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Simulation of gas-solid flow in sinter vertical cooling furnace

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Journal of Iron and Steel Research International 2023年第11期30卷 2133-2142页

作者： teng-fei qi Hai-feng Li Jun-jie Sun Guo-jun Chen Yong-jie Zhang School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Key Laboratory for Ecological Metallurgy of Multi-Metallic Mineral(Ministry of Education) Northeastern UniversityShenyang110819LiaoningChina Technology Center Shanghai Meishan Iron and Steel Co.Ltd.Nanjing210039JiangsuChina Central Research Institute Baosteel Co.Ltd.Shanghai201900China

The velocity distribution of sinter and gas in vertical cooling furnace(VCF)has an important influence on gas-solid heat *** on the slot model of single hopper in the VCF of Meishan Iron and Steel Co.,Ltd.,the velocity and particle size distribution of sinter and the velocity and pressure distribution of gas were studied using a computational fluid dynamics-discrete element method model to obtain the gas-solid flow rule in the *** results showed that the velocity of sinter near the wall and the edge of vent cowl was lower than that in the rest of the same ***,the rectangular section of the vertical cooling furnace can be divided into a quasi-static zone,a plug flow zone and a convergent flow zone according to the flow velocity of the *** average particle size and the void fraction of sinter bed were distributed in"W"and"V"shape along the width direction,*** distribution of gas velocity in the furnace cavity was uneven,and the high-velocity area gradually changed from the center to the edge of the furnace cavity with the rise of *** the ratio of edge to center gas flow from 2.7∶1 to 0.7∶1 could improve the gas velocity,but could not change the gas velocity *** gas velocity distribution was more affected by the average particle size distribution of the sinter *** was suggested that measures need be taken to adjust it to improve the gas velocity distribution in the VCF.

关键词： Sinter Vertical cooling furnace Average particle size Void fraction Velocity distribution Gas distribution mode

以连盐铁路建设为契机构建“一核三带”产业布局——对连云港铁路运输格局重大变化的思考

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江苏海洋大学学报（人文社会科学版） 2012年第12期10卷 135-137页

作者：滕祁飞中共连云港市委员会机要局江苏连云港222006

国家决策进行"连盐铁路"建设,对于加快构建以连云港为中心的区域经济发展新格局是一个重大的机遇。在阐述"连盐铁路"建设促进区域经济发展功能和作用的基础上,对构建连云港市"一核三带"产业布局进行了思考,提出了"一核三带"产业布局的... 详细信息

国家决策进行"连盐铁路"建设,对于加快构建以连云港为中心的区域经济发展新格局是一个重大的机遇。在阐述"连盐铁路"建设促进区域经济发展功能和作用的基础上,对构建连云港市"一核三带"产业布局进行了思考,提出了"一核三带"产业布局的政策建议。

关键词： “连盐铁路” 机遇连云港产业布局 “一核三带”

Clinical Features and Corrected Factors with Neurosyphilis in HIV/Syphilis Co-Infected Patients Based on Stage of Syphilis

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International Journal of Dermatology and Venereology 2022年第2期5卷 61-67页

作者： Yuan-Yuan Wang Mei Shi Zhi-Fang Guan Lei Zhang Xin Gu Hai-Kong Lu teng-fei qi Li-Yan Ni Juan Wu Wei Zhao Rui-Rui Peng Lin Zhu Ping-Yu Zhou Sexually Transmitted Disease Institute Shanghai Skin Disease HospitalClinical School of Anhui Medical UniversityShanghai 200050China Sexually Transmitted Disease Institute Shanghai Skin Disease HospitalTongji UniversitySchool of MedicineShanghai 200050China China-Australia Joint Research Center for Infectious Diseases School of Public HealthXi’an Jiaotong University Health Science CentreXi’anShaanxi 710049China Melbourne Sexual Health Centre Alfred HealthMelbourne 3800Australia Central Clinical School Faculty of MedicineNursing and Health SciencesMonash UniversityMelbourne 3800Australia Department of Epidemiology and Biostatistics College of Public HealthZhengzhou UniversityZhengzhouHenan 450001China.

