全文获取类型
收费全文 | 105篇 |
免费 | 3篇 |
专业分类
安全科学 | 11篇 |
废物处理 | 6篇 |
环保管理 | 11篇 |
综合类 | 20篇 |
基础理论 | 29篇 |
污染及防治 | 23篇 |
评价与监测 | 5篇 |
社会与环境 | 3篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2017年 | 5篇 |
2016年 | 5篇 |
2015年 | 2篇 |
2014年 | 7篇 |
2013年 | 8篇 |
2012年 | 4篇 |
2011年 | 8篇 |
2010年 | 8篇 |
2009年 | 7篇 |
2008年 | 8篇 |
2007年 | 7篇 |
2006年 | 8篇 |
2005年 | 4篇 |
2004年 | 4篇 |
2002年 | 2篇 |
2001年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1993年 | 1篇 |
1989年 | 2篇 |
排序方式: 共有108条查询结果,搜索用时 15 毫秒
31.
Mathieu Goriaux Maryline Pflieger Anne Monod Sasho Gligorovski Rafal S. Strekowski Henri Wortham 《Environmental science and pollution research international》2014,21(8):5628-5636
The heterogeneous ozonolysis of naphthalene adsorbed on XAD-4 resin was studied using an annular denuder technique. The experiments involved depositing a known quantity of naphthalene on the XAD-4 resin and then measuring the quantity of the solid naphthalene that reacted away under a constant flow of gaseous ozone (0.064 to 4.9 ppm) for a defined amount of time. All experiments were performed at room temperature (26 to 30 °C) and atmospheric pressure. The kinetic rate coefficient for the ozonolysis reaction of naphthalene adsorbed on XAD-4 resin is reported to be (10.1?±?0.4)?×?10?19 cm3 molecule?1 s?1 (error is 2σ, precision only). This value is five times greater than the currently recommended literature value for the homogeneous gas phase reaction of naphthalene with ozone. The obtained rate coefficient is used to evaluate reaction artifacts from field concentration measurements of naphthalene, acenaphthene, and phenanthrene. The observed uncertainties associated with field concentration measurements of naphthalene, acenaphthene, and phenanthrene are reported to be much higher than the uncertainties associated with the artifact reactions. Consequently, ozone reaction artifact appears to be negligible compared to the observed field measurement uncertainty results. 相似文献
32.
While factors affecting body growth have been extensively studied, very little is known about the factors likely to affect the sexual size dimorphism (SSD) in polygynous mammals. Based on the carcass mass of 24420 male and female moose recorded in 14 Norwegian populations, we examine three hypotheses to explain geographical variation in SSD. First, SSD is expected to decrease when the relative density of animals (for a given habitat quality) increases, because resource limitation at high population densities is assumed to affect body growth of males more than females. Second, because males are selected to invest in growth more than females, environmental seasonality and related improvement of the forage quality during the short and intense growing season are expected to increase SSD. Third, by decreasing the proportion of adult males in the population, resulting in start of rutting earlier in life, hunting may decrease the SSD by increasing the reproductive cost of young males. We found that males grew faster and for a longer time of their life than did females and thus were heavier (-24%) when they reached adulthood. Sexual size dimorphism was independent of density but was higher in areas with short growing seasons. The low SSD in populations with largely adult female-biased sex ratios (males per female) shows that male body growth decreases with a decreasing proportion of adult males in the population. Our results indicate that geographical variation in moose SSD is influenced by divergent responses in the sexes to ecological factors affecting body growth. 相似文献
33.
John E. Mathieu Tonia S. Heffner Gerald F. Goodwin Janis A. Cannon‐Bowers Eduardo Salas 《组织行为杂志》2005,26(1):37-56
We tested the impact of teammates' team and task mental model sharedness on team processes and performance using 70 undergraduate teams that completed a series of missions on a PC‐based flight simulator. Moreover, we considered how the quality of mental models might moderate such relationships. Team processes were found to partially mediate the relationship between task mental model sharedness and team performance. Although team mental model sharedness failed to exhibit a significant linear relationship with team processes or performance, it did evidence a multiplicative relationship as moderated by the quality of those models. Team processes and performance were better among teams sharing higher‐quality team mental models than among teams evidencing less sharedness or who had lower‐quality models. Again, team processes partially mediated these relationships. Results are discussed in terms of the equifinality of mental model quality and applications to various team environments. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
34.
