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energy-Efficient Bandwidth and Power Allocation in Relay-Assisted Multi-Layer Heterogeneous Networks with energy harvesting

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Journal of Shanghai Jiaotong university(Science) 2023年第6期28卷 822-830页

作者：高锦程赵宜升陈加法陈忠辉 Fujian Key Laboratory for Intelligent Processing and Wireless Transmission of Media Information College of Physics and Information EngineeringFuzhou UniversityFuzhou 350108China

Aiming at excessive users existing in a pico base station(PBS)in the multi-layer heterogeneous networks,the resource allocation problem of maximizing the energy efficiency of the networks is investigated in this *** deploying a relay node with energy harvesting function,the data of some users in the PBS can be transferred to an adjacent idle *** bandwidth and transmitting power of users and the relay node are both considered to formulate the resource allocation optimization *** objective is to maximize the energy eficiency of the whole heterogeneous networks under the constraints of the user's minimum data rate and energy *** suboptimal solution is obtained by using the particle swarm optimization(PSO)algorithm and quantum-behaved particle swarm optimization(QPSO)*** results show that the adopted methods have higher energy efficiency than the conventional fixed power and bandwidth *** addition,the time complexity of the adopted methods is relatively low.

关键词： energy harvesting heterogeneous networks energy efficiency

A high-performance, single-electrode and stretchable piezotriboelectric hybrid patch for omnidirectional biomechanical energy harvesting and motion monitoring

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Journal of Materiomics 2022年第5期8卷 958-966页

作者： Xiaojuan Hou Jixin Zhong Changjun Yang Yun Yang Jian He Jiliang Mu Wenping Geng Xiujian Chou Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan030051China Shanxi Province Key Laboratory of Quantum Sensing and Precision Measurement North University of ChinaTaiyuan030051China

Triboelectric nanogenerators(TENGs)have recently drawn much attention in the field of biomechanical energy harvesting and motion ***,the electrode stretchability and contact-separation model induced complicated packed structure remain a problem that heavily affects output performance during various human movements and requires to be urgently ***,a single-electrode piezotriboelectric hybrid nanogenerator(SEP-TENG)integrated with stretchable liquid-metal metal electrodes is reported,which simultaneously achieves outstanding energy harvesting performance and skincomfort human motion monitoring.A polarized piezoelectric BaTiO_(3)/silicon rubber(SR)composites film is served as the effective negative tribomaterial,benefiting from the improved dielectric constant and piezoelectric charge transfer,the optimized SEP-TENG generates a high peak power density of 5.7 W/m^(2) while contacted with human ***,owing to the ultralow Young's modulus of the SR encapsulation layer and tribo-piezoelectric hybrid layer,the homogeneous integrated multilayer composite serves no break till a 745%elongation,promoting that the SEP-TENG could effectively harvest biomechanical energy and realize stable power supplying for wearable electronics even under large deformation ***,the SEP-TENG could comfortably attach to the finger joints and collect bending *** work provides a novel design methodology for a single-electrode TENG to realize omnidirectional biomechanical energy harvesting and motion monitoring.

关键词： Triboelectric nanogenerators High-performance Single-electrode Stretchable energy harvesting Motion monitoring

Optimization of Photovoltaic Reflector System for Indoor energy harvesting

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Journal of Harbin Institute of Technology(New Series) 2022年第4期29卷 65-69页

作者： Chan Mieow Kee Siaw Fei Lu Angela Gunasegaran Shubashinee Murugan Raajeswari Radahakrishnan Shasonniaah Vjay Nair Vijaya Kumaran Prasilla Kumaran Center for Advanced Electrical and Electronic System Faculty of EngineeringBuilt Environment and Information TechnologySEGi UniversityPetaling JayaSelangor 47810Malaysia

This study proposes a solution for optimizing the distance between a solar module and reflector for an indoor energy harvesting *** is a process in which energy(ambient light)is captured and converted directly into *** a building,this energy could be used to supply power to wide range of portable equipment or offset other electrical energy usage and associated *** proposed reflector element was designed and tested in a real indoor environment to confirm its effectiveness.A distance⁃optimization method for the placement of a polycrystalline photovoltaic(PV)module and a mirror was described,and the performance characteristics of the system were investigated qualitatively through visual observation and quantitatively through measuring voltage and ampere *** solar PV system with a reflector element displayed a 10%increase in voltage when compared with that *** the distance between PV module and the reflector increased,the voltage and ampere reading decreased,thus the distance was optimized to gain maximum *** studies employing reflectors have also showed increases in voltage readings with different designs,suggesting that reflectors are economically viable optical elements that can boost the voltage output of a PV *** practice,the distance⁃optimized PV module can be placed in buildings with extended indoor lighting duration away from disrupting building activity.