Objective: Neurosyphilis is challenging to diagnose, especially in patients with human immunodeficiency virus (HIV)/syphilis co-infection. The aim of this study was to profile the clinical features of neurosyphilis and evaluate the correlation between neurosyphilis and clinical or laboratory factors among patients with HIV/syphilis ***: We retrospectively analyzed the data of 479 HIV/syphilis co-infected patients examined between August 2009 and September 2018. A multivariate logistic regression model was used to identify factors correlated with ***: The overall prevalence of neurosyphilis was 21.7%. The prevalence of neurosyphilis differed among patients with primary (11.1%), secondary (20.1%), and latent syphilis (29.1%). The prevalences of neurosyphilis in patients with serological non-response and serofast patients were 26.1% and 6.3%, respectively, while 12.5% of patients with serological relapse had neurosyphilis. Patients with secondary and latent syphilis had serum rapid plasma reagin (RPR) titers (per unit) of 1.44-fold [95% confidence interval (CI): 1.08-1.93,P= 0.014] and 2.73-fold (95%CI: 1.49-5.00,P= 0.001), respectively, which increased the risk of confirmed neurosyphilis. Among patients with latent syphilis, a serum RPR titer of ≥1:32 and peripheral blood CD4 cell count of ≤350/mL were significantly associated with neurosyphilis, with adjusted odds ratios of 9.45 (95%CI: 1.86-48.03,P= 0.007) and 3.75 (95%CI: 1.11-12.66,P= 0.033), ***: A serum RPR titer of ≥1:32 and a peripheral blood CD4 cell count of ≤350/mL have predictive value in screening for neurosyphilis among HIV-positive patients with latent syphilis.

关键词： human immunodeficiency virus syphilis neurosyphilis correlated factors

Co-occurrence of tabes dorsalis with diplopia: an unusual combination caused by Treponema pallidum

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International Journal of Dermatology and Venereology 2018年第2期1卷 120-122页

作者： Wei Zhao teng-fei qi Juan Wu Hai-Kong Lu Rui-Rui Peng Ping-Yu Zhou Shanghai Skin Disease Hospital Shanghai 200050 China

Introduction Syphilis is a sexually transmitted disease caused by Treponema pallidum (***),and involves in almost all of the *** the nervous and vision system[1] is involved,neurosyphilis *** can invade any part of the neuraxis,and neurosyphilis can occur at any stage of *** has been divided into five major categories,including asymptomatic meningeal,meningovascular,parenchymatous,and gummatous neurosyphilis[2].These entities represent a continuum and frequent overlap[4].

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柴达木盆地三湖坳陷第四系重矿物物源分析

现代地质 2011年第2期25卷 315-321页

作者：刘群明陈开远王键徐雷滕飞启张培智中国石油勘探开发研究院北京100083 中国地质大学能源学院北京100083 北京杰瑞特斯石油技术有限公司北京100101 中国石油川庆钻探长庆录井公司陕西西安710000 胜利油田河口采油厂山东东营247200

岩性圈闭作为三湖坳陷下一步勘探的主要对象,明确物源区及各源区对坳陷内部的影响范围是首要任务。依照重矿物"相关性分析定母岩类型、因子分析定物源主次、Q聚类分析定影响范围、稳定系数分析定物源方向"的研究思路,综合分析研究区内... 详细信息

岩性圈闭作为三湖坳陷下一步勘探的主要对象,明确物源区及各源区对坳陷内部的影响范围是首要任务。依照重矿物"相关性分析定母岩类型、因子分析定物源主次、Q聚类分析定影响范围、稳定系数分析定物源方向"的研究思路,综合分析研究区内所有重矿物数据的数理统计特征,发现工区母岩类型主要为变质岩、中基性喷出岩和少量沉积岩,分别对应南部昆仑山主要物源、东北埃姆尼克山次要物源和北部祁连山弱物源。南部物源主要控制南斜坡区沉积,但其中西南昆仑山—那北分支物源影响范围可达北斜坡台南—涩北气田一带;东北物源对坳陷内部影响范围局限在盐湖、哑叭尔及察尔汗一带;北部物源对区内沉积起微弱作用。

关键词：三湖坳陷重矿物物源分析相关性分析因子分析聚类分析柴达木盆地

Synthetic chromosome evolves the yeast genome

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Science China(Life Sciences) 2019年第5期62卷 708-709页

作者： fei teng Wei Li qi Zhou State Key Laboratory of Stem Cell and Reproductive Biology Institute of Zoology Chinese Academy of Sciences Institute for Stem Cell and Regeneration Chinese Academy of Sciences University of Chinese Academy of Sciences

