Grain orientation effects on delamination during fatigue of a sensitized Al–Mg alloy

Fatigue crack growth experiments were conducted in humid air (RH~45%) at 25 °C on 29-mm-thick plate samples of an aluminium–magnesium (Al–Mg) 5083-H131 alloy in the long transverse (LT) direction. Samples were tested in both the as-received condition and after sensitization at 175 °C for 100 h. Delamination along some grain boundaries was observed in the short transverse plane after fatigue testing of the sensitized material, depending upon the level of ΔK and K_max. Orientation microscopy using electron backscattering diffraction and chemical analyses using transmission electron microscopy and energy dispersive spectroscopy of grain boundaries revealed that Mg segregation and the orientation of grains had key roles in the observed grain boundary delamination of the sensitized material.     

骨折术后运动康复安全评定的几点体会

骨科学以运动系统疾病为对象,功能康复是骨科疾病治疗的最终目的。骨科治疗与康复是不可分割的整体。但骨科治疗与康复往往未能很好地结合,探索将两个学科有机地结合起来的安全运动康复评定的几点体会,制定出合理的运动处方,为较大限度地提高骨折疾病的功能疗效。     

‘Crossing culture’: a multi‐method enquiry into consumer behaviour and the experience of cultural transition

Visitors, travellers and migrants have a range of reactions to ‘crossing culture’, ie moving from one cultural environment to another. This paper reports a two‐stage multi‐method study that examines how visitors' consumer behaviour and use of material possessions influence resolution of cultural fracture during periods of cultural transition. The research consisted of a quantitative survey (n = 598) and a qualitative ethnoconsumerist study of visitors to the UK. Analysis of the survey data shows that nationality is a poor indicator of crossing‐culture experiences. A Six Typology Model of Cultural Fracture identified six cluster groups using combinations of three types of cultural fracture experience: symbolic fracture, emotional fracture and functional fracture. The six clusters vary by consumer behaviour and possession use. The ethnoconsumerist study illustrates that consumer‐related activities and possession used together provide an important resource that visitors can use to make sense of crossing‐culture experiences. Product categories, retail formats and shopping conventions are also implicated in experiences of cultural fracture to varying degrees. The paper concludes by considering the limitations of importing a priori assumptions regarding nationality and ethnic differences in cross‐cultural consumer research, and discusses some of the potential benefits of multi‐method research in this context. Copyright © 2004 Henry Stewart Publications.