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Mechanical pressing method for making high-quality perovskite single crystals

Journal of Semiconductors 2023年第11期44卷 1-4页

作者： Chenglin Wang Jie Sun Jiangzhao Chen Cong Chen Liming Ding State Key Laboratory of Reliability and Intelligence of Electrical Equipment School of Materials Science and EngineeringHebei University of TechnologyTianjin 300401China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China Macao Institute of Materials Science and Engineering(MIMSE) Macao University of Science and TechnologyMacao 999078China

Halide perovskites show excellent photovoltaic properties[1−4].However,the preparation of high-quality perovskite crystals remains a great challenge,which limits their *** materials applied to photodetectors mainly include polycrystalline thin films and single *** solution methods are used to prepare polycrystalline thin films,and the films are full of defects such as voids and grain boundaries[5−7].Compared to polycrystalline thin films,perovskite single crystals possess high crystallinity and low defect density[8−10].Photodetectors based on perovskite single crystals exhibit excellent performance[11].However,the size limitation of single crystals hinders their application in photodetectors[12].

关键词： perovskite polycrystalline hinder

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Semi-Supervised Contrastive Domain Adaptation Network for Fault Diagnosis of Rotating Machinery Under Cross-Working Conditions

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IEEE Internet of Things Journal 2025年第12期12卷 21552-21564页

作者： Lu, Xingchi Song, Liuyang Han, Changkun Jiang, Quansheng Xu, Weiyang Wang, Huaqing Beijing University of Chemical Technology College of Mechanical and Electrical Engineering Beijing100029 China Suzhou University of Science and Technology School of Mechanical Engineering Suzhou215009 China Jilin University Key Laboratory of CNC Equipment Reliability Ministry of Education School of Mechanical and Aerospace Engineering Changchun130022 China

Existing domain adaptation (DA) methods, which focus on realizing the class-level alignment for cross-domain features to solve the problem of fuzzy classification boundaries in feature learning process, however, it is difficult to deal with samples located at the classification boundary in this way, resulting in diagnosis performance being limited. To solve the problem, this article proposes a semi-supervised contrastive DA network (SSCDAN) for realizing the cross-working condition rotating machinery fault diagnosis method. Specifically, an in-domain semi-supervised contrastive learning (SSCL) strategy is designed, with the supervision of class information, which guides the discriminative learning of different classes in each domain to eliminate the fuzzy classification boundaries, and facilitates the DA of cross-domain features which utilizes the local maximum mean discrepancy (LMMD). Meanwhile, the negative impact from poor-quality target domain pseudo-labels on SSCL and DA is mitigated by dynamically limiting the associated contrastive learning loss and DA loss gain, and introducing domain adversarial. Finally, the effectiveness of SSCDAN is validated by the ablation and comparison experiments on the Paderborn University (PU) and wind turbine gearbox (WTG) datasets. Compared with deep subdomain adaptation (DSAN), SSCDAN improves the overall average accuracy by 22.43% and 7.36% on the cross-working condition diagnosis tasks of PU and WTG datasets, respectively, and outperforms other popular DA methods. © 2014 IEEE.

关键词： Contrastive Learning

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A hybrid fuel cell for water purification and simultaneously electricity generation

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Frontiers of environmental science & engineering 2023年第1期17卷 121-132页

作者： Yujun Zhou Qinghua Ji Chengzhi Hu Huijuan Liu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China

The development of highly efficient energy conversion technologies to extract energy from wastewater is urgently needed,especially in facing of increasing energy and environment ***,we successfully fabricated a novel hybrid fuel cell with BiOCl-NH_(4)PTA as *** polyoxometalate(NH_(4)PTA)act as the acceptor of photoelectrons and could retard the recombination of photogenerated electrons and holes,which lead to superior photocatalytic *** utilizing BiOCl-NH_(4)PTA as photocatalysts and Pt/C air-cathode,we successfully constructed an electron and mass transfer enhanced photocatalytic hybrid fuel cell with flow-through field(F-HFC).In this novel fuel cell,dyes and biomass could be directly degraded and stable power output could be *** 87%of dyes could be degraded in 30 min irradiation and nearly 100%removed within 90 *** current density could reach up to~267.1μA/cm^(2);with maximum power density(Pmax)of~16.2μW/cm^(2) with Rhodamine B as organic pollutant in *** power densities were 9.0μW/cm^(2),12.2μW/cm^(2),and 13.9μW/cm^(2) when using methyl orange(MO),glucose and starch as substrates,*** hybrid fuel cell with BiOCl-NH_(4)PTA composite fulfills the purpose of decontamination of aqueous organic pollutants and synchronous electricity ***,the novel design cell with separated photodegradation unit and the electricity generation unit could bring potential practical application in water purification and energy recovery from wastewater.

