挤压油膜阻尼器转子系统非线性动力特性分析

为了对挤压油膜阻尼器（SFD）-转子系统非线性动力特性进行分析，提出了油膜力数据库方法，即将挤压油膜阻尼器轴颈沿径向和周向的速度变化范围从（-∞, ∞）转化到（-1, 1)，给定阻尼器的长径比，用有限差分法建立了挤压油膜阻尼器轴颈在各离散运动状态下的油膜力数据库，直接或通过插值求得对应运动状态下的非线性油膜力，从而有效地解决了非线性油膜力的快速计算问题。实际算例计算结果表明，该方法无论在速度还是在精度上都能满足要求，对实际转子系统的动力特性分析及优化设计具有一定的应用价值。     

Constraints on injection parameters of cosmic rays in the Galactic center from resolved HESS observations

In this study, we investigate how restrictive the γ-ray emission from the Galactic center region, as seen by HESS and other Cherenkov air shower arrays, is against various models for cosmic ray injection. We derive diffusion coefficients which fit the observed spatial scales of diffuse γ-ray emission from the extended emission associated with the molecular clouds SgrA, B and C. Using these diffusion coefficients, we then obtain a limit for time scale of assumed recent proton acceleration near the SMBH, as the spatial size of SgrA^∗ in VHE γ-rays has to be consistent with the observed unresolved HESS point source size at this position. The signal from this hadronic component may be mixed with the expected VHE inverse Compton emission from the nearby unresolved pulsar wind nebula.     

Energetic particle measurements onboard Spectr-R with MEP-2

The energetic particle experiment MEP-2 onboard the Spectr-R high apogee satellite is briefly described. The instrument measures fluxes and spectra of electrons (30 keV–350 keV) and ions (30 keV–3.2MeV), using two pairs of silicon detectors. The example of first observations upstream from the bow shock illustrates its successful operation in space. Unique observations of ～30 s strong fluctuations of energetic ions with energies up to two hundred keV are discussed.     

The discovery of ETI as a high-consequence,low-probability event

The authors use the opportunity of presenting a paper during the 51st International Astronautical Congress in Rio de Janeiro to introduce a numerical method of characterizing the potential significance of any announcement of discovery of extraterrestrial intelligence. This approach uses the Torino Scale (for characterizing asteroid impacts) as a model for constructing a proposed “Rio Scale” to assist the discussion and interpretation of any claimed discovery of ETI.     

Comprehensive investigation of the basic parameters of the upper atmosphere at the time of the flight of the geophysical rocket “vertical-6”

Ion temperature and total ion concentration measured on 25th October 1977 during the flight of the geophysical rocket “Vertical-6” are analyzed. The solar EUV fluxes determined in five wave-length bands with a photoelectron analyzer are also given. The observed anomalous variation of ion temperature between 700 and 900 km and the measured ion concentration can be explained, if the charge exchange reactions H⁺ ? O⁺ and diffusion are taken into account.     

On the origin of the grooves on Phobos

L-grooves are the consequence of layered structure of Phobos, which are made up of parallel layers of different composition or hardness.