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Journal of Iron and Steel Research International 2022年第1期29卷 103-114页

作者： zi-jian Wei Cheng Ji Tian-ci Chen Miao-yong Zhu Chen-hui Wu Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Shenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Pangang Group Research Institute Co. Ltd.Panzhihua 617000SichuanChina

The effects of the deformation parameters in the heavy reduction(HR)process on recrystallization kinetics and microstructure evolution were *** on the experimental results,metadynamic recrystallization(MDRX)kinetic and austenite grain size models were established for a continuously cast slab during ***,the evolution of the quenched microstructure after MDRX was observed using electron backscatter *** relative frequency of very low-angle grain boundaries decreased from 58.8% to 52.1%,and the relative frequency of high-angle grain boundaries increased from 28.5% to 38.9%.Analyses revealed that the recovery was the main softening *** decrease in the total grain boundary length indicated that subgrain growth occurred with increasing inter-pass *** main texture evolved from a {001}texture to a{112}texture,and the texture strength remained unchanged.

关键词： Microalloyed steel heavy reduction Metadynamic recrystallization Microstructure evolution Kinetic model

Intelligent geochemical interpretation of mass chromatograms:Based on convolution neural network

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Petroleum Science 2024年第2期21卷 752-764页

作者： Kai-Ming Su Jun-Gang Lu jian Yu zi-Xing Lu Shi-Jia Chen Hubei Key Laboratory of Petroleum Geochemistry and Environment Wuhan430100HubeiChina College of Resources and Environment Yangtze UniversityWuhan430100HubeiChina School of Geoscience and Technology Southwest Petroleum UniversityChengdu610500SichuanChina Changqing Oilfield Company PetroChinaXi'an710021ShaanxiChina

Gas chromatography-mass spectrometry(GC-MS)is an extremely important analytical technique that is widely used in organic *** is the only approach to capture biomarker features of organic matter and provides the key evidence for oil-source correlation and thermal maturity ***,the conventional way of processing and interpreting the mass chromatogram is both timeconsuming and labor-intensive,which increases the research cost and restrains extensive applications of this *** overcome this limitation,a correlation model is developed based on the convolution neural network(CNN)to link the mass chromatogram and biomarker features of samples from the Triassic Yanchang Formation,Ordos Basin,*** this way,the mass chromatogram can be automatically *** research first performs dimensionality reduction for 15 biomarker parameters via the factor analysis and then quantifies the biomarker features using two indexes(*** and PMI)that represent the organic matter thermal maturity and parent material type,***,training,interpretation,and validation are performed multiple times using different CNN models to optimize the model structure and hyper-parameter setting,with the mass chromatogram used as the input and the obtained MI and PMI values for supervision(label).The optimized model presents high accuracy in automatically interpreting the mass chromatogram,with R2values typically above 0.85 and0.80 for the thermal maturity and parent material interpretation results,*** significance of this research is twofold:(i)developing an efficient technique for geochemical research;(ii)more importantly,demonstrating the potential of artificial intelligence in organic geochemistry and providing vital references for future related studies.

关键词： Organic geochemistry Biomarker Mass chromatographic analysis Automated interpretation Convolution neural network Machine learning

A Modified Model for Soil–Structure Interface Considering Random Damage of Mesoscopic Contact Elements

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China Ocean Engineering 2023年第5期37卷 807-818页

作者： KE Li-jun GAO Yu-feng ZHAO zi-hao LI Da-yong JI jian Institute of Geotechnical Engineering Yangzhou UniversityYangzhou 225127China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China School of Civil Engineering Shenyang Jianzhu(Architecture and Engineering)UniversityShenyang 110819China College of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao 266580China

The interaction between soil and marine structures like submarine pipeline/pipe pile/suction caisson is a complicated geotechnical mechanism *** this study,the interface is discretized into multiple mesoscopic contact elements that are damaged randomly throughout the shearing process due to the natural *** evolution equation of damage variable is developed based on the Weibull function,which is able to cover a rather wide range of distribution shapes by only two parameters,making it applicable for varying ***,a statistical damage model is established by incorporating Mohr–Coulomb strength criterion,in which the interfacial residual strength is considered whereby the strain softening behavior can be described.A concept of“semi-softening”characteristic point on shear stress–displacement curve is proposed for effectively modeling the evolution of strain ***,a series of ring shear tests of the interfaces between fine sea sand and smooth/rough steel surfaces are *** predicted results using the proposed model are compared with experimental data of this study as well as some results from existing literature,indicating that the model has a good performance in modeling the progressive failure and strain softening behavior for various types of soil–structure interfaces.

