Article
Chemistry, Analytical
Leon E. Niezen, Tijmen S. Bos, Peter J. Schoenmakers, Govert W. Somsen, Bob W. J. Pirok
Summary: The time required for method development in gradient-elution LC can be reduced by using empirical modelling to describe analyte retention and peak width. However, accurate prediction is hindered by system-induced gradient deformation, which needs to be corrected for optimization and method transfer. Capacitively coupled contactless conductivity detection (C4D) can measure the exact gradient profiles, improving the transferability of retention models.
ANALYTICA CHIMICA ACTA
(2023)
Article
Chemistry, Analytical
Jianjiao Wang, Yaping Liu, Wenhe He, Yuanfen Chen, Hui You
Summary: This article proposes a novel design of a planar grounded capacitively coupled contactless conductivity detector (PG-C4D) based on a printed circuit board (PCB) to reduce the effect of stray capacitance. The effectiveness of the design has been verified through electrical field simulation and electrophoresis detection experiments. The PG-C4D with this new design shows improved sensitivity and repeatability, making it suitable for applications in agricultural and environmental monitoring.
Article
Engineering, Electrical & Electronic
Jia-You Lee, Chih-Yi Liao, Shih-Yang Yin, Kuo-Yuan Lo
Summary: In this brief, a multilevel inverter (MLI) without the resonant circuit tuning is proposed for the contactless power transfer (CPT) system, which can generate a high-frequency ac voltage with an approximated sinusoidal envelope for the primary coil. Low-order harmonics can be eliminated by selecting an appropriate input voltage ratio and switching angles for the switches, and the cancelation of multiple harmonics can be achieved by designing multilevel circuits. The advantages of the proposed MLI include the reduction in low-order harmonics, low voltage stress, and high reliability, as verified by hardware experimental results in a CPT system prototype.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2021)
Article
Energy & Fuels
Maopeng Wu, Lijuan Su, Xiyou Chen, Xiaoli Duan, Donghua Wu, Yu Jiang
Summary: Ultrasonic contactless power transfer technology is a new type of power transfer that can transfer power to loads in enclosed metal containers without contact. This paper proposes a system that uses a single transducer to transfer power and data in different directions simultaneously, and analyzes its power transfer and data backward transfer channels. Experimental results show that the system achieves high output power and data transfer rate under ideal conditions.
Article
Chemistry, Analytical
Ruihua Zhang, Qiang Zhang, Zehua Guo, Yiren Cao, Jun Cao, Xiaoping Liu, Chengxi Cao
Summary: To address the issue of dependence on indicators in electrophoresis titration visualization and achieve rapid quantitative detection of protein content, an electrophoresis titration sensor with capacitively coupled contactless conductivity detection (ET-C4D) model and theory were proposed. Numerical simulation, gel systems verification, and protein content analysis of dairy products were performed to validate the model and theory. The ET-C4D showed good applicability in the analysis of dairy product content and quantitative analysis of biosamples, providing facile and rapid quantitative detection with a fair linear range and good sensitivity.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Analytical
Chunqiong Hu, Bo Xie, Hongmei Li, Dan Xiao
Summary: This study introduces a five-electrode capacitively coupled contactless conductivity detector (TICD-D-4) with a copper mesh shield to reduce interference. The addition of the shield increases the difference value between response signal and baseline for 10(-9) M KCl solution. The detector also shows a higher slope and achieves a lower limit of detection when compared to conventional detectors. Furthermore, combining two TICD-D-4 detectors creates a dual-channel six-input differential capacitively coupled contactless conductivity detector (SIDCD-D-4) which further improves detection performance.
ANALYTICAL METHODS
(2023)
Article
Physics, Applied
Arsad Quraishi, Igal Kronhaus
Summary: Computational fluid dynamics simulations were used to study the discharge of a capillary capacitively coupled radio frequency thruster with a front powered electrode. The results showed good agreement with experimental data, and the spatial characteristics of the discharge were analyzed, revealing that the thrust is completely attributed to gas dynamic acceleration.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Analytical
Hongyu Nie, Zhihui Li, Xiaokun Wang, Rongmeng Gu, Hongyan Yuan, Yong Guo, Dan Xiao
Summary: In this study, a multi-input capacitively coupled contactless conductivity detector (MICD)-D-4 was proposed with high sensitivity, and further improved by combining it with differential detection to form (DFMICD)-D-4. The new detector showed improved performance compared to traditional single-input and double-input detectors, with a higher response-to-baseline ratio and a low limit of detection (0.7 nM). It can be applied to the detection of low-conductivity solutions and total dissolved solids (TDS) analysis, demonstrating its versatility and superiority over standard conductivity meters.
Article
Chemistry, Analytical
Yuchen He, Qiang Huang, Yu He, Haifeng Ji, Tao Zhang, Baoliang Wang, Zhiyao Huang
Summary: The new (CD)-D-4 sensor developed in this work utilizes an LC circuit to lower the working frequency for conductivity measurement, leading to improved detection limits. Experimental results demonstrate good linearity for concentration measurement of SO42- and Li+ ions at low concentrations, with LODs estimated to be 8.2 and 19.0 µM, respectively.
