检索结果-南通市图书馆

On the mechanical aspect of additive manufactured polyether-ether-ketone scaffold for repair of large bone defects

在线全文

学校读者我要写书评

暂无评论

Biomaterials Translational 2022年第2期3卷 142-151页

作者： Seyed Ataollah Naghavi Changning sun Mahbubeh Hejazi Maryam Tamaddon Jibao Zheng Leilei Wang Chenrui Zhang Swastina Nath Varma Dichen Li Mehran Moazen Ling Wang Chaozong Liu Institute of Orthopaedic&Musculoskeletal Science University College LondonRoyal National Orthopaedic HospitalLondonUK State Key Laboratory for Manufacturing Systems Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’anShaanxi ProvinceChina Department of Mechanical Engineering University College LondonLondonUK.

Polyether-ether-ketone(PEEK)is widely used in producing prosthesis and have gained great attention for repair of large bone defect in recent years with the development of additive *** is due to its excellent biocompatibility,good heat and chemical stability and similar mechanical properties which mimics natural *** this study,three replicates of rectilinear scaffolds were designed for compression,tension,three-point bending and torsion test with unit cell size of 0.8 mm,a pore size of 0.4 mm,strut thickness of 0.4 mm and nominal porosity of 50%.Stress-strain graphs were developed from experimental and finite element analysis *** young’s modulus and yield strength of the scaffolds were measured from the slop of the stress-strain graph to be 395 and 19.50 MPa respectively for compression,427 and 6.96 MPa respectively for tension,257 and 25.30 MPa respectively for three-point bending and 231 and 12.83 MPa respectively for torsion *** finite element model was found to be in good agreement with the experimental *** fracture of the struct subjected to tensile strain was the main failure mode of the PEEK scaffold,which stems from the low crystallinity of additive manufacturing *** mechanical properties of porous PEEK are close to those of cancellous bone and thus are expected to be used in additive manufacturing PEEK bone implants in the future,but the lower yield strength poses a design challenge.

关键词： additive manufacturing bone scaffold finite element analysis mechanical behaviour lattice structure PEEK scaffold

劳动力迁移过程中的农村留守老人照料问题研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

人口学刊 2006年第4期28卷 14-18页

作者：孙鹃娟中国人民大学社会与人口学院北京100872

随着大量农村劳动力人口的外出务工,农村留守老人照料问题日益突出,2004年7月中国人民大学老年学研究所组织了大型“农村流出人口对老年人生活影响”的调查,以此为基础,探讨农村青年劳动力人口外流对农村老年人生活照料的影响。一方面... 详细信息

随着大量农村劳动力人口的外出务工,农村留守老人照料问题日益突出,2004年7月中国人民大学老年学研究所组织了大型“农村流出人口对老年人生活影响”的调查,以此为基础,探讨农村青年劳动力人口外流对农村老年人生活照料的影响。一方面照料提供者的减少,农业劳动、家务劳动等负担的增加加剧了农村留守老人的健康和日常生活照料问题;另一方面社会照料网络如农村基层组织、农村社区、志愿者等为留守老人提供的照料体系还不完善。随着社会的发展,社会网络对老年人提供的照料必将发挥越来越大的作用。我们不能因为农村劳动力外流弱化了家庭照料老人的功能而忽略了其对社会照料体系构建的作用。

关键词：留守老人照料劳动力迁移

从拯救现象到人的解放——论辩证法在历史唯物主义形成过程中的地位和作用

在线全文

学校读者我要写书评

暂无评论

湖南师范大学社会科学学报 2011年第5期40卷 53-56页

作者：孙云龙复旦大学历史系上海200433

从辩证法的最初形态谈起,简要地回顾了观念论辩证法在哲学史发展阶段中的几种重要样式,以及在黑格尔哲学中的最终完成形态。上述回溯为马克思所发动的辩证法革命提供了发生学背景,由此我们更能清晰地看到,究竟从何种意义上讲,历史唯物... 详细信息

从辩证法的最初形态谈起,简要地回顾了观念论辩证法在哲学史发展阶段中的几种重要样式,以及在黑格尔哲学中的最终完成形态。上述回溯为马克思所发动的辩证法革命提供了发生学背景,由此我们更能清晰地看到,究竟从何种意义上讲,历史唯物主义是对观念论辩证法的倒转,从而彰显出这场哲学革命的深刻意义。简要地梳理了早期马克思哲学文本中的辩证法表述方式,主要论及《黑格尔法哲学批判》和《1844年经济学—哲学手稿》,最终以《德意志意识形态》中物质生产辩证法为最后议题,并就此展开讨论,提出我们对马克思主义辩证法发展道路的理解方式。

