全文获取类型
收费全文 | 228篇 |
免费 | 9篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 8篇 |
废物处理 | 11篇 |
环保管理 | 42篇 |
综合类 | 25篇 |
基础理论 | 44篇 |
污染及防治 | 73篇 |
评价与监测 | 22篇 |
社会与环境 | 11篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 5篇 |
2022年 | 7篇 |
2021年 | 13篇 |
2020年 | 7篇 |
2019年 | 7篇 |
2018年 | 6篇 |
2017年 | 18篇 |
2016年 | 7篇 |
2015年 | 13篇 |
2014年 | 12篇 |
2013年 | 20篇 |
2012年 | 8篇 |
2011年 | 11篇 |
2010年 | 7篇 |
2009年 | 11篇 |
2008年 | 15篇 |
2007年 | 13篇 |
2006年 | 15篇 |
2005年 | 3篇 |
2004年 | 11篇 |
2003年 | 2篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1995年 | 5篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1991年 | 1篇 |
1988年 | 3篇 |
1987年 | 1篇 |
1983年 | 2篇 |
1958年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有238条查询结果,搜索用时 15 毫秒
201.
202.
203.
Pierre‐Nicolas Carron Philippe Reigner Laurent Vallotton Jean‐Gabriel Clouet Claude Danzeisen Mathias Zürcher Bertrand Yersin 《Disasters》2014,38(2):434-450
In case of a major incident or disaster, the advance medical rescue command needs to manage several essential tasks simultaneously. These include the rapid deployment of ambulance, police, fire and evacuation services, and their coordinated activity, as well as triage and emergency medical care on site. The structure of such a medical rescue command is crucial for the successful outcome of medical evacuation at major incidents. However, little data has been published on the nature and structure of the command itself. This study presents a flexible approach to command structure, with two command heads: one emergency physician and one experienced paramedic. This approach is especially suitable for Switzerland, whose federal system allows for different structures in each canton. This article examines the development of these structures and their efficiency, adaptability and limitations with respect to major incident response in the French‐speaking part of the country. 相似文献
204.
Jesús Miguel Avilés Eva María Bootello Mercedes Molina-Morales Juan Gabriel Martínez 《Behavioral ecology and sociobiology》2014,68(8):1287-1298
Studies of antiparasite defences against cuckoo parasites have largely neglected the possibility that behavioural components of host defence may correlate giving rise to a behavioural syndrome. Furthermore, the different contribution of the host’s sex in nest defence has traditionally been disregarded. Here, we studied magpie (Pica pica) mobbing behaviour towards dummies of great spotted cuckoo (Clamator glandarius) and non-harmful hoopoes (Upupa epops) and egg rejection of parasite eggs in a population of colour-banded magpies. We predicted a positive correlation between the intensity of nest defence and egg rejection within each sex and that females respond more intensely than males to the threat of brood parasitism as they undertake incubation. Magpie males, but not females, defended their nests more intensely in those nests in which cuckoo model eggs were rejected. Individual magpies did significantly differ in their baseline level of nest attentiveness; however, there were no individual differences once pair identity was considered. Males and females defended their nests more intensely when it was exposed to the presence of a great spotted cuckoo dummy. Males, but not females, were more prone to appear at their nests, and females, but not males, were more prone to defend more intensely when their nests were challenged by a parasite threat. Our results thus agree with the view that mobbing behaviour and egg rejection in magpies may actually constitute a pseudosyndrome and highlight the necessity to integrate interindividual variation and the sex of the host in studies of the evolution of host defences. 相似文献
205.
Fabia Barbosa Silva Alan Carlos Costa Clarice Aparecida Megguer Júlien Silva Lima Priscila Ferreira Batista Deborah Amorim Martins Gabriel Martins Almeida Marisa Domingos Caroline Müller 《环境质量管理》2021,30(3):17-25
The economic basis of the Brazilian midwest is agriculture, concentrating most of the grain production in the country. With the purpose of increasing yield, farmers have intensified land use and the use of atrazine among other pesticides, which can supposedly compromise human health and photosynthetic metabolism of plant species from Cerrado, such as Handroanthus heptaphyllus. The aim of this study was to determine experimentally the sensitivity level of H. heptaphyllus to atrazine, by measuring gas exchange, chlorophyll a fluorescence, chloroplastidic pigments, and membrane permeability. The experiment was conducted in a factorial scheme. Nine‐month‐old H. heptaphyllus plants were treated with six realistic doses of atrazine: 0, 25, 50, 100, 200, and 400 g a.i. ha–1 (corresponding to 10, 20, 40, 80, and 100% of the commercial dose recommended for corn crops, respectively), with five replications. Evaluations were performed at 12, 36, 84, 180, and 276 h after treatment application. Photosynthesis, the effective quantum yield of photosystem II, and electron transport rate were gradually reduced by the action of atrazine. On the other hand, the nonphotochemical quenching increased gradually, which indicates that this mechanism was not sufficient to avoid oxidative stress and cellular damage in H. heptaphyllus treated plants. Based on these results, we concluded that the action of the herbicide in the photosynthetic reduction occurs by the electron transport rate limitation. Therefore, H. heptaphyllus trees are at risk in Cerrado areas next to agricultural lands. 相似文献
206.
