The results indicate that acid and alkali catalysts can increase the tar cracking reaction speed and reduce the activation energy due to the activated center.

结果表明，酸性和碱性催化剂由于活性中心的存在，加快了反应速度和降低了反应活化能。

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The mechanism of the activated center of the catalysts on the tar removal efficiency, the gas component after tar cracking and the reaction speed or activation energy were studied.

根据三种材料作用机理的不同，研究探讨催化剂活性中心对热解气中焦油裂解率、催化裂解气体成分及反应速度(活化能)的影响。

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Brain imaging showed that, on touching the paper, the emotional center of the brain was activated, thus forming a stronger bond.

大脑成像显示，接触纸张时，大脑的情感中心被激活，从而形成更强的联系。

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Last weekend GE activated a command center in Wilmington, N.

WSJ: GE Steps Up Aid in Reactor Crisis

Missouri Gov. Jay Nixon declared a state of emergency Thursday morning and activated the State Emergency Operations Center.

NPR: Winter Storm Blankets Great Plains With Snow

The state Emergency Operations Center in Albany was activated at noon Friday to monitor storm response.

WSJ: A state-by-state look at the Northeast blizzard