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Feature selection of BOF steelmaking process data by using an improved grey wolf optimizer

Journal of Iron and Steel Research International 2022年第8期29卷 1205-1223页

作者： zong-xin chen Hui Liu Long Qi Faculty of Information Engineering and Automation Kunming University of Science and TechnologyKunming 650500YunnanChina yunnan Key Laboratory of Artificial Intelligence Kunming University of Science and TechnologyKunming 650500YunnanChina

Basic oxygen furnace(BOF)steelmaking end-point control using soft measurement models has essential value for economy and ***,the high-dimensional and redundant data of the BOF collected by the sensors will hinder the performance of *** traditional feature selection results based on meta-heuristic algorithms cannot meet the stability of actual industrial *** order to eliminate the negative impact of feature selection application in the BOF steelmaking,an improved grey wolf optimizer(IGWO)for feature selection was proposed,and it was applied to the BOF data ***,the proposed algorithm preset the size of the feature subset based on the new encoding scheme,rather than the traditional uncertain number ***,opposition-based learning was used to initialize the grey wolf population so that the initial population was closer to the potential optimal *** addition,a novel population update method retained the features closely related to the best three grey wolves and probabilistically updated irrelevant features through measurement or random *** methods were used to search feature subsets to maximize search capability and stability of algorithm on BOF steelmaking ***,the proposed algorithm was compared with other feature selection algorithms on the BOF data *** results show that the proposed IGWO can stably select the feature subsets that are conductive to the end-point regression accuracy control of BOF temperature and carbon content,which can improve the performance of the BOF steelmaking.

关键词： Basic oxygen furnace Feature selection Grey wolf optimization Regression Opposition-based learning

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Surface micro-arrays enhancing electromagnetic interference shielding of polydimethylsiloxane/multiwalled carbon nanotubes nanocomposites

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Nano Research 2025年第1期18卷 508-519页

作者： Ke Jiang Zhi chen Ji yu chen Zheng Shan Huang Ming Wang Chongqing Key Laboratory of Soft-Matter Material Manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China School of Mechanics Civil Engineering and ArchitecturesNorthwestern Polytechnical UniversityXi’an 710072China Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory(Rongjiang Laboratory) Jieyang 515200China

Herein,the electromagnetic shielding performance of surface concave-convex(SC)and zig-zag micro-arrays was studied by using a simulation prediction and a three-dimensional(3D)printing custom ***,surface stripe concaveconvex(SSC)and surface cylindrical concave-convex(SCC)micro-arrays with or without zig-zag micro-arrays are designed,and their shielding performance is simulated in multi-bands(C-,X-band).The multiwalled carbon nanotubes/polydimethylsiloxane composites(MWCNT/PDMS)with different SC structures and different electrical conductivity are molded in acrylonitrile-butadiene-styrene copolymer(ABS)molds which are printed by a 3D *** results show that the electromagnetic interference shielding effectiveness(EMI SE)of the samples can be enhanced by constructing the SC micro-arrays with zig-zag micro-arrays,and improving with the increase of conductivity and *** addition,the shielding mechanism of the SC-MWCNT/PDMS composites is investigated and discussed by an electromagnetic simulation.

关键词： surface micro-arrays electrical properties electromagnetic interference(EMI)shielding three-dimensional(3D)printing

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Metastable seed-crystals: epitaxial growth of branched-array organic heterostructure nanowires

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Science China Chemistry 2025年

作者： Jin Feng Zhen-yu Geng Ting-Yao Song Ying-Xin Ma Chuan-Zeng Wang Wei Zhang Hong-Tao Lin Jin Zhou Shu-Ping Zhuo Shu-Hai chen Xue-Dong Wang School of Chemistry and Chemical Engineering Shandong University of Technology Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & DevicesSoochow University College of Chemistry and Chemical Engineering Hunan Normal University

Tunable light–matter interactions are exhibited by organic low-dimensional crystals, making these crystals a promising platform for organic photonics. However, the precise synthesis of organic low-dimensional crystals remains challenging due to the stochastic nature of molecular nucleation processes. Herein, the directed nucleation process is driven by the introduction of metastable seed-crystals as the trunk, which ultimately leads to branched-array organic heterostructures. The successful formation of organic heterostructures with high-density branched arrays is attributed to the highest attachment energy (Eatt（023）=-104.25 kcal mol-1) of the exposed （023） crystal plane during the seed-crystal growth route. Significantly, these as-prepared heterostructures inherently have an ultralow lattice mismatch ratio η of 0.7%between trunk and branch, which contributes to the multi-channel photon transportation. Therefore, this work provides valuable insights into a versatile synthetic strategy for accessing low-dimensional heterostructures for integrated optoelectronics.