Gabriel Ramos-Fernández Denis Boyer Filippo Aureli Laura G. Vick 《Behavioral ecology and sociobiology》2009,63(7):999-1013
We use two novel techniques to analyze association patterns in a group of wild spider monkeys (Ateles geoffroyi) studied continuously for 8 years. Permutation tests identified association rates higher or lower than chance expectation,
indicating active processes of companionship and avoidance as opposed to passive aggregation. Network graphs represented individual
adults as nodes and their association rates as weighted edges. Strength and eigenvector centrality (a measure of how strongly
linked an individual is to other strongly linked individuals) were used to quantify the particular role of individuals in
determining the network's structure. Female–female dyads showed higher association rates than any other type of dyad, but
permutation tests revealed that these associations cannot be distinguished from random aggregation. Females formed tightly
linked clusters that were stable over time, with the exception of immigrant females who showed little association with any
adult in the group. Eigenvector centrality was higher for females than for males. Adult males were associated mostly among
them, and although their strength of association with others was lower than that of females, their association rates revealed
a process of active companionship. Female–male bonds were weaker than those between same-sex pairs, with the exception of
those involving young male adults, who by virtue of their strong connections both with female and male adults, appear as temporary
brokers between the female and male clusters of the network. This analytical framework can serve to develop a more complete
explanation of social structure in species with high levels of fission–fusion dynamics.
This contribution is part of the special issue “Social Networks: new perspectives” (Guest Editors: J. Krause, D. Lusseau and
R. James) 相似文献
207.
We present a method for detecting the zones where an irregularly sampled variable changes abruptly in the plane. Such zones
are called Zones of Abrupt Change (ZACs). This method not only allows estimation of ZACs, but also testing of their statistical
significance against the null hypothesis of a stationary correlated random field. The sampling pattern, in particular its
local density, is crucial in the detection of potential ZACs. In this paper, we address the problem of evaluating the sampling
pattern by assessing the power of the local test used for detecting ZACs. It is shown that mapping the power allows us to
identify zones where ZACs may or may not be detected. The methodology is applied to a soil data set sampled at eight different
dates in an agricultural field. Detecting ZACs for the soil water content allowed us to identify permanent structures in the
agricultural field related to the boundaries between different soil types. Mapping the power for various sampling densities
proved to be useful to determine the minimal sampling density necessary for detecting ZACs.
相似文献
Edith GabrielEmail: |
208.
Estrabou C Filippini E Soria JP Schelotto G Rodriguez JM 《Environmental monitoring and assessment》2011,182(1-4):375-383
Air quality studies with bioindicators have not been well developed in South America. In the city of Córdoba, there are not permanent air pollutant measurements by equipment. In order to develop an air quality biomonitoring system using lichens, we applied a systematic sampling in the city of Córdoba, Argentina. A total of 341 plots were sampled in the area of the city which is a square of 24 × 24 km. In each sample plot we selected three phorophytes and estimated the frequency and cover of lichen species growing at 1.5 m on trunks. We also calculated the Index of Atmospheric Purity (IAP) using lichen frequencies. Maps with number of lichen species, cover values, and IAP were performed. The lichen community was described with nine species where Physcia undulata and Physcia endochryscea were the most frequent. Moreover, these two species were dominant in the community with the highest cover index. The central area of the city is considered a lichen desert with poor air quality. The southeast and northwest areas of the city showed the highest IAP values and number of species. In general, the city shows fair air quality and few areas with good and very good air quality. 相似文献
209.
Lourino-Cabana B Billon G Magnier A Prygiel E Baeyens W Prygiel J Mikkelsen O Ouddane B 《Journal of environmental monitoring : JEM》2011,13(8):2124-2133
The monitoring of dissolved zinc in the De?le river was undertaken at three different periods of the years 2008 and 2009. Electrolabile concentrations of Zn were estimated every 2 hours for several weeks by using an ATMS (Automatic Trace metal Monitoring System) based on voltammetric measurements using a solid Ag-Hg rotating disc working electrode. Complementary measurements were carried out with DGT (Diffusive Gradient in Thin films) pistons deployed directly in the river for 24 hours. Water samples filtrated at 0.45 μm were also analysed by HR-ICP-MS to estimate the total dissolved concentrations of zinc and other trace metals. High frequency monitoring of zinc over several weeks in the De?le river indicated that the concentration could change significantly over short time periods. Resuspension of polluted sediment and biological activities are two main factors that control the behaviour of zinc in the De?le river. Furthermore, in May 2009, daily cycles of the electrolabile zinc fraction have been observed at relatively constant total dissolved concentration. It is assumed that this particular behaviour of zinc is based on an exchange between colloids and/or nonelectrolabile forms and free cation and inorganic complexes at a daily time scale. 相似文献
210.
Paíga Paula Sousa Sara Vera José Bitencourt Luciana Vieira Joana Jorge Sandra Silva Jaime Gabriel Correia Manuela Domingues Valentina F. Delerue-Matos Cristina 《Environmental science and pollution research international》2021,28(47):66787-66803
Environmental Science and Pollution Research - Three sampling campaigns were performed in the Lis River (Leiria, Portugal) in February of 2018, November of 2018, and May of 2019. River water and... 相似文献