凹的

The results show that, when the fuel supply position is located at the forebody of cavity, the jet flow of fuel supply has certain damage to vortex, and when the fuel supply injection is located at the afterbody of cavity, the jet flow of fuel supply has no damage to vortex.

实验表明，供油位置在凹腔前体，油气掺混孔处的射流对涡有破坏，供油位置在凹腔后体，油气掺混孔处射流对涡没有破坏作用，在不考虑供油方式等因素的情况下，凹腔后体供油优于凹腔前体供油。

Consider the circle that is tangent to the curve at and has the same curvature there. Its center will lie on the concave side of the curve. This circle is called the circle of curvature. Its radius is the radius of curvature, and

在点处的曲线的法线上，在凹的一侧取一点，使得，以为圆心，半径为的圆叫做曲线在点处的曲率圆，曲率圆的圆心叫做曲线在点处的曲率中心，曲率圆的半径叫做曲线在点处的曲率半径。

Researches show that the drive force characteristics of the electric tractor drive system based on series DC motor is close the ideal characteristics, the curves are concave, low speed with constant power, and high speed with constant torque; the electric tractor has large working speed under different shifts, but the extensive coincidence speed shows that the variable ratio of the gear is unreasonable; the maximum climbable gradient of this electric tractor is more than 30%, and does not need frequent shift when working for its extensive climbable gradient; there are many influence factors of continuous working time, which the more obvious factors are working speed and working load, the working time increases with the increase of the working speed and working load.2. Simulation researches on the drive characteristic of the electric tractor.

研究结果表明：基于串励直流电动机(来源：ABC21论文网www.abclunwen.com)的电动拖拉机电驱动系统的驱动力特性场接近理想驱动力特性场，其各挡下的驱动力特性是一组下凹的曲线，低速恒转矩，高速恒功率；同一行驶速度下所对应高挡驱动力大于低挡驱动力，这是由电机的调速特性决定的；电动拖拉机各个挡位下具有较广的稳定作业速度范围，但是各个挡位之间速度重合的范围较多，说明所用变速箱变速比与电动机匹配不合理；电动拖拉机最大爬坡度达到30%以上，并且各挡爬坡度变化范围较广，作业过程中不需要频繁换挡；影响电动拖拉机连续作业时间的因素较多，其中作业行驶速度和作业负荷影响最为明显，作业负荷越大，连续作业时间就越短，作业速度越快，连续作业时间就越短。2、电动拖拉机驱动特性仿真研究。

Two He-Ne lasers have been designed in experiment,one with simplest 2D axisymmetric folded-combined cavity that are composed of a concave-plano-concave folded cavity and a plano-concave cavity , and other with simplest 3D axisymmetric folded-combined cavity that are composed of two concave-plano-concave folded cavities and a plano-concave cavity.

本文实验设计了由一个凹-平-凹折迭腔与一个平凹腔组合的二维轴对称折迭-组合腔型He-Ne激光器及由两个凹-平-凹折迭腔与一个平凹腔组合的最简单立体轴对称折迭-组合腔型He-Ne激光器。

With traditional gravure gravure gravure, etching and engraving rotogravure, rotogravure and Handcrafted carved gravure gravure and e-ring.

传统的凹版有雕刻凹版、蚀刻凹版和照相凹版，其中雕刻凹版又包括手工雕刻凹版和电子圈刻凹版。

The 3 kinds of concave earthquake precursors in seismogenic process-vector, stress and telluric current concavity are summarized.

总结了反映孕震过程的矢量凹形、应力凹形、地电凹形等3种凹形震兆，阐述了水汞、水氡突跳，形变相关系数和地磁最大相关系数等前兆图像及其预报作用。

The purpose of this thesis is to use finite element software ANSYS to analyze the mechanical behavior of thin-walled SUS304 stainless steel tubes with elliptic-notched subjected to curvature-controlled symmetric cyclic bending. The mechanical behavior contains the relationship among curvature, bending moment and ovalization. There are two kinds of the elliptic-notch.

本研究是以有限元素分析软体ANSYS 分析SUS304 不锈钢椭圆形凹槽薄壁圆管承受对称曲度循环弯曲负载下的力学行为，其中力学行为包含有曲度、弯矩及椭圆化的相互关系，而椭圆凹槽分为两种，一种为固定凹槽的深度，并改变凹槽的宽度；另一种为固定凹槽的宽度，并改变凹槽的深度。

In this paper an innovative method for machining sculptured surfaces is presented. By using a disc cutter with a concave end instead of traditional ball-ended or drum-shaped tools, and adjusting the cut- ted axis to swing relative to the component being machined under some special rules, the envelope formed by the trace of the tool-nose may have the same derivative up to the third order as the required theoretical surface.

本文提出了一种加工自由曲面的新方法，即采用中凹的盘形铣刀取代传统的球头或鼓形铣刀，在每一行程中让刀具轴线相对于工件按特定的规律摆动，使得在垂直于进给方向的法截面中，由刀尖轨迹形成的包络面与理论曲面的法截线具有相同的1～3阶导数，从而在保持精度不变的前提下，使实际行程次数得以大幅度的减少。

By means of using a disc cutter with a concave end instead of traditional ball-ended or flat-ended ones,and adjusting the cutter axis to move relatively to the component being machined according to some special rules,the envelop formed by the trace of the tool-nose in each pass and the required surface have the same derivatives up to the second order in the plane normal to the feeding direction.

采用二阶密切曲率法，即采用中凹的盘形铣刀取代传统的球头或鼓形铣刀，在每一行程中让刀具轴线相对于工件按特定的规律摆动，使得在垂直于进给方向的法截面中，由刀尖轨迹形成的包络面与理论曲面的法截线具有相同的1阶？

By looking at the individual elements in any given backbend—such as examining the direction of movement of the shoulders,删 arms,凹 torso,凨 hips and legs—we can deconstruct the posture and aligning,凟 strengthening and opening these individual regions to more refined by identifying particular areas of interest need in our students' bodies and focusing on these areas in class,凝 I call this "progressive sequencing" and it is different from "pose/ counter pose " sequencing.

通过关注每个后弯体式中独立的元素——例如检查肩膀、手臂、躯干、髋以及两腿的运动趋势——我们能够通过分解的方式来探究体式和学习校准；通过了解学生的身体中需要深化和发掘的独立的区域，凨强化并打开这些独立的区域，凣并且能够在课堂中专注于这些区域，凡我把这个叫做&渐进序列&，凷这与&体式/反体式&序列是不同的。凯

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。