Efficient On-Demand Multi-Node Charging Techniques for Wireless Sensor Networks Lyes Khelladi 1 , Djamel Djenouri 1 , Michele Rossi 2 , Nadjib Badache 1,3 1 CERIST Research Center, Algiers, Algeria 2 Department of Information Engineering, University of Padova, Padova, Italy 3 Department of Computer Science, USTHB University, Algiers, Algeria lkhelladi@cerist.dz, ddjenouri@cerist.dz, rossi@dei.unipd.it, badache@cerist.dz Preprint submitted to Elsevier September 20, 2016 brought to you by CORE View metadata, citation and similar papers at core.ac.uk provided by UWE Bristol Research Repository