查询词典 concave function

This paper also describes the conditions for ensuring two engagement lines with double concave-convex circular arc profile.

讨论了中心距偏差和切深偏差相互补偿问题。文中还讨论了双圆弧齿形保持双啮合线的条件。

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。

This paper proposes an algorithm for union, intersection and trim of the closed region, which is based on convex-concave points.

本文提出了一种基于交点的凹凸性求封闭区域的并、交、差的算法。

A cylinder is a hollow tube with a closed concave base that permits it to stand up right.

钢瓶是中空的管道，封闭的底部是凹入的，这样可以直立起来。

A cylinder is a hollow tube with a closed concave base that permits it to stand upright.

钢瓶是中空的管道，封闭的底部是凹入的，这样可以直立起来。

A cylinder is a hollow tube with a closed concave base that permits the cylinder to stand upright.

钢瓶是中空的管道，封闭的底部是凹入的，这样可以直立起来。

Is a hollow tube with a closed concave base that permits the cylinder to stand upright.

钢瓶（图1）是中空的管道，封闭的底部是凹入的，这样可以直立起来。

Products for the system by cutting a piece of wood, wonderful workmanship excelling nature, the appearance of beautiful, practical, collectors, and ornamental value, good wood products, life up to several centuries-old, high school concave side of the product, not to hurt the coccyx, the role of good health in line with the scientific requirements of the human body posture, suitable for fishing,, travel, especially for the nation sat on the floor required the use of long-term, long-term use can play a role in the health of the waist, are home, meals, entertainment ideal choice for carry.

产品为一块木凿制而成，巧夺天工，外观精美，具有实用、收藏及观赏价值，好木料产品，使用寿命达好几百年之久，该产品边高中凹，不伤尾骨，具有良好的保健作用，符合人体坐姿科学要求，适合垂钓、遛鸟、外出旅行，尤其适合需要长期席地而坐民族使用，长期使用能起到对腰部的保健作用，是家居、外出、休闲娱乐随身携带的理想选择。

Among picosecond fluorescence spectroscopy setup, sample cell, one side is concave, and collimate optics system were designed and made. Which improve fluorescence collect rate 30%, and is key to experiment.

在荧光光谱装置中，设计制作了一侧为凹面的样品盒和准直光学系统，提高荧光的收集效率30%，对实验成功起了关键的作用。

Commissure face of seed deeply concave or sulcate.

果表面瘤状的或具小乳突。

As a dominant party,CPC government should play a guardian,supervisee and guarantee role to overcome all the difficulties in the development of charitable cause and bring it into full play in the establishment of harmonious society on policies and regulations basis.

在中国共产党的文献中第一次把发展慈善事业提到&最广泛最充分地调动一切积极因素，不断提高构建社会主义和谐社会的能力&的高度来认识。近年来，社会学界对慈善事业的理论专著发表较多，有鉴于此，笔者不揣浅陋，谈谈自己的认识和见解。

Flow through the land, the land of the scale of operation allows the effectiveness of the land may be raised.

通过土地的流转，土地的规模经营可以让土地的效益得到提升。