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Alkoxy substituted MeO-BIPHEP-type diphosphines ligands for asymmetric hydrogenation of aryl ketones

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Chinese Chemical Letters 2010年第5期21卷 576-579页

作者： Meng Lin Ma zong Hai Peng yu Guo Li chen Hua chen Xian Jun Li Department of Chemistry Xihua UniversityChengdu 610039China Key Lab of Green Chemistry and Technology Ministry of EducationThe Institute of Homogeneous CatalysisFaculty of ChemistrySichuan UniversityChengdu 610064China

In this paper,a series of optically active MeO-BIPHEP-type ligands,（S）-6,6′-dimethoxy-2,2’-bis（di-p-alkoxyphenylphosphine）- 1,1′-biphenyl were synthesized and used to prepare the ruthenium *** effects of para-substituted were observed,the results showed that the ruthenium catalysts[diphosphine RuCl;diamine]containing both t-Bu and i-Pr substitutions have better activities and enantioselectivities than the non-substituted ruthenium catalysts in the asymmetric hydrogenation of acetophenone.

关键词： Aryl ketone Asymmetric hydrogenation Biaryl phosphines ligands Ruthenium complex

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The Role of the AMPK Pathway in ZEA-induced Cellcycle Arrest in Rat Sertoli Cells

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Biomedical and Environmental Sciences 2019年第12期32卷 944-948页

作者： chen yu Lian chen Yong Fang FENG Nan Nan LIU zong Ping BIAN Jian Chun College of Veterinary Medicine Yangzhou UniversityYangzhou 225009JiangsuChina Jiangsu Co-innovation Center for Preve ntion and Control of Imports nt An imal In fectious Diseases and Zoonoses Yan gzhou 225009Jia ngsuChina

Zearalenone(ZEA),a non-steroidal estrogen-like mycotoxin biosynthesized by several Fusarium species through the polyketide pathway,is also known as the F-2 toxin[1].ZEA is one kind of common mycotoxins frequently found in feed ingredients and compound feed that can specifically and competitively bind to estrogen receptors resulting in sexual hormone disorder which can negatively affectthe expressi on of sec on dary sexual characteristics[2].

关键词： competitive cycle steroidal

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Towards a Unified Recurrent Neural Network Theory： The Uniformly Pseudo-Projection-Anti-Monotone Net

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Acta Mathematica Sinica,English Series 2011年第2期27卷 377-396页

作者： zong Ben XU chen QIAO Institute for Information and System Science Faculty of Science MOE Key Lab for Intelligent Networks and Network Security Xi'an Jiaotong University Xi'an 710049 P. R. China qiaochen @mail.xjtu. edu. cn

In the past decades, various neural network models have been developed for modeling the behavior of human brain or performing problem-solving through simulating the behavior of human brain. The recurrent neural networks are the type of neural networks to model or simulate associative memory behavior of human being. A recurrent neural network （RNN） can be generally formalized as a dynamic system associated with two fundamental operators： one is the nonlinear activation operator deduced from the input-output properties of the involved neurons, and the other is the synaptic connections （a matrix） among the neurons. Through carefully examining properties of various activation functions used, we introduce a novel type of monotone operators, the uniformly pseudo-projectionanti-monotone （UPPAM） operators, to unify the various RNN models appeared in the literature. We develop a unified encoding and stability theory for the UPPAM network model when the time is discrete. The established model and theory not only unify but also jointly generalize the most known results of RNNs. The approach has lunched a visible step towards establishment of a unified mathematical theory of recurrent neural networks.

