Review
Chemistry, Physical
Yuan Meng, Junhong Pu, Qibing Peitz
Summary: Electrocaloric cooling technology has gained attention as an environmentally friendly and efficient alternative in the cooling community. However, the limited adiabatic temperature change of materials poses a challenge. Recent efforts have focused on designing electrocaloric cooling devices based on active heat regeneration and cascading approaches, showing promising results.
Article
Multidisciplinary Sciences
Xitao Liu, Zhenyue Wu, Tong Guan, Haidong Jiang, Peiqing Long, Xiaoqi Li, Chengmin Ji, Shuang Chen, Zhihua Sun, Junhua Luo
Summary: Most known electrocaloric materials exhibit poor cooling performance near room temperature, limiting their applications. The emerging family of hybrid perovskite ferroelectrics shows superior performance, offering an ideal platform for achieving room temperature solid-state refrigeration with large electrocaloric effects.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Farrukh Najmi, Wei Yi, Z. -y. Cheng
Summary: The development of electrocaloric materials with strong electrocaloric effect in recent years provides an opportunity for the development of solid-state heat pumps. By introducing a design that uses two layers of an ECM and independently controls the electric field on each layer, heat pumps with high cooling power can be developed. The new design shows improved reliability and performance compared to existing ECE-based heat pump systems.
Article
Engineering, Multidisciplinary
Xilong Kang, Shuhai Jia, Jun Peng, Hongqiang Yu, Xing Zhou
Summary: This research successfully achieved efficient electrocaloric cooling through the composite of ferroelectric materials and manufactured a high-performance EC cooling device. Compared with traditional fan cooling, EC cooling showed better performance in practical applications.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Thermodynamics
Qiang Li, Junye Shi, Donglin Han, Feihong Du, Jiangping Chen, Xiaoshi Qian
Summary: The study introduces a new concept design for an electrocaloric refrigeration device, utilizing a rotating design and heat transfer fluid as an intermediate medium to achieve more efficient cooling effects. Simulation and comparative research demonstrate that using deionized water as the heat transfer medium results in high cooling power density and COP values, indicating excellent refrigeration performance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Lucas Depreux, Morgan Almanza, Nouh Zeggai, Fabien Parrain, Martino LoBue
Summary: This paper investigates the limitations of electrocaloric cooling technology and proposes a model that takes these limitations into account. The results suggest that reducing air pressure can effectively reduce air losses, providing a promising solution for further improvement of the technology.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Junye Shi, Qiang Li, Tianyuan Gao, Donglin Han, Yuanyuan Li, Jiangping Chen, Xiaoshi Qian
Summary: Electrocaloric cooling technology has gained great attention in recent years, but practical applications require devices to achieve kilowatt level cooling power. Researchers have developed a rotary EC device and optimized its performance through numerical and parametric studies.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Physics, Applied
Xin Chen, Vladimir V. Shvartsman, Doru C. Lupascu, Q. M. Zhang
Summary: More than a decade of research has led to the development of EC materials that exhibit a giant electrocaloric effect at high electric fields and enables EC cooling devices. Electrical breakdown is a critical issue that needs to be addressed for reliable device operation. Advanced EC materials that generate large electrocaloric effect at low electric fields are required for competitive performance.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Acoustics
Ivan A. Starkov, Alexander S. Anokhin, Alexander S. Starkov
Summary: This study focuses on solving the heat equation to describe the electrocaloric effect in a ferroelectric layer and investigates the impact of pulse shape and frequency on heat flux and thermodynamic efficiency. The efficiency characteristics of rectangular and sinusoidal pulses at different frequencies vary significantly, with the maximum efficiency achieved by a sinusoidal pulse at 77.6 mHz being 0.74. The proposed new approach allows for improved cooling system optimization, and the concept of using changes in Biot number over time to model a heat switch is introduced.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2021)
Article
Physics, Applied
G. Taxil, M. Lallart, B. Ducharne, T. T. Nguyen, H. Kuwano, T. Ono, G. Sebald