关键词： Flow-through field Hybrid fuel cell Polyoxometalates Water purification Electricity generation

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Multi-functional and multi-scenario applications for MXene aerogels with synergistically enhanced asymmetric modules

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Nano Research 2024年第4期17卷 3359-3368页

作者： Junru Yao Jintang Zhou Feng Yang Guiyu Peng Yijie Liu Zhengjun Yao Fan Wu Haibo Zeng College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information TechnologyNanjing 211100China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

The development of multifunctional materials and synergistic applications of various functions are important conditions for integrated and miniaturized ***,we developed asymmetric MXene/aramid nanofibers/polyimides(AMAP)aerogels with different modules using an integrated molding *** asymmetric modules(layered MXene/aramid nanofibers section and porous MXene/aramid nanofibers/polyimides section)interactions are beneficial for enhanced performances,resulting in low reflection electromagnetic interference(EMI)shielding(specific shielding effectiveness of 2483(dB·cm^(3))/g and a low R-value of 0.0138),high-efficiency infrared radiation(IR)stealth(ultra-low thermal conductivity of 0.045 W/(m·K)and IR emissivity of 0.32 at 3–5μm and 0.28 at 8–14μm),and excellent thermal management performances of insulated Joule ***,these multifunctional AMAP aerogels are suitable for various application scenarios such as personal and building protection against electromagnetic pollution and cold,as well as military equipment protection against infrared detection and EMI.

关键词： multifunctional material electromagnetic interference shielding low reflection infrared radiation stealth thermal insulation Joule heating

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Differential effects of petroleum hydrocarbons on the growing development and physiological characteristics of Ulva species

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environmental science and Pollution Research 2024年第40期31卷 53291-53303页

作者： Liu, Qing Cui, Ruifei Du, Yuxin Shen, Junjie Jin, Cuili Zhou, Xiaojian Marine Science and Technology Institute College of Environmental Science and Engineering Yangzhou University Yangzhou225127 China Jiangsu Key Laboratory of Marine Bioresources and Environment Jiangsu Ocean University Lianyungang222005 China

To compare the different effects of petroleum hydrocarbons on intertidal Ulva macroalgae, three dominant Ulva species (U. prolifera, U. linza, and U. lactuca) were exposed to two water-accommodated fractions (WAFs) of 0# diesel oil and crude oil at three concentration levels. The results indicated that two WAFs had significant concentration effects on the physiological characteristics of Ulva, the toxicity of 0# diesel oil was greater than crude oil, and crude oil had hormesis effect. Exposure of high WAFs concentrations, the growth, pigment, carbohydrate, and protein contents of Ulva were inhibited, while the antioxidant system was activated. In addition, the integrated biomarker response (IBR) indicated that U. prolifera had higher resistance to WAFs than U. linza and U. lactuca. Considering that U. prolifera is the main species of green tide in the Yellow Sea (YS) of China, the comparative effects of WAFs on different development stages of U. prolifera were also explored. The results showed that spore was the most sensitive to WAFs, while adult thalli was the most tolerant. The increased resistance of U. prolifera thalli and the hormesis effect triggered by crude oil may influence the outbreak scale of green tides. This study provides a new perspective for understanding the formation of green tides in the YS. Graphical abstract: (Figure presented.) © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Oil field development

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Three-in-one LaNiO_(3) functionalized separator boosting electrochemical stability and redox kinetics for high-performance Li-S battery

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Journal of Energy Chemistry 2023年第7期82卷 581-591,I0013页

