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Exfoliation Corrosion of As‑Extruded Mg–1Li–1Ca:the Influence of the Superficial Layer

Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1339-1353页

作者： Ze‑Song Wei Zi‑You Ding Lei Cai Shao‑Xia Ma dong‑qing zhao Lan‑Yue Cui Cheng‑Bao Liu Yuan‑Sheng Yang Yuan‑Ding Huang Rong‑Chang Zeng Corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China Engineering Research Center for Magnesium‑Based New Materials Center for Advancing Materials Performance from the Nanoscale(CAMP‑Nano)State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Institute of Metals Research Chinese Academy of SciencesShenyang 110016China Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax‑Planck‑Str.121502 GeesthachtGermany

Exfoliation corrosion(EFC)has rarely been reported for wrought magnesium *** EFC of the as-extruded Mg–1Li–1Ca alloy was observed after the removal of outermost fine-grained *** microstructure and corrosion products were investigated using optical microscopy,scanning electron microscopy,electron backscattered diffraction,X-ray diffraction,and Fourier transform infrared *** corrosion behavior was analyzed using electrochemical polarization,electrochemical impedance spectroscopy,and scanning Kelvin probe *** results indicated that the surface of Mg–1Li–1Ca,with the superficial layer removed,was more susceptible to EFC.A linear correlation between grain boundary density and corrosion resistance was ***,the influence of factors such as grain size,intermetallic compounds,different alloy surfaces,and corrosion products on EFC were discussed,and the corresponding EFC mechanism was clarified.

关键词： Magnesium alloys Exfoliation corrosion Microstructure Intermetallic compound Metamorphic skin

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Super P and MoO2/MoS2 co-doped gradient nanofiber membrane as multi-functional separator for lithium–sulfur batteries

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Rare Metals 2024年第9期43卷 4263-4273页

作者： Xin Liang dong-qing zhao Qian-Qian Huang Sheng Liang Li-Li Wang Lei Hu Ling-Li Liu Kun-Hong Hu Chong-Hai Deng Sheng Cheng Er-Tao Zhu Hua-Xia Deng School of Energy Materials and Chemical Engineering LIB Technology Center of Anhui ProvinceHefei University Instrumental Analysis Centre Hefei University of Technology Hefei Youngy Energy Materials Co. Ltd. Department of Modern Mechanics University of Science and Technology of China

Lithium-sulfur battery is one of the most promising battery systems for industrialization due to its high theoretical specific capacity and high energy ***,the??shuttle effect??has restrained the advancement of lithium-sulfur *** this work,a gradient-structured nanofiber membrane with pure gelatin on one side and Super P-MoO2/MoS2-gelatin on the other side was created using a multi-step electrostatic spinning technique,which was applied for multi-functional separator for lithium-sulfur *** pure gelatin layer facing the anode side primarily homogenizes the lithium flux,whereas the Super P-MoO2/MoS2-gelatin layer facing the cathode side primarily adsorbs polysulfides by physical and chemical adsorption and enhancing polysulfide conversion *** findings demonstrate that even after 150 cycles at 0.2C,the lithium-sulfur battery can still sustain a discharge-specific capacity of 572.3 mAh·*** used with Li||Li symmetric batteries,it has a cycle life of more than 1200 *** commercialization of lithium-sulfur batteries is given a fresh idea by this straightforward preparation technique.

关键词： Li–S battery Membrane MoO2/MoS2 Nanofiber

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Delay-dependent Stability Analysis for Markovian Jump Systems with Interval Time-varying-delays

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International Journal of Automation and computing 2010年第2期7卷 224-229页

作者： Xu-dong zhao qing-Shuang Zeng Space Control and Inertial Technology Center Harbin Institute of Technology Harbin 150001 PRC

This paper proposes improved stochastic stability conditions for Markovian jump systems with interval time-varying delays. In terms of linear matrix inequalities （LMIs）, less conservative delay-range-dependent stability conditions for Markovian jump systems are proposed by constructing a different Lyapunov-Krasovskii function. The resulting criteria have advantages over some previous ones in that they involve fewer matrix variables but have less conservatism. Numerical examples are provided to demonstrate the efficiency and reduced conservatism of the results in this paper.

关键词： Stochastic stability Markovian jump systems linear matrix inequality (LMI).

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H_∞ Output Feedback Control for Stochastic Systems with Mode-dependent Time-varying Delays and Markovian Jump Parameters

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International Journal of Automation and computing 2010年第4期7卷 447-454页

作者： Xu-dong zhao qing-Shuang Zeng Space Control and Inertial Technology Center Harbin Institute of Technology Harbin 150001 PRC

This paper deals with the H∞ control problems of Markovian jump systems with mode-dependent time delays. First, considering the mode-dependent time delays, a different delay-dependent H∞ performance condition for Markovian jump systems is proposed by constructing an improved Lyapunov-Krasovskii function. Based on this new H∞ disturbance attenuation criterion, a full-order dynamic output feedback controller that ensures the exponential mean-square stability and a prescribed H∞ performance level for the resulting closed-loop system is designed. Illustrative numerical examples are provided to demonstrate the effectiveness of the proposed approach.

