BAX: a dedicated X-rays galaxy clusters database

We present BAX, Base de Données amas de galaxies X (http://webast.ast.obs-mip.fr/bax), a project aiming at building a comprehensive database dedicated to X-rays clusters of galaxies allowing detailed information retrieval. BAX provides the user with basic data published in the literature on X-rays clusters of galaxies as well as with information concerning the physical properties in the X-rays domain or at other wavelengths. BAX allows individual studies on selected clusters as well as building up homogenous samples, from known X-rays clusters for which selection criteria are chosen through web interfaces. We expect BAX to become a useful tool for astronomy community in order to optimize the cluster science return using data from both ground based facilities like MEGACAM (CFHT), VIRMOS (VLT) and space missions like XMM, Chandra and Planck.     

重复热处理工艺对30CrMnSiA钢疲劳性能的影响

本文介绍了30CrMnSiA钢的九种不同的重复热处理工艺，结果显示B种热处理工艺能使30CrMnsiA钢具有最佳的抗疲劳性能并证明不同的重复热处理状态对钢的疲劳性能有影响。     

Fluid instabilities around accreting X-ray sources

Some aspects of fluid instabilities occurring in the magnetospheres of accreting neutron stars are discussed. It is pointed out that (i) in the absence of strong differential rotation, the accreting plasma should be drawn out into spiralling, sheet-like structures, resulting in efficient mixing between the two media; (ii) the Rayleigh-Taylor instability also acts to limit the X-ray luminosity in super-critical sources; and (iii) magnetic shear has a strong stabilizing influence on Kelvin-Helmholtz modes, and its presence may allow substantial amounts of material to be supported around the magnetosphere.     

Ultraviolet images of galaxies from the Optical Monitor on XMM-Newton

A large number of galaxies, both normal and active, have been observed in ultraviolet light by the Optical Monitor on XMM-Newton. These are some of the deepest wide-field ultraviolet images of these galaxies yet obtained, and in many cases the first collected in this waveband. We present images of five active galaxies, and discuss the potential uses of the ultraviolet surface brightness distribution and morphology, in association with X-ray data, for Active Galactic Nuclei, star formation and galaxy evolution studies.     

Evaluation of airborne data link communication

An experimental prototype of a cockpit data link communication interface (modified Navigation Display (ND) and Multi-purpose Control and Display Unit (MCDU)) was developed and tested in an Airbus A340 Full Flight Simulator. 8 crews (16 professional pilots) performed simulator flights in a mixed voice and data link scenario. After each experiment video recordings were presented to the pilots and they were asked to estimate subjective strain (NASA task load index) and situational aspects retrospectively. Results show an increase in subjective strain and a decrease of ‘feeling of sovereignty’ and situation awareness under data link conditions. The effect is similar to the one caused by higher workload.     

航空发动机寿命延长控制综述

传统航空发动机控制系统设计,只关注发动机性能,而寿命延长控制(Life Extending Control,LEC)将发动机寿命纳入到发动机控制系统设计要求中,以期在控制系统中解决寿命问题.在总结国外相关文献的基础上,简要回顾了航空发动机寿命延长控制的研究背景和价值;详细阐述了发动机寿命延长控制实现策略及其关键技术;并对航空发动机寿命延长控制结构进行介绍,提出多级延寿控制系统结构以解决控制器冲突问题;结合国内状况,针对发动机寿命延长控制技术给出一些建议.     

The case for massive,evolving winds in black hole X-ray binaries

In the last decade, high-resolution X-ray spectroscopy has revolutionized our understanding of the role of accretion disk winds in black hole X-ray binaries. Here I present a brief review of the state of wind studies in black hole X-ray binaries, focusing on recent arguments that disk winds are not only extremely massive, but also highly variable. I show how new and archival observations at high timing and spectral resolution continue to highlight the intricate links between the inner accretion flow, relativistic jets, and accretion disk winds. Finally, I discuss methods to infer the driving mechanisms of observed disk winds and their implications for connections between mass accretion and ejection processes.     

推进剂贮箱锥柱形金属膜片的翻转特性研究

基于MSC.Marc非线性有限元软件,对推进剂贮箱锥柱形金属膜片的变形进行仿真研究。模拟了膜片的翻转变形过程,分析了膜片翻转变形规律和失效因素,提出了膜片有效稳定翻转的条件。