No abstract

No abstract

No abstract

Here, we report a graphene oxide-wrapped coreshell structured carbon sphere@Al 2 O 3 composite (CS@Al 2 O 3 @GO) as the electrode material for sensitive determination of butylated hydroxyanisole (BHA). The coreshell structured CS@Al 2 O 3 was synthesized through a solution-based approach by using glucose and metal salts as precursors via a simple one-pot hydrothermal synthesis. Then, the CS@Al 2 O 3 was amino-functionalized and wrapped by conductive graphene oxide (GO) sheets through the electrostatic interaction. As a result, the CS@Al 2 O 3 @GO endowed the modified electrode fast electron transfer rate and high electrocatalytic activity toward BHA oxidation. Under the optimal conditions, the oxidation current increased linearly with the concentration of BHA in the range of 0.2~200 μM with the detection limit and quantification limit of 41 and 136.7 nM using differential pulse voltammetry. The presented method was also demonstrated for the determination of BHA in food samples with satisfactory results.

Color is the external manifestation of ethnic minority culture, and the costume of each ethnic group has its objective color matching rules. In the color design of minority costumes, there is often a lack of scientific evaluation methods. Aiming at this problem, this article proposed a comprehensive evaluation method, based on the K-Means clustering method, for evaluating color matching schemes of minority costumes. We used the K-Means clustering method to analyze the objective laws of minority costume colors, and based on the objective laws found, we extracted the objective evaluation indicators. With the AHP (analytic hierarchy process) method, the judgment matrix was established to obtain the relative weights of each cultural image and objective evaluation indicator. Based on the trapezoidal fuzzy number, the user’s evaluation value of the cultural image index was clarified. The GRA-TOPSIS evaluation method was introduced to rank the color matching schemes of minority costumes. Taking the evaluation of the color matching scheme of Yi costumes as an example, this article confirmed that the proposed comprehensive evaluation method can effectively screen out the color matching schemes with the characteristics of minority costumes and can rank the color schemes to be evaluated according to their relative similarity degree to the color characteristics of minority costumes. The method integrated subjective and objective evaluations, overcame the problem of contradictory results of subjective and objective evaluations, and achieved a certain degree of symmetry between the objectivity of the color laws of minority costumes and the subjectivity of the cultural image of minority costumes. In addition, we also found the possibility of using K-Means clustering to extract the main color features of minority costumes to improve the design of color schemes.