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Microstructures and mechanical properties of low carbon fishplate materials

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Acta Metallurgica Sinica(English Letters) 2010年第3期23卷 176-184页

作者： Fumin XU Kai wen Yi tan School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China

Two kinds of low carbon bainite materials were developed for fishplate *** microstructures and mechanical properties were measured in *** results showed that one material was composed of fine granular bainite with the yield strength of 722 MPa at room temperature and 738 MPa at-55℃, and elongation percentages of 60.7% and 41.7%, *** other one had a meta-bainite microstructure with corresponding strengths of 568.5 MPa and 700 MPa, elongation percentages of 63.5% and 67.1%, *** values are all superior to the home-made B7 steel and the fishplate materials made in *** major strengthening mechanisms were discussed and attributed to the solid solution, complex phases, fine grain and dislocation strengthening.

关键词： Fishplate Microstructure Mechanical property Strengthening

Risk stratification of primary liver cancer

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World Journal of Clinical Cases 2022年第26期10卷 9545-9549页

作者： You-wen tan Department of Hepatology The Third Hospital of Zhenjiang Affiliated Jiangsu UniversityZhenjiang 212000Jiangsu ProvinceChina

The risk stratification of primary liver cancer(PLC)discussed in a review of viral hepatitis and PLC could lead to misunderstandings by *** example,a single study or a small number of studies cannot comprehensively summarize the risk factors of PLC,is not included in the family history of liver cancer,and chronic hepatitis D is listed as a medium risk factor for the development of ***,PLC prediction models with good clinical validation values have been applied clinically,such as the Toronto hepatocellular carcinoma risk index,REACH-B model,and PAGE-B ***,the Chinese,together with several research societies,have formulated the“Guideline for stratified screening and surveillance of primary liver cancer(2020 edition).”This guideline outlines PLC screening in at-risk populations,both in hospitals and *** is recommended to stratify the at-risk population into four risk levels:low-,intermediate-,high-,and extremely *** is highly recommended and applied in clinical practice.

关键词： Risk factors Model Primary liver cancer Hepatocellular carcinoma

Design of PID controller with incomplete derivation based on differential evolution algorithm

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Journal of Systems Engineering and Electronics 2008年第3期19卷 578-583页

作者： Wu Lianghong Wang Yaonan Zhou Shaowu tan wen School of Information and Electric Engineering Hunan Univ. of Science and Technology Xiangtan 411201 P. R. China Coll. of Electric and Information Engineering Hunan Univ. Changsha 410082 P. R. China

To determine the optimal or near optimal parameters of PID controller with incomplete derivation, a novel design method based on differential evolution （DE） algorithm is presented. The controller is called DE-PID controller. To overcome the disadvantages of the integral performance criteria in the frequency domain such as IAE, ISE, and ITSE, a new performance criterion in the time domain is proposed. The optimization procedures employing the DE algorithm to search the optimal or near optimal PID controller parameters of a control system are demonstrated in detail. Three typical control systems are chosen to test and evaluate the adaptation and robustness of the proposed DE-PID controller. The simulation results show that the proposed approach has superior features of easy implementation, stable convergence characteristic, and good computational efficiency. Compared with the ZN, GA, and ASA, the proposed design method is indeed more efficient and robust in improving the step response of a control system.

关键词： PID controller incomplete derivation differential evolution parameter tuning.

Augmented Virtual Stiffness Rendering of a Cable-driven SEA for Human-Robot Interaction

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IEEE/CAA Journal of Automatica Sinica 2017年第4期4卷 714-723页

作者： Ningbo Yu Wulin Zou wen tan Zhuo Yang IEEE Institute of Robotics and Automatic Information Systems Nankai University Tianjin Key Laboratory of Intelligent Robotics Nankai University Haihe Education Park