Summary: The energy conversion potential of ferroelectric materials, specifically in temperature ranges and electric field values, is highly promising. Pyroelectric energy harvesting, which converts thermal energy directly into electrical energy, is most effectively achieved through the Olsen cycle. This study successfully modeled the Olsen cycle, simulating varying temperatures and electric field directions for different crystal orientations. The results confirmed the negative electrocaloric effect previously reported, and identified the phase transitions most suitable for pyroelectric energy harvesting applications, with an energy density in the order of 10(2) mJ/cm 3.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Energy & Fuels
Xin Chen, Wenyi Zhu, Alexander S. Rattner, Q. M. Zhang
Summary: Caloric cooling technologies, particularly those based on the electrocaloric (EC) effect, have the potential to be environmentally friendly and more efficient than current refrigeration systems. A self-actuated EC polymer heat pump is proposed, utilizing recent discoveries of giant EC and electromechanical responses in P(VDF-TrFE-CFE-FA) relaxor tetrapolymers. This concept enables highly efficient and compact EC heat pumps by autonomously achieving a large displacement between the heating and cooling cycles of the EC films.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Nanoscience & Nanotechnology
Abhisikta Barman, Subhashree Chatterjee, Canlin Ou, Yau Yau Tse, Niladri Banerjee, Sohini Kar-Narayan, Anuja Datta, Devajyoti Mukherjee
Summary: A large electrocaloric effect is achieved through a strain-engineered Ba0.85Ca0.15Ti0.9Zr0.1O3 (BCZT) thin film heterostructure, demonstrating a broad second-order phase transition and unprecedented adiabatic temperature change of up to 13.5 K at 430 K in the BCZT/LSMO heterostructure. These effects have the potential to enhance relative cooling powers.
Article
Polymer Science
Liqi Kang, Donglin Han, Liang Hong, Lirong Zheng, Xiaoshi Qian
Summary: The development of efficient cooling technologies, especially electrocaloric materials, is crucial for addressing global warming. Understanding the underlying mechanisms of electrocaloric effects is necessary for advancing their development. Previous studies estimated the maximum temperature change using a polarization model, but it is more relevant to assess the electrocaloric effect under continuously changing electric fields to simulate real-world conditions.
Article
Thermodynamics
MingJun Xu, JiaQing Zhang, RuiYu Chen
Summary: This study investigated the cooling effect and mechanisms of single droplet impacting on a heated solid surface by using two noncontact measurement techniques. Four typical impact regimes were observed and a comprehensive map based on non-dimensional analysis was built to describe the relationships among them. Empirical correlations were acquired to predict the non-dimensional maximum spreading diameter.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Physics, Applied
Chi Hou Lei, Yunya Liu
Summary: This study establishes the correlations between local electrocaloric responses and domains in ferroelectric crystals and investigates the local electrocaloric responses in different domain structures. The results reveal the characteristics of local electrocaloric responses in different domain walls and show good agreement between simulations and experimental measurements. Furthermore, increasing domain wall density can multiplicatively enhance the macroscopic average electrocaloric response in ferroelectrics.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Hao Pan, Dashi Lu, Lihua Zhu, Mingyu Li, Hongjun Ji
Summary: Thermal behavior and phase ratios optimization of Sn/Cu composite solders were studied. The results showed that increased solid-liquid contact area promoted the formation of IMC, resulting in decreased melting endothermic peak temperature of Sn and its enthalpy change. The in situ temperature rose with higher solid-liquid contact area during ultrasonic-assisted transient liquid phase. The phase ratio of residual Cu and Cu3Sn increased with decreasing solid-liquid contact area after U-TLP, while it increased with more initial Cu content.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Bo Wang, Mingyu Li, Yuxuan Liu, Xinyi Liang, Yang Yang, Xinzheng Lan, Liang Gao, Jianbing Zhang, Jiang Tang
Summary: Researchers have developed a new and simple synthesis method for highly monodisperse and halide passivated PbS quantum dots. This method improves the quality of quantum dots and enhances their optoelectronic properties.
