对照组.DHA的结果表明,蚯蚓处理组和对照组在前30 d并没有显著性差异,40 d后蚯蚓处理组的DHA显著低于对照组,DHA稳定在2.98~6.40 mg·g-1·h-1(以TPF计).相关分析表明,DHA、MBC和OM之间显著正相关.研究表明,接种蚯蚓在实验前期显著提升了系统的微生物量,加快污泥有机质的降解,从而导致后期产物的微生物量及其活性较低,最终产物更稳定. 相似文献
699.
从石灰石-石膏湿法烟气脱硫工艺的流程、基本原理,研究了脱硫效率的影响因素:石灰石浆液pH值、钙硫比、液气比、吸收塔进口粉尘含量、烟气中SO_2浓度、烟气含氧量等烟气脱硫工艺条件对脱硫效率的影响。根据上述研究结果,从工艺及设备运行角度探讨如何控制适宜的工艺条件,优化提高石灰石-石膏湿法烟气脱硫工艺的脱硫效率,使烟气中SO_2排放浓度控制在25 mg/m~3左右,达到GB 13223—2011《火电厂大气污染物排放标准》中SO_2小于200 mg/m~3的排放标准。 相似文献
700.
Oil gelling agents are widely used in emergency response of marine oil spills. However, the biological toxicity of oil gelling agents is not well understood. This research aimed to evaluate the environmental safety of oil gelling agents used for rapid removal and cleanup of marine oil spills. We used luminescent bacteria (Acinetobacter sp. Tox2 and Acinetobacter sp. RecA) combined with exposure experiment using marine medaka (Oryzias melastigma) juveniles to detect the acute toxicity and genotoxicity of 10 oil gelling agents. As a result, a certain level of acute toxicity was detected from the oil gelling agent FOA and GMN-01 (the toxicity equivalent to 0.067 mg/L and 0.084 mg/L of HgCl2, respectively), and a certain level of genotoxicity was detected from the oil gelling agent NORSOREX (the toxicity equivalent to 0.307 mg/L of MMC) by the luminescent bacteria test. However, no obvious acute toxicity or genotoxicity was detected from the above three oil gelling agents in fish-exposure experiments. Our results suggest that the 10 oil gelling agents have no obvious acute toxicity or genotoxicity to higher organisms (including marine medaka). The luminescent bacteria test is more sensitive in detecting biological toxicity of oil gelling agents. This study provides a reference for environmental safety evaluation of the oil gelling agents used in the cleaning up of the marine oil spills. 相似文献