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A dural substitute based on oxidized quaternized guar gum/porcine peritoneal acellular matrix with improved stability, antibacterial and anti-adhesive properties

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Chinese Chemical Letters 2023年第3期34卷 424-429页

作者： Xiaoshuang Yu pengfei yue Xu Peng Hongmei Ding Ningning Lei Xixun Yu College of Polymer Science and Engineering Sichuan UniversityChengdu 610065China West China Hospital of Sichuan University Department of BiotherapyCancer CenterState Key Laboratory of BiotherapyChengdu 610041China Experimental and Research Animal Institute Sichuan UniversityChengdu 610065China

Trauma and neurosurgery often result in dural defects and are followed by serious complications or even death, finding suitable dural replacement materials to repair the defective dura has important clinical significance. Porcine peritoneal acellular matrix(PPAM) is a promising alternative material, but its poor stability makes it difficult to meet the various needs of dural reconstruction. In this work, we developed a novel antibacterial cross-linking agent oxidized quaternized guar gum(OQGG) and used it for the first time to stabilize PPAM to construct a dural mater substitute(OQGG-PPAM). The results showed that 1.5%OQGG-PPAM presented suitable mechanical property as well as good thermal stability and resistance to enzymatic degradation. It also exhibited good antibacterial activity and good anti-leakage ability. Furthermore, 1.5% OQGG-PPAM not only exhibited excellent cell compatibility but also significantly stimulated the secretion of b FGF and VEGF from seeded cells which was convenient for dural remodeling. In vivo experiment, it also exhibited the excellent histocompatibility and good anti-adhesion property. This study showed that OQGG can be used as a novel antibacterial cross-linking reagent for crosslinking natural tissues and 1.5% OQGG-PPAM was a potential candidate material for dura mater substitute.

关键词： Oxidized quaternized guar gum Dural substitute Porcine peritoneal acellular matrix Antibacterial

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Freestanding MXene-based macroforms for electrochemical energy storage applications

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SusMat 2023年第4期3卷 471-497页

作者： Qiongqiong Lu Congcong Liu Yirong Zhao Wengao Pan Kun Xie pengfei yue Guoshang Zhang Ahmad Omar Lixiang Liu Minghao Yu Daria Mikhailova Institute of Materials Henan Key Laboratory of Advanced Conductor MaterialsHenan Academy of SciencesZhengzhouHenanChina Leibniz Institute for Solid State and Materials Research(IFW)Dresden e.V. DresdenGermany School of Physical Science and Technology Lanzhou UniversityLanzhouChina School of Engineering Westlake UniversityHangzhouZhejiangChina Faculty of Chemistry and Food Chemistry&Center for Advancing Electronics Dresden Technische Universität DresdenDresdenGermany

Freestanding MXene-based macroforms have gained significant attention as versatile components in electrochemical energy storage applications owing to their interconnected conductive network,strong mechanical strength,and customizable surface chemistries derived from MXene *** comprehensive review article encompasses key aspects related to the synthesis of MXene nanosheets,strategies for structure design and surface medication,surface modification,and the diverse fabrication methods employed to create freestanding MXene-based macroform *** review also delves into the recent advancements in utilizing freestanding MXene macroforms for electrochemical energy storage applications,offering a detailed discussion on the significant progress achieved thus ***,the correlation between the macroform’s structural attributes and its performance characteristics is thoroughly explored,shedding light on the critical factors influencing efficiency and *** the remarkable development,the review also highlights the existing challenges and presents future perspectives for freestanding MXenebased macroforms in the realms of high-performance energy storage *** addressing these challenges and leveraging emerging opportunities,the potential of freestanding MXene-based macroforms can be harnessed to enable groundbreaking advancements in the field of energy storage.

关键词： batteries electrochemical energy storage freestanding macroforms MXenes supercapacitors

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A review on tungsten-trioxide-based photoanodes for water oxidation

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Chinese Journal of Catalysis 2019年第10期40卷 1408-1420页

作者： Jingwei Huang pengfei yue Lei Wang Houde She Qizhao Wang College of Chemistry and Chemical Engineering Research Center of Gansu Military and Civilian Integration Advanced Structural MaterialsGansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional MaterialsNorthwest Normal UniversityLanzhou 730070GansuChina Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006GuangdongChina Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025HeilongjiangChina School of Environmental Science and Engineering Chang’an UniversityXi'an 710064ShaanxiChina

Photoelectrochemical(PEC)water splitting capable of reducing and oxidizing water into hydrogen and oxygen in a generation mode of spatial separation has gained extensive *** order to effectively produce hydrogen at the photocathode of a PEC cell,the photoanode,where the oxygen evolution reaction occurs,should be systematically developed on *** particular,WO3 has been identified as one of the most promising photoanode materials owing to its narrow band gap and high valence band *** practical implementation,however,is still limited by excessive electron–hole recombination and poor water oxidation *** review presents the various strategies that have been studied for enhancing the PEC water oxidation performance of WO3,such as controlling the morphology,introducing defects,constructing a heterojunction,loading a cocatalyst,and exploiting the plasmonic *** addition,the possible future research directions are presented.

