全文获取类型
收费全文 | 198篇 |
免费 | 6篇 |
国内免费 | 63篇 |
专业分类
安全科学 | 5篇 |
废物处理 | 12篇 |
环保管理 | 16篇 |
综合类 | 95篇 |
基础理论 | 34篇 |
污染及防治 | 81篇 |
评价与监测 | 14篇 |
社会与环境 | 6篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 5篇 |
2022年 | 6篇 |
2021年 | 8篇 |
2020年 | 4篇 |
2019年 | 4篇 |
2018年 | 10篇 |
2017年 | 9篇 |
2016年 | 10篇 |
2015年 | 12篇 |
2014年 | 14篇 |
2013年 | 19篇 |
2012年 | 13篇 |
2011年 | 12篇 |
2010年 | 12篇 |
2009年 | 10篇 |
2008年 | 15篇 |
2007年 | 16篇 |
2006年 | 16篇 |
2005年 | 8篇 |
2004年 | 13篇 |
2003年 | 8篇 |
2002年 | 4篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 8篇 |
1995年 | 4篇 |
1993年 | 6篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有267条查询结果,搜索用时 15 毫秒
261.
Kunyu Jiang Zhaowen Cheng Ziyang Lou Luochun Wang Hailin Lu Bijun Xu Ningben Jin 《环境科学学报(英文版)》2021,33(5):196-206
The explosive increase of construction and demolition waste (CDW) caused the insufficient source separation and emergency disposal at domestic waste landfills in many developing countries. Some organic fractions were introduced to the CDW landfill process and resulted in serious odor pollution. To comprehensively explore the impacts of organic matters on odor emission patterns, five CDW landfills (OIL), with organic matters/ inert CDW components (O/I) from 5% to 30%, and the control group only with inert components (IL) or organics (OL) were simulated at the laboratory. The chemical and olfactive characters of odors were evaluated using the emission rate of 94 odorants content (ERtotal), theory odor concentration (TOCtotal), and e-nose concentration (ERENC), and their correlations with waste properties were also analyzed. It was found that the main contributors to ERtotal (IL: 93.0% NH3; OIL: 41.6% sulfides, 31.0% NH3, 25.9% oxygenated compounds) and TOC total (IL: 64.1% CH3SH, 28.2% NH3; OIL: 71.7% CH3SH, 24.8% H2S) changed significantly. With the rise of O/I, ERtotal, TOCtotal, and ERENC increased by 10.9, 20.6, and 2.1 times, respectively. And the organics content in CDW should be less than 10% (i.e., DOC<101.3 mg/L). The good regressions between waste properties (DOC, DN, pH) and (r=0.86, 0.86, -0.88, p<0.05), (r=0.82, 0.79, -0.82, p<0.05) implied that the carbon sources and acidic substances relating to organics degradation might result in that increase. Besides, the correlation analysis results ( vs. , r=0.96, p<0.01; vs. , r=0.86, p<0.05) indicated that e-nose perhaps was a reliable odor continuous monitoring tool for CDW landfills. 相似文献
262.
263.
溢油模型理论及研究综述 总被引:10,自引:0,他引:10
油在水中的行为和归宿是一个复杂的过程,包括在重力、表面张力、惯性力和粘性力作用下的物理扩展,挥发、乳化、溶解、光氧化和生物降解等风化过程引起的化学变化,流场、风场等动力因素作用下的漂移运动以及随机部分。通过总结国内外的研究现状,概括了各个模型的理论依据、基本假设、应用范围,并对今后发展方向提出了几点展望。 相似文献
264.
基于DOC+CDPF后处理技术的公交车实际道路颗粒物排放特性 总被引:1,自引:1,他引:1
利用车载排放测试系统,对柴油公交车安装氧化催化转化器(DOC)+催化型颗粒捕集器(CDPF)前后的实际道路工况颗粒物排放特性进行了研究。安装DOC+CDPF前后,稳态工况下,颗粒物数量排放(PN)、质量排放(PM)分别在车速为25,30 km/h降幅最大;瞬态工况下,随着加速度的增加,PN、PM排放率降幅逐渐增大;颗粒粒径分布规律不同,安装前呈单峰或双峰分布,而安装后呈三峰分布,粒径124.1 nm左右降幅最大。 相似文献
265.
