To observe influence of respiration on hemodynamics and interventricular septal ( ivs ) motion in patients with pericardial effusion ( pe ) with echocardiography and to provide theoretical basis for its clinical application 观察心包积液患者胸压变化时心内各瓣口血流速度变化及室间隔运动情况，为临床无创定量心包填塞严重程度提供依据； 4
2 . respiratory variation index ( rvi ) in normal man pulsed - wave doppler spectra of the four cardiac valves were recorded and compared with sequoia 512 and acuson 128 xp / 10 in 79 normal subjects aged 18 to 70 years 正常人rvi值范围的测定79名健康志愿者，采用sequoia512和acuson128xp 10彩色电脑声像仪，记录各瓣口血流速度、同步心电图和呼吸曲线。
Methods : in 45 cases ( 50 lower limbs ) with differernt clinical stages of venous incompetence of lower extremities , the number , diameter and blood flow velocity of pvs were examined by color doppler ultrasound 方法：用彩色多普勒超声检查下肢静脉功能不全患者45例50条下肢的小腿交通静脉的数目、部位、内径及血流速度，并分别与患者的临床表现分级进行相关性分析。
A cascaded architecture is adopted , where desired propeller rate of revolution is generated by solving a static 2nd order equation with a parameter of desired thrust force , which is the input of the speed / position tracking control 在推进器动态模型的基础上，采用滑模控制的方法，由速度位置误差获得期望推力，再通过求解包括来流速度的二次方程得到期望螺旋桨转速。
Conclusion : in conclusion , af adversely affects cerebral circulation leading to hemodynamic blood flow disturbances that might result in changes in mv values of the mcas but which are usually insufficient to develop clinical symptoms of brain ischemia 结论：心房纤颤可改变大脑中动脉的平均血流速度，对脑部的血流动力学产生不良影响，但还不足以产生脑缺血的临床症状。
Result of numerical simulation analyses powder grain size influence to velocity and temperature of flame , repeat with different grain size parameter simulation calculate , it has important meaning to accelerate and heat performance of spraying powder 根据数值模拟结果分析了粉末粒度对火焰焰流速度和温度的影响，用不同粒度参数重复模拟计算，这对喷涂粉末的加速和加热性能具有重要意义。
At large attack angle the frequency of the vortex has n ' t a apparent zone of " lock - in " . the fluid - induced vibration at large attack angle belongs to the stable dynamic response problems . but a sudden skip of amplitude will occur at large inlet velocity 在大攻角下分离涡脱落的频率没有一个明显的频率锁定区域，流体振动属于稳定的动力响应问题，但在大来流速度下会出现振幅突跳的现象。
This model not only can calculate the critical pressure , critical crossflow velocity of critical point and critical layer thickness , but also can predict the relationship between the nature of the critical point and different kinds of operation parameters 用该模型不仅能计算错流微滤过程中临界点的临界压力、临界错流速度和临界滤饼层厚度，还可以对临界点的性质与微滤中各项参数的关系进行预测。
The influence of inflow velocity , the baffle body height and the clapboard position on the flow velocity , flow equilibrium between the two sides of the clapboard , particle distribution , rich / lean concentration ratio and flow resistance characteristic are studied numerically 文章研究了来流速度，撞击块高度、隔板位置等因素对气相速度场、隔板两侧配风均匀性、颗粒浓度、浓淡分离比和燃烧器内阻力特性的影响。
As a general rule , an adequately sized globe valve ( i . e . with pipe velocity between 15 to 25 ft / sec for water and 200 to 300 ft / sec for steam ) should not be throttled down below 35 % of its maximum full open cv capacity ( approximately 20 % of full stroke ) 一般而言，通径足够大的截止阀（例如管道内水流速度在15至25英尺/秒之间，蒸汽流速在200至300英尺/秒之间） ，节流后的流量不应该小于完全开启状态流量（流量系数大约为全冲程的20 % ）的35 %以下。