Article
Biochemical Research Methods
Brenda M. C. Costa, Aline G. Coelho, Michael J. Beauchamp, Jacob B. Nielsen, Gregory P. Nordin, Adam T. Woolley, Jose A. F. da Silva
Summary: This work demonstrates the design and fabrication of microchip electrophoresis devices containing cross-shaped channels and spiral electrodes, which were prepared using a 3D printer with high resolution. The device was successfully applied for the separation of sodium, potassium, and lithium cations using microchip electrophoresis.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Engineering, Electrical & Electronic
Juan Carlos Rodriguez, Felipe Grijalva
Summary: This article introduces the application of capacitive coupling in auxiliary power supplies. A novel mathematical model is proposed to describe high-frequency switching DC-DC regulation, and its advantages are demonstrated through a case study.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Review
Chemistry, Analytical
Abdalla Ahmed Elbashir, Rafea Elamin Elgack Elgorashe, Ahmed O. Alnajjar, Hassan Y. Aboul-Enein
Summary: This review provides an update on the new applications of capacitively coupled contactless conductivity detection (CD-4) in the field of pharmaceutical, food and biomedical analysis. The utilization of CD-4 in capillary electrophoresis methods for detecting analytes is discussed, and concluding remarks and outlooks are provided.
CRITICAL REVIEWS IN ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Yineng Wang, Xi Cao, Walter Messina, Anna Hogan, Justina Ugwah, Hanan Alatawi, Ed van Zalen, Eric Moore
Summary: Capillary electrochromatography (CEC) combines liquid chromatography (LC) and capillary electrophoresis (CE), providing rapid separations, high efficiency, and high selectivity. The use of capacitively coupled contactless conductivity detection (CD-D-4) allows for contactless electrode configuration, preventing contamination.
Article
Engineering, Electrical & Electronic
Hany A. Atallah
Summary: This paper presents and studies a noteworthy compact dual-band wireless power transfer (DB-WPT) system. The proposed system uses a capacitively loaded interdigital capacitor to achieve high transmission efficiency. The system's operation is verified through fabrication, showing high coupling efficiencies at different frequencies. This design is suitable for compact near-field wireless power transfer applications.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Computer Science, Information Systems
Seyed Mahdi Hosseini, Zahra Atlasbaf
Summary: This study investigates the concept of connected and capacitively coupled dipoles in a planar array to improve wideband performance. The results show that the impedance mismatch of a connected/capacitively coupled dipole array is smaller than that of an array of unconnected dipoles, and capacitive coupling performs better than a direct connection. This is significant for the design of wideband array antennas.
Article
Engineering, Multidisciplinary
Kehan Zhang, Pengxin Zhang, He Du, Zhengchao Yan, Baowei Song, Aiguo Patrick Hu
Summary: This article proposes a mu-controller based on the structured singular value to achieve constant current charging in inductive power transfer systems. The controller ensures robust operations and can handle the uncertainty of multiple parameter perturbations and external disturbances. Simulation and experimental results demonstrate the strong robustness of the proposed control method against load and frequency perturbation.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Bo Luo, Aiguo Patrick Hu, Hira Munir, Qi Zhu, Ruikun Mai, Zhengyou He
Summary: This article proposes a compensation design method to achieve maximum power transfer in a CPT system under coupling voltage constraints. It introduces a family of compensation topologies to maintain a 90 degrees phase shift between the input and output voltages, allowing full utilization of coupling voltages for power transfer. Experimental results show good agreement with theoretical analysis, achieving a maximum power transfer of 2.039 kW under given voltage limits and coupling conditions.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Dai Bui, Qi Zhu, Lei Zhao, Aiguo Patrick Hu
Summary: This article proposes an IPT system with a dual-concentric-coil transmitting and single-coil receiving coupling configuration with hybrid tuning networks. The system shows stable output voltage characteristics under varying coupling and load variations.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Wei Zhou, Qiao Gao, Ruikun Mai, Zhengyou He, Aiguo Patrick Hu
Summary: This article proposes a capacitive power transfer (CPT) system that can be extended by a modularized approach with multiple electric field couplers. It studies a dual-input dual-output (DIDO) system with four pairs of coupling plates and analyzes the effect of mutual capacitances on the system resonance. By designing a decoupling circuit and compensation network, the system is extended by doubling the single-input single-output couplers. Experimental results show that the output power of the system is effectively increased.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Bo Long, Qi Zhu, Shaoge Zang, Lei Zhao, Aiguo Patrick Hu
Summary: This letter proposes a method for detecting metal objects by monitoring the fifth-order harmonic current, and a dual-frequency tuning configuration is designed for efficient detection of metal objects.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Shichao Zhang, You Wu, Feng Gao, Huiming Shang, Jia Zhang, Zhonghua Li, YongQing Fu, PingAn Hu
Summary: This study presents a new strategy to improve the performance of 2D material-based devices by combining metallic and semiconducting polymorphs of transition-metal dichalcogenides. The phase engineering method successfully achieves heterophase-based FETs with low contact resistance, which are used for detecting NH3 gas concentration.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Automation & Control Systems
Zhou Yan, Chongyuan Ma, Zijian Zhang, Liang Huang, Patrick Aiguo Hu
Summary: This study proposes an ideal simultaneous wireless power and information transfer system and addresses the impact of communication on energy transfer by redefining bandwidths. The experimental results demonstrate a good tradeoff between efficiency and data transfer rate in the proposed system.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Xin Liu, Nirmal Kumar C. Nair
Summary: An enhanced version of the Morlet wavelet-based two-point FIR (MW-FIR) method is proposed to improve immunity against disturbing signals. The estimators are tested and compared with other methods, showing significant improvements in most circumstances, particularly under challenging tests.
