- 标题
- 摘要
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- 实验方案
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Plasmonic hotspot in toroidal metamaterial
摘要： Toroidal dipole resonance under a normal incident excitation can be realized by designing a metallic circular groove with a depth asymmetry. Due to its specific radial charge current configuration, charges gather together on the central circular platform and form a plasmonic hotspot, covering a large circular region with a diameter of 200 nm, where E-field magnitude attains 34-time enhancement than that of the incident light, providing more potentials for energy harvesting or nanoparticle trapping, manipulating of light-matter interaction, and optical data storage.
关键词： toroidal dipole resonance,Plasmonic hotspot,energy harvesting,nanoparticle trapping,light-matter interaction,optical data storage,toroidal metamaterial
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - A CMOS-Based Energy Harvesting Approach for Laterally-Arrayed Multi-Bandgap Concentrated Photovoltaic Systems
摘要： This paper presents an energy harvesting approach for a concentrated photovoltaics (CPV) system based on cell-block-level integrated CMOS converters. The CPV system, built upon the Laterally-Arrayed Multi-Bandgap (LAMB) cell structure, is a potentially higher-efficiency and lower-cost alternative to traditional tandem-based systems. The cells within a sub-module block are connected for approximate voltage matching, and a CMOS-based multi-input single-output converter harvests and combines the energy while performing maximum power point tracking (MPPT) locally. First, a comparison of modeled performances achievable with traditional tandem CPV and LAMB CPV with a MISO converter is presented using day-long outdoor measured solar spectrum. The model predicts on average >19% more energy can be extracted from LAMB modules on a typical day. Then, a prototype miniaturized MISO dc-dc converter operating at 10MHz is developed in a 130nm CMOS process. For 45-160mW power levels, the prototype converter achieves >92% nominal and >95% peak efficiency in a small form factor designed to fit within available space in a LAMB PV cell block. The results demonstrate the potential of the LAMB CPV architecture for enhanced solar energy capture.
关键词： energy harvesting,maximum power point tracking,concentrated photovoltaic systems,CMOS,MISO dc-dc converter,DC-DC power converters
更新于2025-09-11 14:15:04
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Simultaneously and Synergistically Harvest Energy from the Sun and Outer Space
摘要： The sun and outer space are the two most important fundamental thermodynamics resources for human beings on Earth. The capability for harvesting solar energy has been of central importance throughout the history of human civilization. Harvesting the coldness of outer space using radiative cooling technology also has a long history and has received renewed interest recently. However, simultaneously and synergistically harvesting energy from these two thermodynamics resources has never been realized. Here we report the first experimental demonstration of such simultaneous energy harvesting using a configuration where a solar absorber that is transparent in mid-infrared is placed above a radiative cooler. The solar absorber is heated to 24°C above the ambient temperature and provides a shading mechanism that enables the radiative cooler to reach 29°C below the ambient temperature. This work points to a new avenue for harvesting of renewable energy resources.
关键词： thermodynamics,renewable energy,energy harvesting,solar energy,radiative cooling
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE 23rd International Conference on Emerging Technologies and Factory Automation (ETFA) - Torino, Italy (2018.9.4-2018.9.7)] 2018 IEEE 23rd International Conference on Emerging Technologies and Factory Automation (ETFA) - An Energy Measurement System for Characterization of Energy Harvesting Systems
摘要： Energy neutral computing is seen as a design approach for wireless sensor nodes (WSN) which are powered by energy harvesters. The approach relies on keeping an equilibrium between consumption and harvesting of energy and typically uses models for energy prediction and management. To adapt models to specific systems and environments, often characterization measurements are used. Measurements strongly influence the model quality and with this the usability of such WSN. In this paper a novel measurement system (PiEMS) is presented that outperforms existing approaches and helps to optimize typical characterization tasks. The increased accuracy of characterization and modeling are exemplified for different WSN applications.
