Comparisons between two empirical yield criteria for rock masses

In general, rock masses are inhomogeneous, discontinuous media composed of rock material and naturally occurring discontinuities such as joints, fractures and bedding planes. Because of these features, the strength of rock masses is notoriously difficult to assess. Nonetheless, many criteria have been proposed for estimating rock mass strength. Based on the finite element upper and lower bound limit analysis methods, this study examined two empirical yield criteria for rock masses, the Hoek-Brown failure criterion (2002) and the Douglas criterion (2002). The comparisons showed that very different results may be obtained using the same input parameters. Therefore, it is interesting to discuss the source of these differences.

I was running away from death - the pre-flight experiences of unaccompanied asylum seeking children in the UK

OBJECTIVE: To collect information about the pre-flight experiences of unaccompanied asylum seeking children (UASC) in the UK to increase the understanding of support needed on arrival in the UK. METHODS: Retrospective social services case file and legal statement review and semi-structured in-depth interviews with 100 UASC. RESULTS: Nearly half of all UASC have experienced separation from or loss of parents and/or family members (47%), and a further 41% had personally experienced or witnessed violence. Sexual violence (such as rape) was reported by 24% of African girls. Many children reported complex journeys to the UK. CONCLUSIONS: UASC arrive in the UK with a variety of potentially traumatic experiences. Whilst research is starting to identify some of the experiences of UASC, further culturally appropriate research is needed to identify their health and social needs after arrival. Further research will help to identify the specific experiences of UASC, indicating where services should be improved to deal with their complex and diverse needs.

Leaving care: unaccompanied asylum seeking young Afghans facing return

Unaccompanied asylum-seeking children in the United Kingdom approach adulthood knowing that they will be encouraged or even forced to return to their countries of birth. Drawing on a project that promoted voluntary return to Afghanistan, we use interviews with twelve young people, professionals working in the Home Office and in education, local authorities, and voluntary-sector agencies to describe a complex area of immigration policy. We show how the state’s obligations as “corporate parent” clash with increasingly punitive migration controls and with growing political scrutiny of public spending. We propose education as a way to prepare young people for futures as global citizens in either country of settlement or of origin.

Clouds for masses - toward ubiquitous and transparent clouds

Since the development of the computer, user orientated innovations such as graphical operating systems, mice, and mobile devices have made computing ubiquitous in modern society. The cloud is the next step in this process. Through the cloud, computing has undergone co modification and has been made available as a utility. However, in comparison to other commodities such as water and electricity, clouds (in particular IaaS and PaaS) have not reached the same penetration into the global market. We propose that through further abstraction, future clouds will be ubiquitous and transparent, made accessible to ordinary users and integrated into all aspects of society. This paper presents a concept and path to this ubiquitous and transparent cloud, accessible by the masses.