关键词：辩证法历史唯物主义人的解放

从方言称谓词的历时变化看“从尊称谓”的影响

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

山西大学学报(哲学社会科学版) 2011年第1期34卷 61-64页

作者：孙玉卿暨南大学华文学院

在现代汉语亲属称谓系统中,有时对同一辈分的亲属关系却用不同的称谓方式,如:称呼妻子的哥哥为"大兄哥",称呼妻子的弟弟就是"小舅子";称呼比自己年长的同辈为"哥哥",称呼比自己年幼的同辈就是"兄弟"等。也就是说,在称谓中尽量避免使用"... 详细信息

在现代汉语亲属称谓系统中,有时对同一辈分的亲属关系却用不同的称谓方式,如:称呼妻子的哥哥为"大兄哥",称呼妻子的弟弟就是"小舅子";称呼比自己年长的同辈为"哥哥",称呼比自己年幼的同辈就是"兄弟"等。也就是说,在称谓中尽量避免使用"弟弟"等表示比自己年幼的称谓词,而采用其他的称谓方式。作者对这些称谓词的历时变化进行了考察,发现这一现象的存在与我国传统文化中"从尊称谓"的习俗有一定的联系。

关键词：亲属称谓历时变化从尊称谓从儿称谓

Real world epidemiological characteristics of acute ischemic stroke in young people in northwest Hubei Province

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Translational Neuroscience 2021年第2期6卷 1-7页

作者： Hui Huang Yi Bao Mengjiao Li Xiaodong Liu Xiaoqin Peng Yanpeng sun Wei Huang Department of Neurology Taihe Hospital of Shiyan CityAffiliated Hospital of Hubei Medical UniversityShiyan 442000China

Objective:acute ischemic stroke is oc-curing in younger and younger *** paper aims to explore the real-world epidemiological characteristics of young stroke patients in northwest ***:the information of acute stroke patients under 50 years old in northwest Hubei Province was collected,including age,gender,region,education level,smoking and drinking,onset season,etc,and epidemiological analysis was carried ***:a total of 344 patients with acute ischemic stroke were *** males accounted for 69.19%,and the average age was 44.94±5.61 years old;the females accounted for 30.18%,and the average age was 45.22±5.02 years *** distribution of patients varied,with most living in urban *** were more male patients than female *** proportion of patients with an education level below junior high school was higher than that of patients with an education level above junior ***-nine point thirty-six percent of all young people with stroke smoked and *** occurred in all seasons,but the incidence of stroke was relatively high in summer and *** was a significant difference in the ratio of males to females(Pyoung people in northwest Hubei Province is *** the increase of age,men in all ages are more prone to strokes than *** incidence of stroke among young people in urban areas is higher than in surrounding *** incidence rate decreases with the increase of education *** strokes occur in summer and autumn than in winter and *** and drinking do not show obvious effects on the incidence rate.

关键词： ischemic stroke epidemiology degree of education season real world

股权融资是否抑制了上市公司的创新投入——来自中国制造业的证据

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

现代财经（天津财经大学学报） 2014年第8期34卷 56-66页

作者：王娟孙早西安交通大学经济与金融学院陕西西安710061 西安建筑科技大学管理学院陕西西安710055

创新是企业持续增长的真正源泉,企业创新投入则是创新的物质前提。一般情况下,企业创新投入与企业融资渠道之间有着密切的关系。本文运用2006-2011年我国制造业A股上市公司的面板数据估计了股权融资对成熟度、资本密集度各不同的企业创... 详细信息

创新是企业持续增长的真正源泉,企业创新投入则是创新的物质前提。一般情况下,企业创新投入与企业融资渠道之间有着密切的关系。本文运用2006-2011年我国制造业A股上市公司的面板数据估计了股权融资对成熟度、资本密集度各不同的企业创新投入的效应。研究发现,我国A股上市公司的股权融资对于企业创新投入有抑制作用,相对于成熟型企业以及资本密集型企业,年轻企业以及资本密集度较低企业的股权融资对于创新投入的抑制作用更为显著。

关键词：创新投入股权融资成熟型企业资本密集型企业

Compatibility Rules of Neonatal Parenteral Nutrition Prescriptions Based on Association Rules and Hierarchical Cluster Analysis

