全文获取类型
收费全文 | 904篇 |
免费 | 51篇 |
国内免费 | 141篇 |
专业分类
安全科学 | 41篇 |
废物处理 | 46篇 |
环保管理 | 72篇 |
综合类 | 353篇 |
基础理论 | 212篇 |
污染及防治 | 231篇 |
评价与监测 | 60篇 |
社会与环境 | 59篇 |
灾害及防治 | 22篇 |
出版年
2024年 | 3篇 |
2023年 | 17篇 |
2022年 | 55篇 |
2021年 | 34篇 |
2020年 | 45篇 |
2019年 | 41篇 |
2018年 | 31篇 |
2017年 | 47篇 |
2016年 | 63篇 |
2015年 | 44篇 |
2014年 | 70篇 |
2013年 | 74篇 |
2012年 | 55篇 |
2011年 | 78篇 |
2010年 | 50篇 |
2009年 | 54篇 |
2008年 | 49篇 |
2007年 | 42篇 |
2006年 | 31篇 |
2005年 | 29篇 |
2004年 | 20篇 |
2003年 | 18篇 |
2002年 | 21篇 |
2001年 | 18篇 |
2000年 | 20篇 |
1999年 | 8篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1996年 | 5篇 |
1995年 | 8篇 |
1994年 | 6篇 |
1993年 | 6篇 |
1992年 | 2篇 |
1991年 | 5篇 |
1990年 | 7篇 |
1989年 | 7篇 |
1988年 | 5篇 |
1986年 | 3篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1978年 | 2篇 |
1976年 | 2篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1972年 | 1篇 |
1954年 | 1篇 |
1922年 | 1篇 |
排序方式: 共有1096条查询结果,搜索用时 156 毫秒
961.
962.
The temporal changes in road stormwater runoff quality and the implications to first flush control in Chongqing, China 总被引:1,自引:0,他引:1
Qianqian Zhang Xiaoke Wang Peiqiang Hou Wuxing Wan Yufen Ren Zhiyun Ouyang Le Yang 《Environmental monitoring and assessment》2013,185(12):9763-9775
This study investigates the quality of stormwater runoff from a driveway in the southwest mountainous urban area of Chongqing, China, from 2010 to 2011. The results showed that the mean concentrations of chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) were 4.1, 2.4, and 2.2 times the grade V levels of the national surface water standard of China. The pollutant concentration peak preceded or synchronized with the rainfall intensity peak and occurred 10 min after the runoff started. The significant high pollutant concentration in the initial stage of the rainfall suggested that first flush control is necessary, especially for the most polluted constitutes, such as total suspended solids, COD, and TN. Three potential pollution sources were identified: the atmospheric dry and wet deposition (TN, NO3 ?-N, NH4 +-N, and DCu), the road sediment and materials (total suspended solids, COD, and TP), and the vehicle emissions (DPb and DZn). Therefore, this study indicates that reductions in road sediments and material pollution and dry and wet deposition should be the priority factors for pollution control of road stormwater runoff in mountainous urban areas. 相似文献
963.
Aitor Aizpuru Luc Malhautier Jean-Claude Roux Jean-Louis Fanlo 《Journal of the Air & Waste Management Association (1995)》2013,63(12):1662-1670
ABSTRACT Air biofiltration is now under active consideration for the removal of the volatile organic compounds (VOCs) from polluted airstreams. To optimize this emerging environmental technology and to understand compound removal mechanisms, a biofilter packed with peat was developed to treat a complex mixture of VOCs: oxygenated, aromatic, and chlorinated compounds. The removal efficiency of this process was high. The maximum elimination capacity (ECmax) obtained was ~120 g VOCs/m3 peat/hr. Referring to each of the mixture's components, the ECmax showed the limits in terms of biodegradability of VOCs, especially for the halogenated compounds and xylene. A stratification of biodegradation was observed in the reactor. The oxygenated compounds were metabolized before the aromatic and halogenated ones. Two assumptions are suggested. There was a competition between bacterial communities. Different communities colonized the peat-based biofilter, one specialized for the elimination of oxygenated compounds, the others more specialized for elimination of aromatic and halogenated compounds. There was also substrate competition. Bacterial communities were the same over the height of the column, but the more easily biodegradable compounds were used first for the microorganism metabolism when they were present in the gaseous effluent. 相似文献
964.
Julien Guigue Olivier Mathieu Jean Lévêque Sophie Denimal Marc Steinmann Marie-Jeanne Milloux Hervé Grisey 《Waste management (New York, N.Y.)》2013,33(11):2287-2295
This study characterises the sediment dredged from a lagooning system composed of a settling pond and three lagoons that receive leachates from a municipal solid waste (MSW) landfill in France. Organic carbon, carbonate, iron oxyhydroxides, copper (Cu) and zinc (Zn) concentrations were measured in the sediment collected from upstream to downstream in the lagooning system. In order to complete our investigation of sedimentation mechanisms, leachates were sampled in both dry (spring) and wet (winter) seasonal conditions. Precipitation of calcite and amorphous Fe-oxyhydroxides and sedimentation of organic matter occurred in the settling pond. Since different distributions of Zn and Cu concentrations are measured in sediment samples collected downstream in the lagooning system, it is suggested that these elements were not distributed in a similar way in the leachate fractions during the first stage of treatment in the settling pond, so that their sedimentation dynamics in the lagooning system differ. In the lagoons, it was found that organic carbon plays a major role in Cu and Zn mobility and trapping. The presence of macrophytes along the edges provided an input of organic matter that enhanced Cu and Zn scavenging. This edge effect resulted in a two-fold increase in Cu and Zn concentrations in the sediment deposited near the banks of the lagoons, thus confirming the importance of vegetation for the retention of Cu and Zn in lagooning systems. 相似文献
965.
