【摘 要】
:
The study on the controllability of system has grown mature since Karman. The concepts and criteria of controllability can be directly applied to the vibration
【机 构】
:
Department of Mechanics, Peking University, Beijing 100871, China,Department of Mechanics, Peking Un
【出 处】
:
Chinese Science Bulletin
论文部分内容阅读
The study on the controllability of system has grown mature since Karman. The concepts and criteria of controllability can be directly applied to the vibration control of flexible structures. At present, while the space structures are designed to have larger size and more flexibility, their movement shows clear evidence of wave propagation in many cases. Therefore, the study of wave control has aroused more and more attention.
The study on the controllability of system has grown mature since Karman. The concepts and criteria of controllability can be directly applied to the vibration control of flexible structures. At present, while the space structures are designed to have larger size and more flexibility, their movement shows clear evidence of wave propagation in many cases. Therefore, the study of wave control has aroused more and more attention.
其他文献
清代康熙年间,桐城的张英在京做官.家人建房时与邻居发生争执,彼此为三尺宅基地互不相让,家人送信给张英,盼望他给做主.张英见家书后,复诗一首寄回:千里捎书为一墙,让他三尺
最近经常有人指责电视,我觉得中国的电视在当代的发展极为健康,极为正常,对中国的文化建设作出了第一位的贡献。当然也存在着一些问题,我们要意識到,而且要用创造去使存在的问题得以改变。浙江卫视的《人文深呼吸》,很多观众都说在那么多黄金时间节目中,完全做文化类的节目不多了,而且周日晚上黄金时段做文化类节目,你们不要收视率了吗?其实,这是我们多年来的坚持。因为在黄金时间出现文化类的节目,有一段时间确实影响了
书中滑落一个浅蓝色的信封.无名……rn记忆如铜版画,刻在脑海中,雨季的目光弯弯曲曲,写的满潮湿的感情,年轻的思绪,丝丝缕缕潜入脑海,连自己都琢磨不透,只是多了朦胧、甘甜的
云卷云舒是天空的活力,花落花开是大地的活力,激情四射是我们的活力!“恰同学少年,风华正茂”,热情似火的我们展现着自信的勇气,闪耀着拼搏的光芒,凝聚着友谊的力量.我们用四
目的:已有研究表明表遗传学与胃癌的发生发展密切相关,其中DNA的启动子区高甲基化沉默抑癌基因中起至关重要的作用。本文着重研究EYA4基因在胃癌中的表达水平与DNA启动子区的
各路朋友,老少爷们儿,京剧舞台上,我们一个个长得或黑脸或白脸、或红、或花,怪模怪样,你可认得我们?今儿个,咱就来个自我介绍。我们通名叫脸谱,看其面便可知其人。
All the
三麦杂交育种是利用不同的品种进行交配,动摇它的遗传稳定性,使之发生变异,创造出新品种,杂交分有性杂交和无性杂交两种。将父本的花粉授在母本的柱头上进行有性交配叫做有
窗外是滴滴答答的雨声,窗内是柔柔的,再来一杯热腾腾的茶,便觉是人生一大美事.雨珠拍打窗棂的声音与清脆的钢琴声混杂在一起,轻轻地把我包围.
目的:通过观察分泌型磷脂酶A2(secreted phospholipaseA2,sPLA2)在重症急性胰腺炎(severe acute pancreatitis,SAP)模型大鼠肺组织和肠组织中的变化规律,来探讨重症胰腺炎病情
目的:
人乳头状瘤病毒(HPV)是宫颈癌、头颈部皮肤癌、食道癌等癌症的致病因素。随着口服避孕药的广泛应用以及雌激素替代疗法的使用,雌激素是否会增加雌激素使用者感染HP