查询词典 notching curve

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。

Based on the analysis of the predicted results of hyperbolic curve model and exponent curve model, the Gray TVP Model gains an advantage over them two in prediction precision and time effect.

利用双曲线模型和指数曲线模型对典型断面进行了沉降预测，三种模型预测结果的对比突出了灰色时变参数模型的准确性和时效性。

Through establishing frame-shear wall structure unisonous differential eguation and finding a result,the side shifting curve,moment and shear force distribution curve are obtained under inverted triangle load action onthe frame-shear wall structure.After analyzing and comparing,the range of best rigid characteristics for such structure has be gotten.

通过建立框-剪结构协同工作的微分方程及求解，得出框-剪结构在倒三角形荷载作用下的侧移曲线、弯矩、剪力分布曲线，经分析对比，得出框-剪结构最佳刚度特征值区间。

Design of pitch curve of a VCD—NGPM with circular planetary gear has been done, and a universal program for designing pitch curve is drawn up.

1首次提出变中心距非圆行星齿轮机构的概念，给出其节曲线设计步骤和相应的计算公式。

The study of the effect of Glycerol on survival of the E.coli shew Glycerol could protect E.coli and improve dry, vacuum and implantational survival rate during ion beam implanting the E.coli. The whole survival rate of protected the E.coli implanted by 30keV N+ was 530-10000 times higher than unprotect ones. Glycerol changed bacteria outer color and survival rate curve. At the same doses, the color of the E.coli protected by five and one percent Glycerol was white or yellow, lighter than unprotected. In addition, the survival rate curve of the E.coli with Glycerol located above one without Glycerol, and the peak of which was higher and delayed at dose.

在研究甘油对低能离子注入E.coli存活的影响时，发现甘油保护可以提高E.coli的干燥存活率，真空存活率以及注入存活率，使得整个30keY氮离子注入后E.coli的最终存活率提高530-10000倍；甘油保护引起离子注入后的菌体颜色发生变化，在相同的剂量下，未用甘油保护的菌体颜色最深，1％甘油保护菌体颜色次之，5％甘油保护菌体颜色最浅；另外，甘油可以引起离子注入E.coli的"马鞍型"存活率曲线发生变化，甘油保护的E.coli存活曲线大致位于未用甘油保护的存活曲线的上面。

The pressure derivative curve will upwarp because of the existence of the threshold pressure gradient and the fault. The identification of the type of "upwarping" in the pressure derivative curve is crucial to the selection of the well testing model.

启动压力梯度和断层的存在都会使压力导数曲线发生"上翘"，对压力导数曲线"上翘"类型的识别，是正确选择试井解释模型的关键。

Based on traditional method of image segmentation with the biggest variance ratio , a new method is proposed for image segmentation of front magnetic curve by taking front magnetic curve obtained from an oilfield for example.

在经典的最大方差比图像分割算法的基础上，以油田前磁曲线图像为例，提出一种新的适应于前磁曲线图像分割方法。

The results showed that both the break point on the Ia-c curve and the minimum of the derivative variation corresponding to the λa-c curve agreed very well with the critical micelle concentration of the surfactant in aqueous solution as measured by surface tension technique.

以对二甲氨基苯甲腈为探针，测定它在表面活性剂(C12TABr、SDS、C12E23、C12-3-12·2Br)水溶液中的第二重荧光强度和对应的特征波长对表面活性剂浓度曲线，由Ia-c 曲线的转折点或λa-c曲线对应的一阶导数极小点可以获得临界胶团浓度。

The result shows that the curve of viscous resistance coefficients calculated lies close to the curve of experiment values reckoned from the form factor (1+k),as values of wave pattern measurement and wave pattern analysis.

计算结果表明：粘性阻力系数计算值和由船模试验（1＋k）值及波形测量与波形分析计算得到的粘性阻力系数比较接近。

In order to choose moving curve of cam follower and raise the speed of warp knitting machines, this study applies the method of fuzzy comprehensive assessment to the choice of cam moving curve.

为选择优良的经编机凸轮从动件运动曲线，提高国产凸轮在实际生产中的速度，将模糊综合评价方法应用到经编机凸轮运动规律的选择中。

We got alerted a couple of times while we were down south that HETs were on the way to bring us back up north because things were going to go hot again, but it was just rumors.

南下的途中我们不只一次得到警告说重型装备运输车将拉着我们重新北上，因为局势正在变得重新紧张起来，但这只是谣传。

It's the one where they find the ghost in the salt mine.

这一集是演他们在盐矿找到鬼