全文获取类型
收费全文 | 21507篇 |
免费 | 239篇 |
国内免费 | 160篇 |
专业分类
安全科学 | 582篇 |
废物处理 | 820篇 |
环保管理 | 2671篇 |
综合类 | 3901篇 |
基础理论 | 5200篇 |
环境理论 | 13篇 |
污染及防治 | 5293篇 |
评价与监测 | 1434篇 |
社会与环境 | 1841篇 |
灾害及防治 | 151篇 |
出版年
2022年 | 181篇 |
2021年 | 196篇 |
2020年 | 137篇 |
2019年 | 184篇 |
2018年 | 294篇 |
2017年 | 353篇 |
2016年 | 480篇 |
2015年 | 374篇 |
2014年 | 560篇 |
2013年 | 1788篇 |
2012年 | 680篇 |
2011年 | 877篇 |
2010年 | 709篇 |
2009年 | 796篇 |
2008年 | 896篇 |
2007年 | 960篇 |
2006年 | 868篇 |
2005年 | 735篇 |
2004年 | 705篇 |
2003年 | 689篇 |
2002年 | 620篇 |
2001年 | 738篇 |
2000年 | 586篇 |
1999年 | 319篇 |
1998年 | 252篇 |
1997年 | 253篇 |
1996年 | 255篇 |
1995年 | 284篇 |
1994年 | 265篇 |
1993年 | 255篇 |
1992年 | 260篇 |
1991年 | 252篇 |
1990年 | 266篇 |
1989年 | 223篇 |
1988年 | 186篇 |
1987年 | 166篇 |
1986年 | 195篇 |
1985年 | 192篇 |
1984年 | 200篇 |
1983年 | 189篇 |
1982年 | 198篇 |
1981年 | 194篇 |
1980年 | 188篇 |
1979年 | 185篇 |
1978年 | 129篇 |
1977年 | 145篇 |
1974年 | 133篇 |
1973年 | 121篇 |
1972年 | 140篇 |
1971年 | 110篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
711.
Ilya?A.?VolodinEmail authorView authors OrcID profile Elena?V.?Volodina Roland?Frey Vadim?E.?Kirilyuk Sergey?V.?Naidenko 《Die Naturwissenschaften》2017,104(5-6):50
In neonate ruminants, the acoustic structure of vocalizations may depend on sex, vocal anatomy, hormonal profiles and body mass and on environmental factors. In neonate wild-living Mongolian gazelles Procapra gutturosa, hand-captured during biomedical monitoring in the Daurian steppes at the Russian-Mongolian border, we spectrographically analysed distress calls and measured body mass of 22 individuals (6 males, 16 females). For 20 (5 male, 15 female) of these individuals, serum testosterone levels were also analysed. In addition, we measured relevant dimensions of the vocal apparatus (larynx, vocal folds, vocal tract) in one stillborn male Mongolian gazelle specimen. Neonate distress calls of either sex were high in maximum fundamental frequency (800–900 Hz), but the beginning and minimum fundamental frequencies were significantly lower in males than in females. Body mass was larger in males than in females. The levels of serum testosterone were marginally higher in males. No correlations were found between either body mass or serum testosterone values and any acoustic variable for males and females analysed together or separately. We discuss that the high-frequency calls of neonate Mongolian gazelles are more typical for closed-habitat neonate ruminants, whereas other open-habitat neonate ruminants (goitred gazelle Gazella subgutturosa, saiga antelope Saiga tatarica and reindeer Rangifer tarandus) produce low-frequency (<200 Hz) distress calls. Proximate cause for the high fundamental frequency of distress calls of neonate Mongolian gazelles is their very short, atypical vocal folds (4 mm) compared to the 7-mm vocal folds of neonate goitred gazelles, producing distress calls as low as 120 Hz. 相似文献
712.
713.
敌敌畏农药是一种广泛使用的中等毒性的有机磷农药,采用传统方法测定难以满足现场测定的需要。试验以戊二醛为交联剂制备了一种基于丁酰胆碱脂酶的ISFET(离子敏场效应管)生物传感器,并将其应用于敌敌畏的测定,考察了不同pH值、底物浓度、抑制时间等对传感器响应(电压)值的影响,得到了最佳测定条件。 相似文献
714.
