排序方式： 共有94条查询结果，搜索用时 15 毫秒
71.
聚焦跑步时髌股关节生物力学特征,探究穿着不同极简指数(MI)跑鞋对髌股关节接触力、应力等的即刻影响。选取15名习惯后跟着地的健康男性跑者,分别穿着两种MI跑鞋(MI 86%极简跑鞋和MI 26%缓冲跑鞋),使用Vicon红外运动捕捉系统、Kistler三维测力台同步采集3.33 m/s(速度变化范围±5%)跑速下的膝、踝关节运动学和地面反作用力,通过逆向动力学等计算股四头肌肌力、髌股关节接触力、髌股关节接触面积以及髌股关节接触应力。结果显示:两种跑鞋条件下的冲击力峰值和蹬地力峰值均无明显差异。与缓冲跑鞋相比,穿着极简跑鞋跑步时,膝关节最大屈曲角度显著降低(P<0.01);髌股关节接触面积显著减小(P<0.01);膝关节伸肌峰值力矩显著下降(P<0.01);髌股关节接触力和应力峰值均显著减小(P<0.05)。研究表明,相比缓冲跑鞋,穿着极简跑鞋在未影响触地后冲击力峰值的同时,通过降低伸膝力矩大幅度减少髌股关节接触力(下降17.02%)、降低髌股关节接触应力,从而有效改善支撑期髌股关节负荷,为进一步减小髌股关节疼痛综合征风险提供可能。 相似文献
72.
Teresa Cerchiara Giuseppe Chidichimo Maria Caterina Gallucci Rita Ferraro Danilo Vuono Alfonso Nastro 《Journal of Cultural Heritage》2009,10(3):396-402
One of the problems in the field of cultural heritage is the degradation of artworks and especially paintings. They appear very sensitive to environmental conditions. In this work, Spanish broom canvas is proposed as a novel painting support. In order to assess the deterioration properties of this new type of canvas, three degradation processes (exposure to wet atmosphere, to acidic attack and to UV light) were simulated and investigated. The deterioration state of the samples was monitored with Infrared Spectroscopy (FT-IR) and Thermogravimetric Analysis (TGA). The structure of the canvas was also analyzed by Scanning Electron Microscopy (SEM). These techniques were successfully applied to study the occurrence significant changes of samples. The exposure to acidic and UV attack produced deep changes on the samples (only on the canvas surface in the case of UV light), while no significant effect was identified on the sample after the exposure to wet atmosphere. The results obtained from Spanish broom canvas are reported in comparison to flax canvas. 相似文献
73.
对穿高跟鞋人群步态的生物力学研究 总被引：1，自引：0，他引：1
对穿高跟鞋人群步态的研究状况和进展作以综述,并探讨高跟鞋对人的损伤机制从而减少足部损伤;同时给造鞋业提供具体的人体足部生物力学参数,使其制造出更符合人体足部结构的高跟鞋。 相似文献
74.
新课改与“穿新鞋走老路” 总被引：15，自引：0，他引：15
郭华 《课程.教材.教法》2010,(1)
新一轮基础教育课程改革走过了八年不平凡的道路,但它的实施现状却被许多人概括为穿新鞋走老路。站在学校教育的立场上来看,人们所说的穿新鞋走老路现象,不是因为政府不作为、学者不关注,也不是因为教师不合格、不努力,而正是广大师生对某些片面、偏激的所谓新课改理念的自发纠偏,是学校教育规律发挥积极作用的实践体现。坚持教育改革、追求教育发展是教育实践与教育理论研究的永恒主题,但学校教育的任何改革都必须遵循学校教育的基本规律。只有在此基础上才能探索教育的新路子,促进教育的新发展。 相似文献
75.
刘红玉 《泉州师范学院学报》2009,27(1):59-64
自20世纪80年代以来,泉州以其独特的地理条件和人文优势,以家庭企业和专业市场为基础,在鞋业制造行业中逐步形成以大企业为核心、中小企业协作配套的特色产业集群。在生产经营中,泉州鞋业产业集群具有生产成本优势、产业组织优势、产品差异化优势、营销优势和创新能力优势。这些竞争优势的形成,从波特的钻石体系理论看,就是这些因素相互作用的结果。 相似文献
76.
目的:对短跑鞋鞋钉分布的合理性进行生物力学分析与评价,为科学选择或设计钉鞋提供参考;方法:18名专业短跑运动员分别穿三种不同鞋钉分布的钉鞋全力跑,经过上面铺有塑胶跑道的测力平板,测试足底和鞋钉尖端部位区域的压强分布与变化,通过高速录像分析运动员右脚着地前瞬间的重心水平速度;结果与讨论:两排7钉鞋在第一跖骨位置没有安装鞋钉不符合足底受力分布规律,鞋钉2和3位置设计重复;三排7钉鞋和8钉鞋设计合理性好于两排7钉鞋。两排7钉鞋在第二排的鞋钉4,如果安置在靠近脚掌内侧第二、三跖骨位置,效果会更好;8钉鞋第二排最外侧的鞋钉5作用不大,可以考虑去掉。结论:8钉鞋的加速性能最好,三排7钉鞋其次,两排7钉鞋最差;8钉鞋最符合足底受力分布实际情况,其次是三排7钉鞋,最差的为两排7钉鞋,在设计上有明显不合理之处。 相似文献
77.
Nick Faulk 《Journal of Library & Information Services in Distance Learning》2018,12(3-4):198-208
This case study provides insights into how one academic library scaled and structured its information literacy program for a rapidly growing online learning division. Particular attention is paid to strategies for reaching learners who bypass portions of the liberal studies requirements and techniques for designing information literacy modules taught by the instructor of record. This case study demonstrates how this library’s online information literacy program reached a new population of student while creating efficiencies with staff time. Attention is also paid to aspects of the program still under development, such as additional modules and a comprehensive assessment strategy. 相似文献
78.
《文物保护研究》2013,58(4):237-253
AbstractThe requirements for, and assessment of, suitable fabrics for artist canvas and for the structural reinforcement of easel paintings on canvas are presented. Crucially, the aesthetic and kinaesthetic, as well as physical properties of the canvas fabrics have been taken into account. To evaluate the fabrics the following properties were measured: stiffness, ultimate tensile strength, moisture response, crimp, drape, and lustre. Fabrics investigated include cotton, linen, polyester, polyamides, and carbonized fibres. Although polyester is yet to match linen or cotton kinaesthetically or aesthetically, overall it exhibits the best combination of properties. However, the results have shown that even when raw fibre material has suitable properties the finished woven fabric may not. This is because of the strong influence of the woven geometry on the final behaviour. It has been found that drape and lustre are very good properties to quantify some aspects of the feel and look of fabrics, in the context of conservation, and to provide a common language to ensure that the specification incorporates these aspects. 相似文献
79.
泉州鞋服产业在经历前期的高速增长后,目前已面临发展瓶颈。在民营企业"二次创业"背景下,实现产业转型升级已势在必行。通过对泉州鞋服产业转型升级的SWOT分析,认为其转型升级既拥有机遇又面临挑战。最后,基于企业、中间组织和政府三个层面提出升级对策。 相似文献
80.
陈伟民 《邢台职业技术学院学报》2006,23(5):55-57
鞋靴作为一种技术性与艺术性结合较为紧密的实用艺术形式,它包含两个层面:其一是它们的物质性和实用性;其二是它们的精神性和审美性。这两个层面互相联系、互相影响、互为因果。 相似文献