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Micro-strain regulation strategy to stabilize perovskite lattice based on the categories and impact of strain on perovskite solar cells

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Journal of Energy Chemistry 2025年第1期100卷 578-604页

作者： Caixia Li Wenwu liu Shiji Da Lingbin Kong fen.Ran State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology School of Materials Science and Engineering Lanzhou University of Technology

Photovoltaic metal halide perovskite solar cells(PSCs) convert light to electricity more efficiently than crystalline silicon cells, and the cost of materials used to make them is lower than that of silicon *** efficiency is not a core issue affecting the application of perovskite solar cells in special *** present, stability is the major technical encounters that hinders its further commercial development. Microstrain in PSCs is currently a significant factor responsible for the device's instability. Strain-induced ion migration is widely believed to accelerate perovskite degradation even when external stimuli are ***, it is imperative to study strain to enhance the stability of PSCs. This paper reviews recent developments to understand strain's origin and effect mechanisms on performance of PSCs, including ion migration,failure behavior, defect formation, and its effect on photoelectric properties, stability, and ***, several well-known strain management strategies are systematically introduced based on the strain effect mechanism and strain engineering on the film, providing more clues for further preparation with increased stability. The manipulation of external physical strain applied from films to entire devices has been extensively studied. Furthermore, recommendations for future research directions and chemical approaches have been provided. It is emphasized that strain engineering plays a crucial role in improving the efficiency and longevity of PSCs. Tensile strain causes rapid degradation, while moderate compressive strain and external strain control could improve properties and stability. Efforts should focus on controlling compressive strain to mitigate residual tensile strain and introducing it in a controlled manner. Future research endeavors may focus on exploring these pathways to improve the efficiency and lifespan of PSCs.

关键词： Halide perovskite solar cells Strain origins Strain effects Strain management

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Stochastic Augmented-Based Dual-Teaching for Semi-Supervised Medical Image Segmentation

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Computers, Materials & Continua 2025年第1期82卷 543-560页

作者： Hengyang liu Yang Yuan Pengcheng Ren Chengyun Song fen.Luo School of Computer Science and Engineering Chongqing University of TechnologyChongqing400054China College of Artificial Intelligence Chongqing Technology and Business UniversityChongqing400067China

Existing semi-supervisedmedical image segmentation algorithms use copy-paste data augmentation to correct the labeled-unlabeled data distribution ***,current copy-paste methods have three limitations:(1)training the model solely with copy-paste mixed pictures from labeled and unlabeled input loses a lot of labeled information;(2)low-quality pseudo-labels can cause confirmation bias in pseudo-supervised learning on unlabeled data;(3)the segmentation performance in low-contrast and local regions is less than *** design a Stochastic Augmentation-Based Dual-Teaching Auxiliary Training Strategy(SADT),which enhances feature diversity and learns high-quality features to overcome these *** be more precise,SADT trains the Student Network by using pseudo-label-based training from Teacher Network 1 and supervised learning with labeled data,which prevents the loss of rare labeled *** introduce a bi-directional copy-pastemask with progressive high-entropy filtering to reduce data distribution disparities and mitigate confirmation bias in *** the mixed images,Deep-Shallow Spatial Contrastive Learning(DSSCL)is proposed in the feature spaces of Teacher Network 2 and the Student Network to improve the segmentation capabilities in low-contrast and local *** this procedure,the features retrieved by the Student Network are subjected to a random feature perturbation *** two openly available datasets,extensive trials show that our proposed SADT performs much better than the state-ofthe-art semi-supervised medical segmentation *** only 10%of the labeled data for training,SADT was able to acquire a Dice score of 90.10%on the ACDC(Automatic Cardiac Diagnosis Challenge)dataset.

