期刊：
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS,2025年362(1) ISSN：0016-0032
通讯作者：
Wang, H
作者机构：
[Nie, Liang] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Wang, Hui] Liaocheng Univ, Sch Math Sci, Liaocheng 252000, Peoples R China.;[Sun, Yichong] Chinese Univ Hong Kong, Multiscale Med Robot Ctr, Hong Kong 999077, Peoples R China.
通讯机构：
[Wang, H ] L;Liaocheng Univ, Sch Math Sci, Liaocheng 252000, Peoples R China.
摘要：
In this paper, a switched linear parameter-varying (LPV) resilient tracking controller is designed for rigid-body under actuator faults, uncertainties in measurement of scheduling parameters and time-delay in detection of system modes. The nonlinear attitude dynamics of rigid-body is constructed as a switched LPV system in which persistent dwell-time switching rule is used to regulate the switches caused by abrupt and intermittent actuator failures. Thereafter, by constructing a class of both parameter-dependent and time-dependent multiple Lyapunov functions (MLFs), a switched LPV resilient tracking controller is developed in order that the global uniform exponential stability and desired L infinity performance of the underlying system are achieved even with uncertain scheduling parameters, mismatched modes and persistent external disturbances. Furthermore, the nonconvex conditions of control synthesis are converted into parameterized linear matrix inequalities that can be readily resolved via gridding technique. Finally, the availability of the provided approach is evaluated with a numerical simulation.
摘要：
To improve the laser cleaning surface quality of rust layers in Q390 steel, a method of determining the optimal cleaning parameters is proposed that is based on response surface methodology and the second-generation non-dominated sorting genetic algorithm (NSGA-II). It involves constructing a mathematical model of the input variables (laser power, cleaning speed, scanning speed, and repetition frequency) and the objective values (surface oxygen content, rust layer removal rate, and surface roughness). The effects of the laser cleaning process parameters on the cleaning surface quality were analyzed in our study, and accordingly, NSGA-II was used to determine the optimal process parameters. The results indicate that the optimal process parameters are as follows: a laser power of 44.99 W, cleaning speed of 174.01 mm/min, scanning speed of 3852.03 mm/s, and repetition frequency of 116 kHz. With these parameters, the surface corrosion is effectively removed, revealing a distinct metal luster and meeting the standard for surface treatment before welding.
通讯机构：
[He, HY; Wang, XL ] U;[He, HY ] Y;Univ South China, Sch Nucl Sci & Technol, Hengyang, Hunan, Peoples R China.;Univ South China, Coll Mech Engn, Hunan Prov Key Lab Ultrafast Micro Nano Technol &, Hengyang, Hunan, Peoples R China.;Yangtze Univ, Sch Elect Informat & Elect Engn, Jingzhou, Peoples R China.
摘要：
Four-layer hexagonal silicon carbide (4H-SiC) is a promising material for high-temperature and radiation-rich environments due to its excellent thermal conductivity and radiation resistance. However, real 4H-SiC crystals often contain Shockley-type stacking faults (SSF), which can affect their radiation resistance. This study employed molecular dynamics (MD) simulation method to explore the effects of SSF on radiation displacement cascades in 4H-SiC. We conducted a comprehensive study of various SSF within the crystalline framework of 4H-SiC, and analyzed their stacking fault energy (SFE). We simulated the radiation displacement cascade in 4H-SiC with SSF and analyzed the effects of SSF on the distribution of radiation displacement defects. We simulated the radiation displacement cascade in 4H-SiC with SSF under different energies of primary knock-on atom (EPKA) and temperatures (T) conditions, and analyzed the variation pattern of the number of radiation displacement defects and clusters. The results indicated that SSF limits defect distribution position. SSF has an effect on the defects and clusters of 4H-SiC in the displacement cascade, and SSF can affect the maximum working temperature of 4H-SiC. Four-layer hexagonal silicon carbide (4H-SiC) is a promising material for high-temperature and radiation-rich environments due to its excellent thermal conductivity and radiation resistance. Shockley-type stacking faults serve as one of the factors influencing the radiation resistance of 4H-SiC.
