全文获取类型
收费全文 | 163篇 |
免费 | 4篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 4篇 |
环保管理 | 21篇 |
综合类 | 23篇 |
基础理论 | 43篇 |
环境理论 | 1篇 |
污染及防治 | 53篇 |
评价与监测 | 8篇 |
社会与环境 | 12篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 4篇 |
2022年 | 8篇 |
2021年 | 8篇 |
2020年 | 6篇 |
2019年 | 8篇 |
2018年 | 8篇 |
2017年 | 6篇 |
2016年 | 12篇 |
2015年 | 5篇 |
2014年 | 10篇 |
2013年 | 12篇 |
2012年 | 6篇 |
2011年 | 8篇 |
2010年 | 6篇 |
2009年 | 11篇 |
2008年 | 8篇 |
2007年 | 14篇 |
2006年 | 3篇 |
2005年 | 3篇 |
2004年 | 4篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 1篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1981年 | 1篇 |
排序方式: 共有169条查询结果,搜索用时 15 毫秒
81.
82.
Robert B. Kehew Mthobeli Kolisa Christopher Rollo Alejandro Callejas Gotelind Alber Liana Ricci 《Local Environment》2013,18(6):723-737
Faced with the prospects of a changing climate, a small but increasing number of countries are developing legal and regulatory frameworks that explicitly address climate change. Moreover at least some of these laws and policies carve out substantial roles for local governments. The present paper surveys three countries from different regions in the Global South that have developed or are developing such laws and policies: the Philippines (Asia-Pacific), Mexico and more specifically its State of Chiapas (Latin America), and South Africa (Africa). It examines those experiences through two different lenses. The paper first reviews the steps by which those laws or policies were developed. For this review, criteria for effective consultative processes are proposed. The study then examines the three climate change laws or policies per se. To this end, a framework including four modes of multi-level urban climate governance (governing by regulation, governing through enabling, governing by provision, governing with representation and consultation) is utilised. The paper ends with synthetic conclusions as to which experiences represent promising practices, and what other lessons are relevant for countries embarking on such processes. 相似文献
83.
Nolasco Maria E. Lemos Viviane A. S. López Gina Soares Sandra A. Feitosa Johnny P. M. Araújo Bruno S. Ayala Alejandro P. de Azevedo Marleane M. F. Santos Francisco E. P. Cavalcante Rivelino M. 《Journal of Polymers and the Environment》2022,30(7):2862-2874
Journal of Polymers and the Environment - The aim of the present study was to perform morphological and chemical characterizations of microplastics (MPs) found in seawater samples from the coast of... 相似文献
84.
The use of column experiments, usually performed to better approximate field conditions, may provide information that is not available from batch experiments. In such experiments heavy metals are often adsorbed until saturation followed by desorption experiments. When the affinity of the metal to soil is high, the retention factor (R) could be greater than thousands and the duration of experiments can become impractically long. In order to use reasonable laboratory time, the flow rate should be increased or the column size decreased. The increase in flow rate produces undesirable kinetic and dispersion effects, so we used very small soil columns (pore volume = 0.31–0.70 ml) and relatively high flow rates (0.03–0.12 ml min−1) in studies of Zn(II) adsorption and retention in soils. Conservative tracer flow column experiments under saturation conditions were carried out to determine flow parameters for different flow rates. Column pore volume (Vp), Peclet numbers (Pe) and longitudinal dispersion coefficients (DL) were determined from breakthrough curves. The effect of type of electrolyte and ionic strength on the Zn(II) retention onto soil was determined. The influence of flow rate and bed height on the retention coefficient and on the mass transfer zone was also studied. The effect of different influent Zn(II) concentrations on the R values obtained was analyzed. Freundlich parameters from column experiments were compared with batch ones. The leaching efficiency of different electrolytes, salts of weak organic acids and EDTA was also studied. 相似文献
85.
