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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

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

重症加强护理病房重症感染患者病原菌分布及延长亚胺培南输注时间的疗效观察

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中国合理用药探索 2022年第8期19卷 85-90页

作者：李红梅李元垒郭珊荆桃芬许娜新乡市中心医院新乡医学院第四临床学院感染预防与控制科新乡453000 新乡市中心医院新乡医学院第四临床学院重症医学科新乡453000 新乡市中心医院新乡医学院第四临床学院检验科新乡453000

目的:分析重症加强护理病房(ICU)重症感染患者病原菌分布情况,并探讨延长亚胺培南输注时间的治疗效果。方法:选取2021年5月~2022年5月本院收治的96例ICU重症感染患者为研究对象,入院后对其进行病原菌的分离与鉴定,分析病原菌的分布情况... 详细信息

目的:分析重症加强护理病房(ICU)重症感染患者病原菌分布情况,并探讨延长亚胺培南输注时间的治疗效果。方法:选取2021年5月~2022年5月本院收治的96例ICU重症感染患者为研究对象,入院后对其进行病原菌的分离与鉴定,分析病原菌的分布情况。依据入院建档单双号分为对照组和观察组,每组48例。两组均采用相同浓度的注射用亚胺培南西司他丁钠进行治疗,对照组给予常规输注时间治疗(30min),观察组给予延长输注时间治疗(3h),两组均连续治疗1周。比较两组治疗前后白细胞介素-6(IL-6)、降钙素原(PCT)、肿瘤坏死因子-α(TNF-α)水平,比较两组主要病原菌清除率、临床疗效及不良反应发生率。结果:96例ICU重症感染患者中共检出病原菌126株,包括革兰阴性菌81株(64.29%)、革兰阳性菌41株(32.54%)、真菌4株(3.17%)。其中,革兰阴性菌以铜绿假单胞菌(23株,18.25%)、肺炎克雷伯菌(21株,16.67%)、鲍曼不动杆菌(18株,14.29%)为主;革兰阳性菌以金黄色葡萄球菌(17株,13.49%)、肠球菌属(12株,9.52%)为主;真菌以白假丝酵母菌(4株,3.17%)为主。治疗后两组IL-6、PCT、TNF-α水平均降低,且观察组低于对照组(P0.05)。结论:ICU重症感染患者病原菌主要以铜绿假单胞菌、肺炎克雷伯菌、鲍曼不动杆菌等革兰阴性菌以及金黄色葡萄球菌、肠球菌属等革兰阳性菌为主,建议临床治疗ICU重症感染患者时可适当延长亚胺培南输注时间,不仅可有效改善炎症,还能提高对病原菌的清除率,且疗效优于常规时间输注,安全性较高。

关键词：重症加强护理病房重症感染病原菌分布亚胺培南输注时间病原菌清除率疗效

Transition metal-free tunable synthesis of 3-(trifluoromethylthio)and 3-trifluoromethylsulfinyl chromones via domino C-H functionalization and chromone annulation of enaminones

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Chinese Chemical Letters 2024年第11期35卷 340-343页

作者： tao Zhou jing Zhou Yunyun Liu Jie-Ping Wan fen-Er Chen College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang 330022China Engineering Center of Catalysis and Synthesis for Chiral Molecules Fudan UniversityShanghai 200433China

The new reactions between o-hydroxyphenyl enaminones and Langlois reagent(CF_(3)SO_(2)Na)for the tunable synthesis of 3-(trifluoromethylthio)chromones and 3-trifluoromethylsulfinyl chromones are reported *** type of reactions proceed under transition metal-free *** addition,the conditions for the synthesis of 3-trifluoromethylsulfinyl chromones have also been found to be applicable for the synthesis of 3-alkyl/arylsulfinyl chromones.

关键词： Enaminone C-H functinalizaiton Tunable synthesis Trifluoromethylthiolation Trifluoromethylsulfination Transition metal-free Sulfur functionalized chromones

Oxidation behavior of in-situ Al_2O_3/TiAl composites at 900°C in static air

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 339-344页

作者： tao-tao Ai fen Wang Xiao-ming feng Department of Materials Science and Engineering Shaanxi University of Technology Hanzhong 723003 China School of Materials Science and Engineering Shaanxi University of Science and Technology Xi＇an 710021 China

In-situ Al2O3/TiAl composites were successfully synthesized from the starting powders of Ti, Al, TiO2 and Nb2O5. The oxidation behavior of the composites at 900℃ in static air was investigated. The results indicate that the composite samples present a much lower oxidation mass gain. Under long-time intensive oxidation exposure, the formed oxide scale is multi-layer. The formation of the outer TiO2 layer is fine and dense, the internal Al2O3 scale has good adhesiveness with the outer TiO2 scale, and the TiO2＋Al2O3 mixed layer forming the protective oxide scale is favorable for the improvement of oxidation resistance. It is believed that the incorporation of Al2O3 particulates into the metal matrix decreases the coefficient of thermal expansion of the substrate, and forms a local three-dimensional network structure that can hold the oxide scale. The formation of the oxide scale with finer particle size, stronger adherence, less micro-defects and slower growth rate can contribute to the improvement of oxidation resistance. Nb element plays an important role in reducing the internal oxidation action of the materials, restraining the growth of TiO2 crystals and promoting the stable formation of the Al2O3-riched layer, which is beneficial to improve the oxidation properties.

