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Two birds with one stone:Functionalized wood composites for efficient photocatalytic hydrogen production and solar water evaporation

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Chinese Chemical Letters 2024年第9期35卷 392-397页

作者： Deqi fan Yicheng Tang Yemei Liao Yan Mi Yi lu Xiaofei yang College of Chemical Engineering Nanjing Forestry UniversityNanjing 210037China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of ScienceNanjing Forestry UniversityNanjing 210037China Key Laboratory of Chemistry and Engineering of Forest Products State Ethnic Affairs CommissionGuangxi Key Laboratory of Chemistry and Engineering of Forest ProductsGuangxi Minzu UniversityNanning 530006China

Maximizing solar energy utilization is a persistent challenge in photo catalysis,which determines sustainable solar-driven photocatalytic *** thermal-coupled photo catalysis is considered as a promising solution to tackle the issues of sustainable energy scarcity and environmental pollution by harvesting the full-spectrum solar ***,a highly efficient photo thermal-accelerated photo catalysis system is elaborately established,in which the assembled carbonized stick/Nb_(2)C MXene evaporator can heat water into vapor and the integrated g-C_(3)N_(4)photocatalyst further enables high-efficiency photocatalytic hydrogen *** designed hyperboloid wood-based architecture possesses a multiphase interface of water steam/catalyst/hydrogen to reduce the transport resistance of hydrogen gas in liquid and ultimately maximize the output of hydrogen ***,this coupled photothermal-photocatalytic system achieves a stable solar evaporation rate of 2.16 kg m^(-1)h^(-1)under one sun irradiation and highly efficient hydrogen-evolving rate of 3096μmol g^(-1)h^(-1).This work paves a way to explore the improvement of photocatalytic hydrogen production by synergic photothermal effect for potential applications in renewable solar energy utilization and hydrogen production.

关键词： Photocatalysis Photothermal Nb_(2)C MXene g-C_(3)N_(4) Wood

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Age of Information Based User Scheduling and Data Assignment in Multi-User Mobile Edge Computing Networks:An Online Algorithm

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China Communications 2024年第5期21卷 153-165页

作者： Ge Yiyang Xiong Ke Dong Rui lu yang fan Pingyi Qu Gang School of Computer and Information Technology Beijing Jiaotong UniversityBeijing 100044China Engineering Research Center of Network Management Technology for High Speed Railway of Ministry of Education Beijing 100044China Beijing Engineering Research Center of High-speed Railway Broadband Mobile Communications Beijing 100044China Department of Electronic Engineering Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China Department of Electrical and Computer Engineering College ParkMarylandUSA

This paper investigates the age of information(AoI)-based multi-user mobile edge computing(MEC)network with partial offloading *** weighted sum AoI(WSA)is first analyzed and derived,and then a WSA minimization problem is formulated by jointly optimizing the user scheduling and data *** to the non-analytic expression of the WSA *** optimization variables and the unknowability of future network information,the problem cannot be solved with known solution ***,an online Joint Partial Offloading and User Scheduling Optimization(JPOUSO)algorithm is proposed by transforming the original problem into a single-slot data assignment subproblem and a single-slot user scheduling sub-problem and solving the two sub-problems *** analyze the computational complexity of the presented JPO-USO algorithm,which is of O(N),with N being the number of *** results show that the proposed JPO-USO algorithm is able to achieve better AoI performance compared with various baseline *** is shown that both the user’s data assignment and the user’s AoI should be jointly taken into account to decrease the system WSA when scheduling users.

关键词： age of information(aoi) mobile edge computing(mec) user scheduling

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Fluorine-containing polyimide nanofiber membranes for durable and anti-aging daytime radiative cooling

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Journal of Materials Science & Technology 2024年第12期179卷 166-173页

