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偏瘫患者下台阶过程下肢生物力学特征分析

医用生物力学 2024年第1期39卷 125-131页

作者：周鲁星孟庆华刘文红张楠崔帅琦刘姣天津体育学院运动健康学院天津301617 天津体育学院体育经济与管理学院天津301617 天津市运动损伤与康复虚拟仿真实验教学中心天津301617 中国人民解放军联勤保障部队天津康复疗养中心天津300191

目的对比分析偏瘫患者以不同方式下台阶过程中下肢生物力学特征,为降低患者下台阶过程中的跌倒风险提供理论依据。方法选取10名正常人和20名符合要求的偏瘫患者,使用Qualisys动作捕捉系统和Kistler三维测力台对受试者下台阶过程中的运... 详细信息

目的对比分析偏瘫患者以不同方式下台阶过程中下肢生物力学特征,为降低患者下台阶过程中的跌倒风险提供理论依据。方法选取10名正常人和20名符合要求的偏瘫患者,使用Qualisys动作捕捉系统和Kistler三维测力台对受试者下台阶过程中的运动学和动力学数据进行收集,分析其在下台阶过程中的生物力学特征和跌倒风险。结果相较于正常人和先用健足下台阶(steps on the healthy side,SHS),先用患足下台阶(steps on the affected side,SAS)时,患侧下肢各关节屈伸活动幅度较小;SHS降低了健侧膝关节屈伸活动幅度,患侧下肢各关节屈伸活动幅度较SAS大;SAS下台阶左右方向地面反作用力(ground reaction force,GRF)曲线变化与正常人较为一致,患侧落地瞬间垂直GRF最大为1.05倍体重,健侧为1.25倍体重,低于正常人(1.5倍体重);SHS下台阶健侧落地瞬间最大垂直GRF为1.85倍体重,高于SAS和正常人。结论相较于SAS,患者使用SHS下台阶患侧关节活动幅度和落地瞬间垂直GRF较大,更难掌握。SAS更符合偏瘫患者下台阶的生物力学特征。

关键词：偏瘫下台阶跌倒关节角度地面反作用力

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场景驱动背景下面向产业互联智能协同的云平台

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软件导刊 2024年第5期23卷 83-88页

作者：刘文虹何建佳上海理工大学管理学院上海200093

随着数字技术的迭代升级与实践应用,场景驱动成为新经济时代科技型产业创新的新引擎,并赋能产业互联向数字化、智能化的方向革新。然而,场景驱动下产业供应链合作成员不断增加而引发的资源信息堵塞壁垒、业务繁多交叉以及协同关系错综... 详细信息

随着数字技术的迭代升级与实践应用,场景驱动成为新经济时代科技型产业创新的新引擎,并赋能产业互联向数字化、智能化的方向革新。然而,场景驱动下产业供应链合作成员不断增加而引发的资源信息堵塞壁垒、业务繁多交叉以及协同关系错综复杂等问题往往会影响组织间的协同效率及服务质量。为此,提出一种场景驱动下的产业联盟业务智能协同解决方案。该方案首先分析了场景驱动产业互联下多联盟成员之间新的协同需求,提出面向云平台的产业供应链业务协同模型,并构建支撑多源异构业务数据交互的云平台服务架构体系。最后,以应急防疫物资供需产业库存协同为例,验证了云平台智能协同模型的可行性,以期为该领域研究提供参考借鉴。

关键词：场景驱动产业互联智能协同云平台产业供应链

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Effects of deformation twins on microstructure evolution,mechanical properties and corrosion behaviors in magnesium alloys-A review

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Journal of Magnesium and Alloys 2022年第9期10卷 2334-2353页