966.
Johan Gardères Laure Taupin Jasnizat Bin Sa?din Alain Dufour Ga?l Le Pennec 《Marine Biology》2012,159(8):1685-1692
Many bacteria live in close association with sponges. Within these consortia, molecules of communication such as quorum-sensing and hormone-like molecules may occur in order to regulate the partnership. Of particular interest, bacterial N-acyl-l-homoserine lactones (AHLs) were screened in supernatants from Suberites domuncula-associated bacteria using an E. coli bioluminescent reporter system. These sponge-associated bacteria were beforehand isolated on several media supplemented or not with a sponge extract to attempt to isolate sponge-specific bacteria. Out of 81 AHL-producing bacteria, three strains requiring sponge extract to grow were selected for AHL characterization. The in vitro produced AHLs, that is, in bacterial culture supernatants, were identified as N-(3-butanoyl)-l-homoserine lactone and N-(3-oxododecanoyl)-l-homoserine lactone and quantified using LC–ESI–MS/MS. The in vivo production of AHLs by sponge-associated bacteria has also been demonstrated in a healthy host for the first time: N-(3-oxododecanoyl)-l-homoserine lactone, N-(3-hexanoyl)-l-homoserine lactone, and N-(3-heptanoyl)-l-homoserine lactone. This AHL production in sponges may suggest a potential role of these molecules between sponge-associated bacteria and/or between sponge-associated bacteria and the sponge. 相似文献
967.
面对纷繁复杂的环境纠纷,学者们普遍倾向行政调解,但实践中行政调解存在概念不清、程序不完备、政府信誉危机等无法逾越的障碍。为了应对复杂的环境纠纷,应当因应地选择解决方式,确立“二一分流”的方法并创设“双调解”模式,将不同类型的问题划入不同处理模式,综合运用三大调解方式,从而真正实现“大调解”从司法到全社会的全面贯通,提高环境纠纷处理效率。 相似文献
968.
C. Le Caignec C. Gicquel M. C. Gubler C. Guyot M. C. You A. Laurent M. Joubert N. Winer A. David J. M. Rival 《黑龙江环境通报》2004,24(3):165-168
Beckwith–Wiedemann syndrome (BWS) is an overgrowth syndrome associated with congenital malformations and tumour predisposition. BWS results from variable mutations or epigenetic modifications of imprinted genes in the 11p15 chromosomal region. We present a fetus with mild general overgrowth and bilateral enlarged echogenic kidneys with loss of the corticomedullary differentiation in which prenatal diagnosis of BWS was suspected. The rest of the fetal anatomy and the amniotic fluid volume appeared normal. After termination of the pregnancy, molecular analysis confirmed the diagnosis of BWS by showing an isolated hypermethylation of the H19 gene. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
969.
An unusual correlation has been observed between the amylase and trypsin content of a natural zooplankton population and of the hyponeustonic copepod Anomalocera patersoni and the oil spill of the Amoco Cadiz in 1978. This anomaly has also been observed in Artemia sp. cultures (San Francisco Bay strain) poisoned by copper. This phenomenon could originate from a general physiological perturbation. Such a non-specific perturbation could explain the anormal correlation between parameters which are usually independent and specifically regulated. The determination of such anomalous regulation could lead to detection of the sublethal effect of pollutants in the field. The method requires no prior knowledge of the area and can be applied for detection of a new perturbation; in fact, if organisms adapt to the new conditions, the anomaly disappears. The method has enabled physiological perturbations of zooplankton to be recorded 1 yr after the Amoco Cadiz oil spill. The hyponeustonic copepod Anomalocera patersoni was particularly perturbed, even at residual hydrocarbon concentrations usually considered by chemists as approaching normal values. 相似文献
970.
The coasts of the Gulf of Mexico are zones exposed to the exploration and exploitation of petroleum sources, and the products generated in agricultural zones may become contaminated by persistent organic pollutants (POPs). The objective of the present study was to evaluate the presence of polychlorinated biphenyl compounds (PCBs) in milk from dairy production units near sources of environmental pollutants. It was confirmed that the seven congeners of nondioxin-like PCBs (NDL-PCBs) are present in milk where compounds PCB101, PCB118, PCB153 and PCB180 appear in 100% of the samples analyzed, the rank of concentration for the sum of the seven congeners fluctuating between 2.6 and 26 ng g−1 with a median of 6 ng g−1. None of the samples surpassed the provisional value established by the EU of 40 ng g−1 of milk fat for the sum of the seven congeners, indicator that was not affected by the season of the year (p < 0.05), whose median of 8.6 ng g−1 and 6.3 ng g−1 for rain and drought respectively. The concentrations of NDL-PCBs found in milk do not represent a problem for human health; however, they alert the existence of spontaneously generated, uncontrolled sources that may represent a potential danger for human and animal health. 相似文献