期刊：
Journal of Radioanalytical and Nuclear Chemistry,2024年333(5):2263-2271 ISSN：0236-5731
通讯作者：
Liu, L
作者机构：
[Yu, Shiwei; Liu, Lie; Ling, Ke; Liu, L] Univ South China, Sch Elect Engn, Hengyang 421000, Peoples R China.;[Liu, Lie; Zhang, Junze; Han, Lianghua; Liu, L] Univ South China, Sch Mech Engn, Hengyang 421000, Peoples R China.
通讯机构：
[Liu, L ] U;Univ South China, Sch Elect Engn, Hengyang 421000, Peoples R China.;Univ South China, Sch Mech Engn, Hengyang 421000, Peoples R China.
作者机构：
[Fang, Hongyi; Ke, Weijun; Pu, Dexin; Guan, Hongling; Zhou, Shun; Chen, Guoyi; Fang, Guojia; Fu, Shiqiang; Ke, WJ; Jia, Peng; Wang, Chen] Wuhan Univ, Sch Phys & Technol, Key Lab Artificial Micro & Nanostruct, Minist Educ, Wuhan 430072, Peoples R China.;[Jumabaev, Abduvakhid; Hushvaktov, Hakim] Samarkand State Univ, 15 Univ Blvd, Samarkand 140104, Uzbekistan.;[Meng, Weiwei] South China Normal Univ, South China Acad Adv Optoelect, Guangzhou 510006, Peoples R China.;[Wang, Xingzhu; Wang, XZ] Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China.;[Wang, Xingzhu; Wang, XZ] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Meng, WW ; Wang, XZ ; Jumabaev, A ] S;[Ke, WJ ] W;Wuhan Univ, Sch Phys & Technol, Key Lab Artificial Micro & Nanostruct, Minist Educ, Wuhan 430072, Peoples R China.;Samarkand State Univ, 15 Univ Blvd, Samarkand 140104, Uzbekistan.;South China Normal Univ, South China Acad Adv Optoelect, Guangzhou 510006, Peoples R China.
关键词：
blade coating;large area;strain;tandem solar cells;wide-bandgap perovskites
摘要：
Blade‐coated wide‐bandgap perovskites encounter top–down inhomogeneity strains. Utilizing mixed‐cation post‐treatment for strain relief, large‐area wide‐bandgap solar cells demonstrate enhanced efficiency and stability. Specifically, 1 cm2‐area 1.77 eV‐bandgap cells achieve an 18.71% efficiency (stabilized at 18.50%), while 4‐terminal all‐perovskite tandems reach an exceptional 27.64% efficiency, coupled with enhanced stability. Abstract The realization of efficient large‐area perovskite solar cells stands as a pivotal milestone for propelling their future commercial viability. However, the upscaling fabrication of perovskite solar cells is hampered by efficiency losses, and the underlying growth mechanism remains enigmatic. Here, it is unveiled that a prevalent upscaling technology, namely blade‐coating, inherently triggers top‐down inhomogeneity strains, predominantly concentrated on the surface of wide‐bandgap perovskite films. Through strain mitigation strategies, the perovskite films exhibit reduced halide vacancies, leading to enhanced stability and improved optoelectronic characteristics. Consequently, the blade‐coated perovskite solar cells achieve minimal efficiency loss when transitioning from small‐area to large‐area devices, enabling the realization of 1 cm2‐area 1.77 eV‐bandgap cells with a remarkable efficiency of 18.71%. Additionally, the strain‐relieved device exhibits an exceptional 109% retention of its initial efficiency even after 400 h of continuous operation, in stark contrast to the control device which experiences a decline to 91%. Furthermore, the resulting 4‐terminal all‐perovskite tandem solar cells crafted utilizing blade‐coated 1.77 eV‐bandgap subcells achieve a maximum efficiency of 27.64% (stabilized at 27.28%). This study not only sheds light on the intricacies of upscaling preparation techniques but also overcomes potential obstacles that can impede the trajectory toward achieving large‐scale perovskite solar cells.