作者： Lianhui Li wenhong liu Fugang Qi Di Wu Zhiqiang Zhang Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China Engineering Research Center of Advanced Materials Preparing Technology Ministry of EducationNortheastern UniversityShenyang 110819China College of Information Science and Engineering Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Due to lattice reorientation,grain segmentation,induced recrystallization,twins play a very important role in regulating texture,refining grains,improving mechanical properties and corrosion resistance,and has received more extensive *** studies have shown that{10-12}tensile twins(TTWs)are easily activated in large quantities due to the lower critical resolve shear stresses(CRSS).Introduction of TTWs under uniaxial compression improved the strength,ductility,and formability of magnesium(Mg)***,TTWs produced by multi-directional impact forging(MDIF)can optimize the microstructure by dividing grains and promoting recrystallization,resulting in significant improvement of mechanical ***{10-11}compressive twins(CTWs)and{10-11}-{10-12}double twins(DTWs)can promote dynamic recrystallization(DRX),they are also favorable nucleation sites for *** addition,the type and volume fraction of twins can affect the corrosion resistance,and they also play different roles in the corrosion process of different Mg *** have shown great potential for improving structure and properties,but a comprehensive and critical discussion of twins in Mg alloys is still ***,based on previous studies,this article reviews the common types and variants of twins in Mg alloys,influencing factors,and their effects on the microstructure,mechanical properties and corrosion *** addition,some interesting ideas are being proposed for further research.

关键词： Twins Mg alloy Microstructure Mechanical properties Corrosion resistance

PET塑料降解及其降解酶改造方法的研究进展

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石油化工高等学校学报 2024年第1期37卷 16-24页

作者：经楠楠刘文红李强李青青王霞姚建庄济南大学生物科学与技术学院山东济南250022

塑料是一种合成或天然的高分子聚合物,因其良好的耐用性和可塑性,已在工业领域和日常生活中得到广泛应用。聚对苯二甲酸乙二醇酯(PET)是常用的一种塑料,在多个领域都有广泛应用,但是,未经过人工处理的PET在自然情况下很难被降解,给生态... 详细信息

塑料是一种合成或天然的高分子聚合物,因其良好的耐用性和可塑性,已在工业领域和日常生活中得到广泛应用。聚对苯二甲酸乙二醇酯(PET)是常用的一种塑料,在多个领域都有广泛应用,但是,未经过人工处理的PET在自然情况下很难被降解,给生态系统带来严重负担,因此PET塑料的降解与再生问题已经成为全球性的热点问题,也衍生了许多降解的方法,如光降解法、热降解法、生物降解法等。其中,生物降解法因绿色环保而被认为是一种理想的降解方法。生物降解法中酶降解方法是一种十分环保且较高效的降解方法,而PET降解酶的设计改造成为PET降解的重点问题。综述了现阶段降解塑料的主要方法、生物降解法降解PET的常用酶以及PET降解酶的改造方法,以期为PET的快速降解与再生提供理论依据。

关键词：塑料降解生物降解法聚对苯二甲酸乙二醇酯 PET降解酶

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Boosting the Activity and Stability with Dual-Metal-N Couplings for Li–O_(2)Battery

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Energy & Environmental Materials 2022年第3期5卷 918-927页

作者： Shan Wu Di Wu Dawei Zhang wenhong liu Hao Luo Jianbo He Qingchun Yang Zhiwei Li Ruiping liu School of Chemistry and Chemical Engineering Hefei University of TechnologyHeifei Anhui 230009China Department of Materials Science and Engineering China University of Mining and Technology-Beijing CampusBeijing 100083China

Electrocatalysts with high efficiency are crucial for improving the storage capacity and electrochemical stability of lithium–oxygen batteries(LOBs).In this work,through a facile hydrothermal method,cobalt–nitrogen-doped carbon nanocubes(Co–N/C),the calcination products of zeolitic imidazolate framework(ZIF–67)are encapsulated by ultrathin C–MoS_(2) nanosheets to obtain Co–N/C@C–MoS_(2) composites which are used as host materials for the oxygen *** synergistic effect between Co–N_(x) active sites and Mo–N coupling centers effectively promotes the formation and decomposition of Li_(2)O_(2) during repeated discharge and charge *** mesoporous C–MoS_(2) nanosheets with delicately designed morphology facilitate charge transfer and account for improved reaction kinetics and more importantly,suppressed side reactions between the carbon materials and the *** oxygen cathode with the Co–N/C@C–MoS_(2)host shows a high initial discharge specific capacity of 21197 mAh g^(-1)and a long operation life of 332 *** calculation provides in-depth explanation for the reaction mechanism and offers insights for the rational design of electrocatalysts for LOBs.

