基于LS-SVM棉针织物轧烘轧蒸染色工艺的预测模型

为优化活性染料对棉针织物的轧烘轧蒸染色工艺,基于最小二乘支持向量机(LS-SVM),以氯化钠质量浓度、碳酸钠质量浓度、烘干时间和汽蒸时间作为预测模型的输入变量,染色织物K/S值作为输出变量,建立了多因素模型并进行预测。结果表明,织物实验K/S值和模型预测值的相关系数高达0.99996,平均相对误差小于0.5%,说明该模型具有较高的精度,该建模方法可用于染色织物K/S值的预测,可以用于棉针织物轧烘轧蒸染色工艺的预测和优化。     

《电子显微分析》课程教学内容及方法研究

《电子显微分析》课程是目前高校材料类和生命科学类专业一门重要的专业选修课。根据《电子显微分析》课程特点，剖析了该课程的教学现状以及存在的问题。针对这些问题，在教学内容的设定、教学方式的调整及实践性教学的考核等方面做了一些思考。     

纯棉织物的醚化2D树脂成衣免烫整理

为探索醚化2D树脂对纯棉织物抗皱整理的可行性和最佳工艺设置,设计正交试验探究醚化2D树脂、催化剂、保护剂、柔软剂在成衣免烫技术中的应用工艺,确定最佳工艺为醚化2D树脂F-AP质量浓度150 g/L、催化剂FM质量浓度40 g/L、保护剂HDP质量浓度35 g/L、柔软剂NUP质量浓度15 g/L。应用SPSS统计分析软件对4种助剂对棉织物的抗皱整理效果做显著性检验,结果表明:相对另外3种助剂,醚化2D树脂对棉织物的抗皱整理效果影响最为显著。重点分析了醚化2D树脂对整理后织物性能的影响,发现醚化2D树脂质量浓度超过160 g/L时,棉纤维与树脂的反应呈现饱和,使棉织物折皱回复角和断裂强力变化趋缓,过多的树脂残留使纱线间的摩擦力增加,对织物抗撕破起负效果。     

Advanced Surface of Fibrous Activated Carbon Immobilized with FeO/TiO2 for Photocatalytic Evolution of Hydrogen under Visible Light

FeO-doped TiO₂ nanoparticle photocatalysts were immobilized onto the surface of fibrous activated carbon (ACF) via a sol-gel process. As an adsorbent and photocatalyst, FeO-TiO₂ on immobilized ACFs (FeO-TiO₂/ACF) greatly improved the photocatalysis rate of hydrogen production as compared with pure TiO₂ and ACF-TiO₂ under UV irradiation and visible light. The addition of ACFs surface significantly reduced the photogenerated pairs of electrons-hole recombination, thereby promoting the photocatalysis action of doped photo-metal oxides of FeO-TiO₂. Co-doping of FeO onto the lattice of the TiO₂ approach can improve the absorption activity of visible light through photo-metal oxide of TiO₂ and further enhance hydrogen production under visible light. The photocatalytic fabrics (FeO-TiO₂/ACF) were effortlessly split out from the experimental solution for re-utilization and exhibited high stability even after five complete regeneration cycles.     

纳米微晶功能性莫代尔/羊绒/舒弹丝混纺纱开发

针对目前市场中的功能性整理剂多是通过对织物表面涂层进行功能附入,织物经水洗后功能会明显减弱,且会出现手感不佳等问题,采用将粒径为5 nm左右的远红外抗菌功能晶体镶嵌到羊绒纤维鳞片结构层中的方法,使纤维具有永久性抗菌功能。采用功能性羊绒纤维、莫代尔及舒弹丝,通过精梳毛纺工艺系统与棉纺工艺系统相结合的方式纺制功能性莫代尔/羊绒/舒弹丝45/30/25混纺纱,并对纺纱设备的重要部件进行改造,较好地解决了混纺纱毛粒问题。测试结果表明:该混纺纱织物具有良好的抗起毛起球性能、保暖性及抗菌性能。     

Diffuse reflectance behavior of the printed cotton/nylon blend fabrics treated with zirconium and cerium dioxide and citric acid in near- and short-wave IR radiation spectral ranges

Near- and short-wave IR emission spectra of printed cotton/nylon blend fabrics coated with inorganic compounds in order to tune their diffuse reflectance behavior to the ones with woodland and desert backgrounds are investigated. In this regard, cotton/nylon blend fabrics printed with a four-color digital pattern were used as the substrate, and different concentrations of zirconium and cerium dioxide (ZrO₂ and CeO₂) with and without citric acid as a cross-linker were loaded on these fabrics using the pad-dry-cure method. The diffuse reflectance of the coated fabrics with various concentrations of nanoparticles and a cross-linker was first measured by near-infrared (NIR) diffuse reflectance spectroscopy (DRS). Then, fabrics with an optimum concentration of nanoparticles and appropriate reflectivity profiles similar to woodland and desert were investigated by field emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), washing, and rubbing fastness properties. In general, NIR and short-wave infrared (SWIR) reflectance of fabrics coated with ZrO₂ and CeO₂ nanoparticles in range of 1% to 1.5% (w/v [%]) was suitable for matching with different environments. According to the findings obtained from the durability test, it was concluded that the washing fastness of the treated fabrics with CeO₂ nanoparticles was excellent in both environments. FE-SEM images of the treated fabrics containing ZrO₂ and CeO₂ indicated that the presence of nanoparticles on the surface of fabrics in woodland patterns was greater than the desert ones. However, the coated fabrics with CeO₂ and citric acid in the woodland pattern have shown better dispersion with a mean particle size of 30 to 60 nm.     

莫代尔/涤纶针织用纱工艺设计的探讨

结合生产工艺实践,详细介绍了莫代尔/涤纶(质量比80/20)13 tex针织用纱的生产设计过程。首先对选用的莫代尔和涤纶两种纤维进行性能测试,根据纤维性能及混纺比例确定纺纱工艺流程,再通过计算各道工序半制品定量、牵伸倍数、机件转速等参数调整每道工序所选设备的工艺参数,并进行参数优化,最后测试莫代尔/涤纶混纺纱的性能。通过测试数据分析得出,混纺纱的品质性能明显优于纯纺纱的性能,为企业开发此类产品提供了有利的理论参考。     

Implementing flipped learning approach based on ‘first principles of instruction’ in mathematics courses

This study investigates the effect of E-learning (EL), blended learning (BL) and flipped learning (FL) approaches on the mathematics achievement, self-regulation and mathematics self-efficacy. Participants consist of 163 first-year students attending an associate degree program (a 2-year program) of a state university. The EL, BL and FL settings in the research were designed based on Merrill's ‘First Principles of Instruction Design Theory’. In the research in which a quasi-experimental pre-test–post-test research design was used, the data were obtained by means of mathematics achievement test, self-regulation and self-efficacy questionnaires. The experimental results showed that the mathematics achievement post-test scores of FL students were significantly higher than those of the students of EL and BL. No significant difference was found between BL and EL settings. In addition, FL students showed significantly higher self-regulation and mathematics self-efficacy than the other groups' students. According to these results, it can be said that the usage of FL approach in mathematics courses has a positive effect on the learning process of students. It is expected that the findings will be helpful in the future design and implementation of mathematics courses at vocational colleges.