摘要：
A high-accuracy optical vector network analyzer (OVNA) based on optical carrier-suppressed double sideband (CS-DSB) modulation is proposed and experimentally demonstrated. The +/- 1st-order sideband signals are generated by CS-DSB modulation and then pass through the symmetric optical device under test (DUT). The band-stop or band-pass responses can be realized by detecting and processing the double frequency of the driven RF signal. Compared with the conventional symmetrical DSB-based OVNA, the measurement accuracy is improved by eliminating the errors caused by the even-order sidebands, and the complexity is reduced as the proposed method with only one step measurement can avoid the complex postprocessing. In addition, the optical carrier is aligned to the center frequency of the DUT by employing the Pound-Drever-Hall (PDH) technique, which provides stable measurement. At the same time, the limitation that the band-pass responses cannot be measured by the traditional single-sideband (SSB)-based OVNA is overcome. Additionally, accurate magnitude and phase responses of the DUT near the optical carrier can be also achieved since the proposed OVNA is optical filter-immune. The proposed method is theoretically analyzed and verified by experiment. A Fabry-Perot (FP) interferometer serves as the symmetric DUT; the band-stop responses in a frequency range of 6 GHz are obtained with a resolution of 1.2 MHz; and the band-pass responses with the range from 0 to 13 GHz offsetting the optical carrier are also obtained. The measurement time can reach up to 30 min with high stability. The proposed OVNA offers enhanced accuracy and a stable approach for applications in photonic systems and other innovations. (c) 2024 Optica Publishing Group
摘要：
A deep framework for the accelerated multislice magnetic resonance imaging (MRI) reconstruction is proposed here. It exploits the non‐local interslice correlation information between adjacent slices in MRI image sequences to reconstruct high‐quality undersampled MRI images. A novel texture Transformer architecture for MRI reconstruction is designed. Such a framework enables united feature learning across target slice and adjacent slices, which encourages the exploration of deep features and transferring of accurate texture features across adjacent slices by the attention mechanism. The proposed multislice texture transformer network can be constructed in a cross‐scale way. It enables to recovery textures of MRI images via different levels, and enables to reserve more details in MRI reconstruction. Abstract Magnetic resonance imaging (MRI) is a non‐interposition imaging technique that provides rich anatomical and physiological information. Yet it is limited by the long imaging time. Recently, deep neural networks have shown potential to significantly accelerate MRI. However, most of these approaches ignore the correlation between adjacent slices in MRI image sequences. In addition, the existing deep learning‐based methods for MRI are mainly based on convolutional neural networks (CNNs). They fail to capture long‐distance dependencies due to the small receptive field. Inspired by the feature similarity in adjacent slices and impressive performance of Transformer for exploiting the long‐distance dependencies, a novel multislice texture transformer network is presented for undersampled MRI reconstruction (TTMRI). Specifically, the proposed TTMRI is consisted of four modules, namely the texture extraction, correlation calculation, texture transfer and texture synthesis. It takes three adjacent slices as inputs, in which the middle one is the target image to be reconstructed, and the other two are auxiliary images. The multiscale features are extracted by the texture extraction module and their inter‐dependencies are calculated by the correlation calculation module, respectively. Then the relevant features are transferred by the texture transfer module and fused by the texture synthesis module. By considering inter‐slice correlations and leveraging the Transformer architecture, the joint feature learning across target and adjacent slices are encouraged. Moreover, TTMRI can be stacked with multiple layers to recover more texture information at different levels. Extensive experiments demonstrate that the proposed TTMRI outperforms other state‐of‐the‐art methods in both quantitative and qualitative evaluationsions.
