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Wireless power transfer allows the transfer of energy from a transmitter to a receiver across an air gap, without any electrical connections. Technically, any device that needs power can become an application for wireless power transmission. The current list of applications is therefore very diverse, from low-power portable electronics and household devices to high-power industrial automation and electric vehicles. With the rise of IoT sensor networks and Industry 4.0, the presence of wireless energy transfer will only increase. In order to improve the current state of the art, models are being developed and tested experimentally. Such models allow simulating, quantifying, predicting, or visualizing certain aspects of the power transfer from transmitter(s) to receiver(s). Moreover, they often result in a better understanding of the fundamentals of the wireless link. This book presents a wonderful collection of peer-reviewed papers that focus on the modelling of wireless power transmission. It covers both inductive and capacitive wireless coupling and includes work on multiple transmitters and/or receivers.

History of engineering & technology --- resonance-based wireless power transfer (R-WPT) --- resonance frequency --- power transfer efficiency (PTE) --- 3-coil system --- steady-state matrix analysis --- Class-E power amplifier --- wireless power transfer (WPT) system --- output characteristics --- strength --- coupling coefficient --- impedance matrix --- multiple coils --- mutual inductance --- scattering matrix --- transfer impedance --- wireless power transfer --- design optimization --- finite element analysis --- gallium nitride --- gradient methods --- inductive power transmission --- power measurement --- transformer cores --- wireless charging --- circuit modeling --- numerical analysis --- capacitive wireless power transfer --- resonance --- power-transfer efficiency --- multiports --- multiple-input single-output --- wireless power transmission --- electric field --- shielded-capacitive power transfer --- design guidelines --- resonant --- inductive coupling --- optimal load --- single-input multiple-output --- power gain

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Wireless power transfer allows the transfer of energy from a transmitter to a receiver across an air gap, without any electrical connections. Technically, any device that needs power can become an application for wireless power transmission. The current list of applications is therefore very diverse, from low-power portable electronics and household devices to high-power industrial automation and electric vehicles. With the rise of IoT sensor networks and Industry 4.0, the presence of wireless energy transfer will only increase. In order to improve the current state of the art, models are being developed and tested experimentally. Such models allow simulating, quantifying, predicting, or visualizing certain aspects of the power transfer from transmitter(s) to receiver(s). Moreover, they often result in a better understanding of the fundamentals of the wireless link. This book presents a wonderful collection of peer-reviewed papers that focus on the modelling of wireless power transmission. It covers both inductive and capacitive wireless coupling and includes work on multiple transmitters and/or receivers.

History of engineering & technology --- resonance-based wireless power transfer (R-WPT) --- resonance frequency --- power transfer efficiency (PTE) --- 3-coil system --- steady-state matrix analysis --- Class-E power amplifier --- wireless power transfer (WPT) system --- output characteristics --- strength --- coupling coefficient --- impedance matrix --- multiple coils --- mutual inductance --- scattering matrix --- transfer impedance --- wireless power transfer --- design optimization --- finite element analysis --- gallium nitride --- gradient methods --- inductive power transmission --- power measurement --- transformer cores --- wireless charging --- circuit modeling --- numerical analysis --- capacitive wireless power transfer --- resonance --- power-transfer efficiency --- multiports --- multiple-input single-output --- wireless power transmission --- electric field --- shielded-capacitive power transfer --- design guidelines --- resonant --- inductive coupling --- optimal load --- single-input multiple-output --- power gain --- resonance-based wireless power transfer (R-WPT) --- resonance frequency --- power transfer efficiency (PTE) --- 3-coil system --- steady-state matrix analysis --- Class-E power amplifier --- wireless power transfer (WPT) system --- output characteristics --- strength --- coupling coefficient --- impedance matrix --- multiple coils --- mutual inductance --- scattering matrix --- transfer impedance --- wireless power transfer --- design optimization --- finite element analysis --- gallium nitride --- gradient methods --- inductive power transmission --- power measurement --- transformer cores --- wireless charging --- circuit modeling --- numerical analysis --- capacitive wireless power transfer --- resonance --- power-transfer efficiency --- multiports --- multiple-input single-output --- wireless power transmission --- electric field --- shielded-capacitive power transfer --- design guidelines --- resonant --- inductive coupling --- optimal load --- single-input multiple-output --- power gain

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Information and communication technology (ICT) is reponsible for up to 10% of world power consumption. In particular, communications and computing systems are indispensable elements in ICT; thus, determining how to improve the energy efficiency in communications and computing systems has become one of the most important issues for realizing green ICT. Even though a number of studies have been conducted, most of them focused on one aspect—either communications or computing systems. However, salient features in communications and computing systems should be jointly considered, and novel holistic approaches across communications and computing systems are strongly required to implement energy-efficient systems. In addition, emerging systems, such as energy-harvesting IoT devices, cyber-physical systems (CPSs), autonomous vehicles (AVs), and unmanned aerial vehicles (UAVs), require new approaches to satisfy their strict energy consumption requirements in mission-critical situations. The goal of this Special Issue is to disseminate the recent advances in energy-efficient communications and computing systems. Review and survey papers on these topics are welcome. Potential topics include, but are not limited to, the following: • energy-efficient communications: from physical layer to application layer; • energy-efficient computing systems; • energy-efficient network architecture: through SDN/NFV/network slicing; • energy-efficient system design; • energy-efficient Internet of Things (IoT) and Industrial IoT (IIoT); • energy-efficient edge/fog/cloud computing; • new approaches for energy-efficient computing and communications (e.g., AI/ML and data-driven approaches); • new performance metrics on energy efficiency in emerging systems; • energy harvesting and simultaneous wireless information and power transfer (SWIPT); • smart grid and vehicle-to-grid (V2G); and • standardization and open source activities for energy efficient systems.