关键词： Semi-supervised medical image segmentation contrastive learning stochastic augmented

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Atomically precise nickel-sulfur clusters for efficient electrochemical 2,5-hydroxymethylfurfural oxidation

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Nano Research 2025年第1期18卷 140-148页

作者： fen.Wang Lu-Yu liu Sha-Sha Cui Ting-Ting Li Xiao-Meng Yang Zhijuan liu Yanyong Wang Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster MaterialsGreen Catalysis Centerand College of ChemistryZhengzhou UniversityZhengzhou 450001China State Key Laboratory of Chem/Bio-sensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China

Nickel sulfide exhibits excellent catalytic activity in the electrochemical 2,5-hydroxymethylfurfural oxidation reaction(HMFOR).However,due to the polydispersity of nanoparticles,it is difficult to establish a clear structure-activity relationship at the atomic *** this work,we have successfully synthesized atomically precise Ni_(6)(PET)_(12)and Ni_(4)(PET)_(8)clusters(PET:2-phenylethanethiol)for ***^(2+)and S_(2)-with atomic ratio of 1:2 was mainly existed in Ni_(6)(PET)_(12)and Ni_(4)(PET)_(8)to form Ni-S *** electrochemical test results have suggested both Ni_(6)(PET)_(12)and Ni_(4)(PET)_(8)displayed outstanding electrocatalytic ability for *** Ni_(6)(PET)_(12)exhibited better electrocatalytic ability than Ni_(4)(PET)_(8)with higher current density,lower overpotential and faster reaction *** superior electrochemical ability of Ni_(6)(PET)_(12)may be due to the enhanced adsorption towards HMF molecule with strong interaction towards hydroxyl group and furan ***,it found that the Ni^(2+)species in Ni_(6)(PET)_(12)could rapidly oxidized into Ni^(3+)species,which could spontaneously capture electron and proton from HMF for *** theoretical calculation demonstrated that the Ni_(6)(PET)_(12)process lower free energy barrier than Ni_(4)(PET)_(8)to display excellent electrocatalytic *** work is of great significance for designing efficient electrocatalysts for HMFOR.

关键词： atomically precise nickel nanoclusters 2 5-hydroxymethylfurfural electro-oxidation Ni3+species

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Triality and Dual Equivalence Between Dirac Field and Topologically Massive Gauge Field

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Communications in Theoretical Physics 2006年第3X期46卷 481-492页

作者： liu Yu-fen Institute of Theoretical Physics Academia Sinica Beijing 100080 China

It is proved that there exists a vector representation of Dirac＇s spinor field and. in one sense it is equivalent to biquaternion （i.e. complexified quaternion） representation. This can be considered as a generalization of Cartan＇s idea of triality to Dirac＇s spinors. In the vector representation the first-order Dirac Lagrangian is dual-equivalent to the two-order Lagrangian of topologically massive gauge field. The potential field which corresponds to the Dirac field is obta/ned by using master （or parent） action approach. The novel gauge field is self-dual and contains both anti-symmetric Lee and symmetric Jordan structure.

关键词： triality biquatermion self-dual

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Selenium-doped cathode materials with polyaniline skeleton for lithium-organosulfur batteries

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Journal of Energy Chemistry 2023年第4期79卷 148-157页

作者： Rong Zou Wenwu liu fen.Ran State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals School of Materials Science and EngineeringLanzhou University of TechnologyLanzhou 730050GansuChina

Sulfur-containing polymer(SCP)is considered as an outstanding cathode material for lithium-sulfur ***,undesirable soluble polysulfides may shuttle in electrolyte,concluding long-chain Li_(2)S_(n)(n>4)and short-chain Li2Sn(n≤4),as well as the sluggish conversion kinetics are yet to be solved to enhance the performance of lithium-sulfur *** Se-doped sulfurized polyaniline with adjusted sulfur-chain-S_(x)-(x≤6)contribute to ensure the absence of long-chain polysulfides,and the skeleton with quinoid imine can endow strongly adsorption towards short-chain polysulfides by the reversible transition between deprotonated/protonated imine(-NH^(+)=and-N=),which offer double insurance against suppressing“shuttle effect”.Furthermore,Se atoms are doped into sulfurized polysulfides to accelerate the redox conversion and take a frontier orbital theory-oriented view into catalytic ***-doped sulfurized polyaniline as active materials for lithium-organosulfur batteries delivers good electrochemical performance,including high rate,reversible specific capacity(680 mA h g^(-1)at 0.1 A g^(-1)),and lower capacity decay rate only of 0.15%with near 100%coulomb efficiency during long-term *** work provides a valuable guiding ideology and promising solution for the chemistry-oriented structure design and practical application for lithium-organosulfur batteries.

