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Molecular packing tuning via chlorinated end group enables efficient binary organic solar cells over 18.5%

Carbon Energy 2024年第3期6卷 196-203页

作者： Yafeng Li zhenyu chen Xingzheng Yan ziyi Ge zhejiang Business Technology Institute NingboZhejiangChina zhejiang Engineering Research Center for Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboZhejiangChina Center of Materials science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina

Designing novel nonfullerene acceptors(NFAs)is of vital importance for the development of organic solar cells(OsC).Modification on the side chain and end group are two powerful tools to construct efficient ***,based on the high-performance L8BO,we selected 3-ethylheptyl to substitute the inner chain of 2-ethylhexyl,obtaining the backbone of *** we introduced different halogen atoms of fluorine and chlorine on 2-(3-oxo-2,3-dihydro-1Hinden-1-ylidene)malononitrile end group(EG)to construct efficient NFAs named BON3-F and BON3-Cl,*** donor D18 was chosen to combine with two novel NFAs to construct OsC ***,D18:BON3-Cl-based device shows a remarkable power conversion efficiency(PCE)of 18.57%,with a high open-circuit voltage(V_(OC))of 0.907 V and an excellent fill factor(FF)of 80.44%,which is one of the highest binary PCE of devices based on D18 as the ***,BON3-F-based device shows a relatively lower PCE of 17.79%with a decreased FF of 79.05%.The better photovoltaic performance is mainly attributed to the red-shifted absorption,higher electron and hole mobilities,reduced charge recombination,and enhanced molecular packing in the D18:BON3-Cl ***,we performed stability tests on two binary systems;the D18:BON3-Cl and D18:BON3-F devices maintain 88.1%and 85.5%of their initial efficiencies after 169 h of storage at 85°C in an N2-filled glove box,*** work demonstrates the importance of selecting halogen atoms on EG and provides an efficient binary system of D18:BON3-Cl for further improvement of PCE.

关键词： binary organic solar cell chlorinated end group molecular packing

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The Effect of Procrastination on Physical Exercise among College students—The Chain Effect of Exercise Commitment and Action Control

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International Journal of Mental Health Promotion 2024年第8期26卷 611-622页

作者： zhang W. Xu M. Feng Y. Mao z. Yan z. Department of Physical Education Qufu Normal University Qufu 273165 China Department of Internal Medicine The Ohio State University Columbus 43210 OH United States Teaching Department of Common Courses Shandong University of Art & Design Jinan 250399 China school of Psychology Beijing Sport University Beijing 100084 China school of Physical Education Chongqing University of Posts and Telecommunications Chongqing 400065 China

Background: Exercise procrastination is prevalent among college students, causing decline in physical fitness. It is imperative to investigate the mechanism affecting college students’ physical activity behaviors. This study was aimed at investigating the effect of procrastination on college students’ physical exercise behavior, and the chain mediation effects of exercise commitment and action control (AC), to provide a theoretical basis for interventions targeting physical exercise behavior among college students. Methods: A questionnaire survey was conducted using convenience sampling. The General Procrastination scale, Exercise Commitment scale, Action Control scale, and Physical Activity Rating scale-3 questionnaires were used. Participants were 581 college students (age 19.27 ± 0.94 years; 243 males and 338 females). statistical methods of regression analysis and structural equation modeling (sEM) were applied. Results: Procrastination, exercise commitment, and action control were found to be significant predictors of physical exercise behavior. Among these predictors, exercise commitment and action control showed full mediation effects in the relationship between procrastination and physical exercise behavior, and explained 25.48% and 30.77% of the total variance, respectively. The chain mediation effect of exercise commitment-action control was significant, accounting for 22.60% of the total variance, and the total indirect effect was 79.33%. Conclusion: Therefore, higher procrastination was associated with less participation in physical exercise behavior among college students. Improvements in exercise commitment and volitional decision-making ability for physical exercise behavior promoted physical exercise behavior, and increased exercise commitment promoted volitional decision-making ability among the students. The chain reaction effect of exercise commitment and action control also buffered the negative effects of procrastination on physical exercise beh

关键词： action control chain intermediary College student exercise behavior exercise commitment procrastination

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Quasi-two dimensional Ruddlesden−Popper halide perovskites for laser applications

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Frontiers of physics 2024年第2期19卷 53-71页

作者： Kun chen Qianpeng zhang Yin Liang Jiepeng song Chun Li shi chen Fang Li Qing zhang school of Mechanical and Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China school of Materials science and Engineering Peking UniversityBeijing 100871China Institute of Applied Physics and Materials Engineering Macao UniversityMacao 999078China