Alejandro Gutiérrez-Sarabia Georgina Fernandez-Villagómez Pedro Martínez-Pereda Noemí Rinderknecht-Seijas Héctor M Poggi-Varaldo 《Water environment research》2004,76(4):334-343
This work evaluated the performance of a full-scale system with wetlands for slaughterhouse (abattoir) effluent treatment in the State of Hidalgo, México. The treatment system consisted of a primary sedimentation tank, an anaerobic lagoon, and a constructed subsurface-flow wetland, in series. The wetland accounted for almost 30% of the removal of organic matter. In general, the treatment system achieved satisfactory pollutant removals, but the final effluent could not meet the Mexican environmental regulations for fecal coliform counts, five-day biochemical oxygen demand (BOD5), and total suspended solids (TSS). Overall, removal levels were 91%, 89%, and 85% for BOD5, chemical oxygen demand, and TSS, respectively. However, BOD5 in the final effluent (137 mg/L) was higher than the maximum level of 30 mg/L allowed by the regulatory agency. Although organic nitrogen removal levels were approximately 80%, the nitrogen persisted in oxidation state -3 as ammonia-nitrogen, the removal of which was only 9% in the wetland stage. On average, phosphorus removal was null, and, on occasion, the phosphorus concentration in the treated effluent was higher than that of the influent. Coliform reductions in the overall system were high (on the order of 5 logs on average), whereas the coliform removal in the wetland was between 2 to 3.5 logs. The treatment system was also effective at removing pathogens (Vibrio cholerae, Salmonella, and Shigella). Further laboratory tests with the wetland effluent suggest that post treatment in a sand filter stage followed by disinfection with sodium hypochlorite (NaOCl) could help meet the Mexican discharge regulations, particularly the criteria for coliforms and total BOD5. 相似文献
86.
87.
San Martin David Orive Mikel Martínez Ekaitz Iñarra Bruno Ramos Saioa González Nagore Guinea de Salas Alejandro Vázquez Luis Alberto Zufía Jaime 《Environmental science and pollution research international》2021,28(13):15716-15730
Environmental Science and Pollution Research - Approximately 33% of food produced around the world is wasted. In the distribution sector, erroneous orders or demand predictions result in products... 相似文献
88.
dos Santos Costa Rafaela Quadra Gabrielle Rabelo de Oliveira Souza Helena do Amaral Viviane Souza Navoni Julio Alejandro 《Environmental science and pollution research international》2021,28(31):41638-41650
Environmental Science and Pollution Research - Cyanobacteria are important for ecosystem functioning, but eutrophication may affect the surrounding biome by losing ecosystem services and/or through... 相似文献
89.
90.
Christofer Troedsson Jean-Marie Bouquet Carla M. Lobon Aliona Novac Jens C. Nejstgaard Sam Dupont Suncica Bosak Hans H. Jakobsen Nadezda Romanova Lene M. Pankoke Alejandro Isla Jörg Dutz Andrey F. Sazhin Eric M. Thompson 《Marine Biology》2013,160(8):2175-2187
Increasing pCO2 is hypothesized to induce shifts in plankton communities toward smaller cells, reduced carbon export rates and increased roles of gelatinous zooplankton. Appendicularians, among the most numerous pan-global “gelatinous” zooplankton, continuously produce filter-feeding houses, shortcutting marine food webs by ingesting submicron particles, and their discarded houses contribute significantly to carbon fluxes. We present a first mesocosm-scale study on the effects of temperature, pCO2 and bloom structures on the appendicularian, Oikopleura dioica. There were effects of temperature and nutrients on phytoplankton communities. No shifts in functional phytoplankton groups, nor changes in particle sizes/morphotypes, known to impact appendicularian feeding, were observed under manipulated pCO2 conditions. However, appendicularian abundance was positively correlated with increased pCO2, temperature and nutrient levels, consistent with hypotheses concerning gelatinous zooplankton in future oceans. This suggests appendicularians will play more important roles in marine pelagic communities and vertical carbon transport under projected ocean acidification and elevated temperature scenarios. 相似文献