全文获取类型
收费全文 | 6446篇 |
免费 | 590篇 |
国内免费 | 698篇 |
专业分类
安全科学 | 1036篇 |
废物处理 | 168篇 |
环保管理 | 589篇 |
综合类 | 4216篇 |
基础理论 | 392篇 |
环境理论 | 1篇 |
污染及防治 | 336篇 |
评价与监测 | 516篇 |
社会与环境 | 198篇 |
灾害及防治 | 282篇 |
出版年
2024年 | 15篇 |
2023年 | 75篇 |
2022年 | 164篇 |
2021年 | 226篇 |
2020年 | 171篇 |
2019年 | 146篇 |
2018年 | 150篇 |
2017年 | 194篇 |
2016年 | 229篇 |
2015年 | 248篇 |
2014年 | 277篇 |
2013年 | 314篇 |
2012年 | 457篇 |
2011年 | 491篇 |
2010年 | 349篇 |
2009年 | 334篇 |
2008年 | 269篇 |
2007年 | 417篇 |
2006年 | 391篇 |
2005年 | 352篇 |
2004年 | 293篇 |
2003年 | 284篇 |
2002年 | 240篇 |
2001年 | 211篇 |
2000年 | 119篇 |
1999年 | 110篇 |
1998年 | 96篇 |
1997年 | 113篇 |
1996年 | 65篇 |
1995年 | 128篇 |
1994年 | 112篇 |
1993年 | 106篇 |
1992年 | 78篇 |
1991年 | 74篇 |
1990年 | 62篇 |
1989年 | 72篇 |
1988年 | 49篇 |
1987年 | 55篇 |
1986年 | 31篇 |
1985年 | 45篇 |
1984年 | 47篇 |
1983年 | 22篇 |
1982年 | 22篇 |
1981年 | 16篇 |
1980年 | 4篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1973年 | 4篇 |
1972年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有7734条查询结果,搜索用时 808 毫秒
521.
522.
Taslim Akhtar Muhammad Ilyas Tariq Nargis Sultana Chan Kim Wei 《International Journal of Green Energy》2017,14(6):569-574
Biodiesel is now-a-days recognized as a real potential alternative to petroleum-derived diesel fuel due to its number of desirable characteristics. However, its higher production cost resulting mainly due to use of costly food-grade vegetable oils as raw materials is the major barrier to its economic viability. Present work is an attempt to explore the potential of Eriobotrya japonica seed oil for the synthesis of biodiesel using alkali-catalyzed transesterification. Optimization of production parameters, namely molar ratio of alcohol to oil, amount of catalyst, reaction time and temperature, was carried out using Taguchi method. Fatty acid composition of both oil and biodiesel was determined using GC and H1 NMR. Alcohol to oil molar ratio of 6:1, catalyst amount of 1% wt/wt, 2 h reaction time and 50 °C reaction temperature were found to be the optimum conditions for obtaining 94.52% biodiesel. Highest % contribution was shown by the ‘amount of catalyst’ (67.32%) followed by molar ratio of alcohol to oil (25.51%). Major fuel properties of E. japonica methyl esters produced under optimum conditions were found within the specified limits of ASTM D6751 for biodiesel, hence it may be considered a prospective substitute of petro-diesel. 相似文献
523.
建立了金属冶炼进口物料的固体废物鉴别方法,并利用该方法对海关查扣的3种金属冶炼进口物料进行了固体废物鉴别。鉴别结果显示:物料1、2和3的自然属性分别为砷含量超标铜精矿、锰阳极泥、回转窑氧化锌,产生来源分别为有害物质超标的产品、污染控制设施产生的物质、有意识加工的目标产物;物料1和2属于我国禁止进口的固体废物,物料3不属于固体废物。本文建立的固体废物鉴别方法可行,可为金属冶炼进口物料的固体废物鉴别和监管提供参考。 相似文献
524.
525.
