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Proximal Femur Bionic Nail (PFBN): A Panacea for Unstable Intertrochanteric Femur Fracture

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Engineering 2024年第6期37卷 152-158页

作者： Kaixuan zhang Wei Chen Yingze zhang School of Medicine Nankai UniversityTianjin 300071China Department of Orthopedic Surgery of Hebei Province The Third Hospital of Hebei Medical UniversityShijiazhuang 050051China Key Laboratory of Biomechanics of Hebei Province Orthopaedic Research Institute of Hebei ProvinceShijiazhuang 050051China National Health Commission(NHC)Key Laboratory of Intelligent Orthopeadic Equipment The Third Hospital of Hebei Medical UniversityShijiazhuang 050051China Chinese Academy of Engineering Beijing 100088China

With the aging population,intertrochanteric femur fracture in the elderly has become one of the most serious public health issues and a hot topic of research in trauma *** to the limitations of internal fixation techniques and the insufficient mechanical design of nails,the occurrence of complications delays patient recovery after surgical *** of a proximal femur bionic nail(PFBN)based on zhang’s N triangle theory provides triangular supporting fixation,which dramatically decreases the occurrence of complications and has been widely used for clinical treatment of unstable intertrochanteric femur fracture *** this work,we developed an equivalent biomechanical model to analyze improvement in bone remodeling of unstable intertrochanteric femur fracture through PFBN *** results show that compared with proximal femoral nail antirotation(PFNA)and InterTan,PFBN can dramatically decrease the maximum strain in the proximal *** on Frost’s mechanostat theory,the local mechanical environment in the proximal femur can be regulated into the medium overload region by using a PFBN,which may render the proximal femur in a state of physiological overload,favoring post-operative recovery of intertrochanteric femur fracture in the *** work shows that PFBN may constitute a panacea for unstable intertrochanteric femur fracture and provides insights into improving methods of internal fixation.

关键词： Intertrochanteric femur fracture Internal fixation Proximal femur bionic nail(PFBN) Biomechanics Bone remodeling

Improving lipid production by Rhodotorula glutinis for renewable fuel production based on machine learning

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Frontiers of Chemical Science and Engineering 2024年第5期18卷 23-35页

作者： Lihe zhang Changwei zhang Xi Zhao Changliu He Xu zhang National Energy R&D Center for Biorefinery Beijing University of Chemical TechnologyBeijing 100029China Collage of Life Science and Technology Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Bioprocess Beijing University of Chemical TechnologyBeijing 10029China

Microbial lipid fermentation encompasses intricate complex cell growth processes and heavily relies on expert experience for optimal *** modeling of the fermentation process assists researchers in making intelligent decisions,employing logical reasoning and strategic planning to optimize lipid *** this study,the effects of medium components and concen-trations on lipid fermentation were investigated,*** then,leveraging the collated data,a variety of machine learning algorithms were used to model and optimize the lipid fermentation *** models,based on artificial neural networks and support vector machines,achieved R?values all higher than 0.93,ensuring accurate predictions of the fermentation *** linear regression was used to evaluate the respective target parameter,which were affected by the medium components of lipid ***,single and multi-objective optimiza-tion were conducted for lipid fermentation using the genetic *** results demonstrated the maximum biomass of 50.3 g·L^(-1) and maximum lipid concentration of 14.1 g:L^(-1) with the error between the experimental and predicted values less than 5%.The results of the multi-objective optimization reveal the synergistic and competitive relationship between biomass,lipid concentration,and conversion rate,which lay a basis for in-depth optimization and amplification.

关键词： microbial lipid machine learning artificial neural network support vector machine genetic algorithm

Nanophononic metamaterials induced proximity effect in heat flux regulation

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Frontiers of physics 2024年第2期19卷 149-156页

作者： Jian zhang Haochun zhang Gang zhang School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Institute of High Performance Computing Agency for ScienceTechnology and Research(A*STAR)Singapore 138632Singapore

Recent studies have shown that the construction of nanophononic metamaterials can reduce thermal conductivity without affecting electrical properties,making them promising in many fields of application,such as energy conversion and thermal ***,although extensive studies have been carried out on thermal conductivity reduction in nanophononic metamaterials,the local heat flux characteristic is still *** this work,we construct a heat flux regulator which includes a silicon nanofilm with silicon *** regulator has remarkable heat flux regulation ability,and various impacts on the regulation ability are ***,even in the region without nanopillars,the local heat current is still lower than that in pristine silicon nanofilms,reduced by the neighboring nanopillars through the thermal proximity *** combine the analysis of the phonon participation ratio with the intensity of localized phonon modes to provide a clear *** findings not only provide insights into the mechanisms of heat flux regulation by nanophononic metamaterials,but also will open up new research directions to control local heat flux for a broad range of applications,including heat management,thermoelectric energy conversion,thermal cloak,and thermal concentrator.