关键词： Wireless sensor node (WSN),Characterization,Energy harvesting,Energy neutral computing,Current measurement,Low power measurement,Energy measurement system
更新于2025-09-10 09:29:36
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[IEEE 2018 Global Internet of Things Summit (GIoTS) - Bilbao, Spain (2018.6.4-2018.6.7)] 2018 Global Internet of Things Summit (GIoTS) - Lighting IoT Test Environment (LITE) Platform: Evaluating Light-Powered, Energy HarvestingEmbedded Systems
摘要： As interest in the Internet of Things (IoT) grows, so does the requirement for distributed sensing, computation, and communication. Some projections reach a scale of over a trillion wireless devices, which creates a battery replacement challenge that is unsustainable for both human resources (replacement effort) and the environment (disposal). One ?eld of research that strives to meet this challenge is energy harvesting (EH) for self-powered systems. Photovoltaic (PV) cells enable EH capabilities and provide high energy density. They are also typically inexpensive, often making them the transducer of choice for self-powered systems. However, the performance of these EH nodes is rarely evaluated under realistic IoT environmental conditions, such as variable indoor lighting. Under low light, PV cells draw very little power and could place the self-powered system in a standby or even nonfunctional state. Most evaluations of EH systems in various lighting environments use software simulations to predict the behaviour of these nodes, but approximate models lack the exactness required to help with veri?cation of hardware in real conditions. Another approach is user testing in the ?eld, but this arduous solution would incur a variety of costs. This paper presents a third alternative: the Lighting IoT Test Environment (LITE) platform. The LITE platform is a tool that provides insight on how light-powered EH systems operate in low lighting environments. The LITE platform is able to physically emulate a variety of indoor and outdoor lighting sources with a novel mapping technique and provide time-series, environmental simulation of that source on a device under test (DUT). The light source emulation and time-series simulation capabilities are characterized with a worst case mean absolute percentage error (MAPE) of 3.2% and MAPE of 0.5%, respectively. By enabling engineers to accurately understand how these self-powered systems work under real world conditions, the LITE platform will better equip them to design, debug, and distribute fully functional and sustainable IoT nodes.
关键词： internet of things,test platform,system on chip,embedded systems,photovoltaic,energy harvesting,veri?cation
更新于2025-09-10 09:29:36
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[Lecture Notes in Electrical Engineering] Engineering Vibration, Communication and Information Processing Volume 478 (ICoEVCI 2018, India) || Design of an Energy Harvesting System for Wireless Power Transmission Using Microstrip Antenna
摘要： Power supply drives technological devices. As the wired world looks long antiquated, it is imperative transition towards wireless power transmission (WPT). WPT has been lately enticing in a varying range of applications in numerous ?elds and has also become a very alluring area of research activity because of the potential it has in providing solutions to our daily requirement, so the need arises to delve into it to explore new, innovative and ef?cient means of energy transmission. WPT will be indispensable in the imminent future, as this technology assists in the transmission of electrical energy to any device from the power source using air as the transmission medium without the use of any conductors. In this paper, an energy harvesting device is proposed to convert ambient electromagnetic waves, predominantly from the 2.4 GHz ISM radio frequency (RF) channel into direct current (DC) electricity. A microstrip antenna is designed along with a booster circuit to help charge devices wirelessly. This novel technology could be used for charging phone batteries on-the-go, thereby eliminating the hassles of wired connections.
关键词： Rectenna,Wireless power transmission,Energy harvesting,Wireless charging,Microstrip patch antenna
更新于2025-09-10 09:29:36
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Finite Element Modellingand Simulations of Piezoelectric Actuators Responses with Uncertainty Quantification
摘要： Piezoelectric structures are widely used in engineering designs including sensors, actuators, and energy-harvesting devices. In this paper, we present the development of a three-dimensional finite element model for simulations of piezoelectric actuators and quantification of their responses under uncertain parameter inputs. The implementation of the finite element model is based on standard nodal approach extended for piezoelectric materials using three-dimensional tetrahedral and hexahedral elements. To account for electrical-mechanical coupling in piezoelectric materials, an additional degree of freedom for electrical potential is added to each node in those elements together with their usual mechanical displacement unknowns. The development was validated with analytical and experimental data for a range of problems from a single-layer piezoelectric beam to multiple layer beams in unimorph and bimorph arrangement. A more detailed analysis is conducted for a unimorph composite plate actuator with different design parameters. Uncertainty quantification was also performed to evaluate the sensitivity of the responses of the piezoelectric composite plate with an uncertain input of material properties. This sheds light on understanding the variations in reported responses of the device; at the same time, providing extra confidence to the numerical model.
