全文获取类型
收费全文 | 2252篇 |
免费 | 44篇 |
国内免费 | 24篇 |
专业分类
安全科学 | 78篇 |
废物处理 | 127篇 |
环保管理 | 198篇 |
综合类 | 459篇 |
基础理论 | 397篇 |
环境理论 | 1篇 |
污染及防治 | 654篇 |
评价与监测 | 242篇 |
社会与环境 | 136篇 |
灾害及防治 | 28篇 |
出版年
2023年 | 21篇 |
2022年 | 45篇 |
2021年 | 66篇 |
2020年 | 33篇 |
2019年 | 35篇 |
2018年 | 88篇 |
2017年 | 76篇 |
2016年 | 98篇 |
2015年 | 76篇 |
2014年 | 111篇 |
2013年 | 166篇 |
2012年 | 90篇 |
2011年 | 144篇 |
2010年 | 106篇 |
2009年 | 109篇 |
2008年 | 137篇 |
2007年 | 119篇 |
2006年 | 94篇 |
2005年 | 80篇 |
2004年 | 90篇 |
2003年 | 102篇 |
2002年 | 71篇 |
2001年 | 72篇 |
2000年 | 43篇 |
1999年 | 28篇 |
1998年 | 21篇 |
1997年 | 13篇 |
1996年 | 9篇 |
1995年 | 16篇 |
1994年 | 18篇 |
1993年 | 20篇 |
1992年 | 20篇 |
1991年 | 3篇 |
1990年 | 7篇 |
1989年 | 6篇 |
1988年 | 7篇 |
1987年 | 2篇 |
1986年 | 6篇 |
1985年 | 9篇 |
1984年 | 6篇 |
1983年 | 9篇 |
1982年 | 10篇 |
1981年 | 6篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1976年 | 2篇 |
1970年 | 2篇 |
1962年 | 6篇 |
1961年 | 2篇 |
排序方式: 共有2320条查询结果,搜索用时 46 毫秒
951.
The industrial waste effluents from two industries of Durgapur have been traced along the course of Tamla Nalah at selected sites up to its confluence with the Damodar river and downstream. There are evidences of contamination of the river with toxic pollutants—ammonia, phenol, cyanide, sulphide, and trace mercury from Tamla Nalah. The upstream river water (Durgapur barrage), which is believed to be fairly pure, is actually not much better than the downstream river water. Monitoring data for about a year are presented and discussed. 相似文献
952.
Lopes Géssica de Oliveira Aragão Walessa Alana Bragança Nascimento Priscila Cunha Bittencourt Leonardo Oliveira Oliveira Ana Carolina Alves Leão Luana Ketlen Reis Alves-Júnior Sergio Melo Pinheiro João de Jesus Viana Crespo-Lopez Maria Elena Lima Rafael Rodrigues 《Environmental science and pollution research international》2021,28(9):10918-10930
Environmental Science and Pollution Research - This study aimed to investigate the effects of lead (Pb) exposure on parotid and submandibular glands through morphological aspects as well as the... 相似文献
953.
Motta Oriana Pironti Concetta Moccia Giuseppina De Caro Franceso 《Environmental science and pollution research international》2021,28(16):19537-19538
Environmental Science and Pollution Research - 相似文献
954.
Carvalho Thayane Ferreira Carvalho Aline Cristina Zanuncio José Cola de Oliveira Marcio Leles Romarco Machado Evandro Luiz Mendonça José Anderson Cleiton Santos José Barbosa Pereira Israel Marinho 《Environmental science and pollution research international》2022,29(10):14195-14205
Environmental Science and Pollution Research - Pteridium aquilinum (Dennstaedtiaceae) colonization affects ecological and restoration processes. The knowledge of the impacts on the ecological... 相似文献
955.
Isbasoiu Ancuta Jayet Pierre-Alain De Cara Stéphane 《Environmental Economics and Policy Studies》2021,23(2):409-440
Environmental Economics and Policy Studies - This study focuses on the links between food production and greenhouse gas emissions in the European Union. The analysis relies on two sets of... 相似文献
956.
Michael S. Tomlinson Eric H. De Carlo 《Journal of the American Water Resources Association》2003,39(1):113-123
ABSTRACT: Streams in the Hawaiian Islands differ from many streams on the U.S. mainland presenting unique challenges to investigators attempting to characterize Hawaiian streams. Hawaiian streams are short; watersheds are small and steep; and rain events are usually short in duration but intense. As a result, most streams in Hawai'i are flashy. Time scales for storm hydrographs in Hawai'i are on the order of hours instead of days and flash flooding is a common hazard. To characterize the streams we were investigating, we found it necessary to obtain streamflow and water quality measurements at relatively short time intervals. While this resolution resulted in large sometimes onerous quantities of data, we would have otherwise missed certain phenomena, such as 60‐fold flow changes in 15 minutes or 30‐fold turbidity changes in five minutes. Even at five‐minute intervals, we found that attempts to predict TSS using a relationship obtained from in situ turbidity were not always satisfactory. Depending on the precision required, either higher resolution measurements or in vitro turbidity measurements of the TSS samples might be necessary. Finally, these high resolution measurements enabled us to observe other cyclical events that might have been missed if the measurement intervals were greater than one hour. 相似文献
957.