关键词： H∞ performance Markovian jump systems time-varying delay output feedback control linear matrix inequality (LMI)

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Synthesis and mesomorphic properties of novel tolane-type liquid crystals

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Chinese Chemical Letters 2009年第11期20卷 1283-1286页

作者： dong Yu zhao qing Yong Meng Xiao Peng Cui Huai Yang Department of Materials Physics and Chemistry School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Two series of novel tolane-type liquid crystals （LCs） comprising of hydrogen-bonded organic acids were synthesized. The formation of dimerized H-bond LCs was confirmed by IR spectroscopy, and mesomorphic properties of the LCs were investigated by differential scanning calorimetry （DSC） and polarizing optical microscopy （POM）. It was found that the end groups of the liquid crystals as well as the unsaturated rigid core had effect on the mesomorphic properties.

关键词： Tolane Hydrogen-bonded liquid crystal Mesomorphic properties Synthesis

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Effects of different concentrations of tetramethylpyrazine,an active constituent of Chinese herb, on human corneal epithelial cell damaged by hydrogen peroxide

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International Journal of Ophthalmology(English edition) 2014年第6期7卷 947-951页

作者： Na Li Xin-Guo Deng Shi-Hua Zhang Mei-Feng He dong-qing zhao State Key Laboratory of Ophthalmology Zhongshan Ophthalmic CenterSun Yat-sen University Department of ophthalmology Huizhou First Hospital

AIM: To discuss the effects of different concentrations of tetramethylpyrazine(TMP), an active constituent of Chinese herb, on damaged Shandong human corneal epithelial cell(SDHCEC) induced by hydrogen ***: We detected the combined effects of TMP with concentrations ranging from 4 mg/m L to 0.03 mg/m L and 800 μM hydrogen peroxide on SDHCEC. The methyl thiazolyl tetrazolium(MTT) assay was processed at 3, 6and 12 h separately while the detection of cell apoptosis at 6h only by flow ***: The viability of SDHCEC with 0.5 mg/m L,0.25 mg/m L, 0.125 mg/m L and 0.06 mg/m L TMP joint with800 μM hydrogen peroxide at 3h and 6h was significantly higher than that with 800 μM hydrogen peroxide only, P <0.05. However, except 0.25 mg/m L, TMP with other concentrations joint with 800 μM hydrogen peroxide at12 h could not significantly inhibit decreased SDHCEC viability induced by 800 μM hydrogen peroxide. At 12 h,TMP of 0.5 mg/m L, 0.25 mg/m L, 0.125 mg/m L and 0.06 mg/m L could significantly inhibit SDHCEC early apoptosis induced by 800 μM hydrogen peroxide, most remarkable at 0.25 mg/m L TMP, P <***: Our results suggested that hydrogen peroxide can induce apoptosis related damage to SDHCEC. TMP can protect SDHCEC from the damage,and the protective effects may be associated with its anti-apoptosis mechanism.

关键词： human corneal epithelial cell cell viability apoptosis hydrogen peroxide

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How to interpret low human chorionic gonadotropin levels in cerebrospinal fluid of patients with intracranial germinoma？

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Chinese Medical Journal 2013年第24期126卷 4809-4810页

作者： CONG Lu TIAN Cheng-lin WANG Xiang-qing dong zhao ZHANG Jia-tang YU Sheng-yuan Department of Neurology Chinese People's Liberation Anny General Hospital Beijing 100853 China

Human chorionic gonadotropin （hCG） level in cerebrospinal fluid （CSF hCG） is very useful for thediagnosis of intracranial germinoma. We have previously reported on two patients with germinoma located in the basal ganglia. Their CSF hCG levels were extremely low upon presentation.1 However, significantly increased CSF hCG levels were detected when these two patients had a relapse. The experience acquired in these two cases is helpful to appropriately interpret the CSF hCG levels that are used to detect intracranial germinoma, evaluate the effectiveness of treatment and monitor recurrence.