关键词： intermetallic matrix composites alumina oxidation resistance scale spallation high temperature

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小学数学跨学科主题学习表现性评价的策略

教学与管理 2025年第2期 64-67页

作者：庄惠芬江苏省常州市武进区星河实验小学江苏常州213161

数学跨学科主题学习是发展儿童学科核心素养的重要途径。在数学跨学科主题学习中实施表现性评价,须把握表现性评价的情境性、开放性、多元化等特点,用学习关联评价,用评价促进学习,探索“嵌合式”的表现性评价、“整合式”的表现性评价... 详细信息

数学跨学科主题学习是发展儿童学科核心素养的重要途径。在数学跨学科主题学习中实施表现性评价,须把握表现性评价的情境性、开放性、多元化等特点,用学习关联评价,用评价促进学习,探索“嵌合式”的表现性评价、“整合式”的表现性评价、“循证式”的表现性评价,实现“教—学—评”一体化,指向全面育人。

关键词：小学数学主题式学习表现性评价综合与实践

Multiscale structural engineering of atomically dispersed fen4 electrocatalyst for proton exchange membrane fuel cells

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Journal of Energy Chemistry 2021年第7期30卷 629-635页

作者： Ruguang Wang Yuanyuan Yang Yang Zhao Liujing Yang Pengfei Yin jing Mao tao Ling Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin 300072China Department of Chemistry City University of Hong KongKowloonHong KongChina

Atomically dispersed iron-nitrogen-carbon(Fe-N-C) catalysts have emerged as the most promising alternative to the expensive Pt-based catalysts for the oxygen reduction reaction(ORR) in proton exchange membrane fuel cells(PEMFCs),however suffer from low site density of active Fe-N4 moiety and limited mass transport during the catalytic *** address these challenges,we report a three-dimensional(3D) metal-organic frameworks(MOF)-derived Fe-N-C single-atom *** this well-designed Fe-N-C catalyst,the micro-scale interconnected skeleton,the nano-scale ordered pores and the atomic-scale abundant carbon edge defects inside the skeleton significantly enhance the site density of active Fe-N4 moiety,thus improving the Fe utilization in the final ***,the combination of the above mentioned micro-and nano-scale structures greatly facilitates the mass transport in the 3D Fe-N-C ***,the multiscale engineered Fe-N-C single-atom catalyst achieves excellent ORR performance under acidic condition and affords a significantly enhanced current density and power density in *** findings may open new opportunities for the rational design of fen-C catalysts through multiscale structural engineering.

关键词： Fe–N–C catalyst Fe-N4 Proton exchange membrane fuel cells Oxygen reduction reaction Single-atom catalyst

Extended State to Localization in Random Aperiodic Chains

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Communications in Theoretical Physics 2006年第5X期46卷 929-934页

作者： GAO Hui-fen tao Rui-Bao Department of Physics Fudan University Shanghai 200433 China Chinese Center of Advanced Science and Technology (World Laboratory) P.O. Box 8730 Beijing 100080 China

The electronic states in Thus-Morse chain （TMC） and generalized Fibonacci chain （GFC） are studied by solving eigenequation and using transfer matrix method. Two model Hamiltonians are studied. One contains the nearest neighbor （n.n.） hopping terms only and the other has additionally next nearest neighbor （n.n.n.） hopping terms. Based on the transfer matrix method, a criterion of transition from the extended to the localized states is suggested for CFC and TMC. The numerical calculation shows the existence of both extended and localized states in pure aperiodic system. A random potential is introduced to the diagonal term of the Hamiltonian and then the extended states are always changed to be localized. The exponents related to the localization length as a function of randomness are calculated. For different kinds of aperiodic chain, the critical value of randomness for the transition from extended to the localized states are found to be zero, consistent with the case of ordinary one-dimensional systems.

关键词： localization transfer matrix method localized length

PAHs in aquatic sediment in Hangzhou, China: Analytical methods, pollution pattern, risk assessment and sources

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Journal of Environmental Sciences 2005年第5期17卷 748-755页

作者： ZHU Li-zhong CAI Xue-fen WANG jing Department of Environmental Science Zhejiang University Hangzhou 310028 China Women＇s Hospital School of Medicine Zhejiang University Hangzhou 310006 China Zhejiang Provincial Environmental Monitoring Centre Hangzhou 310012 China

Eleven surface sediment samples, from Hangzhou section of Qiantang River and jinghang Canal, west Lake the inland river were collected to investigate 17 polycycUc aromatic hydrocarbons（PAHs） pollution in aquatic sediments of Hangzhou. Accelerated solvent extraction（ASE） was used to extract PAHs from sediments with satisfactory recoveries. It was found that the total PAHs in the sediments ranged from 308.4 to 3037 ng/g dw, and PAHs pollution in sediments from jinghang Canal were the heaviest. Lowest effect level（LEL） and severe effect level （SEL） sediment quality guidelines were introduced to perform risk assessment for PAHs pollution in aquatic sediments. Only one sample in jinghang Canal had adverse impact on benthic organism. 2-3 ring PAHs had a noticeable contribution to total PAHs, especially NA, PHEN. A quantity method was used to determine the major source, the results showed petroleum origin was the chief source to PAHs pollution in all sediments with the exception of sediments from jinghang Canal where combustion sources had a larger contribution.

关键词： PAHs ASE sediment source risk assessment