关键词： Lithium-organosulfur batteries Selenium-doped Cathode materials Sulfur-containing polymer Frontier orbital theory

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Energy Storage Mechanism of Vanadium Nitride via Intercalating Different Atomic Radius for Expanding Interplanar Spacing

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Energy & Environmental Materials 2022年第2期5卷 565-571页

作者： Ying liu Lingyang liu Long Kang fen.Ran State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals School of Material Science and EngineeringLanzhou University of TechnologyLanzhou 730050China Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059China

As a promising anode material in supercapacitors,vanadium nitride has been widely concerned due to its ultra-high theoretical specific ***,its routine test capacitance value is still far from the theoretical value and its energy storage mechanism is *** order to solve these two key problems,here we prepare interplanar spacing expanded vanadium nitride materials with different impurity atoms intercalation from two anionic precursors of vanadium-based metal organic frameworks with different functional *** obtained vanadium nitride reaches a higher specific capacitance;and further,through ex situ X-Ray diffraction and in situ Raman,the charge storage of vanadium nitride is contributed by two processes:the first benefit is from the K^(+) de/intercalation in the interplanar spacing,and the other one is derived from the redox reaction with OH−by adsorption on ***,both of the first principle calculation and extended experiments support this *** believe that such detailed research on the energy storage mechanism can provide a clear idea for the application of metal nitrides in supercapacitors and other energy storage devices.

关键词： electrode materials energy storage mechanism supercapacitors vanadium nitride V-MOFs

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不同加工方式对体外模拟胃肠消化香菇活性物质含量及活性的影响

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食品科学 2025年第2期46卷 183-192页

作者：姚芬刘红霞范秀芝史德芳殷朝敏高虹张玉姚望湖北省农业科学院农产品加工与核农技术研究所湖北武汉430064 湖北工业大学生命科学与健康工程学院湖北武汉430068 武汉市储备粮保障中心湖北武汉430021

为研究不同加工方式和处理时间对香菇体外模拟胃肠消化后活性物质含量及体外活性的影响,采用蒸制、煮制、空气炸和烤箱烤制4种方式处理香菇,通过模拟体外胃肠消化后测定消化液中总酚、总黄酮、粗多糖和香菇嘌呤含量及其体外抗氧化、降... 详细信息

为研究不同加工方式和处理时间对香菇体外模拟胃肠消化后活性物质含量及体外活性的影响,采用蒸制、煮制、空气炸和烤箱烤制4种方式处理香菇,通过模拟体外胃肠消化后测定消化液中总酚、总黄酮、粗多糖和香菇嘌呤含量及其体外抗氧化、降血脂和降血糖活性,并对消化液的体外活性和活性物质含量相关性进行分析。结果表明,消化前,与蒸制、煮制和空气炸处理相比,烤箱烤制更利于香菇中4种活性物质的保留,其中烤制5 min时总酚、总黄酮和粗多糖的含量和烤制15 min时香菇嘌呤的含量相对较高,分别为(222.13±3.57)mg/g、(4.49±0.06)mg/g、(5.57±0.28)g/100 g和(551.31±3.76)mg/100 g。经体外胃肠消化后,烤箱烤制香菇活性物质释放量相对较高,其次为空气炸。除烤箱烤制香菇总黄酮的释放量随烤制时间延长而降低外,其余活性物质释放量与加工时长无明显相关性。蒸制处理后香菇肠消化液的体外活性相对较高,其中,蒸制20 min的香菇肠消化液1,1-二苯基-2-三硝基苯肼自由基清除率和蒸制10 min的2,2′-联氮-双(3-乙基苯并噻唑啉-6-磺酸)(2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid),ABTS)阳离子自由基清除率最高(P0.05);蒸制10 min时肠消化液的胰脂肪酶抑制活性相对较强(P>0.05),为(49.42±2.32)%。相关性分析发现,胃消化液的α-葡萄糖苷酶抑制活性与其总酚(P<0.01)和香菇嘌呤(P<0.05)含量呈显著正相关,ABTS阳离子自由基抑制率与其总酚(P<0.05)和粗多糖(P<0.01)含量呈显著正相关;而肠消化液的胰脂肪酶抑制活性与4种活性物质含量均呈极显著负相关(P<0.01)。综上可以看出烤制更有利于活性物质的保留和消化释放,而蒸制更利于改善香菇肠消化液的体外活性。本研究为香菇科学合理的加工提供了指导。

