Properties of Solutions in 2+1 Dimensions

We solve the Einstein equations for the 2+1 dimensions with and without scalar fields. We calculate the entropy, Hawking temperature and the emission probabilities for these cases. We also compute the Newman-Penrose coefficients for different solutions and compare them.Comment: 16 pages, 1 figures, PlainTeX, Dedicated to Prof. Yavuz Nutku on his 60th birthday. References adde

Topics in Noncommutative Geometry Inspired Physics

In this review article we discuss some of the applications of noncommutative geometry in physics that are of recent interest, such as noncommutative many-body systems, noncommutative extension of Special Theory of Relativity kinematics, twisted gauge theories and noncommutative gravity.Comment: New references added, Published online in Foundations of Physic

Novel nonionic surfactants based on sulfoxides. 2. Homo- and copolymers

The synthesis of new nonionic amphiphilic polymers of the polysoap type is described, as well as their general behaviour in aqueous solution. The polymers were prepared by homopolymerisation of acrylate polymerisable surfactants (or "surfmers"), which bear the nonionic sulfoxide moiety. Alternatively, small hydrophilic acrylate and acrylamide monomers bearing the nonionic sulfoxide moiety were copolymerised with dodecylacrylate and N-dodecyl-N-methylacrylamide. Compared to many other nonionic hydrophilic fragments, a single sulfoxide group behaves as a strongly hydrophilic fragment of small volume. However, its relative hydrophilicity depends sensitively on its precise positioning in the polymers. Properly placed, three sulfoxide groups can balance up to two dodecyl chains to obtain still water-soluble polymers that exhibit typical polysoap properties. Some of the new nonionic polymers show lyotropic liquid-crystalline behaviour at ambient temperature

Oto-èmissions provoquées. Données normatives pour une population normale de nouveau-nés et d'adultes.

We tested the availability of the commercial oto-acoustic device "ILO88" on adults and neonates. We describe a simple method to quickly obtain reliable results with this material. We also tested the possibility of recording evoked oto-acoustic emissions on ears with grommets tubes.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Oto-émissions provoquées: résultats chez le nouveau-né à risque.

Fourty newborns (80 ears) from the intensive care unit were tested with evoked oto-acoustic emission (EOAE). The occurrence of EOAE was 93%.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Les oto-émissions provoquées. Résultats chez le nouveau-né.

Fifty-four children (104 ears) were examined by the basal echo test technique (Evoked acoustic emissions). The value as screening test is discussed.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

The occurrence of evoked oto-acoustic emissions in a normal adult population and neonates

In our study, 71 normal-hearing ears from adults and 39 from neonates (n= 110) were tested by the advanced echo test technique devised and described by Kemp (ILO 88). Almost all ears (97% and 95%) showed emissions. This material is convenient for clinical routine in adults and for neonatal screening.SCOPUS: ar.jinfo:eu-repo/semantics/publishe