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开展教育科学研究的目的,一方面在于探索教育教学工作的规律,丰富并发展教育理论体系;另一方面也是更重要的方面,在于运用规律指导实践,推动教育教学工作不断向前发展. 相似文献
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我系检测与故障诊断室由VXI及PXI总线虚拟仪器，IPC总线数据采集卡及工控机系统，网络设备，专用测试设备，各种软件构成，课题组还开发了测试引擎和故障诊断引擎，使之适用于多个层次学员的实验教学，并为科研提供了开放式环境和手段。 相似文献
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A variety of barium sulfate （BaSO4） carriers with or without mesopore structure were synthesized via precipitation reaction in aqueous solution of barium hydroxide and sulfuric acid with ethylene glycol as a modifying agent, and then calcined at various temperatures. The obtained BaSO4 was used as catalyst carriers for polystyrene （PS） hydrogenation, and BaSO4 supported palladium （Pd） catalysts with Pd content of 5wt% were prepared by using impregnation method. N2 physisorption, transmission electron microscopy, X-ray diffraction and kinetics studies were used to investigate the effect of carrier structure on the dispersion and geometric location of active metal and their catalytic activities in PS hydrogenation. It was found that the pore structure of carrier played an important role in the dispersion and location of Pd grains. The activation energy values for all the Pd/BaSO4 catalysts were around 49.1 kJ/mol, while the pre-exponential factor for Pd/BSC-6H was much higher than others. The Pd/BSC-6H without mesopores had Pd grains deposited on the external surface of the carrier, and exhibited better activity than the mesoporous catalysts. It is indicated that the utilization of Pd/BSC-6H can reduce the pore diffusion of PS coils and enabled more active sites to participate in the PS hydrogenation. 相似文献
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课文《海滨小城》中有这样一段话:“小城里每一个庭院都栽了很多树。有桉树、椰子树、橄榄树、凤凰树,还有别的许多亚热带树木。初夏,桉树叶子散发出来的香味,飘得满街满院都是。凤凰树开了花,开得那么热闹,小城好像笼罩在一片片红云中。” 相似文献
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