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Electron–Phonon Interactions and the Intrinsic Electrical Resistivity of Graphene
Park, Cheol-Hwan,Bonini, Nicola,Sohier, Thibault,Samsonidze, Georgy,Kozinsky, Boris,Calandra, Matteo,Mauri, Francesco,Marzari, Nicola American Chemical Society 2014 NANO LETTERS Vol.14 No.3
<P>We present a first-principles study of the temperature- and density-dependent intrinsic electrical resistivity of graphene. We use density-functional theory and density-functional perturbation theory together with very accurate Wannier interpolations to compute all electronic and vibrational properties and electron–phonon coupling matrix elements; the phonon-limited resistivity is then calculated within a Boltzmann-transport approach. An effective tight-binding model, validated against first-principles results, is also used to study the role of electron–electron interactions at the level of many-body perturbation theory. The results found are in excellent agreement with recent experimental data on graphene samples at high carrier densities and elucidate the role of the different phonon modes in limiting electron mobility. Moreover, we find that the resistivity arising from scattering with transverse acoustic phonons is 2.5 times higher than that from longitudinal acoustic phonons. Last, high-energy, optical, and zone-boundary phonons contribute as much as acoustic phonons to the intrinsic electrical resistivity even at room temperature and become dominant at higher temperatures.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-3/nl402696q/production/images/medium/nl-2013-02696q_0006.gif'></P>
Clustering and Communications Scheduling in WSNs using Mixed Integer Linear Programming
Avril, Francois,Bernard, Thibault,Bui, Alain,Sohier, Devan The Korea Institute of Information and Commucation 2014 Journal of communications and networks Vol.16 No.4
We consider the problem of scheduling communications in wireless sensor networks (WSNs) to ensure battery preservation through the use of the sleeping mode of sensors.We propose a communication protocol for 1-hop WSNs and extend it to multi-hop WSNs through the use of a 1-hop clustering algorithm.We propose to schedule communications in each cluster in a virtual communication ring so as to avoid collisions. Since clusters are cliques, only one sensor can speak or listen in a cluster at a time, and all sensors need to speak in each of their clusters at least once to realize the communication protocol. We model this situation as a mathematical program.
Clustering and Communications Scheduling in WSNs using Mixed Integer Linear Programming
François Avril,Thibault Bernard,Alain Bui,Devan Sohier 한국통신학회 2014 Journal of communications and networks Vol.16 No.4
We consider the problem of scheduling communicationsin wireless sensor networks (WSNs) to ensure battery preservationthrough the use of the sleeping mode of sensors.We propose a communicationprotocol for 1-hop WSNs and extend it to multi-hopWSNs through the use of a 1-hop clustering algorithm.We proposeto schedule communications in each cluster in a virtual communicationring so as to avoid collisions. Since clusters are cliques, onlyone sensor can speak or listen in a cluster at a time, and all sensorsneed to speak in each of their clusters at least once to realize thecommunication protocol. We model this situation as a mathematicalprogram.
B?atrice Parguel,Karine Charry,Ga?lle Pantin Sohier,Fanny Thomas 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07
Considering meat consumption's massive impact on climate change, environmental NGOs are increasingly campaigning to encourage consumers to reduce unsustainable meat consumption, i.e., to eat less and/or better meat. They usually use messages based on environmental appeals to do so. Yet, the effectiveness of such appeals in international campaigns may depend on countries as cultural beliefs influence food consumption behaviors. Therefore, in this research, we explore the effectiveness of such campaigns across 5 European countries, controlling for individual cultural orientations. Considering an environmental degradation appeal, we first show that countries have no influence on the campaign’s effectiveness, unlike specific individual cultural orientations, including masculinity and uncertainty avoidance. We replicate these results in the same 5 countries considering an alternative appeal, i.e., animal welfare. Recommendations to international NGOs managers result from these results.