Quasi-two-dimensional(2D)Ruddlesden‒Popper(RP)halide perovskites,as a kind of emerged two-dimensional layered materials,have recently achieved great attentions in lasing materials field owing to their large exciton binding energy,high emission yield,large optical gain,and wide-range tuning of optical *** review will introduce research progresses of RP halide perovskites for lasing applications in aspects of materials,photophysics,and devices with emphasis on emission and lasing properties tailored by the molecular composition and *** materials,structures and fabrications are introduced in the first ***,the optical transitions and amplified spontaneous emission properties are discussed from the aspects of electronic structure,exciton,gain dynamics,and interface ***,the research progresses on lasing devices are summarized and several types of lasers including VCsEL,DFB lasers,microlasers,random lasers,plasmonic lasers,and polariton lasers are *** last,the challenges and perspectives would be provided.

关键词： two-dimensional materials metal halide perovskite Ruddlesden−Popper halide perovskites lasing emission

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Anti-saturation fault-tolerant adaptive torsional vibration control with fixed-time prescribed performance for rolling mill main drive system

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Journal of Iron and steel Research International 2024年第3期31卷 660-669页

作者： shuang Liu chen Du Cong zhang zhen-hua Bai Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan UniversityQinhuangdao 066004HebeiChina National Engineering Research Center for Equipment and Technology of Cold strip Rolling Yanshan UniversityQinhuangdao 066004HebeiChina

An anti-saturation fault-tolerant adaptive torsional vibration control method with fixed-time prescribed performance for the rolling mill main drive system(RMMDs)was investigated,which is affected by control input saturation,actuator faults,sensor measurement errors,and parameter ***,we gave a continuously differentiable saturation function to approximate the control input saturation characteristic of the RMMDs,translating the saturation characteristic into the matched uncertainty and unknown time-varying gain in the ***,an RMMDs mathematical model with unmatched uncertainty and unknown time-varying gain was developed,taking into account the presence of control input saturation,actuator faults,sensor measurement errors,and parameter *** on the established mathematical model,an error transformation model of the roll speed tracking was constructed by the equivalent error transformation *** to the error transformation model,a barrier Lyapunov function and a novel adaptive controller were studied to ensure that the roll speed tracking error always evolves inside a fixed-time asymmetric ***,numerical simulations were performed in Matlab/simulink to verify the effectiveness and superiority of the proposed control method in suppressing the RMMDs torsional vibration.

关键词： Fixed-time prescribed performance Control input saturation Actuator fault Unknown time-varying gain Adaptive control Asymmetric constraint

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Numerical Analysis of Cold-Formed Thin-Walled steel short Columns with Pitting Corrosion during Bridge Construction

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structural Durability & Health Monitoring 2024年第2期18卷 181-196页

作者： Hongzhang Wang Jing Guo shanjun Yang Chaoheng cheng Jing chen zhihao chen CCCC second Harbor Engineering Third Engineering Co. Ltd.Zhenjiang212000China suqian Highway Development Center Suqian223800China school of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou221116China

Pitting corrosion is harmful during bridge construction,which will lead to uneven roughness of steel surfaces and reduce the thickness of ***,the effect of pitting corrosion on the mechanical properties of cold-formed thin-walled steel stub columns is studied,and the empirical formulas are established through regression fitting to predict the ultimate load of web and flange under pitting *** detail,the failure modes and load-displacement curves of specimens with different locations,area ratios,and depths are obtained through a large number of non-linear finite element *** for the specimens with pitting corrosion on the web,all the specimens are subject to local buckling failure,and the failure mode will not change with pitting corrosion,but the failure location will change with pitting corrosion location;the s.z.,location,and area ratio of pitting corrosion have little influence on the ultimate load of cold-formed thin-walled steel short columns,but the loss rate of pitting corrosion section area has a greater impact on the ultimate bearing *** for the specimen with flange pitting corrosion,the location and area ratio of pitting corrosion have less influence on the ultimate load of cold-formed thin-walled steel short columns,and the section area loss rate has greater influence on the ultimate bearing capacity;the impact of web pitting corrosion on the ultimate load is greater than that of flange pitting corrosion under the same condition of pitting corrosion section *** prediction formulas of limit load which are suitable for pitting corrosion of web and flange are established,which can provide a reference for performance evaluation of corroded cold-formed thin-walled steel.

