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1.
通过对课堂“动”、“静”的梳理与分析,明确在音乐教育中,学生对音乐的感受与体验等内在的“动”态才是十分关键和至关重要的。“内外兼静”、“内静外动”的教学状态应予以扬弃;“而内外兼动”和“内动外静”的课堂教学状态与境界则是应予以提倡和肯定。 相似文献
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锴 《当代教育理论与实践》2014,(3):159-162
目的随着经济的发展,不断增加的繁重交通荷载加剧了桥梁结构的负担,众多桥梁亟待得到结构性能评定,而桥梁荷载试验是评定桥梁结构性能的重要方法。通过数值分析为桥梁检测静荷载试验和动荷载试验提供一种参考凭据,从而更好地对桥梁运行状况作出评定。方法利用桥梁结构分析与计算软件Midas-Civil建立有限元模型,分析桥梁在静荷载作用下的挠度、应力应变等静力特性和在动荷载作用下结构的振动特性。结果对比模拟数据、桥梁检测荷载试验实测数据以及理论计算数据,评定该桥处于良好运营状态。结论基于桥梁结构分析与计算软件MidasCivil仿真模拟为桥梁荷载试验提供一种参考凭据是切实有效可行的方法。 相似文献
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动点问题是近几年中考的热点问题，也是体现学生综合运用知识能力的过程。动点问题是以几何知识和图形为背景，渗入运动变化观点的。类试题，这类题型揭示“运动”与“静止”，“一般”与“特殊”的内在联系，以及在一定条件下可以互相转化的辩证关系。通过点的运动，使图形发生变化，通过建立函数模型和几何计算来解决问题。总体解题思路是化“动”为“静”，关键是将其转化为相对静止的瞬间进行分析。 相似文献
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通过对课堂"动"、"静"的梳理与分析,明确在音乐教育中,学生对音乐的感受与体验等内在的"动"态才是十分关键和至关重要的."内外兼静"、"内静外动"的教学状态应予以扬弃;而"内外兼动"和"内动外静"的课堂教学状态与境界则是应予以提倡和肯定. 相似文献
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初中数学几何中的动点问题是学习的难点;在解决这一问题上,通过化“动”为“静”的方法;“动”探“动”的思维.绝对值是初中数学重要的概念,以绝对值的几何意义为例说明以“动”探“动”的应用. 相似文献
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动与静是事物状态的两个方面，动中有静，静中寓动，它们互相依存，并在一定条件下互相转化．在解题中，既要善于动中觅静，以静制动，也要能够静中思动，以动求静，直至动静结合． 相似文献
10.
颜德馨 《新课程学习(社会综合)》2014,(5):60-60
动以养形静以养神
中国传统养生文化在发展过程中产生了各种不同的学术流派,但就其主要模式则可以分为“清静养生”和“运动养生”两种,动与静,截然相反,欲求长生之道,到底应以静为主,抑或以动为主？历代养生家众说纷纭。余认为动与静是对立统一的两种养生方法,古人早有“动以养形,静以养神”之说,方法虽然不同,但目的则一,均为促进和恢复机体气血流畅和平衡。 相似文献
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刘永丰 《扬州职业大学学报》2004,8(2):24-29
力偶分为静力偶和动力偶。本将静力偶以等值、反向、平行且相距很近的两个力等效代替，用加权残值法给出了静力偶作用下薄板弯曲的挠度计算；用拉格朗El方程建立了动力偶作用下薄板的运动微分方程，并给出其动力响应。 相似文献
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强夯加固效果用单一的检测方法往往难以完全准确判定。利用超重型动力触探、静载荷试验、多道瞬态瑞利测试三种方法,根据试验结果进行对比分析,最后选择多道瞬态瑞利波法可以快速、经济取得全方位的检测效果,为后续及同类工程提供类比经验。 相似文献
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The surface acoustic wave (SAW) propagating in a sample of steel is simulated by using finite element method (FEM). The waves are excited by a load function with propagation properties such as phase velocity dispersion and wide bandwidth. A two-dimensional model consisting of surface defects loaded with a wideband 50-200 MHz and short time 0.1 μs displacement function is investigated in the time and frequency domains. By transient dynamic analysis, Fourier transform and dispersion calculation, snapshots of propagating wave and responses from sensing points are presented. It is indicated that this supervision approach is sensitive to the surface cracks and reflections. 相似文献
14.