Article
Engineering, Electrical & Electronic
Qingxin Sha, Min Li, Haifei Lv, Ming-Yu Li, Shuo Deng, Sisi Liu, Jiafu Wang, Xiaoyan Wen
Summary: A fiber curvature and angle sensor based on LP21 mode reflected by a fiber Bragg grating (FBG) inscribed in a four modes fiber (FMF) is developed. LP21-LP01 coupling is revealed to be more sensitive to fiber bending compared with LP11-LP01 and LP02-LP01 coupling. The sensor has potential application prospects in curvature and angle detection fields due to its simple structure, ease of fabrication, and reliable response performance.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Shuang Liu, Jingzhou Pang, Ruibin Gao, Tingting Yao, Tianfu Cai, Mingyu Li, Weimin Shi, Zhijiang Dai
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Engineering, Electrical & Electronic
Chunyu Hu, Rongxing Yang, Weimin Shi, Li Li, Ruibin Gao, Zhijiang Dai, Jingzhou Pang, Mingyu Li
Summary: This paper presents a complex combining method for designing wideband Outphasing power amplifiers (OPAs). The method uses complex combining impedance to compensate for the frequency dispersion of the active load modulation in the OPA, extending its bandwidth. It is illustrated for the first time that the load modulation trajectories of the OPA can be corrected over a wide bandwidth by designing the complex combining impedance.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Engineering, Electrical & Electronic
Yao Yao, Weimin Shi, Jingzhou Pang, Zhijiang Dai, Mingyu Li
Summary: This paper develops a simple dual-input dual-output (DIDO) Doherty power amplifier (DPA) that achieves flexible power transferring and enhanced efficiency by dynamically controlling the input amplitudes and phase difference of two sub-amplifiers. The fabricated DIDO-DPA operates at 2.4 GHz and delivers an output power of over 43.3 dBm, with a maximum drain efficiency (DE) of over 69.5% and a 6-dB back-off DE of over 58% at each output port.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Electrical & Electronic
Wenyi Jia, Zefan Feng, Tianfu Cai, Mingyu Li, Weimin Shi, Zhijiang Dai
Summary: In this paper, a robust constrained filtering algorithm called recursive constrained least arctangent (RCLA) adaptive algorithm is proposed. By introducing a novel cost function framework, the proposed RCLA algorithm shows superior convergence performance and better steady-state behavior against impulsive noises compared to other existing recursive methods. The mean square convergence analysis and theoretical transient mean square deviation (MSD) are derived in detail. Computer simulations are conducted to validate the theoretical analysis and verify the superior behavior of the proposed RCLA algorithm compared to known algorithms under non-Gaussian environments.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Electrical & Electronic
Jinting Liu, Weimin Shi, Linping Feng, Mingyu Li
Summary: This paper introduces the use of a dual-input technique to improve the conversion efficiency of a broadband Doherty power amplifier (DPA). By dynamically controlling the input power levels and phase difference between the carrier and peaking power amplifiers (PAs), the efficiency between the two peaks in the DPA is enhanced. Experimental results demonstrate the effectiveness of the fabricated dual-input DPA (DI-DPA) operating over the 1.1-2.2 GHz frequency range.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Chemistry, Analytical
Yi Jin, Zhijiang Dai, Xiongbo Ran, Changzhi Xu, Mingyu Li
Summary: This paper analyzes the load modulation process of a Doherty power amplifier (DPA) and presents a general formula for analyzing the load modulation of a peak PA matching network. It proposes a dual load-modulated DPA (D-DPA) design method to improve the power back-off efficiency of a DPA. Based on this method, a D-DPA operating at 2 GHz is designed and fabricated, showing improved efficiency in the back-off region.
