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Acta Metallurgica Sinica(English Letters) 2018年第11期31卷 1207-1214页

作者： Sheng-Hui xie Guang-Qiang Peng Xian-Meng Tu Hai-Xia Qian xie-rong Zeng Shenzhen Key Laboratory of Special Functional Materials and Shenzhen Engineering Laboratory for Advance Technology of Ceramics College of Materials Science and Engineering Shenzhen University Shenzhen 518060 China

In this study, the degradation efficiencies of zero-valent iron （ZVI） powders with different structures and components wereevaluated for methyl orange （MO）. The results show that the structure is an essential factor that affects degradation, andadded non-metallic elements help optimize the structure. The amorphous and balled-milled crystalline Fe7oSiloB2o hascomparative degradation efficiencies to MO with tl/2 values of 6.9 and 7.0 min, respectively. Increasing the boron contentcan create a favorable structure and promote degradation. The ball-milled crystalline Fe70B30 and Fe43.64B56.36 powdershave relatively short tl/2 values of 5.2 and 3.3 rain, respectively. The excellent properties are mainly attributed to theirheterogeneous structure with boron-doped active sites in ZVI. Composition segregation in the nanoscale range in anamorphous FeSiB alloy and small boron particles in the microscale range embedded in large iron particles prepared by ball-milling, both constitute effective galvanic cells that promote iron electron loss and therefore decompose organic *** findings may provide a new, highly efficient, low-cost commercial method for azo dye wastewater treatment usingZVI.

关键词： Fe-based powder Fe-based metallic glass Degradation Methyl orange Galvanic cell

Robustness Analysis of Discrete-time Indirect Model Reference Adaptive Control with Normalized Adaptive Laws

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International Journal of Automation and computing 2010年第3期7卷 381-388页

作者： Qing-Zheng Gao xue-Jun xie Department of Physics and Information Engineering Jining University Qufu 273155 PRC School of Electrical Engineering and Automation Xuzhou Normal University Xuzhou 221116 PRC

For a class of discrete-time systems with unmodeled dynamics and bounded disturbance, the design and analysis of robust indirect model reference adaptive control （MRAC） with normalized adaptive law are investigated. The main work includes three parts. Firstly, it is shown that the constructed parameter estimation algorithm not only possesses the same properties as those of traditional estimation algorithms, but also avoids the possibility of division by zero. Secondly, by establishing a relationship between the plant parameter estimate and the controller parameter estimate, some similar properties of the latter are also established. Thirdly, by using the relationship between the normalizing signal and all the signals of the closed-loop system, and some important mathematical tools on discrete-time systems, as in the continuous-time case, a systematic stability and robustness analysis approach to the discrete indirect robust MRAC scheme is developed rigorously.

关键词： Discrete-time systems model reference adaptive control (MRAC) swapping lemmas stability robustness

Effect of Martian atmosphere on aerodynamic performance of supersonic parachute two-body systems

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Chinese Journal of Aeronautics 2022年第4期35卷 45-54页

作者： Xiaopeng xue He JIA Wei rong Qi WANG Chih-yung WEN School of Aeronautics and Astronautics Central South UniversityChangsha 410083China Beijing Institute of Space Mechanics and Electricity Beijing 100094China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Supersonic flows around parachute two-body systems are numerically investigated by solving the compressible Navier-Stokes equations. In the present study, both rigid and flexible parachute models are considered, which comprise a capsule and a canopy. The objective of the present study is to investigate the effects of the Martian atmosphere on the unsteady flows produced by these parachute two-body models and the structural behavior of the flexible canopy. It was found that in the Martian atmosphere, the supersonic rigid parachutes with shorter trailing distances exhibited weaker aerodynamic interactions between the capsule wake and canopy shock, resulting in a smaller pressure distribution on the typical surfaces of the canopy. By contrast, because the flow modes around the flexible parachute in the Martian atmosphere were similar to those of the rigid parachute under the air conditions of the wind tunnel tests, the canopy shape was almost unchanged. When a new canopy material was designed by decreasing the Young’s modulus and damping coefficient, an area oscillation phenomenon was observed in the flexible parachute with a trailing distance of 10 in the Martian atmosphere. Consequently, the Martian atmosphere(low density and pressure) has a significant effect on the aerodynamic performance of the flexible parachute system.

