广义相对论中带电流体球的两个精确解     

张靖仪 《湖南师范大学教育科学学报》1997,(2)

对应于静止带电球对称分布流体球，本文绘出了一种获得Einstein－Maxwell方程精确解的方法，得出了两个新的精确解．并且比较详尽地讨论了它们的物理性质．  相似文献   

力学原理在太极推手中的运用研究     

毕道远 《德州学院学报》2005,21(6):89-92

阐述了太极推手的劲力学原理,并研究了力学三大要素对太极推手功法的影响,结合实践,较详细的论述了其具体在太极推手中的灵活运用.  相似文献   

毛细现象平衡高度   总被引：3，自引：0，他引：3  

罗湘南 《衡阳师范学院学报》2002,23(3):105-106

介绍了毛细现象产生的机理，并利用静力平衡、热力平衡、能量最小原理三种方法分别求得毛细平衡高度。计算结果表明这三种方法是等效的。  相似文献   

实践能力培养的应用型本科院校材料力学课程教学改革探究     

张李娴  郭红利  刘洪萍  尤芳 《教育教学论坛》2019,(26):86-87

在应用型培养模式下,本科院校只有遵循新课改的教学理念,强化学生实践能力培养,才可保障课堂教学质量。本文首先分析了课程特点,同时阐述了应用型本科院校材料力学课程的教学矛盾与问题,最后总结了实践能力培养的应用型本科院校材料力学课程教学改革的途径。  相似文献   

Running mechanical alterations during repeated treadmill sprints in hot versus hypoxic environments. A pilot study     

Olivier Girard  Franck Brocherie  Jean-Benoit Morin  Grégoire P. Millet 《Journal of sports sciences》2016,34(12):1190-1198

We determined if performance and mechanical running alterations during repeated treadmill sprinting differ between severely hot and hypoxic environments. Six male recreational sportsmen (team- and racket-sport background) performed five 5-s sprints with 25-s recovery on an instrumented treadmill, allowing the continuous (step-by-step) measurement of running kinetics/kinematics and spring-mass characteristics. These were randomly conducted in control (CON; 25°C/45% RH, inspired fraction of oxygen = 20.9%), hot (HOT; 38°C/21% RH, inspired fraction of oxygen = 20.9%; end-exercise core temperature: ~38.6°C) and normobaric hypoxic (HYP, 25°C/45% RH, inspired fraction of oxygen = 13.3%/simulated altitude of ~3600 m; end-exercise pulse oxygen saturation: ~84%) environments. Running distance was lower (P < 0.05) in HOT compared to CON and HYP for the first sprint but larger (P < 0.05) sprint decrement score occurred in HYP versus HOT and CON. Compared to CON, the cumulated distance covered over the five sprints was lower (P < 0.01) in HYP but not in HOT. Irrespective of the environmental condition, significant changes occurred from the first to the fifth sprint repetitions (all three conditions compounded) in selected running kinetics (mean horizontal forces, P < 0.01) or kinematics (contact and swing times, both P < 0.001; step frequency, P < 0.001) and spring-mass characteristics (vertical stiffness, P < 0.001; leg stiffness, P < 0.01). No significant interaction between sprint number and condition was found for any mechanical data. Preliminary evidence indicates that repeated-sprint ability is more impaired in hypoxia than in a hot environment, when compared to a control condition. However, as sprints are repeated, mechanical alterations appear not to be exacerbated in severe (heat, hypoxia) environmental conditions.  相似文献   

Mechanical parameters and flight phase characteristics in aquatic plyometric jumping     

Talin J. Louder  Cade J. Searle  Eadric Bressel 《Sports biomechanics / International Society of Biomechanics in Sports》2016,15(3):342-356

Plyometric jumping is a commonly prescribed method of training focused on the development of reactive strength and high-velocity concentric power. Literature suggests that aquatic plyometric training may be a low-impact, effective supplement to land-based training. The purpose of the present study was to quantify acute, biomechanical characteristics of the take-off and flight phase for plyometric movements performed in the water. Kinetic force platform data from 12 young, male adults were collected for counter-movement jumps performed on land and in water at two different immersion depths. The specificity of jumps between environmental conditions was assessed using kinetic measures, temporal characteristics, and an assessment of the statistical relationship between take-off velocity and time in the air. Greater peak mechanical power was observed for jumps performed in the water, and was influenced by immersion depth. Additionally, the data suggest that, in the water, the statistical relationship between take-off velocity and time in air is quadratic. Results highlight the potential application of aquatic plyometric training as a cross-training tool for improving mechanical power and suggest that water immersion depth and fluid drag play key roles in the specificity of the take-off phase for jumping movements performed in the water.  相似文献   

船舶流体力学优质课程建设的探索与实践     

刘丽丽  曹爱霞  杨春萍 《船舶职业教育》2019,7(4):30-32

船舶流体力学是青岛黄海学院船舶与海洋工程专业的主干课程。通过分析教学现状,明确了优质课程建设的指导思想,结合船舶流体力学课程建设过程中的工作实践,从改革教学内容、丰富教学手段、加强实验教学建设、改革考试形式等方面进行总结,为课程的开设与优化提供一定的参考依据,以期提高船舶流体力学教学水平,解决工程中流体力学的应用问题。  相似文献   

Twin Wells: the reconstruction and re-installation of a multi-media installation with fog and sound elements by Dennis Oppenheim     

Artemis Rüstau  Claire Hoffmann  Kerstin Mürer 《文物保护研究》2016,61(3):327-328

  相似文献   

Heisenberg,matrix mechanics,and the uncertainty principle     

S.?LakshmibalaEmail author 《Resonance》2004,9(8):46-56

Werner Heisenberg was one of the key players in the development of quantum mechanics. Besides enunciating the famous Uncertainty Principle, he was also the principal architect of Matrix Mechanics, one of the two standard formulations of quantum mechanics.  相似文献   

浅谈轴測图在《分析力学》中的应用     

陈明元 《贵州教育学院学报》2007,18(2):55-56,60

在《分析力学》的立体图示中使用斜二等轴測图(简称斜二測),可使立体图示更加准确、完善,教材更完美。  相似文献