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Optimization of porous structures via machine learning for solar thermochemical fuel production

Progress in Natural Science:Materials International 2024年第5期34卷 895-906页

作者： Da Xu Lei Zhao meng lin Harbin Institute of Technology Department of Mechanical and Energy Engineering Southern University of Science and Technology SUSTech Energy Institute for Carbon Neutrality Southern University of Science and Technology

Porous reactant is the key component in solar thermochemical reactions, significantly affecting the solar energy conversion and fuel production performance. Triply periodic minimal surface（TPMS） structures, with analytical expressions and predictable structure-property relationships, can facilitate the design and optimization of such structures. This work proposes a machine learning-assisted framework to optimize TPMS structures for enhanced reaction efficiency, increased fuel production,and reduced temperature gradients. To mitigate the computational cost of conventional high-throughput optimization, neural network regression models were used to for performance prediction based on input features. The training dataset was generated using a three-dimensional multiphysics model for the thermochemical reduction driven by concentrated solar energy considering fluid flow, heat and mass transfer, and chemical reacions. Both uniform and gradient structures were initially assessed by the three-dimensional model showing gradient design in c and ω were necessary for performance enhancement. Further, with our proposed optimization framework, we found that structures with parameters c1= c2= 0.5（uniform in c） and ω1= 0.2, ω2= 0.8（gradient in ω） achieved the highest relative efficiency(fchem/fchem,ref) of 1.58, a relative fuel production(Δδ/Δδref) of 7.94, and a max relative temperature gradient（dT/dy）/（dT/dy）refof 0.26. Kinetic properties,i.e., bulk diffusion and surface exchange coefficient, were also studied showing that for materilas with slow kinetics, the design space in terms of c and ω were highly limited compared to fast kinetics materials. Our framework is adaptable to diverse porous structures and operational conditions, making it a versatile tool for screening porous structures for solar thermochemical applications. This work has the potential to advance the development of efficient solar fuel production systems and scalable industrial applications in renewable energy

关键词： Regression analysis

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Special Problems in Pilot Protections of Transmission lines Connecting Wind Farms

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电力系统自动化 2012年第8期36卷 143-147页

作者： Li, Bin lin, meng Fan, Xulu Li, Xuebin Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China

As the penetration of wind power into power grids increases,higher demands are made on the stability and protection of power *** traditional synchronous generators,wind turbines are different on the short-circuit and impedance characteristics,thus some problems exist in pilot protections of transmission lines connecting wind *** a single-phase fault occurs on a transmission line,the phase selector based on current-difference sudden-change may mistake the single-phase fault for a phase-to-phase *** paper studies the impedance characteristics of an asynchronous wind generator,and analyzes the behavior of a fault phase selector under different ***,the paper explains that inequality between positive and negative branch coefficients is the cause for the mal-operation of the fault phase ***,some simulations are done in MATLAB to validate analysis results.

关键词：风电场保护输电线路连接单相接地故障风力发电机故障选相 MATLAB

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Precise determination of the pole position of the exotic Z_(c)(3900)

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Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 84-90页

作者： Yun-Hua Chen meng-lin Du Feng-Kun Guo School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China School of Physics University of Electronic Science and Technology of ChinaChengdu 611731China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China

We perform a unified description of the experimental data of the π^(+)π^(-)and J/ψπ^(±)invariant mass spectra for e^(+)e^(-)→J/ψπ^(+)π^(-)and the D^(0)D^(*-)mass spectrum for e^(+)e^(-)→D^(0)D^(*-)π^(+)at e^(+)e^(-)center-of-mass energies 4.23 and 4.26 *** analysis takes into account open-charm meson loops that contain triangle singularities,the J/ψπ-DD^(*)coupled-channel interaction respecting unitarity,and the strong ππ-KK final state interaction using dispersion *** analysis leads to a precise determination of the Z_(c)(3900)pole with the pole mass and width(3880.7±1.7_(stat)±22.4_(syst))MeV and(35.9±1.4_(stat)±15.3_(syst))MeV,respectively,and hints at that the DD^(*)molecular and non-molecular components are of similar importance in the Z_(c)(3900)formation.

关键词： exotic hadrons dispersion relations final state interaction triangle singularity

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Thermal structure about southwest sub-basin of South China Sea

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Earthquake Science 2011年第5期24卷 427-436页

作者： lin meng Jian Zhang Laboratory of Computational Geodynamics The Graduate University of the Chinese Academy of Sciences Beijing 100049 China

There are some factors, such as the topographic relief, sedimentary thickness and thermal conductivity, magmatic activity and thermal cooling, influencing the seafloor heat flow and the evolution of lithosphere structure in southwest sub-basin （SWSB）, South China Sea. On the base of the geological structure characteristic of SWSB this paper will discuss some other factors including thermal anomaly area, dike produced by magma intrusion and lithosphere relief, by modeling and calculating. Calculating results indicate partial areas where temperature is higher than vicinity in the lithosphere, which we call thermal anomaly here containing thermal anomaly area and dike in this paper, could decrease heat flow below, increase above, and gradually increase to two sides; heat flow in upwelling parts of lithosphere is usually higher than sinking parts, and in the middle is of a gradual transition.