作者： Qiaoran Zhang Tiantian Xue yang lu Lei Ma Dingyi Yu Tianxi Liu Wei fan Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Personal daytime radiative cooling(PDRC)materials have high sunlight reflection and high selective emis-sivity to outer space in the main atmospheric window,demonstrating huge potential in energy-saving for sustainable ***,polymer-based membranes for radiative cooling have been widely re-ported,due to their easy processing,low cost,and unique optical ***,the desired high sunlight reflectance of PDRC materials is easily dampened by environmental aging,high temperature,and ultraviolet(UV)irradiation,resulting in reduced cooling performance for most polymers,adverse to large-scale practical *** this work,we demonstrate a novel polyimide nanofiber(PINF)membrane with a fluorine-containing structure via typical electrospinning *** resultant PINF membrane exhibits high sunlight reflectance,UV resistance,and excellent thermal stability,rendering anti-aging day-time radiative *** sunlight reflectance of PINF membranes could maintain constant in the aging test for continuous 720 h under outdoor solar irradiation,exhibiting durable and long-term personal day-time radiative cooling performance.

关键词： Polyimide Nanofiber UV resistance Daytime radiative cooling

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Advances in MXene Films:Synthesis,Assembly,and Applications

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Transactions of Tianjin University 2021年第3期27卷 217-247页

作者： Xiaohua Li Feitian Ran fan yang Jun Long lu Shao MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage State Key Laboratory of Urban Water Resource and Environment(SKLUWRE)School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150000China

A growing family of two-dimensional(2D)transition metal carbides or nitrides,known as MXenes,have received increasing attention because of their unique properties,such as metallic conductivity and good *** studies on MXenes have been widely pursued,given the composition diversity of the parent MAX *** review focuses on MXene fi lms,an important form of MXene-based materials for practical *** summarized the synthesis methods of MXenes,focusing on emerging synthesis strategies and reaction *** advanced assembly technologies of MXene fi lms,including vacuum-assisted fi ltration,spin-coating methods,and several other approaches,were then ***,recent progress in the applications of MXene fi lms in electrochemical energy storage,membrane separation,electromagnetic shielding fi elds,and burgeoning areas,as well as the correlation between compositions,architecture,and performance,was discussed.

关键词： MXene fi lms Synthesis Assembly Mechanism Applications

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Monitoring the green evolution of vernacular buildings based on deep learning and multi-temporal remote sensing images

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Building Simulation 2023年第2期16卷 151-168页

作者： Baohua Wen fan Peng Qingxin yang Ting lu Beifang Bai Shihai Wu Feng Xu School of Architecture and Planning Hunan UniversityChangsha 410082China Hunan Key Laboratory of Sciences of Urban and Rural Human Settlements at Hilly Areas Changsha 410082China College of Electrical and Information Engineering Hunan UniversityChangsha 410082China School of Architecture Changsha University of Science and TechnologyChangsha 410004China

The increasingly mature computer vision(CV)technology represented by convolutional neural networks(CNN)and available high-resolution remote sensing images(HR-RSIs)provide opportunities to accurately measure the evolution of natural and artificial environments on Earth at a large *** on the advanced CNN method high-resolution net(HRNet)and multi-temporal HR-RSIs,a framework is proposed for monitoring a green evolution of courtyard buildings characterized by their courtyards being roofed(CBR).The proposed framework consists of an expert module focusing on scenes analysis,a CV module for automatic detection,an evaluation module containing thresholds,and an output module for data *** on this,the changes in the adoption of different CBR technologies(CBRTs),including light-translucent CBRTs(LT-CBRTs)and non-lighttranslucent CBRTs(NLT-CBRTs),in 24 villages in southern Hebei were identified from 2007 to *** evolution of CBRTs was featured as an inverse S-curve,and differences were found in their evolution stage,adoption ratio,and development speed for different ***-CBRTs are the dominant type but are being replaced and surpassed by NLT-CBRTs in some villages,characterizing different preferences for the technology type of *** proposed research framework provides a reference for the evolution monitoring of vernacular buildings,and the identified evolution laws enable to trace and predict the adoption of different CBRTs in a particular *** work lays a foundation for future exploration of the occurrence and development mechanism of the CBR phenomenon and provides an important reference for the optimization and promotion of CBRTs.