关键词： nanophononic metamaterials proximity effect

Optimising multi-vent module-based adaptive ventilation using a novel parameter for improved indoor air quality and health protection

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Building Simulation 2024年第1期17卷 113-130页

作者： Haotian zhang Xiaoxiao Ding Weirong zhang Weijia zhang Yingli Xuan Key Laboratory of Green Built Environment and Energy Efficient Technology Beijing University of TechnologyBeijing 100124China Department ofArchitecture TokyoPolytechnic UniversityTokyoJapan

As infectious respiratory diseases are highly transmissible through the air,researchers have improved traditional total volume air distribution systems to reduce infection ***-vent module-based adaptive ventilation(MAV)is a novel ventilation type that facilitates the switching of inlets and outlets to suit different indoor scenarios without changing ductwork ***,little research has evaluated MAV module sizing and air velocity selection,both related to MAV system efficiency in removing contaminants and the corresponding level of protection for occupants in the ventilated ***,the module-source offset ratio(MSOR)is proposed,based on the MAV module size and its distance from an infected occupant,to inform selection of optimal MAV module *** fluid dynamics simulations illustrated contaminant distribution in a two-person MAV equipped *** phase particles modelled respiratory contaminants from the infected occupant,and contaminant concentration distributions were compared under four MAV air distribution layouts,three air velocities,and three module sizes considered using the *** indicate that lower air velocities favour rising contaminant levels,provided the ventilation rate is *** contaminant discharge can be achieved when the line of outlets is located directly above the infected *** this parameter to guide MAV system design,85.7% of contaminants may be rendered harmless to the human body within 120 s using the default air vent layout.A more appropriate supply air velocity and air vent layout increases this value to 91.4%.These results are expected to inform the deployment of MAV systems to reduce airborne infection risk.

关键词： multi-vent module-based adaptive ventilation computational fluid dynamics indoor air quality infection control

Non-isothermal kinetics and characteristics of calcium carbide nitridation reaction with calcium-based additives

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Frontiers of Chemical Science and Engineering 2024年第4期18卷 49-61页

作者： Zhihan zhang Mengxiao Yu Xiaoyu zhang Jinli zhang You Han School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

The nitridation reaction of calcium carbide and N_(2) at high temperatures is the key step in the production of ***,the challenges faced by this process,such as high energy consumption and poor product quality,are mainly attributed to the lack of profound understanding of the *** study aimed to improve this process by investigating the non-isothermal kinetics and reaction characteristics of calcium carbide nitridation reaction at different heating rates(10,15,20,and 30℃·min^(-1))using thermogravimetric *** kinetic equation for the nitridation reaction of additive-free calcium carbide sample was obtained by combining model-free methods and model-fitting *** effect of different calcium-based additives(CaCl_(2) and CaF_(2))on the reaction was also *** results showed that the calcium-based additives significantly reduced reaction temperature and activation energy E_(a) by about 40% with CaF_(2) and by 55%-60% with CaCl_(2).The reaction model f(α)was also changed from contracting volume(R3)to 3-D diffusion models with D3 for CaCl_(2) and D4 for CaF_(2).This study provides valuable information on the mechanism and kinetics of calcium carbide nitridation reaction and new insights into the improvement of the lime-nitrogen process using calcium-based additives.

关键词： lime-nitrogen calcium carbide calciumbased additive thermogravimetric analysis nonisothermal kinetics

一步法合成磁性功能材料Fe_3O_4/C及其应用研究

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宿州学院学报 2015年第1期30卷 82-84,113页

作者：张延琪方森林滁州学院材料与化学工程学院安徽滁州239012

以三氯化铁和柠檬酸钠为原料、葡萄糖为碳源,在水热体系中一步合成了磁性功能材料Fe3O4/C,然后利用其表面丰富的羟基原位还原Pd2+,合成Fe3O4/C/Pd,用于催化卤代芳烃与苯硼酸的Suzuki偶联反应。所得样品采用电子扫描显微镜(SEM)、X射线... 详细信息

以三氯化铁和柠檬酸钠为原料、葡萄糖为碳源,在水热体系中一步合成了磁性功能材料Fe3O4/C,然后利用其表面丰富的羟基原位还原Pd2+,合成Fe3O4/C/Pd,用于催化卤代芳烃与苯硼酸的Suzuki偶联反应。所得样品采用电子扫描显微镜(SEM)、X射线粉末衍射仪(XRD)、傅立叶变换红红外光谱仪(FT-IR)热重分析仪进行表征。实验结果表明,Fe3O4/C/Pd可高效催化溴代芳烃与苯硼酸的Suzuki偶联反应,而对于活性低的氯代芳烃的催化效率为中等,产率为55%。催化剂可以进行磁性分离,且可循环性很好,在连续使用3次后催化活性依然很高。

关键词：一步法合成 Fe3O4/C Fe3O4/C/Pd 催化

基于CiteSpace的手法整复夹板固定治疗桡骨骨折的可视化分析

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中医临床研究 2023年第32期15卷 138-142页

