This paper presents a new strategy to form P2P IP Telephony overlay for wireless ad-hoc networks. In the proposed strategy a structured P2P system is considered where some nodes, called supernodes, with higher capacity form the overlay and provide registry and call routing services. As selection and admission of new super-nodes in wireless ad-hoc networks is more challenging than backbone netwo...

Two super-integrable and super-separable classical systems which can be considered as deformations of the harmonic oscillator and the Smorodinsky–Winternitz in two dimensions are studied and identified with motions in spaces of constant curvature, the deformation parameter being related with the curvature. In this sense these systems are to be considered as a harmonic oscillator and a Smorodins...

We report the characterisation of a multi-planetary system composed five exoplanets orbiting K-dwarf HD~23472 (TOI-174). In addition to two super-Earths that were previously confirmed, we confirm and characterise three Earth-size planets in using ESPRESSO radial velocity observations. The this compact have periods $P_d \sim 3.98\,$, $P_e 7.90\,$, $P_f 12.16\,$, $P_b 17.67,\,$ $P_c 29.80\,$days ...

Two-dimensional supergravity theory is quantized as an anomalous gauge theory. In the Batalin-Fradkin (BF) formalism, the anomaly-canceling super-Liouville fields are introduced to identify the original second-class constrained system with a gauge-fixed version of a first-class system. The BFV-BRST quantization applies to formulate the theory in the most general class of gauges. A local effecti...