查询词典 valve

Methods The tricuspid valve function was evaluated by Doppler echocardiography in 903 patients who underwent mitral valve replacement during recent 10 years.

对接受二尖瓣置换术的903例病人术后三尖瓣功能进行了2～9年，平均（3.6 2.4）年的跟踪观察。

Intraoperative occlusion did not affect the aortic valve and tricuspid valve function.

术中堵闭后均未影响主动脉瓣及三尖瓣的功能。

Background: The choice of a bioprosthetic vs a mechanical valve in tricuspid valve replacement continues to be debated.

背景： 三尖瓣置换术应采用生物瓣膜抑或机械瓣膜的问题尚有争议。

The location and the influence of the implanted device on function of tricuspid valve and mitral valve were evaluated by echocardiography.

用心脏超声观察封堵器位置及封堵器对右、左房室瓣功能的影响。

Methods We examinated 880 patients with heart murmur,viewed shape、size and movement of mitral valve and tricuspid valve,and hemodynamic variation.

利用二维及彩色多普勒技术观察880例有心脏杂音患者的二、三尖瓣的形态、大小、活动及血流动力学变化。

KEY WORDS］rheumatic heart disease; tricuspid valve disease; valvuloplasty; valve replacement

关键词］风湿性心脏病；三尖瓣病变；瓣膜成形术；瓣膜置换术

Results Mitral valve and tricuspid valve prolapse were classed three grades.

结果 二、三尖瓣脱垂分为三级。

A triple purpose product featuring a toilet tank ball cock fill valve, anti-siphon backflow preventer, and a thermal expansion relief valve.

一种三用产品，具有马桶水箱浮球注水阀，反虹吸防回流阀，和热膨胀安全阀。

As the complete characteristic curves of reversible pump turbine are often used to calculate the instantaneous parameters, this paper studies the characteristic curve and the wicket closure and opening law in pumped storage plants.Chapter 1 presents the importance and the necessity of this study and reviews the previous related research on hydraulic transient process and valve regulation in pumped storage plants.Chapter 2 analyzes the six collected characteristic curves of reversible pumped turbine and studies their diversification from the point of view of specific speed. The six collected discharge and moment curves with maximum efficiency have been fitted to piecewise continuous curves. This curve-fitting procedure is listed.Chapter 3 takes Liyang Pumped storage plant as an example and analyzes the effect of different characteristic curves on regulation guarantee parameters and the variety of its trochoid during the same operation status.Chapter 4 takes three pumped storage plants with different heads as examples and studies the characteristic of coordinated closure with wicket gate and ball valve and its effect on dynamic pressure in the spiral case, inlet pressure in the draft tube and the rise of rotating speed.Chapter 5 summarizes this paper and point out what should be done in the future research.

由于在过渡过程分析计算中，需要频繁利用可逆式机组的全特性曲线推求机组的瞬时参数，所以本文就特性曲线及关闭规律问题进行了研究，其主要内容如下：第1章，指出本文研究的意义和目的，回顾前人对水力过渡过程、抽水蓄能电站及阀调节的研究成果，在此基础上提出本文的研究内容；第2章，针对收集到的六套特性曲线，从比转速的角度出发来研究可逆式机组特性曲线的变化规律；并对六套曲线的最高效率流量和力矩曲线进行分段拟合，得到各分段函数的具体形式，再通过举例说明最高效率曲线的拟合步骤；第3章，以溧阳抽水蓄能电站为实例，分析讨论不同比转速特性曲线对调保参数造成的影响及对于相同工况其轨迹线的变化；第4章，结合高、中、低三水头段抽水蓄能电站，在导叶直线关闭的基础上，研究导叶与球阀协联关闭规律的特点及对蜗壳动水压力、尾水管进口压力及转速上升造成的影响；第5章，总结全文，提出今后研究的重点和方向。

By means of a 1/17 scale hydraulic model of the lock culvert valve of the TGP, the valve trunnion load s were measured and their fluctuation values and characteristics were analyzed.

通过几何比尺17的阀门段水力学模型试验，测量了在阀门运行过程中三峡船闸输水阀门支铰荷载，并分析了其脉动量的数值及频率特性。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