作者机构：
[Xinyi Liu; Xiaoye Zhang; Zhanfeng Li] Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, China;[Jinbo Chen] School of Electrical Engineering, University of South China, Hengyang, China;[Yanting Tian] College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, China;[Baoyou Liu; Gang Yue] Ningxia Hui Autonomous Region Screen Display Organic Materials Engineering Technology Research Center, Ningxia Sinostar Display Material Co., Ltd., Yinchuan, China;[Changfeng Si] Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, Fife, UK
通讯机构：
[Zhanfeng Li; Hua Dong] K;[Jinbo Chen] S;[Changfeng Si] O;Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, China<&wdkj&>School of Electrical Engineering, University of South China, Hengyang, China<&wdkj&>Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, Fife, UK<&wdkj&>Key Laboratory of Photonics Technology for Information School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an, China
关键词：
Hole-transport materials;Inverted perovskite solar cells;Chlorinated small molecules;Donor–acceptor–donor structure
摘要：
Although doped hole-transport materials (HTMs) offer an efficiency benefit for perovskite solar cells (PSCs), they inevitably diminish the stability. Here, we describe the use of various chlorinated small molecules, specifically fluorenone-triphenylamine (FO-TPA)-x-Cl [x = para, meta, and ortho (p, m, and o)], with different chlorine-substituent positions, as dopant-free HTMs for PSCs. These chlorinated molecules feature a symmetrical donor–acceptor–donor structure and ideal intramolecular charge transfer properties, allowing for self-doping and the establishment of built-in potentials for improving charge extraction. Highly efficient hole-transfer interfaces are constructed between perovskites and these HTMs by strategically modifying the chlorine substitution. Thus, the chlorinated HTM-derived inverted PSCs exhibited superior efficiencies and air stabilities. Importantly, the dopant-free HTM FO-TPA-o-Cl not only attains a power conversion efficiency of 20.82% but also demonstrates exceptional stability, retaining 93.8% of its initial efficiency even after a 30-day aging test conducted under ambient air conditions in PSCs without encapsulation. These findings underscore the critical role of chlorine-substituent regulation in HTMs in ensuring the formation and maintenance of efficient and stable PSCs.
摘要：
<jats:p>Metal halide perovskite (MHP) detectors are highly esteemed for their outstanding photoelectric properties and versatility in applications. However, they are unfortunately prone to degradation, which constitutes a significant barrier to their sustained performance. This review meticulously delves into the causes leading to their instability, predominantly attributable to factors such as humidity, temperature, and electric fields and, notably, to various radiation factors such as X-rays, γ-rays, electron beams, and proton beams. Furthermore, it outlines recent advancements in strategies aimed at mitigating these detrimental effects, emphasizing breakthroughs in composition engineering, heterostructure construction, and encapsulation methodologies. At last, this review underscores the needs for future improvements in theoretical studies, material design, and standard testing protocols. In the pursuit of optimizing the chemical stability of MHP detectors, collaborative efforts are in an imperative need. In this way, broad industrial applications of MHP detectors could be achieved.</jats:p>
通讯机构：
[Xu, BM ; Wang, XZ] S;[Wang, XZ ] U;Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China.;Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;Southern Univ Sci & Technol, Shenzhen Engn Res & Dev Ctr Flexible Solar Cells, Shenzhen 518055, Peoples R China.
摘要：
As the most promising lead-free perovskite, tin-based perovskite has attracted much attention due to its suitable bandgap and low toxicity. However, many defects (tin vacancy defects caused by Sn2+ oxidation to Sn4+, grain boundary defects and point defects) in tin-based perovskite lead to serious losses in device efficiency. Here, a universal and effective doping strategy is delivered to improve the structure and optoelectronic properties of tin-based perovskite films through 2,8-dibromo-dibenzothiophene-S,S-dioxide (BrDS) doping. The introduction of BrDS can effectively inhibit the oxidation of Sn2+ and passivate grain boundary defects and point defects in the perovskite films. The tin-based perovskite film doped with BrDS exhibits higher carrier lifetime and crystal quality. As a result, the BrDS-doped device achieves a power conversion efficiency of 14.98% with a certified efficiency of 14.36%, which is one of the highest PCEs among all values reported to date for tin-based PSCs. In addition, the BrDS-doped PSC devices exhibit significantly improved long-term stability and improved operational stability in a N-2 atmosphere. This work represents a noteworthy step towards manufacturing efficient and stable tin-based PSCs.
