摘要：The CuO/γ-Al2O3/cordierite catalyst, after being sulfated by sulfur dioxide (SO2) at 673 K, exhibits high activities for selective catalytic reduction (SCR) of nitrogen oxide (NO) with ammonia (NH3) at 573-723 K. The intrinsic kinetics of SCR of NO with NH3 over CuO/γ-Al2O3/cordierite catalyst has been measured in a fixed-bed reactor in the absence of internal and external diffusions. The experimental results show that the reaction rate can be quantified by a first-order expression with activation energy Eá of 94.01 kJ·mol-1 and the corresponding p re-exponential factor A′ of 3.39×108 cm3·g-1·s-1 when NH3 is excessive. However, when NH3 is not enough, an E ley-Rideal kinetic model based on experimental data is derived with Ea of 105.79 kJ·mol-1, the corresponding A of 2 .94×109 cm3·g-1·s-1, heat of adsorption-Hads of 87.90 kJ·mol-1 and the corresponding Aads of 9.24 cm3·mol-1. The intrinsic kinetic model obtained was incorporated in a 3D mathematical model of monolithic reactor, and the agreement of the prediction with experimental data indicates that the present kinetic model is adequate for the reac-tor design and engineering scale-up.

摘要：目前,腔镜下胆囊切除术作为一种微创手术已广泛应用于临床,部分内窥镜手术取物器在标本取出时存在不足,易使标本变换取出先后顺序和形状。此外,取物过程中若需延长切口时,因暴露不佳而需在盲视下操作,易致切口创伤加大,破坏取物装置,从而使标本“污染”切口[1]。

摘要：我国在农网配电自动化方面的研究与国外的研究比较明显滞后,这种状况既制约着配电网运行水平的提高,也影响着线路损耗的降低。而实用型系统便于建设,性价比高,效果显著,对于提升农网配电自动化程度和综合效益意义重大。对此,本文就实用型农网配电自动化系统设计与应用进行了探讨。