To study the bending strength of mass concrete under dynamic loading, the pure bending zone of three-graded concrete beam is considered as a three-phase composite composed of matrix, aggregate and interface between them on meso-level. Dynamic constitutive model considering strain-rate strengthening effect and damage softening effect is adopted to describe the cocrete and meso-element's damage. The failure mechanisms of beam under impact loading, triagle wave load, dynamic load coupling with initial static loading were simulated by using displacement-controlled FEM. Furthermore, stress-strain curve of the specimens and their dynamic bending strength were obtained. The results obtained from numerical simulation agreed well with experimental data. 相似文献
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In this paper, a modeling method for a pantograph-catenary system is put forward to investigate the dynamic contact behavior
in space, taking into consideration of the appearance characteristics of the contact surfaces of the pantograph and catenary.
The dynamic performance of the pantograph-catenary system, including contact forces, accelerations, and the corresponding
spectra, is analyzed. Furthermore, with the modeling method, the influences of contact wire irregularity and the vibration
caused by the front pantograph on the rear pantograph for a pantograph-catenary system with double pantographs are investigated.
The results show that the appearance characteristics of the contact surfaces play an important role in the dynamic contact
behavior. The appearance characteristics should be considered to reasonably evaluate the dynamic performance of the pantograph-catenary
system. 相似文献
16.
根据薄壳非线性动力学理论和拟壳法的思想,给出了扁球面网壳在动、静荷载协同作用下的非线性动力学控制方程.然后利用扁球面网壳的非线性动力学变分方程和协调方程,在夹紧固定的边界条件下,通过Galerkin作用得到一个含二次和三次的非线性动力学微分方程.用Floquet指数方法研究了系统的分岔问题,讨论了平衡点（奇点）邻域的稳定性问题.指出了系统在纯动态作用和在动静荷载协同作用下其平衡位置的变化情况. 相似文献
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球头铣刀铣削过程的物理建模与仿真 总被引：1，自引：0，他引：1
给出了球头铣刀刃线几何模型,采用理论切削力分析与实验-系数识别相结合的方法,建立了新的螺旋刃球头铣刀的铣削力模型;建立了考虑刀杆柔性的球头铣刀铣削振动模型;考虑刀具动态变形和工件表面波纹对切削厚度的再生反馈,建立了球头刀铣削动力学模型,对动态铣削过程进行了仿真,证明离线仿真可以对铣削过程动特性做出准确的预测. 相似文献
18.
长波辐射的计算理论及其在建筑节能设计中的应用 总被引：2，自引：0，他引：2
在建筑物表面的热负荷计算中,地面反射辐射和大气长波辐射是两个影响热负荷平衡的重要因素．在给出地面反射霜射和大气长波辐射在建筑围护结构热负荷中的计算公式基础上,分析了两者在热负荷计算中的重要性,并对长波辐射在建筑节能中的一些应用进行了探讨． 相似文献
19.
In the present paper, a dynamic plastic damage model for concrete has been employed to estimate responses of a reinforced concrete slab subjected to blast loading. The interaction between the blast wave and the concrete slab is considered in 3D simulation. In the first stage, the initial detonation and blast wave propagation is modelled in 2D simulation before the blast wave reaches the concrete slab, then the results obtained from 2D calculation are remapped to a 3D model. The calculated blast load is compared with that obtained from TM5-1300. Numerical results of the concrete slab response are compared with the explosive test carried out- in the Weapons System Division, Defence Science and Technology Organisation, Department of Defence, Australia. 相似文献
20.
ZHOU Xiaoqing HAO Hong KUZNETSOV Valerian A WASCHL John 《天津大学学报(英文版)》2006,12(B09):94-99
In the present paper, a dynamic plastic damage model for concrete has been employed to estimate responses of a reinforced concrete slab subjected to blast loading. The interaction between the blast wave and the concrete slab is considered in 3D simulation. In the first stage, the initial detonation and blast wave propagation is modelled in 2D simulation before the blast wave reaches the concrete slab, then the results obtained from 2D calculation are remapped to a 3D model. The calculated blast load is compared with that obtained from TM5-1300. Numerical results of the concrete slab response are compared with the explosive test carried out-in the Weapons System Division, Defence Science and Technology Organisation, Department of Defence, Australia. 相似文献