In this article, we consider, based on the super-diamagnetic model, the new problems of Saturn’s rings discovered by Cassini, such as: 1) anomalous purity of water ice;2) Saturn’s magnetic field alignment with the p...In this article, we consider, based on the super-diamagnetic model, the new problems of Saturn’s rings discovered by Cassini, such as: 1) anomalous purity of water ice;2) Saturn’s magnetic field alignment with the planet’s rotation axis;3) “ring rain” of the submicron particles;4) the deviation in the qualitative composition of the “rain” from the composition of the rings;5) “dirt” concentrated in the ring gaps;6) “plateaus” in Saturn’s C ring;7) age of the rings;8) roll-off in the spectrum of Saturn’s rings, and 9) “propellers” in Saturn’s A ring. Interpretation of Cassini’s observations of spectral roll-off in Saturn’s rings in the wavelength range from 100 micrometers to 0.5 mm is given. It was concluded that the substance of the rings could be in the superconducting state. An explanation of the Cassini spectral data is given using the hypothesis of the existence of a superconducting energy gap in the substance of rings.展开更多
A novel compact electromagnetic bandgap （EBG） structure constructed by etching two reverse split rings （RSRs） and inserting interleaving edge （IE） on the patch of conventional mushroom-like EBG （CML-EBG） is in...A novel compact electromagnetic bandgap （EBG） structure constructed by etching two reverse split rings （RSRs） and inserting interleaving edge （IE） on the patch of conventional mushroom-like EBG （CML-EBG） is investigated. Simulated dispersion diagrams show that the proposed EBG structure presents a 13.6% size reduction in the center frequency of the bandgap. Two comparisons have been carried out for the analysis of the effect of the RSRs and IE configuration. Then, a sample of this novel EBG is fabricated and tested, further experimental data agree well with the simulated results. Thus, this EBG structure makes a good candidate to decrease mutual coupling in compact microstrip patch array.展开更多
针对某电厂一台300 M W发电机滑环轴运行中出现的不稳定振动问题,对机组开展了现场振动测试。通过对测试所得振动数据、谱图和传感器间隙电压进行详细分析,发现基频是引起不稳定振动的主振频率和使传感器的间隙电压明显增大的原因。依...针对某电厂一台300 M W发电机滑环轴运行中出现的不稳定振动问题,对机组开展了现场振动测试。通过对测试所得振动数据、谱图和传感器间隙电压进行详细分析,发现基频是引起不稳定振动的主振频率和使传感器的间隙电压明显增大的原因。依据振动特征,诊断出造成发电机滑环轴不稳定振动是由于滑环轴支撑轴承(7号轴承)下瓦垫铁松动,引起的轴承油膜刚度降低。对下瓦垫铁进行加固后,滑环轴不稳定振动的问题得以解决。展开更多
文摘In this article, we consider, based on the super-diamagnetic model, the new problems of Saturn’s rings discovered by Cassini, such as: 1) anomalous purity of water ice;2) Saturn’s magnetic field alignment with the planet’s rotation axis;3) “ring rain” of the submicron particles;4) the deviation in the qualitative composition of the “rain” from the composition of the rings;5) “dirt” concentrated in the ring gaps;6) “plateaus” in Saturn’s C ring;7) age of the rings;8) roll-off in the spectrum of Saturn’s rings, and 9) “propellers” in Saturn’s A ring. Interpretation of Cassini’s observations of spectral roll-off in Saturn’s rings in the wavelength range from 100 micrometers to 0.5 mm is given. It was concluded that the substance of the rings could be in the superconducting state. An explanation of the Cassini spectral data is given using the hypothesis of the existence of a superconducting energy gap in the substance of rings.
文摘A novel compact electromagnetic bandgap （EBG） structure constructed by etching two reverse split rings （RSRs） and inserting interleaving edge （IE） on the patch of conventional mushroom-like EBG （CML-EBG） is investigated. Simulated dispersion diagrams show that the proposed EBG structure presents a 13.6% size reduction in the center frequency of the bandgap. Two comparisons have been carried out for the analysis of the effect of the RSRs and IE configuration. Then, a sample of this novel EBG is fabricated and tested, further experimental data agree well with the simulated results. Thus, this EBG structure makes a good candidate to decrease mutual coupling in compact microstrip patch array.
文摘针对某电厂一台300 M W发电机滑环轴运行中出现的不稳定振动问题,对机组开展了现场振动测试。通过对测试所得振动数据、谱图和传感器间隙电压进行详细分析,发现基频是引起不稳定振动的主振频率和使传感器的间隙电压明显增大的原因。依据振动特征,诊断出造成发电机滑环轴不稳定振动是由于滑环轴支撑轴承(7号轴承)下瓦垫铁松动,引起的轴承油膜刚度降低。对下瓦垫铁进行加固后,滑环轴不稳定振动的问题得以解决。