作者： Weiyu Wang Mingxiu Hou Fangqian Han Di Yu Jie Liu Qian Zhang Fengli Yu Lei Wang Maoshuai He State Key Laboratory Base of Eco-chemical Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina Weifang Key Laboratory of Green Processing of Separator for Chemical Power Sources School of Chemistry and EngineeringWeifang Vocational CollegeWeifang 261108ShandongChina Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina

The lithium-sulfur(Li-S)battery,as one of the energy storage devices,has been in the limelight due to its high theoretical energy ***,the poor redox kinetics and the"shuttle effect"of polysulfides severely restrict the use of Li-S batteries in practical ***,a novel bimetallic LaNiO_(3) functional material with high electrical conductivity and catalytic property is prepared to act as a high-efficiency polysulfide shuttling *** three LaNiO_(3) samples with different physical/chemical characteristics are obtained by controlling the calcination *** conjunction with the high electrical conductivity and excellent catalytic properties of the as-prepared materials,the appropriate chemisorption toward polysulfides offers great potential to enhance electrochemical stability for highperformance Li-S ***,the Li-S cell with the separator modified by such functional material gives a specific capacity of 658 mA h g^(-1) after 500 cycles at a high current density of 2 *** with high sulfur loading of 6.05 mg cm^(-2),the Li-S battery still exhibits an areal specific capacity of 2.81 m A h cm^(-2)after 150 *** work paves a new avenue for the rational design of materials for separator modification in high-performance Li-S batteries.

关键词： Li-S battery Functional separator Catalytic property Electrochemical stability Redox kinetics

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The Law of Secondary Electron Multiplication of Aluminum under Different Frequency Microwaves 9

The Law of Secondary Electron Multiplication of Aluminum und...

引用

9th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, MAPE 2022

作者： Shang, Shengfei Yang, Xiaoning Yang, Yong Bi, Yanqiang Wu, Nankai Li, Xiyuan Beijing Institute of Spacecraft Environment Engineering National Key Laboratory of Science and Technology on Reliability and Environmental Engineering Beijing China

ISBN: (数字)9781665427753

ISBN: (纸本)9781665427753

In this paper, the discharge phenomena of aluminum materials under the action of strong electromagnetic waves are investigated. The electron multiplication phenomenon of aluminum surface under different amplitude of microwave at 1GHz-300GHz was calculated using 1D3V simulation framework. It shows that the easiest discharge interval of aluminum is about 0.05MV/m-8.5MV/m at 1GHz and about 20MV/m-1700MV/m at 300GHz, and the easiest discharge interval increases with the frequency and follows nearly a linear power law. © 2022 IEEE.

关键词： Aluminum

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Lightweight Si_(3)N_(4)@SiO_(2) ceramic foam for thermal insulation and electromagnetic wave transparency

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Nano Research 2024年第5期17卷 4298-4306页

作者： Zongwei Tong Xiangjie Yan Yuexiang Wang Kexun Li Weihai Ma China-Blarus Belt and Road Joint Laboratory on Electromagnetic Environment Effect the 33rd Research Institute of ChinaElectronics Technology Group CorporationTaiyuan 030032China Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education School of Material Science and EngineeringTianjin UniversityTianjin 300072China Department of Materials Science and Engineering Jinzhong UniversityJinzhong 030619China

Increasing porosity is one of the most direct ways to improve the thermal insulation and dielectric properties of *** now,many wet methods for preparing Si_(3)N_(4) ceramic foams usually face the problems of complex rheology,long period,and expensive cost,and the reported pore sizes of Si_(3)N_(4) ceramic foams are typically micron-grade,resulting in a lack of competitiveness in thermal insulation and wave-transparent *** this paper,the Si_(3)N_(4)@SiO_(2) ceramic foams were prepared using an efficient dry-method,which combined three processes of low temperature chemical vapor deposition(LTCVD),template,and isostatic *** method has the advantages of simple operation and short preparation period,and can realize near-net size molding and mass *** addition,the evolution mechanisms of honeycomb microstructure and composition of Si_(3)N_(4)@SiO_(2) ceramic foam during sintering were studied by chemical reaction *** as-prepared Si_(3)N_(4)@SiO_(2) ceramic foam possesses low density(0.377 g·cm^(-3)),high compressive strength(7.5 MPa),low thermal conductivity(0.0808 W·m^(-1)·K^(-1)),and excellent dielectric properties(ε<1.32,tanδ<0.009)in the frequency range of 8-18 GHz,and its maximum working temperature in air can reach up to 1100℃.It will be recommended to be applied in the interlayer of Si_(3)N_(4) ceramic radome to improve its thermal insulation and electromagnetic wave transparency performances.

