改装天然气汽车操纵稳定性的分析

以某改装天然气汽车(CNGV)为例,通过对质心位置的测量得到了该车的基本物理参数,利用MATLAB/SIMULINK软件建立了汽车操纵稳定性仿真模型,并对改装前后汽车的操纵稳定性进行了分析。结果表明,该车在改装成天然气汽车后操纵稳定性变差,且在以前安全行驶的胎压下出现了过多转向,为今后天然气汽车的改装提供了重要的理论依据。     

DPB滞火剂的配制及其性能的研究

研究由双氰胺、磷酸和硼酸组成的滞火剂配方及其滞火性能。在室温和大气压下将滞火剂溶液注入木材并沉积在木材组织中。测试结果表明,处理后的木材具有优良的滞火性能;并且具有抗沥出、吸湿性低等特点;其体积稳定性和弯曲强度也有改善;对油漆涂饰无不利影响;这种滞火剂易于配制和便于工业利用。     

改性酚醛树脂胶合高含水率单板

采用常规酚醛树脂胶压制多层结构胶合板时，单板含水率通常要求在８％以下，本项研究通过缩合物的共混－共缩聚方法，采用间苯二醛树脂对酚醛树脂进行改性，探讨了间苯二酚树脂的加入量、酚醛树脂摩尔比、混合比，热压条件等对胶液的粘度，缩合度、稳定性，固化时间，及胶合质量的影响，结果表明，当单板含水率提高到１６％￣１８％时，生产的结构胶合板物理力学性能指标达到了ＧＢ９８４６．１￣１２－８８对Ⅰ类胶合板的要求，并大     

Effect of polyester fabric through electroless Ni-P plating

Process for electroless nickel-phosphorous (Ni-P) plating has been investigated as a metallizing treatment technology on polyester fabric. The microstructure and mechanical performance of Ni-P-plated polyester fabric are investigated in this study. Surface modifications of Ni-P-plated polyester fiber were studied by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The changes in weight and thickness of the Ni-P-plated polyester fabric were determined through direct measurements. Systematic investigations, including bending rigidity, tearing strength, tensile strength, elongation at break, air permeability, wettability and absorbency, and anti-static property were conducted on untreated and metallized polyester fabrics. A thorough discussion and quantitative report were made on the specific performance of the Ni-P-plated polyester fabric.     

吸附剂处理印染废水最新应用研究进展

印染废水是我国目前主要有害、难处理的工业废水之一。利用吸附剂处理印染废水具有应用范围广、处理效果好、可重复使用等特性。介绍了在活性炭、纤维素、壳聚糖、海绵铁等不同类型吸附剂结构和性质的基础上,着重讨论了对其改性的研究和应用,并对改性吸附剂的应用前景作了进一步的展望。     

Development of a technique for Lake Habitat Survey (LHS) with applications for the European Union Water Framework Directive

• 1. In the absence of a standard procedure for characterizing the physical habitat of lakes in Europe, this paper describes the development of a multi‐purpose Lake Habitat Survey (LHS). The technique has been designed to meet the hydromorphological assessment needs of the Water Framework Directive (WFD), as well as to assist in monitoring the condition of designated sites in the UK and for wider application in environmental impact assessments and restoration programmes.
• 2. LHS involves detailed recording of shoreline features at a number of plots (Hab‐Plots), complemented by a meso‐scale survey of the entire lake, including shoreline characteristics and pressures, and modifications to the hydrological regime. A temperature and dissolved oxygen profile is also compiled at the deepest point of the lake (Index Site). Existing databases are exploited where possible, and remote sensing data (e.g. aerial photographs) are used to assist field‐based observations.
• 3. Initial field trials demonstrated that the consistency of the method, whether conducted by boat or on foot, was high. More than 250 surveys were carried out across the UK in 2004 through collaboration with the statutory environment and conservation agencies.
• 4. Two levels of complexity were tested — a full version requiring 10 Hab‐Plots and an abridged version, LHS_core, involving four plots and omitting the Index Site. While 8–10 plots were required to capture the full diversity of features at complex sites, LHS_core data were sufficient to generate metrics for classification purposes.
• 5. A Lake Habitat Modification Score (LHMS) may be calculated from LHS data. This synthesizes a wide array of hydromorphological and human pressures and has direct applications for assessment of ecological status under the WFD. Preliminary analysis illustrates a spectrum of hydromorphological alteration of 82 lakes in the UK.
• 6. Further considerations are discussed, including the prospect that the LHS protocol might form the basis of a European standard developed through CEN (Comité Européen de Normalisation).

Copyright © 2006 John Wiley & Sons, Ltd.     

改性三聚氰胺树脂对重组竹表面开裂的影响

采用乙二醇和丙烯酰胺来改性三聚氰胺树脂,制备低分子树脂浸渍重组竹,从而来减少重组竹表面开裂。结果表明,当丙烯酰胺的加入量为树脂质量的6%,乙二醇与甲醛的摩尔比为1.5:1时,能够有效地降低重组竹表面的开裂情况。黏度越低,树脂对重组竹表面的润湿性越好,接触角越小,浸润速度越快。     

改性稻草/高密度聚乙烯复合材料的工艺性能

以改性稻草和高密度聚乙烯(HDPE)为原料,研究了改性稻草/HDPE复合材料的热压工艺,分析了稻草改性用NaOH溶液质量分数、热压时间、HDPE加入比例等因素对复合板材性能的影响.结果表明,热压最佳工艺参数为:密度0.75g/cm~3,施胶量4%,热压温度160℃,热压时间6min,HDPE加入比例30%,NaOH溶液质量分数2.5%.在此条件下制作的改性稻草/HDPE复合材料力学性能达到刨花板国家标准GB/T 4897-2003要求.     

速生杉木的改性研究——UF树脂浸渍后热压法改性

采用脲醛树脂（UF）浸渍后热压的方法，对速生杉木气干材进行改性。试验结果表明：1.改性后杉木的静曲强度平均提高42%，弹性模量平均提高17%，吸水率平均降低45%，吸水厚度膨胀率基本无变化；2.热压工艺中的压力对改性杉木的MOR，MOE影响最大，树脂浸渍时间是影响其吸水率和吸水厚度膨胀率的主要因素。     

马尾松含脂及改性研究

马尾松含脂及改性研究主要是改变松材的脂含量及其性质，克服松材易变形、开裂、溢脂的缺陷，达到作为工业用材标准的目的。它可以通过添加化学药品的物化抽提法或优良溶剂萃取法实现，从中探索简单易行的工业生产法。