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关于培养体弱学生锻炼兴趣的实践与思考
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作者 杨灵群 《中国科技经济新闻数据库 教育》 2017年第2期209-209,共1页
在体育课教学中,常有一些体弱的学生,他们因为身体素质差、运动水平低而产生不同程度的自卑感,对体育课不感兴趣,上课时积极性不高。针对这个问题我们提出了有效的措施,即热爱尊重学生、参与学生练习过程、降低评价标准、教学形式多样... 在体育课教学中,常有一些体弱的学生,他们因为身体素质差、运动水平低而产生不同程度的自卑感,对体育课不感兴趣,上课时积极性不高。针对这个问题我们提出了有效的措施,即热爱尊重学生、参与学生练习过程、降低评价标准、教学形式多样化等。通过实践操作有效地培养了这些学生的锻炼兴趣,从而养成学生良好的体育锻炼习惯。同时我们也感到:培养体弱学生体育锻炼的兴趣、爱好与习惯,不仅是一般的体育教育过程,需要一个长期努力的过程,教师要把体弱学生的运动兴趣转化为学生的自觉自愿的运动习惯。 展开更多
关键词 体弱学 锻炼兴趣 锻炼习惯
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Non-Newtionian Effects on Chaotic Mixing Between Eccentric Cylinders 被引量:1
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作者 范毓润 卢著敏 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2001年第3期306-309,共4页
Effect of fluid elasticity and shear-thinning viscosity on the chaotic mixing between two alternately rotating cylinders has been studied. The h-p finite element method is used to obtain high accurate solutions of the... Effect of fluid elasticity and shear-thinning viscosity on the chaotic mixing between two alternately rotating cylinders has been studied. The h-p finite element method is used to obtain high accurate solutions of the steady flow. The unsteady, periodic flow is simulated using the piecewise-steady approximation. Characteristics of the chaotic mixing are analyzed by examining the asymptotic coverage of a passive tracer and the lineal stretching of the fluid elements in the annulus. For the viscoelastic fluids modeled by the upper-convected Maxwell constitutive equation (UCM), our computation predicts little effect of the fluid elasticity on the mixing patterns. On the other hand, the shear-thinning viscosity, modeled by the Carreau equation, has a large impact on the advection of a passive tracer and the distribution of lineal stretching. We find that the zones of the lowest stretching match remarkably well with the regular zones in the tracer-coverage plotting. Our study reveals the vital importance of reducing the discretization errors of the velocity field in the numerical simulation of chaotic flews. 展开更多
关键词 chaotic mixing VISCOELASTICITY shear-thinning viscosity
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A new scheme for identifying free surface particles in improved SPH 被引量:6
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作者 ZHENG Xing DUAN WenYang MA QingWei 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第8期1454-1463,共10页
The present paper proposes a new scheme for identifying free surface particles in an improved SPH (Smoothed Particle Hydrodynamics). With the development of the SPH, free surface identification becomes a key challenge... The present paper proposes a new scheme for identifying free surface particles in an improved SPH (Smoothed Particle Hydrodynamics). With the development of the SPH, free surface identification becomes a key challenge in free surface flow simulations, especially for violent breaking water waves. According to numerical tests, existing free surface identified schemes are not reliable for weakly compressible SPH when violent waves are modeled. The new free surface identification scheme suggested here considers changes in density ratio and three auxiliary functions. Although this new scheme originates from a scheme for another meshfree method (MLPG_R method), it includes several improvements, especially developed for the improved SPH. The limited numerical tests have indicated that the scheme does not significantly increase CPU time required, but it considerably improves the identification of free surface particles. 展开更多
关键词 meshfree method SPH free surface identification scheme improved SPH
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Review of cavity optomechanics in the weak-coupling regime: from linearization to intrinsic nonlinear interactions 被引量:6
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作者 XIONG Hao SI LiuGang +2 位作者 LV XinYou YANG XiaoXue WU Ying 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第5期16-28,共13页
Recently, cavity optomechanics has become a rapidly developing research field exploring the coupling between the optical field and mechanical oscillation. Cavity optomechanical systems were predicted to exhibit rich a... Recently, cavity optomechanics has become a rapidly developing research field exploring the coupling between the optical field and mechanical oscillation. Cavity optomechanical systems were predicted to exhibit rich and nontrivial effects due to the nonlinear optomechanical interaction. However, most progress during the past years have focused on the linearization of the optomechanical interaction, which ignored the intrinsic nonlinear nature of the optomechanical coupling. Exploring nonlinear optomechanical interaction is of growing interest in both classical and quantum mechanisms, and nonlinear optomechanical interaction has emerged as an important new frontier in cavity optomechanics. It enables many applications ranging from single-photon sources to generation of nonclassical states. Here, we give a brief review of these developments and discuss some of the current challenges in this field. 展开更多
关键词 cavity optomechanics nonlinear interactions weak-coupling regime radiation pressure
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