关键词： Canopy flexibility Fluid structure interaction Martian atmosphere Supersonic parachute Unsteady flow

A novel variable structure multi-model approach based on error-ambiguity decomposition

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Chinese Journal of Aeronautics 2020年第6期33卷 1731-1746页

作者： Han SHEN-TU Yingjiao rong Dongliang PENG Mengfan xue Yunfei GUO Institution of Information and Control Hangzhou Dianzi UniversityHangzhou 310018China Science and Technology on Near-Surface Detection Laboratory Wuxi 214035China

Model Set Adaptation(MSA)plays a key role in the Variable Structure Multi-Model tracking approach(VSMM).In this paper,the Error-Ambiguity Decomposition(EAD)principle is adopted to derive the EAD-MSA criterion that is optimal in the sense of minimizing the square error between the estimate and the ***,the EAD Variable Structure first-order General Pseudo Bayesian(EAD-VSGPB1)algorithm and the EAD Variable Structure Interacting Multiple Model(EAD-VSIMM)algorithm are *** proposed algorithms are tested in two groups of maneuvering target tracking scenarios under different modes and observation error *** simulation results demonstrate the effectiveness of the EAD-VSMM approach and show that,compared to some existing multi-model algorithms,the proposed EAD-VSMM algorithms achieve more robust and accurate tracking results.

关键词： Error-ambiguity decomposition Maneuvering target tracking Model sequence set adaptation Multi-model estimation Variable structure

Clonal replacement of novel T cells: a new phenomenon in the tumor microenvironment following PD-1 blockade

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Signal Transduction and Targeted Therapy 2019年第1期4卷 243-244页

作者： xue Li Manni Wang rong Xiang Department of Biotherapy State Key Laboratory of Biotherapy and Cancer CenterWest China HospitalSichuan UniversityNo.17Block 3Southern Renmin Road610041 ChengduSichuanChina Department of Immunology School of MedicineNankai UniversityTianjinChina

In a recent study published in Nature Medicine,Yost et al.1 described the clonal replacement of tumor-specific T cells after treatment with PD-1 *** finding reveals the intrinsic ability of the tumor microenvironment to attract new T cells,which has crucial applications for the design of immune checkpoint blockade(ICB)therapies(Fig.1).Over the past few decades,ICB therapies have been successful in some patients with different types of cancer by blocking inhibitory checkpoint receptors on T cells,and thus restoring T cell-mediated immune responses as well as recruiting more T cells into the tumor environment.

关键词： al. tumor Medicine

Creep-Resistant Covalent Adaptable Networks with Excellent SelfHealing and Reprocessing Performance via Phase-Locked Dynamic Covalent Benzopyrazole-Urea Bonds

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Chinese Journal of Polymer Science 2024年第10期42卷 1545-1556,I0013页

作者： Miao xie Xiao-rong Wang Zhan-Hua Wang He-Sheng Xia State Key Laboratory of Polymer Materials Engineering Polymer Research InstituteSichuan UniversityChengdu610065China School of Petrochemical Engineering Liaoning Petrochemical UniversityFushun113001China

Covalent adaptive networks(CANs)are capable of undergoing segment rearrangement after being heated,which endows the materials with excellent self-healing and reprocessing performance,providing an efficient solution to the environment pollution caused by the plastic *** main challenge remains in developing CANs with both excellent reprocessing performance and creep-resistance *** this study,a series of CANs containing dynamic covalent benzopyrazole-urea bonds were developed based on the addition reaction between benzopyrazole and isocyanate *** calculation confirmed that relatively low dissociation energy is obtained through undergoing a five-member ring transition state,confirming excellent dynamic property of the benzopyrazole-urea *** verified by the FTIR results,this nice dynamic property can be well maintained after incorporating the benzopyrazole-urea bonds into polymer *** self-healing and reprocessing performance is observed by the 3-ABP/PDMS elastomers owing to the dynamic benzopyrazole-urea *** separation induced by the aggregation of the hard segments locked the benzopyrazole-urea bonds,which also makes the elastomers display excellent creep-resistance *** hard phase locking strategy provides an efficient approach to design CANs materials with both excellent reprocessing and creep-resistance performance.

关键词： Covalent adaptive networks Self-healing polymer Dynamic covalent bond

Neuroprotective effects of flavonoids extracted from licorice on kainate-induced seizure in mice through their antioxidant properties

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第11期14卷 1004-1012页

作者： Ling-hui ZENG Hua-dan ZHANG Cai-ju XU Yu-jia BIAN xue-jiao XU Qiang-min xie rong-hua ZHANG Department of Pharmacy Zhejiang University City College Zhejiang Provincial Center for Disease Control and Prevention Department of Pharmacology School of MedicineZhejiang University

A relationship between status epilepticus(SE)and oxidative stress has recently begun to be *** explore whether the flavonoids extracted from licorice(LFs)have any protective effect on kainate(KA)-induced seizure in mice,we treated mice with LFs before and after KA *** KA-treated mice,we found that superoxide dismutase(SOD)activity decreased immediately after the onset of seizure at 1 h and then increased at 6 *** returned to baseline 1 d after seizure and then increased again at 3,7,and 28 d,while malondialdehyde(MDA)content remained at a high level at 1 h,6 h,3 d,7 d,and 28 d,indicating a more oxidized status related to the presence of more reactive oxygen species(ROS).Treatment with LFs before KA injection reversed the seizure-induced change in SOD activity and MDA content at 1 h,6 h,3 d,7 d,and 28 *** with LFs after seizure decreased KA-induced SOD activity and MDA content at 7 and 28 ***,LF pre-and post-KA treatments decreased seizure-induced neuronal cell ***,Morris water maze tests revealed that the escape latency was significantly decreased and the number of target quadrant crossings was markedly increased in the LF-treated ***,our data indicate that LFs have protective effects on seizure-induced neuronal cell death and cognitive impairment through their anti-oxidative effects.