Brigitte Simon-Bouy Agnès Taillandier Delphine Fauvert Isabelle Brun-Heath Jean-Louis Serre Carmen G. Armengod Martin G. Bialer Michèle Mathieu Jacques Cousin David Chitayat Jan Liebelt Barbara Feldman Marion Gérard-Blanluet Stefani Körtge-Jung Cath King Hannele Laivuori Martine Le Merrer Sarju Mehta Christina Jern Saba Sharif Fabienne Prieur Gabriele Gillessen-Kaesbach Andreas Zankl Etienne Mornet 《黑龙江环境通报》2008,28(11):993-998
35.
A method has been developed to isolate glycogen cells (=vesicular connective tissue cells) from the labial palps of the marine mussel Mytilus edulis L. These cells have a modal density of 1.14 g ml-1 and this property has been exploited to separate them from pronase-dissociated cell dispersions by density-gradient centrifugation. The isolated cells were mainly spherical, with a small peripheral nucleus. The quasitotality of the cell was filled with -like glycogen particles with cellular organelles being limited to the cell periphery. The major recipients of [U-14C] glucose-derived carbon were glycogen and amino acids. Only small quantities of 14C radiolabel were recovered from lipids, protein and CO2. Glucose incorporation into glycogen increased linearly over 6 h and showed saturation kinetics with respect to exogenous glucose concentration. 相似文献
36.
Christina Madonia Pierce Hutton Mathieu Giraudeau Tuul Sepp 《Die Naturwissenschaften》2017,104(11-12):96
Some of the most spectacular visual signals found in the animal kingdom are based on dietarily derived carotenoid pigments (which cannot be produced de novo), with a general assumption that carotenoids are limited resources for wild organisms, causing trade-offs in allocation of carotenoids to different physiological functions and ornamentation. This resource trade-off view has been recently questioned, since the efficiency of carotenoid processing may relax the trade-off between allocation toward condition or ornamentation. This hypothesis has so far received little exploratory support, since studies of digestive efficiency of wild animals are limited due to methodological difficulties. Recently, a method for quantifying the percentage of fat in fecal samples to measure digestive efficiency has been developed in birds. Here, we use this method to test if the intensity of the carotenoid-based coloration predicts digestive efficiency in a wild bird, the house finch (Haemorhous mexicanus). The redness of carotenoid feather coloration (hue) positively predicted digestion efficiency, with redder birds being more efficient at absorbing fats from seeds. We show for the first time in a wild species that digestive efficiency predicts ornamental coloration. Though not conclusive due to the correlative nature of our study, these results strongly suggest that fat extraction might be a crucial but overlooked process behind many ornamental traits. 相似文献
37.
Mathieu B. Hounsou Bernard Ahamide Euloge K. Agbossou Thomas Gaiser 《The Environmentalist》2011,31(4):407-415
Water is an essential element for humankind, animals, and plants. It is also an important element of the aquatic environment
(the natural habitat of multiple species), where its quality plays a determining role in their protection and conservation.
Unfortunately, the water quality of natural environments has worsened in the last decades. In sub-Saharan Africa and particularly
in Bénin, in contrast to river discharges, monitoring the quality of surface water is a very rare activity. Thus, knowledge
about physical and chemical properties as a basis for evaluation of the state of the environment and protection measures needed
is almost absent. This article presents the results of the first structured, regular monitoring campaign on surface waters
in the whole basin of the Ouémé River in Bénin Republic. With 510 km, the Ouémé River’s water quality fluctuates from upstream
(Taneka Koko mountains in the north) to downstream (gauging station Bonou in the south) sources. This is due to soil erosion,
lack of water treatment plants, and the use of significant quantities of fertilizer in the cotton zone. The present research
was initiated to study the resource degradation of this area through chemical and physical water analysis. The monitoring
of water quality has been followed for 5 years on twenty physicochemical parameters, from samples taken at four gauging stations
on the main channel of the Ouémé River. Means and standard deviations of water analysis results were compared to both the
recommendations of the World Health Organization (WHO) and the Maximum Permissible Concentrations (MPC) for drinking water
(WHO 1987). Thus, high values were observed for physical parameters, i.e., color and turbidity had peaks of 697.5 uC and 129 FTU at
Bétérou station in the wet season, although certain parameters, such as total hardness, present low values compared to the
recommended standards. Moreover, excluding the concentrations of NO2
− and NH4
+ with values above the MPC, nutrient concentrations posed no direct risk for human consumption. However, together with phosphate
concentrations (which are up to ten times higher than permissible ecological thresholds), they can cause eutrophication of
the aquatic ecosystem. Due to the current flow regime, which has very low discharge rates in the dry season and torrential
rainfall and high sediment loads in the wet season, the risk of eutrophication, i.e., excessive concentrations of ammonium
and phosphates, is present throughout the year. Accumulation of ammonium and the distribution of nitrate and nitrites in the
river water suggest that nitrification is impeded due to a lack of oxygen in both dry and wet seasons. Finally, the investigations
show that the risk of water pollution exists and it is necessary to take measures of sanitation and water treatment to prevent
the further degradation of water along the Ouémé River. 相似文献
38.
