本文主要论述极性转换的基本概念和它在有机合成中的作用。
In this article, the fundamental concept of umpolung and its role in organic synthesis are briefly discussed.
无极性（或二极性）电解电容器，可使用在极性转换的回路或直流回路上。
Non-polar (or Bi-polar) capacitors can be used in polaritiy- changing circuits or DC circuits.
在有机合成中一些不能用常规反应合成的有机化合物可以通过极性转换的方式来完成。
The organic compounds unable to be synthesized under normal reaction can be fulfilled by means of umpolung.
极性转换作用是有机反应中的一个理论问题，本文系统地介绍了极性转换的相关知识。
Polar conversion function is one theoretical question of organic response, study relevant knowledge of polar conversion.
极性转换的本质是有机化合物反应中心碳原子电性发生转换，即亲电性或亲核性发生转换的过程。
The essence of polar conversion is that organic compound reflects the carbon atom electricity in the centre and changes, kiss the electricity or kiss the core course changing.
先介绍了羰基化合物(醛、酮)的极性转换的各种方法，然后谈到胺的极性转换方法和最常用的极性转换试剂。
The various methods for the umpolung of carbonyl compounds (aldehydes and ketones), secondary amines and the most frequently used umpolung reagents are introduced.
极性转换方法是一种重要的有机合成新方法，对极性转换的概念和应用作了论述，并对一些极性转换的新技术作了简。
The concept and some applications about umpolung were expounded, and some new methods about the application of the umpolung were given.
主要用途：低电压整流，高频转换开关和极性保护。
Applications: Low Voltage, High Frequency Inverters, and Polarity Protection Applications.
阐述了该系统的设计思想和实现方法，详细分析了该系统的工作原理和单极性不归零码与双极性归零码的相互转换方法。
It states designing idea and realizing method of the system, analyses in detail the working principle of the system and mutual transforming method of NRZ code and AMI code.
但是偶尔这偶极场会转换极性——南极和北极倒转，这个过程似乎需要几千年的时间。
But occasionally this dipole field switches polarity north and south reverses, and this process seems to take a few thousand years.
它由与输入控制电压同步的触发器控制四模拟开关阵列的开关转换来选择输出极性。
Its output polarity is determined by the four analog switch array controlled by an input-synchronized trigger.
全平衡差分芯片转换成平衡信号的极性相反的单端信号。
The fully balanced differential chip converts the single ended signal into a balanced signal with opposite polarity.
该院转换用人机制，充分调动职工积极性；
This hospital transferred the mechanism of employing persons, mobilized the employee's enthusiasm.
处理器不能从转换器识别出负数，所有来自12位的双极性adc数据都是正的。
The processor does not recognize a negative number from the converter and assumes that all codes from the 12-bit, bipolar-in ADC are positive.
它由与输入控制电压同步的触发器控制四模拟开关阵列的开关转换来选择输出极性。
Its output polarity is determined by the four analog switch array controlled by an input - synchronized trigger.
它由与输入控制电压同步的触发器控制四模拟开关阵列的开关转换来选择输出极性。
Its output polarity is determined by the four analog switch array controlled by an input - synchronized trigger.
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