全文获取类型
收费全文 | 12208篇 |
免费 | 244篇 |
国内免费 | 765篇 |
专业分类
安全科学 | 294篇 |
废物处理 | 890篇 |
环保管理 | 1422篇 |
综合类 | 2480篇 |
基础理论 | 3479篇 |
污染及防治 | 2347篇 |
评价与监测 | 1132篇 |
社会与环境 | 1023篇 |
灾害及防治 | 150篇 |
出版年
2024年 | 6篇 |
2023年 | 49篇 |
2022年 | 156篇 |
2021年 | 163篇 |
2020年 | 179篇 |
2019年 | 106篇 |
2018年 | 1576篇 |
2017年 | 1489篇 |
2016年 | 1308篇 |
2015年 | 305篇 |
2014年 | 195篇 |
2013年 | 292篇 |
2012年 | 710篇 |
2011年 | 1600篇 |
2010年 | 892篇 |
2009年 | 750篇 |
2008年 | 1054篇 |
2007年 | 1374篇 |
2006年 | 122篇 |
2005年 | 133篇 |
2004年 | 111篇 |
2003年 | 131篇 |
2002年 | 154篇 |
2001年 | 53篇 |
2000年 | 57篇 |
1999年 | 44篇 |
1998年 | 51篇 |
1997年 | 28篇 |
1996年 | 15篇 |
1995年 | 27篇 |
1994年 | 18篇 |
1993年 | 14篇 |
1992年 | 11篇 |
1991年 | 7篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 11篇 |
1983年 | 9篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1935年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Bosch J 《Die Naturwissenschaften》2002,89(12):575-578
Female midwife toads (genus Alytes) emit highly variable reciprocal calls of unclear function prior to and during courtship. In some species, female-female competition, expressed as physical fighting, has been reported. Males of Majorcan midwife toads (Alytes muletensis) show phonotactic response to female calls, and females of Iberian midwife toads (Alytes cisternasii) respond differently according to the male call characteristics. In this study, I test the hypothesis of female-female acoustic competition as an additional function of female reciprocal calls. Playback tests indicate that female calls are not clearly involved in female acoustic competition in the Iberian midwife toad, therefore female calls could be directed at males rather than towards competitive females. 相似文献
72.
73.
超临界二氧化碳流体萃取土壤中有机污染物的研究进展 总被引:4,自引:0,他引:4
就近年来人们利用超临界二氧化碳流体对有机污染物污染的土壤所做的研究工作以及所取得的成果进行了总结。 相似文献
74.
75.
76.
In this study, we report a novel magnetic biomimetic nanozyme(Fe_3O_4@Cu/GMP(guanosine5′-monophosphate)) with high laccase-like activity, which could oxidize toxic ophenylenediamine(OPD) and remove phenolic compounds.The magnetic laccase-like nanozyme was readily obtained via complexed Cu~(2+)and GMP that grew on the surface of magnetic Fe_3O_4 nanoparticles.The prepared Fe_3O_4@Cu/GMP catalyst could be magnetically recycled for at least five cycles while still retaining above 70% activity.As a laccase mimic,Fe_3O_4@Cu/GMP had more activity and robust stability than natural laccase for the oxidization of OPD.Fe_3O_4@Cu/GMP retained about 90% residual activity at 90℃ and showed little change at pH 3–9, and the nanozyme kept its excellent activity after long-term storage.Meanwhile, Fe_3O_4@Cu/GMP had better activity for removing phenolic compounds, and the removal of naphthol was more than 95%.Consequently, the proposed Fe_3O_4@Cu/GMP nanozyme shows potential for use as a robust catalyst for applications in environmental remediation. 相似文献
77.
Gamergates (i.e. mated reproductive workers) are mostly known from ant species within the Ponerinae. We report here the discovery of gamergates in two species of the subfamily Myrmicinae. Until now, mated reproductive females in colonies of myrmicine species have been considered morphologically distinct from the worker caste. However, in two species of the myrmicine Metapone (Metapone madagascarica and a newly discovered, not yet described Metapone species) all workers have six ovarioles and a spermatheca; and some of them are mated. There are no morphological differences between mated and non-mated workers. Field observations and laboratory studies indicate that colonies of the Metapone species can reproduce with gamergates only. 相似文献
78.
Although amphibians are highly vocal, they generally emit only a limited number of acoustic communication signals. We report here the extraordinarily rich vocal repertoire of Amolops tormotus, a ranid species in China. These frogs produce countless vocalizations, some of which share features of birdsong or primate calls, e.g., ultrasonic frequency components, multiple upward and downward FM sweeps, and sudden onset and offset of selective harmonic components within a call note. Frame-by-frame video analysis of the frog's calling behavior suggests the presence of two pairs of vocal sacs that may contribute to the remarkable call-note complexity in this species. Electronic supplementary material to this paper can be obtained by using the Springer LINK server located at http://dx.doi.org/10.1007/s00114-002-0335-x. 相似文献
79.
印染废水是一种水质水量变化大、有机物含量高,可生化性差,COD高,色度高的难降解废水。系统地介绍了印染废水处理的应用现状及技术进展,对处理印染废水的化学法、物理法以及生物处理技术进行了综述。 相似文献
80.
Aysen Müezzinoğlu Tolga Elbir Abdurrahman Bayram 《Environmental Engineering and Policy》1998,1(2):109-116
In this study, an inventory of air pollutant emission estimates from major air polluting sources in Turkey for period between 1985 and 2005 with 5-year intervals were estimated. Inventory covers anthropogenic sources of five major air pollutants of particulate matter, sulfur dioxide, carbon monoxide, nitrogen oxides and non-methane volatile organic compounds. Their break-down with respect to main activity sectors were shown and their distribution by the largest industrial source categories were worked out as annual estimates. This inventory and its analysis point to serious environmental implications of air pollutants and a need to develop a policy plan for reducing these emissions. 相似文献