Comment on Rehm and Room

Comment on "Room Temperature Electrically Injected Polariton Laser".

In a recent paper, Bhattacharya and co-workers [1] claim the observation of an electrically driven room-temperature polariton laser. This is an outstanding claim. The technological solution proposed in Ref. [1] looks very interesting, and merits our close inspection. Contrary to the standard structure for polariton lasing [2,3], where a planar micro-cavity is excited through the distributed Bra...

Farewell Prof. Hans‐Jürgen Rehm

It is a great honor and duty for me to remember Prof. Dr. Hans-J€ urgen Rehm, born on 3 December 1927, who passed away in M€ unster, Germany, on 4 February 2017. Since 1970, he was director of the Institute of Microbiology at the University of M€ unster, Germany, where I had the great honor to be his Diploma student and also did my PhD under his supervision. With his textbook ‘Industrielle Mikr...

on semihypergroups and hypergroups

in this thesis, first the notion of weak mutual associativity (w.m.a.) and the necessary and sufficient condition for a $(l,gamma)$-associated hypersemigroup $(h, ast)$ derived from some family of $lesssim$-preordered semigroups to be a hypergroup, are given. second, by proving the fact that the concrete categories, semihypergroups and hypergroups have not free objects we will introduce t...

Comment on: Deuterium nuclear fusion at room temperature: A pertinent inequality on barrier penetration

Comment on "Identification and use of operating room efficiency indicators: the problem of definition".