关键词： carbon-based electrocatalyst cobalt and nitrogen doping electrochemical stability Li–O_(2)batteries molybdenum disulfide

进气蜗壳区网格质量对卧轮式分级机内流场模拟的影响分析

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石油管材与仪器 2024年第4期10卷 60-67页

作者：王蕊杨文哲陈毅张瑶李东风刘文红中国石油集团工程材料研究院有限公司国家市场监管重点实验室(石油管及装备质量安全)陕西西安710077 中国石油塔里木油田公司油气田产能建设事业部新疆库尔勒841000

为研究进气蜗壳区网格质量对卧轮式分级机内流场模拟结果的影响,基于ICEM CFD前处理软件总结4种关键网格质量评价指标选用原则,对卧轮式分级机网格模型质量进行定量评估,采用数值模拟方法对比分析了3种不同网格质量模型下卧轮式分级机... 详细信息

为研究进气蜗壳区网格质量对卧轮式分级机内流场模拟结果的影响,基于ICEM CFD前处理软件总结4种关键网格质量评价指标选用原则,对卧轮式分级机网格模型质量进行定量评估,采用数值模拟方法对比分析了3种不同网格质量模型下卧轮式分级机内流场的模拟结果。研究结果表明,选用Orthogonal Quality、Skew指标对卧轮式分级机网格模型进行优化,可有效提高网格整体质量,优化后Grid-3网格模型的***值为0.98,较Grid-1、Grid-2分别提高36.1%和10.1%;卧轮式分级机进气蜗壳区的网格质量对其仿真计算的稳定性、收敛性、效率及精度具有显著影响,Grid-1发生迭代残差大幅震荡、计算终止且未收敛的情况,Grid-2能够反映分级机内流场特性及颗粒运动特性,但计算精度、效率欠佳;Grid-3避免了上述情况,表现出良好的稳定性、收敛性,更准确地反映了分级机内流场特性及颗粒运动特性,较Grid-2的计算效率提高13.82%,压降相对误差降低13.53%,分级粒径误差减少23.7%,离散相模拟结果与粉煤灰的分级试验结果更为吻合。

关键词：卧轮式分级机 CFD模拟网格质量评价指标 ICEM CFD

油气田废弃旧油管绿色再制造关键技术创新与工业化应用

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科技和产业 2024年第13期24卷 213-219页

作者：刘文红谷锋锋李京川杨力能张益铭王联国中国石油集团工程材料研究院有限公司国家市场监管重点实验室(石油管及装备质量安全) 西安710077 陕西延长石油(集团)有限责任公司气田公司陕西延安717300

近年来,陕北气田在试油、试气以及压裂作业后,产生了大量的废旧油管,亟需解决回收现场混放废旧油管钢级材质分选困难、经修复后的API(美国石油学会)螺纹粘扣及采用的特殊扣无法通用等再制造油管使用周期不长等问题。提出基于“化学成分... 详细信息

近年来,陕北气田在试油、试气以及压裂作业后,产生了大量的废旧油管,亟需解决回收现场混放废旧油管钢级材质分选困难、经修复后的API(美国石油学会)螺纹粘扣及采用的特殊扣无法通用等再制造油管使用周期不长等问题。提出基于“化学成分+硬度”现场测试值判据的综合分析方法区分管材的钢级和材质,以N80及以上钢级抗拉强度高、抗粘扣性能优异的特殊螺纹油管代替加厚油管作为压裂管柱专用扣型,再生油管经全尺寸实物试验评价及示范应用,质量指标和服役性能满足气井压裂作业工况要求。项目试验及推广期间,完成安62井、子22-2等现场压裂83井次,使用再生油管30 896根(包括变扣和短节),节约管材投资总额2 798余万元。同时开展了再生油管多次压裂试验,其中开展二次压裂14井次,三次压裂2井次,最大作业深度达到3 854 m,作业压力52~54 MPa,取得较好成效。通过旧油管绿色再制造,将旧油管变为满足压裂作业使用要求的作业管柱,不仅能延长管材服役周期,也能大量挽回油气田的间接损失,经济效益和社会效益可观。

