全文获取类型
收费全文 | 169篇 |
免费 | 1篇 |
国内免费 | 6篇 |
专业分类
安全科学 | 5篇 |
废物处理 | 10篇 |
环保管理 | 8篇 |
综合类 | 17篇 |
基础理论 | 27篇 |
污染及防治 | 66篇 |
评价与监测 | 33篇 |
社会与环境 | 10篇 |
出版年
2023年 | 6篇 |
2022年 | 15篇 |
2021年 | 13篇 |
2020年 | 4篇 |
2019年 | 4篇 |
2018年 | 5篇 |
2017年 | 9篇 |
2016年 | 8篇 |
2015年 | 13篇 |
2014年 | 10篇 |
2013年 | 24篇 |
2012年 | 6篇 |
2011年 | 9篇 |
2010年 | 9篇 |
2009年 | 4篇 |
2008年 | 12篇 |
2007年 | 7篇 |
2006年 | 6篇 |
2005年 | 4篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1984年 | 1篇 |
1980年 | 2篇 |
排序方式: 共有176条查询结果,搜索用时 31 毫秒
121.
The concentrations of criteria air pollutants such as CO, NOx (NO + NO2), SO2 and PM were measured in the period of May 2001 and April 2003 in the city of Bursa, Turkey. The average concentrations for
this period were 1115±1600 μg/m3, 29±50 μg/m3, 51±24 μg/m3, 79±65 μg/m3, 40±35 μg/m3, 98±220 μg/m3, for CO, NO, NO2, NOx, SO2 and PM, respectively. Temporal changes in concentrations were analyzed using meteorological factors. Correlations among pollutant
concentrations and meteorological parameters showed weak relations nearly in all data. Lower concentrations were observed
in the summer months while higher concentrations were measured in the winter months. The increase in winter concentrations
was probably due to residential heating. Pollutants were associated with each other in order to have information about their
origin. NOx/SO2 ratio was also examined to bring out the source origin contributing on air pollution (i.e., traffic or stationary). 相似文献
122.
Optimum operating conditions for sewage treatment via combined biological-physico chemical treatment has been studied. The biological unit was a trickling filter. The non-settled biological effluent was subjected to coagulation followed by rapid solid-liquid separation via dissolved air flotation. The impact of organic load on the over-all efficiency of the system has been investigated using three different organic loads namely, 9.48, 20.0, and 27.85 g BOD5m?2d?1. The coagulants used were ferric chloride and alum. Calcium oxide was used as a coagulant aid with ferric chloride. Factors affecting the efficiency of dissolved air flotation process such as detention time, air solids ratio, and position of coagulant's addition have been investigated. The results obtained showed that the use of biological, extended physico-chemical technique leads to the removal of organic as well as inorganic contaminants. Moreover, sludge with high solids content can be obtained. 相似文献
123.
Recep Ekiciler Muhammet Samet Ali Çetinkaya Kamil Arslan 《International Journal of Green Energy》2020,17(10):555-567
ABSTRACT Al2O3/water nanofluid has been numerically examined for the first time with different nanoparticle shapes including, cylindrical, blade, brick, platelet and spherical, on the flat and triangular-corrugated impinging surfaces. The volume fractions of 1.0%, 2.0% and 3.0% nanoparticles have been used. The Reynolds number is between 100–500 depending on the slot diameter. The finite volume method is utilized to determine the governing equations. The study is analyzed to determine how the flow features, heat transfer features and entropy production were affected by the diversity of nanoparticle shape, nanoparticle volume fraction, and shape of impinging surface. Darcy friction factor and Nusselt number are studied in detail for different conditions. The temperature contours are presented in the case of different nanoparticle volume fractions, nanoparticle shapes and both impinging surfaces. The results of the study suggest that the nanoparticle shape of the platelet shows the highest heat transfer development due to the thinner thermal boundary layer. Heat transfer augments with increasing volume fraction of nanoparticles. In addition, the study is consistent with the results of the literature on heat transfer and flow properties. 相似文献
124.
In order to understand its response towards nickel stress, watercress (Nasturtium o cinale R. Br.) was exposed to nickel (1–25 mg/L)
for 1, 3, 5 and 7 days. The accumulation and translocation of nickel were determined and the influence of nickel on biomass, protein
content and enzymatic antioxidants was examined for both roots and leaves. It was determined that N. o cinale could accumulate
appreciable amounts of Ni in both roots and leaves. Nickel accumulated particularly in the roots of plants. Biomass increased at low
nickel concentrations but certain measurable change was not found at high concentrations. Under stress conditions the antioxidant
enzymes were up-regulated compared to control. An increase in protein content and enzyme activities was observed at moderate
exposure conditions followed by a decline at both roots and leaves. The maximum enzyme activities were observed at di erent exposure
conditions. Our results showed that N. o cinale had the capacity to overcome nickel-induced stress especially at moderate nickel
exposure. Therefore, N. o cinale may be used as a phytoremediator in moderately polluted aquatic ecosystems. 相似文献
125.
