φ1150初轧机主传动系统扭振研究

在现场综合测试的基础上，分析了采用可控硅供电的１１５０初轧机主传动系统的扭振状况。应用作者建立的有阻尼原坐标分析法，对主传动系统的扭矩响应波形进行仿真，结果与实测波形一致。这为轧钢机主传动动态计算提供了一种新的方法。     

Investigating metal-binding in proteins by nuclear magnetic resonance

Metal ions play a key role for the function of many proteins. The interaction of the metal ion with the protein and its involvement in the function of the protein vary widely. In some proteins, the metal ion is bound tightly to the ligand residues and may be the key player in the function of the protein, as in the case of blue copper proteins. In other proteins, the metal ion is bound only temporarily and loosely to the protein, as in the case of some metalloenzymes and other proteins where the metal ion acts as a cofactor necessary for the function of the protein. Such proteins are often known as metal ion-activated proteins. The review focuses on recent nuclear magnetic resonance (NMR) studies of a series of metal-dependent proteins and the characterization of the metal-binding sites. In particular, we focus on NMR techniques for studying metal binding to proteins such as chemical shift mapping, paramagnetic NMR and changes in backbone dynamics upon metal binding. Received 12 October 2006; received after revision 30 November 2006; accepted 5 February 2007