关键词： Feedback neural networks essential characteristics uniformly pseudo-projection-anti- monotone net unified theory dynamics

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Crystallization behavior of blast furnace slag modified by adding iron ore tailing

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Journal of Iron and Steel Research International 2017年第6期24卷 601-607页

作者： Qian-qian Ren yu-zhu Zhang yue Long Shao-sheng chen zong-shu zou Jie Li chen-guang Xu School of Metallurgy Northeastern University Shenyang 110819 Liaoning China State Key Laboratory of Advanced Steel Processes and Products Central Iron and Steel Research Institute Beijing 100081 China College of Metallurgy and Energy North China University of Science and Technology Tangshan 063009 Hebei China

Blast furnace （BF） slag is a by-product of the ironmaking process and could be utilized to manufacture slag fiber by adding iron ore tailing. The crystallization behavior of the modified BF slag is significant to the fi- brosis process. To investigate the influence of basieity on the crystallization behavior, BF slag was modi- fied by adding iron ore tailing at room temperature and melted at 1 500 ℃. FactSage simulation, X-ray dif- fraction, scanning electron microscopy backscattered electron imaging coupled to an energy dispersive spectrometer, and hot thermocouple technique analysis were performed to explore the crystallization be- havior of the modified BF slag during the cooling process. It was found that the initial crystallization tem- perature increased with the increase in basicity. Melilite, anorthite, clinopyroxene, and wollastonite could be generated during the cooling process as basicity ranged from 0.7 to 0.9. Spinel could be found as one of the phases; however, wollastonite disappeared under a basicity of 1.0. The initial crystallization tempera- ture was controlled by the crystallization of melilite during the cooling process when the basicity of the modified BF slag ranged from 0. 7 to 1.0. Moreover, the cooling rate could also influence the crystalliza- tion of the modified BF slag.

关键词： Crystallization behaviorModified blast furnaceslagBasicityInitial crystallizationtemperatureIron ore tailing

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Growth, Zeros and Fixed points of Differences of Meromorphic Solutions of Difference Equations

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Applied Mathematics(A Journal of Chinese Universities) 2020年第1期35卷 16-32页

作者： LAN Shuang-ting chen zong-xuan School of Mathematics and Systems Science Guangdong Polytechnic Normal UniversityGuangzhou 510665China School of Mathematical Sciences South China Normal UniversityGuangzhou 510631China

In this paper,we study the di erence equation a1(z)f(z+1)+a0(z)f(z)=0;where a1(z)and a0(z)are entire functions of nite *** some conditions,we obtain some properties,such as xed points,zeros etc.,of the di erences and ... 详细信息

关键词： Difference equation forward difference fixed point

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Matching CCD images to a stellar catalog using locality-sensitive hashing

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Research in Astronomy and Astrophysics 2018年第2期18卷 105-114页

作者： Bo Liu Jia-zong yu Qing-yu Peng College of Information Science and Technology Jinan University Sino-French Joint Laboratory for Astrometry Dynamics and Space Science Jinan University

The usage of a subset of observed stars in a CCD image to find their corresponding matched stars in a stellar catalog is an important issue in astronomical research. Subgraph isomorphic-based algorithms are the most widely used methods in star catalog matching. When more subgraph features are provided, the CCD images are recognized better. However, when the navigation feature database is large, the method requires more time to match the observing model. To solve this problem, this study investigates further and improves subgraph isomorphic matching algorithms. We present an algorithm based on a locality-sensitive hashing technique, which allocates quadrilateral models in the navigation feature database into different hash buckets and reduces the search range to the bucket in which the observed quadrilateral model is located. Experimental results indicate the effectivity of our method.

关键词： astronomical databases: miscellaneous -- methods: data analysis -- techniques: imageprocessing

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Effects of Sc and Zr microalloying on the microstructure and mechanical properties of high Cu content 7xxx Al alloy

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International Journal of Minerals,Metallurgy and Materials 2019年第12期26卷 1559-1569页

作者： Chong-yu Liu Guang-biao Teng zong-yi Ma Li-li Wei Bing Zhang Yong chen College of Material Science and Engineering Guilin University of TechnologyGuilin 541004China Guangdong JMA Aluminum Profile Factory(Group)Co. Ltd.Foshan 528200China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

The effects of Sc and Zr microalloying on the microstructure and mechanical properties of a 7xxx Al alloy with high Cu content(7055)during casting,deformation,and heat treatment were *** addition of Sc and Zr not only refined the grains but also transformed theθ-phase into the W-phase in the 7055 *** Sc and Zr additions enhanced the hardness and yield strength of the 7055-T6 alloy by strengthening the grain boundaries and Al3(Sc,Zr)***,a further increase in the Sc and Zr fractions did not refine the grains but instead resulted in the formation of the large-sized W-phase and primary coarse Al3(Sc,Zr)phase and subsequently deteriorated the mechanical properties of the *** 7055 alloy with 0.25Sc addition exhibited the best mechanical property among the prepared alloys.

关键词： aluminum alloys microstructural evolution mechanical property grain refinement

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