作者：张延琦王卫国山东中医药大学山东济南250000 山东中医药大学附属医院山东济南250000

目的:可视化分析手法整复夹板固定桡骨骨折研究方向、热点及前沿,总结疾病的客观规律,为研究引入新理念及预测未来发展趋势提供参考。方法:检索中国知网数据库有关手法整复夹板固定治疗桡骨骨折领域符合标准的文献(文献发表时间为2011年... 详细信息

目的:可视化分析手法整复夹板固定桡骨骨折研究方向、热点及前沿,总结疾病的客观规律,为研究引入新理念及预测未来发展趋势提供参考。方法:检索中国知网数据库有关手法整复夹板固定治疗桡骨骨折领域符合标准的文献(文献发表时间为2011年1月1日-2021年12月31日);进行关键词共现分析、聚类分析、突现分析、作者及机构的节点分析。结果:共纳入文献1041篇,研究机构283个,涉及关键词358个。合作最密切的是以马奇翰和刘锦涛为核心的作者团队;发文数量最多的机构是湖南中医药大学和四川省骨科医院;热点关键词为手法整复、桡骨骨折、夹板固定等;突现关键词为双骨折、观察、掌倾角等。结论:手法整复夹板固定治疗桡骨骨折研究领域目前发展已经较为全面。突现分析发现,近年来前沿研究围绕着桡骨骨折辅助中医药内外治疗、骨折复位后再移位等危险因素、康复功能训练、改善骨密度提高腕关节功能等几方面展开。推测未来一段时间内,以上内容仍将是该领域的前沿热点。分析结果中未发现有显著影响力的核心研究团队和机构,多数机构合作也仅集中于内部及其附属医院,为更好的学术交流,跨机构的交流合作亟待进一步加强。

关键词：夹板固定桡骨骨折知识图谱可视化分析

相邻施工影响下砌体结构基础变形控制参数的比较分析

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结构工程师 2012年第6期28卷 108-112页

作者：张晏齐张伟平顾祥林蒋利学同济大学建筑工程系上海200092 上海市建筑科学研究院(集团)有限公司上海200011

针对高层建筑基坑及城市地铁隧道施工对相邻建筑物的影响,总结分析了基坑与隧道施工引起地基基础变形规律以及由此导致的房屋损伤特点,比较分析了现行规范和国内外学者提出的砌体结构基础变形控制参数及限值。结果表明,与砌体房屋损伤... 详细信息

针对高层建筑基坑及城市地铁隧道施工对相邻建筑物的影响,总结分析了基坑与隧道施工引起地基基础变形规律以及由此导致的房屋损伤特点,比较分析了现行规范和国内外学者提出的砌体结构基础变形控制参数及限值。结果表明,与砌体房屋损伤直接相关的基础沉降参数主要有相对弯曲和水平拉伸,我国现行规范关于砌体结构基础沉降控制参数的限值未与砌体房屋结构损伤直接相关,建议采用相对弯曲作为砌体房屋基础沉降控制参数,相关限值宜考虑建筑物重要性、结构整体性、受力状态、初始损伤等因素的影响。

关键词：砌体结构结构损伤控制参数基础沉降

Particle size spatial distribution in landslide dams

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Journal of Mountain Science 2024年第6期21卷 1886-1903页

作者： zhang Jingyi zhang Jianmin State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu 610064China

The particle composition and spatial distribution of landslide-induced dam bodies are critical geotechnical parameters for studying the hazards of dam-break ***,current research often neglects the influence of the initial particle composition and spatial distribution of the landslide on the particle composition and spatial distribution of the landslide *** study investigated the impact of initial particle size distribution,volume,and sliding length on the energy and velocity changes of characteristic particles during the sliding process and the spatial distribution of particle sizes in the landslide dam *** simulations and physical models were employed to examine the effects of sequential gradient arrangements(where particle sizes decrease from top to bottom)and four other different initial particle arrangements on the energy and velocity changes of particles and the spatial distribution of particle sizes in the dam *** study reveals the characteristics of translational and rotational energy of different particles and the laws of mechanical energy conversion,obtaining the spatial distribution patterns of particle sizes in landslide-induced *** results show that under the sequential gradient arrangement,the energy dissipation of the landslide movement is lower,with larger particles mainly distributed at the distal end and smaller particles at the proximal end of the landslide *** contrast,under the reverse gradient arrangement,the energy dissipation of the landslide movement is higher,and the distribution pattern of the dam particles is opposite to that of the sequential gradient *** the other arrangement modes,the spatial distribution of dam particles falls between the aforementioned *** is a positive correlation between particle size and translational kinetic energy within the particle flow during the landslide process,and rotational motion increases energy *** constant slope conditions,sliding

关键词： Particle size distribution Landslide Numerical simulation Discrete element method