Barret M Carrère H Patau M Patureau D 《Journal of environmental monitoring : JEM》2011,13(10):2770-2774
The fate of micropollutants throughout wastewater treatment systems is highly dependent on their sorption interactions with sludge matter. In this study, both the sorption and desorption kinetics of polycyclic aromatic hydrocarbons (PAHs) in activated sludge were shown to be very rapid in comparison to biodegradation kinetics. It was concluded that PAH transfer does not limit their biodegradation and that their fate is governed by the sorption/desorption equilibrium state. The effect of contact time between sludge and PAHs was also investigated. It was shown that aging did not influence the sorption/desorption equilibrium although PAH losses during aging suggest that sequestration phenomena had occurred. This implies that for PAH sorption assessment within treatment processes there is no need to include a contact time dimension. As a consequence, thanks to an innovative approach taking into account sorption equilibria and sequestration, this work has demonstrated that studies in the literature which, in main, deal with micropollutant sorption in sewage sludge with only a short contact time can be extrapolated to real systems in which sorption, desorption and aging occur. 相似文献
39.
Nagy JA Johnson DL Larter NC Campbell MW Derocher AE Kelly A Dumond M Allaire D Croft B 《Ecological applications》2011,21(6):2334-2348
Effective management and conservation of species, subspecies, or ecotypes require an understanding of how populations are structured in space. We used satellite-tracking locations and hierarchical and fuzzy clustering to quantify subpopulations within the behaviorally different barren-ground caribou (Rangifer tarandus groenlandicus), Dolphin and Union island caribou (R. t. groenlandicus x pearyi), and boreal (R. t. caribou) caribou ecotypes in the Northwest Territories and Nunavut, Canada. Using a novel approach, we verified that the previously recognized Cape Bathurst, Bluenose-West, Bluenose-East, Bathurst, Beverly, Qamanirjuaq, and Lorillard barren-ground subpopulations were robust and that the Queen Maude Gulf and Wager Bay barren-ground subpopulations were organized as individuals. Dolphin and Union island and boreal caribou formed one and two distinct subpopulation, respectively, and were organized as individuals. Robust subpopulations were structured by strong annual spatial affiliation among females; subpopulations organized as individuals were structured by migratory connectivity, barriers to movement, and/or habitat discontinuity. One barren-ground subpopulation used two calving grounds, and one calving ground was used by two barren-ground subpopulations, indicating that these caribou cannot be reliably assigned to subpopulations solely by calving-ground use. They should be classified by annual spatial affiliation among females. Annual-range size and path lengths varied significantly among ecotypes, including mountain woodland caribou (R. t. caribou), and reflected behavioral differences. An east-west cline in annual-range sizes and path lengths among migratory barren-ground subpopulations likely reflected differences in subpopulation size and habitat conditions and further supported the subpopulation structure identified. 相似文献
40.
In ants, winged queens that are specialized for independent colony foundation can be replaced by wingless reproductives better
adapted for colony fission. We studied this shift in reproductive strategy by comparing two Mystrium species from Madagascar using morphometry, allometry and dissections. Mystrium rogeri has a single dealate queen in each colony with a larger thorax than workers and similar mandibles that allow these queens
to hunt during non-claustral foundation. In contrast, Mystrium ‘red’ lacks winged queens and half of the female adults belong to a wingless ‘intermorph’ caste smaller and allometrically distinct
from the workers. Intermorphs have functional ovaries and spermatheca while those of workers are degenerate. Intermorphs care
for brood and a few mate and reproduce making them an all-purpose caste that takes charge of both work and reproduction. However,
their mandibles are reduced and inappropriate for hunting centipedes, unlike the workers’ mandibles. This together with their
small thorax disallow them to perform independent colony foundation, and colonies reproduce by fission. M. rogeri workers have mandibles polymorphic in size and shape, which allow for all tasks from brood care to hunting. In M. ‘red’, colonial investment in reproduction has shifted from producing expensive winged queens to more numerous helpers. M. ‘red’ intermorphs are the first case of reproductives smaller than workers in ants and illustrate their potential to diversify
their caste system for better colonial economy. 相似文献