Genomic structural variations play a critical role in biological function and phenotypic diversity. Although smallscale variations, such as insertion, deletion, and point mutations, have been extensively investigated, studies on largescale structural variations such as segmental duplication,inversion, and chromosome-scale variations remain *** the recent decade。

关键词： Li Synthetic chromosome evolves the yeast genome Figure

Event-Triggered Robust Parallel Optimal Consensus Control for Multiagent Systems

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IEEE/CAA Journal of Automatica Sinica 2025年第1期 40-53页

作者： qinglai Wei Shanshan Jiao qi Dong fei-Yue Wang IEEE the Institute of Systems Engineering Macau University of Science and Technology the State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of Automation Chinese Academy of Sciences the School of Artificial Intelligence University of Chinese Academy of Sciences China Academy of Electronics and Information Technology the State Key Laboratory of Multimodal Artificial Intelligence Systems the School of Artificial Intelligence University of Chinese Academy of Sciences

This paper highlights the utilization of parallel control and adaptive dynamic programming(ADP) for event-triggered robust parallel optimal consensus control(ETRPOC) of uncertain nonlinear continuous-time multiagent systems(MASs).First, the parallel control system, which consists of a virtual control variable and a specific auxiliary variable obtained from the coupled Hamiltonian, allows general systems to be transformed into affine systems. Of interest is the fact that the parallel control technique's introduction provides an unprecedented perspective on eliminating the negative effects of disturbance. Then, an eventtriggered mechanism is adopted to save communication resources while ensuring the system's stability. The coupled HamiltonJacobi(HJ) equation's solution is approximated using a critic neural network(NN), whose weights are updated in response to events. Furthermore, theoretical analysis reveals that the weight estimation error is uniformly ultimately bounded(UUB). Finally,numerical simulations demonstrate the effectiveness of the developed ETRPOC method.

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Application of New Empirical Models Based on Mathematical Statistics in the Through-Flow Analysis

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Journal of Thermal Science 2021年第6期30卷 2087-2098页

作者： fei teng JI Lucheng School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

The through-flow analysis is an important part in the compressor design *** this part,lots of empirical models are used to predict the compressor aerodynamic *** models are all based on the early experimental results of low-load and low-speed compressors;so,they may not be suitable for modern compressor performance *** this study,several empirical models were reviewed,and two new models to estimate the minimum blade profile loss and minimum-loss deviation angle were established using mathematical ***,the original models with poor accuracy were replaced by these two models in through-flow ***,three compressors(Rotor 67,Stage 35,and a 4-stage repeating stage)were simulated using both the original and new *** final results show that the new models have better accuracy in estimating the performance parameters than the original *** indicates that it is feasible to use mathematical statistical methods to establish the empirical models,and this method provides an idea for the improvement of other empirical models in through-flow program.

关键词： through-flow analysis empirical models blade loss deviation regression analysis

Reduced-order proper orthogonal decomposition extrapolating finite volume element format for two-dimensional hyperbolic equations

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Applied Mathematics and Mechanics(English Edition) 2017年第2期38卷 289-310页

作者： Zhendong LUO fei teng School of Mathematics and Physics North China Electric Power University Beijing 102206 China School of Control and Computer Engineering North China Electric Power University Beijing 102206 China

This paper is concerned with establishing a reduced-order extrapolating fi- nite volume element （FVE） format based on proper orthogonal decomposition （POD） for two-dimensional （2D） hyperbolic equations. For this purpose, a semi discrete variational format relative time and a fully discrete FVE format for the 2D hyperbolic equations are built, and a set of snapshots from the very few FVE solutions are extracted on the first very short time interval. Then, the POD basis from the snapshots is formulated, and the reduced-order POD extrapolating FVE format containing very few degrees of freedom but holding sufficiently high accuracy is built. Next, the error estimates of the reduced-order solutions and the algorithm procedure for solving the reduced-order for- mat are furnished. Finally, a numerical example is shown to confirm the correctness of theoretical conclusions. This means that the format is efficient and feasible to solve the 2D hyperbolic equations.

关键词： reduced-order finite volume element (FVE) extrapolating format properorthogonal decomposition (POD) hyperbolic equation error estimate numerical simula-tion