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Roll gap prediction in acceleration and deceleration process of cold rolling based on a data-driven method

Journal of Iron and Steel Research International 2023年第5期30卷 1013-1021页

作者： yun-jian hu Jie Sun huai-tao Shi Qing-long Wang jian-zhao Cao School of Mechanical Engineering Shenyang Jianzhu UniversityShenyang 110168LiaoningChina The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina Department of Mechanical Engineering North China Electric Power UniversityBaoding 071003HebeiChina

Severe fluctuation of the effective roll gap in the acceleration and deceleration section of the cold rolling process is a significant factor causing thickness ***,the conventional roll gap compensation method and control strategy do not meet the stringent strip quality *** roll gap model in the acceleration and deceleration process is studied to increase the thickness control *** order to improve model accuracy,a roll gap prediction method based on data-driven is *** the complexities of the cold rolling process,the extreme gradient boosting(XGBoost)method is used to predict the roll gap model as the rolling speed ***,support vector regression and neural network-based methods are taken to evaluate and compare the prediction *** on the field data,the simulation experiments are carried *** demonstrated that the prediction performance of the proposed method outperformed the other two *** values of root mean square error,determination coefficient value,mean absolute percentage error and mean absolute error obtained from the XGBoost model were equal to 0.000346,0.952,7.02,and 0.00028,*** addition,the proposed method analyzed the contribution rates of the rolling affecting parameters on the roll *** data showed that in the controllable rolling parameters,the rolling speed is the most impacting factor that disturbs the roll gap model in the acceleration and deceleration process,which can provide a useful direction for actual roll gap adjustment.

关键词： Cold rolling Acceleration Deceleration Roll gap model Extreme gradient boosting Contribution rate Analysis

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Application of distributed model predictive control based on neighborhood optimization in gauge-looper integrated system of tandem hot rolling

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Journal of Iron and Steel Research International 2023年第2期30卷 277-292页

作者： Jie Sun Fan Hou yun-jian hu Long-jun Wang Hao-yue Jin Wen Peng Xiao-jian Li Dian-hua Zhang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina

To solve the coupling relationship between the strip automatic gauge control and the looper control in traditional control strategy of tandem hot rolling,a distributed model predictive control(DMPC)strategy for the tandem hot rolling was explored,and a series of simulation experiments were carried ***,based on the state space analysis method,the multivariable dynamic transition process of hot strip rolling was studied,and the state space model of a gauge-looper integrated system in tandem hot rolling was ***,DMPC strategy based on neighborhood optimization was proposed,which fully considered the coupling relationship in this integrated ***,a series of experiments simulating disturbances and emergency situations were completed with actual rolling *** experimental results showed that the proposed DMPC control strategy had better performance compared with the traditional proportional-integral control and centralized model predictive control,which is applicable for the gauge-looper integrated system.

关键词： Tandem hot rolling Gauge Looper integrated system State space model Distributed model predictive control Neighborhood optimization

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Mitogenome-based phylogeny of mosquitoes(Diptera:Culicidae)

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Insect Science 2024年第2期31卷 599-612页

作者： De-Hong Chen Shu-Lin He Wen-Bo Fu Zhen-Tian Yan yun-jian hu huan Yuan Ming-Bin Wang Bin Chen Chongqing Key Laboratory of Vector Insects Institute of Entomology and Molecular BiologyChongqing Normal UniversityChongqingChina

Mosquitoes are of great medical significance as vectors of many deadly *** have been widely used in phylogenetic studies,but mitogenome knowledge within the family Culicidae is limited,and Culicidae phylogeny is far from *** this study,we surveyed the mitogenomes of 149 Culicidae species,including 7 newly sequenced *** analysis of 149 mosquito mitogenomes shows gene composition and order to be identical to that of an ancestral insect,and the AT bias,length variation,and codon usage are all consistent with that of other reported Dipteran *** analyses based on the DNA sequences of the 13 protein-coding genes from the 149 species robustly support the monophyly of the subfamily Anophelinae and the tribes Aedini,Culicini,Mansonini,Sabethini,and *** resolve ambiguous relationships between clades within the subfamily Culicinae,we performed topological tests and show that Aedini is a sister to Culicini and that Uranotaenini is a sister to(Mansonini)+(Toxorhynchitini+Sabethini).In addition,we estimated divergence times using a Bayesian relaxation clock based on the sequence data and 3 fossil calibration *** results show mosquitoes diverged during the Early Jurassic with massive Culicinae radiations during the Cretaceous,coincident with the emergence of angiosperms and the burst of mammals and ***,this study,which uses the largest number of Culicidae mitogenomes sequenced to date,comprehensively reveals the mitogenome characteristics and mitogenome-based phylogeny and divergence times of Culicidae,providing information for further studies on the mitogenome,phylogeny,evolution,and taxonomic revision of Culicidae.