In order to understand its response towards nickel stress,watercress(Nasturtium officinale R.Br.) was exposed to nickel(1-25 mg/L) for 1,3,5 and 7 days.The accumulation and translocation of nickel were determined and the influence of nickel on biomass,protein content and enzymatic antioxidants was examined for both roots and leaves.It was determined that N.officinale could accumulate appreciable amounts of Ni in both roots and leaves.Nickel accumulated particularly in the roots of plants.Biomass increased at low nickel concentrations but certain measurable change was not found at high concentrations.Under stress conditions the antioxidant enzymes were up-regulated compared to control.An increase in protein content and enzyme activities was observed at moderate exposure conditions followed by a decline at both roots and leaves.The maximum enzyme activities were observed at different exposure conditions.Our results showed that N.officinale had the capacity to overcome nickel-induced stress especially at moderate nickel exposure.Therefore,N.officinale may be used as a phytoremediator in moderately polluted aquatic ecosystems. 相似文献
126.
Samet Mariem Karray Fatma Mhiri Najla Kamoun Lotfi Sayadi Sami Gargouri-Bouzid Radhia 《Environmental science and pollution research international》2019,26(21):21404-21415
Environmental Science and Pollution Research - Phosphoric acid production and olive oil production are among the most important economical sectors in Tunisia. However, they generate huge amounts of... 相似文献
127.
Abuzer Çelekli Fadime Çelekli Erdoğan Çiçek Hüseyin Bozkurt 《Environmental science and pollution research international》2014,21(7):5086-5097
The use of effective disposal of redundant pumpkin husk (PH) to remove pollutants is an important issue for environmental protection and utilization of resource. The aim of this study was to remove a potentially toxic reactive azo dye, Reactive Red (RR) 120, by widespread PH as a low-cost adsorbent. Particle size, adsorbent dose, pH, temperature, initial dye concentration, and contact time affected the sorption process. Amine, amide, hydroxyl, and carboxyl groups of PH played significant roles on the sorption process. Rapid sorption occurred within the first 2 min and equilibrium was reached within 60 min. Sorption kinetic was well represented by logistic equation. Generated secondary logistic model can be used to describe effects of initial dye concentration, contact time, and temperature by a single equation with high R 2 value. Monolayer sorption capacity was found as 98.61 mg g-1. Activation energy, thermodynamic, and desorption studies showed that this process was physical, endothermic, and spontaneous. This study indicated that redundant PH as a low-cost adsorbent had a great potential for the removal of RR 120 as an alternative eco-friendly process. 相似文献
128.
Burkhard O. Wagner Elham Refaat Abdel Aziz Anja Schwetje Fatma Abou Shouk Juliane Koch-Jugl Michael Braedt Keya Choudhury Roland Weber 《Environmental science and pollution research international》2013,20(4):2087-2097
The sustainable management of chemicals and their associated wastes—especially legacy stockpiles—is always challenging. Developing countries face particular difficulties as they often have insufficient treatment and disposal capacity, have limited resources and many lack an appropriate and effective regulatory framework. This paper describes the objectives and the approach of the Egyptian–German Twinning Project under the European Neighbourhood Policy to improve the strategy of managing hazardous substances in the Egyptian Environmental Affairs Agency (EEAA) between November 2008 and May 2011. It also provides an introduction to the Republic of Egypt’s legal and administrative system regarding chemical controls. Subsequently, options for a new chemical management strategy consistent with the recommendations of the United Nations Chemicals Conventions are proposed. The Egyptian legal and administrative system is discussed in relation to the United Nations’ recommendations and current European Union legislation for the sound management of chemicals. We also discuss a strategy for the EEAA to use the existing Egyptian legal system to implement the United Nations’ Globally Harmonized System of Classification and Labelling of Chemicals, the Stockholm Convention and other proposed regulatory frameworks. The analysis, the results, and the recommendations presented may be useful for other developing countries in a comparable position to Egypt aspiring to update their legislation and administration to the international standards of sound management of chemicals. 相似文献
129.
130.
As in vivo system, we propose Drosophila melanogaster as a useful model for study the genotoxic risks associated with nanoparticle exposure. In this study we have carried out a genotoxic evaluation of titanium dioxide (TiO2), zirconium oxide (ZrO2) and aluminium oxide (Al2O3) nanoparticles and their microparticulated forms in D. melanogaster by using the wing somatic mutation and recombination assay. This assay is based on the principle that loss of heterozygosis and the corresponding expression of the suitable recessive markers, multiple wing hairs and flare-3, can lead to the formation of mutant clones in treated larvae, which are expressed as mutant spots on the wings of adult flies. Third instar larvae were feed with TiO2, ZrO2 and Al2O3 nanoparticles, and their microparticulated forms, at concentrations ranging from 0.1 to 10 mM. Although a certain level of aggregation/agglomeration was observed in solution, it must be noted than the constant digging activity of larvae ensures that treated medium pass constantly through the digestive tract ensuring exposure. The results showed that no significant increases in the frequency of all spots (e.g. small single, large single, twin, total mwh and total spots) were observed, indicating that these nanoparticles were not able to induce genotoxic activity in the wing spot assay of D. melanogaster. Negative data were also obtained with the microparticulated forms. This indicates that the nanoparticulated form of the selected nanomaterials does not modify the potential genotoxicity of their microparticulated versions. These in vivo results contribute to increase the genotoxicity database on the TiO2, ZrO2 and Al2O3 nanoparticles. 相似文献