关键词： courtyard buildings evolution deep learning high-resolution network remote sensing images

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Multiple neurofibromas plus fibrosarcoma with familial NF1 pathogenicity:A case report

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World Journal of Clinical Cases 2020年第7期8卷 1306-1310页

作者： yang Wang Xiao-fan lu lu-lu Chen Ying-Wei Zhang Bing Zhang Department of Radiology The Affiliated Nanjing Drum Tower Hospital of Nanjing University Medical SchoolNanjing 210008Jiangsu ProvinceChina Research Center of Biostatistics and Computational Pharmacy China Pharmaceutical UniversityNanjing 210009Jiangsu ProvinceChina Department of Respiration The Affiliated Nanjing Drum Tower Hospital of Nanjing University Medical SchoolNanjing 210008Jiangsu ProvinceChina

BACKGROUND Neurofibromatosis(NF)is a genetic disease consisting of seven types,of which types 1 to 4 are caused by a dominant autosomal gene mutation;such disease sometimes arises in patients with NF type ***,it remains unclear whether the origin of neurofibrosarcoma is directly linked to the incidence of NF type 1,as no reports have been published on this ***,we report a case of NF1-positive multiple neurofibromas with malignant fibrosarcomatous transformation in the pleural *** SUMMARY A 51-year-old male was admitted to our hospital due to fever accompanied by coughing,chest tightness and asthma for more than one *** preliminary diagnosis was NF type 1,which was pathologically confirmed by a subsequent thoracoabdominal subcutaneous *** definitive diagnosis was neurofibrosarcoma with a pathogenic NF1 *** patient refused surgery and chemoradiotherapy,and died two months *** is a genetic disease consisting of seven types,of which types 1 to 4 are caused by a dominant autosomal gene *** case reported belongs to the class of NF1-positive dominant *** is a malignant tumor derived from cells surrounding the peripheral ***,due to the lack of previous reports,it remains unclear whether the origin of neurofibrosarcoma is directly linked to the incidence of NF type *** We report the first case of NF1-positive multiple neurofibromas with malignant fibrosarcomatous transformation in the pleural cavity.

关键词： Multiple neurofibromas Fibrosarcoma Neurofibromatosis type 1 pathogenicity Pseudochylothorax Pleural cavity Case report

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Unveiling the Growth Mechanism of Faceted Primary Al_(2)Cu with Complex Morphologies During Solidification

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Acta Metallurgica Sinica(English Letters) 2022年第1期35卷 124-132页

作者： Zongye Ding Qiaodan Hu fan yang Liao Yu Tianxing yang Naifang Zhang Wenquan lu Jingwei yang Jian Qiao Jianguo Li School of Mechatronic Engineering and Automation Foshan UniversityFoshan528225China Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai200240China

The growth characteristic of primary faceted Al_(2)Cu intermetallic compounds(IMCs)during solidification was observed directly by synchrotron *** formation and transition mechanisms of Al_(2)Cu IMCs with diverse morphologies were elucidated by first-principle calculations combined with electron backscatter diffraction *** Al_(2)Cu crystals preferred to grow along the[001]direction and were bounded by{110}planes with the lowest surface *** faceted Al_(2)Cu rod-like clusters consisted of multiple crystals with complete rod,hollowness and partial sides,which was attributed to the increase in strain energy and solute redistribution during *** faceted Al_(2)Cu with branches was characteristic with the perpendicular relationship between the main branches and side steps and partial coalescence at the junction,which was ascribed to the continuous propagation and growth of newly formed crystals along the diagonal direction.

关键词： Solidification Synchrotron radiography Internetallic compounds Crystal growth Morphology

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Enhanced tensile ductility of tungsten microwires via high-density dislocations and reduced grain boundaries

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Journal of Materials Science & Technology 2021年第36期95卷 193-202页

作者： Chaoqun Dang Weitong Lin fanling Meng Hongti Zhang Sufeng fan Xiaocui Li Ke Cao Haokun yang Wenzhao Zhou Zhengjie fan Ji-jung Kai yang lu Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhenChina School of Physical Science and Technology ShanghaiTech UniversityShanghaiChina Nano-Manufacturing Laboratory(NML) Shenzhen Research InstituteCity University of Hong KongShenzhenChina State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong UniversityXi'anChina Centre for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong KongChina

