Although it is possible to have a negative leap second - - that is , a second deducted from coordinated universal time - - so far all have been add - ons , reflecting the earth ' s general slowing trend due to tidal braking 尽管也有实施负闰秒制（从协调世界时中扣除一秒）的可能，但迄今为止，只有加，没有减，这说明由于受潮汐减速的影响，地球的自转速度大体上呈减慢趋势。
As these record levels become the benchmark for the food industry today , knock - on price rises are set to hit consumers in coming months , raising inflationary pressure and constraining the ability of central banks to mitigate the economic slowdown 随着这些创纪录的价格在今天成为食品行业的基准，价格连锁上涨将在未来几个月中传递到消费者层面，从而增加通货膨胀压力，限制央行抵御经济减速的能力。
As these record levels become the benchmark for the food industry today , knock - on price rises are set to hit consumers in coming months , raising inflationary pressure and constraining the ability of central banks to mitigate the economic slowdown 随着这些创纪录的价格在今天成为食品行业的基准，价格连锁上涨将在未来几个月中传递到消费者层面，不仅会增加通货膨胀压力，还会限制央行抵御经济减速的能力。
Design engineers now selecting pmbldc motors over conventional dc or induction motor drives for the following reasons : 1 ) the absence of brushes results in an essentially maintenance free operation and eliminates the undesirable effects of commutation such as sparks , brush - loss , radio - frequency interference , etc . 2 ) the low inertia of the rotor enhances the quality of the mechanical response of the motor , shortening the acceleration and deceleration time . 3 ) utilizing rare - earth permanent magnet materials with high coercive force results in substantially higher efficiency than their counterpart with brushes of the same size . 4 ) because of the absence of commutation segments , the stator construction is simple 现在的工程师们更为青睐永磁无刷直流电动机是因为以下几点原因： ( 1 )去除了电刷的永磁无刷直流电动机彻底地免除了维护而且消除了我们不希望的由于换向带来的火花、电刷损耗以及无线电干扰等等； ( 2 )低转动惯量的转子提高了电机机械响应的质量，从而缩短了电机加速和减速的时间； ( 3 )高矫顽力稀土永磁材料的使用使得同样尺寸的永磁无刷直流电动机比传统的直流电动机效率高； ( 4 )由于没有机械换向部分定子的结构简单了。
In the latest years , people have designed and made many types of magnetic micromotors , but there are still many problems and much work w hich needs to do about the working principal , design theory and experimental research of magnetic micromotors , this dissertation was just aimed at these problems and did following work : first , on the basis of analying and comparing the working principals and structures of available magnetic micromotors , this dissertation proposed a new type of magnetic micromotor , introduced its structure , controlling methods and the features . according to the basic principles of the fixed - point movement of the rigid body , the dissertation revealed the moving relationship between the rotation of the inner magnetic field of the motor and the rolling of the rotor , presented the moving equation of the rotor and the calculation formula for the rotation ratio between the the inner magnetic field and the rotor , and so made clear the relationship between the structure parameters and the moving characteristics of the motor 十年来，人们已经设计制作出了多种形式和结构的电磁微电机，但是有关电磁微电机的设计理论和实验研究仍然处于探索完善阶段，本文正是针对这方面的问题以电磁式微电机为研究对象做了以下工作：首先，在对电磁式微电机的各种工作原理和结构方案进行深入研究和分析比较的基础上，本文首次推出了“端面摇摆式电磁微电机”的设计思想，介绍了其结构原理、控制原理和该电机的特点，并从刚体定点运动的基本原理出发，揭示了电机内部磁场的旋转与转子滚动之间行星减速的运动关系，推导出了转子的运动方程和电机旋转磁场与转子的减速比计算公式，从而明确了电机结构参数与电机运动特性的关系。
Design engineers now selecting pmbldc motors over conventional dc or induction motor drives for the following reasons : 1 ) the absence of brushes results in an essentially maintenance free operation and eliminates the undesirable effects of commutation such as sparks , brush - loss , radio - frequency interference , etc . 2 ) the low inertia of the rotor enhances the quality of the mechanical response of the motor , shortening the acceleration and deceleration time . 3 ) utilizing rare - earth permanent magnet materials with high coercive force results in substantially higher efficiency than their counterpart with brushes of the same size . 4 ) because of the absence of commutation segments , the stator construction is simple 现在的工程师们更为青睐永磁无刷直流电动机是因为以下几点原因： 1 )去除了电刷的永磁无刷直流电动机彻底地免除了维护而且消除了我们不希望的由于换向带来的火花、电刷损耗以及无线电干扰等等； 2 )低转动惯量的转子提高了电机机械响应的质量，从而缩短了电机加速和减速的时间； 3 )高矫顽力稀土永磁材料的使用使得同样尺寸的永磁无刷直流电动机比传统的直流电动机效率高； 4 )由于没有机械换向部分，定子的结构简单了。
All planets in the solar system much like earth must leave behind whatever destructive thought - form that they entered that caused their “ cooling ” or slowing of time ; and as they do so they build again into a fifth dimensional dance in which instant manifestation becomes possible 太阳系统中的所有行星与地球非常类似，都必须离开深藏的，无论怎样他们曾进入的，导致他们在时间中冷却与减速的毁灭的思想模式；就像他们所做的，重新建立并进入五次元的振动，在其中立即的显现成为可能。
