全文获取类型
收费全文 | 707篇 |
免费 | 5篇 |
国内免费 | 5篇 |
专业分类
安全科学 | 10篇 |
废物处理 | 51篇 |
环保管理 | 48篇 |
综合类 | 82篇 |
基础理论 | 149篇 |
污染及防治 | 258篇 |
评价与监测 | 69篇 |
社会与环境 | 48篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 8篇 |
2022年 | 42篇 |
2021年 | 38篇 |
2020年 | 16篇 |
2019年 | 13篇 |
2018年 | 43篇 |
2017年 | 31篇 |
2016年 | 47篇 |
2015年 | 21篇 |
2014年 | 39篇 |
2013年 | 64篇 |
2012年 | 48篇 |
2011年 | 64篇 |
2010年 | 29篇 |
2009年 | 21篇 |
2008年 | 42篇 |
2007年 | 45篇 |
2006年 | 27篇 |
2005年 | 25篇 |
2004年 | 14篇 |
2003年 | 11篇 |
2002年 | 10篇 |
2001年 | 9篇 |
1999年 | 2篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1979年 | 1篇 |
1967年 | 1篇 |
1964年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有717条查询结果,搜索用时 15 毫秒
131.
Eva Friis Møller Christian Marc Andersen Borg Sigrún H. Jónasdóttir Suree Satapoomin Cornelia Jaspers Torkel Gissel Nielsen 《Marine Biology》2011,158(3):677-688
The vertical distribution of copepods, fecal pellets and the fecal pellet production of copepods were measured at seven stations
across the Southern Indian Ocean from productive areas off South Africa to oligotrophic waters off Northern Australia during
October/November 2006. We quantified export of copepod fecal pellet from surface waters and how much was retained. Furthermore,
the potential impact of Oncaea spp. and harpacticoid copepods on fecal pellets degradation was evaluated and found to be regional substantial. The highest
copepod abundance and fecal pellet production was found in the western nutrient-rich stations close to South Africa and the
lowest at the central oligotrophic stations. The in situ copepod fecal pellet production varied between 1 and 1,000 μg C m−3 day−1. At all stations, the retention of fecal pellets in the upper 400 m of the water column was more than 99% and the vertical
export of fecal pellets was low (<0.02 mg m−2 day−1). 相似文献
132.
Understanding the conditions that force the implementation of management actions and their efficiency is crucial for conservation of endangered species. Wildlife managers are widely and increasingly using food supplementation for such species because the potentially immediate benefits may translate into rapid conservation improvements. Supplementary feeding can also pose risks eventually promoting undesired, unexpected, subtle, or indirect, and often unnoticed, effects that are generally poorly understood. For two decades, intensive food supplementation has been used in attempting to improve the breeding productivity of the Spanish Imperial Eagle, Aquila adalberti, one of the most endangered birds of prey in the world. Here, we examined the impact of this intensive management action on nestling health, including contamination, immunodepression, and acquisition of disease agents derived from supplementation techniques and provisioned food. Contrary to management expectations, we found that fed individuals were often inadvertently "medicated" with pharmaceuticals (antibiotics and antiparasitics) contained in supplementary food (domestic rabbits). Individuals fed with medicated rabbits showed a depressed immune system and a high prevalence and richness of pathogens compared with those with no or safe supplementary feeding using non-medicated wild rabbits. A higher presence of antibiotics (fluoroquinolones) was found in sick as opposed to healthy individuals among eaglets with supplementary feeding, which points directly toward a causal effect of these drugs in disease and other health impairments. This study represents a telling example of well-meaning management strategies not based on sound scientific evidence becoming a "contraindicated" action with detrimental repercussions undermining possible beneficial effects by increasing the impact of stochastic factors on extinction risk of endangered wildlife. 相似文献
133.
Jasmin Shah M. Rasul Jan Farhat-un-nisa Shehzad Behisht Ara 《Environmental monitoring and assessment》2011,175(1-4):103-108
A method for the residual pendimethalin in soil and vegetable samples was developed. The method is based on extraction of pendimethalin from samples using microwave-assisted solvent extraction (MASE) with acetone, ethanol, and water as extraction solvent. Extracted pendimethalin samples were analyzed by high-performance liquid chromatography with ultraviolet detector at 240 nm. The MASE parameters, temperature, heating time, and solvent types were optimized with the feasibility of MASE application in the determination of pendimethalin extraction efficiency of pendimethalin from soil and vegetable samples. The maximum temperature that can be used during the heating for MASE is 60°C, where the recovery percentages reached 97%. Linearity for pendimethalin was found in the range of 2?C20 ??g mL???1 with limits of detection and limits of quantification of 0.059 and 0.17 ??g mL???1, respectively. 相似文献
134.
