6,560 research outputs found
Stability of vortex in a two-component superconductor
Thermodynamic stability of composite vortex in a two-component superconductor
is investigated by the Ginzburg-Landau theory. The predicted nature of these
vortices has recently attracted much attention. Here we consider axially
symmetric quantized vortex and show that the stability of vortex depends on
three independent dimensionless parameters: , ,
, where is the Ginzburg-Landau parameter of
individual component, is the ratio of two
coherence lengths. We also show that there exists thermodynamic stable vortex
in type-1+type-2 or type-2+type-2 materials over a range of these three
parameters.Comment: 7 pages, 2 figure
A Socially-Aware Incentive Mechanism for Mobile Crowdsensing Service Market
Mobile Crowdsensing has shown a great potential to address large-scale
problems by allocating sensing tasks to pervasive Mobile Users (MUs). The MUs
will participate in a Crowdsensing platform if they can receive satisfactory
reward. In this paper, in order to effectively and efficiently recruit
sufficient MUs, i.e., participants, we investigate an optimal reward mechanism
of the monopoly Crowdsensing Service Provider (CSP). We model the rewarding and
participating as a two-stage game, and analyze the MUs' participation level and
the CSP's optimal reward mechanism using backward induction. At the same time,
the reward is designed taking the underlying social network effects amid the
mobile social network into account, for motivating the participants. Namely,
one MU will obtain additional benefits from information contributed or shared
by local neighbours in social networks. We derive the analytical expressions
for the discriminatory reward as well as uniform reward with complete
information, and approximations of reward incentive with incomplete
information. Performance evaluation reveals that the network effects
tremendously stimulate higher mobile participation level and greater revenue of
the CSP. In addition, the discriminatory reward enables the CSP to extract
greater surplus from this Crowdsensing service market.Comment: 7 pages, accepted by IEEE Globecom'1
- …