In this paper, some problems about IGBT's operation characteristics are discussed. A driving mode called zero voltage commutation and zero current commutation ( ZVC/ ZCC) technique with high efficiency and safety is introduced.

The high frequency switch technology of large power is developed successfully by the perfect control of PWM ( Pulse Width Modulation) and ZCC ( Zero Current Control), ZVC ( Zero Voltage Control) in the unit.

通过PWM（脉宽调制）和ZCC（零电流控制）、ZVC（零电压控制）的完整控制，成功开发应用了大功率高频开关技术。

Conclusion: ZCC could inhibit the remodeling of airway in chronic asthma by way of reducing the precipitation of collagen and Fn, thus help the prevention and treatment of chronic bronchial asthma.

结论：止喘胶囊（补肾健脾法）可能通过减少气道壁胶原和Fn沉积，抑制慢性哮喘的气道重建，有利于对慢性哮喘的治疗和预防。

This paper makes good investigation and analyses ZCC's management environment and practical situation of marketing and finds out the company's advantage and disadvantage, market opportunity and threatens.

本文中，笔者试图通过深入调查和分析我国老牌国有硬质合金企业&株洲硬质合金集团有限公司的市场营销环境与市场营销的现状，发现该公司存在的优、劣势以及面临的市场机会和威胁。

ZVC/ ZCC Driving Mode for IGBT

IGBT的ZVC/ZCC驱动模式

Based on the ERP executing of ZCC carbide mixture, the article discussed the process management factors of ERP executing.

以株洲硬质合金集团有限公司混合料ERP项目实施过程管理为基础，探讨ERP系统实施过程管理要素。

Inhibitor MNX was synthesized using amine, ketone and aldehyde. Corrosion inhibitor YSH-05 for high-temperature acidification was prepared by combining inhibitor MNX and four synergistic agents ( PA, XI, YCl and ZCl).

以脂肪胺、芳香酮和甲醛为主要原料，室内合成了母体缓蚀剂MNX，与四种增效剂（PA、XI、YCl和ZCl）进行了复配，制备出了高温酸化缓蚀剂YSH-05。

The GR positive cell in epileptogenic rat hippocampus and cerebral cortex and the effect ZCL on the GR positive cells was observed with radioimmunoassay ( RIA).

应用免疫细胞化学方法观察并计数致痫大鼠海马和大脑皮质GR免疫阳性细胞数目的改变及中汇川黄液的影响。

To study the effects of crude polysaccharide from arnebia euchroma ( Royle) Johns ( ZCP) on phospholipids fatty acid content diversity and of erythrocyte membrane for S180 mice.

研究了紫草多糖对S180荷瘤小鼠红细胞膜磷脂脂肪酸含量及脂肪酸组分的影响。

The fruit treated with ZCP ⅲ showed a satisfactory storage behavior: the granulation rate and decay percentage were lower than 10% and 5% respectively after 100 day storage at room temperature.

由ZCPⅢ处理的果实具有令人满意的保鲜效果：在室温下贮藏100天，其粒化率和腐烂率分别小于10%和5%。

The potential of zero charge ( ZCP) was determined by electrochemical impedance measurements and the adsorption model of CM-chitosan on mild steel surface was established.

用电化学阻抗法测定了碳钢在盐酸溶液中的零电荷电位，确立了CM-chitosan的吸附模型。

The algorithm is robust about noise, rotation and so on. And it has strong security and uniqueness. ( 2) Based on the perceptual hashing of the speech ZCR ( zero-crossing rate) and speech centroid, a speech content authentication algorithm is proposed.

算法对旋转、噪声是鲁棒的，同时也具有较强的安全性与唯一性。（2）根据语音过零率及质心特征，设计了一种基于感知哈希的语音内容认证算法。

Short-time logarithm energy with a constant has be used in the place of short-time energy of classical arithmetic in this article. The quotient and product of short-time energy and short-time zcr ( zero crossing rate) are basic parameters of the arithmetic.

本文以带常数的对数短时能量代替传统的短时能量，以短时过零率、短时能量之商、积作为端点检测算法中参量。

And it searches much further for the unvoiced frame according to the ZCR ( zero crossing rate), which is differ from unvoiced frame to background frame.

根据背景音和静音过零率的不同，进一步搜索符合要求的静音帧；

Based on acoustic characteristics of cough, using the short time zero crossing ratio ( ZCR) identifies the suspicious coughs in order to get the threshold of short time energy.

利用过零率来定位可疑咳嗽，从而确定能量阈值。

The stability against playback speed modification of ZCR ( zero-crossing rate) of audio signal is confirmed by theoretical analysis and experiments.

分析并通过实验验证了音频信号的过零率对回放速度修改这种去同步攻击的稳定性。

Then, the short time energy is combined with short time ZCR to implement the endpoint detection of cough in continuous speech.

在此基础上，将短时能量和过零率用于连续语音流中咳嗽信号的端点检测，具有较好的鲁棒性。

Super-high accelerator ZDC/ MA or ZDC/ M was used in vulcanization system to meet the requirements of vulcanization rate, and filling agent A was used to meet the special requirements such as embossed shaping.

硫化体系采用超高促进剂类型，ZDC/MZ或ZDC/M配型满足硫化速度要求；用填充剂A作填充剂，可以满足压花成型性的特殊要求。

About 45% of 900 Chinese people surveyed by China-based research firm ZDC this year said they have stopped watching TV, while 23% said they watch it every day and 21% watch frequently.

根据总部位于中国的研究公司ZDC的一项调查，今年接受调查的900个中国人中，有45%说他们已经不再看电视，而23%说他们每天都看电视，21%经常看电视。

According to data from ZDC, an internet consumption research centre, mobile phone makers competing in Chinese market totaled 118 in 2017, down from 134 in 2016.

根据一家名叫ZDC的互联网消费调研中心的数据显示，2017年中国手机市场上参与竞争的厂商数量有118家，较2016年的134家有所减少。

The clearance between the beating roll and bedplate in a ZDC beating engine is very important for its functioning.

ZDC打浆机飞刀辊与底刀之间的间隙，对打浆机的性能有着重要的影响。