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排序方式: 共有235条查询结果,搜索用时 31 毫秒
141.
Massimo Scalia Sergio Barile Marialuisa Saviano Francesca Farioli 《Sustainability Science》2018,13(5):1235-1244
In the last decades much attention has been dedicated to the interpretation of relevant phenomena in the socio-economic field, highlighting the need of general frameworks of reference for the governance of sustainability and often recurring to the Elkington’s triple bottom line and the Etzkowitz’s triple-helix representations as reference models. In front of a massive scientific production that points out criteria and method of the model, the theory could seem less rich of applications and examples, especially in the field of the inquiry defined by sustainability. In this work, our aim is to provide a little contribution to cover this gap by (1) drawing a more general view from the triple bottom line; (2) highlighting a ‘triple-helix’ functioning in the triple bottom line as represented in the triple helix of sustainability; (3) providing an example, very actual and important, and some general reasoning related to the use of the model as a possible reference in the basic understanding of the complexity of governance for sustainability. 相似文献
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143.
Parvulastra exigua, a species that lacks a dispersive larva, is paradoxically one of the most widely distributed and abundant sea stars in Australia.
The potential that self-fertilization and successful development of self-generated progeny might contribute to population
maintenance in this species was investigated through induction of spawning in isolated individuals collected from five populations
near Sydney, New South Wales (34°S, 151°E), during the spawning period (August–October 2010, 2011). Evidence of selfing differed
significantly among the five populations but the level of selfing within individual egg masses did not. Overall, there was
a mean of 8.9% fertilization in egg masses with embryos. Some clutches developed to the juvenile stage while others arrested
development before hatching. The presence of miniscule testis tissue in gonads that appeared to be ovaries indicated that
hermaphroditism may be more common in some populations than indicated by anatomy. Mixed mating (selfing + outcrossing), pseudocopulation
during egg laying and developmental success of self-fertilized embryos may contribute to the ecological success of P. exigua. These might influence population genetic structure and would facilitate establishment of founder populations by a small
number of migrants. 相似文献
144.
Licea S Zamudio ME Moreno-Ruiz JL Luna R 《Journal of environmental biology / Academy of Environmental Biology, India》2011,32(4):443-453
A diatom data-base of 255 species obtained from 14 oceanographic cruises (14801 entries of 647 sampling sites) together with the analysis of oceanic features were used to establish four local regions in the southern Gulf of Mexico. In addition, common species for each region were designated. This study is based on the application of cluster analysis and the species frequency data. Material for this undertaking consisted of water and net samples obtained between June 1979 and December 2002. Results show that the most frequent species (> 40%) were: Asterionellopsis glacialis, Bacteriastrum delicatulum, B. hyalinum, Chaetoceros affinis, C. coarctatus, C. compresus, C. curvisetus, C. danicus, C. decipiens, C. diversus, C. lorenzianus, C. pelagicus, C. peruvianus, Coscinodiscus radiatus, Cylindrotheca closterium, Guinardia flaccida, Hemiaulus hauckii, H. membranaceus, H. sinensis, Leptocylindrus danicus, Neocalyptrella robusta, Nitzschia bicapitata, Pleurosigma diverse-striatum, Proboscia alata, Pseudo-nitzschia pungens, Pseudosolenia calcar-avis, Rhizosolenia imbricata, R. setigera, Skeletonema costatum, Thalassionema bacillare, T frauenfeldii, T nitzschioides and Thalassiosira eccentrica. The species composition for each region and season are discussed. Itis concluded that sampling site assemblages are related to oceanographic conditions. A total list of species composition is given, forty-seven species taxa being new records for this area. 相似文献
145.
Laura Braida Sergio Crovella Michele Boniotto Ariella Luchesi Umberto de Vonderweid Bruno Casetta Antonio Amoroso 《黑龙江环境通报》2001,21(7):543-546
We describe a quantitative, rapid, sensitive and reproducible tandem mass spectrometry (MSMS) method for the one-step detection of aminoacid (AAs) and acylcarnitine (ACs) concentrations in amniotic fluid. This technology is quicker and more sensitive than other methods used to date since it is possible to determine very low AA and AC concentrations in samples simultaneously in a single run. The high degree of automation allows a large number of pregnancies to be screened for metabolic defects in a very short time. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
146.
Sabrina Portofino Antonio Donatelli Pierpaolo Iovane Carolina Innella Rocco Civita Maria Martino Domenico Antonio Matera Antonio Russo Giacinto Cornacchia Sergio Galvagno 《Waste management (New York, N.Y.)》2013,33(3):672-678
An experimental survey of waste tyre gasification with steam as oxidizing agent has been conducted in a continuous bench scale reactor, with the aim of studying the influence of the process temperature on the yield and the composition of the products; the tests have been performed at three different temperatures, in the range of 850–1000 °C, holding all the other operational parameters (pressure, carrier gas flow, solid residence time). The experimental results show that the process seems promising in view of obtaining a good quality syngas, indicating that a higher temperature results in a higher syngas production (86 wt%) and a lower char yield, due to an enhancement of the solid–gas phase reactions with the temperature. Higher temperatures clearly result in higher hydrogen concentrations: the hydrogen content rapidly increases, attaining values higher than 65% v/v, while methane and ethylene gradually decrease over the range of the temperatures; carbon monoxide and dioxide instead, after an initial increase, show a nearly constant concentration at 1000 °C. Furthermore, in regards to the elemental composition of the synthesis gas, as the temperature increases, the carbon content continuously decreases, while the oxygen content increases; the hydrogen, being the main component of the gas fraction and having a small atomic weight, is responsible for the progressive reduction of the gas density at higher temperature. 相似文献
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149.
Sergio A. Sañudo-Wilhelmy 《Conservation biology》2007,21(4):1130-1130
150.
The rates and patterns of feeding and displacement of predators constitute two of the most important plastic behavioral responses
that allow individuals to respond quickly to changes in abundance of their prey, predation risks and to rapid alterations
in environmental conditions. In this study, we quantified seasonal and spatial variation in displacement (net changes in location
in 12 or 24 h periods) and prey consumed of marked individuals of the keystone seastar Heliaster helianthus at six sites spanning 600 km along the coast of north-central Chile. We evaluated the hypotheses that: (1) at sites with
low availability (cover) of the main prey, the mussel Perumytilus purpuratus, Heliaster displays larger displacements and consumes a greater proportion of other prey (e.g. mobile species) than at sites with high
mussel cover, (2) daily displacements will be correlated with sea surface temperature (SST) and (3) increased wave action
will reduce seastar daily displacement. Our results show that Heliaster displacement is higher at sites with lower availability of P. purpuratus; and at these sites, a larger proportion of Heliaster individuals are observed feeding, mostly on other prey (e.g. limpets), which could offset the higher costs associated with
increased movement. In addition, wave forces affected the activity of Heliaster negatively. Contrary to our expectations, the daily displacements did not show any relationship with SST measured on the
day or the previous days of the surveys, despite the fact that average displacement was generally higher in summer than in
winter months. Future studies should examine Heliaster movement during single foraging excursions and determine whether these responses affect the growth and reproductive output
of individuals. Such information is vital to understand how changes in prey abundance and environmental conditions alter the
behavior and energy budget of this predator and its ability to control prey populations. 相似文献