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Ana Paula Madeira Di Beneditto Cristina Maria Magalhães de Souza Helena Amaral Kehrig Carlos Eduardo Rezende 《Marine Biology》2011,158(10):2209-2217
The feeding preferences of the coastal dolphins Pontoporia blainvillei and Sotalia guianensis in south-eastern Brazil (21o18′S–22o25′S) were assessed through the prey’s index of relative importance (IRI), total mercury
concentration (Hgtot), and stable isotopic (δ15N and δ13C) to compare their efficiency in the discrimination of prey contribution to the predators’ diet. The IRI was the best tool
to describe the dolphins’ preference, while Hgtot and δ15N seemed to be efficient as a trophic marker when the diet is made up of prey of varying sizes, as observed in S. guianensis. Both dolphins presented lighter δ15N than their prey species, which is an unusual pattern. However, as the sample size to isotope ratios analysis was small,
especially to the dolphins, the results should be considered with caution, and further studies are necessary to corroborate
these findings. The δ13C values characterized a typical coastal food chain, confirming the preferential area of these species. 相似文献
225.
Eduardo V. V. Varej?o Carlos R. Bellato Maur��cio P. F. Fontes Jaime W. V. Mello 《Environmental monitoring and assessment》2011,172(1-4):631-642
The Iron Quadrangle has been one of the most important gold production regions in Brazil since the end of the seventeenth century. There, arsenic occurs in close association with sulfide-rich auriferous rocks. The most abundant sulfide minerals are pyrite and arsenopyrite, yet trace metal sulfides occur in subordinate phases as well. Historical mining activities have been responsible for the release of As and trace metals to both aquatic and terrestrial environments close to mining sites in the region. Therefore, this study was aimed to evaluate the distribution and mobility of As, Cd, Co, Cr, Cu, Ni, Pb, and Zn in streams in the southeast portion of the Iron Quadrangle between the municipalities of Ouro Preto and Mariana, the oldest Brazilian Au mining province. Total concentrations of some trace metals and arsenic in water were determined. The four-stage sequential extraction procedure proposed by the commission of the European Communities Bureau of Reference (BCR) was used to investigate the distribution of these elements in stream sediments. Arsenic concentration in water was >10 ??g L???1 (maximum limit permitted by Brazilian environmental regulations for water destined for human consumption) at all sampling sites, varying between 36.7 and 68.3 ??g L???1. Sequential extraction in sediments showed high concentrations of As and trace metals associated with easily mobilized fractions. 相似文献
226.
Martins Thiago Rodrigues Bertuol Daniel Assumpo Tanabe Eduardo Hiromitsu 《Journal of Material Cycles and Waste Management》2022,24(2):633-641
Journal of Material Cycles and Waste Management - Technological development has led to a growing generation of waste electrical and electronic equipment, including cables. This work concerns the... 相似文献
227.
Schneider Silvana Demarqui Fábio de Freitas Costa Eduardo 《Environmental and Ecological Statistics》2022,29(4):869-911
Environmental and Ecological Statistics - Populations of free-ranging dogs are still a matter of concern in developing countries. The presence of stray dogs is associated with environmental and... 相似文献
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Curbani Franciane Entringer Lacerda Kaio Calmon Curbani Flávio Barreto Fernando Túlio Camilo Tadokoro Carlos Eduardo Chacaltana Julio Tomás Aquije 《Environmental Modeling and Assessment》2022,27(2):233-249
Environmental Modeling & Assessment - Subtropical estuaries such as the Vitória Island Estuarine System (VIES), located on the central coast of Brazil, are under strong anthropic pressure.... 相似文献
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Zamora-Briseño Jesús Alejandro Améndola-Pimenta Monica Ortega-Rosas Daniel Antonio Pereira-Santana Alejandro Hernández-Velázquez Ioreni Margarita González-Penagos Carlos Eduardo Pérez-Vega Juan Antonio del Río-García Marcela Árcega-Cabrera Flor Rodríguez-Canul Rossanna 《Environmental science and pollution research international》2021,28(26):34309-34327
Environmental Science and Pollution Research - Crude oil is one of the most widespread pollutants released into the marine environment, and native species have provided useful information about the... 相似文献
230.
This research addresses the need to improve our knowledge on the demand for national forests for recreation and offers an in-depth data analysis supported by the complementary use of count data and ordered models. From a policy-making perspective, while count data models enable the estimation of monetary welfare measures, ordered models allow for the wider use of the database and provide a more flexible analysis of data. The main purpose of this article is to analyse the individual forest recreation demand and to derive a measure of its current use value. To allow a more complete analysis of the forest recreation demand structure the econometric approach supplements the use of count data models with ordered category models using data obtained by means of an on-site survey in the Bussaco National Forest (Portugal). Overall, both models reveal that travel cost and substitute prices are important explanatory variables, visits are a normal good and demographic variables seem to have no influence on demand. In particular, estimated price and income elasticities of demand are quite low. Accordingly, it is possible to argue that travel cost (price) in isolation may be expected to have a low impact on visitation levels. 相似文献