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Fabrication of Co/Al2O3 Composite Nanofiber via Electrospinning with Tunable Magnetic Properties
Zidong Zhang,Wenjin Zhang,Min Chen,Yuliang Jiang,Rui Tian,Jian Zhang,Runhua Fan 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11
In this paper, Co/Al2O3 composite nanofibers with different Co content are fabricated by electrospinning combinedwith selective reduction. By controlling the Co content in the composite nanofiber, not only the fiber’s morphology, but alsothe magnetic properties can be well adjusted to meet different applications’ requirements. The magnetic hysteresis loops ofcomposite nanofiber show two different types of shape, typical ferromagnetism and wasp-waisted ferromagnetism. Interestingly, the saturation magnetization, which has a close relationship with the content of magnetic component, is notsimply shows an increasing tendency with the increases of Co content in the composite fiber. For the Co content below50 wt%, the Ms value increases with the Co content. After that, the saturation magnetization decreases to a valley value atnear 60 wt% Co content, then increases again. The coercivity also shows the same tendency. The results indicate that thedipolar coupling interaction plays a key role in the magnetic property adjustment of Co/Al2O3 composite nanofiber.
Evaluation of design innovation using the length-time dimension and regression analysis
Kang Wang,Runhua Tan,Qingjin Peng,Lulu Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.11
Although importance of innovation has been widely recognized, there is a lack of the effective method to evaluate the design innovation. Most of the existing methods for innovation evaluations are based on the qualitative analysis and domain experts. As the lack of objective indicators and rules, evaluation results from different designers are easy to differ. In order to reduce obstacles of the innovative design, this paper proposes a quantitative method to evaluate the innovation of conceptual schemes. From the perspective of product physical attributes, length-time dimensions are formed to represent the scheme type and innovation level. The degree of technical differences between existing products and new solutions is assigned as a measurable independent variable. Using a multiple regression model, sufficient case data are analyzed to obtain the evaluation formula with the statistical and engineering significance. The proposed method is applied to evaluate design of a series of practical products. Design of a tire breaker for the traffic control illustrates the method in detail, which proves the method potential to guide designers for searching innovative solutions.