共查询到20条相似文献,搜索用时 109 毫秒
1.
石油污染土壤修复技术进展研究 总被引:2,自引:0,他引:2
概述了土壤污染的工程修复技术,主要包括土壤气相抽吸方法、土壤清洗方法、土壤淋洗方法、热解吸方法、生物通风方法、土壤耕作法、生物堆肥方法、生物泥浆方法、植物修复方法,并指出了各自的优缺点。 相似文献
2.
3.
本文简要介绍了乙酸乙酯的性质、应用领域、生产方法、生产规模及技术水平;重点介绍了乙醛缩合方法、乙酸酯化方法、乙烯加成方法、乙醇脱氢方法等生产工艺对乙酸乙酯行业未来发展趋势进行了预测,并提出了发展建议。 相似文献
4.
5.
6.
7.
介绍了偏氟乙烯的物性和合成方法,叙述了偏氟乙烯的乳液、悬浮、溶液聚合和共聚方法.介绍了氟乙烯的物性和合成方法,叙述了氟乙烯的乳液、悬浮、本体聚合与接枝聚合方法. 相似文献
8.
纳米银具有独特的光学、电学、催化性质,而受到广泛应用。纳米银的制备方法受到了较多的关注。介绍了近年来常用制备纳米银的方法,包括物理方法、化学方法和生物还原法,概述了纳米银的研究方法,并总结了其优缺点。最后,介绍了其应用领域,并展望了纳米银研究的发展趋势和研究方向。 相似文献
9.
10.
纳米银的制备研究进展 总被引:1,自引:0,他引:1
纳米银具有独特的光学、电学、催化性质,其制备方法受到了较多的关注。综述了纳米银的制备方法,包括化学还原法、微乳液法、光化学法、电化学法、超声波还原法、溶胶-凝胶法等。介绍了这些方法的基本原理、特点和研究进展,并对这些方法进行了展望。 相似文献
11.
钒酸铋(BiVO4)黄色颜料是一种无毒、品质优良的新型无机颜料,其发展前景非常广阔。传统的合成方法分为固相法和液相法,固相法在改变颜料品质方面受限制较多,而液相法则较少。近几年科研人员开发出的液相法有:液相沉淀法,水热合成法,微波辅助加热法,微乳液法,络合法,包覆法等。文章详细介绍了这些方法的具体过程,可为有关人员作为参考。 相似文献
12.
Younggon Son 《应用聚合物科学杂志》2006,99(4):1910-1918
An experimental comparison between different techniques for the interfacial tension measurement is presented for polyamide‐6 and polystyrene pair. The techniques are transient dynamic methods, which include the breaking thread (BT) method, the imbedded fiber retraction (IFR) method, the deformed drop retraction (DDR) method, and two modified DDR methods. The modified DDR methods combine the analytical power of the DDR method with experimental simplicity of the BT and IFR methods, respectively. Interfacial tension values obtained by the modified DDR method that combines the BT method is much lower than those by the other methods. Among all techniques, the modified DDR that combines the IFR method is found to be most convenient and accurate method. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99:1910–1918, 2006 相似文献
13.
14.
In recent years a number of publications have adopted the least-squares method for chemical reactor engineering problems such as the population balance equation, fixed bed reactors and pellet equations. Evaluation of the performance of the least-squares method compared to other weighted residual methods is therefore of interest. Thus, in the present study, numerical techniques in the family of weighted residual methods; the orthogonal collocation, Galerkin, tau, and least-squares methods, have been adopted to solve a non-linear comprehensive and highly coupled pellet problem. The methanol synthesis and the steam methane reforming process have been adopted for this study.Based on the residual of the governing equations, the orthogonal collocation method obtains the same accuracy as the Galerkin and tau methods. Moreover, the orthogonal collocation method is associated with the simplest algebra theory and thus holds the simplest implementation. Another benefit of the orthogonal collocation method is that the technique is more computational efficient than the other methods evaluated. The least-squares method does not obtain the same accuracy as the other weighted residual methods. In particular, the least-squares method is not suitable for strongly diffusion limited systems that give rise to steep gradients in the pellet. On the other side, considering the spectral–element framework, the least-squares method is less sensitive to the placement of the element boundaries than observed for the orthogonal collocation, Galerkin and tau methods.The present paper outlines the algebra of the weighted residual methods and illustrate the numerical solution techniques through a simplified pellet problem. 相似文献
15.
污泥负荷法和泥龄法是活性污泥工艺设计的主要计算方法,这2种设计方法偏于安全、保守,以经验为主,没有反映出活性污泥工艺中生物反应机理,缺少理论支持,适用范围窄,而数学模型法才是活性污泥法设计的发展趋势,利用数学模型进行活性污泥工艺设计可以有2种方法选用:试算法和优化法。 相似文献
16.
碳纳米管表面改性及其应用于复合材料的研究现状 总被引:1,自引:0,他引:1
对碳纳米管进行表面改性可提高碳纳米管的表面活性、分散能力和与基体材料之间的相容性,从而提高其在复合材料中的增强效果。本文介绍了碳纳米管表面改性的方法,分为物理法和化学法,物理法主要有高能机械研磨法、高能球磨法和超声振动法;化学法主要有酸处理法、偶联剂法、化学镀法、高能射线辐照法和原子转移自由基聚合法。在实际应用中常将几种改性方法联合使用,使得到的改性产物性能更稳定,性质更多样化。同时,介绍了改性后的碳纳米管在各种复合材料中的应用现状。并指出了对碳纳米管进行改性的两个重点:一是尽量保持碳纳米管的本身结构完整性;二是提高碳纳米管在基体中的分散性。 相似文献
17.
18.
R. A. Hartwig Charles R. Hurburgh Jr. 《Journal of the American Oil Chemists' Society》1989,66(11):1635-1636
Three air-oven moisture methods, AOCS Ac 2-41, AACC 44-18 and the official USDA method, were compared on 20 samples of 1987
crop soybeans. The AOCS method is a whole-grain method, the other two are two-stage, ground-grain methods. The average difference
between the AOCS and USDA methods was 0.04 percentage points with a standard deviation of 0.18 points. The AOCS method can
be used interchangeably with the USDA method for calibration of moisture devices. The AACC method averaged 0.15 and 0.19 points
higher than the AOCS and USDA methods, respectively. 相似文献
19.
导弹战斗部任务可靠性评估方法分析 总被引:3,自引:2,他引:3
为评估技术状态不断变化的导弹战斗部的可靠性,提出了适用于成败型产品的AMSAA模型评估方法和Gompertz模型评估方法。并对某型战斗部研制阶段的试验数据进行了评估,将评估结果与传统评估方法得到的结果进行了比对。结果表明,用二项分布评估方法得到的置信下限小于用超几何分布评估方法得到的置信下限,并且都低于用AMSAA模型评估方法得到的置信下限;用传统评估方法得到的点估计值小于用Gompertz模型评估方法得到的点估计值。着重分析了用不同方法对同一试验数据进行评估时得出不同结果的原因。结果表明,由于考虑了产品的可靠性变化趋势,用AMSAA模型评估方法和Gompertz模型评估方法得出的结果更合理。 相似文献