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Wei Lin, Richard W. Ziolkowski
Engineering 2022, Volume 11, Issue 4, Pages 42-59 doi: 10.1016/j.eng.2021.08.025
Far-field wireless power transfer (WPT) is a major breakthrough technology that will enable the many anticipated ubiquitous Internet of Things (IoT) applications associated with fifth generation (5G), sixth generation (6G), and beyond wireless ecosystems. Rectennas, which are the combination of rectifying circuits and antennas, are the most critical components in far-field WPT systems. However, compact application devices require even smaller integrated rectennas that simultaneously have large electromagnetic wave capture capabilities, high alternating current (AC)-to-direct current (DC) (AC-to-DC) conversion efficiencies, and facilitate a multifunctional wireless performance. This paper reviews various rectenna miniaturization techniques such as meandered planar inverted-F antenna (PIFA) rectennas; miniaturized monopole- and dipole-based rectennas; fractal loop and patch rectennas; dielectric-loaded rectennas; and electrically small near-field resonant parasitic rectennas. Their performance characteristics are summarized and then compared with our previously developed electrically small Huygens rectennas that are proven to be more suitable for IoT applications. They have been tailored, for example, to achieve battery-free IoT sensors as is demonstrated in this paper. Battery-free, wirelessly powered devices are smaller and lighter in weight in comparison to battery-powered devices. Moreover, they are environmentally friendly and, hence, have a significant societal benefit. A series of high-performance electrically small Huygens rectennas are presented including Huygens linearly-polarized (HLP) and circularly-polarized (HCP) rectennas; wirelessly powered IoT sensors based on these designs; and a dual-functional HLP rectenna and antenna system. Finally, two linear uniform HLP rectenna array systems are considered for significantly larger wireless power capture. Example arrays illustrate how they can be integrated advantageously with DC or radio frequency (RF) power-combining schemes for practical IoT applications.
Keywords: Cardioid pattern Electrically small antenna Huygens dipole antenna Internet of Things (IoT) Rectenna Rectifiercircuit Wireless power transfer
Self-catalytic pyrolysis thermodynamics of waste printed circuit boards with co-existing metals
Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 11, doi: 10.1007/s11783-022-1581-0
● The co-existing metals in WPCBs has positive catalytic influence in pyrolysis.
Keywords: Waste printed circuit board Catalyst Pyrolysis Kinetics
Non-toxic, high selectivity process for the extraction of precious metals from waste printed circuit
Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 10, doi: 10.1007/s11783-023-1723-z
● Au, Ag and Pd were recovered from WPCBs with high efficiencies.
Keywords: Thiosulfate Printed circuit boards Precious metals Leaching Hydrometallurgy
Research on the equivalent circuit parameter of single linear induction motor
Xu Wei,Sun Guangsheng
Strategic Study of CAE 2008, Volume 10, Issue 8, Pages 76-80
The SLIM parameter has clear error to its real value on the base of the RIM parameter measurement method because it has larger air gap and edge effect. This paper proposes a new scheme suited for SLIM parameter detection. It only needs input total power, phase voltage, phase current, frequency, and then computes primary resistance, primary leakage induction, secondary resistance, secondary leakage induction, air induction and iron loss resistance. The performance analysis of SLIM indicates that this method is very effective and valuable.
Keywords: single linear induction motor open-secondary circuit experiment blocked-secondary circuit experiment parameter measurement equivalent circuit
Hao WANG, Fengge ZHANG, Tao GUAN, Siyang YU
Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3, Pages 420-426 doi: 10.1007/s11465-017-0439-9
Keywords: wind power brushless electrically excited synchronous generator hybrid rotor equivalent circuit
Copper recovery from waste printed circuit boards concentrated metal scraps by electrolysis
Xiaonan Liu, Qiuxia Tan, Yungui Li, Zhonghui Xu, Mengjun Chen
Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 5, doi: 10.1007/s11783-017-0997-4
Keywords: Waste printed circuit boards (WPCBs) Copper Recovery rate Purity Electrolysis
Copper fractal growth during recycling from waste printed circuit boards by slurry electrolysis
Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 6, doi: 10.1007/s11783-021-1405-7
• Copper fractal growth was observed during WPCBs recycling by slurry electrolysis.