作者机构：
[Liang, Xianxiao; Zhao, Yang; Shi, Xuan; Shi, X; Deng, Xueyi] Chongqing Univ Posts & Telecommun, Sch Optoelect Engn, Chongqing 400065, Peoples R China.;[Liang, Xianxiao; Zhao, Yang; Shi, Xuan; Shi, X; Xiao, Zeyun; Peng, Xiaoyu; Deng, Xueyi] Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China.;[Zhao, Hongquan] South China Univ, Sch Elect Engn, Hengyang, Peoples R China.;[Yuan, Hongkuan] Southwest Univ, Sch Phys Sci & Technol, Chongqing, Peoples R China.
通讯机构：
[Yuan, HK ; Zhao, HQ ] S;[Shi, X ] C;Chongqing Univ Posts & Telecommun, Sch Optoelect Engn, Chongqing 400065, Peoples R China.;Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China.;South China Univ, Sch Elect Engn, Hengyang, Peoples R China.
关键词：
WSe2/Si2H heterojunction;first principles;extra electric field;optical absorption coefficient
摘要：
<jats:title>Abstract</jats:title>
<jats:p>Van der Waals heterojunctions based on two-dimensional (2D) materials hold great potential applications in photodetectors. Using the density functional theory (DFT) method, the structures, electronic and optical properties of van der Waals WSe<jats:sub>2</jats:sub>/Si<jats:sub>2</jats:sub>H heterojunction are investigated. 1.32 eV of indirect bandgap is calculated from the WSe<jats:sub>2</jats:sub>/Si<jats:sub>2</jats:sub>H heterojunction, which is 0.3 eV and 0.1 eV smaller than those of its monolayer WSe<jats:sub>2</jats:sub> and Si<jats:sub>2</jats:sub>H. This contributes to the photocarrier generations, and the Type-II heterojunction also benefits to the separation of the photogenerated electron and hole pairs. A significant hole mobility 1.05 × 10<jats:sup>4</jats:sup> cm<jats:sup>2</jats:sup> V<jats:sup>−1</jats:sup> s<jats:sup>−1</jats:sup> of the heterojunction along the y-direction is obtained. Moreover, a high Ultraviolet light (UV) absorption coefficient is presented in the heterojunction. The heterojunction transforms to Type-I under a vertical electric field, with the bandgap, orientation and amount of transfer electrons modulated sufficiently. As a result, the optical absorption coefficient of the heterojunction is also improved significantly, leading to the red-shift of the absorption spectrum. These excellent properties address the WSe<jats:sub>2</jats:sub>/Si<jats:sub>2</jats:sub>H heterojunction one of the good candidates for UV detectors.</jats:p>
作者机构：
[Luo, Xiao-Qing; Fan, Bo; Yi, Huang] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Fan, Bo] Soochow Univ, Sch Elect & Informat Engn, Suzhou 215006, Peoples R China.;[Bu, Feng] Suzhou Vocat Univ, Sch Elect Informat Engn, Suzhou 215104, Peoples R China.;[Chen, Fang; Chen, F] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Transducer Technol, Shanghai 200050, Peoples R China.;[Luo, Xiao-Qing] Univ South China, Hunan Prov Key Lab Ultrafast Micro Nano Technol, Adv Laser Manufacture, Hengyang 421001, Peoples R China.
通讯机构：
[Fan, B ] U;[Chen, F ] C;Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;Soochow Univ, Sch Elect & Informat Engn, Suzhou 215006, Peoples R China.;Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Transducer Technol, Shanghai 200050, Peoples R China.
