Adsorption of a single polymer chain on a surface: A molecular dynamics simulation study

We performed simulations of the physical adsorption of a single globular chain on a surface of hemispherical shape by means of molecular dynamics simulations. For the chain, we took advantage of a united atom model. Interactions within the chain were limited to stretching, bending, and torsional as well as nonbonded interactions between the nonadjacent atoms. The interaction between each chain element and the surface formation are reigned by a Lennard–Jones potential. In this article, we focused on differences in the behavior of the adsorbed globule to the free unadsorbed one particularly in two different zones of the immediate vicinity of the surface. There were strong indications for a localized acceleration of the dynamics as compared with the bulk that appears in an increase of trans–gauche switches. For explanation we came up with an adsorption scenario. Special attention was given to the shift of the percentage of trans and gauche conformations within the globule in dependence on the strength of the adsorption potential that might be related to crystallization or glass transition. © 2001 John Wiley & Sons, Inc. J Polym Sci Part B: Polym Phys 39: 2333–2339, 2001     

单力矩器大角速率动调陀螺仪力矩再平衡回路的分析与综合

针对仅有一个力矩器的大角速率动调陀螺仪,力矩器线圈必须通以与陀螺仪自转角速率同频率变化的交变电流的特点,分析了采用合成施矩方式的力矩再平衡回路的工作原理。根据系统要求,对放大校正环节进行了设计。通过系统仿真及实例,验证了仿真模型的可信性及设计的合理性。     

一种赤道刻线静电陀螺仪主动阻尼控制方案及其实验研究

提出一种采用转子赤道刻线，利用赤道光电传感器的输出来控制阻尼力矩方向的半球施矩主动阻尼控制方案。在气浮装置上用大球转子进行了模拟试验。试验表明该主动阻尼控制方案可在大范围内对转子进行阻尼，大大减少了阻尼时间。中对大球转子及实心转子主动阻尼结果进行了对比分析，表明对于实心转子ESG，赤道刻线主动阻尼方案能将阻尼时间减少到被动阻尼的10％。