Bach Goes to Town

Wi - Fi Goes to Town : Seamless Internet Connectivity in Metropolitan Underground Transport 8 January 2015

In recent years we have seen Wi-Fi move from a “hotspot” model to fuller coverage patterns where connectivity is available everywhere, such as across university and enterprise campuses (recall, for example, the Eduroam service). As people have come to expect more from Wi-Fi of late, there has been concurrent interest in blanketing underground transit systems with wireless coverage, from Transpo...

Bach in Mind

Groupware Goes to School

Groupware for cooperative work (CSCW) and for collaborative learning (CSCL) have many important commonalities as well as different requirements. By transforming a generic CSCW platform into an environment to support a particular vision of education as collaborative knowledge building, we saw how functionality had to be adopted, transformed and refined to meet the specific educational social set...

Discrimination Goes to School

We investigate the extent to which racial discrimination, in the form of the biased assessment of students, is prevalent within Brazilian schools. Robust evidence is drawn from unique data pertaining to middle-school students and educators. We nd that even after holding constant performance in blindly scored o cial tests of pro ciency, teacher-assigned Math grades su er from bias. Relative to a...

A conserved Bach current

The Bach tensor and a vector which generates conformal symmetries allow a conserved 4-current to be defined. The Bach 4-current gives rise to a quasilocal 2-surface expression for power per luminosity distance in the Vaidya exterior of collapsing fluid interiors. This is interpreted in terms of entropy generation. PACS numbers: 0420J, 0440N