关键词：香菇加工方式总酚总黄酮粗多糖香菇嘌呤体外活性

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Pade Expansion and Nucleon-Nucleon Scattering in Coupled Channels

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Communications in Theoretical Physics 2009年第7期52卷 115-118页

作者： liu Dan YANG Ji-fen Department of Physics East China Normal University Shanghai 200062 China

We extend our Pade-aided analysis of the nonperturbative renormalization of nucleon-nucleon scatteringto the case of coupled channels.

关键词： nucleon-nucleon scattering nonperturbative renormalization effective field theories

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Robust Control Strategy for the Speed Control of Brushless DC Motor

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Journal of Harbin Institute of Technology(New Series) 2013年第2期20卷 90-94页

作者： Zhi liu Bai-fen.liu School of Traffic and Transportation Engineering Central South University School of Electrical and Electronic Engineering East China Jiaotong University

Brushless DC motor ( BLDCM) speed servo system is multivariable,nonlinear and strong coupling. The parameter variation, the cogging torque and the load disturbance easily influence its performance. Therefore,it is difficult to achieve superior performance by using the conventional PID controller. To solve the deficiency,the paper represents the algorithm of active-disturbance rejection control ( ADRC) based on back-propagation ( BP) neural network. The ADRC is independent on accurate system and its extended-state observer can estimate the disturbance of the system accurately. However,the parameters of Nonlinear Feedback ( NF) in ADRC are difficult to obtain. So in this paper,these parameters are self-turned by the BP neural network. The simulation and experiment results indicate that the ADRC based on BP neural network can improve the performances of the servo system in rapidity,control accuracy,adaptability and robustness.

关键词： brushless DC motor ( BLDCM) BP ( back propagation algorithms) ADRC ( active-disturbance rejection control) parameters self-turning.

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Microstructure and mechanical behavior of Inconel 625 alloy processed by selective laser melting at high temperature up to 1000℃

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Rare Metals 2020年第10期39卷 1181-1189页

作者： Xiao-An Hu Gao-Le Zhao fen.Cheng liu Wei-Xiong liu School of Aircraft Engineering Nanchang Hangkong UniversityNanchang 330063China Airbreathing Hypersonic Technology Research Center China Aerodynamic Research and Development CenterMianyang 621000China

Mechanical behavior of Inconel 625 alloy manufactured by selective laser melting(SLM)was experimentally *** tests were performed at various temperatures(20,540,760,815,870,950 and 1000℃).The microstructures and fracture mechanism were investigated using optical microscopy(OM),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The SLM Inconel 625 exhibits excellent plastic deformation at low ***,significant embrittlement for the SLM Inconel 625 was found at elevated temperatures compared to low temperature and traditional forging *** microstructure studies,the non-homogenous microstructure is a key factor causing the intergranular cracking mode at elevated ***,carbides were found to form at the grain boundary at elevated *** carbides could weaken the strength of the grain boundary at elevated temperatures,which decreased the tensile strength and ductility of the alloy processed by SLM.

关键词： Nickel-based superalloy Selective laser melting Embrittlement High temperature Microstructure

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