全文获取类型
| 收费全文 | 2099篇 |
| 免费 | 790篇 |
| 国内免费 | 101篇 |
专业分类
| 安全科学 | 205篇 |
| 废物处理 | 99篇 |
| 环保管理 | 148篇 |
| 综合类 | 1238篇 |
| 基础理论 | 429篇 |
| 环境理论 | 1篇 |
| 污染及防治 | 384篇 |
| 评价与监测 | 421篇 |
| 社会与环境 | 47篇 |
| 灾害及防治 | 18篇 |
出版年
| 2025年 | 15篇 |
| 2024年 | 82篇 |
| 2023年 | 78篇 |
| 2022年 | 96篇 |
| 2021年 | 81篇 |
| 2020年 | 102篇 |
| 2019年 | 82篇 |
| 2018年 | 88篇 |
| 2017年 | 95篇 |
| 2016年 | 134篇 |
| 2015年 | 135篇 |
| 2014年 | 144篇 |
| 2013年 | 233篇 |
| 2012年 | 180篇 |
| 2011年 | 170篇 |
| 2010年 | 119篇 |
| 2009年 | 139篇 |
| 2008年 | 80篇 |
| 2007年 | 154篇 |
| 2006年 | 123篇 |
| 2005年 | 104篇 |
| 2004年 | 78篇 |
| 2003年 | 90篇 |
| 2002年 | 57篇 |
| 2001年 | 57篇 |
| 2000年 | 44篇 |
| 1999年 | 43篇 |
| 1998年 | 40篇 |
| 1997年 | 22篇 |
| 1996年 | 32篇 |
| 1995年 | 20篇 |
| 1994年 | 14篇 |
| 1993年 | 21篇 |
| 1992年 | 10篇 |
| 1991年 | 11篇 |
| 1990年 | 5篇 |
| 1989年 | 4篇 |
| 1988年 | 3篇 |
| 1987年 | 3篇 |
| 1986年 | 1篇 |
| 1975年 | 1篇 |
排序方式： 共有2990条查询结果，搜索用时 15 毫秒
1.
Friday O. Ochedi;John Andresen;Mijndert van der Spek; 《Greenhouse Gases: Science and Technology》2024,14(6):1025-1036
Potassium hydroxide and potassium carbonate, being cost-effective and environmentally friendly CO2 capture solvents, are promising candidates for carbon capture applications. Their slow absorption kinetics, however, necessitate strategies to enhance their rates, thereby reducing the capital costs of absorption equipment and saving energy for regenerating large volumes of solvent. Glycine, a potential additive, is explored for this purpose. While glycine-based solvents are more stable than MEA, their amino functional group renders them susceptible to oxidative degradation. This study investigates the degradation of these solvents and the influence of potassium hydroxide and potassium carbonate on their stability. The experiment was performed under 100% O2 at 90 °C and 3 bar for about 3 weeks. It was observed that glycinate degraded by 53% for the glycinate-only solution. The results also show that the addition of potassium hydroxide and potassium carbonate to a glycinate-only solution had a mixed effect on the degradation of glycinate. Potassium hydroxide increased degradation by 5% compared to the glycinate-only solution, while potassium carbonate decreased degradation by 4%. This order is supported by the degradation rate constants. Meanwhile, under N2, no significant change was observed in glycine concentration. Glycine's susceptibility to oxidative degradation is likely attributed to its less compact and rigid structure, resulting in weaker bonding and increased vulnerability to external factors. This instability leads to the formation of formate, carbonate, acetate, and oxalate as the primary degradation products across all studied solutions. A proposed mechanism for glycinate oxidative degradation sheds light on this process. These findings are crucial for informed decision making regarding performance trade-offs in point source carbon capture and direct air capture, where oxygen is a prevalent gas component and potassium-based solutions are commonly employed as absorbents. © 2024 Society of Chemical Industry and John Wiley & Sons, Ltd. 相似文献
2.
