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981.
庄培章 《闽西职业技术学院学报》2005,7(4):8-9
根据马克思主义关于社会动力论的基本思想,提出中国现代化动力系统结构的四个层次,并对每一层次的功能进行分析。 相似文献
982.
陈永莉 《玉溪师范学院学报》2007,23(11):86-90
先秦至南北朝时期,汉语的动宾语序有一个由前置逐渐后移的演变过程,用定量研究的方法可以科学地揭示其演变的动因,即:代词的高"有定性"是其前置的原因、语言类推力的作用使前置宾语后移、焦点标记是前置宾语后移的语用动力。 相似文献
983.
网络技术创新的非线性动力学分析 总被引:2,自引:0,他引:2
网络技术创新是一个系统演变的进性过程。本文运用非线性动力学的研究方法 ,对这一过程作了初步分析 相似文献
984.
This bungee jumping model improves the stretch prediction accuracy of prior models by including the effects of: rubber viscoelasticity,
stiffness nonlinearities, jumper air drag, and jumper horizontal push-off. Bungee (bungy) cords are made from rubber, a viscoelastic
material whose stiffness is a function of the number of cycles (cycle effect), the time interval since the last cycle (interval
effect), strain rate, and temperature. Stiffness was measured, on an MTS machine, over 100 cycles at four intervals (1, 5,
60, 1440 min), three strain rates (0.17, 1.5, 5.0 s−1) and constant temperature (20.5°C). At a constant cycle interval and strain rate, rubber stiffness decreased 9.8% from the
10th to the 100th cycle. This decrease was linear with the logarithm of the cycle number. Stiffness recovered 6.5% after 24
hours of non-use. Neglecting viscoelastic effects causes significant stretch-prediction errors of -11.0% (cycle effect), -3.2%
(interval effect), and +1.6% (strain rate). Less significantly, neglecting jumper air drag, jumper push-off, and stress-strain
nonlinearities cause prediction errors of +1.9%, +0.7%, and +0.2%, respectively. These errors are based on a typical cord,
of unstretched length 7.5 m, that elongates 250%. For accurate stretch prediction, with typical sized bungee cords, viscoelastic
effects are both more important and easier to implement than air drag and stress-strain non-linearity. 相似文献
985.
Study on power systemchaotic phenomena is oneimportant aspect in power system stability stu-dies[1—3]. Early studies, such as Lee[4], Chiang[5],Wang[6]and Tan[7], mainly focused on interpretingthe behavior of chaotic oscillations. Later researches,such as Wu[8], Rajesh[9], Jia[10,11], Srivastava[12]and Abed[13]began to concern the following topics,such as interaction of chaotic motion and system dy-namics, the relationship of power system stability re-gion and chaos, and the methods to eli… 相似文献
986.
Vershueren认为,语言使用实际上是人们不断地对语言做出选择的过程,语言选择有很多特点并且发生在语言的各个层面。顺应性使人们通过协商,最终达到理想的交际目的。因此无论英语习得及教学都要不可避免的遵循这些选择,更重要的是要顺应。 相似文献
987.
The aim of this study was to investigate effects of speed and plane of motion on stability during locomotion in skilled football players. Ten male national-level football players participated in this study to run forward, backward and in lateral directions on a treadmill at 80%, 100% and 120% of their preferred running speeds. The coordinate data of passive reflective markers attached to body segments were recorded using motion capture systems. Time series data obtained from the ankle marker were used for further analyses. The largest finite-time Lyapunov exponent and maximum Floquet multiplier were adopted to quantify local and orbital dynamic stabilities, respectively. Results showed that speed did not significantly change local and orbital dynamic stabilities in any of running patterns. However, both local and orbital dynamic stability were significantly higher in the secondary plane of progression. Data revealed that in running, unlike walking, stability in the direction perpendicular to the direction of running is significantly higher, implying that less active control is required in the secondary plane of progression. The results of this study could be useful in sports training and rehabilitation programmes where development of fundamental exercise programmes that challenge both speed and the ability to maintain stability might produce a tangible enhancement of athletic skill level. 相似文献
988.
989.
Yoichi Iino Takeji Kojima 《Sports biomechanics / International Society of Biomechanics in Sports》2016,15(2):180-197
The ability to generate a high racket speed and a large amount of racket kinetic energy on impact is important for table tennis players. The purpose of this study was to understand how mechanical energy is generated and transferred in the racket arm during table tennis backhands. Ten male advanced right-handed table tennis players hit topspin backhands against pre-impact topspin and backspin balls. The joint kinetics at the shoulder, elbow and wrist of the racket arm was determined using inverse dynamics. A majority of the mechanical energy of the racket arm acquired during forward swing (65 and 77% against topspin and backspin, respectively) was due to energy transfer from the trunk. Energy transfer by the shoulder joint force in the vertical direction was the largest contributor to the mechanical energy of the racket arm against both spins and was greater against backspin than against topspin (34 and 28%, respectively). The shoulder joint force directed to the right, which peaked just before impact, transferred additional energy to the racket. Our results suggest that the upward thrust of the shoulder and the late timing of the axial rotation of the upper trunk are important for an effective topspin backhand. 相似文献
990.
Molecular dynamics simulation was carried out to study the behavior of liquid 1,2-dichloroethane molecules under external
electric fields including direct current field, alternating current field and positive-half-period cosin field. The maximum
applied field strength was 108 V/m, the maximum frequency of the alternating current field and that of the positive-half-period cosine field was 1012 Hz. The simulation revealed that the field type and field strength act on the population of the molecular configuration.
In the strong direct current field, all trans forms converted completely into gauche forms. Order parameter and the correlation
of the system torsion angle were also investigated. The results suggested that these two dynamical parameters depended also
on the field type and the field strength. The maximum of order parameter was found to be at 0.6 in the strong direct current
field. 相似文献