Alberto Megías Antonio Maldonado Andrés Catena Leandro L. Di Stasi Jesús Serrano Antonio Cándido 《Safety Science》2011,49(10):1388-1393
In road safety literature the effects of emotional content and salience of advertising billboards have been scarcely investigated. The main aim of this work was to uncover how affect-laden roadside advertisements can affect attention – eye-movements – and subsequent risky decisions – braking – on the Honda Riding Trainer motorcycle simulator. Results indicated that the number of fixations and total fixation time elicited by the negative and positive emotional advertisements were larger than the neutral ones. At the same time, negative pictures got later gaze disengagement than positive and neutral ones. This attentional capture results in less eye fixation times on the road relevant region, where the important driving events happen. Finally, the negative emotional valence advertisements sped up braking on subsequent risky situations. Overall results demonstrated how advertisements with emotional content modulate attention allocation and driving decisions in risky situations and might be helpful for designing roadside advertisements regulations and risk prevention programs. 相似文献
135.
Rosa María Arnaldo Valdés Fernando Gómez Comendador Luis Mijares Gordún Francisco J. Sáez Nieto 《Safety Science》2011,49(5):633-650
The risks of landing overrun (LDOR – LanDing OverRun), Take-off Overrun (TOOR – Take-Off OverRun) and landing undershoot (LDUS – LanDing UnderShoot) are dependent on multiple factors related to operating conditions. These include wind, runway surface conditions, landing or take-off distances required, the presence of obstacles, runway distance available, the existence and dimensions of runway safety areas.In this paper we propose risk models for runway overrun and landing undershoot, using a probabilistic approach. These models are supported by historical data on accidents in the area around the runway and will enable us to determine if the risk level is acceptable or whether action must be taken to mitigate such risks at a given airport. Furthermore, these models permit comparison of the results of different risk mitigation actions in terms of operational risk and safety.The principal advantage of this method is the high quality results obtained for a limited investment in terms of time, computing power and data. As such the method is extremely practical and easy to apply in aerodrome planning, development and operation. 相似文献
136.
Raspini Jéssica Prats Bonfante Mariele Canal Cúnico Franciele Rossetti Alarcon Orestes Estevam Campos Lucila M. S. 《Journal of Material Cycles and Waste Management》2022,24(5):1747-1759
Journal of Material Cycles and Waste Management - The transition from the current linear to a circular economy (CE) is a great challenge, especially in industries where the theme was barely... 相似文献
137.
Guimarães Tábata C. Araújo Everton S. Hernández-Macedo María Lucila López Jorge A. 《Journal of Polymers and the Environment》2022,30(7):2669-2684
Journal of Polymers and the Environment - In recent decades, the global accumulation of plastics and the resulting pollution, as well as the increase in the price of oil, have driven studies aimed... 相似文献
138.
Soares Jéssica Maria Alexandre da Silva Júnior Elenildo Dário Oliveira de Veras Bruno Yara Ricardo de Albuquerque Priscilla Barbosa Sales de Souza Marthyna Pessoa 《Journal of Polymers and the Environment》2022,30(1):217-231
Journal of Polymers and the Environment - Bioactive biodegradable films are emerging biomaterials in the food packaging field. This study aims to investigate the effect of different Cenostigma... 相似文献
139.
Gomes Brener Felipe Melo Lima de Araújo Caroline Maria Bezerra do Nascimento Bruna Figueiredo Freire Eleonora Maria Pereira de Luna Da Motta Sobrinho Mauricio Alves Carvalho Marilda Nascimento 《Environmental science and pollution research international》2022,29(12):17358-17372
Environmental Science and Pollution Research - In this work, graphene oxide (GO) was synthesized by the modified Hummers method. The nanomaterial was characterized by FTIR and Raman spectroscopy,... 相似文献
140.
Mohos Violetta Faisal Zelma Fliszár-Nyúl Eszter Szente Lajos Poór Miklós 《Environmental science and pollution research international》2022,29(1):210-221
Environmental Science and Pollution Research - Mycotoxins are toxic metabolites of filamentous fungi; they are common contaminants in numerous foods and beverages. Cyclodextrins are ring-shaped... 相似文献