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Flow field, heat transfer and inclusion behavior in a round bloom mold under effect of a swirling flow submerged entry nozzle

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Journal of Iron and Steel Research International 2023年第6期30卷 1211-1221页

作者： qing-hua Xie Pei-yuan ni Toshihiro Tanaka Mikael Ersson Ying Li Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina Liaoning Key Laboratory of Metallurgical Sensor Materials and Technology School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina Graduate School of Engineering Osaka UniversityOsaka 565-0871Japan Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden

Flow field,heat transfer and inclusion behavior in a 700 mm round bloom mold under the effect of a swirling flow submerged entry nozzle(SEN)were investigated with the aim to enhance the casting *** results indicate that the impinging flow phenomenon,which is commonly observed in conventional single-port SEN casting,was completely suppressed by the swirling flow SEN coming from a novel swirling flow generator design in *** from the SEN port moved towards the mold wall in 360 direction,leading to a uniform temperature distribution in the *** to a conventional single-port SEN casting,the steel super-heat was decreased by about 5 K at the mold center,and the temperature was increased by around 3.5 K near the *** addition,the removal ratio of inclusions to the mold top surface in the swirling flow SEN casting was found to be ***,the removal ratio of spherical inclusions with diameters of 1,10,50 and 100μm was increased by 18.2%,18.5%,22.6% and 42.7%,***,the ratio was raised by 18.2%,20.8%,21.5% and 44.1%for non-spherical inclusions,respectively.

关键词： Large round bloom Swirling flow submerged entry nozzle casting Flow field Heat transfer Inclusion behavior

Screen printing fabricating patterned and customized full paper-based energy storage devices with excellent photothermal,self-healing,high energy density and good electromagnetic shielding performances

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Journal of Materials Science & Technology 2022年第2期97卷 190-200页

作者： Chuanyin Xiong Mengrui Li qing Han Wei Zhao Lei Dai Yonghao ni College of Bioresources Chemistry&Materials Engineering Shaanxi University of Science and TechnologyShaanxi Prov Key Lab Papermaking Technol&SpeciaXi’an 710021China University of New Brunswick Limerick Pulp&Paper CtrFrederictonNB E3B 5A3Canada

Supercapacitors are favored by researchers because of their high power density,especially with the acceleration of people’s life ***,their energy density,especially from the point of view of the whole energy storage device,is far lower than that of commercial *** this work,a kind of customizable full paper-based supercapacitor device with excellent self-healing ability is fabricated by simple and low-cost screen printing,electropolymerization and dip coating *** resultant separatorfree supercapacitor device exhibits both ultrahigh gravimetric and areal specific energy(power)densities of 39 Wh kg^(-1)(69 k W kg^(-1))and 692μWh cm^(-2)(236 m W cm^(-2)),achieving excellent supercapacitor ***,the addition of vitrimers endows the whole device with outstanding self-healing properties,which is helpful for enhancing the adaptability of the device to the *** addition,this kind of paper-based device also displays good photothermal and electromagnetic shielding *** striking features make paper matrix composites attractive in the fields of supercapacitors,medical photothermal treatment and electromagnetic shielding.

关键词： Customizable full paper-based supercapacitors Energy density Self-healing Photothermal Electromagnetic shielding

Simultaneous anti-windup synthesis for linear systems subject to actuator saturation

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Journal of Systems Engineering and Electronics 2015年第1期26卷 119-126页

作者： Maopeng Ran qing Wang Chaoyang Dong Maolin ni School of Automation Science and Electrical Engineering Beihang University School of Aeronautic Science and Engineering Beihang University Chinese Society of Astronautics

A synthesis method for global stability and performance of input constrained linear systems, which uses a linear outputfeedback controller and a static anti-windup compensator is investigated. Different from the traditional two-step anti-windup design procedure, the proposed method synthesizes all controller parameters simultaneously. Sufficient conditions for global stability and minimizing the induced L2 gain are formulated and solved as a linear matrix inequalities（LMIs） optimization problem, which also provides an opportunity to search for a better performance tradeoff between the linear controller and the anti-windup *** well-posedness of the close-loop system is also *** results show the effectiveness of the proposed method.

