用计算机模拟送进角与辗轧角对Accu-Roll轧机变形区的影响

在建立Accu-Roll轧机变形区模型的基础上,开发出计算机模拟软件,可方便地通过变形区纵剖面计算机图象显示分析工艺参数对变形区的影响,从而为合理地选取与优化工艺参数提供依据。     

包套轧制复合法制备TA1/LY12复合板

对5座高山电视塔在自然环境下金属腐蚀与防护进行了调查和分析研究，寻求其规律性，以便在今后建设中有针对性地改进抗蚀措施，提高并延长其结构使用寿命，更好地为广播电视宣传服务。     

钢铁厂冷轧废水污泥中铬回收实验研究

钢铁厂冷轧废水污泥中含有10%以上的铬、20%以上的铁和1.5%以上的锌(均以质量分数计).为了从污泥中回收铬,首先研究了污泥中铬的形态,确定为Cr(Ⅲ);然后以碳酸钠为氧化助剂,将污泥与碳酸钠按一定比例混合后焙烧,再用水浸取.研究了碳酸钠的添加量、焙烧温度和时间、浸取时间和浸取方式对铬回收率的影响.研究表明,每克干污泥中添加0.6 g或以上碳酸钠,在固定床上700 ℃焙烧4 h以上,可实现60%以上的总铬浸出率,残渣为Fe2O3基脱硫剂原料.     

轧辊辊型曲线的计算机辅助设计

用影响函数法确定普通四辊轧机辊系的弹性变形 ,用有限单元法确定工作辊的热凸度 ,在此基础上耦合求解轧辊原始辊型曲线 ,与现场使用的辊型曲线对比表明 :该法能较准确地快速确定轧辊的原始辊型     

磷酸阳极化工艺在航空铝合金胶接领域应用进展

对比介绍了金属胶接常用表面处理工艺的特点及应用情况,着重讨论了PAA的工艺原理,并以国内航空制造企业典型PAA线为例,从装挂方式、碱清洗、脱氧处理、阳极化处理参数、水清洗等方面详细介绍了磷酸阳极化工艺生产线,分析了PAA工艺在实际生产应用过程中的控制重点,以期为航空铝合金表面磷酸阳极化技术的发展提供参考。最后提出实现PAA生产线全生命周期绿色环保节能的要求是国内学术界和产业界需共同攻关的难题。     

Preparation and characterization of PVDF-glass fiber composite membrane reinforced by interfacial UV-grafting copolymerization

A novel inorganic–organic composite membrane,namely poly(vinylidene fluoride) PVDF-glass fiber(PGF) composite membrane,was prepared and reinforced by interfacial ultraviolet(UV)-grafting copolymerization to improve the interfacial bonding strength between the membrane layer and the glass fiber.The interfacial polymerization between inorganic–organic interfaces is a chemical cross-linking reaction that depends on the functionalized glass fiber with silane coupling(KH570) as the initiator and the polymer solution with acrylamide monomer(AM) as the grafting block.The Fourier transform infrared spectrometer-attenuated total reflectance(FTIR-ATR) spectra and the energy dispersive X-ray(EDX) pictures of the interface between the glass fiber and polymer matrix confirmed that the AM was grafted to the surface of the glass fiber fabric and that the grafting polymer was successfully embedded in the membrane matrix.The formation mechanisms,permeation,and anti-fouling performance of the PGF composite membrane were measured with different amounts of AM in the doping solutions.The results showed that the grafting composite membrane improved the interfacial bonding strength and permeability,and the peeling strength was improved by 32.6% for PGF composite membranes with an AM concentration at 2 wt.%.     

Homophily and Agency: Creating Effective Sustainable Development Networks

Community networks are self-organized groupings that form for many different reasons. Some networks, connected mainly through bonding ties, are based on personal interests and relationships; others, based mainly on bridging ties, centre around broader interests. These networks form to create collective agency for engaging with social, environmental, and other issues through the concentration of social capital. The multi-scaled and evolutionary nature of sustainable development issues requires that community groups dedicated to engaging with such issues be particularly diverse, resilient, and flexible. As such, they must build a large number of bridging ties leading to external resources and limit the potential for bonding ties to impose constraining norms upon the group. Over time, however, volunteer groups tend towards a state of homophily, the tendency of groups to form from similar actors and then become more similar with time. This tendency leads to a decrease in the number of the bridging ties that help to provide group agency. Homophily must be actively recognized within community sustainable development groups if they are to remain effective over the long term. This paper suggests methods to prevent and control group homophily drawn from experience in forming small, time-limited sustainable development networks. Readers should send their comments on this paper to: BhaskarNath@aol.com within 3 months of publication of this issue     

聚烯丙基磺酸钠接枝空心玻璃微珠的制备及其吸附性能研究

通过将烯丙基磺酸钠（SAS）和硅烷偶联剂接枝到空心玻璃微珠表面,制备出新型空心玻璃微珠基吸附剂（KNH-g-PSAS）并采用扫描电子显微镜,能量分散光谱,X射线光电子能谱,傅里叶变换红外光谱,热重分析和X射线衍射仪等对其进行了充分的表征,显示了SAS的成功接枝.此外,系统地研究了溶液的pH值,接触时间,初始浓度和温度对KNH-g-PSAS吸附阳离子染料的影响.准二级动力学模型和Langmuir等温线模型分别很好地描述了吸附动力学和吸附等温线,表明吸附是发生在吸附剂表面且均匀的单层吸附.吸附实验表明,在最佳条件下,KNH-g-PSAS对碱性品红、金胺O、结晶紫和孔雀石绿的吸附能力分别为2247.19mg/g,2317.46mg/g,2557.54mg/g,2808.98mg/g.KNH-g-PSAS具有出色的自上浮性能和回收表现.     

铝合金蒙皮光固化胶接修补疲劳性能实验研究

光固化胶接修补是一项应急快速修补新技术,为检验和提高修补疲劳强度,以LY-12铝合金裂纹板为修补对象,进行了光固化修补与传统的铆接修补拉伸疲劳对比实验。实验采用等幅高频加载和按某型飞机机翼疲劳载荷谱加载2种方法,结果表明,全宽度光固化胶接修补等幅高频疲劳寿命和载荷谱疲劳寿命与等强度铆接修补相比分别延长了35.37%和9.00%。     

阳极氧化在铝合金表面粘接技术中的应用综述

铝及其合金以优良的特性而被广泛地应用于建筑、交通、机械制造等领域,作为结构材料需要进行粘接的场合也越来越多。铝合金构件在粘接前需进行表面预处理以提高其表面的粘接性能。介绍了阳极氧化在改善铝合金表面粘接性能方面的应用,并对其特点、成膜机理、膜层结构及粘接性能等进行了综述。