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Construction and Application of Quenching Critical Cooling Rate Model

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Journal of Iron and Steel Research International 2010年第3期17卷 40-45页

作者： FU Tian-liang WANG Ri-qing WANG Zhao-dong WANG guo-dong WANG Ming-tao The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Productive Sector Northern Heavy Industries Group Co Ltd Shenyang 110025 Liaoning China Heat Treatment Workshop Linfen Medium Plate Plant Taiyuan Iron and Steel Group Linfen 041000 Shanxi China

Based on exploring quenching mechanism, three types of quenching critical cooling rate models of mediumcarbon steel and low-carbon steel and low-alloy construction steel were established, as modified Maynier model, Eldis model and isothermal curve model, respectively. During construction process, regression analysis and Newton interpolation method were used for higher calculated precision. Through comparing and analyzing, the superior one was selected to evaluate the full hardening thickness after quenching. According to hardness analyzing, the deviation between predicted hardness distribution and the experimental value is within 6%.

关键词： medium-carbon steel and low-carbon steel low-alloy construction steel critical cooling rate hardenability

Active event-driven reliable defense control for interconnected nonlinear systems under actuator faults and denial-of-service attacks

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Science China(Information Sciences) 2022年第6期65卷 155-171页

作者： Bin guo Songyi DIAN tao ZHAO College of Electrical Engineering Sichuan University

This study investigates the reliable control design for a class of interconnected nonlinear systems subjected to actuator faults, disturbances, and denial-of-service(DoS) attacks. DoS attacks are carried out in both sensor and controller channels. An integrated event-observer-based security sliding mode fault-tolerant control approach is presented to defend against DoS attacks and compensate for faults and *** be more specific, the fuzzy logic system(FLS) theory is used to approximate the unknown nonlinear component first. Using the output measurement and sensor channel triggered output information, an FLS aided nonlinear estimator is put forward, in which the faults and disturbances are reconstructed. Then, to achieve the trajectory tracking purpose in the presence of DoS attacks, actuator faults, and disturbances, an adaptive sliding mode manifold is established, based on which an event-driven mechanism is established and a reliable controller is designed. In the controller scheme, the fault compensation and disturbance rejection mechanisms are also included synchronously. The tracking ability is analyzed using the Lyapunov method and the FLS theory, followed by applications to an interconnected power network system and an interconnected inverted pendulum system to demonstrate the applicability of the proposed method.

关键词： interconnected nonlinear system actuator fault DoS attack disturbance fault-tolerant control event-driven control

Recent progresses in the development of tubular segmented-in-series solid oxide fuel cells:Experimental and numerical study

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 427-442页

作者： Shuo Han tao Wei Sijia Wang Yanlong Zhu Xingtong guo Liang He Xiongzhuang Li qing Huang Daifen Chen School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China

Solid oxide fuel cells(SOFCs)have attracted a great deal of interest because they have the highest efficiency without using any noble metal as catalysts among all the fuel cell ***,traditional SOFCs suffer from having a higher volume,current leakage,complex connections,and difficulty in gas *** solve these problems,Rolls-Royce has fabricated a simple design by stacking cells in series on an insulating porous support,resulting in the tubular segmented-in-series solid oxide fuel cells(SIS-SOFCs),which achieved higher output *** work systematically reviews recent advances in the structures,preparation methods,perform-ances,and stability of tubular SIS-SOFCs in experimental and numerical ***,the challenges and future development of tubular SIS-SOFCs are also *** findings of this work can help guide the direction and inspire innovation of future development in this field.

关键词： solid oxide fuel cell segmented-in-series tubular experimental study numerical study

Deformed dispersion relation constraint with hydrogen atom 1S-2S transition

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Chinese Physics C 2020年第1期44卷 47-52页

作者： Jin Pu guo-Ping Li qing-Quan Jiang Xiao-tao Zu School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China College of Physics and Space Science China West Normal UniversityNanchong 637002China

We use the latest results of the ultra-high accuracy 1S-2S transition experiments in the hydrogen atom to constrain the forms of the deformed dispersion relation in the non-relativistic *** the leading correction of the non-relativistic limit,the experiment sets a limit at an order of magnitude for the desired Planck-scale level,thereby providing another example of the Planck-scale sensitivity in the study of the dispersion relation in controlled laboratory *** the next-to-leading term,the bound is two orders of magnitude away from the Planck scale,however it still amounts to the best limit,in contrast to the previously obtained bound in the non-relativistic limit from the cold-atom-recoil experiments.

关键词： deformed dispersion relation hydrogen atom transition experiment Planck-scale sensitivity

From Fluorescent Probes to the Theranostics Platform

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Chinese Journal of Chemistry 2022年第16期40卷 1964-1974页

作者： Peng Wei qing Wang tao Yi State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative MedicineCollege of ChemistryChemical Engineering and BiotechnologyDonghua UniversityShanghai201620 China Department of Chemistry Fudan UniversityShanghai200438 China

Since the advent of fluorescent probes,they have been widely used in the field of life *** probes can not only light up the cells,tissues and organs,but also be used to explore the bio-distribution of specific types of disease ***,the development of new fluorescent probes capable of recognition of bio-markers is extremely important for the diagnosis of the related ***,we focus on our recent works experienced the evolution from the beginning of simply fluorescent probes to the construction of theranostics *** have developed a series of new fluorescent probes for the detecting and imaging of reactive oxygen species(ROS)and specific enzymes in vitro and in living *** the shift of the fluorescence signal from visible to near-infrared region,we expanded the application of the fluorescent probes from in vitro to in *** recently,we further constructed theranostics platforms to combine the diagnosis immediately with the corresponding treatment.