Article
Chemistry, Analytical
Luqman Ali, Jie Wei, Fan-Yi Meng, Muhammad Waqas Qureshi, Kishor Kumar Adhikari, Ming-Yu Li, Jun-Ge Liang, Xiao-Long Wang, Xu-Min Ding, Nam-Young Kim, Cong Wang
Summary: This study demonstrates the noncontact immobilization of Ti3C2Tx MXene on a planar microwave resonator sensor using a polyimide film, leading to improved gas detection sensitivity for detecting acetone gas at the part per million -level. The sandwiching of a polyimide (PI) film between the resonator's interdigital capacitor structure and the MXene layer creates a strong electromagnetic field, allowing for significant interaction between acetone gas molecules and the resonator's EM field via the MXene layer. Compared to direct deposition of MXene on the resonator surface, the contactless immobilization of the MXene layer enhances acetone gas detection sensitivity by 110%. Two sensor prototypes were implemented, one with layers of PI film and MXene and the other with MXene only, and both exhibited linear correlation between resonant frequency and acetone gas concentration, high sensitivity (17.85 kHz/ppm), fast response time (60 s), and recovery time (85 s).
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Materials Science, Multidisciplinary
Sisi Liu, Meng Wang, Xiong Yu, Hao Li, Haifei Lu, Xiaoyan Wen, Ming-Yu Li, Jianbing Zhang
Summary: A hybrid electron transport layer (ETL) consisting of titanium-based nanomaterials and sol-gel zinc oxide (ZnO) is developed to enhance the infrared power conversion efficiency (PCE) of lead selenide (PbSe) quantum dot solar cells.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Zhijiang Dai, Shuman Kong, Mingyu Li, Tianfu Cai, Yi Jin, Changzhi Xu
Summary: A low-complexity Digital PreDistortion (DPD) method based on Improved Sparse Least Squares Twin Support Vector Regression (ISLSTSVR) modeling theory is proposed in this paper to tackle the resource consumption issue caused by the nonlinearity of the power amplifier in the RF front-end of high-capacity satellite communication. Experimental results show that this method can significantly reduce the coefficients and computational complexity of the DPD model while maintaining its accuracy, providing an effective idea and method for coefficient dimension reduction in the predistortion technology of spaceborne RF front-ends.
JOURNAL OF ELECTRONICS & INFORMATION TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Weiheng Jiang, Yaoxing Duan, Mingyu Li, Yi Jin, Changzhi Xu, Li Li
Summary: In traditional Digital PreDistortion (DPD) models, the same set of polynomial models and memory model are used to linearize the Power Amplifier (PA) at all input signal powers. However, different power levels exhibit different nonlinear characteristics and memory effects in PAs. To solve this problem, a DPD model based on the blind K-Nearest Neighbor (KNN) algorithm with dimension weighting is proposed. The proposed method is experimentally verified using a Doherty PA and a three carrier Long Term Evolution (LTE) signal.
JOURNAL OF ELECTRONICS & INFORMATION TECHNOLOGY
(2023)
Article
Computer Science, Information Systems
Guangwen Yang, Xinpeng Li, Jinting Liu, Xiaojuan Han, Hong Chang, Wei Zhang, Xinquan Yang, Mingyu Li
Summary: In this paper, the analysis and design method for the suboptimum Class-EM/F3 inverter with a duty ratio D =0.5 are presented. By introducing the new design parameter K, the suboptimum degree and the distance from the optimum condition can be defined. The proposed inverter offers lower peak switching voltage and higher efficiency compared to the conventional Class-E-M inverter.
Article
Engineering, Electrical & Electronic
Zixiong Li, Mingyu Li, Xinyi Hou, Lei Du, Lin Xiao, Tianshu Wang, Wanzhuo Ma
Summary: This paper proposes a mode-locked fiber laser based on graphene-coated microfiber. The total length of the fiber laser resonant cavity is 31.34 m. Dual-wavelength tuning is realized by adjusting the polarization controller (PC), and the wavelength tuning range is 11 nm. The effects of polarization states on bright-dark solitons are studied, and it is demonstrated that the mode-locking state can be switched between conventional solitons and bright-dark solitons in the graphene mode-locked fiber laser. Bright-dark soliton pairs with different shapes and nanosecond pulse width can be obtained by adjusting the PC and pump power.
FRONTIERS OF OPTOELECTRONICS
(2023)