Human-robot interaction(HRI) is fundamental for human-centered robotics, and has been attracting intensive research for more than a decade. The series elastic actuator(SEA) provides inherent compliance, safety and further benefits for HRI, but the introduced elastic element also brings control difficulties. In this paper, we address the stiffness rendering problem for a cable-driven SEA system, to achieve either low stiffness for good transparency or high stiffness bigger than the physical spring constant, and to assess the rendering accuracy with quantified metrics. By taking a velocity-sourced model of the motor, a cascaded velocity-torque-impedance control structure is established. To achieve high fidelity torque control, the 2-DOF(degree of freedom) stabilizing control method together with a compensator has been used to handle the competing requirements on tracking performance, noise and disturbance rejection,and energy optimization in the cable-driven SEA system. The conventional passivity requirement for HRI usually leads to a conservative design of the impedance controller, and the rendered stiffness cannot go higher than the physical spring constant. By adding a phase-lead compensator into the impedance controller,the stiffness rendering capability was augmented with guaranteed relaxed passivity. Extensive simulations and experiments have been performed, and the virtual stiffness has been rendered in the extended range of 0.1 to 2.0 times of the physical spring constant with guaranteed relaxed passivity for physical humanrobot interaction below 5 Hz. Quantified metrics also verified good rendering accuracy.

关键词： Cable actuation impedance control physical human-robot interaction relaxed passivity series elastic actuator stabilizing 2-DOF(degree of freedom) controllers

Experiments in Consensus-based Decentralized Information Feedback Control Strategies on a Real Robotic Fish Platform

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Journal of Harbin Institute of Technology(New Series) 2013年第5期20卷 62-68页

作者： Hong-Fei Han wen tan School of Control & Computer North China Electric Power University

A decentralized information feedback mechanism was introduced to a group of mobile robots such that the robots asymptotically converge to a given moving formation. While various distributed cooperative control strategies have been studied in theory,few of them have been systematically validated on experimental platforms. This paper demonstrates the experimental results of consensus-based decentralized information feedback mechanism on a multiple mobile robotic fish platform. In this paper, we firstly introduced a fundamental consensus algorithm for systems model and the cooperative control experimental platform,and then experimentally implemented and validated the formation control algorithm through setting transit point and lookup table method and so on. The experimental results show the effectiveness of the consensus-based decentralized information feedback control strategies.

关键词： decentralized feedback formation control communication graph muhi-robot systems

Early diagnostic value of liver stiffness measurement in hepatic sinusoidal obstruction syndrome induced by hematopoietic stem cell transplantation

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World Journal of Clinical Cases 2022年第26期10卷 9241-9253页

作者： You-wen tan Yi-Chun Shi Department of Hepatology The Third Hospital of Zhenjiang Affiliated Jiangsu UniversityZhenjiang 212003Jiangsu ProvinceChina

Hematopoietic stem cell transplantation(HSCT)-sinusoidal obstruction syndrome(SOS),also known as veno-occlusive disease,is a clinical syndrome characterized by symptoms,such as right upper quadrant pain,jaundice,fluid retention,and hepatomegaly,and is caused by pre-treatment-related hepatotoxicity during the early stages after *** diagnosis of HSCT-SOS is based on the revised Seattle or Baltimore *** revised standard by the European Society for Bone Marrow Transplantation in 2016 has good practicability and can be used in combination with these two *** studies have shown the value of liver stiffness measurement(LSM)in the early diagnosis of *** studies investigated LSM specificity and sensitivity for the early diagnosis of *** can distinguish SOS from other post-HSCT complications,enabling a clear differential *** has been shown that median LSM of patients with SOS is significantly higher than that of patients with other treatment-related liver complications(e.g.,acute cholecystitis,cholangitis,antifungal drug-related liver injury,liver graft-versus-host disease,isolated liver biochemical changes,and fulminant Epstein Barr virus related hepatitis reactivation).Therefore,the above data confirmed the utility of LSM and strongly suggested that LSM improves the positive predictive value of the SOS diagnostic clinical score after allogeneic *** diagnosis of SOS is beneficial in preventing severe HSCT complications.