关键词：
air damping;disk resonator gyroscope;energy dissipation;thermoelastic damping
摘要：
The micro disk resonator gyroscope is a micro-mechanical device with potential for navigation-grade applications, where the performance is significantly influenced by the quality factor, which is determined by various energy dissipation mechanisms within the micro resonant structure. To enhance the quality factor, these gyroscopes are typically enclosed in high-vacuum packaging. This paper investigates a wafer-level high-vacuum-packaged (<0.1 Pa) cobweb-like disk resonator gyroscope, presenting a systematic and comprehensive theoretical analysis of the energy dissipation mechanisms, including air damping, thermoelastic damping, anchor loss, and other factors. Air damping is analyzed using both a continuous fluid model and an energy transfer model. The analysis results are validated through quality factor testing on batch samples and temperature characteristic testing on individual samples. The theoretical results obtained using the energy transfer model closely match the experimental measurements, with a maximum error in the temperature coefficient of less than 2%. The findings indicate that air damping and thermoelastic damping are the predominant energy dissipation mechanisms in the cobweb-like disk resonant gyroscope under high-vacuum conditions. Consequently, optimizing the resonator to minimize thermoelastic and air damping is crucial for designing high-performance gyroscopes.
作者机构：
[Zhang, Pengcheng; Zhou, Pengfei] Univ South China, Sch Elect Engn, Hengyang 421200, Peoples R China.
通讯机构：
[Zhang, PC ] U;Univ South China, Sch Elect Engn, Hengyang 421200, Peoples R China.
摘要：
The Li(2)Mg(3)Ti(1-x)Al4(x/3)O(6) (0 <= x <= 0.1) ceramics are synthesized using the solid phase method, showing excellent microwave dielectric properties with epsilon(r) = 14.05, Q x f = 144 500 GHz, and tau(f )= -43 ppm/C-degrees at x = 0.04. Rietveld refinements, based on the XRD data, reveal that the Li(2)Mg(3)Ti(1-x)Al4(x/3)O(6) ceramics crystallize in the rock salt structure with Fm-3m space group. The relationship between the crystal structure and intrinsic microwave dielectric properties is studied in detail. The variation in the dielectric constant is related to ionic polarization and relative density. The quality factor (Q x f) demonstrates a strong correlation with lattice energy, relative density, and concentration of Ti3+. The variation of tau f is influenced by the bond thermal expansion coefficient and bond valence. The dielectric resonant antenna, manufactured from Li2Mg3Ti0.96Al0.0533O6-0.09TiO(2) ceramic with near-zero tau f, shows a bandwidth of 230 MHz at 7.40 GHz and a high radiant efficiency, which indicates that high-quality factor Li2Mg3Ti0.96Al0.0533O6 ceramic has significant potential in relevant fields such as 5G and smart driving.
作者机构：
[Xu, Baomin; Wang, Xingzhu; Zhang, Jiyao; Liu, Zhixin; Wang, Deng; Wang, XZ; Wang, Jiangfeng; Zhu, Peide; Xu, Jianpeng; Zeng, Jie] Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China.;[Xu, Baomin; Wang, Xingzhu; Wang, XZ] Southern Univ Sci & Technol, Key Univ Lab Highly Efficient Utilizat Solar Energ, Shenzhen 518055, Peoples R China.;[Ying, Lei; Zhu, Chunguang; Ying, L] South China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Peoples R China.;[Yan, Lei; Xu, Yintai; Yan, L] Xiangtan Univ, Coll Chem, Sch Phys & Optoelect, Xiangtan 411105, Hunan, Peoples R China.;[Troshin, Pavel A.] Harbin Inst Technol, Zhengzhou Res Inst, Troshin, 26 Longyuan East 7th, Zhengzhou 450000, Henan, Peoples R China.
通讯机构：
[Xu, BM ; Ying, L ; Wang, XZ] S;[Wang, XZ ] U;[Yan, L ] X;Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China.;Southern Univ Sci & Technol, Key Univ Lab Highly Efficient Utilizat Solar Energ, Shenzhen 518055, Peoples R China.
