Comprehensive evaluation of majors offered by universities based on combination weighting.

This paper proposes a combination weighting calculation method to evaluate the performance of majors. Because of the varying emphasis of each weighting method, a combination of the Criteria Importance Through the Intercriteria Correlation (CRITIC) method, entropy method, and mean-variance analysis is proposed. Based on the evaluation index system for engineering majors offered at universities, the research of index weight determination and major evaluation is carried out after investigating the data of various indices of engineering majors in recent years. Compared with the majors in engineering education accreditation, the results reveal that the major comprehensive performance ranking is valid, thereby not only providing a new program for universities to establish an evaluation mechanism but also implementing normalized and dynamic major evaluation.

An effective recycle way of waste coke ash and coking wastewater for preparing coke ash coking wastewater slurry.

The carbon riched coke ash (CA) and organic components riched coking wastewater (CW) recovered from coking plants wastes were utilized for the preparation of coke ash coking wastewater slurry (CACWS), aiming for the fuel and waste reduction and recovery. The effects induced by the properties of CA and compositions of CW on the performances of CACWS, such as slurryability, rheology, stability and dispersant adsorption were investigated and discussed. Characterizations like zeta potentials and contact angles on the surface of CA were also conducted to draw a comprehensive formation mechanism of CACWS. Results showed that the CA was suitable for preparing slurry due to the lack of micropore structures and hydrophobicity in the surface. The maximum content of CA in the as-prepared CACWS could reach 66% and CACWS exhibited non-Newtonian pseudoplastic fluid behaviour. By reducing the particle size distribution, the slurryability of CA could be effectively improved. Although the components in CW enhance the wettability of CA surface, compared with cations in CW, the organic components had more influence on CACWS, which also obviously increased the viscosity of CACWS. The maximum CA content in CACWS (ω = 66 wt%) reduced by 9% comparing to CA water slurry (ω = 75 wt%) which improved the storage stability about 10%. In addition, results show that the dispersant Triton X-405 reduced viscosity and improved stability while in comparison with the anionic polycarboxylate dispersant. Overall, this study may provide an innovative and effective utilization of CA and CW from the coke plants wastes.