关键词： Fluorescent probes Imaging agents Prodrugs Theranostics platform Nanoparticles

Detecting DDoS Attacks against Web Server Using Time Series Analysis

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Wuhan University Journal of Natural Sciences 2006年第1期11卷 175-180页

作者： WU qing-tao SHAO Zhi-qing Department of Computer Science and Engineering East China University of Science and Technology Shanghai 200237 China

Distributed Denial of Service （DDoS） attack is a major threat to the availability of Web service. The inherent presence of self-similarity in Web traffic motivates the applicability of time series analysis in the study of the burst feature of DDoS attack. This paper presents a method of detecting DDoS attacks against Web server by analyzing the abrupt change of time series data obtained from Web traffic. Time series data are specified in reference sliding window and test sliding window, and the abrupt change is modeled using Auto-Regressive （AR） process. By comparing two adjacent nonoverlapping windows of the time series, the attack traffic could be detected at a time point. Combined with alarm correlation and location correlation, not only the presence of DDoS attack, but also its occurring time and location can be deter mined. The experimental results in a test environment are illustrated to justify our method.

关键词： distributed denial of service auto-regressive model time series Web server

Complex liver retransplantation to treat graft loss due to long-term biliary tract complication after liver transplantation: A case report

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World Journal of Clinical Cases 2020年第3期8卷 568-576页

作者： Jiang Li qing-Jun guo Wen-tao Jiang Hong Zheng Zhong-Yang Shen Department of Liver Transplant Tianjin First Central Hospital

BACKGROUND Loss of graft function after liver transplantation(LT) inevitably requires liver retransplant. Retransplantation of the liver(Re LT) remains controversial because of inferior outcomes compared with the primary orthotopic LT(OLT).Meanwhile, if accompanied by vascular complications such as arterial and portal vein(PV) stenosis or thrombosis, it will increase difficulties of surgery. We hereby introduce our center’s experience in Re LT through a complicated case of *** SUMMARY We report a patient who suffered from hepatitis B-associated cirrhosis and underwent LT in December 2012. Early postoperative recovery was *** months after LT, the patient’s bilirubin increased significantly and he was diagnosed with an ischemic-type biliary lesion caused by hepatic artery occlusion. The patient underwent percutaneous transhepatic cholangial drainage and repeatedly replaced intrahepatic biliary drainage tube regularly for 5 *** patient developed progressive deterioration of liver function and underwent liver re-transplant in January 2019. The operation was performed in a classic OLT manner without venous bypass. Both the hepatic artery and PV were occluded and could not be used for anastomosis. The donor PV was anastomosed with the recipient’s left renal vein. The donor hepatic artery was connected to the recipient’s abdominal aorta. The bile duct reconstruction was performed in an end-to-end manner. The postoperative process was very uneventful and the patient was discharged 1 mo after *** With the development of surgical techniques, portal thrombosis and arterial occlusion are no longer contraindications for ReLT.

关键词： Liver retransplantation Biliary tract complication Ischemic type biliary lesion Portal vein thrombosis Arterial occlusion Graft liver failure Case report

Non-existence of Multi-peak Solutions to the Schrödinger-Newton System with L2-constraint

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Acta Mathematicae Applicatae Sinica 2023年第4期39卷 868-877页

作者： qing guo Li-xiu DUAN College of Science Minzu University of ChinaBeijing 100081China

In this paper, we are concerned with the the Schrödinger-Newton system with L^(2)-constraint. Precisely, we prove that there cannot exist multi-peak normalized solutions concentrating at k different critical points of V(x) under certain assumptions on asymptotic behavior of V(x) and its first derivatives near these points. Especially, the critical points of V(x) in this paper must be *** main tools are a local Pohozaev type of identity and the blow-up analysis. Our results also show that the asymptotic behavior of concentrated points to Schrödinger-Newton problem is quite different from the classical Schrödinger equations, which is mainly caused by the nonlocal term.

关键词： Schrödinger-Newton equation Non-existence Multi-peak solutions Normalized solutions Pohozaev identity

Metabolic remodeling in chronic heart failure

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第8期14卷 688-695页

作者： Jing WANG tao guo Department of Cardiology the First Affiliated Hospital of Kunming Medical University

Although the management of chronic heart failure (CHF) has made enormous progress over the past decades, CHF is still a tremendous medical and societal burden. Metabolic remodeling might play a crucial role in the pathophysiology of CHF. The characteristics and mechanisms of metabolic remodeling remained unclear, and the main hypothesis might include the changes in the availability of metabolic substrate and the decline of metabolic capability. In the early phases of the disease, metabolism shifts toward carbohydrate utilization from fatty acids (FAs) oxidation. Along with the progress of the disease, the increasing level of the hyperadrenergic state and insulin resistance cause the changes that shift back to a greater FA uptake and oxidation. In addition, a growing body of experimental and clinical evidence suggests that the improvement in the metabolic capability is likely to be more significant than the selection of the substrate.

关键词： Chronic heart failure (CHF) Metabolic remodeling Metabolic substrate Metabolic capability