UAV --- relay --- cooperative communications --- buffer --- power control --- energy efficiency --- energy-neutral operation --- wireless powered sensor network --- simultaneous wireless information and power transfer --- energy harvesting --- clustering --- offloading --- Internet of Things (IoT) --- energy --- constraint Markov decision process (CMDP) --- optimization --- computation offloading --- mobile edge computing --- lyapunov optimization --- 1-bit unit cell --- coding metasurface --- adaptive beam focusing --- wireless power transfer --- UAV network --- topology control --- space division

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Information and communication technology (ICT) is reponsible for up to 10% of world power consumption. In particular, communications and computing systems are indispensable elements in ICT; thus, determining how to improve the energy efficiency in communications and computing systems has become one of the most important issues for realizing green ICT. Even though a number of studies have been conducted, most of them focused on one aspect—either communications or computing systems. However, salient features in communications and computing systems should be jointly considered, and novel holistic approaches across communications and computing systems are strongly required to implement energy-efficient systems. In addition, emerging systems, such as energy-harvesting IoT devices, cyber-physical systems (CPSs), autonomous vehicles (AVs), and unmanned aerial vehicles (UAVs), require new approaches to satisfy their strict energy consumption requirements in mission-critical situations. The goal of this Special Issue is to disseminate the recent advances in energy-efficient communications and computing systems. Review and survey papers on these topics are welcome. Potential topics include, but are not limited to, the following: • energy-efficient communications: from physical layer to application layer; • energy-efficient computing systems; • energy-efficient network architecture: through SDN/NFV/network slicing; • energy-efficient system design; • energy-efficient Internet of Things (IoT) and Industrial IoT (IIoT); • energy-efficient edge/fog/cloud computing; • new approaches for energy-efficient computing and communications (e.g., AI/ML and data-driven approaches); • new performance metrics on energy efficiency in emerging systems; • energy harvesting and simultaneous wireless information and power transfer (SWIPT); • smart grid and vehicle-to-grid (V2G); and • standardization and open source activities for energy efficient systems.

History of engineering & technology --- UAV --- relay --- cooperative communications --- buffer --- power control --- energy efficiency --- energy-neutral operation --- wireless powered sensor network --- simultaneous wireless information and power transfer --- energy harvesting --- clustering --- offloading --- Internet of Things (IoT) --- energy --- constraint Markov decision process (CMDP) --- optimization --- computation offloading --- mobile edge computing --- lyapunov optimization --- 1-bit unit cell --- coding metasurface --- adaptive beam focusing --- wireless power transfer --- UAV network --- topology control --- space division --- UAV --- relay --- cooperative communications --- buffer --- power control --- energy efficiency --- energy-neutral operation --- wireless powered sensor network --- simultaneous wireless information and power transfer --- energy harvesting --- clustering --- offloading --- Internet of Things (IoT) --- energy --- constraint Markov decision process (CMDP) --- optimization --- computation offloading --- mobile edge computing --- lyapunov optimization --- 1-bit unit cell --- coding metasurface --- adaptive beam focusing --- wireless power transfer --- UAV network --- topology control --- space division

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As users, we require more and more reliable and longer operation of electronic devices. Most often, the efforts of scientists and engineers related to energy management, energy conversion, and energy storage are overlooked. The PowerMEMS slogan in its meaning hides the science of materials enabling the construction of modern accumulators and batteries, so important for the developing consumer electronics and electromobility; energy harvesters used wherever conventional power sources cannot be used; and finally the methods and algorithms of energy processing and management that increase the efficiency of the devices they operate. This Special Issue contains six research papers selected from those presented at the 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (Power MEMS 2019), as and representative of all papers presented during the Conference.

History of engineering & technology --- coils --- wireless power transfer --- electrically small antennas --- e-textiles --- internet of things --- wireless energy harvesting --- thermoelectrics --- GeTe --- LiI as dopant --- enhanced power factor --- suppressed thermal transport --- triboelectric nanogenerator (TENG) --- mechanical energy harvesting --- single-electrode --- tapping --- flexibility --- porous/rough PDMS --- parylene C --- hermetic packaging --- IoT --- MEMS --- microbattery --- battery --- harvester --- tracker --- wildlifetracking --- heat flux --- thermal resistance --- thermal conductance --- thermal energy harvesting --- endothermic animal --- fur --- 3D printing --- energy harvester