Franois P. Brissette Robert Leconte Claude Marche Jean Rousselle 《Journal of the American Water Resources Association》2003,39(6):1385-1396
ABSTRACT: There is a general belief in the public eye that extreme events such as floods are becoming more and more common. This paper explores this hypothesis by examining the historical evolution of annual expected flooding damage on the Chateauguay River Basin, located at the border between the United States and the province of Quebec, Canada. A database of basin land use was constructed for the years 1930 and 1995 to assess anthropogenic changes and their impact on the basin's hydrology. The progressive modification of the likelihood of a flooding event over the same period was then investigated using homogeneity and statistical tests on available hydrometric data. The evolution of the annual expected flooding damage was then evaluated using a coupled hydrologic/hydraulic simulator linked to a damage analysis model. The simulator and model were used to estimate flooding damage over a wide range of flooding return periods, for conditions prevailing in 1963 and 1995. Results of the analysis reveal the absence of any increasing or decreasing trend in the historical occurrence of flooding events. However, a general increase in the annual expected flooding damage was observed for all studied river sections. This increase is linked to an historical increase in damages for a given flooding event, and is the result of unbridled construction and development within the flood zone. To assess for future trends, this study also examined the potential impacts linked to the anticipated global warming. Results indicate that a significant increase in seasonal flooding events and annual expected flooding damage is possible over the next century. In fact, what is now considered a 100‐year flooding event for the summer/fall season could become a ten‐year event by the end of this century. This shows that potential future impacts linked to climate change should be considered now by engineers, land planners, and decision makers. This is especially critical if a design return period is part of the decision making process. 相似文献
958.
Sediment phosphorus extractants for phosphorus-31 nuclear magnetic resonance analysis: a quantitative evaluation 总被引:2,自引:0,他引:2
Ahlgren J De Brabandere H Reitzel K Rydin E Gogoll A Waldebäck M 《Journal of environmental quality》2007,36(3):892-898
The influence of pre-extractant, extractant, and post-extractant on total extracted amounts of P and organic P compound groups measured with 31P nuclear magnetic resonance (31P-NMR) in lacustrine sediment was examined. The main extractants investigated were sodium hydroxide (NaOH) and sodium hydroxide ethylenediaminetetraacetic acid (NaOH-EDTA) with bicarbonate buffered dithionite (BD) or EDTA as pre-extractants. Post extractions were conducted using either NaOH or NaOH-EDTA, depending on the main extractant. Results showed that the most efficient combination of extractants for total P yield was NaOH with EDTA as pre-extractant, yielding almost 50% more than the second best procedure. The P compound groups varying the most between the different extraction procedures were polyphosphates and pyrophosphates. NaOH with BD as pre-extractant was the most efficient combination for these compound groups. 相似文献
959.
Assessing the trophic state of Linhos lake: a first step towards ecological rehabilitation 总被引:2,自引:0,他引:2
Lack of recognition of the value of wetlands has led to the loss of considerable areas of these ecosystems in the past. Linhos lake (Figueira da Foz, Portugal) is a good example of one of these ecosystems, in which human intervention was responsible for its environmental degradation and led to its precocious terrestrialization. Physico-chemical conditions and zooplankton community structure were studied in Linhos lake, in order to evaluate ecosystem functioning and to acquire baseline information. The system is characterised by high oxygen depletion. Spatial heterogeneity was confirmed by the existence of significant differences in total densities for the three zooplanktonic groups. Rotifers were the most abundant group attaining their maximum density in April (2251 x 1 ind/l). Keratella quadrata, K. cochlearis, Polyarthra vulgaris, Filinia terminalis and Hexarthra mira were the main abundant species. Correspondence analysis suggested temperature as the main controlling factor in species seasonality. In order to prevent the precocious disappearance of the lake some restoration measures were proposed based on zooplankton community structure. 相似文献
960.
Aluísio Braz De Melo Arlindo F. Gonçalves Isabel M. Martins 《Resources, Conservation and Recycling》2011,55(12):1252-1264
The management of construction and demolition waste (CDW) is essential in the formation, growth and renovation of urban areas. This paper presents part of a study on CDW generation and management in the Lisbon Metropolitan Area (LMA). CDW generation was estimated for 2006 and 2007 based on construction activity and waste load movements. The results revealed that in the municipality of Lisbon, remodeling construction activity prevailed, with CDW generation indicators of 954 t/day and a per capita rate of 0.60 t/year. Both values are above the average for the LMA and its two sub-regions (Greater Lisbon and the Setúbal Peninsula). The installed infrastructure for CDW management identified in the LMA is situated within a maximum distance of about 23 km from the geometric center of the city of Lisbon. Despite the fact these locations favor the municipality of Lisbon, the occurrence of illegal dumps is still a reality. A notable effort towards environmental education addressing CDW management is under way so as to make involved citizens aware of the recent CDW legislation, Decree-Law Nr. 46/2008, as well as of the problems arising from scenarios of environmental degradation and uncontrolled use of natural resources in the civil construction sector. Policies are outlined aiming to move towards the more judicious management of CDW. 相似文献