IEEE TRANSACTIONS ON SMART GRID
(2022)
Article
Chemistry, Physical
Huiming Shang, Feng Gao, Mingjin Dai, YunXia Hu, Shuai Wang, Bo Xu, Peng Wang, Bo Gao, Jia Zhang, PingAn Hu
Summary: A self-powered photodetector with light-induced electric field enhancement based on a 2D InSe/WSe2/SnS2 van der Waals heterojunction is designed, which achieves high responsivity and fast response speed by utilizing the light-induced electric field.
Article
Engineering, Electrical & Electronic
Kehan Zhang, Fan Dai, Xinyang Li, Zhengchao Yan, Fubin Zhang, Zhaoyong Mao, Aiguo Patrick Hu
Summary: This article explores the working principle of the inductive power transfer (IPT) system by examining the distribution of the electromagnetic field. The research proves that the IPT system operates in the near field, where the magnetic field energy density is much stronger than the electric field. Thus, the power analysis of the IPT system only needs to consider the magnetic field. The mutual inductance model is an approximation of the electromagnetic field model, and the complex form of the Poynting vector is integrated to analyze the power transfer characteristics. The study shows that when the system is in full resonance, only active power is transferred without reactive power, which aligns with the circuit model results. This article provides valuable insights into the power flow and energy distribution of the IPT system.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2023)
Article
Engineering, Electrical & Electronic
Wenjing Xiong, Qihui Yu, Zixi Liu, Qi Zhu, Mei Su, Lei Zhao, Aiguo Patrick Hu
Summary: This letter proposes a dual-frequency-detuning method for wireless power transfer systems to achieve a smooth power profile in large coupling variation ranges. By exploring the application of this method in a dual-frequency resonant network, the equivalent impedance of each frequency channel can be adjusted at different coupling conditions, allowing for free regulation of voltage gain and output power curves, even under high-order harmonic components of square-wave voltage excitation. A 130 W prototype is developed, and experimental results show that the maximum power fluctuation is less than 6.8% against coupling coefficient variations from 0.35 to 0.74.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Zixi Liu, Mei Su, Qi Zhu, Yuqian Chao, Shaoge Zang, Aiguo Patrick Hu
Summary: This article proposes a dual-frequency 3-D wireless power transfer system that can simultaneously drive two separate loads with independent voltage regulation. By utilizing dual-frequency excitations, the system forms two directional magnetic fields, enabling direct power transfer to the receiver tuned at the corresponding frequency. Through a dual-frequency resonant network, current control at each frequency channel is realized without cross-interference, allowing efficient power transfer to the two loads. A proof-of-concept prototype has been built, demonstrating its capability to transfer power to different positions with an overall system efficiency of about 72%.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Hongying Yang, Yunxia Hu, Xin Zhang, Yanan Ding, Shuai Wang, Zhen Su, Yong Shuai, Pingan Hu
Summary: A two-terminal NIR synaptic device based on a multilayer MoSe2 moiré superlattice is reported in this study, demonstrating strong sensing and storage functions similar to the human visual system. The interlayer coupling of multilayer MoSe2 is significantly enhanced by the moiré structure, enabling NIR light response and absorption. This research opens up new possibilities for the realization of NIR artificial retina and bionic eye based on 2D materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Xiaofei Li, Cheng Wang, Heshou Wang, Xin Dai, Yue Sun, Aiguo Patrick Hu
Summary: This article proposes a robust wireless power transfer system for static charging of automatic-guided vehicles (AGVs), which has self-alignment capability and controllable output current characteristics. A reconfigurable circuitry is designed to achieve magnetic field self-alignment and wireless charging. No additional components are needed for self-alignment. The induced voltage on the load side is used to automatically adjust the position of the AGV.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Computer Science, Cybernetics
Xiaokang Zhou, Xiaozhou Ye, Kevin I-Kai Wang, Wei Liang, Nirmal Kumar C. Nair, Shohei Shimizu, Zheng Yan, Qun Jin
Summary: This article proposes a clustering-based approach to select suitable participants and perform hierarchical federated learning in edge computing environment, improving the performance and efficiency of federated learning in Internet of Medical Things (IoMT) applications.
IEEE TRANSACTIONS ON COMPUTATIONAL SOCIAL SYSTEMS
(2023)