关键词： characterization Culicidae evolution mitogenomes mosquitoes phylogeny

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Structural designs and mechanism insights into electrocatalytic oxidation of 5-hydroxymethylfurfural

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Journal of Energy Chemistry 2025年第1期100卷 792-814页

作者： Jing Lei huijie Zhang jian Yang Jia Ran Jiqiang Ning Haiyan Wang Yong hu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Department of Chemistry Zhejiang Normal University Jinhua Advanced Research Institute Department of Optical Science and Engineering Fudan University College of Chemistry and Materials Engineering Zhejiang A&F University

Biomass conversion offers an efficient approach to alleviate the energy and environmental *** oxidation of 5-hydroxymethylfurfural(HMF) has attracted tremendous attention in the latest few years for the mild synthesis conditions and high conversion efficiency to obtain 2,5-furan dicarboxylic acid(FDCA), but there still remain problems such as limited yield, short cycle life,and ambiguous reaction mechanism. Despite many reviews highlighting a variety of electrocatalysts for electrochemical oxidation of HMF, a detailed discussion of the structural modulation of catalyst and the underlying catalytic mechanism is still lacking. We herein provide a comprehensive summary of the recent development of electrochemical oxidation of HMF to FDCA, particularly focusing on the mechanism studies as well as the advanced strategies developed to regulate the structure and optimize the performance of the electrocatalysts, including heterointerface construction, defect engineering,single-atom engineering, and in situ reconstruction. Experimental characterization techniques and theoretical calculation methods for mechanism and active site studies are elaborated, and challenges and future directions of electrochemical oxidation of HMF are also prospected. This review will provide guidance for designing advanced catalysts and deepening the understanding of the reaction mechanism beneath electrochemical oxidation of HMF to FDCA.

关键词： Structural design

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Transforming waste particles into valuable adsorbents via amyloid-mediated molecular engineering

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Science China Chemistry 2025年第1期68卷 317-328页

作者： Qingmin Yang jian Zhao Yujia Zhang Xingyu Zhou Hao Ren Bowen hu Zhongli Lei Lixin Chen Peng Yang School of Material and Chemical Engineering Bengbu University Anhui Provincial Engineering Laboratory of Silicon-Based Materials School of Chemistry and Chemical Engineering Northwestern Polytechnical University Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education School of Chemistry and Chemical EngineeringShaanxi Normal University Xi'an Key Laboratory of Polymeric Soft Matter School of Chemistry and Chemical Engineering Shaanxi Normal University International Joint Research Center on Functional Fiber and Soft Smart Textile School of Chemistry and Chemical EngineeringShaanxi Normal University

The high-value utilization of industrial solid waste using a facile and eco-friendly process is of great interest and significance in reducing environmental pollution and developing a green circular economy. Herein, we propose an amyloid-mediated molecular engineering strategy to transform particulate waste into valuable adsorbents for metal ions. Our method has the advantage of aqueous solution fabrication under mild conditions without the use of high-temperature hydrothermal methods and toxic chemical reagents. Amyloid-mediated molecular engineering manipulates the phase transition of bovine serum albumin(BSA)on particulate waste surfaces, resulting in a remarkable ～3.1 times improvement in the adsorption capacity of fly ash, a typical industrial solid waste for gold ions after modification with the phase-transitioned BSA(PTB). The resultant adsorption ability was 69–1,980 times higher than those of conventional and emerging adsorbent materials such as ion exchange resins, activated carbon(AC), covalent organic frameworks(COFs), and metal-organic frameworks(MOFs). We further demonstrated the application of our PTB-modified materials in the recovery of precious metals from low-grade gold ore and electronic waste leachates. Consequently, this strategy could increase the value of waste materials nearly 27 times. In addition, this method is generally extendable to other conventional industrial adsorbents such as resin, clay, and Al2O3, and enhances their adsorption capabilities at least twofold. Overall, this work provides a simple and green approach for improving the adsorption performance of solid particles, and is expected to develop into a universal strategy for transforming waste particles into high-value-added products.

