全文获取类型
收费全文 | 111篇 |
免费 | 6篇 |
国内免费 | 21篇 |
专业分类
安全科学 | 4篇 |
废物处理 | 15篇 |
环保管理 | 9篇 |
综合类 | 69篇 |
基础理论 | 8篇 |
污染及防治 | 18篇 |
评价与监测 | 3篇 |
社会与环境 | 5篇 |
灾害及防治 | 7篇 |
出版年
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 5篇 |
2018年 | 3篇 |
2017年 | 4篇 |
2016年 | 3篇 |
2015年 | 4篇 |
2014年 | 10篇 |
2013年 | 6篇 |
2012年 | 8篇 |
2011年 | 13篇 |
2010年 | 7篇 |
2009年 | 8篇 |
2008年 | 6篇 |
2007年 | 5篇 |
2006年 | 6篇 |
2005年 | 3篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 4篇 |
1999年 | 1篇 |
1998年 | 5篇 |
1997年 | 3篇 |
1995年 | 2篇 |
1994年 | 6篇 |
1993年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有138条查询结果,搜索用时 62 毫秒
71.
Lead can be recovered from funnel glass of waste cathode ray tubes via reduction melting. While low-temperature melting is necessary for reduced energy consumption, previously proposed methods required high melting temperatures (1400 °C) for the reduction melting. In this study, the reduction melting of the funnel glass was performed at 900–1000 °C using a lab-scale reactor with varying concentrations of Na2CO3 at different melting temperatures and melting times. The optimum Na2CO3 dosage and melting temperature for efficient lead recovery was 0.5 g per 1 g of the funnel glass and 1000 °C respectively. By the reduction melting with the mentioned conditions, 92% of the lead in the funnel glass was recovered in 60 min. However, further lead recovery was difficult because the rate of the lead recovery decreased as with the recovery of increasing quantity of the lead from the glass. Thus, the lead remaining in the glass after the reduction melting was extracted with 1 M HCl, and the lead recovery improved to 98%. 相似文献
72.
Atrazine, propazine and simazine were tested separately and in mixture by batch procedure in a laboratory-constructed apparatus. 3.75 l of a buffered s-triazines pesticide solution was treated at room temperature by 325-mesh zero-valent iron powder (ZVIP) (20 g/l). High performance liquid chromatography was used to separate by-products and study the decline in the pesticide’s concentrations. Results obtained show that the order of degradation was simazine, atrazine and then propazine. The half-lives (t1/2) of the s-triazines pesticides are, respectively, 7.4, 9.0 and 10.6 min when they are treated separately, and 9.8, 11.2 and 13.7 min when they are treated together under the same conditions. The final by-product obtained after 50 min of contact of simazine with ZVIP shows a shift to longer wavelength in its UV spectrum. A similar phenomenon is shown for atrazine and propazine. Identical primary by-products are produced and subsequently degraded to 4,6-(diamino)-s-triazine, which seems to be the major by-product of the reductive treatment process. Pathways for the degradation of the studied s-triazines by ZVIP are proposed. 相似文献
73.
74.
文章对屠宰与肉类加工废水废水中的主要污染物来源、特点及对常见的两种屠宰与肉类加工废水处理工艺特点进行了阐述,通过对某大型屠宰与肉类加工企业污水处理工艺的两个不同方案进行对比分析。指出了在结合废水特征与出水指标的情况下,更为合理的屠宰与肉类加工废水处理工艺,并通过相关技术指标,论证了最佳的废水处理工艺,同时提出了屠宰与肉类加工废水可持续处理技术的观点。 相似文献
75.
Zhimin Lv Shimin Yang Lei Chen Ahmed Alsaedi Tasawar Hayat Changlun Chen 《环境科学学报(英文版)》2019,31(2):377-387
Nanoscale zerovalent iron/magnetic carbon (NZVI/MC) composites were successfully synthesized by simply calcining yellow pine and iron precursors. NZVI/MC pyrolyzed at 800°C (NZVI/MC800) had a higher percentage of NZVI and displayed better resistance to aggregation and oxidation of NZVI than samples prepared at other temperatures. The NZVI/MC800 material was applied for the elimination of U(VI) from aqueous solutions. The results suggested that the NZVI/MC800 displayed excellent adsorption capacity (203.94?mg/g) toward U(VI). The significant adsorption capacity and fast adsorption kinetics were attributed to the presence of well-dispersed NZVI, which could quickly reduce U(VI) into U(IV), trapping the guest U(IV) in the porous biocarbon matrix. The removal of U(VI) on the NZVI/MC samples was strongly affected by solution pH. The NZVI/MC samples also displayed outstanding reusability for U(VI) removal after multiple cycles. These findings indicate that NZVI/MC has great potential for remediation of wastewater containing U(VI). 相似文献
76.
黑龙江省主要气象灾害对粮食产量的影响及减灾对策 总被引:6,自引:0,他引:6
本文用1965~1992年粮食产量和气象资料,采用组合因子处理气象资料方法,定量分析了黑龙江省主要气象灾害对粮食产量的影响,并提出了相应减灾对策。 相似文献
77.
对选择性非催化还原(SNCR)烟气脱硝技术与选择性催化还原(SCR)烟气脱硝技术在流化床锅炉上应用的适应性进行了对比分析。分析结果显示,相对于SCR技术,SNCR技术更适于流化床锅炉,指出了SNCR技术在流化床锅炉上应用存在的问题,N2O难以去除。 相似文献
78.
79.
研究介绍了绿色GDP核算的核算框架;阐述了我国开展绿色GDP核算的现实意义,认为我国开展绿色GDP核算是必要且可行的;讨论了将绿色GDP核算体系作为节能减排政策制定依据的应用模式,认为绿色GDP核算能够有效地促进节能减排政策制定. 相似文献
80.
车用柴油机选择性催化还原技术研究进展 总被引:2,自引:0,他引:2
选择性催化还原技术(SCR)是目前唯一可以同时改善柴油机排放和燃油经济性的氮氧化物(NOX)净化技术,而以NH3作为还原剂的SCR技术(NH3-SCR)又是目前最成熟,最具推广前景的SCR技术。文章详细阐述了用于车用柴油机的NH3-SCR技术的反应机理,介绍了温度对SCR反应的影响;列举了典型SCR系统的主要部件并介绍了各部分的功能,以及法规中对车用尿素水溶液(AdBlue)主要指标的规定;总结了目前应用较多的开环、闭环两种控制策略的工作流程及特点,并且分析了各自的优缺点;在柴油机后处理系统集成的角度对SCR与颗粒捕集器(DPF)的两种整合方案进行了分析,对比了两种方案的优缺点;最后分析了SCR技术目前存在的几个问题。 相似文献