关键词： photovoltaic module solar energy energy harvesting reflector

维普期刊数据库

energy harvesting for Self-Powered Nanosystems

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Nano Research 2008年第1期1卷 1-8页

作者： Zhong Lin Wang School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332-0245USA

In this article,an introduction is presented about the energy harvesting technologies that have potential for powering *** discussion mainly focuses on the approaches other than the well-known solar cell and *** mainly introduce the piezoelectric nanogenerators developed using aligned ZnO nanowire *** is a potential technology for converting mechanical movement energy(such as body movement,muscle stretching,blood pressure),vibration energy(such as acoustic/ultrasonic wave),and hydraulic energy(such as fl ow of body fl uid,blood fl ow,contraction of blood vessel,dynamic fl uid in nature)into electric energy for self-powered nanosystems.

关键词： Nanogenerator self-powered nanosystem energy harvesting

energy harvesting performance of viscoelastic polyacrylic dielectric elastomers

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International Journal of Smart and Nano Materials 2015年第3期6卷 162-170页

作者： Junshi Zhang Yongquan Wang Hualing Chen Bo Li State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong UniversityXi’an 710049China School of Aerospace Xi’an Jiaotong UniversityXi’an 710049China School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China

Viscoelasticity dissipates the mechanical energy,leading to a reduction of energy conversion efficiency in both dielectric elastomer(DE)actuators and *** measuring the uniaxial tension-recovery experiments of very-high-bond-based DE,this article quantitatively presents the effect of viscoelasticity on energy harvesting performance of DE *** employing a DE strip energy harvester with constant surface charge,an analytical model is established to calculate the generated electrical energy and energy conversion *** results demonstrate that viscoelasticity has a significant influence on DE energy harvesting performance.

关键词： dielectric elastomer viscoelasticity energy harvesting

Monolithic homogeneous integrated miniaturized triboelectric nanogenerator with an inner air cavity for energy harvesting

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Science China(Technological Sciences) 2021年第3期64卷 662-672页

作者： HOU XiaoJuan ZHANG ShengNan YU JunBin YANG ChangJun ZHANG Ning HE Jian CHOU XiuJian Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan 030051China

To realize the high-efficiency acquisition of environmental mechanical energy,traditional triboelectric nanogenerators(TENGs)based on contact-separation consist of two separate triboelectric *** large contact-separation gap increases the overall volume of the device,making it difficult to realize miniaturization and *** work,therefore,presents a fully enclosed all-in-one-shaped flexible TENG(FEAST)with an air cavity using rubber mixing and high-temperature *** air pressure inside the enclosed air cavity facilitates effective contact-separation of the *** homogeneous integration between the triboelectric layer and the electrode layer enhances structural firmness without using extra spacer *** developed FEAST presents excellent mechanical durability even after 10000 *** increasing the active contact area between the triboelectric materials,a maximum peak-peak output voltage,current,and power density of 130 V,1.1μA,and277 m W/m^(2),respectively,were obtained with an effective stress area of 1 ***,the fully enclosed structure ensures that the output performance is not affected by the external *** FEAST was fixed onto the sole of a shoe to demonstrate its applicability in harvesting mechanical energy from human ***,the developed method provides a simple approach for optimizing the structure of TENGs and is compatible with large-scale manufacturing.