关键词： actuator saturation anti-windup simultaneous synthesis L2 synthesis linear matrix inequalities(LMIs)

A novel intelligent vehicle risk assessment method combined with multi-sensor fusion in dense traffic environment

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Journal of Intelligent and Connected Vehicles 2018年第2期1卷 41-54页

作者： Xunjia Zheng Bin Huang Daiheng ni qing Xu Tsinghua University BeijingChina Department of Civil and Environmental Engineering Amherst College of EngineeringUniversity of MassachusettsAmherstMassachusettsUSA

Purpose–The purpose of this paper is to accurately capture the risks which are caused by each road user in ***/methodology/approach–The authors proposed a novel risk assessment approach based on the multi-sensor fusion algorithm in the real trafﬁc ***,they proposed a novel detection-level fusion approach for multi-object perception in dense trafﬁc environment based on evidence *** approach integrated four states of track life into a generic fusion framework to improve the performance of multi-object *** information of object type,position and velocity was accurately ***,they conducted several experiments in real dense trafﬁc environment on highways and urban roads,which enabled them to propose a novel road trafﬁc risk modeling approach based on the dynamic analysis of vehicles in a variety of driving *** analyzing the generation process of trafﬁc risks between vehicles and the road environment,the equivalent forces of vehicle–vehicle and vehicle–road were presented and theoretically *** prediction steering angle and trajectory were considered in the determination of trafﬁc risk inﬂuence ***–The results of multi-object perception in the experiments showed that the proposed fusion approach achieved low false and missing tracking,and the road trafﬁc risk was described as aﬁeld of equivalent *** results extend the understanding of the trafﬁc risk,which supported that the trafﬁc risk from the front and back of the vehicle can be perceived in ***/value–This approach integrated four states of track life into a generic fusion framework to improve the performance of multi-object *** information of object type,position and velocity was used to reduce erroneous data association between tracks and ***,the authors conducted several experiments in real dense trafﬁc environment on highways and urban roads,which enabled them to propose a novel road trafﬁc

关键词： Automated vehicles Advanced vehicle safety systems Autonomous driving Connected vehicles Environment perception Sensor information fusion

Microstructure and Tribological Behavior of a TiO_2/hBN Composite Ceramic Coating Formed via Micro-arc Oxidation of Ti–6Al–4V Alloy

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Journal of Materials Science & Technology 2016年第10期32卷 1071-1076页

作者： ni Ao Daoxin Liu Shuaixing Wang qing Zhao Xiaohua Zhang Mengmeng Zhang College of Aeronautics Institute of Corrosion and Protection Northwestern Polytechnical University National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology Nanchang Hangkong University

A composite coating containing hexagonal boron nitride（hBN） particles and titanium oxide（TiO_2） was formed on the surface of Ti-6Al-4V alloy via micro-arc oxidation（MAO）. The effect of quantity of the hBN-particles added into electrolyte on microstructure, composition, and wear behavior of the resulting composite coatings was investigated. Microstructure, phase composition, and tribological behavior of the resulting MAO coatings were evaluated via scanning electron microscopy, X-ray diffraction, and ball-on-disc abrasive tests. The results reveal that the TiO_2/hBN composite coating consisting of rutile TiO_2, anatase TiO_2, and an hBN phase was less porous than particle-free coating. Furthermore, the presence of hBN particles in the MAO coating produced an improved anti-friction property. The composite coating produced in the electrolyte containing 2 g/L of hBN particles exhibited the best wear *** outer loose layer of the MAO coatings was removed by a mechanical polishing process, which led to a significant improvement in the wear resistance and anti-friction properties of the MAO coatings and highlighted an essential lubricating role of hBN particles in the composite coatings. However, wear mechanism of the MAO coatings was not relevant to the presence of hBN particles, where fatigue wear dominated the anti-fraction properties of the MAO coatings with and without hBN particles.

关键词： Ti-6Al-4V alloy Micro arc oxidation hBN particle Wear

A Structured Ultramicroporous Metal-Organic Framework for Carbon Dioxide Capture

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Chinese Journal of Chemistry 2023年第7期41卷 763-768页

作者： Shao-Min Wang Hao-Ran Liu Shuang ni qing-Yuan Yang School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'anShaanxi710049 China

Comprehensive Summary Carbon dioxide(CO_(2))capture is one of the most important aspects of reducing global *** terms of CO_(2)capture,metal-organic frameworks(MOFs)have several ***,it isn't easy to shape MOFs while maintaining their ***,we describe the development of a pellet-shaped ultramicroporous MOF,ni(3-ain)2(3-ain=3-aminoinoisonicotinic acid),that is capable of selectively adsorbing CO_(2).Polyvinyl butyral(PVB)is used as a binder during the production of ni(3-ain)2 MOF *** adequately shaped material can maintain its crystallinity and exhibit a high CO_(2)adsorption capacity(3.73 mmol·g^(-1))at ambient conditions,which is significantly greater than those obtained for N_(2)(0.63 mmol·g^(-1))and CO(0.90 mmol·g^(-1)).Consequently,this material displays high IAST selectivities for CO_(2)/N_(2)(26.3,15/85,V/V)and CO_(2)/CO(19.2,1/99,V/V).According to the theoretical calculations,ni(3-ain)2 preferentially adsorbs CO_(2)molecules over N_(2)molecules and CO *** results of experiments on dynamic breakthrough have demonstrated that ni(3-ain)2 pellets are capable of effectively separating CO_(2)/N_(2)or CO_(2)/CO mixtures under conditions of dynamic ***,the structured MOF materials can be synthesized in one step at kilogram *** work provides an avenue for the shaping of MOFs for potential industrial applications in the future.