关键词： finite element method,uncertainty quantification,piezoelectric materials,unimorph actuator,energy harvesting,PZT
更新于2025-09-10 09:29:36
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[Nanostructure Science and Technology] Nanowire Electronics || Nanowires for Triboelectric Nanogenerators
摘要： Currently, the personal portable electronics are powered by traditional batteries. However, as the electronic elements and power consumption increase, the power source has become an issue because it is impractical to frequently recharge or replace the batteries. Especially, for implanted and biomedical electronic systems, to replace the power sources is unrealistic. Moreover, list of the shortcomings of the conventional power sources includes not only the limited capacity but also environmental pollution and possible explosion and health hazards. Besides, the heavy and rigid boxy batteries hinder the further development of ?exible and wearable electronics and biomedical electronics. On the other way, most of the existing sensing technologies need to be pre-supported and pre-offered electrical or optical signals to sense environmental information, which inevitably requires foreign power sources. With the increased number and density of sensing networks, the sensors that can be of low-power consumption or even self-powered will be desired for future electronic modules [1–7]. TENG was ?rst invented by Zhong Lin Wang’s group in 2012 [8]. A more and deep study and discussion about TENGs can be found in another reference book [1]. Such devices utilize the conjunction of the triboelectri?cation and electrostatic induction to convert ubiquitous mechanical energy into electricity. The devices can act as ef?cient and sustainable energy converters and providers from harvesting environment low-frequency mechanical energy, such as wind, wave, river ?ow, rain drop, human body motions, and so forth [2–6, 9]. The collected energy can be converted to electric energy sources for continuously powering electronic devices and even systems [10]. Triboelectric effect is a contact-induced electri?cation in which a material turns into electrically charged after it is physically contacted with another different kind of materials. It is a natural phenomenon, and, probably, most of the people have been experiencing the triboelectric phenomena in our daily life. However, the mechanisms and availability of triboelectri?cation were seldom to be explored [11, 12].
关键词： Flexible Electronics,Nanowires,Triboelectric Nanogenerators,Energy Harvesting,Self-powered Sensors
更新于2025-09-10 09:29:36
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[IEEE 2018 International Conference on Smart Computing and Electronic Enterprise (ICSCEE) - Shah Alam, Malaysia (2018.7.11-2018.7.12)] 2018 International Conference on Smart Computing and Electronic Enterprise (ICSCEE) - Energy Harvesting For Efficient 5G Networks
摘要： The design of traditional mobile wireless network emphasises on large capacity as well as ubiquitous access. However, environmental protection and energy saving may soon become inevitable trends due to rising global demands. In the wireless networking field, researchers should shift their focus towards efficient networks and energy harvesting (EH). In this work, we consider energy efficiency and EH to address the issue of energy shortage, which also represents the ratio of the quantity of data that have been transferred to the dissipated energy within the system, simultaneously. The simulation-based mathematics signifies the relation between energy efficiency ((cid:2159)(cid:2161)(cid:4667) against the training interval ((cid:2176)(cid:2202)(cid:4667) and how the energy efficiency is impacted by the change in block size and number of users.
关键词： 5G,Wireless Communication,Resource Allocation,Energy Harvesting(EH),Information Decoding(ID),Green Transmission,Networking
更新于2025-09-10 09:29:36
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Exploiting Impacts of Intercell Interference on SWIPT-Assisted Non-Orthogonal Multiple Access
摘要： In this paper, we examine the influence of intercell interference (ICI) on the system outage behavior with important derived results in the proposed model of simultaneous wireless information and power transfer (SWIPT) together with the nonorthogonal multiple access (NOMA) using the amplify-and-forward protocol. We derive the closed-form expression of coverage probability for two NOMA users as a function of the signal-to-interference-plus-noise ratio (SINR). To fully take into account the effect of ICI, we adopt more practical parameters to evaluate the optimal power splitting coefficient regarding energy harvesting system performance analysis. Furthermore, to consider a more practical scenario, based on the fact that the number of ICI sources can affect wireless powered relays, we investigate the average outage probability by considering impacts of the reasonable number of participating ICI.
关键词： NOMA,outage probability,SWIPT,energy harvesting,intercell interference
更新于2025-09-10 09:29:36