氮掺杂氧化钛的简易制备及可见光催化活性的研究 总被引:1,自引:1,他引:0
为开发对可见光响应的催化剂,以尿素为氮掺杂剂,采用简易溶胶-凝胶法制备氮掺杂氧化钛,并以2,4-DCP的降解检验其光催化活性。XRD、BET、XPS和UV-Vis漫反射光谱分析表明,随着氮/钛原子比(N/Ti)的增大,各催化剂晶粒尺寸减小,比表面积增大,锐钛矿相向金红石相的转变得到抑制,除0#样品出现金红石相外,其他催化剂均只出现锐钛矿相;掺入催化剂的N位于晶格O位点和晶格间隙,替代N和间隙N掺杂使催化剂的光吸收发生明显的红移。荧光光谱分析表明,当N/Ti在0~6范围内增加时,反应体系中·OH自由基的产生速率增加,当N/Ti增大至8时,速率则下降。相似的规律也表现在氮掺杂量对光催化活性的影响。适量氮掺杂能增强氧化钛的可见光催化活性,该改性催化剂可用于有机污染物的太阳光激催化降解。 相似文献
526.
A number of studies on the oxidation of various organic/inorganic contaminants by ferrate(VI) were reported in the 1980s and 1990s. The exploration of the use of ferrate(VI) for water and wastewater treatment has been well addressed recently. However, challenges have existed for the implementation of ferrate(VI) technology in practice due to the instability of a ferrate solution or high production cost of solid ferrate products. The research has been carried out aiming at the generation and application of ferrate(VI) in situ. This paper thus reviews ferrate chemistry and its overall performance as a water treatment chemical, discusses the factors affecting the ferrate yield efficiency using the electrochemical method, and finally, summarises the work on the production and use of ferrate in situ which is currently under study. 相似文献
527.
The hydrolysis/precipitation behaviors of Al3+, Al13 and Al30 under conditions typical for flocculation in water treatment were investigated by studying the particulates' size development, charge characteristics, chemical species and speciation transformation of coagulant hydrolysis precipitates. The optimal pH conditions for hydrolysis precipitates formation for AlCl3, PACAl13 and PACAl30 were 6.5–7.5, 8.5–9.5, and 7.5–9.5, respectively. The precipitates' formation rate increased with the increase in dosage, and the relative rates were AlCl3 ? PACAl30 > PACAl13. The precipitates' size increased when the dosage increased from 50 μM to 200 μM, but it decreased when the dosage increased to 800 μM. The Zeta potential of coagulant hydrolysis precipitates decreased with the increase in pH for the three coagulants. The iso-electric points of the freshly formed precipitates for AlCl3, PACAl13 and PACAl30 were 7.3, 9.6 and 9.2, respectively. The Zeta potentials of AlCl3 hydrolysis precipitates were lower than those of PACAl13 and PACAl30 when pH > 5.0. The Zeta potential of PACAl30 hydrolysis precipitates was higher than that of PACAl13 at the acidic side, but lower at the alkaline side. The dosage had no obvious effect on the Zeta potential of hydrolysis precipitates under fixed pH conditions. The increase in Zeta potential with the increase in dosage under uncontrolled pH conditions was due to the pH depression caused by coagulant addition. Al–Ferron research indicated that the hydrolysis precipitates of AlCl3 were composed of amorphous Al(OH)3 precipitates, but those of PACAl13 and PACAl30 were composed of aggregates of Al13 and Al30, respectively. Al3+ was the most un-stable species in coagulants, and its hydrolysis was remarkably influenced by solution pH. Al13 and Al30 species were very stable, and solution pH and aging had little effect on the chemical species of their hydrolysis products. The research method involving coagulant hydrolysis precipitates based on Al–Ferron reaction kinetics was studied in detail. The Al species classification based on complex reaction kinetic of hydrolysis precipitates and Ferron reagent was different from that measured in a conventional coagulant assay using the Al–Ferron method. The chemical composition of Ala, Alb and Alc depended on coagulant and solution pH. The Alb measured in the current case was different from Keggin Al13, and the high Alb content in the AlCl3 hydrolysis precipitates could not used as testimony that most of the Al3+ was converted to highly charged Al13 species during AlCl3 coagulation. 相似文献
528.
529.
530.
Based on shift-share method, this article employs re- gional share, structural shift and competitive shift to analyze the structural benefit and competitive position of agricultural structure in western China by comparing with agriculture, foresting, stockbreeding and fishing before and after Conversion of Farmland to Forest and Grassland (CFFG). Then authors draw following conclusion: while CFFG program has been put in practice, the agricultural structure in western China has some typical characteristics, such as growth faster, structural predominance obvious and more competitive. But the contributiveness from the competition is not too much yet, and the structural benefit of forest estate and stockbreeding are restrained. 相似文献