关键词： southwest sub-basin (SWSB) thermal anomaly field heat flow dike lithosphere relief

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Flexible MXene/sodium alginate composite fabric with high structural stability and oxidation resistance for electromagnetic interference shielding

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Nano Research 2024年第6期17卷 5326-5335页

作者： Hao-Wen Zhang Lu-Yao Yang meng-lin Huang Ming-Hua Cheng Zhe-Sheng Feng Fanbin meng Zifeng lin Yan Wang School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054China Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China College of Materials Science and Engineering Sichuan UniversityChengdu 610065China

Wearable electromagnetic interference(EMI)shielding fabrics with excellent electromagnetic shielding performance,oxidation resistance,and structural stability are highly demanded for the rapid development of electronic devices and wireless *** are metallic conductive materials with exceptional EMI shielding properties,but they are prone to oxidation in air and have poor structural stability and durability on fabric ***,we present a one-step assembly method to fabricate fabrics coated with MXenes and polymeric sodium alginate(SA)composite(MXene-SA).SA protects MXenes from oxidation and forms a stable interlayer structure by bonding to *** MXene-SA coated fabrics are breathable and flexible,and have a low sheet resistance of 2.12±0.08Ω/sq and a high EMI shielding performance of 37.05 dB at X-band,which is comparable to the best 42.31 ***,the MXene-SA coated fabrics exhibit high structural stability and oxidation resistance under various conditions of sonication disintegration,mechanical abuse,chemical corrosion,and humidity,compared to pure MXenes coated *** believe that the wearable and high-performance MXene-SA fabrics have great potential for the next generation of ultra-portable and wearable EMI shielding products.

关键词： MXenes electromagnetic interference shielding fabric one-step assembly

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The early Japanese books reorganization by combining image processing and deep learning

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CAAI Transactions on Intelligence Technology 2022年第4期7卷 627-643页

作者： Bing Lyu Hengyi Li Ami Tanaka lin meng Graduate School of Science and Engineering Ritsumeikan UniversityKusatsuShigaJapan College of Science and Engineering Ritsumeikan UniversityKusatsuShigaJapan

Many early Japanese books record a large amount of information,including historical politics,economics,culture,and so on,which are all valuable *** books are waiting to be reorganized at the ***,a large amount of the books are described by Kuzushiji,a type of handwriting cursive script that is no longer in use today and only readable by a few ***,researchers are trying to detect and recognise the characters from these books through modern ***,the characteristics of the Kuzushiji,such as Connect-Separate-characters and Manyvariation,hinder the modern technique assisted ***-Separatecharacters refer to the case of some characters connecting each other or one character being separated into unconnected parts,which makes character detection *** is one of the typical characteristics of Kuzushiji,defined as the case that the same character has several variations even if they are written by the same person in the same book at the same time,which increases the difficulty of character *** this sense,this paper aims to construct an early Japanese book reorganisation system by combining image processing and deep learning *** experimentation has been done by testing two early Japanese *** terms of character detection,the final Recall,Precision and F-value reaches 79.8%,80.3%,and 80.0%,*** deep learning based character recognition accuracy of Top3 reaches 69.52%,and the highest recognition rate reaches 82.57%,which verifies the effectiveness of our proposal.

关键词： character recognition deep learning image processing Japanese books reorganization Kuzushiji

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Comparison of membrane fouling during short-term filtration of aerobic granular sludge and activated sludge

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Journal of Environmental Sciences 2007年第11期19卷 1281-1286页

作者： ZHOU Jun YANG Feng-lin meng Fan-gang AN Peng WANG Di School of Environmental and Biological Science and Technology Dalian University of Technology Dalian 116024 China

Aerobic granular sludge was cultivated adopting internal-circulate sequencing batch airlift reactor. The contradistinctive experiment about short-term membrane fouling between aerobic granular sludge system and activated sludge system were investigated. The membrane foulants was also characterized by Fourier transform infrared （FTIR） spectroscopy technique. The results showed that the aerobic granular sludge had excellent denitrification ability; the removal efficiency of TN could reach 90%. The aerobic granular sludge could alleviate membrane fouling effectively. The steady membrane flux of aerobic granular sludge was twice as much as that of activated sludge system. In addition, it was found that the aerobic granular sludge could result in severe membrane pore-blocking, however, the activated sludge could cause severe cake fouling. The major components of the foulants were identified as comprising of proteins and polysaccharide materials.

