查询词典 frame of reference

A new digital measure method was presented based on the three coordinate measuring machines. Compensation of sensor radius, establish part's measure reference frame, the best measuring layout and mix programmed scanning all those not only enhance measure precision and increase efficiency of scanning measure, but also the data can image geometrical characteristic of complex surface. The method was illuminate by a sample, and the digital data of the surface adumbration are obtained at last

在三坐标测量机的基础上给出了一种数字化测量曲面轮廓的方法，通过测球半径的补偿、坐标系的建立、最佳测量路径的规划以及混合编程扫描，提高了测量精度及扫描测量的效率，而且采集到的数据可以反映曲面的几何特征，并以实例对该方法进行说明，得到了数字化的曲面轮廓数据。

According to the fundamental of vector control,a digital closed-loop control system of permanent magnet synchronous motor based on dsPIC30F6010 was designed and a model of permanent magnet synchronous motor in the estimation two phase rotating reference frame was introduced and an extended back electromotive force equation was deduced.

根据永磁同步电动机矢量控制的基本原理，设计了一种基于 dsPIC30F6010的无位置传感器永磁同步电动机控制系统，并介绍了在估算两相旋转坐标系下的PMSM模型，推导出了反电势方程的扩展形式。

A new sensorless speed control scheme for permanent magnet synchronous motor driver is presented. The nonlinear mathematical model of PMSM is established in α-β reference frame and linearized around the best estimator.

永磁同步电机无位置传感器调速系统具有控制方法简单，转矩脉动小，抗扰动能力强，调速性能好等特点，调速系统所要解决的问题是采用何种方法获取转速和转角。

In short, the thesis gives its own thinking about how to understand city brand and try to search the new frame and new method of study the city problem. For the city manager, the thesis has certain reference value on the construction of the city brand.

总体而言，本文就如何认识和把握城市品牌给出了自己的思路，并试图探索研究城市问题的新框架和新方法，对于城市管理者进行城市品牌的建设有一定的参考价值。

Results also suggest that declarative knowledge is built in relations with object's experience, and was connected to form procedural knowledge in the process of finding ways. As for the transformation between procedural knowledge and configurational knowledge, objects can do it through mental process without maps, yet maps still provide a reference frame for it.

其中，叙述性知识的建立是与经验相关的，能在找寻路径的过程中获取，并加以联结形成程序性知识；程序性知识与结构性知识的转换，则可依个体的心智过程或藉由地图的辅助提供架构。

Key words: theorem of kinetic energy; conservation law of mechanical energy; reference frame

动能定理，机械能守恒定律应用

It has the architectural features of distinctiveness, steadiness and continuousness, and is regarded as a reference frame carrying on the traditional Chinese culture.

该建筑形态早期呈现中西合璧式风格，并逐渐导致中国传统建筑艺术的复兴，具有建筑学上的特异性、稳定性和连续性特征，被视为弘扬中国传统文化的表象参照物。

Combined with practical engineering,this paper introduces the application of truss corbel in the construction of 0# block in continuous rigid frame bridge,and carries out mechanical calculate of its strength and rigidity, shear and bending-resistance of corbel ,deformation of truss,and bearing capacity of embedded parts,which to offer a reference for similar engineering construction.

结合工程实例，介绍了桁架牛腿在连续刚构桥0号块施工中的运用，并对其强度、刚度、牛腿的抗剪抗弯能力、桁架变形、预埋件承载力等方面进行了力学计算，可供类似工程施工参考。

A frame-by-frame address code time reference recorded on the spare track of a videotape or inserted in the vertical blanking interval for editing purposes.

一个逐帧的地址编码时间参照，记录在一盘录像带的备用轨道上，或插入到垂直的空白间隔中以备剪辑之需。

Plates of globular cluster M3, taken with the 40cm refractor at Sheshan station of Shanghai Astronomical Observatory, are used by this work. The difference of epoch of these plates is up to 81years. The positions and absolute proper motions of 24 stars in ACT catalogue, which links with the Hipparcos Catalogue based on the International Celestial Reference System, are used as the reference frame. Using the central overlapping principle, the absolute proper motions of 534 stars in the region of about 100'×100' around the cluster are determined. After the membership determination of the stars which based on the data of proper motions, average absolute proper motion components for the cluster of -0.3±0.3 mas/yr in R.A.

本文使用上海天文台佘山40厘米折射望远镜拍摄的14张最长时间跨度为81年的球状星团M3底片的PDS扫描结果，使用与 Hipparcos星表相联系的基于国际大球惯性参考系的ACT星表中的 24颗恒星的位置和绝对自行为参考架，用中心重叠法进行天体测量归算，得到了这个星团中心附近100'×100'天区内534颗恒星的位置和绝对自行，并利用这些自行对成员概率进行了估算，得到这个星团的赤经方向绝对自行为- 0.3±0.3mas/yr，赤纬方向绝对自行为-3.1±0.3mas／yr。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。