The preparation of nanomaterials and the research and application of bismuth based nanomaterial series in the field of lubrication were summarized,and the development about the bismuth based materials as additive in the field of tribology was introduced.
Based on the B3LYP density functional theory,the LANL2DZ basis set was employed to study the equilibrium geometries and vibration frequencies of two kinds of the isomers C50 with D5h/D3 symmetry and the clathrate M@C50[M=Be,Mg,Ca,Sr,Ba] as the 2nd main group formed with the isomers as radicals.
Polyurethane foam (PUF) based on the prepared biomass polyol had good mechanical property, such as apparent density of 15.0kg/m2, tensile-strength of 80kPa and resilience rate of 30%. In addition, the foam had good biodegradability.
The third chapter mainly introduces a feedback harmonic detection method,which is based on frequency analysis of IRP (Instantaneous Reactive Power北京工业大学工学博士学位论文Theory) The design method and DSP realization to this method is proposed.
The graphitization degree of C/C composites was characterized by XRD, Raman spectroscopy and TEM respectively, based on which, the quantitative relationship between XRD parameter g and Raman parameter R-1 has been founded for the first time and successfully used in local analyses of the graphitization degree.
Because of the complexity of the stress distributionin the repaired structure, based on the residual strength degradation model the author introduce into thelocal stress-strain method to set up the fatigue life prediction model for the composite repaired structure.