《材料力学》双语教学的实践与研究

《材料力学》课程是土木工程专业重要的专业基础课.本文论述了如何采用英文版《材料力学》教材进行双语教学改革的体会,阐述了新形势下对教学模式改革的观点.     

Leg amputation side determines performance in curve sprinting: a case study on a Paralympic medalist

The lower limb kinetics of curve sprinting in amputees are not well described in the literature, particularly with respect to the effect of the side of amputation. This is an issue due to the importance of the knowledge for prosthetic design and classification of athletes. Thus, the aim of this study was to investigate the influence of side of amputation on curve sprinting performance in athletes with a unilateral leg amputation. A three-dimensional motion analysis system (Vicon), four force plates (Kistler) and a modified mathematical human model (ALASKA) were used to compare clockwise and counter clockwise curve sprinting lower limb kinematics and kinetics of a Paralympic medalist with a left-sided knee exarticular amputation. Results reveal that vertical ground reaction force application and total vertical impulse were lower when the affected limb was at the inside of the curve. The unaffected limb showed joint mechanics different to those established for non-amputee athletes and might contribute better to propulsion when being the inside limb. Curve sprinting biomechanics and the ability to attain high radial velocities are directly dependent on the side of amputation relative to the curve direction in a unilateral amputee athlete of highest performance level.     

大学本科力学类课程的公式辅助记忆方法研究

力学课程作为工科专业的重要基础课程,有大量公式需要学生记忆和掌握,从而给学习带来了一定困难。文章作者从力学课程的特点出发,结合多年的教学实践经验,针对多门力学课程,总结出了多种辅助记忆公式的方法,并取得了良好的授课效果。     

数值模拟技术在本科工程力学课程教学中的应用

在分析工程力学课程教学现状的基础上,提出了将数值模拟方法引入到工程力学教学中来,将工程力学的教学与数值模拟技术紧密结合在一起,使工程力学教学中难以讲解清楚的现象直观地展现在学生面前,对学生力学分析的基本技能和计算机操作与软件应用能力的提高起到一定的作用。     

光——现代"物理学之后"的黑暗

本文通过对量子力学和相对论中相关光的问题的分析,认为正是量子力学和相对论中对光理解的错误导致了今天的物理学和哲学的相关错误。     

警惕青少年运动性骨折的潜在风险性

青少年运动性骨折是体育运动中经常发生的损伤症状。在运动实践中,人们往往把运动性骨折归结为外因——外力作用和内因——骨骼劳损作用的结果。而实际上,青少年运动性骨折还存在一个潜在的风险性原因——青少年骨质疏松症。本文通过对青少年运动性骨折及青少年骨质疏松的论述,旨在引起人们正确分析青少年运动性骨折的内在原发原因,以加强对青少年骨质疏松症的诊断和预防。     

Understanding key performance indicators for breast support: An analysis of breast support effects on biomechanical,physiological and subjective measures during running

To assess the effectiveness of breast support previous studies monitored breast kinematics and kinetics, subjective feedback, muscle activity (EMG), ground reaction forces (GRFs) and physiological measures in isolation. Comparing these variables within one study will establish the key performance variables that distinguish between breast supports during activities such as running. This study investigates the effects of changes in breast support on biomechanical, physiological and subjective measures during running. Ten females (34D) ran for 10 min in high and low breast supports, and for 2 min bare breasted (2.8 m·s^?1). Breast and body kinematics, EMG, expired air and heart rate were recorded. GRFs were recorded during 10 m overground runs (2.8 m·s^?1) and subjective feedback obtained after each condition. Of the 62 variables measured, 22 kinematic and subjective variables were influenced by changes in breast support. Willingness to exercise, time lag and superio-inferior breast velocity were most affected. GRFs, EMG and physiological variables were unaffected by breast support changes during running. Breast displacement reduction, although previously advocated, was not the most sensitive variable to breast support changes during running. Instead breast support products should be assessed using a battery of performance indicators, including the key kinematic and subjective variables identified here.     

核酸四碱基体及四螺旋模型的理论构建

核酸的结构具有多态性 ,核酸的功能取决于其结构 .了解核酸不同结构的特征有利于对其功能的充分认识 .本文对核酸四碱基体及其形成的四链结构模型进行了理论研究 .这些工作有助于从理论上进一步研究核酸四螺旋结构 ,对相关的实验研究也将起到有益参考作用 .     

Maxwell-Boltzmann统计和气体的热容

本文应用Maxwell-Boltzmann统计分布系统地讨论了气体的热容,且对工科院校教材中有关气体热容的经典理论与实验不相符合的问题用量子论作了理论研究和讨论,作出了合理的解释。     

国产气垫夹板治疗踝关节损伤的临床观察

运用国产气垫夹板对37例急性踝关节损伤进行了治疗效果的观察和分析。结果证实:国产气垫夹板对踝关节扭伤后所致的韧带损伤和稳定性骨折均有明显的治疗作用;踝关节气垫夹板固定时间相对较短,韧带拉伤平均18天,稳定性骨折平均31天;国产气垫夹板限制踝关节内翻和外翻,但不影响踝关节的背伸和跖屈运动,患者可进行早期关节活动。