关键词： WO3 photoanode Water splitting Defect Heterojunction Cocatalyst

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Optimization Analysis of Sliding Electrical Contact Interface Based on Electromechanical Coupling

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Journal of Applied Mathematics and Physics 2024年第11期12卷 4030-4041页

作者： pengfei yue Jiahe Ma Ronghao Shi Kexing Song Henan Key Laboratory of Advanced Conductor Materials Institute of Materials Henan Academy of Sciences Zhengzhou China

This work addresses the critical issue of current density distribution in the sliding electrical contact interface based on electromechanical coupling, which is essential for minimizing damage and enhancing performance. Using electromechanical coupling analysis and finite element analysis (FEA), the effects of initial contact pressure, pulse current input, and armature speed on current density are examined. Key findings indicate that optimizing the convex rail and armature structures significantly reduces peak current density, improving uniformity and reducing damage. These optimizations enhance the efficiency, accuracy, and service life of sliding electrical contact interfaces, providing a theoretical foundation for designing more durable and efficient high-current-density applications.

关键词： Sliding Contact Interface Electromagnetic Propulsion Current Density Distribution Finite Element Analysis

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Flexible unimodal strain sensors for human motion detection and differentiation

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npj Flexible Electronics 2022年第1期6卷 708-717页

作者： Lu Jin Zhenhong Li Zekun Liu Bethany Richardson Yan Zheng Lulu Xu Zhongda Chen Heng Zhai Hongdoo Kim Qingwen Song pengfei yue Sheng Quan Xie Kap Jin Kim Yi Li Department of Materials School of Natural SciencesThe University of ManchesterManchesterUK College of Textile Science and Engineering Xi’an Polytechnic UniversityXi’anChina School of Electronic and Electrical Engineering University of LeedsLeedsUK Department of Advanced Materials Engineering for Information and Electronics Kyung Hee UniversityYonginSouth Korea Institute of Rehabilitation Engineering Binzhou Medical UniversityYantaiChina

Multiple strain sensors are required to identify individual forces/stresses on human joints and recognize how they work together in order to determine the motion’s direction and ***,current sensors cannot detect and differentiate the individual forces/stresses and their contributions to the motion from the sensors’electrical *** address this critical issue,we propose a concept of unimodal tension,bend,shear,and twist strain sensors with piezoelectric poly L-lactic acid *** then construct an integrated unimodal sensor(i-US)using the unimodal sensors and prove that the i-US can detect and differentiate individual strain modes,such as tensioning,bending,shearing,and twisting in complex *** demonstrate the potential impact of unimodal sensors,we design a sleeve and a glove with the i-US that can capture wrist motions and finger ***,we expect unimodal strain sensors to provide a turning point in developing motion recognition and control systems.

关键词： motion strain shearing

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Modeling and Simulation of Maximum Wind Energy Capture and Variable Pitch Control of Permanent-magnet Direct-drive Wind Power Generation System

Modeling and Simulation of Maximum Wind Energy Capture and V...

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第30届中国控制与决策会议

作者： Jian Guo Jiawen Si Dongjian Wu pengfei yue Harbin Engineering University

In recent years,with the development of economy and construction,clean energy has become the main development direction in the *** wind energy has clean,renewable and pollution-free advantages,which make it more widely applied than other renewable *** to effectively improve the utilization rate of wind energy has become a major *** paper takes the permanent magnet direct-drive wind power generation system as the research object,and researches on the maximum power point tracking and pitch control of machine *** using variable step hill-climbing searching method to track the maximum power point and pitch control with power compensation,the simulation model is established by using Matlab/Simulink and the simulation results and analysis are *** wind power generation units can fulfill maximum wind energy capture function and variable pitch control.

关键词： Wind Power Generation Pitch Control Variable Step Hill-climbing Searching Method

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Modeling and Simulation of Phase-locked Loop for Grid Voltage Based on the Improved Synchronous Reference Frame

Modeling and Simulation of Phase-locked Loop for Grid Voltag...

