Results 41 to 50 of about 58,117 (278)

RF power saving system for smart homes

Heliyon
In this work the investigation results of harvesting the RF energy of a 2.4 GHz Wi-Fi signal for supply of smart home leak sensors network are presented. The collected RF energy has been used as an additional source to power the sensors. The main goal of
Martynas Sapurov, Algirdas Baskys, Kazimieras Slivka, Vytautas Bleizgys, Karolis Stasys, Rimantas Simniskis, Valerijus Zlosnikas, Kęstutis Urbonas, Aldas Dervinis, Sarunas Paulikas, Nerijus Paulauskas, Raimondas Pomarnacki, Darius Gursnys, Leslav Mazeiko, Violeta Cymliakova, Pavel Piatrou, Justas Dilys   +16 more
doaj   +1 more source

Energy-Efficient Antenna Selection and Power Allocation for Large-Scale Multiple Antenna Systems with Hybrid Energy Supply [PDF]

, 2014
The combination of energy harvesting and large-scale multiple antenna technologies provides a promising solution for improving the energy efficiency (EE) by exploiting renewable energy sources and reducing the transmission power per user and per antenna.
Gong, Jie, Niu, Zhisheng, Zhou, Sheng, Zhou, Zhenyu   +3 more
core   +1 more source

Radio Frequency Energy Harvesting Technologies: A Comprehensive Review on Designing, Methodologies, and Potential Applications

Sensors, 2022
Radio frequency energy harvesting (RF-EH) is a potential technology via the generation of electromagnetic waves. This advanced technology offers the supply of wireless power that is applicable for battery-free devices, which makes it a prospective ...
Husam Hamid Ibrahim, Mandeep Jit Singh, Samir Salem Al-Bawri, Sura Khalil Ibrahim, Mohammad Tariqul Islam, Ahmed Alzamil, Md Shabiul Islam   +6 more
doaj   +1 more source

Design and investigation of small-scale long-distance RF energy harvesting system for wireless charging using CNN, LSTM, and reinforcement learning

Frontiers in Physics
Introduction: The energy supply challenge in wireless charging applications is currently a significant research problem. To address this issue, this study introduces a novel small-scale long-distance radio frequency (RF) energy harvesting system that ...
Hao Zhang, Yue Wang, Hyeong Kwang Benno Park, Tae Hyun Sung   +3 more
doaj   +1 more source

Upconversion Nanoparticles Embedded Photonic Contact Lens for Transepithelial Corneal Crosslinking Using Hyaluronate – Riboflavin Conjugate

Advanced Functional Materials, EarlyView.
A minimally invasive, transepithelial corneal cross‐linking (TE‐CXL) approach is presented using upconversion nanoparticles (UCNPs)‐loaded contact lenses (UCLs), after topical delivery of hyaluronate–riboflavin conjugates. The NIR‐to‐UV/blue light conversion by UCNPs in a UCL can activate riboflavin for TE‐CXL, resulting in the biomechanical strength ...
Gibum Lee, Inhoo Choi, Anara Molkenova, Yengwoo Son, Seungmin Yang, Mina Kwon, Tae‐Im Kim, Ki Su Kim, Sei Kwang Hahn   +8 more
wiley   +1 more source

Trading Wireless Information and Power Transfer: Relay Selection to Minimize the Outage Probability

, 2014
This paper studies the outage probability minimization problem for a multiple relay network with energy harvesting constraints. The relays are hybrid nodes used for simultaneous wireless information and power transfer from the source radio frequency (RF)
Butt, M. Majid, Guizani, Mohsen, Mohamed, Amr, Nasir, Adnan   +3 more
core   +1 more source

Ambient RF Energy Harvesting

RE&PQJ
In this paper, we present a study of ambient RF energy harvesting techniques. The measurement of the ambient RF power density is presented. The average of the density in broadband (1GHz- 3.5GHz) is in the order of -12dBm/m² (63µW/m²). Two systems have been studied to recover the RF energy.
null D. BOUCHOUICHA, null F. DUPONT, null M. LATRACH, null L.VENTURA   +3 more
openaire   +1 more source

Spectrally Tunable 2D Material‐Based Infrared Photodetectors for Intelligent Optoelectronics

Advanced Functional Materials, EarlyView.
Intelligent optoelectronics through spectral engineering of 2D material‐based infrared photodetectors. Abstract The evolution of intelligent optoelectronic systems is driven by artificial intelligence (AI). However, their practical realization hinges on the ability to dynamically capture and process optical signals across a broad infrared (IR) spectrum.
Junheon Ha, Yingshan Ma, Yong Nam An, Sung‐Un An, Hyeon Hak Jung, Suvi‐Tuuli Varjamo, Jiwon Yoo, Junho Min, Hanvit Kim, Faisal Ahmed, Sang Hoon Chae, Young Min Song, Weiwei Cai, Tawfique Hasan, Zhipei Sun, Dong‐Ho Kang, Hyeon‐Jin Shin, Yunyun Dai, Hoon Hahn Yoon   +18 more
wiley   +1 more source

Availability of Ambient RF Energy in d-Dimensional Wireless Networks

Energies, 2018
Radio frequency (RF) enabled energy harvesting has garnered increasingly broad applications in energy-constrained wireless networks. In this context, the actual available energy is constrained by the harvesting threshold of RF harvesters.
Hongxing Xia, Yongzhao Li, Hailin Zhang, Balasubramaniam Natarajan   +3 more
doaj   +1 more source

Photo‐Switching Thermal and Lithium‐Ion Conductivity in Azobenzene Polymers

Advanced Functional Materials, EarlyView.
Light‐responsive azobenzene polymers control thermal and ionic transport simultaneously through structural transitions. UV illumination disrupts π–π stacking, converting crystalline trans states to amorphous cis configurations. Thermal conductivity drops from 0.45 to 0.15 W·m−1·K−1 while Li+ diffusivity increases 100 fold. This dual transport switching
Jaeuk Sung, Jungwoo Shin, Qiujie Zhao, Minjee Kang, Christopher Evans, Cecilia Leal, Paul V. Braun, David G. Cahill   +7 more
wiley   +1 more source