关键词：旧油管绿色再制造技术钢级材质分选特殊螺纹接头压裂

Climate change filtered out resource-acquisitive plants in a temperate grassland in Inner Mongolia,China

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Science China(Life Sciences) 2024年第2期67卷 403-413页

作者： Heying Jing Xingshuo Xiong Feng Jiang Xucai Pu wenhong Ma Daijiang Li Zhongling liu Zhiheng Wang Institute of Ecology and Key Laboratory for Earth Surface Processes of the Ministry of Education College of Urban and Environmental SciencesPeking UniversityBeijing 100871China Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau School of Ecology and EnvironmentInner Mongolia UniversityHohhot 010021China Department of Biological Sciences Louisiana State UniversityBaton RougeLA 70803USA

Global climate change has led to the decline of species and functional diversity in ecosystems,changing community composition and ecosystem ***,we still know little about how species with different resource-use strategies(different types of resource usage and plant growth of plants as indicated by the spectrum of plant economic traits,including acquisitive resource-use strategy and conservative resource-use strategy)would change in response to climate change,and how the changes in the diversity of species with different resource-use strategies may influence community-level ***,using long-term(1982–2017)observatory data in a temperate grassland in Inner Mongolia,we investigated how climate change had affected the species richness(SR)and functional richness(FRic)for the whole community and for species with different resource-use ***,based on data for four traits representing leaf economics spectrum(leaf carbon concentration,leaf nitrogen concentration,leaf phosphorus concentration,and specific leaf area),we divided 81 plant species appearing in the grassland community into three plant functional types representing resource-acquisitive,medium,and resource-conservative *** then analyzed the changes in community-level productivity in response to the decline of SR and FRic at the community level and for different resource-use *** found that community-level SR and FRic decreased with drying climate,which was largely driven by the decline of diversity for resource-acquisitive ***,community-level productivity remained stable because resource-conservative species dominating this grassland were barely affected by climate *** study revealed distinctive responses of species with different resource-use strategies to climate change and provided a new approach based on species functional traits for predicting the magnitude and direction of climate change effects on ecosystem functions.

关键词： biodiversity ecological strategy functional diversity functional trait long-term change species diversity

Endogenous retrovirus activation: potential for immunology and clinical applications

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National Science Review 2024年第4期11卷 21-23页

作者： Jundan Yu Peishan Qiu Jingwen Ai Bo liu Guan-Zhu Han Fan Zhu wenhong Zhang Jie Cui Department of Infectious Diseases Shanghai Key Laboratory of Infectious Diseases and Biosafety Emergency Response National Medical Center for Infectious Diseases Huashan Hospital Shanghai Medical College Fudan University CAS Key Laboratory of Molecular Virology &Immunology Shanghai Institute of Immunity and Infection Chinese Academy of Sciences University of Chinese Academy of Sciences Shanghai Huashen Institute of Microbes and Infections College of Life Sciences Nanjing Normal University State Key Laboratory of Virology and Department of Medical Microbiology School of Basic Medical SciencesWuhan University The Institute of Infection and Health Research Fudan University Key Laboratory of Medical Molecular Virology(MOE/MOH) Shanghai Medical CollegeFudan University Laboratory for Marine Biology and Biotechnology Qingdao Marine Science and Technology Center

Endogenous retroviruses (ERVs), the remnants of ancient retrovirus infections, constitute approximately 8% of the human genome and play important roles in human evolution, development,and diseases. Multiple drugs, such as DNA methyltransferase inhibitors and lysine-specific histone demethylase 1inhibitors, reactivate ERVs, induce viral mimicry and trigger innate immune responses to enhance tumor immunogenicity.

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