铝型材加工熔铸烟尘净化技术研究--以某铝业公司工程为例

我国铝型材行业最近几年发展迅猛,无论是产量还是生产规模,都居有色金属之首。但是,由于该行业的环境保护工作还相对落后,很大程度地制约了企业的发展扩大。本文通过对铝型材行业熔炼时产生的废气治理技术的分析,结合某铝业有限公司相关的工程实例,得出一套有效的废气治理工艺技术,从而实现铝型材行业高速发展和环境保护的相互统一。     

基于国家钻石模型的我国电解铝产业国际竞争力研究

文章在介绍产业国际竞争力概念和国家钻石模型的基础上,用国家钻石模型分析了影响我国电解铝工业国际竞争力的因素,并提出了提升我国电解铝工业国际竞争力的几点措施。     

热镀锌 GI 锌锅的铝含量稳定控制研究

结合马钢第四钢轧总厂1#和2#镀锌线投产四年来的生产实践,对热浸镀锌的锌锭添加控制现状进行了分析,重点探讨了辟锅铝含量的消耗及其影响因素,分析了国内外的锌锭添加方法,提出在实际生产中从工艺和操作上采取措施进行控制,合理添加锌锭。减少了GI锌锅的成分波动。     

4032铝合金销轴热挤压成形过程的有限元分析

基于DEFORM-3D有限元分析软件,采用刚黏塑性热力耦合有限元模拟技术,对4032铝合金销轴热挤压成形过程进行了模拟与分析,获得了金属流动、挤压载荷、等效应变以及坯料内部温度等相关场量的变化规律。结果表明：4032铝合金销轴热挤压变形时,坯料心部金属的流动速度大于表层金属;内部变形可分为4个区域,即未变形区、变形区、已变形区和死区;坯料在凹模模口附近变形最为剧烈,挤压载荷急剧增加,等效应变梯度最大,局部温升明显。     

三聚磷酸铝的制备及应用

三聚磷酸铝性质特别,用途广泛。文章介绍了三聚磷酸铝的制备方法及其一些应用领域。     

自抗扰控制技术在铝电解过程控制中的应用

针对铝电解控制系统的大滞后、大惯性以及动态特性随工况变化的不确定性等特点,本文提出了ADRC技术的氧化铝浓度控制方案。该控制方案能使铝电解过程很快进入稳态,超调量较小,提高了铝电解过程的动态和稳态性能。     

Transgenic barley with overexpressed PTrx increases aluminum resistance in roots during germination

A transgenic barley line (LSY-11-1-1) with overexpressed Phalaris coerulescens thioredoxin gene (PTrx) was employed to measure the growth, protein oxidation, cell viability, and antioxidase activity in barley roots during germination on the presence of 2 mmol/L AlCl₃ on filter paper. The results show that (1) compared with the non-transgenic barley, LSY-11-1-1 had enhanced root growth, although both were seriously inhibited after AlCl₃ treatment; (2) the degree of protein oxidation and loss of cell viability in roots of LSY-11-1-1 were much less than those in roots of non-transgenic barley, as reflected by lower contents of protein carbonyl and Evans blue uptakes in LSY-11-1-1; (3) activities of catalase (CAT), glutathione peroxidase (GPX), ascorbate peroxidase (APX), and glutathione reductase (GR) in LSY-11-1-1 root tips were generally higher than those in non-transgenic barley root tips, although these antioxidase activities gave a rise to different degrees in both LSY-11-1-1 and non-transgenic barley under aluminum stress. These results indicate that overexpressing PTrx could efficiently protect barley roots from oxidative injury by increasing antioxidase activity, thereby quenching ROS caused by AlCl₃ during germination. These properties raise the possibility that transgenic barley with overexpressed PTrx may be used to reduce the aluminum toxicity in acid soils.     

两种缓冲液条件下人血清蛋白醋酸纤维薄膜电泳结果的比较

设定相同的实验条件,对巴比妥缓冲液和硼酸盐缓冲液两种电泳结果进行比较．巴比妥缓冲液条件下,样液扩展的总长度为3．5cm,可以清晰显示4条色带;硼酸盐缓冲液条件下,样液扩展的总长度为4．5cm,可以清晰显示5条色带．另外,在实验成本及对环境的污染方面,硼酸盐缓冲液也优于巴比妥缓冲液．因此,开展人血清蛋白醋酸纤维薄膜电泳实验,硼酸盐缓冲液完全可以替代巴比妥缓冲液．     

硼酸铝晶须的自诱导合成与表征

以纤维状的碱式碳酸铵铝(AACH)和硼酸为原料,在150℃左右发生低热固相反应,得到铝氧骨架上含有部分硼酸基团的纤维状中间体,接着在助熔剂硫酸钾的存在下将中间体在1100℃焙烧4h,得到反应混合物,用热水洗去该混合物中的可溶性助熔剂,烘干后得到产物。经XRD及SEM表征,证实该产物为直径分布均匀的硼酸铝晶须,晶须的平均直径为0．3um长度平均为15um．鉴于AACH在较低温度分解得到活性氧化铝时还保持着纤维状的形状以及这一温度硼酸基已接到铝氧骨架上的事实,初步提出了原位诱导合成硼酸铝晶须的生长机理。     

Preparation of AlN thin films for film bulk acoustic resonator application by radio frequency sputtering

Aluminum nitride （AlN） thin films with high c-axis orientation have been prepared on a glass substrate with an Al bottom electrode by radio frequency （RF） reactive magnetron sputtering. Based on the analysis of Berg＇s hysteresis model, the improved sputtering system is realized without a hysteresis effect. A new control method for rapidly depositing highly c-axis oriented AlN thin films is proposed. The N2 concentration could be controlled by observing the changes in cathode voltage, to realize the optimum processing condition where the target could be fixed stably in the transition region, and both stoichiometric film composition and a high deposition rate could be obtained. Under a 500 W RF power of a target with a 6 cm diameter, a substrate temperature of 450 ℃, a target-substrate distance of 60 mm and a N2 concentration of 25%, AlN thin film with preferential （002） orientation was deposited at 2.3 μm/h which is a much higher rate than previously achieved. Through X-ray diffraction （XRD） analysis, the full width at half maximum （FWHM） of AlN （002） was shown to be about 0.28°, which shows the good crystallinity and crystal orientation of AlN thin film. With other parameters held constant, any increase or decrease in N2 concentration results in an increase in the FWHM of AlN.