在线全文

学校读者我要写书评

暂无评论

Medicinal Plant 2022年第1期13卷 39-43,51页

作者： Xinhong ZHAO Chao sun Yanwu ZHAO Ying JIN Ying WANG Zhenhua LIU Affiliated Hospital of Chengde Medical University Chengde 067000 China

[Objectives]To explore the compatibility rules of neonatal parenteral nutrition(PN)prescriptions based on association rules and hierarchical cluster analysis,thereby providing a reference for standardizing neonatal parenteral nutrition supportive therapy.[Methods]The data about neonatal PN formulations prepared by the Pharmacy Intravenous Admixture Services(PIVAS)of the Affiliated Hospital of Chengde Medical University from July 2015 to June 2021 were *** general information of the prescriptions and the frequency of drug use were analyzed with Excel 2019;the boxplot of drug dosing was drawn using GraphPad 8.0 software;and SPSS Modeler 18.0 and SPSS Statistics 26.0 were used to perform association rules and hierarchical cluster analysis.[Results]A total of 11488 PN prescriptions were collected from 1421 newborns,involving 18 kinds of drugs,which were divided into 11 types of *** rules analysis yielded 84 nutrient substance *** combination of fat emulsion-water-soluble vitamins-fat-soluble vitamins-glucose-amino acids had the highest confidence(99.95%).The hierarchical cluster analysis divided nutrients into 5 types.[Conclusions]The prescriptions of PN for newborns were composed of five types of nutrients:amino acids,fat emulsion,glucose,water-soluble vitamins,and fat-soluble *** to the lack of electrolytes and trace elements,appropriate drugs can be chosen to meet nutritional *** study provides reference basis for reasonable selection of drugs for neonatal PN prescriptions and further standardization of PN supportive therapy in newborns.

关键词： Neonatal parenteral nutrition prescription Pharmacy Intravenous Admixture Services Association rules Hierarchical cluster analysis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

高温气冷堆换料过程的球流数值模拟与分析

哈尔滨工程大学学报 2022年第8期43卷 1205-1211页

作者：严安孙喜明董玉杰清华大学核能与新能源技术研究院北京100084

针对高温气冷堆球床堆芯换料过程中复杂的球流运动行为,本文完成了球流数值模拟与分析。应用离散单元方法对高温气冷堆球床堆芯进行建模,实现了极低换料速度下间歇性堆芯球流的准静态流动模拟。对比分析了不同的杨氏模量与球床高度下球... 详细信息

针对高温气冷堆球床堆芯换料过程中复杂的球流运动行为,本文完成了球流数值模拟与分析。应用离散单元方法对高温气冷堆球床堆芯进行建模,实现了极低换料速度下间歇性堆芯球流的准静态流动模拟。对比分析了不同的杨氏模量与球床高度下球流速度分布、流线分布和局部滞留等球床特性的差异,明确了杨氏模量的选取对于模拟结果可信程度的影响。结果表明:球体刚度、球床内球体数量的变化会显著影响球床底锥结构内的球流特性,球床的球流流态随球体数量的减少由整体流转变为漏斗流,球体杨氏模量不低于107 Pa,能较好地保证计算精度。

关键词：高温气冷堆球床式反应堆球流运动准静态流动离散单元法杨氏模量滞留效应颗粒流流态

中国字幕组:网络亚文化生产场域中的困境与博弈

在线全文

学校读者我要写书评

暂无评论

重庆邮电大学学报（社会科学版） 2016年第1期28卷 81-86页

作者：孙黎彭爱萍湖北工程学院文学与新闻传播学院湖北孝感432000

当下,青年人对于新技术的热切拥抱和掌握程度都远超于他们的父辈,这使得他们能够在网络空间利用新媒介技术主动创建一个亚文化生产场域,以此声张他们所认同的价值理念,但这个亚文化生产场域并非一个"乌托邦"式的理想空间,其中存在着各... 详细信息

当下,青年人对于新技术的热切拥抱和掌握程度都远超于他们的父辈,这使得他们能够在网络空间利用新媒介技术主动创建一个亚文化生产场域,以此声张他们所认同的价值理念,但这个亚文化生产场域并非一个"乌托邦"式的理想空间,其中存在着各种矛盾与权力宰制。以中国网络字幕组为研究对象,从三个方面分析青年群体在网络亚文化生产场域中面临的困境与博弈行为,肯定以网络字幕组为代表的青年亚文化群体在文化实践过程中所起到的积极作用。

关键词：青年亚文化网络字幕组困境与博弈