When a swimmer slows and then finally applies forces there are stages of slowing down ( the correct term is negative acceleration not deceleration ) and speeding up ( the correct term is positive acceleration not acceleration ) 当游泳运动员慢下来然后增加力量以求得继续前进时会有不同的阶段,这就是减速阶段(正确用语是负加速度而非减速)和加速阶段(正确用语是正加速度而非加速) 。
In modern market economy , banking and finance is becoming more and more important . financial innovation , with its great - applied force , infiltration and driving force , has been an important factor and a major herald to the economic development <中文摘要> =在现代市场经济中,金融的地位越来越突出,金融创新也已成为经济发展的重要因素和先导力量,具有强大的作用力、渗透力和推动力。
The stochastic structure and stochastic intelligent truss structure are taken as research object in this paper . the analytical model and method of the structural dynamic characteristic are investigated . when the applied forces are random excitation or random process ( stationary random process or non - stationary random process ) excitation , the structural dynamic response , the active vibration control for the intelligent structure , the optimal placement of the sensor and the actuator and the optimization of the feedback gains of the closed loop control system for the intelligent structure , and the effects of the structural parameters on the active vibration control et al are all studied systemically 本文以随机结构和随机智能桁架结构为对象,对结构动力特性分析模型与求解方法进行了研究;对结构在随机力或随机过程(平稳随机过程或非平稳随机过程)激励下,结构的动力响应、结构的振动主动控制、智能结构中作动和传感元件配置位置与闭环控制系统增益优化、结构参数对振动主动控制效果的影响等问题开展了全面而系统的研究。
At the last of this paper , we summarized the deficiencies of simulating pre - stressing anchor and proposed the new and accurate simulating method which is given up the traditional tow points applied forces and applied a point reverse forces , made beam element simulate the anchor bolt , made interface element simulate concrete . in addition , we proposed two simulating methods applied on flock anchors which improved on considering the contribution of anchors " tangent - orientation stiff . one is post - stressing offset method ; the other is anchor element method 另外,本文还提出了两种改进原有群锚模拟中没有考虑锚索限制变形的侧向刚度贡献的方法,即后续张拉补偿法和锚索单元法,通过平面直线型滑动破坏中这两种方法与传统群锚的两点集中力法的比较、分析,表明这两种方法的结果与实际情况较为相符。
People has known that the mechanical stress influence botanic growth long before . the previous works shown that a series of complex physiological and chemical responses are brought in inside of organism by external forces . the complex physiological and chemical responses depend on the type and the strength of the applied forces 很早以前,人们就认识到机械力的作用对植物生长能产生明显的影响,诸多学者对机械应力刺激的研究结果表明,机械力的刺激在生物内部会产生一系列的复杂生理和化学响应;并且这些响应的强弱与外界机械刺激力的大小和类型有密切的关系。