综述了催化还原法消除氮氧化物研究现状、发展趋势及反应机理，特别是对烃类选择性催化还原氮氧化物过程进行了说明。
The catalytic reduction of NO_x was reviewed with the emphasis on the progress of studies, developing trend and the reaction mechanisms of the selective reduction of NO_x with hydrocarbons.
利用多重分形消除趋势分析法(MF - DFA)对纽约原油期货日收益率时间序列进行分析，发现纽约原油期货市场具有明显的多重分形特征。
The return series of New York oil futures market is analyzed based on multifractal detrended fluctuation analysis (MF-DFA) method, through which the obvious multifractal behavior has been found.
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