关键词： Pitting corrosion cold-formed thin-walled steel ultimate load prediction formula short columns

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Analytical solution for the Reissner-sagoci Problem of a Piezoelectric Half-space

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Acta Mechanica solida sinica 2024年第3期37卷 363-370页

作者： Keqiang Hu Cun-Fa Gao zengtao chen zheng zhong state Key Laboratory of Mechanics and Control of Mechanical structures Nanjing University of Aeronautics and AstronauticsNanjing210016China Department of Mechanical Engineering University of AlbertaEdmontonABT6G 1H9Canada school of science Harbin Institute of TechnologyShenzhen518055China

In this paper,a transversely isotropic piezoelectric half-space with the isotropy axis parallel to the z-axis is considered under rotation on a rigid circular disk bonded to the surface of the piezoelectric *** is a type of Reissner-sagoci mixed boundary value *** utilizing the Hankel transform,the mixed boundary value problem is simplified into solving a pair of dual integral ***-field analytical expressions for displacement,stresses,and electric displacement inside the half-space are *** shear stresses and electric displacement on the surface are found to be singular at the edge of the rigid circular disk,and the stress intensity factors and electric displacement intensity factor are *** results show that material properties and geometric s.z. have significant effects on displacement,shear stresses,and electric displacement.

关键词： Piezoelectric half-space Circular disk Reissner-sagoci problem stress intensity factor Electric displacement intensity factor

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Heart-Net: A Multi-Modal Deep Learning Approach for Diagnosing Cardiovascular Diseases

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Computers, Materials and Continua 2024年第3期80卷 3967-3990页

作者： Alsekait D.M. shdefat A.Y. Nabil A. Nawaz A. Rana M.R.R. Ahmed z. Fathi H. AbdElminaam D.s. Department of Computer science and Information Technology Applied College Princess Nourah bint Abdulrahman University Riyadh 84428 Saudi Arabia College of Engineering and Technology American University of the Middle East Egaila 15453 Kuwait Faculty of Computers science Misr International University Cairo 11800 Egypt University Institute of Information Technology PMAS Arid Agriculture University Rawalpindi 46000 Pakistan Department of Computer science International Islamic University Islamabad 04436 Pakistan Jadara Research Center Jadara University Irbid 21110 Jordan Information system Department Faculty of Computers and Artificial Intelligence Benha University Banha 13511 Egypt MEU Research Unit Middle East University Amman 11831 Jordan

Heart disease remains a leading cause of morbidity and mortality worldwide, highlighting the need for improved diagnostic methods. Traditional diagnostics face limitations such as reliance on single-modality data and vulnerability to apparatus faults, which can reduce accuracy, especially with poor-quality images. Additionally, these methods often require significant time and expertise, making them less accessible in resource-limited settings. Emerging technologies like artificial intelligence and machine learning offer promising solutions by integrating multi-modality data and enhancing diagnostic precision, ultimately improving patient outcomes and reducing healthcare costs. This study introduces Heart-Net, a multi-modal deep learning framework designed to enhance heart disease diagnosis by integrating data from Cardiac Magnetic Resonance Imaging (MRI) and Electrocardiogram (ECG). Heart-Net uses a 3D U-Net for MRI analysis and a Temporal Convolutional Graph Neural Network (TCGN) for ECG feature extraction, combining these through an attention mechanism to emphas.z. relevant features. Classification is performed using Optimized TCGN. This approach improves early detection, reduces diagnostic errors, and supports personalized risk assessments and continuous health monitoring. The proposed approach results show that Heart-Net significantly outperforms traditional single-modality models, achieving accuracies of 92.56% for Heartnet Dataset I (HNET-DsI), 93.45% for Heartnet Dataset II (HNET-DsII), and 91.89% for Heartnet Dataset III (HNET-DsIII), mitigating the impact of apparatus faults and image quality issues. These findings underscore the potential of Heart-Net to revolutionize heart disease diagnostics and improve clinical outcomes. Copyright © 2024 The Authors. Published by Tech science Press.

关键词： classification deep learning electrocardiogram Heart diseases magnetic resonance imaging

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Blood pressure targets in patients with chronic kidney disease:Comments and controversies

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Chinese Medical Journal 2024年第3期137卷 270-272页

作者： Ying zheng Guangyan Cai Xiangmei chen Department of Nephrology First Medical Center of Chinese PLA General HospitalNational Key Laboratory of Kidney DiseasesNational Clinical Research Center for Kidney DiseasesBeijing Key Laboratory of Kidney Disease ResearchBeijing 100853China

According to the Global Burden of Disease study 2017,there are 132 million patients with chronic kidney disease(CKD)in China,^([1])and the prevalence of hypertension in Chinese patients with CKD(67.3%)is significantly higher than that in the general population(23.2%).^([2,3])CKD is both a cause and a consequence of hypertension,and these two conditions form a vicious cycle that leads to the high prevalence rate of hypertension in patients with *** hypertension accelerates the deterioration of renal function,which significantly increases the risk of developing end-stage renal disease(EsRD),as well as cardiovascular and cerebrovascular diseases,leading to poor patient outcomes.

