Authors:M. Zheng, L. Zhang, H. P. Teng, J. Hu, and M. L. Hu
In the present paper, CFD simulation is used to perform the numerical calculation of behaviours of multi-blade drag typed VAWT. The sliding grid technology, FLUENT software and PISO algorithm are involved. By taking wind power efficiency Cp as the goal function, the optimal situations of multi-blade drag typed VAWT with 4 and 6 blades are conducted by CFD simulation. In this investigation, the variable parameters include the rotation rate of wind-mill ω, the blade installation angle θ and the blade width d. The results show that: the optimal working conditions for the 4-blade wind mill at the inlet wind speed 8 m/s are ω = 18 r/ min, θ = 28°, and d = 0.83 m, which induces an optimal wind power efficiency rate Cp = 27.127%; the optimal working conditions for the 6-blade wind mill at the inlet wind speed 8 m/s are ω = 18 r/min, θ = 27°, and d = 0.67 m, which leads to an optimal wind power efficiency rate Cp = 30.404%.
Authors:L. Ilieva, G. Munteanu, P. Petrova, T. Tabakova, N. Velinov, and I. Mitov
. The established catalytic activities in both reactions were higher in comparison to those of gold catalyst with the same composition but using co-precipitation (CP) method for mixed support preparation. Qualitative comparison of the TPR profiles of
Authors:Viorel Chihaia, Karl Sohlberg, L. Ilieva, P. Petrova, T. Tabakova, R. Zanella, and Z. Kaszkur
In this article, we present a study of gold catalysts supported on two series of ceria supports doped with MeO x (Me = Fe, Mn, Co and Sn) prepared by co-precipitation (CP) and mechanochemical activation (MA). The structure of
, Kim K. M. ( 2010 ), Preliminary cost estimation model using case-based reasoning and genetic algorithms . Journal of Computing Civil Engineering , 24 ( 6 ), 499 – 505 . DOI: 10.1061/(ASCE)CP.1943
Authors:Attila Vámosi, Levente Czégé, and Imre Kocsis
, “ Comparison of driving cycles obtained by the Micro-trips, Markov-chains and MWD-CP methods ,” Int. J. Sustain. Energy Plann. Manage. , vol. 22 , pp. 109 – 120 , 2019 , https://doi.org/10.5278/ijsepm.2554 .
Authors:Alejandro López-Gaona, José De los Reyes, Julia Aguilar, and Nancy Martín
Pt/MCM, Pt/SiO2, Pd/MCM and Pd/SiO2 were prepared and characterized by H2-TPR, TEM, 29Si-CP-MAS-NMR, DRS-UV-Vis and tested in the hydrodechlorination of 1,2-dichloroethane. Differences in the catalytic behavior
were related with textural properties.
In this work, hydrogenation of sorbic acid to cis-hex-3-enoic acid using homogeneous Ru catalyst [Cp*Ru(sorbic acid)]Tf (Tf = CF3SO3−) immobilized to smectite materials by means of ion exchange has been studied. The immobilized catalyst was utilized for heterogeneous
hydrogenation of sorbic acid to the desired cis-hex-3-enoic acid, achieving the selectivity of up to 95% and the possibility of the catalyst to be reused.
Two mesoporous silicas (HMS) with high surface area and a pore diameter size of 2 nm were synthesized by a sol–gel method.
Platinum catalysts were prepared with a 1 wt% metal content. A commercial silica supported catalyst was used for comparison.
The catalysts were characterized by H2-TPR, TEM and 29Si-CP-MAS-NMR. The catalytic activity was measured by the hydrodechlorination of 1,2-dichloroethane. The enhanced activity
of the mesoporous catalysts was related to the platinum particle size.