抛物线

Introduction 引言 The problems that occur while illuminating shallow offset parabolas, in addition to those related to the efficient use of parabolic generally, are additionally aggravated by the specific geometry of the parabolic mirror itself.

这个问题时常存在于浅照射的偏馈抛物面天线上，除了和抛物面天线的效率有关之外，抛物线反射面本身的具体几何形状又使之更加严重。

The second one: we studied the effect of temperature on performance of LDs. It was found that threshold current increase exponentially, outpower and slope efficiency decrease parabola and exponentially respectively. Coefficient of temperature shift is 0.24/K, whereas characteristic temperature also decrease with rise of temperature.

研究了温度对激光器各参数的影响，随着温度的增加，阈值电流呈指数增加，输出功率和斜率效率分别呈抛物线和指数关系递减，同时特征温度也减少，波长随温度的漂移系数为0.24nm/°C，并且总结了一些温度和结构设计方面的关系。3。

Firstly,through changing the shape of cutter-edge,three-segment parabola was used to substitute for the linear profile, and cutter surface equation was deduced.

首先，通过改变刀具切削刃的形状，以三段抛物线代替齿条的直线齿廓，推导出了刀具齿面方程。

Medium parabolic profile and heavy cutter density provide good penetration rates in medium to hard formations with medium compressive strength and small abrasive layers.

中等抛物线冠部和加密布齿使其在中等抗压强度并含一定研磨性的中至硬地层中获得好的钻速。

Medium parabolic profile and heavy cutter density provide good penetration rates in medium to hard formations with medium compressive strength and small abrasive layers.

中等抛物线冠部和加密布齿使其在中等抗压强度的中到硬地层以及薄研磨性夹层中能有良好的钻进速度。

Blade, large PDC cutter, parabolic profile and deep blade design.

五刀翼，大复合片切削齿，抛物线冠部，深刀翼设计。

Conjugate gradient method, the use of Newtons law or the use of parabolic interpolation.

共轭梯度法，使用牛顿法或者使用抛物线插值法。

First introducing the basic principle and several classical distort of Newtons method.

首先介绍牛顿法的基本原理及几个经典的牛顿法变形，然后系统地对其局部收敛性质进行分析，最后拓展牛顿法所体现的基本思想，改进牛顿法，介绍了割线法，抛物线法，指数迭代法和导数迭代法。

In-situ monitoring gave the following results: 1 a tension stress zone occurred at the bottom of reinforced rock mass which indicated that the role of rock bolting was remarkable; 2 stress concentration at surrounding rock of main shaft was gradually transferred from shaft wall to complete rock mass far from shaft center; 3 vertical displacement was gradually smaller from up to bottom and from center to outside of the reinforced loose rock mass.

首先，建立了主溜井三维有限元计算模型，模拟了主溜井围岩的塌落破坏过程和加固后的加固体的稳定性及变形特性；同时，还采用多点位移计等对加固体的稳定性进行了实地监测。计算结果表明：网棚锚注加固体的纵剖面上的压力和位移规律是①加固体下部局部出现拉应力区，表明锚杆的使用是合理的；②加固体内的应力由塌落中心向周围围岩过渡，应力越来越大，最终将荷载传至围岩中；③从下到上下沉逐渐减小；④从加固体中心到周围下沉位移逐渐减小，且近似一条抛物线。

Results showed that the sediment transportation ratio increased with the discharge of flow increased and changed in parabola form with the slope gradient.

结果表明径流输沙率随径流流量的增加而增加，径流输沙率随坡度呈抛物线形式变化，当坡度在21°~24°之间时输沙率最大；径流剪切力也具有类似变化。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。