关键词： patients Blood hypertension

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Repeat-pass space-surface bistatic sAR tomography:accurate imaging and first experiment

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science China(Information sciences) 2024年第09期67卷 245-262页

作者： zhiyang chen Yuanhao LI cheng HU shenglei WANG Xinpeng chen Mihai DATCU Andrea Virgilio MONTI-GUARNIERI Radar Technology Research Institute School of Information and Electronics Beijing Institute of Technology Beijing Key Laboratory of Embedded Real-Time Information Processing Technology Beijing Institute of Technology Advanced Technology Research Institute Beijing Institute of Technology CEOspace Tech University Politehnica of Bucharest Dipartimento di Elettronica Informazione e Bioingegneria Politecnico di Milano

space-surface bistatic synthetic aperture radar(ss-BisAR) offers an additional observation angle for monostatic spaceborne sAR, making it a promising technology for high-accuracy deformation retrieval technology in local regions. Repeat-pass ss-BisAR tomography can accurately estimate the surfaces of buildings and steep areas, effectively removing terrain phases during deformation retrieving. However, inaccuracies in the orbital ephemeris can lead to image geometry distortion, reducing image pair coherence,introducing interferometric phase errors, and consequently deteriorating tomographic precision. This paper precisely models the image geometry distortion and interferometric phase error caused by repeat-pass ephemeris error. We propose an ephemeris correction method based on the chirp-z transform to address these issues. Furthermore, we introduce an accurate tomography model to improve 3D reconstruction *** first ss-BisAR tomography experiment, conducted using the Chinese Lutan-1 satellite, demonstrates that the correlation coefficient is improved by 0.16 after ephemeris error correction. Moreover, the density and precision of the tomographic point cloud are improved by 13.7% and 12.1%, respectively.

关键词： space-surface sAR tomography orbit error image distortion Lutan-1

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Bifunctional noble-metal-free cocatalyst coating enabling better coupling of photocatalytic CO_(2)reduction and H_(2)O oxidation on direct z-scheme heterojunction

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Nano Research 2024年第6期17卷 5022-5030页

作者： Wei zhao Weihao Mo Yan zhang Lingxuan Hu Yiyi zheng zhulei chen Xiangyue Niu Yuling zhao Lichun Liu shuxian zhong song Bai Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China College of Biological Chemical Sciences and Engineering and Nanotechnology Research InstituteJiaxing UniversityJiaxing 314001China College of Geography and Environmental sciences Zhejiang Normal UniversityJinhua 321004China College of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310058China school of Biological and Chemical Engineering Panzhihua UniversityPanzhihua 617000China

selective loading of spatially separated redox cocatalysts on direct z-scheme heterojunctions holds great promise for advancing the efficiency of artificial photosynthesis,which however is limited to the photodeposition of noble metal cocatalysts and the fabrication of hollow double-shelled semiconductor ***,the co-exposure of discrete cocatalyst and semiconductor increases the product diversity when both the exposed sites of which participate in CO_(2)***,we present a facile and versatile protocol to overcome these limitations via surface coating of z-scheme heterojunctions with bifunctional noble-metal-free *** Cu_(2)O/Fe_(2)O_(3)(CF)as a model heterojunction and layered Ni(OH)_(2)as a model cocatalyst,it is found that Ni(OH)_(2)lying on the surfaces of Cu_(2)O and Fe_(2)O_(3)separately co-catalyzes the CO_(2)reduction and H_(2)O *** experimental and theoretical investigation reveals that the Ni(OH)_(2)outer layer:(i)mitigates the charge recombination in CF and balances their transfer and consumption;(ii)reduces the rate-determining barriers for CO_(2)-to-CO and H_(2)O-to-O_(2)conversion,(iii)suppresses the side proton reduction occurring on CF,and(iv)protects the CF from component *** expected,the redox reactions stoichiometrically proceed,and significantly enhanced photocatalytic activity,selectivity,and stability in CO generation are achieved by the stacked Cu_(2)O/Fe_(2)O_(3)@Ni(OH)_(2)in contrast to *** study demonstrates the significance of the synergy between bifunctional cocatalysts and z-scheme heterojunctions for improving the efficacy of overall redox reactions,opening a fresh avenue for the rational design of artificial photosynthetic systems.

关键词： z-scheme heterojunction bifunctional cocatalyst CO_(2)reduction H_(2)O oxidation stoichiometric redox reaction

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