关键词： Hematopoietic stem cell transplantation Sinusoidal obstruction syndrome Liver stiffness measurement Stem cell

Phage display creates innovative applications to combat hepatitis B virus

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World Journal of Gastroenterology 2014年第33期20卷 11650-11670页

作者： wen Siang tan Kok Lian Ho Department of Microbiology Faculty of Biotechnology and Biomolecular Sciences Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia Department of Pathology Faculty of Medicine and Health Sciences Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia

Hepatitis B virus (HBV) has killed countless lives in human history. The invention of HBV vaccines in the 20th century has reduced significantly the rate of the viral infection. However, currently there is no effective treatment for chronic HBV carriers. Newly emerging vaccine escape mutants and drug resistant strains have complicated the viral eradication program. The entire world is now facing a new threat of HBV and human immunodeficiency virus co-infection. Could phage display provide solutions to these life-threatening problems? This article reviews critically and comprehensively the innovative and potential applications of phage display in the development of vaccines, therapeutic agents, diagnostic reagents, as well as gene and drug delivery systems to combat HBV. The application of phage display in epitope mapping of HBV antigens is also discussed in detail. Although this review mainly focuses on HBV, the innovative applications of phage display could also be extended to other infectious diseases.

关键词： Phage display Hepatitis B virus Epitope mapping Drug delivery Gene delivery Antiviral drug Therapeutics Diagnosis Hepatocellular carcinoma Virus-like particle Vaccine

Solidification and heat transfer of molten steel slag particles during air quenching process

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Journal of Iron and Steel Research International 2023年第9期30卷 1834-1842页

作者： wen-feng Gu Jiang Diao Rui-xin Hu wen-sun Ge wen-feng tan Hong-yi Li Bing Xie College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium–Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China Institute of Materials Engineering Technology Pangang Group Research Institute Co.Ltd.Panzhihua 617000SichuanChina

In order to effectively utilize the resources and energy of molten steel slag,the variation of precipitation phase and specific heat of air quenched steel slag(AQSS)particles during continuous cooling process was investigated by FactSage and thermogravimetry differential scanning *** cooling and solidification process of molten AQSS particles was simulated by *** microstructure changes in AQSS particles in solidification process were analyzed using an ultrahigh temperature laser confocal microscope and a scanning electron *** results indicated that in the cooling process of molten AQSS particles,the precipitation of Ca_(2)Fe_(2)O_(5) resulted in the largest change of specific *** the condition of slow cooling,the cooling rate is more obviously affected by specific *** the initial air velocity was 300 m s^(-1),there was the highest temperature difference in AQSS particles during cooling *** is more,the compactness of the boundary region of AQSS particles was obviously better than that of its central region.

关键词： Specific heat Air quenched steel slag Cooling Solidification Microstructure change

Proper orthogonal decomposition based seismic source wavefield reconstruction for finite element reverse time migration

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Petroleum Science 2023年第1期20卷 199-211页

作者： wen-Zhuo tan Bang-Yu Wu Rui Li Bo Li School of Mathematics and Statistics Xi'an Jiaotong UniversityXi'anShaanxi710049China School of Mathematics and Statistics Shaanxi Normal UniversityXi'anShaanxi710062China SNOPEC Key Laboratory of Geophysics NanjingJiangsu211103China

The large storage requirement is a critical issue in cross-correlation imaging-condition based reverse time migration(RTM),because it requires the operation of the source and receiver wavefields at the same *** boundary value method(BVM),based on the finite difference method(FDM),can be used to reconstruct the source wavefield in the reverse time propagation in the same way as the receiver wavefield,which can reduce the storage burden of the RTM *** that the FDM cannot well handle models with discontinuous material properties and rough interfaces,we develop a source wavefield reconstruction strategy based on the finite element method(FEM),using proper orthogonal decomposition(POD)to enhance computational *** this method,we divide the whole time period into several segments,and construct the POD basis functions to get a reduced order model(ROM)for the source wavefield reconstruction in each *** show the corresponding quantitative analysis of the storage requirement of the *** tests on the homogeneous model show the effectiveness of the proposed method,while the layered model and part of the Marmousi model tests indicate that the POD-FEM can keep an excellent balance between computational efficiency and memory usage compared with the full-stored method(FSM)and the BVM,and can be effectively applied in imaging.

关键词： Reverse time migration Seismic wavefield reconstruction Finite element modeling Proper orthogonal decomposition