阿魏酸衍生物对食用油脂抗氧化性能的研究

采用化学及生物催化的方法合成几种具有生理活性的阿魏酸衍生物。以过氧化值(POV)为指标研究不同阿魏酸衍生物对猪油及花生油的抗氧化性能。结果表明,阿魏酸衍生物对猪油和花生油都具有一定的抗氧化作用,在这些衍生物中阿魏酸双甘酯效果最好且存在剂量效应关系；添加了阿魏酸双甘酯的猪油和花生油在20℃条件下保存,其货架保存期分别可从114d延长至300d；81d延长至258d。     

切削加工中喷雾冷却的应用

喷雾冷却是利用一定压力的压缩空气使微量的切削液雾化,并高速喷向切削区,因而使切削区的切削温度大幅度下降,同时带走切屑和粉尘,改善作业环境,避免造成环境污染.从冷却原理及实际应用效果两方面都说明,喷雾冷却具有较好的切削区冷却作用和推广价值.     

Formation and recovery of Co,Ni, Cu macromolecular complexes with polystyrene and acrylic acid

The formation and structure of Co²⁺, Ni²⁺ and Cu²⁺ macromolecular complexes with a series of polystyrene and acrylic acid copolymers (PSt/AA) were studied. Both the copolymers and the metal complexes (M-PSt/AA) were characterized by FTIR, elemental analysis, Gel Permeation Chromatography and AAS. It is shown that the PSt/AA copolymer has rather strong coordination ability to the metal ions by chelation with the carboxylate group, and the microstructures of the M-PSt/AA complexes can be well controlled. Its adsorption behavior toward Co²⁺, Ni²⁺ or Cu²⁺ and various related parameters in the separation process were determined. The results indicate that the adsorption capability varies with pH and the maximum adsorption capacities were 337 mg/g for Co²⁺, 338 mg/g for Ni²⁺ and 341 mg/g for Cu²⁺ at around pH 7. Adsorption isotherms reveal that the adsorption process is consistent with the Freundlich equation. Experiments show that PSt/AA can recover Co²⁺, Ni²⁺ or Cu²⁺ with a high adsorption rate and high selectively coefficient from a simulated industry solution containing Ca²⁺ and Mg²⁺ as impurities. The resin can be readily stripped with acid and recycled for re-use after transformation to its sodium form.     

管沟污泥固结体重金属离子稳定性及路用性能研究

城市管沟污泥的最佳出路是无害化处理、资源化利用、产业化发展。本文研究了以上海市管沟污泥为原料，加入一定比例的固化剂和矿物掺合料使之固结，经养护。满足路用性能，测试其固结体重金属溶出量亦满足国家标准，即污泥中的重金属离子得到有效的束缚和稳定固化，既解决了环境问题，又为污泥产业化发展开辟了新的途径。     

浅谈数控机床维护与故障排除

数控机床是高精度自动化设备且价格昂贵，如何保持其长期可靠地运行，涉及到数控机床的维护保养和维修，为此，以提高数控机床使用寿命为目的，对数控机床共性的维护保养方法作一简述。     

Fabrication and characterization of novel hydroxyapatite/porous carbon composite scaffolds

Novel hydroxyapatite (HA)/porous carbon composite scaffolds were prepared by applying sonoelectrodeposition and a subsequent hydrothermal treatment to previous carbonized phenolic resin coated polyurethane sponges. The interconnected pore network and morphology of HA/porous carbon composite scaffolds were determined by scanning electron microscope (SEM), and the whole surface of porous carbons were evenly coated with the deposited HA layer which was confirmed by EDS and XRD. The porosity (83.5 ± 0.3%) and the bulk density (0.297 ± 0.009 g·cm⁻³) of HA/porous carbon scaffolds were detected by the Archimedes method. The compressive and flexural strength of the scaffolds is 1.187 ± 0.064 MPa and 0.607 ± 0.268 MPa, respectively. Compared with the polymeric surface of 24-well cell culture plates, these novel scaffolds significantly promote the proliferation of human osteoblast-like MG-63 cells, indicating that this novel HA/porous carbon composite scaffold could be used for in vitro 3D culture of osteoblasts.