全文获取类型
收费全文 | 1297篇 |
免费 | 32篇 |
国内免费 | 18篇 |
专业分类
安全科学 | 54篇 |
废物处理 | 68篇 |
环保管理 | 128篇 |
综合类 | 279篇 |
基础理论 | 228篇 |
环境理论 | 1篇 |
污染及防治 | 346篇 |
评价与监测 | 144篇 |
社会与环境 | 79篇 |
灾害及防治 | 20篇 |
出版年
2023年 | 10篇 |
2022年 | 16篇 |
2021年 | 30篇 |
2020年 | 17篇 |
2019年 | 17篇 |
2018年 | 38篇 |
2017年 | 49篇 |
2016年 | 43篇 |
2015年 | 31篇 |
2014年 | 59篇 |
2013年 | 93篇 |
2012年 | 44篇 |
2011年 | 80篇 |
2010年 | 54篇 |
2009年 | 64篇 |
2008年 | 73篇 |
2007年 | 69篇 |
2006年 | 51篇 |
2005年 | 53篇 |
2004年 | 60篇 |
2003年 | 69篇 |
2002年 | 49篇 |
2001年 | 53篇 |
2000年 | 30篇 |
1999年 | 25篇 |
1998年 | 16篇 |
1997年 | 12篇 |
1996年 | 5篇 |
1995年 | 12篇 |
1994年 | 10篇 |
1993年 | 14篇 |
1992年 | 16篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1989年 | 6篇 |
1988年 | 6篇 |
1987年 | 2篇 |
1986年 | 5篇 |
1985年 | 8篇 |
1984年 | 4篇 |
1983年 | 8篇 |
1982年 | 8篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1976年 | 2篇 |
1970年 | 2篇 |
1962年 | 5篇 |
1961年 | 2篇 |
1938年 | 1篇 |
排序方式: 共有1347条查询结果,搜索用时 31 毫秒
611.
De Vela Roger Jay Wigley Kathryn Baronian Kim Gostomski Peter Alan 《Environmental science and pollution research international》2021,28(31):41881-41895
Environmental Science and Pollution Research - The biomass control potential of three metabolic uncouplers (carbonyl cyanide-p-trifluoromethoxyphenylhydrazone (FCCP), carbonyl cyanide... 相似文献
612.
Francesca De Serio Michele Mossa 《Environmental science and pollution research international》2016,23(13):12662-12674
Hydrodynamic and water quality data has been recorded since February 2014 by a meteo-oceanographic station installed in the inner part of the Gulf of Taranto, in the northeastern part of the Ionian Sea (Southern Italy). This monitoring action, managed by the research unit of the Technical University of Bari, DICATECh Department, could play a pivotal role in a vulnerable and sensitive area, affected by massive chemical and biological pollutant discharges due to the presence of heavy industry and intense maritime traffic. Monthly trends of winds, waves, currents, and biochemical parameters, such as dissolved oxygen, chlorophyll, and turbidity, are analyzed and discussed. The analysis exhibits that the wave regime is slightly controlled by wind forcing; rather, topography strongly affects the wave propagation direction. Surface currents appear wind induced in the measuring station, while near the bottom a quasi-steady current directed towards southwest is formed. The selected water quality indicators show monthly trends consistent with the typical seasonal convective fluxes and mixing. 相似文献
613.
614.
615.
The re-use of faecal pellets in the water column before sinking to the seafloor is known as an important pathway in marine
food webs. Especially planktonic copepods seems to be actively use their faecal pellets. Since benthic copepods (order Harpacticoida)
live in the vicinity of their pellets, it remains unclear how important these pellets are for their feeding ecology. In the
present study a laboratory experiment was conducted to analyse the importance of faecal pellets for the feeding ecology of
the harpacticoid Paramphiascella fulvofasciata and its grazing pressure on two diatom species (Seminavis robusta, Navicula phyllepta). By quantifying the amount and volume of the produced faecel pellets in different treatments, it was tested to what extent
the food source and the lack of faecal pellets would influence the production of faecal pellets. We found that the grazing
pressure of P. fulvofasciata depended on the diatom density since only a top-down effect could be found on the smaller Navicula cells during its initial exponential growth phase. The grazer had a negative effect on the diatom growth and controlled the
cell density to about 4,000 cells/cm2. In spite of the fact that the addition of faecal pellets did not show a significant positive effect on the assimilation
of diatoms, the removal of faecal pellets strongly promoted the pellet production. Especially when grazing on Navicula the harpacticoid P. fulvofasciata produced significantly more and smaller faecal pellets when the pellets were removed. This outcome illustrates the need for
faecal pellets of this harpacticoid copepod when grazing on the diatom Navicula. Apart from its selection for smaller diatom cells, it was suggested that the colonisation of heterotrophic bacteria enriched
these pellets. This study is the first to indicate that trophic upgrading occurs on faecal pellets and not only on the initial
autotrophic food sources per se. 相似文献
616.
617.
618.
619.
Abnormal ventral induction may result in disorders of formation, cleavage, and midline development of prosencephalic structures. Holoprosencephaly is a developmental field defect of impaired cleavage of prosencephalon. The most widely accepted classification of holoprosencephaly recognizes three major varieties: the alobar, semilobar and lobar types, according to the severity of the malformation. The brain malformations, characterized by the fusion of the cerebral hemisphere along the midline are commonly associated with facial anomalies. Corpus callosum agenesis and septo-optic dysplasia are disorders of prosencephalic midline development, and usually have less severe presentations but still, affected subjects may suffer from neurodevelopmental retardation, and/or endocrinologic and visual disorders. In this article we report an up-to-date of pathogenesis, prenatal sonographic findings, differential diagnosis and prognosis of the aforementioned anomalies. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
620.
The controversial family Adapisoriculidae, a group of shrew-sized Paleocene mammals, had proposed relationships with insectivores,
marsupials and more recently to plesiadapiforms. Adapisoriculid remains are numerous in the early Paleocene locality of Hainin,
Belgium, and allow us a test of these different phylogenetic hypotheses. Here, we identify the first tarsal bones of adapisoriculid
mammals. The highly specialised bones indicate an arboreal mode of life with euarchontan affinity. Moreover, the tarsal bones
are morphologically very close to those of the late Cretaceous Deccanolestes from the Deccan intertrappean beds of India, and also share several characters with the Paleocene plesiadapiforms and the
extant cynocephalid dermopterans. The adapisoriculid affinities of Deccanolestes are also confirmed by tooth morphology, indicating that Deccanolestes is a primitive member of this family. These phylogenetic affinities suggest a paleobiogeographic scenario for the family
with dispersal either via East Africa or across the Tethys area. 相似文献