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第30届中国控制与决策会议

作者： Jian Guo pengfei yue Jiawen Si Yongliang Sun Qining Chen Harbin Engineering University

Aiming at the problem that the traditional phase-locked method can not accurately detect the phase and frequency of the grid voltage with the unbalanced three-phase power grid,the improved phase-locked loop of the synchronous coordinate system based on multivariable filter is *** using the multivariable filter to extract the positive sequence components of the fundamental voltage,the disturbance of the negative-sequence voltage components to the detection result of the PLL can be *** the same time,the feed forward frequency estimation module is added in the PLL structure,which can estimate the frequency of the input voltage signal and quickly eliminate the frequency error to make the phase locking time of PLL significantly be *** low-pass filter is provided to filter out harmonics of the positive sequence components of the fundamental ***,it is modeled and *** the simulation shows that the proposed improved algorithm can accurately lock the voltage phase and detect the shift of the grid frequency with good accuracy and effectiveness.

关键词： Multivariable Filter Synchronous Coordinate System PLL Separation of Positive and Negative Sequence Voltage Components Frequency Estimation

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Modeling and Simulation of Power Grid Characteristics Caused by Grid-connected Wind Power Generators

Modeling and Simulation of Power Grid Characteristics Caused...

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第37届中国控制会议

作者： Jian Guo pengfei yue Jiawen Si Qining Chen Yongliang Sun College of Mechanical and Electrical Harbin Engineering University

Due to the randomness of natural wind,the output power of wind power generators is of ***,with the increasing scale of grid-connected wind power generators,the impact it has on the grid cannot be *** take the permanent magnet directly driven wind power generators as the research object in this paper,the equivalent 150 MW wind-power farm model is established based on the wind power generator model and equivalent wind-power farm built up in this *** the basic of that,their simulation models are given by using Matlab/*** the simulation results and analysis are ***,the models of single grid-connected wind power generation system and single load are also ***,this paper establishes a 6-node power system model,through changing the location of connected-to-grid and the scale of grid-connected wind power generators penetration rate,it can be used to study on characteristics of power grid caused by grid-connected wind power generation *** to the simulation results and analysis,the characteristics of power grid with different location and penetration of grid-connected wind power generators are achieved.

关键词： Power Grid Wind Power Farm Penetration Rate Simulation

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弹丸激励下身管和摇架耦合系统动力学分析

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华中科技大学学报（自然科学版） 2019年第5期47卷 16-21页

作者：岳鹏飞王德石刘宝海军工程大学兵器工程学院湖北武汉430033

为了研究弹丸、摇架与轴向运动身管耦合系统的振动特性,根据哈密顿原理推导出移动弹丸激励下身管和摇架系统的振动方程,采用修正的伽辽金法将时变方程离散,运用四阶龙格-库塔法进行数值计算,结合算例验证了方程的正确性,研究了摇架和弹... 详细信息

为了研究弹丸、摇架与轴向运动身管耦合系统的振动特性,根据哈密顿原理推导出移动弹丸激励下身管和摇架系统的振动方程,采用修正的伽辽金法将时变方程离散,运用四阶龙格-库塔法进行数值计算,结合算例验证了方程的正确性,研究了摇架和弹丸的惯性效应对身管振动特性的影响.研究结果表明:所建立的含摇架的耦合系统模型可以综合考虑摇架角运动和扰动力矩的影响,丰富了身管振动影响因素的研究内容;增大弹丸加速度和减小弹丸质量偏心距有利于减小炮口振动响应.

关键词：身管摇架弹丸时变方程数值计算

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Design of novel dissolution-enhanced drug nanocrystals used glycyrrhizin as multifunctional stabilizer:a case study

Design of novel dissolution-enhanced drug nanocrystals used ...

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中国药学会第十三届青年药学科研成果交流会

作者： pengfei yue Yuanbiao Xie Junnan Xu Yang Liu Ming Yang Jiangxi University of Traditional Chinese Medicine

Objective This study is aimed at seeking a nature saponin-based stabilizer for production of drug nanosuspensions.A poorly soluble drug（andrographolide,Andro） was used as a model *** nanosuspensions with particle size of 487 nm were prepared by homogenization and converted into dried Andro nanocrystals（Andro-NC） stabilized with glycyrrhizin（GZ）.It was found that GZ was able to prevent the aggregation of Andro-NS during storage and improve the redispersibility of Andro-NC after freeze-drying and spray-drying,compared with polymer stabilizer *** freeze-dried and spray-dried Andro-NC with GZ exhibited excellent performance as evidenced by SEM *** was the reason that GZ possessed the interfacial property（37.02±0.29 N/m） and electrostatic effect（-43.6±0.9 mV）,which could easily adsorb onto the surface of hydrophobic drug nanocrystals and prevent from its *** PXRD and DSC results demonstrated that GZ did not alter the Andro crystal state in the *** can be used as an effective nature stabilizer for production of drug nanocrystals.

关键词： nanosuspensions nanocrystals glycyrrhizin stabilizer drug nanocrystals redispersibility

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