关键词： membrane bioreactor membrane fouling pore-blocking cake layer resistance aerobic granular sludge

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Enriched environment for offspring improves learning and memory impairments induced by sevoflurane exposure during the second trimester of pregnancy

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Neural Regeneration Research 2022年第6期17卷 1293-1298页

作者： Shao-Wei Yin Yi-lin meng Chuang Li Yuan Wang Department of Obstetrics Shengjing Hospital of China Medical UniversityShenyangLiaoning ProvinceChina Department of Anesthesiology Shengjing Hospital of China Medical UniversityShenyangLiaoning ProvinceChina

Studies in animals indicate that sevoflurane exposure in the second trimester of pregnancy has harmful effects on the learning and memory of *** an enriched environment can reverse the damage of sevoflurane exposure in the second trimester of pregnancy on the learning and memory of rat offspring remains *** this study,rats at 14 days of pregnancy were exposed to 3.5%sevoflurane for 2 hours and their offspring were treated with an enriched environment for 20 successive *** found that the enriched environment for offspring increased nestin and Ki67 levels in hippocampal tissue,increased hippocampal neurogenesis,inhibited glycogen synthase kinase 3βactivity,and increased the expression of cell proliferation-relatedβ-catenin and apoptosis-related Bcl-2,indicating that an enriched environment reduces sevoflurane-induced damage by increasing the proliferation of stem cells in the *** findings suggest that an enriched environment can reverse the effects of sevoflurane inhaled by rats during the second trimester of pregnancy on learning and memory of *** study was approved by the Animal Ethics Committee of Shengjing Hospital of China Medical University(approval No.2018PS07K)on January 2,2018.

关键词： apoptosis fetal learning memory neurogenesis offspring proliferation sevoflurane signal pathway

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Stable Estimation of Horizontal Velocity for Planetary Lander with Motion Constraints

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IEEE/CAA Journal of Automatica Sinica 2015年第2期2卷 198-206页

作者： Wei Shao Shulin Sui lin meng Yaobin Yue College of Automation&Electronic Engineering Qingdao University of Science&Technology School of Mathematics&Physics Qingdao University of Science&Technology

The planetary lander usually selects image feature points and tracks them from frame to frame in order to determine its own position and velocity during landing. Aiming to keep features tracking in consecutive frames, this paper proposes an approach of calculating the field of view (FOV) overlapping area in a 2D plane. Then the rotational and translational motion constraints of the lander can be found. If the FOVs intersects each other, the horizontal velocity of the lander is quickly estimated based on the least square method after the ill-conditioned matrices are eliminated previously. The Monte Carlo simulation results show that the proposed approach is not only able to recover the ego-motion of planetary lander, but also improves the stabilization performance. The relationship of the estimation error, running time and number of points is shown in the simulation results as well. © 2014 Chinese Association of Automation.

关键词： Intelligent systems Landing Least squares approximations Monte Carlo methods Velocity

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Thickness modulation effect of CeO_2 layer for YBCO films grown by pulsed laser deposition

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Rare Metals 2018年第3期37卷 225-231页

作者： Xiang Wu lin-Fei Liu Yan-Jie Yao meng-lin Wang Bin-Bin Wang Yi-Jie Li Department of Physics and Astronomy Shanghai Jiao Tong University

CeO2 film plays an essential role in nucleation and growth of YBa2 Cu3 O（7-x）（YBCO） films. In this work,the dependence of superconducting properties of YBCO on CeO2 films with different thicknesses was investigated,in order to achieve fabrication of high-performance YBCO coated conductors in industrial scale. The crystalline structure and morphology of CeO2 films with thickness ranging from 21 to 563 nm were systematically characterized by means of X-ray diffraction（XRD）, atomic force microscope（AFM） and reflection high-energy electron diffraction（RHEED）. Additional focus was addressed on evolution of the surface quality of CeO2 films with thickness increasing. The results show that at the optimal thickness of 221 nm, CeO2 film exhibits sharp in-plane and out-of-plane texture with full width of half maximum（FWHM） values of 5.9° and 1.8°, respectively, and smooth surface with a mean root-mean-square（RMS） roughness value as low as 0.6 nm. Combing RHEED and transmission electron microscope（TEM） cross-sectional analysis, it is found that nucleation and growth of CeO2 films at early stage remain in island growth mode with rougher surface,while further increasing the thickness beyond the optimal thickness leads to weak surface quality, consequently resulting in degradation of superconductor layers deposited subsequently. Eventually, a critical current density（Jc） as high as 4.6×10-6 A·cm-（-2）（77 K, self-field） is achieved on a YBCO film on a thickness-modulated CeO2/MgO/Y2 O3/Al2 O3/C276 architecture, demonstrating the advantages of CeO2 films as buffer layer in high-throughput manufacture of coated conductors.

关键词： CeO2 films Thickness modulation Pulsed laser deposition Surface quality

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