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250 results on '"Zhang, C.X."'

9. Practicing Education of the Mineral Processing Engineering Discipline in Henan Polytechnic University

Author

Cheng, G., Zhang, C.X, Fan, Y.C, Li, F.F, Lin, L., and Zhu, X.B

Abstract

A plan for national education to train outstanding engineers has been put into practice at Henan Polytechnic University (HPU). Practical education is a basic characteristic of engineering education. This paper proposed ideas and models to reform the mineral processing engineering education system and also described the discipline and the objective of cultivating students for careers in mineral processing engineering. On the basis of a survey and analysis of the quality of graduate student cultivation, we established a practical teaching system of 'four levels, seven categories' and the effect of this system was initially apparent.

Published
2019
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36. Computational study of the effects of shock waves on film cooling effectiveness

Author

Zhang, C.X.-Z. and Hassan, I.

Subjects
Aerofoils -- Heating, cooling and ventilation, Numerical analysis -- Methods, Shock waves -- Influence, Engineering and manufacturing industries, Science and technology
Abstract

The performance of a louver cooling scheme on a transonic airfoil has been studied numerically in this paper. Film cooling holes are located near the passage throat. The Mach number at the location of the jet exit is close to unity. A comparison of film cooling effectiveness between numerical prediction and experimental data for a circular hole shows that the numerical procedures are adequate. In addition to the shock-wave effects and compressibility, curvature effect was also studied by comparing cooling effectiveness on the airfoil surface with that on a flat plate. Substantially higher cooling effectiveness for the louver cooling scheme on the airfoil was predicted at blowing ratios below 1 in comparison to other cooling configurations. At higher blowing ratios than 2 the advantages of the louver cooling scheme become less obvious. It was also found that for the same cooling configuration the cooling effectiveness on the transonic airfoil is slightly higher than that on a flat plate at moderately low blowing ratios below 1. At high blowing ratios above 2 when the oblique shock becomes detached from the leading edge of the hole exits, dramatic reduction in cooling effectiveness occurs as a result of boundary layer separation due to the strong shock waves. A coolant-blockage and shaped-wedge similarity was proposed and found to be able to qualitatively explain this phenomenon satisfactorily. [DOI: 10.1115/1.3026568] Keywords: film cooling, louver cooling scheme, shaped holes, transonic airfoil, shockwave reflection, flow past a wedge, CFD, gas turbines

Published
2009

46. Integration of mixed-cropping and rice-duck co-culture has advantage on alleviating the nonpoint source pollution from rice (Oryza sativa l.) production

Author

Li, M.J., Li, R.H., Zhang, J.E., Guo, J., Zhang, C.X., Liu, S.W., Hei, Z.W., Qiu, S.Q., Li, M.J., Li, R.H., Zhang, J.E., Guo, J., Zhang, C.X., Liu, S.W., Hei, Z.W., and Qiu, S.Q.

Abstract

With the rapid development of agricultural industrialization, agricultural nonpoint source pollution, which occurs when synthetic chemical additives (e.g. fertilizer, pesticides, and herbicides) runoff into rivers or lakes, has become a major concern. To explore the approaches of reducing the application of chemical additives, we conducted a field experiment to test whether the integrated farming systems would alleviate the nonpoint source pollution. Specifically, we tested whether mixed-cropping or mixed-cropping plus duck co-culture (MCDC) systems with optimized rice (Oryza sativa L.) cultivars could reduce nutrients runoff or leaching from paddy field. We found that compared to the mono-cropping systems, the electrical conductance (EC), oxidation-reduction potential (ORP), the contents of dissolved oxygen (DO), nitrates (NO3 -), ammonium (NH4 +), total nitrogen (TN), total phosphorus (TP) and total potassium (TK) of paddy water in MCDC systems all increased during the rice-growing stages. The contents of the TN, TP, and TK of paddy water in MCDC systems were 45.35%, 52.43% and 40.47% higher than those in the mono-cropping systems, respectively. Compared to the conventional mono-cropping, the mixed-cropping systems could alleviate nonpoint source pollution by decreasing the application of synthetic chemicals to rice paddies, the rice-duck co-culture system had significantly lower additions of agro-chemicals to paddy fields, which decreased the loss/runoff/leaching rates of nitrogen, phosphorus and potassium from paddy fields into the surrounding water areas by 32.73%, 8.72% and 31.88%, respectively. Considering that the MCDC systems exerted similar/even better performances as/than the rice-duck co-culture system and the rice mixed-cropping system, we deduced that the MCDC systems could also could alleviate nonpoint source pollution to a certain extent.

Published
2020

48. A new mango cultivar ‘Yunre-5007’

Author

Long, Y.Y., primary, Zhang, S.Y., additional, Xie, D.H., additional, Zhao, Z.H., additional, Chen, Y.F., additional, Zhang, C.X., additional, Zhang, F.M., additional, Luo, X.P., additional, and Ni, Z.G., additional

Published
2019
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