关键词： germinoma, human chorionic gonadotropin cerebrospinal fluid

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Characteristics of AZ31 Mg alloy joint using automatic TIG welding

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International Journal of Minerals,Metallurgy and Materials 2017年第1期24卷 102-108页

作者： Hong-tao Liu Ji-xue Zhou dong-qing zhao Yun-teng Liu Jian-hua Wu Yuan-sheng Yang Bai-chang Ma Hai-hua Zhuang Shandong Key Laboratory for High Strength Lightweight Metallic Materials Advanced Materials InstituteShandong Academy of SciencesJinan 250014China Shandong Engineering Research Center for Lightweight Automobiles Magnesium Alloys Advanced Materials InstituteShandong Academy of SciencesJinan 250014China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The automatic tungsten-inert gas welding（ATIGW） of AZ31 Mg alloys was performed using a six-axis robot. The evolution of the microstructure and texture of the AZ31 auto-welded joints was studied by optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and electron backscatter diffraction. The ATIGW process resulted in coarse recrystallized grains in the heat affected zone（HAZ） and epitaxial growth of columnar grains in the fusion zone（FZ）. Substantial changes of texture between the base material（BM） and the FZ were detected. The {0002} basal plane in the BM was largely parallel to the sheet rolling plane, whereas the c-axis of the crystal lattice in the FZ inclined approximately 25° with respect to the welding direction. The maximum pole density increased from 9.45 in the BM to 12.9 in the FZ. The microhardness distribution, tensile properties, and fracture features of the AZ31 auto-welded joints were also investigated.

关键词： magnesium alloys TIG welding microstructure texture microhardness

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Resilient control of flexible hypersonic vehicles against unmatched distributed faults

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Chinese Journal of Aeronautics 2024年第5期37卷 60-70页

作者： dong zhao Wenjing REN School of Artificial Intelligence Anhui UniversityHefei 230601China Key Laboratory of System Control and Information Processing Ministry of EducationShanghai Jiao Tong UniversityShanghai 200240China School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China

This paper studies a robust fault compensation and vibration suppression problem of flexible hypersonic *** controlled plant is represented by a cascade system composed of a nonlinear Ordinary Differential Equation(ODE)and an Euler-Bernoulli Beam Equation(EBBE),in which the vibration dynamics is coupled with the rigid dynamics and suffers from distributed faults.A state differential transformation is introduced to transfer distributed faults to an EBBE boundary and a longitudinal dynamics is refined by utilizing T-S fuzzy IF-THEN rules.A novel T-S fuzzy based fault-tolerant control algorithm is developed and related stability conditions are *** robust exponential stability and well-posedness are proved by using the modified l_(0)-semigroup based Lyapunov direct approach.A simulation study on the longitudinal dynamics of flexible hypersonic vehicles effectively verifies the validity of the developed theoretical results.

关键词： Flexible hypersonic vehicles ODE-EBBE cascade Robust exponential stability Unmatched distributed fault compensation Vibration suppression

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Sorafenib inhibits ossification of the posterior longitudinal ligament by blocking LOXL2-mediated vascularization

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Bone Research 2024年第2期12卷 372-389页

作者： Longqing Wang Wenhao Jiang Siyuan zhao dong Xie qing Chen Qi zhao Hao Wu Jian Luo Lili Yang Spine Center Department of OrthopaedicsShanghai Changzheng HospitalSecond Affiliated Hospital of Naval Medical UniversityShanghai 200003PR China Yangzhi Rehabilitation Hospital(Shanghai Sunshine Rehabilitation Center) Tongji University School of MedicineShanghaiPR China Shanghai Key Laboratory of Regulatory Biology Institute of Biomedical Sciences and School of Life SciencesEast China Normal UniversityShanghaiPR China Department of Orthopaedics No.905 Hospital of PLA NavyShanghaiPR China

Ossification of the Posterior Longitudinal Ligament(OPLL)is a degenerative hyperostosis disease characterized by the transformation of the soft and elastic vertebral ligament into bone,resulting in limited spinal mobility and nerve *** both bulk and single-cell RNA sequencing,we elucidate the molecular characteristics,cellular components,and their evolution during the OPLL process at a single-cell resolution,and validate these findings in clinical *** study also uncovers the capability of ligament stem cells to exhibit endothelial cell-like phenotypes in vitro and in ***,our study identifies LOXL2 as a key regulator in this *** gain-and loss-of-function studies,we elucidate the role of LOXL2 in the endothelial-like differentiation of ligament *** acts via the HIF1A pathway,promoting the secretion of downstream VEGFA and *** function is not related to the enzymatic activity of ***,we identify sorafenib,a broad-spectrum tyrosine kinase inhibitor,as an effective suppressor of LOXL2-mediated vascular *** disrupting the coupling between vascularization and osteogenesis,sorafenib demonstrates significant inhibition of OPLL progression in both BMP-induced and enpp1 deficiency-induced animal models while having no discernible effect on normal bone *** findings underscore the potential of sorafenib as a therapeutic intervention for OPLL.

关键词： LOXL2 ligament finding

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