Keywords: Dendritic copper Fractal growth WPCBs Slurry electrolysis
Enhancement of open circuit voltage in organic solar cells by doping a fluorescent red dye
Qing LI, Junsheng YU, Yue ZANG, Nana WANG, Yadong JIANG
Frontiers in Energy 2012, Volume 6, Issue 2, Pages 179-183 doi: 10.1007/s11708-012-0177-y
Keywords: organic solar cells (OSCs) open circuit voltage fluorescent dye doping 4-(dicyanomethylene)-2-t-butyl
Zebing Wu, Wenyi Yuan, Jinhui Li, Xiaoyan Wang, Lili Liu, Jingwei Wang
Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 5, doi: 10.1007/s11783-017-0995-6
Keywords: Waste PCBs Precious metals Hydrometallurgy Recycling Leaching Recovery
Zilian QU,Yonggang MENG,Qian ZHAO
Frontiers of Mechanical Engineering 2015, Volume 10, Issue 1, Pages 1-6 doi: 10.1007/s11465-015-0325-2
Keywords: CMP eddy current multilayer wafer Cu interconnects equivalent unit
Research of an Improved Bridge Type Solid-state Current Limiter
Li Hongfeng,Jia Guixi,Qi Wei,Xu Wei
Strategic Study of CAE 2005, Volume 7, Issue 8, Pages 75-79
As the expanding of power system capacity, the technologies of short circuit current limiting in power
Keywords: short circuit current limiter novel bridge type circuit simulation based on Matlab/Simulink dynamic-mode
Ruixin Yang, Rui Xiong, Weixiang Shen, Xinfan Lin
Engineering 2021, Volume 7, Issue 3, Pages 395-405 doi: 10.1016/j.eng.2020.08.015
External short circuit (ESC) of lithium-ion batteries is one of the common and severe electrical failures
Keywords: Electric vehicles Battery safety External short circuit Temperature prediction Extreme learning machine
Solid-state transformer-based new traction drive system and control
Jianghua FENG, Jing SHANG, Zhixue ZHANG, Huadong LIU, Zihao HUANG
Frontiers of Mechanical Engineering 2018, Volume 13, Issue 3, Pages 411-426 doi: 10.1007/s11465-018-0467-0
A new type of traction drive system consisting of solid-state traction transformer (SSTT), inverter unit, auxiliary inverter, traction motor and other key components is built in order to suit the demand of developing the next-generation electric traction system which will be efficient and lightweight, with high power density. For the purpose of reducing system volume and weight and improving efficiency and grid-side power quality, an efficient SSTT optimized topology combining high-voltage cascaded rectifiers with high-power high-frequency LLC resonant converter is proposed. On this basis, an integrated control strategy built upon synchronous rotating reference frame is presented to achieve unified control over fundamental active, reactive and harmonic components. The carrier-interleaving phase shift modulation strategy is proposed to improve the harmonic performance of cascaded rectifiers. In view of the secondary pulsating existing in a single-phase system, the mathematical model of secondary power transfer is built, and the mechanism of pulsating voltage resulting in beat frequency of LLC resonant converter is revealed, so as to design optimum matching of system parameters. Simulation and experimental results have verified that the traction system and control scheme mentioned in this paper are reasonable and superior and that they meet the future application requirements for rail transit.
Keywords: solid-state traction transformer high-voltage cascaded rectifier LLC resonant converter synchronous rotating
Analytical model and finite element computation of braking torque in electromagnetic retarder
Lezhi YE,Guangzhao YANG,Desheng LI
Frontiers of Mechanical Engineering 2014, Volume 9, Issue 4, Pages 368-379 doi: 10.1007/s11465-014-0314-x
An analytical model has been developed for analyzing the braking torque in electromagnetic retarder by flux tube and armature reaction method. The magnetic field distribution in air gap, the eddy current induced in the rotor and the braking torque are calculated by the developed model. Two-dimensional and three-dimensional finite element models for retarder have also been developed. Results from the analytical model are compared with those from finite element models. The validity of these three models is checked by the comparison of the theoretical predictions and the measurements from an experimental prototype. The influencing factors of braking torque have been studied.
Keywords: electromagnetic retarder magnetic field distribution magnetic circuit finite element method
Thoughts on China’s Integrated Circuit Chip Manufacturing in the Post-Moore Era
Hanming Wu, Feijun Zheng
Engineering 2023, Volume 23, Issue 4, Pages 33-39 doi: 10.1016/j.eng.2022.07.021
Title Author Date Type Operation
High Performance Electrically Small Huygens Rectennas Enable Wirelessly Powered Internet of Things Sensing Applications: A Review
Wei Lin, Richard W. Ziolkowski
Journal Article
Self-catalytic pyrolysis thermodynamics of waste printed circuit boards with co-existing metals
Journal Article
Non-toxic, high selectivity process for the extraction of precious metals from waste printed circuit
Journal Article
Research on the equivalent circuit parameter of single linear induction motor
Xu Wei,Sun Guangsheng
Journal Article
Equivalent circuit and characteristic simulation of a brushless electrically excited synchronous wind
Hao WANG, Fengge ZHANG, Tao GUAN, Siyang YU
Journal Article
Copper recovery from waste printed circuit boards concentrated metal scraps by electrolysis
Xiaonan Liu, Qiuxia Tan, Yungui Li, Zhonghui Xu, Mengjun Chen
Journal Article
Copper fractal growth during recycling from waste printed circuit boards by slurry electrolysis
Journal Article
Enhancement of open circuit voltage in organic solar cells by doping a fluorescent red dye
Qing LI, Junsheng YU, Yue ZANG, Nana WANG, Yadong JIANG
Journal Article
A critical review on the recycling of copper and precious metals from waste printed circuit boards using
Zebing Wu, Wenyi Yuan, Jinhui Li, Xiaoyan Wang, Lili Liu, Jingwei Wang
Journal Article
current measurement of the thickness of top Cu film of the multilayer interconnects in the integrated circuit
Zilian QU,Yonggang MENG,Qian ZHAO
Journal Article
Research of an Improved Bridge Type Solid-state Current Limiter
Li Hongfeng,Jia Guixi,Qi Wei,Xu Wei
Journal Article
Learning Machine-Based Thermal Model for Lithium-Ion Batteries of Electric Vehicles under External Short Circuit
Ruixin Yang, Rui Xiong, Weixiang Shen, Xinfan Lin
Journal Article
Solid-state transformer-based new traction drive system and control
Jianghua FENG, Jing SHANG, Zhixue ZHANG, Huadong LIU, Zihao HUANG
Journal Article
Analytical model and finite element computation of braking torque in electromagnetic retarder
Lezhi YE,Guangzhao YANG,Desheng LI
Journal Article