关键词： Seizure Kainate Flavonoid Licorice Antioxidant Malondialdehyde(MDA) Superoxide dismutase(SOD

Numerical Simulation of Motor Vehicles’ Courtesy Behavior on Crosswalk Based on Car-Following Model

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Journal of Beijing Institute of Technology 2019年第3期28卷 570-576页

作者： Baojie Wang Xiangbei xue Xiaoli xie School of Highway Chang’an University

In observing driver courtesy towards pedestrians at unsignalized crosswalks, a behavioral model was adopted in a simulation based on the GM Car-Following Model. The SIMI Motion Software was used to extract the vehicle operation data from Wenyi South Road and Hanyuan Road in Xi'an City. The parameters of the GM Car-Following Model were calibrated by genetic algorithm. The road simulation environment based on the Car-Following Model was constructed by MATLAB. In the case of no stopping, uniform deceleration avoidance with advance notice, emergency brake avoidance without advance notice, changes such as the displacement of the Car-Following queue, headway, speed, acceleration, and deceleration were analyzed by numerical simulation. The results show that when there is advance notice before the crosswalk, the minimum headway distances of Car1-Car2, Car2-Car3, Car3-Car4 and Car4-Car5 are 7.09 m, 7.38 m, 7.65 m, 7.91 m, and the average rates of change of the headway during deceleration are 0.78 m/s, 0.74 m/s, 0.71 m/s, 0.68 m/s respectively;in the absence of advance notice before the crosswalk, the minimum headway distances of Car1-Car2, Car2-Car3, Car3-Car4 and Car4-Car5 are 7.28 m, 7.75 m, 8.19 m, 8.59 m, and the average rates of change of the headway during deceleration are 1.57 m/s, 1.25 m/s, 1.04 m/s, 0.96 m/s, respectively. Therefore, in order to effectively prevent the occurrence of vehicle rear-end events, it's necessary to set traffic signs and markings on the preceding section of the intersection or road exhibiting behavioral comity.

关键词： Car-Following Model crosswalk numerical simulation behavioral comity

Mining a coal seam below a heating goaf with a force auxiliary ventilation system at Longhua underground coal mine, China

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International Journal of Mining Science and Technology 2015年第1期25卷 67-72页

作者： Wang Gang xie Jun xue Sheng Wang Haiyang State Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science & Technology CSIRO Earth Science and Resource Engineering School of Mining Engineering Taiyuan University of Technology

Extraction of a coal seam which lies not far below a heating goafcan be a major safety challenge. A force auxiliary ventilation system was adopted as a control method in successful extraction and recovery of the panel 30110 of the #3-1 coal seam, which is about 30-40 rn below the heating goaf of the #2-2 seam at Longhua underground coal mine, Shanxi Province, China. Booster fans and ventilation control devices such as doors and regulators were used in the system. The results show that, provided that a force auxiliary ventilation system is properly designed to achieve a pressure balance between a panel and its overlying goat＇, the system can be used to extract a coal seam overlain by a heating goal. This paper describes the design, installation and performance of the ventilation system during the extraction and recovery phases of the oanel 30110.

关键词： Force auxiliary ventilation systemMining under a heating goafMultiple seams of close spacingPressure balance

NUMERICAL SIMULATION OF STRESS-INDUCED SECONDARY FLOWS WITH HYBRID FINITE ANALYTIC METHOD

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Journal of Hydrodynamics 2002年第4期14卷 24-30页

作者： Li, Wei Chen, Wen-xue xie, Sheng-Zong Coll. of Water Conservancy Eng. Wuhan Univ. Wuhan 430072 China China Inst. of Water Resources Beijing 100038 China

The algorithm of the Hybrid Finite Analytic Method (HFAM) was used to simulate the fully developed turbulent flows in non-circular ducts and open channels. The turbulent flow fields in a square duct and a rectangular open channels were calculated by the Naot and Rodi's model, and that in a compound channel was calculated by Speaizle's non-linear eddy-viscosity model with this algorithm. The results show that the HFAM is suitable for calculating these complicated turbulent flows.

关键词： Algorithms Computational fluid dynamics Computer simulation Finite element method