关键词： Metal-organic framework Shaping Separation Carbon capturel Crystal engineering Microporous materials

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智能网联汽车的车载网络攻防技术研究进展

软件学报 2025年第1期36卷 341-370页

作者：陈博言沈晴霓张晓磊张鑫李聪吴中海北京大学软件与微电子学院软件工程国家工程研究中心(北京大学) 高可信软件技术教育部重点实验室(北京大学) 北京大学计算机学院

随着人工智能和5G技术在汽车行业的应用,智能网联汽车应运而生,它是一种由众多来自不同供应商的电子控制单元(ECU)组成的复杂分布式异构系统,通过以CAN为代表的车载网络协议交互协同控制各ECU.然而,攻击者可能通过各种接口攻击智能网联... 详细信息

随着人工智能和5G技术在汽车行业的应用,智能网联汽车应运而生,它是一种由众多来自不同供应商的电子控制单元(ECU)组成的复杂分布式异构系统,通过以CAN为代表的车载网络协议交互协同控制各ECU.然而,攻击者可能通过各种接口攻击智能网联汽车,渗透到车载网络,再攻击车载网络及其各组成部分如ECU.因此,智能网联汽车的车载网络安全成为近些年车辆安全研究的焦点之一.在介绍智能网联汽车整体结构、ECU、CAN总线和车载诊断协议等基础之上,首先总结了目前车载网络协议的逆向工程技术进展,逆向工程的目标是获取汽车行业通常不公开的车载网络协议实现细节,也是实施攻击和防御的前提条件.然后从车载网络攻、防两个角度展开:一方面概括了车载网络攻击向量及主要攻击技术,包括通过物理访问和远程访问方式实施的攻击技术,以及针对ECU和CAN总线实施的攻击技术;另一方面,讨论了车载网络现有的防御技术,包括基于特征工程和机器学习方法的车载网络入侵检测和基于密码学方法的车载网络协议安全增强技术.最后展望了未来的研究方向.

关键词：智能网联汽车车载网络逆向工程入侵检测协议安全增强

Relative hepatic weight using body weight may be not accurate

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World Journal of Pediatrics 2017年第2期13卷 186-187页

作者： Xiu-Juan Yang Shao-qing ni Department of Pediatrics The First Affiliated Hospital of Zhejiang Chinese Medical UniversityHangzhouChina The National Clinical Trial Institute Children's HospitalZhejiang University School of MedicineHangzhou 310020China

We read the paper entitled'A high-fat highenergy diet influences hepatic CYP3A expression and activity in low-birth-weight developing female rats'published in the recent issue of the Journal.[1]The authors investigated the effects of a high-fat,high-energy diet(HFHE diet)on the hepatic expression of CYP3A in low-birth-weight developing female *** they concluded that an HFHE diet can result in alterations of CYP3A expression in a developmental low birth-weight rat model.

关键词： Relative CYP3A Birth-weight

Bcl6 Suppresses Cardiac Fibroblast Activation and Function via Directly Binding to Smad4

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Current Medical Science 2019年第4期39卷 534-540页

作者： Jian ni qing-qing WU Hai-han LIAO Di FAN Qi-zhu TANG Department of Cardiology Renmin Hospital of Wuhan UniversityWuhan 430060China Cardiovascular Research Institute of Wuhan University Wuhan 430060China Hubei Key Laboratory of Cardiology Wuhan 430060China

Bcl6,a critical pro-oncogene of human B-cell lymphomas,can promote tumor *** studies have found that Bcl6 participates in hypoxia injury in ***,the effect of Bcl6 on cardiac fibroblasts is still *** aim of this study was to elucidate the functional role of Bcl6 in cardiac fibroblast activation and *** neonatal rat cardiac fibroblasts were isolated and ***,transforming growth factor β1 (TGFβ1) was used to stimulate fibroblast activation.A decreased expression level of Bcl6 was observed in fibroblasts after stimulation with TGFβ***,cells were transfected with adenovirus Bcl6 to overexpress *** results showed that Bcl6 overexpression induced decreased proliferation and reduced activation of fibroblasts which were stimulated with TGFβ*** was found that activated smad2 and smad3 were not changed by overexpressing Bcl6,but smad4 was ***,co-immunoprecipitation results showed that Bcl6 directly bound to smad4,and induced down-regulation of *** last,smad4 activator could counteract the anti-fibroblast effects of *** conclusion,Bcl6 may negatively regulate cardiac fibroblast activation and function by directly binding to smad4.

关键词： Bcl6 cardiac fibroblast transforming growth factor β1 smad4