In this fourth paper of the series, I clarify the somewhat mysterious relation between the large class of orientation orbifolds (with twisted open-string CFT’s at ĉ = 52) and orientifolds (with untwisted open strings at c = 26), both of which have been associated to division by world-sheet orientation-reversing automorphisms. In particular – following a spectral clue in the previous paper – I s...

Members of the 67th World Health Assembly in 2014 were presented with a framework document to guide World Health Organization (WHO) engagement with non-state actors, a key part of WHO reform kick-started in 2011. According to this document, non-state actors include four distinct constituencies: i) nongovernmental organizations (NGOs), ii) private sector entities; iii) philanthropic foundations;...

An estimation problem of the mean µ of an inverse Gaussian distribution IG(µ, C µ) with known coefficient of variation c is treated as a decision problem with entropy loss function. A class of Bayes estimators is constructed, and shown to include MRSE estimator as its closure. Two important members of this class can easily be computed using continued fractions

The Electronic System and Information Technology Research Group at Brunel University has designed a multifaceted navigation system for blind and visually impaired pedestrians. The primary operation of the system mimics the advantages of an informed sighted guide by using Global Positioning Systems and remote (sighted on the user) video cameras as navigational sensors. The information generated ...