关键词：
Ternary organic photovoltaics;Carrier dynamics;High efficiency;Energy loss
摘要：
Attaining a balanced charge carrier generation is a significant challenge in organic photovoltaics (OPVs). To enhance device performance, the ternary strategy has emerged as an effective approach. In this study, two Y6 derivatives, QIP-4F and QIP-4Cl, containing quinoxalineimide (QI) building blocks fused with thienylthiophene as the central unit were incorporated into the PM6:L8-BO system. The quinoxalineimide units reduce the energy losses in charge carrier extraction and non-radiative charge recombination. Furthermore, the increasing steric hindrance in the central block impacts phase separation and ordered intermolecular packing, which enhances the charge transport and minimizes the charge recombination. Ultimately, the PM6:L8-BO:QIP-4Cl device achieved a champion efficiency of 19.05%, offering a promising direction for enhancing the photovoltaic performance of OPVs. (c) 2024 Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
作者机构：
[Xie, Shujing; Wang, Minghua; Zhu, Ziyan; Wang, Yan] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Wang, Y ] U;Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
关键词：
geographic routing;link detection and repair;node collaborative scheduling;energy optimization
摘要：
Energy efficiency and data reliability are important indicators to measure network performance in wireless sensor networks. In existing research schemes of routing protocols, the impact of node coverage on the network is often ignored, and the possibility that multiple sensor nodes may sense the same spatial point is not taken into account, which results in a waste of network resources, especially in large-scale networks. Apart from that, the blindness of geographic routing in data transmission has been troubling researchers, which means that the nodes are unable to determine the validity of data transmission. In order to solve the above problems, this paper innovatively combines the routing protocol with the coverage control technique and proposes the node collaborative scheduling algorithm, which fully considers the correlation characteristics between sensor nodes to reduce the number of active working nodes and the number of packets generated, to further reduce energy consumption and network delay and improve packet delivery rate. In order to solve the problem of unreliability of geographic routing, a highly reliable link detection and repair scheme is proposed to check the communication link status and repair the invalid link, which can greatly improve the packet delivery rate and throughput of the network, and has good robustness. A large number of experiments demonstrate the effectiveness and superiority of our proposed scheme and algorithm.
期刊：
IEEE JOURNAL OF BIOMEDICAL AND HEALTH INFORMATICS,2024年PP:1-12 ISSN：2168-2194
作者机构：
[Hong Zhou] Department of Radiology, The First Affiliated Hospital University of South China, Hengyang, China;[Bingo Wing-Kuen Ling] School of Information Engineering, Guangdong University of Technology, Guangzhou, China;[Xinglong Tang; Jiaxi Zhao; Dongping Xiong; Lijun Ouyang] School of Computing/[Xinglong Tang; Jiaxi Zhao; Dongping Xiong; Lijun Ouyang] Software, University of South China, Hengyang, China;[Kok Lay Teo] School of Mathematical Science, Sunway University, Kuala Lumpur, Malaysia
摘要：
Multimodal medical image fusion aims to integrate complementary information from different modalities of medical images. Deep learning methods, especially recent vision Transformers, have effectively improved image fusion performance. However, there are limitations for Transformers in image fusion, such as lacks of local feature extraction and cross-modal feature interaction, resulting in insufficient multimodal feature extraction and integration. In addition, the computational cost of Transformers is higher. To address these challenges, in this work, we develop an adaptive cross-modal fusion strategy for unsupervised multimodal medical image fusion. Specifically, we propose a novel lightweight cross Transformer based on cross multi-axis attention mechanism. It includes cross-window attention and cross-grid attention to mine and integrate both local and global interactions of multimodal features. The cross Transformer is further guided by a spatial adaptation fusion module, which allows the model to focus on the most relevant information. Moreover, we design a special feature extraction module that combines multiple gradient residual dense convolutional and Transformer layers to obtain local features from coarse to fine and capture global features. The proposed strategy significantly boosts the fusion performance while minimizing computational costs. Extensive experiments, including clinical brain tumor image fusion, have shown that our model can achieve clearer texture details and better visual quality than other state-of-the-art fusion methods.
