Journal of Liaoning Petrochemical University
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Influence of MnDoping on the Structural and Electrical Properties of B i 2S r 2C a C u 2O8+ δ Compounds
Zhang Ying, Tang Yupeng
Abstract352)      PDF (1725KB)(258)      
The B i 2S r 2C a( C u 1-xMn x) 2O8+δ( x=0、 0. 0 1、 0. 0 2、 0. 0 3)  polycrystalline powders were synthesized by Pechini type solgel method. The changes in structure and electrical properties of B i 2S r 2C a C u 2O8+( abbrev. Bi2212) after Mn doping were investigated. Xray diffraction (XRD) and Fourier Transform Infrared (FT-IR) were employed to investigate the structural change of the samples. Conventional fourprobe method was used to study the electrical properties of samples. The results show that no secondphase diffraction peaks were detected except Bi2212 peaks. The lattice parameters of Bi2212 crystalline were changing with different Mn doping concentration. And the superconducting transition temperature of Bi2212 phase was decreased by about 11 K due to the Mn element introduction into Bi2212 lattice. 
2015, 35 (5): 10-13. DOI: 10.3969/j.issn.1672-6952.2015.05.003
Simulation and Analysis on Typical Rotor Fault Based on DASP
TANG Yu, SHI Chengjiang, YANG Jing, CUI Qing
Abstract477)      PDF (4664KB)(486)      
Based on the flexible rotor testbed as the research object, used DASPv10 analysis software to simulate the rotor imbalance and misalignment of two typical faults, the mechanism analysis were made for the collected signal from the eddy current sensor and the piezoelectric acceleration sensor. The experiments gave the timedomain analysis, frequencydomain analysis and axis path diagram in the case of normal and fault two cases,compared the experimental results with the theoretical analysis. It verified the two typical fault identification features of rotor vibration, making a better understanding of the fault mechanism and fault diagnosis of the rotating machinery system. 
2013, 33 (2): 80-84.