关键词： silicon nitride ceramic foam honeycomb microstructure dielectric properties thermal insulation

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Characteristics of Antarctic aerosol composition during the Australian fires of 2019-2020

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Advances in Polar science 2024年第4期35卷 421-437页

作者： CHEN Afeng WANG Longquan LIU Hongwei YUE Fange XIE Zhouqing Institute of Polar Environment&Anhui Key Laboratory of Polar Environment and Global Change Department of Environmental Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Engineering and Technological Research Centre of National Disaster Relief Equipment Army Logistics AcademyChongqing 401331China State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China

During the 36th Chinese National Antarctic Research Expedition,aerosol samples were gathered from the Ross Sea in Antarctic to assess the climatic impact of the Australian fires that occurred in *** chemical compositions,including levoglucosan(Lev)and its isomers,galactosan(Gan)and mannosan(Man),were *** component analysis helped identify the potential sources of these chemical *** combining backward trajectories with the ratios of CLev/CMan and CMan/CGan,it was further inferred that Australia might be the potential source region for biomass *** radiative forcing resulting from biomass burning was evaluated using the Santa Barbara DISORT Atmospheric Radiative Transfer(SBDART)model,which revealed that black carbon emitted from biomass burning could slightly warm the atmosphere(+0.52 W·m^(-2))while causing slightly cooling at the surface(-0.73 W·m^(-2))and the top of the atmosphere(-0.22 W·m^(-2))over the Ross Sea.

关键词： Australian fires biomass burning aerosol composition climate effect Ross Sea

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Rare earth lanthanum pinning effect for corrosion resistance ultraefficient microwave absorption FeCo@rGO composites

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Journal of Materials science & technology 2024年第10期177卷 181-190页

作者： Junru Yao Jintang Zhou Lu Lu Feng Yang Zhengjun Yao Bo Ouyang Erjun Kan Yuxin Zuo Renchao Che Fan Wu College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Ministry of Industry and Information Technology Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics)Nanjing 211100China MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing School of ScienceNanjing University of Science and TechnologyNanjing 210094China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsDepartment of Materials ScienceFudan UniversityShanghai 200438China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

Magnetic metal absorbers exhibit remarkable microwave absorption ***,their practical application is severely limited due to their susceptibility to corrosion,particularly in marine *** address this challenge,we propose a novel approach involving the modification and control of FeCo/rGO microwave absorbers using rare earth lanthanum(La).This strategy aims to achieve both high-performance microwave absorption and enhanced resistance to marine *** this study,we employ a La_(2)O_(3) modifying control strategy to refine the FeCo magnetic particles and coat them with CoFe_(2)O_(4) on the surface,leveraging the pinning effect of in situ generated La_(2)O_(3) .This process enhances the interface polarization of the absorbers,thereby improving their electromagnetic performance and ma-rine corrosion ***,the La_(2)O_(3) modified FeCo@rGO composites exhibit broadband ab-sorption,covering a wide frequency range of 6.11 GHz at 1.55 ***,the electromagnetic proper-ties of the La_(2)O_(3) modified FeCo@rGO absorbers remain stable even after prolonged exposure to a 3.5 wt% NaCI solution,simulating marine conditions,for at least 15 ***,we perform first-principle calculations on FeCo and FeCo-O to validate the corrosion resistance of the La_(2)O_(3) modified FeCo@rGO composites at the atomic *** comprehensive investigation explores the control of rare earth lan-thanum modification on the size of magnetic metal particles,enabling efficient electromagnetic wave absorption and marine corrosion *** results of this study provide a novel and facile strategy for the control of microwave absorbers,offering promising prospects for future research and development in this field.

关键词： Rare earth lanthanum FeCo@rGO Microwave absorption Marine corrosion resistance

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