关键词： amyloid-like protein aggregates surface engineering fly ash solid waste adsorption

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Evaluation of Rapid Detection of Nasopharyngeal Colonization with MRSA by Real-Time PCR

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国际感染病学（电子版） 2012年第1期1卷 -页

作者： Feng-feng Kang Shu-yan Cao Yan-ming Li jiang-tao Li Qing He Yi Li yun-jian hu Beijing Hospital Ministry of Health Institution of Laboratory Medicine Xiangya School of MedicineCentral South University

Objective To investigate the clinical application of Real-Time PCR for rapid detection of methicillin-resistant Staphylococcus aureus(MRSA) directly from nasopharyngeal swab *** We collected the nasal and throat swab specimens from patients or medical staffs in 3 intensive care units,blood laminar flow ward and respiratory ward in Beijing Hospital,Ministry of Health from December 2010to April *** sample was tested by RT-PCR and conventional culture-based method for the presence of *** The total number of the specimens was *** with the conventional culture-based method,we demonstrated the diagnostic values for Real-Time PCR were 96.4%sensitivity,96.6%specificity,81.8%positive predictive rate,and 99.4%negative predictive *** the limit of detection was 10~2CFU/*** This Real-Time PCR is a simple,rapid,sensitive and specific *** the high negative predictive value,it can be used for the exclusion of MRSA colonization or ***,the application of its low positive predictive value should be further evaluated.

关键词： Real-Time PCR MRSA Nasopharyngeal swab

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Maintaining moderate levels of hypochlorous acid promotes neural stem cell proliferation and differentiation in the recovery phase of stroke

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Neural Regeneration Research 2025年第3期20卷 845-857页

作者： Lin-Yan huang Yi-De Zhang Jie Chen Hai-Di Fan Wan Wang Bin Wang Ju-yun Ma Peng-Peng Li Hai-Wei Pu Xin-Yian Guo jian-Gang Shen Su-hua Qi School of Medical Technology Xuzhou Key Laboratory of Laboratory DiagnosticsXuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Pharmacy Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina Department of Laboratory Medicine Branch Hospital of Huai’an First People’s HospitalHuai’anJiangsu ProvinceChina Department of Laboratory Medicine the Affiliated Hospital of Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Chinese Medicine The University of Hong KongHong Kong Special Administrative RegionChina

It has been shown clinically that continuous removal of ischemia/reperfusion-induced reactive oxygen species is not conducive to the recovery of late ***,previous studies have shown that excessive increases in hypochlorous acid after stroke can cause severe damage to brain *** previous studies have found that a small amount of hypochlorous acid still exists in the later stage of stroke,but its specific role and mechanism are currently *** simulate stroke in vivo,a middle cerebral artery occlusion rat model was established,with an oxygen-glucose deprivation/reoxygenation model established in vitro to mimic *** found that in the early stage(within 24 hours)of ischemic stroke,neutrophils produced a large amount of hypochlorous acid,while in the recovery phase(10 days after stroke),microglia were activated and produced a small amount of hypochlorous ***,in acute stroke in rats,hypochlorous acid production was prevented using a hypochlorous acid scavenger,taurine,or myeloperoxidase inhibitor,4-aminobenzoic acid *** results showed that high levels of hypochlorous acid(200μM)induced neuronal apoptosis after oxygen/glucose deprivation/***,in the recovery phase of the middle cerebral artery occlusion model,a moderate level of hypochlorous acid promoted the proliferation and differentiation of neural stem cells into neurons and *** suggests that hypochlorous acid plays different roles at different phases of cerebral ischemia/reperfusion *** levels of hypochlorous acid(5 and 100μM)promoted nuclear translocation ofβ-*** transfection of single-site mutation plasmids,we found that hypochlorous acid induced chlorination of theβ-catenin tyrosine 30 residue,which promoted nuclear ***,our study indicates that maintaining low levels of hypochlorous acid plays a key role in the recovery of neurological function.

