Isotopic effects on the thermal conductivity of graphene nanoribbons: localization mechanism

Thermal conductivity of graphene nanoribbons (GNR) with length 106~{\AA} and width 4.92~{\AA} after isotopic doping is investigated by molecular dynamics with quantum correction. Two interesting phenomena are found: (1) isotopic doping reduces thermal conductivity effectively in low doping region, and the reduction slows down in high doping region; (2) thermal conductivity increases with increasing temperature in both pure and doped GNR; but the increasing behavior is much more slowly in the doped GNR than that in pure ones. Further studies reveal that the physics of these two phenomena is related to the localized phonon modes, whose number increases quickly (slowly) with increasing isotopic doping in low (high) isotopic doping region.Comment: 6 fig

The Role of Social Media Technologies in Service Innovation: Perceptions of Exceptional-customer-engaged Value Co-creation

Social media technologies have greatly facilitated customers’ self-empowerment, and have given rise to a handful of exceptional customers who engage in service innovation. Compared with the more common customer behaviors like word-of-mouth and review-and-feedback, exceptional customers actively integrate their heterogeneous resources and creatively cooperate with firms to innovate service. Nevertheless, there have been relatively few studies on how information technologies enable such customer engagement and the co-creation of service innovation. We adopted a qualitative approach and conducted a comparative analysis of two cases, including a pair of firms and their cooperating exceptional customers, to reveal two value co-creation mechanisms enabled by social media technologies: customers as communicators who facilitate the individualization of product promotion through resource sharing and digital engagement with firms; and customers as innovators who facilitate the individualization of brand design through resource convergence and co-creation of new value propositions with firms. This study discovered the enabler role of social media technologies in service innovation and value co-creation between firms and exceptional customers, as well as a theoretical basis and practical guidance for market innovation in the digital era

Extracting Event Dynamics from Event-by-Event Analysis

The problem of eliminating the statistical fluctuations and extracting the event dynamics from event-by-event analysis is discussed. New moments $G_p$ (for continuous distribution), and $G_{q,p}$ (for anomalous distribution) are proposed, which are experimentally measurable and can eliminate the Poissonian type statistical fluctuations to recover the dynamical moments $C_p$ and $C_{q,p}$. In this way, the dynamical distribution of the event-averaged transverse momentum \bar{\pt} can be extracted, and the anomalous scaling of dynamical distribution, if exists, can be recovered, through event-by-event analysis of experimental data.Comment: 15 pages, 2 eps figures, Phys. Rev. C accepte