Effects of photodegradation of dissolved organic matter on the binding of benzo(a)pyrene 总被引:2,自引:0,他引:2
Dissolved organic matter (DOM) in natural waters can bind various organic pollutants, and the affinity of this binding is strongly influenced by the chemical characteristics of the DOM and water pH. This study examined the effects of photochemically induced alteration of the DOM's chemical properties and water pH on the binding of benzo(a)pyrene (BaP). Time- and pH-series of solar-simulated irradiations were performed on a natural water sample and aqueous DOM solutions prepared from aquatic and soil humic substances. The binding affinity of BaP, expressed as a partition coefficient of a compound to DOM, decreased substantially after the DOM samples were irradiated over environmentally relevant radiation doses and pH ranges. The lowering of the pH due to the photoproduction of acidic products often partly offsets the reduction of the binding affinity caused by direct photoalteration of the DOM's chemical structure. The decrease of the binding affinity, after correction for the photoinduced pH change, was positively correlated with the decrease in the molecular weight and the aromaticity of the DOM in the course of irradiation. Increasing O(2) abundance accelerated the decrease of the binding affinity as a result of enhanced DOM photodegradation. Visible light played a more important role in reducing the molecular weight and aromaticity of the DOM than in reducing the content of dissolved organic carbon (DOC) via photoremineralization while the reverse was true for UV radiation, indicating that photochemical reduction of the binding affinity may occur in natural waters at depths greater than UV radiation can reach. A decrease of the affinity of DOM for binding BaP will increase the free dissolved fraction of BaP and thus its availability and toxicity to aquatic organisms. The results from this study may have similar implications for organic pollutants other than BaP. 相似文献
266.
The primary purpose of this study was to investigate the effect of a catalyzed continuously regenerating trap(CCRT)system composed of a diesel oxidation catalyst(DOC)and a catalyzed diesel particulate filter(CDPF)on the main gaseous and particulate emissions from an urban diesel bus,as well as the durability performance of the CCRT system.Experiments were conducted based on a heavy chassis dynamometer,and a laboratory activity test as well as X-ray photoelectron spectroscopy(XPS)test were applied to evaluate the changes of the aged CCRT catalyst.Results showed that the CCRT could reduce the CO by 71.5%and the total hydrocarbons(THC)by 88.9%,and meanwhile promote the oxidation of NO.However,the conversion rates for CO and THC dropped to 25.1%and 55.1%,respectively,after the CCRT was used for one year(~60,000 km),and the NO oxidation was also weakened.For particulate emissions,the CCRT could reduce 97.4%of the particle mass(PM)and almost 100%of the particle number(PN).The aging of the CCRT resulted in a reduced PM trapping efficiency but had no observable effect on the PN;however,it increased the proportion of nucleation mode particles.The activity test results indicated that the deterioration of the CCRT was directly relevant to the increase in the light-off temperatures of the catalyst for CO,C_3H_8 and NO_2.In addition,the decreased concentrations of the active components Pt~(2+) and Pt~(4+) in the catalyst are also important factors in the CCRT deterioration. 相似文献
267.
Preparation and Adsorption Performance of Nano-hydroxyapatite-Enhanced Acrylamide Hydrogel Adsorbent
Wang Zhi-Ke Li Ting-Ting Peng Hao-Kai Ren Hai-Tao Lou Ching-Wen Lin Jia-Horng 《Journal of Polymers and the Environment》2022,30(7):2919-2927
Journal of Polymers and the Environment - In this study, a hydrogel adsorbent was successfully synthesized using hydroxyapatite/acrylamide/β-cyclodextrin to adsorb heavy metal ions and dyes in... 相似文献