冶金炉的铁水、钢水温度高,国内外多次发生冶金炉爆炸事故,但现阶段根据《重大危险源辨识》(GB18218-2000)和《关于开展重大危险源监督管理工作的指导意见》(安监管协调字[2004]56号文)还无法判定其是否为重大危险源.运用爆炸学、热学等方法,提出了判定冶金炉是否为重大危险源的理论与方法,并给出了判定高炉是否为重大危险源的临界有效容积,判定转炉、混铁炉是否为重大危险源的临界公称吨位,最后通过VB编程对冶金炉进行了爆炸事故后果模拟,为冶金企业提供一定的参考价值. 相似文献
3.
提出运用高压变频技术实现电弧炉除尘风机变频调速的工艺.在70 t ABB电弧炉烟气治理运用中,以温度为调速系统主要控制参数,设计工频和变频两套系统,实现除尘风机的转速按工艺要求调节,其功率因数从0.83提高到0.97,除尘系统节电60%,冶炼工况同时也得到改善.表明该工艺具有广阔的应用前景. 相似文献
4.
出铁场除尘系统在投产初期烟气捕集效果明显,随着运行时间的延长,系统阻力增加,风量衰减,最终导致烟气捕集效果下降,在高炉厂房外烟气外溢现象时有发生.从除尘系统的设计入手,对运行中存在的问题进行了分析,提出了解决问题的建议. 相似文献
5.
Zhen Cheng Xinghua Qiu Xiaodi Shi Xing Jiang Tong Zhu 《Frontiers of Environmental Science & Engineering》2023,17(4):45
6.
Francisco M. Baena-Moreno Mónica Rodríguez-Galán Fernando Vega Luis F. Vilches Benito Navarrete 《International Journal of Green Energy》2019,16(5):401-412
Biomethane production through biogas upgrading is a promising renewable energy for some industries which could be part of the equilibrium needed with fossil fuels consumption to achieve a sustainable society. This paper presents a comprehensive list of biogas upgrading technologies focused on carbon dioxide removal as well as recent advances reported by researcher with wide expertise in this topic. Additionally, an extensive costs–performance comparison among the technologies studied is discussed. Among the different alternatives, chemical scrubbing stood out to achieve high biomethane purities while cryogenic technologies proved to be effective against methane losses. Regarding the different costs, water scrubbing and membrane separation seem to be the most affordable techniques. 相似文献
7.
原子吸收法测定铜检出限的测量不确定度评估 总被引：1，自引：0，他引：1
对原子吸收法测定铜检出限的测量不确定度进行分析探讨,建立了不确定度的评估方法。影响铜检出限测量不确定度的主要因素包括标准溶液不确定度;拟合曲线不确定度;检测仪器不确定度;吸光值量化误差不确定度等,提供了上述各因素的计算方法及过程。 相似文献
8.
Effects of Starch Moisture on Properties of Wheat Starch/Poly(Lactic Acid) Blend Containing Methylenediphenyl Diisocyanate 总被引：2，自引：0，他引：2
Methylenediphenyl diisocyanate was found to improve the interfacial interaction between poly(lactic acid)(PLA) and granular starch. The objective of this research was to study the effect of starch moisture content on the interfacial interaction of an equal-weight blend of wheat starch and PLA containing 0.5% methylenediphenyl diisocyanate by weight. Starch moisture (10% to 20%) had a negative effect on the interfacial binding between starch and PLA. The tensile strength and elongation of the blend both decreased as starch moisture content increased. At 20% moisture level, the starch granules embedded in the PLA matrix were observed to be swollen, resulting in poor strength properties and high water absorption by the blend. 相似文献
9.
Richard H. Fuller Robert C Averett 《Journal of the American Water Resources Association》1975,11(5):946-952
ABSTRACT: Copper sulfate has been used extensively in the California Aqueduct to control phytoplankton and the alga Cladophora. Since 1969 more than 250,000 pounds of copper sulfate has been added to a part of the aqueduct. Although copper sulfate is effective in controlling algae, copper tends to accumulate in the system in which it is applied. Samples of water, biota including plants, clams, and snails, as well as sediment were analyzed for copper. Results of these analyses showed that copper concentrations in the water, with three exceptions, were less than 10 micrograms per litre. Samples of plant tissue showed a 198 percent increase in copper concentration in the treated reach of the aqueduct, and clam tissue showed a 68 percent increase. Snails in the treated reach had 77 percent more copper than in the untreated reach whereas copper concentrations in the sediment doubled. None of the concentrations found are considered to be harmful to the biota. 相似文献
10.