关键词： soil–structure interface statistical damage model mesoscopic element Weibull function “semi-softening”characteristic point

Molecular identification, expression and function analysis of peroxidasin in Chilo suppressalis

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Insect Science 2020年第6期27卷 1173-1185页

作者： Chun-Ping Ma zi-Mu Guo Feng-Li Zhang jian-Ya Su Key Laboratory of Integrated Management of Crop Diseases and Pests(Ministry of Education) College of Plant ProtectionNanjing Agricultural UniversityNanjingChina

Peroxidasin plays a unique role in the formation and stability of extracellular matrix(ECM)in the animal kingdom;however,it was only characterized in Diptera,not in other insect *** this study peroxidasin(CsPxc/)was first identified and characterized from Chilo suppressalis,a lepidopteran *** complementary DNA with a 4080 bp open reading frame encodes a peptide of 1359 amino acids;the derived amino acid sequence of CsPxd harbors the typical structural characteristics of peroxidasin family in heme-peroxidase superfamily,including the signal peptide at N-terminal,leucine-rich repeat domain,Ig-loop motifs and peroxidase domain,signifying the extracellular location of protein and the involvement in ECM *** expression reveals CsPxd protein displays peroxidase activity on H2O2,justifying the membership of *** analysis shows the monophyletic evolution pattern of peroxidasin in insect phyle,and moreover only one peroxidasin is present in each species of insects,suggesting its evolutionary conservation on *** messenger RNA is mainly expressed in egg and the final instar larvae *** of peroxidasin double-stranded RNA into the final instar larvae impacts the cuticle sclerotization during the metamorphosis from larvae to pupa,and eventually lead to lethality of larvae and *** results suggest the presence of collagen crosslink in chorion and cuticle of insects,and indicate peroxidasin plays a role in the development of chorion and cuticle;furthermore peroxidasin might be the one of potential target genes for pest control using RNA interference.

关键词： Chilo suppressalis cuticle sclerotization peroxidase peroxidasin RNA interference

Momentum-space polarization fields in two-dimensional photonic-crystal slabs:Physics and applications

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Chinese Physics B 2022年第10期31卷 23-33页

作者： Wen-Zhe Liu Lei Shi Che-Ting Chan jian zi Department of Physics The Hong Kong University of Science and TechnologyHong Kong 999077China State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and Department of PhysicsFudan UniversityShanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

In addition to non-radiative guided modes, two-dimensional photonic-crystal slabs support guided resonant ones which can radiate into free space. From the polarization states of these guided resonances, a polarization field on a photonic band can be constructed in momentum space. Momentum-space polarization fields display complicated configurations and patterns with different types of polarization singularities inside, shedding new light on the manipulations of light *** this review, we summarize the recent research progress on momentum-space polarization fields and singularities in two-dimensional photonic-crystal slabs, focusing on their unique optical properties and potential applications as well.

关键词： photonic crystal polarization field polarization singularity

Portable fluorogenic probe for monitoring of volatile amine vapour and food spoilage

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Chinese Chemical Letters 2024年第3期35卷 257-261页

作者： jian-Hao Zhao Wen-Xing Xu Bin Li Wei Xu Wu-Kun Zhang Ming-Shuai Yuan Hui-zi Li Qing-Guo he Xiang Ma jian-Gong Cheng Yan-Yan Fu State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of the Chinese Academy of SciencesBeijing 100039China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

There are urgent needs of volatile amine gas sensors with high-performance in food quality control,disease monitoring and environmental ***-film fluorescent probe is suitable for amine vapour sensing due to its high sensitivity,high selectivity,and no polluting ***,a novel fluorescent probe based on indacenodithiophene structure withπconjugated system was designed and *** experimental results show that the films prepared by this material exhibit rapid and distinct fluorescence quenching after being exposed to saturated vapours of primary amine,secondary amine and tertiary amine represented by n-propylamine,diethylamine and trimethylamine,*** quenching of fluorescence is 84%,87%and 96%,respectively,within 10 *** detection mechanism of probe for primary amine is based on specific chemical reaction,while the detection mechanism for secondary amine and tertiary amine is intramolecular charge *** experiments show that the detection limit of the fluorescent probe for trimethylamine,an important marker of food spoilage,could reach 4.610 ***-site detection based on spoilage of small yellow croaker suggests the material possesses the potential for food freshness *** simple fluorogenic probe is an original approach to simplify real-time visual monitoring of volatile amine vapour.