Despite being strong with many outstanding physical properties,tungsten is inherently brittle at room temperature,restricting its structural and functional applications at small ***,a facile strategy has been adopted,to introduce high-density dislocations while reducing grain boundaries,through electron backscatter diffraction(EBSD)-guided microfabrication of cold-drawn bulk tungsten *** designed tungsten microwire attains an ultralarge uniform tensile elongation of~10.6%,while retains a high yield strength of~2.4 *** situ TEM tensile testing reveals that the large uniform elongation of tungsten microwires originates from the motion of pre-existing high-density dislocations,while the subsequent ductile fracture is attributed to crack-tip plasticity and the inhibition of grain boundary *** work demonstrates the application potential of tungsten microcomponents with superior ductility and workability for micro/nanoscale mechanical,electronic,and energy systems.

关键词： Tungsten Dislocation Grain boundary Ductility In situ TEM Nanomechanics

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MTTSNet:Military time-sensitive targets stealth network via real-time mask generation

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Defence Technology（防务技术） 2024年第3期33卷 601-612页

作者： Siyu Wang Xiaogang yang Ruitao lu Zhengjie Zhu fangjia Lian Qing-ge Li Jiwei fan PLA Rocket Force University of Engineering Xi'an 710025China

The automatic stealth task of military time-sensitive targets plays a crucial role in maintaining national military security and mastering battlefield dynamics in military *** propose a novel Military Time-sensitive Targets Stealth Network via Real-time Mask Generation(MTTSNet).According to our knowledge,this is the first technology to automatically remove military targets in real-time from *** critical steps of MTTSNet are as follows:First,we designed a real-time mask generation network based on the encoder-decoder framework,combined with the domain expansion structure,to effectively extract mask ***,the ASPP structure in the encoder could achieve advanced semantic feature *** decoder stacked high-dimensional information with low-dimensional information to obtain an effective mask ***,the domain expansion module guided the adaptive expansion of mask ***,a context adversarial generation network based on gated convolution was constructed to achieve background restoration of mask positions in the original *** addition,our method worked in an end-to-end manner.A particular semantic segmentation dataset for military time-sensitive targets has been constructed,called the Military Time-sensitive Target Masking Dataset(MTMD).The MTMD dataset experiment successfully demonstrated that this method could create a mask that completely occludes the target and that the target could be hidden in real time using this *** demonstrated the concealment performance of our proposed method by comparing it to a number of well-known and highly optimized baselines.

关键词： Deep learning Military application Targets stealth network Mask generation Generative adversarial network

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High elasticity of CsPbBr_(3) perovskite nanowires for flexible electronics

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Nano Research 2021年第11期14卷 4033-4037页

作者： Xiaocui Li You Meng Rong fan Sufeng fan Chaoqun Dang Xiaobin Feng Johnny C.Ho yang lu Department of Mechanical Engineering City University of Hong KongHong Kong999077China Department of Materials Science and Engineering City University of Hong KongHong Kong999077China School of Automotive Engineering Dalian University of TechnologyDalian116024China Nano-Manufacturing Laboratory(NML) Shenzhen Research Institute of City University of Hong KongShenzhen518057China

Due to the enhanced ambient structural stability and excellent optoelectronic properties, all-inorganic metal halide perovskite nanowires have become one of the most attractive candidates for flexible electronics, photovoltaics and optoelectronics. Their elastic property and mechanical robustness become the key factors for device applications under realistic service conditions with various mechanical loadings. Here, we demonstrate that high tensile elastic strain (∼ 4% to ∼ 5.1%) can be achieved in vapor-liquid-solid-grown single-crystalline CsPbBr_(3) nanowires through in situ scanning electron microscope (SEM) buckling experiments. Such high flexural elasticity can be attributed to the structural defect-scarce, smooth surface, single-crystallinity and nanomechanical size effect of CsPbBr_(3) nanowires. The mechanical reliability of CsPbBr_(3) nanowire-based flexible photodetectors was examined by cyclic bending tests, with no noticeable performance deterioration observed after 5,000 cycles. The above results suggest great application potential for using all-inorganic perovskite nanowires in flexible electronics and energy harvesting systems.

关键词： perovskite nanowire CsPbBr_(3) nanomechanics in situ testing elasticity flexible electronics

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