关键词： triboelectric nanogenerator air cavity homogeneous integration all-in-one shape energy harvesting

维普期刊数据库

A unified approach of energy and data cooperation in energy harvesting WSNs

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Science China(Information Sciences) 2018年第8期61卷 170-182页

作者： Roomana YOUSAF Rizwan AHMAD Waqas AHMED Fu-chun ZHENG School of Electrical Engineering and Computer Science National University of Sciences and Technology Department of Electrical Engineering Pakistan Institute of Engineering and Applied Sciences School of Electronic and Information Engineering Harbin Institute of Technology

energy harvesting(EH) provisioned wireless sensor nodes are key enablers to increase network life time in modern wireless sensor networks(WSNs). However, the intermittent nature of the EH process necessitates management of nodes’ limited data and energy buffer capacity. In this paper, a unified mathematical model for a cooperative EHWSN with an opportunistic relay is presented. The energy and data causality constraints are expressed in terms of throughput, available energy, delay and transmission *** finite energy buffers, data buffers and discrete transmission rates(as defined in the standard IEEE 802.15.4) at the nodes, different intuitive online power allocation policies at the relay are *** results show that a policy achieving high throughput is less fair and vice versa. Therefore, a joint rate and power allocation policy(JRPAP) is proposed in this study which provides a better trade off between fairness, throughput and energy over intuitive policies. Based on the JRPAP results, we propose to use data aggregation(DA) to achieve throughput gain at lower buffer sizes. In addition, the notion of energy aggregation(EA) is introduced to achieve throughput gain at higher buffer sizes. Combining both EA and DA further improves the overall throughput at all buffer sizes.

关键词： energy harvesting energy causality data causality energy aggregation data aggregation opportunistic relay

Ionic thermal up-diffusion in nanofluidic salinity-gradient energy harvesting

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National Science Review 2019年第6期6卷 1266-1273页

作者： Rui Long Zhengfei Kuang Zhichun Liu Wei Liu School of energy and Power Engineering Huazhong University of Science and Technology

Advances in nanofabrication and materials science give a boost to the research in nanofluidic energy harvesting. Contrary to previous efforts on isothermal conditions, here a study on asymmetric temperature dependence in nanofluidic power generation is conducted. Results are somewhat counterintuitive. A negative temperature difference can significantly improve the membrane potential due to the impact of ionic thermal up-diffusion that promotes the selectivity and suppresses the ion-concentration polarization,especially at the low-concentration side, which results in dramatically enhanced electric power. A positive temperature difference lowers the membrane potential due to the impact of ionic thermal down-diffusion,although it promotes the diffusion current induced by decreased electrical resistance. Originating from the compromise of the temperature-impacted membrane potential and diffusion current, a positive temperature difference enhances the power at low transmembrane-concentration intensities and hinders the power for high transmembrane-concentration intensities. Based on the system's temperature response, we have proposed a simple and efficient way to fabricate tunable ionic voltage sources and enhance salinity-gradient energy conversion based on small nanoscale biochannels and mimetic nanochannels. These findings reveal the importance of a long-overlooked element—temperature—in nanofluidic energy harvesting and provide insights for the optimization and fabrication of high-performance nanofluidic power devices.

关键词： energy harvesting ionic thermal up-diffusion ionic voltage source nanofluidics

Effect of contact- and sliding-mode electrification on nanoscale charge transfer for energy harvesting

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Nano Research 2016年第12期9卷 3705-3713页

作者： Yu Sheng Zhou Shengming Li Simiao Niu Zhong Lin Wang School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332 USA Department of Mechanical Engineering Tsinghua University Beijing 100084 China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083 China

The process of charge transfer based on triboelectrification （TE） and contact electrification （CE） has been recently utilized as the basis for a new and promising energy harvesting technology, i.e., triboelectric nanogenerators, as well as self- powered sensors and systems. The electrostatic charge transfer between two surfaces can occur in both the TE and the CE modes depending on the involvement of relative sliding friction. Does the sliding behavior in TE induce any fundamental difference in the charge transfer from the CE？ Few studies are available on this comparison because of the challenges in ruling out the effect of the contact area using traditional macro-scale characterization methods. This paper provides the first study on the fundamental differences in CE and TE at the nanoscale based on scanning probe microscopic methods. A quantitative comparison of the two processes at equivalent contact time and force is provided, and the results suggest that the charge transfer from TE is much faster than that from CE, but the saturation value of the transferred charge density is the same. The measured frictional energy dissipation of -11 eV when the tip scans over distance of I A sheds light on a potential mechanism： The friction may facilitate the charge transfer process via electronic excitation. These results provide fundamental guidance for the selection of materials and device structures to enable the TE or the CE in different applications; the CE mode is favorable for frequent moderate contact such as vibration energy harvesting and the TE mode is favorable for instant movement such as harvesting of energy from human walking.

关键词： energy harvesting contact electrification triboelectrification charge transfer electronic excitation scanning Kelvin probemicroscopy