关键词： cell differentiation cerebral ischemia/reperfusion injury chlorination hypochlorous acid microglia neural stem cell neurogenesis nuclear translocation stroke β-catenin

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热带大西洋表层环流及其月变化特征的分析

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海洋学报 2004年第6期26卷 1-12页

作者：邱云胡建宇厦门大学海洋系亚热带海洋研究所福建厦门361005

应用1993年4月至2001年3月的TOPEX/Poseidon卫星高度计遥感资料,分析了8a平均热带大西洋(15°S～25°N,5°～50°W)表层环流结构的月变化特征.研究结果表明:热带大西洋表层环流中高纬度海区流速较小,赤道附近流速较大,表层环流系统大部... 详细信息

应用1993年4月至2001年3月的TOPEX/Poseidon卫星高度计遥感资料,分析了8a平均热带大西洋(15°S～25°N,5°～50°W)表层环流结构的月变化特征.研究结果表明:热带大西洋表层环流中高纬度海区流速较小,赤道附近流速较大,表层环流系统大部分流系月变化不明显,部分流系月际波动较显著.具体来说,西南向的北赤道流下半年的纬向流速分量比上半年大.非洲沿岸流在5～11月流向为东北向,在其他月份主要为东南向.北赤道逆流可以分成两部分:25°W以东海区,北赤道逆流常年流向向东,到9月份前后流速达到最大值(约0 25cm/s);25°W以西海区,7月至翌年1月流向向东,2～6月北赤道逆流减小,并有西向流产生.2°S～2°N,15°W以东海区的南赤道流在1～3月、9～10月流向向东,其他月份流向向西.南赤道流可认为是由南、北两支西向的海流构成,这两支海流的流轴分别位于6°S和1°N,在6～7月北支流速达到最大值0 6m/s.南美洲纳塔耳东部西北向的北巴西海流流速月际变化不大,在5～6月份流速达到最大值0 3～0 4m/s.相应的卫星风场遥感资料的分析表明热带大西洋表层环流结构的月变化特征与风场的分布及变化有较好的对应关系.用WorldOceanAtlas2001的月平均温盐数据反演出来的表层地转流场以及卫星跟踪ARGOS漂流浮标观测进行的对比验证表明,

关键词： TOPEX/Poseidon 热带大西洋地转流月变化

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果园环境下苹果侦测与定位方法研究现状与展望

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中国农业科技导报 2017年第2期19卷 65-74页

作者：夏雪丘耘王健胡林崔运鹏樊景超郭秀明周国民中国农业科学院农业信息研究所北京100081

随着信息技术的快速发展,果园管理逐步走向数字化、机械化和智能化。果园环境下苹果的精确侦测与定位成为实现果实作业自动化的关键。总结了苹果侦测中的视觉数据获取方法、图像预处理方法和果实图像分割方法,分析了苹果侦测中遮挡和重... 详细信息

随着信息技术的快速发展,果园管理逐步走向数字化、机械化和智能化。果园环境下苹果的精确侦测与定位成为实现果实作业自动化的关键。总结了苹果侦测中的视觉数据获取方法、图像预处理方法和果实图像分割方法,分析了苹果侦测中遮挡和重叠问题的处理方法,归纳了目标果实定位的主要方法和原理,探讨了苹果侦测与定位研究中存在的挑战,并对未来发展趋势进行了展望,以期为进一步开展果园信息化研究提供参考。

关键词：苹果侦测定位方法机器视觉果园环境

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Event-triggered adaptive control for attitude tracking of spacecraft

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Chinese Journal of Aeronautics 2019年第2期32卷 454-462页

作者： Chenliang WANG yun LI Qinglei hu jian huANG School of Automation Science and Electrical Engineering Beihang University Beijing Institute of Automatic Control Equipment

Plug-and-play technology is an important direction for future development of spacecraft and how to design controllers with less communication burden and satisfactory performance is of great importance for plug-and-play spacecraft. Considering attitude tracking of such spacecraft with unknown inertial parameters and unknown disturbances, an event-triggered adaptive backstepping controller is designed in this paper. Particularly, a switching threshold strategy is employed to design the event-triggering mechanism. By introducing a new linear time-varying model, a smooth function, an integrable auxiliary signal and a bound estimation approach, the impacts of the network-induced error and the disturbances are effectively compensated for and Zeno phenomenon is successfully avoided. It is shown that all signals of the closed-loop system are globally uniformly bounded and both the attitude tracking error and the angular velocity tracking error converge to zero. Compared with conventional control schemes, the proposed scheme significantly reduces the communication burden while providing stable and accurate response for attitude maneuvers. Simulation results are presented to illustrate the effectiveness of the proposed scheme.

关键词： Adaptive control Attitude tracking Event-triggered control Spacecraft Uncertainties

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