关键词： Fluorescent probe Volatile amine Gas sensing Trimethylamine Food spoilage

Soft X-ray ptychography method at SSRF

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Nuclear Science and Techniques 2017年第6期28卷 86-94页

作者： Chun-Peng Wang zi-jian Xu Hai-Gang Liu Xulei Tao Ren-Zhong Tai Shanghai Institute of Applied Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

Ptychography is a diffraction-based X-ray microscopy technique in which an extended sample is scanned by a coherent beam with overlapped illuminated areas and complex transmission function of the sample is obtained by applying iterative phase retrieval algorithms to the diffraction patterns recorded at each scanned *** permits quantitatively imaging of non-crystalline specimens at a resolution limited only by the X-ray wavelength and the maximal scattering angle *** this paper,the development of soft X-ray ptychography method at the BL08U1 A beamline of Shanghai Synchrotron Radiation Facility is *** experimental setup,experimental parameters selection criteria,and post-experimental data analyzing procedures are presented in detail with a prospect of high-resolution image reconstruction in real *** performance of this newly implemented method is demonstrated through the measurements of a resolution test pattern and two real samples:Pt-Co alloy nanoparticles and a breast cancer *** results indicate that strong scattering specimens can be reconstructed to sub-20 nm resolution,while a sub-25 nm resolution for biological specimens can be achieved.

关键词： Ptychography Coherent diffraction imaging X-ray microscopy Phase retrieval

On-demand inverse design of acoustic metamaterials using probabilistic generation network

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Science China(Physics,Mechanics & Astronomy) 2023年第2期66卷 87-94页

作者： Ze-Wei Wang An Chen zi-Xiang Xu Jing Yang Bin Liang jian-Chun Cheng Key Laboratory of Modern Acoustics MOEInstitute of Acoustics Department of PhysicsNanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing University.Nanjing 210093China

On-demand inverse design of acoustic metamaterials(AMs),which aims to retrieve the optimal structure according to given requirements,is still a challenging task owing to the non-unique relationship between physical structures and spectral ***,we propose a probabilistic generation network(PGN) model to unveil this implicit relationship and implement this concept with an acoustic magic-cube *** employing the auto-encoder-like configuration composed of a gate recurrent unit(GRU) and a deep neural network,our PGN model encodes the required spectral response into a latent *** memory or feedback loop contained in the proposed GRU allows it to effectively recognize sequence characteristics of a *** method of modeling the inverse problem and retrieving multiple meta structures in a probabilistic generative manner skillfully solves the one-to-many mapping issue that is intractable in deterministic ***,to meet different sound absorption requirements,we tailored several representative spectra with low-frequency sound absorption characteristics,generating highprecision(MAEher verify the effective prediction of the proposed PGN strategy,the experiment was carried out in a tailored broadband example,whose results coincide with both theoretical and numerical *** with other 5 networks,the PGN model exhibits higher accuracy and *** work offers flexible and diversified solutions for multivalued inverse problems,opening up avenues to realize the on-demand de sign of AMs.

关键词： inverse probabilistic network

Mesh sharpening via normal filtering

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第4期10卷 546-553页

作者： jian-guo SheN San-yuan ZHANG Zhi-yang CheN Yin ZHANG Xiu-zi YE State Key Laboratory of CAD & CG Zhejiang University Hangzhou 310027 China Software College Zhejiang University of Technology Hangzhou 310014 China

We present a robust mesh sharpening approach to reconstructing sharp features from blended or chamfered features, even with noise and aliasing errors. Feature regions were first recognized via normal variation according to the user's input, and then normal filtering was applied to faces of feature regions. Finally, the vertices of the feature region were gradually updated based on new face normals using a least-squares error criterion. Experimental results demonstrate that the method is effective and robust in sharpening meshes.

关键词： Normal filtering Sharp feature Mesh sharpening Blend Chamfer

Hydrogen storage properties of MgH2 co-catalyzed by LaH3 and NbH

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International Journal of Minerals,Metallurgy and Materials 2017年第10期24卷 1183-1191页

作者： jian-zheng Song zi-yang Zhao Xin Zhao Rui-dong Fu Shu-min Han State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China College of Environmental and Chemical Engineering Yanshan University Qinhuangdao 066004 China

To improve the hydrogen storage properties of Mg-based alloys, a composite material of MgH_2 + 10wt%LaH_3 + 10wt%NbH was prepared by a mechanical milling method. The composite exhibited favorable hydrogen desorption properties, releasing 0.67wt% H2 within 20 min at 548 K, which was ascribed to the co-catalytic effect of LaH_3 and NbH upon dehydriding of MgH_2. By contrast, pure MgH_2, an MgH_2 + 20wt%LaH_3 composite, and an MgH_2 + 20wt%NbH composite only released 0.1wt%, 0.28wt%, and 0.57wt% H2, respectively, under the same conditions. Analyses by X-ray diffraction and scanning electron microscopy showed that the composite particle size was small. Energy-dispersive X-ray spectroscopic mapping demonstrated that La and Nb were distributed homogeneously in the matrix. Differential thermal analysis revealed that the dehydriding peak temperature of the MgH_2 + 10wt%LaH_3 + 10wt%NbH composite was 595.03 K, which was 94.26 K lower than that of pure MgH_2. The introduction of LaH_3 and NbH was beneficial to the hydrogen storage performance of MgH_2.

关键词： energy storage materials hydrogen absorbing materials mechanical milling phase transformation activation analysis