铁电极表面2,2’-联吡啶-5,5’-二羧酸盐自组装膜缓蚀性能研究

缓蚀剂分子在金属表面自组装成膜是金属防腐的一种重要方法。选用2,2’-联吡啶-5,5’-二羧酸盐(bpydc)作为缓蚀剂,通过自组装法在铁电极表面形成保护膜。利用电化学法和理论计算相结合,从宏观和微观两个层面研究bpydc在铁电极表面的缓蚀效能以及作用机理。结果表明,bpydc对铁的缓蚀效率达到90.93%,属于阳极型缓蚀剂。理论计算证明bpydc符合优异缓蚀剂的标准,分子中羧基氧原子具有较负的电荷更易吸附在铁电极表面,与全反射红外光谱测试结果一致。     

SD-WAN在企业中的应用分析

在以往企业都是通过MPLS-VPN技术与企业分支机构进行专线网络沟通，但是随着市场竞争压力增大，企业生产规模增大，传统管道通信系统逐渐老化，企业服务流量、信息数据及存储方面要求也日益提高。基于此，本文将以SD-WAN在企业组网中的应用作为探究对象，首要阐述SD-WAN定义及特点，其次对SD-WAN组网模式与传统WAN之间存在的差异性进行分析，并探究企业应用SD-WAN组网模式的积极意义，最后结合某公司传统专线网络模式存在的问题进行分析，并总结SD-WAN技术在企业组网中的具体应用。     

改进的遗传算法在混流固定比例流水线排产问题中的应用

混流固定比例流水线是一种广泛应用于电冰箱、电热水器等家用电器生产的流水线生产方式，其主要的特点是多种产品在多条流水线上同时生产，但是产品的产量受各流水线分配用于生产该产品的生产夹具数所限制，因此对于这种流水线生产方式的排产问题不但需要考虑有限的生产夹具的合理分配，还要求实现企业的某种生产目标，比如实现单台产品平均成本最低。混流固定比例流水线的排产问题是典型的NP——完全类组合优化问题，即使生产规模较小时也很难求出其精确的最优解，而近年发展起来的遗传算法对该类问题的求解具有较为显著的优势。遗传算法…     

PSS／PAH聚电解质复合纳滤膜制备及其性能研究

采用LbL法在多孔PES基膜上制备了PSS／PAH聚电解质复合纳滤膜，利用SEM研究了复合膜的表面形貌，使用ATR-IR研究了复合膜在PES基膜上的生长规律，并研究了双层膜层数和组装时间对其离子截留性能的影响．研究表明，所制复合纳滤膜对不同的盐溶液的离子截留性能差异显著．如[PSS／PAH]5膜对1000mg／L的MgSO4溶液的截留率可达90％，但对1000mg／L的NaCl溶液的截留率仅为33％，故可应用于水溶液中一、二价离子的分离。     

Preparation and CO conversion activity of ceria nanotubes by carbon nanotubes templating method

Ceria nanotubes with high CO conversion activity by means of carbon nanotubes as removable templates in the simple liquid phase process were fabricated under moderate conditions. The pristine CNTs were first pretreated by refluxing in a 30% nitric acid solution at 140 ℃ for 24 h, then dispersed in an ethanolic Ce（NO3）3.6H2O solution with ultrasonic radiation at room temperature for 1 h. Under vigorous stirring, NaOH solution was added drop by drop into the above ethanolic solution until the pH value was 10. The product was collected and repeatedly washed with ethanol and on drying at 60 ℃, the CeO2/CNT composites were obtained. Then, the as-prepared composites were heated at 450 ℃ in an air atmosphere for 30 min to remove CNTs. The ceria nanotubes were characterized by X-Ray Diffraction （XRD）, Transmission Electron Microscopy （TEM）, and X-Ray Photoelectron Spectrum （XPS）. The results showed that the ceria nanotubes were polycrystalline face-centered cubic phase and were composed of lots of dense cefia nanoparficles. The diameter of cefia nanotubes was about 40-50 nm. Catalytic activity of the product for CO oxidation was carded out at the region of 30-300 ℃ in a U-shaped quartz reactor with feeding about 0.15 g of the catalyst, which was loaded on Al2O3 carder. The inlet gas composition was 1.0% CO and 28% O2 with N2 as balance, and the rate of flow was kept at 40 ml/min. The catalytic products were analyzed by gas chromatography. The as-repared CeO2 nanotubes showed higher CO oxidation activity, which indicated that the morphology of ceria products affected the catalytic performance. The ceria nanotubes supported on Al2O3 demonstrated that conversion temperature for CO oxidation to CO2 was lower than that for bulk catalysts.