全文获取类型
收费全文 | 87850篇 |
免费 | 1219篇 |
国内免费 | 1083篇 |
专业分类
安全科学 | 3713篇 |
废物处理 | 3161篇 |
环保管理 | 13606篇 |
综合类 | 20965篇 |
基础理论 | 25871篇 |
环境理论 | 71篇 |
污染及防治 | 13483篇 |
评价与监测 | 5299篇 |
社会与环境 | 3478篇 |
灾害及防治 | 505篇 |
出版年
2022年 | 787篇 |
2021年 | 781篇 |
2020年 | 643篇 |
2019年 | 854篇 |
2018年 | 1090篇 |
2017年 | 1113篇 |
2016年 | 2118篇 |
2015年 | 1815篇 |
2014年 | 2565篇 |
2013年 | 9236篇 |
2012年 | 2065篇 |
2011年 | 2241篇 |
2010年 | 3199篇 |
2009年 | 3329篇 |
2008年 | 1764篇 |
2007年 | 1591篇 |
2006年 | 2084篇 |
2005年 | 2123篇 |
2004年 | 2414篇 |
2003年 | 2271篇 |
2002年 | 1811篇 |
2001年 | 2115篇 |
2000年 | 1900篇 |
1999年 | 1464篇 |
1998年 | 1358篇 |
1997年 | 1342篇 |
1996年 | 1467篇 |
1995年 | 1568篇 |
1994年 | 1450篇 |
1993年 | 1306篇 |
1992年 | 1304篇 |
1991年 | 1269篇 |
1990年 | 1227篇 |
1989年 | 1198篇 |
1988年 | 1030篇 |
1987年 | 967篇 |
1986年 | 984篇 |
1985年 | 1057篇 |
1984年 | 1147篇 |
1983年 | 1161篇 |
1982年 | 1170篇 |
1981年 | 1089篇 |
1980年 | 936篇 |
1979年 | 913篇 |
1978年 | 815篇 |
1977年 | 711篇 |
1976年 | 636篇 |
1975年 | 603篇 |
1973年 | 624篇 |
1972年 | 629篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
351.
Khan Syed Abdul Rehman Mathew Manoj Dominic P. D. D. Umar Muhammad 《Environment, Development and Sustainability》2022,24(9):10633-10665
Environment, Development and Sustainability - Environmental deterioration and global warming has created a substantial impact on international companies to incorporate eco-friendly, green supply... 相似文献
352.
Igliski B. Skrzatek M. Kujawski W. Cichosz M. Buczkowski R. 《Environment, Development and Sustainability》2022,24(1):77-111
Environment, Development and Sustainability - Renewable energy (RE) plays an increasingly important role in the economy of almost every country in the world. In order to examine the state of... 相似文献
353.
Environment, Development and Sustainability - This study describes the results of groundwater table variation in Thanjavur District before and after the monsoon seasons. Groundwater-level data... 相似文献
354.
Russian Journal of Ecology - Populations at the border of ranges are considered more vulnerable than those in the center. However, some recent reviews contradict this hypothesis. We have studied... 相似文献
355.
Russian Journal of Ecology - Abstract—We tested a hypothesis about the different abilities of alien and native plants to form arbuscular mycorrhizae. The studies were carried out in the... 相似文献
356.
Rate-temperature responses in scyphozoan medusae and polyps 总被引:1,自引:0,他引:1
The effects of temperature on oxygen consumption and spontaneous rhythmic activity have been investigated in various stages of the life histories of 3 species of jellyfish from the Chesapeake Bay, USA. All 3 species clearly show the ability to acclimate positively to temperature change. Thermal sensitivity of metabolism in the winter medusa Cyanea capillata fulva is fairly low at temperature intervals which are experienced in nature. Polyps of the two summer medusae, Chrysaora quinquecirrha and Aurelia aurita, show reduced metabolic sensitivity at temperatures normally accompanying high developmental activity and the onset of strobilation. 相似文献
357.
358.
359.
Reversible double water in oil in water (W/O/W) emulsions were developed to contain subsurface hydrocarbon spills during their remediation using surfactant flushing. Double emulsions were prepared by emulsifying CaCl2 solutions in canola oil, and subsequently by emulsifying the W/O emulsions in aqueous sodium alginate solutions. The formation of double emulsions was confirmed with confocal and optical microscopy. The double emulsions reversed and gelled when mixed with the surfactants sodium dodecyl sulfate (SDS) and cocamidopropyl betaine (CPB). Gels can act as ‘emulsion locks’ to prevent spreading of the hydrocarbon plume from the areas treated with surfactant flushing, as shown in sand column tests. Shear rheology was used to quantify the viscoelastic moduli increase (gelation) upon mixing the double emulsion with SDS and CPB. SDS was more effective than CPB in gelling the double emulsions. CPB and SDS could adsorb at the interface between water and model hydrocarbons (toluene and motor oil), lowering the interfacial tension and rigidifying the interface (as shown with a Langmuir trough). Bottle tests and optical microscopy showed that SDS and CPB produced W/O and O/W emulsions, with either toluene or motor oil and water. The emulsification of motor oil and toluene in water with SDS and CPB facilitated their flow through sand columns and their recovery. Toluene recovery from sand columns was quantitated using Gas-Chromatography Mass-Spectroscopy (GC-MS). The data show that SDS and CPB can be used both for surfactant flushing and to trigger the gelation of ‘emulsion locks’. Ethanol also gelled the emulsions at 100 mL/L. 相似文献
360.
Agata Gallipoli Camilla M. Bragugli Andrea Gianico Daniele Montecchio Pamela Pagliaccia 《环境科学学报(英文版)》2020,32(3):167-179
Biowaste valorization through anaerobic digestion is an attractive option to achieve both climate protection goals and renewable energy production. In this paper, a complete set of batch trials was carried out on kitchen waste to investigate the effects of mild thermal pretreatment, temperature regimen and substrate/inoculum ratio. Thermal pretreatment was effective in the solubilisation of macromolecular fractions, particularly carbohydrates. The ability of the theoretical methodologies in estimating hydrogen and methane yields of complex substrates was evaluated by comparing the experimental results with the theoretical values. Despite the single batch configuration, a significant initial hydrogen production was observed, prior to methane yield. Main pretreatment effect was the gain in hydrogen production; the extent was highly variable according to the other parameters values. High hydrogen yields, up to 113 mL H2/g VSfed, were related to the prompt transformation of soluble sugars. Thermophilic regimen resulted, as expected, in faster digestions (up to 78 mL CH4/gVS/day) and sorted out pH inhibition. The relatively low methane yields (342–398 mL CH4/g VSfed) were the result of the consistent lignocellulosic content and low lipid content. Thermal pretreatment proved to be a promising option for the enhancement of hydrogen production in food waste dark fermentation. 相似文献