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This book is a printed edition of the Special Issue “Energy Harvesters and Self-Powered Sensors for Smart Electronics” that was published in Micromachines, which showcases the rapid development of various energy harvesting technologies and novel devices. In the current 5G and Internet of Things (IoT) era, energy demand for numerous and widely distributed IoT nodes has greatly driven the innovation of various energy harvesting technologies, providing key functionalities as energy harvesters (i.e., sustainable power supplies) and/or self-powered sensors for diverse IoT systems. Accordingly, this book includes one editorial and nine research articles to explore different aspects of energy harvesting technologies such as electromagnetic energy harvesters, piezoelectric energy harvesters, and hybrid energy harvesters. The mechanism design, structural optimization, performance improvement, and a wide range of energy harvesting and self-powered monitoring applications have been involved. This book can serve as a guidance for researchers and students who would like to know more about the device design, optimization, and applications of different energy harvesting technologies.

energy harvesting --- vibration --- broadband --- resonant frequency --- piezoelectric vibration energy harvester --- low frequency --- wideband --- modeling --- energy harvester --- temperature threshold --- piezoelectricity --- vibrational cantilever --- bimetallic effect --- piezoelectric --- optimization --- pattern search --- FEM --- PZT --- electromagnetic --- hybrid energy harvester --- power density improvement --- piezoelectric energy harvester --- tandem --- vortex-induced vibration --- flowing water --- vibration energy harvesting --- electromagnetic generator (EMG) --- nonlinear --- magnetic coupling --- high performance --- diamagnetically stabilized levitation --- Taguchi method --- stable levitation --- maximum gap --- electromagnetic energy harvester --- human body kinetic energy --- n/a

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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

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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

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The papers published in this Special Issue “WP3—Innovation in Agriculture and Forestry Sector for Energetic Sustainability” bring together some of the latest research results in the field of biomass valorization and the process of energy production and climate change and other areas relevant to energetic sustainability [1–20]. Moreover, several works address the very important topic of evaluating the safety aspects for energy plant use [21–24]. Responses to our call generated the following statistics:• Submissions (21);• Publications (15);• Rejections (6);• Article types: research articles (13), reviews (2). Of the submitted papers, 15 have been successfully published as articles. Reviewing and selecting the papers for this Special Issue was very inspiring and rewarding. We also thank the editorial staff and reviewers for their efforts and help during the process. For better comprehension, the contributions to this Special Issue are divided into sections, as follows.

biomass waste --- gasification --- power generation --- internal combustion engine --- CHP --- Aspen Plus --- rotary dryer --- drying process --- thermal energy --- wood chips --- life cycle analysis --- environmental valuation --- biochar --- willow --- pig manure --- renewable energy --- biomass --- olive pomace --- combustion --- ORC --- working fluid --- beet tops --- rotary cutting device --- tractor --- oscillations --- differential equations --- optimal parameters --- biomass production --- greenhouse --- multiple environmental parameters --- interactive optimization scheme --- spatial distributed factors --- online–offline strategy --- CFD-EA --- chipping --- pellet --- poplar --- SRWC --- pelletization --- biomass quality --- energy quality --- horse skidding --- winch skidding --- cable yarder --- life cycle assessment --- societal assessment --- economic assessment --- multi-criteria decision analysis --- sustainable forest management --- innovation --- agriculture --- forestry --- energy --- sustainability --- updraft --- syngas --- oxidizing agent --- energy saving --- efficiency --- controlled environment --- agricultural residues --- market --- anaerobic digestion --- global warming potential --- externalities --- compost --- woody pellet --- agropellet --- quality --- standards --- blending --- sugar beet --- beet top cutting --- tractor–harvester aggregate --- n/a --- online-offline strategy --- tractor-harvester aggregate

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The papers published in this Special Issue “WP3—Innovation in Agriculture and Forestry Sector for Energetic Sustainability” bring together some of the latest research results in the field of biomass valorization and the process of energy production and climate change and other areas relevant to energetic sustainability [1–20]. Moreover, several works address the very important topic of evaluating the safety aspects for energy plant use [21–24]. Responses to our call generated the following statistics:• Submissions (21);• Publications (15);• Rejections (6);• Article types: research articles (13), reviews (2). Of the submitted papers, 15 have been successfully published as articles. Reviewing and selecting the papers for this Special Issue was very inspiring and rewarding. We also thank the editorial staff and reviewers for their efforts and help during the process. For better comprehension, the contributions to this Special Issue are divided into sections, as follows.

Technology: general issues --- biomass waste --- gasification --- power generation --- internal combustion engine --- CHP --- Aspen Plus --- rotary dryer --- drying process --- thermal energy --- wood chips --- life cycle analysis --- environmental valuation --- biochar --- willow --- pig manure --- renewable energy --- biomass --- olive pomace --- combustion --- ORC --- working fluid --- beet tops --- rotary cutting device --- tractor --- oscillations --- differential equations --- optimal parameters --- biomass production --- greenhouse --- multiple environmental parameters --- interactive optimization scheme --- spatial distributed factors --- online-offline strategy --- CFD-EA --- chipping --- pellet --- poplar --- SRWC --- pelletization --- biomass quality --- energy quality --- horse skidding --- winch skidding --- cable yarder --- life cycle assessment --- societal assessment --- economic assessment --- multi-criteria decision analysis --- sustainable forest management --- innovation --- agriculture --- forestry --- energy --- sustainability --- updraft --- syngas --- oxidizing agent --- energy saving --- efficiency --- controlled environment --- agricultural residues --- market --- anaerobic digestion --- global warming potential --- externalities --- compost --- woody pellet --- agropellet --- quality --- standards --- blending --- sugar beet --- beet top cutting --- tractor-harvester aggregate