全文获取类型
收费全文 | 2226篇 |
免费 | 23篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 63篇 |
废物处理 | 163篇 |
环保管理 | 172篇 |
综合类 | 211篇 |
基础理论 | 456篇 |
环境理论 | 3篇 |
污染及防治 | 830篇 |
评价与监测 | 214篇 |
社会与环境 | 143篇 |
灾害及防治 | 9篇 |
出版年
2023年 | 20篇 |
2022年 | 82篇 |
2021年 | 67篇 |
2020年 | 40篇 |
2019年 | 50篇 |
2018年 | 75篇 |
2017年 | 84篇 |
2016年 | 113篇 |
2015年 | 74篇 |
2014年 | 128篇 |
2013年 | 211篇 |
2012年 | 155篇 |
2011年 | 190篇 |
2010年 | 123篇 |
2009年 | 102篇 |
2008年 | 113篇 |
2007年 | 141篇 |
2006年 | 102篇 |
2005年 | 74篇 |
2004年 | 65篇 |
2003年 | 52篇 |
2002年 | 60篇 |
2001年 | 30篇 |
2000年 | 24篇 |
1999年 | 20篇 |
1998年 | 12篇 |
1997年 | 6篇 |
1996年 | 9篇 |
1995年 | 11篇 |
1994年 | 6篇 |
1993年 | 3篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1983年 | 1篇 |
1979年 | 1篇 |
1967年 | 2篇 |
1964年 | 1篇 |
1958年 | 1篇 |
1956年 | 1篇 |
1915年 | 1篇 |
排序方式: 共有2264条查询结果,搜索用时 31 毫秒
991.
992.
993.
Dominguez Joaquin R. García Juan Alvarez Sílvia 《Environmental science and pollution research international》2021,28(15):18725-18726
Environmental Science and Pollution Research - 相似文献
994.
995.
996.
The present study represents the first comprehensive work dealing with the dietary analysis of Caprellidea. We studied 743
specimens of 31 genera and 62 species from all around the world. Analysis of digestive contents revealed that caprellids are
mainly detritivores (detritus represented the 86% of the caprellid diet), but a small percentage of species, those lacking
molars belonging to the Phtisicinae, can be considered as obligate predators and feed mainly on small crustaceans (copepods
and other amphipods) and polychaetes. The contribution of sponges, hydroids, macroalgae, diatoms and dinoflagellates to the
caprellid diet was very low (<2%). Apart from the clear relationship between the absence of molar process and predators, no
other correlations between digestive contents and mouthpart structure were found. Cluster analysis based on the dietary data
indicated a patent segregation between the Phtisicinae (obligate predators) and Caprellinae (detritivores, detritivores/predators
or opportunistics) and could support the hypothesis of basal divergence in two major lines of evolution: Phtisicinae and Caprogammaridae–Caprellinae.
Consequently, the debate questioning if the taxon Caprellidea is a monophyletic group or not is still open. Additional morphological,
molecular and behavioral studies are necessary to define the evolutionary relationships in this group of crustaceans. 相似文献
997.
J. A. Camiñas N. Cano D. Cortés V. Díaz del Río A. García J. P. Rubín 《Journal of Coastal Conservation》1998,4(1):43-50
In October 1992, the Oceanographic Centre of Málaga of the Spanish Oceanographical Institute (IEO) started a monitoring project,Ecomálaga, which collects physical, chemical, biological and sedimentological data from the Alborán Sea shelf. The project is coordinated
with similar projects in the Atlantic and Mediterranean Centres of IEO. The ultimate objective is to, understand the long-term
changes of the essential marine-environmental parameters.
So far, nine quarterly surveys have been carried out—from October 1992 to December 1994. The following variables were registered:abiotic: location weather, water temperature, salinity, pH, dissolved oxygen, chlorophyll a, nitrate, nitrite, phosphate, silicate,biotic: zooplankton biomass and species composition, and ichthyoplankton. The granulometric composition and organic matter content
of sediments are also included.
Data are stored in a computerized data base named Ecomálaga Data Base, with contributions from geology, physics, plankton
biology and marine chemistry. The data base not only contains separate files for each research topic, but also allows for
interchange between these files, resulting in a synoptic data output. It offers the users an output in the form of synthetic
records of each station sampled.
The analysis of the data indicates seasonal influences and ainshore-offshore gradient, as well as an Atlantic influence on
the stations located in the transect closest to the Strait of Gibraltar. 相似文献
998.
Isabel Gallego-Álvarez Luis Rodríguez-Domínguez Isabel-María García-Sánchez 《Journal of Cleaner Production》2011,19(9-10):912-926
The purpose of this research is to analyze different factors behind the disclosure of corporate information on issues related to opportunities arising from climate change worldwide.To achieve that purpose we formulated a dependency model in which the dependent variable corresponds to the creation of a disclosure index on greenhouse gas emissions based on the opportunities arising from climate change and disclosed by companies on their websites. The sample used comprises companies from different countries and activity sectors considered as the most sensitive to greenhouse gas emissions.The results obtained point out that companies with higher environmental performance disclose a larger volume of information on opportunities arising from climate change on their websites, compared to companies with lower environmental performance. Likewise, companies from countries that have ratified the Kyoto Protocol disclose a higher volume of information on greenhouse gas emissions on their websites, compared to companies from countries which have not ratified it. 相似文献
999.
1000.
Lolita Vilavert Martí Nadal Isabel Inza María J. Figueras José L. Domingo 《Waste management (New York, N.Y.)》2009,29(9):2454-2461
New waste management programs are currently aimed at developing alternative treatment technologies such as mechanical–biological treatment (MBT) and composting plants. However, there is still a high uncertainty concerning the chemical and microbiological risks for human health, not only for workers of these facilities, but also for the population living in the neighborhood. A new MBT plant is planned to be constructed adjacently to a municipal solid waste incinerator (MSWI) in Tarragona (Catalonia, Spain). In order to evaluate its potential impact and to differentiate the impacts of MSWI from those of the MBT when the latter is operative, a pre-operational survey was initiated by determining the concentrations of 20 volatile organic compounds (VOCs) and bioaerosols (total bacteria, Gram-negative bacteria, fungi and Aspergillus fumigatus) in airborne samples around the MSWI. The results indicated that the current concentrations of bioaerosols (ranges: 382–3882, 18–790, 44–926, and <1–7 CFU/m3 for fungi at 25 °C, fungi at 37 °C, total bacteria, and Gram-negative bacteria, respectively) and VOCs (ranging from 0.9 to 121.2 μg/m3) are very low in comparison to reported levels in indoor and outdoor air in composting and MBT plants, as well in urban and industrial zones. With the exception of total bacteria, no correlations were observed between the environmental concentrations of biological agents and the direction/distance from the facility. However, total bacteria presented significantly higher levels downwind. Moreover, a non-significant increase of VOCs was detected in sites closer to the incinerator, which means that the MSWI could have a very minor impact on the surrounding environment. 相似文献