Cristina E. Almeida-Naranjo Bryan Morillo María B. Aldás Nicole Garcés Alexis Debut Victor H. Guerrero 《补救:环境净化治理成本、技术与工艺杂志》2023,33(2):135-150
The removal of heavy metals from wastewater has become a global challenge, which demands the continuous study of efficient and low-cost treatment alternatives such as adsorption. In this research, the removal of zinc was evaluated using batch adsorption processes with nonconventional materials such as graphene oxide (GO), magnetite (MG), and their composites (GO:MG), formulated with three weight ratios (2:1, 1:1, and 1:2). Graphene was synthesized by the modified Marcano method, using pencil lead graphite as a precursor. MG and the composites were synthesized by chemical coprecipitation of ferrous sulfate and ferric chloride. The materials were characterized by Raman and Fourier transform infrared spectroscopies, scanning electron microscopy, X-ray diffraction, and the Brunauer–Emmett–Teller method to determine the functional groups, microstructural and morphological characteristics, and specific surface area. Batch adsorption tests were carried out to optimize the adsorbent dose and contact time with zinc solutions of 10 ppm. Zinc adsorption reached equilibrium at 2 h, with an optimal dose between 0.25 and 1.0 g/L. The maximum zinc removal efficiencies/adsorption capacities were 98.6%/165.6, 83.4%/47.6, 83.5%/21.9, 72.8%/19.9, and 82.2%/9.25 mg/g using GO, 2GO:1MG, 1GO:1MG, 1GO:2MG, and MG, respectively. Furthermore, the analysis of the isotherm and adsorption kinetics models determined that the adsorption processes using MG and the composites fit the Sips and pseudo-second-order models. 相似文献
715.
Junga Petr Trávníček Petr Suchý Pavel Kotek Luboš Vítěz Tomáš 《Journal of Material Cycles and Waste Management》2023,25(1):288-301
Journal of Material Cycles and Waste Management - This work focuses on the issue of emergency prevention in the operation of municipal solid waste landfills. In this work, an emergency is... 相似文献
716.
Canhada João C. S. Paiva Fábio F. G. Shinohara Gabriel M. M. Okimoto Fernando Hiranobe Carlos T. Teixeira Silvio R. Job Aldo E. Santos Renivaldo J. 《Journal of Material Cycles and Waste Management》2023,25(2):944-953
Journal of Material Cycles and Waste Management - Leather production is a technology that boosts the economy because of its versatility and durability. However, the wastes generated throughout the... 相似文献
717.
Lunag Marcelino N. Abana Alexander S. Agcaoili Juco P. Arellano Jillien Kaith T. Caluza Coleen Angela G. Decena Nick Brylle V. Paz Emmanuel R. Dela Delgado Lyka Angela B. Obero Aaron F. Ocampo Don Miguel E. Sacdalan Charlene Ann D. 《Journal of Material Cycles and Waste Management》2023,25(2):1216-1226
Journal of Material Cycles and Waste Management - The daily use of facemask to prevent virus transmission increases the negative effect on the environment because of improper waste disposal. Due to... 相似文献
718.
Fedorov N. I. Martynenko V. B. Zhigunova S. N. Mikhailenko O. I. Shendel’ G. V. Naumova L. G. 《Russian Journal of Ecology》2021,52(2):118-125
Russian Journal of Ecology - Changes in the distribution of broadleaf tree species—Tilia cordata Mill., Quercus robur L., Acer platanoides L., and Ulmus glabra Huds.—in the central part... 相似文献
719.
Russian Journal of Ecology - The long-term dynamics (over more than 70 years) of pike infection by cestodes Triaenophorus crassus and T. nodulosus in the Rybinsk Reservoir (the Volga River) has... 相似文献
720.
Zadubrovskiy P. A. Vasina A. V. Novikova E. V. Kondratyuk E. Yu. Matskalo L. L. Novikov E. A. 《Russian Journal of Ecology》2021,52(4):283-289
Russian Journal of Ecology - To test the hypothesis that animals from habitats exposed to high anthropogenic pressure are more successful in adapting to captivity, immature narrow-skulled voles... 相似文献