period average

A New Control Strategy for PWM Rectifier Based on Modified Period Average Model

基于改进周期平均模型的PWM整流器控制

The control model is constructed with the Period Average Model ( PAM ) of the load current .

采用负载电流周期平均模型（PAM）构建控制模型。

Long Period Average Concentration of Single Continuous Source Gas Effluent at One and Multi-receiving Point

单一定常点源的排放物在一个及多个接收点上的长期平均浓度的估算

May and maturity period average rainfall was tiny related to flue-cured tobacco chemical compositions .

而团棵期和成熟期的平均降雨量与烤烟化学成分的关联度最小。

In the process of environmental impact forecasting and valuation , it often requires computation in long period average concentration of single continuous source gas effluent at one and multi-receiving point .

在环境影响预测及评价过程中，常需要对某一定常点源的气态排放物在一个及多个接收点上的长期平均浓度进行估算。

Maturity period average temperature , average sunshine hours , average sunshine whole radiation , May average temperature , average relative humidity and June-July temperature was an important factor which affected the accumulation of flue-cured tobacco chemical compositions .

成熟期的平均气温、平均日照时数、平均日照全辐射，团棵期的平均气温、平均相对湿度和旺长期的气温是影响烤烟化学成分积累的重要因子。

Based on the Gauss diffusion model and annual average concentration computation , a manual method of long period average concentration evaluation at one or multi-receiving point was discussed , and a BASIC program was drawn for computer evaluation of average annual concentration .

本文根据高斯扩散模式和年平均浓度的计算为例，讨论一个及多个接收点上长期平均浓度的手算法，并提出电算法求年平均浓度的BASIC程序。

To reduce the switching losses of IGBTs in PWM rectifier , a third order square wave is added to the phase voltage control signal on the basis of the Improved Period Average Model . This new control algorithm leads to no switching in about 1 / 3 cycle .

为降低PWM整流器的开关频率，本文在整流器的改进周期平均模型基础上，在相电压控制信号中叠加三次方波信号，使得整流器中的开关管有1／3时间不动作。

The result showed that during the supplementation period , average daily gain of treatment group was significantly greater than control group ( P < 0.01 );

结果表明，在补饲期内，试验组和对照组的平均日增重分别为838和487g（P＜0.01）；

Gallbladder cancer accounted for 0 1 % ~ 1 1 % of abdominal surgery in the same period , average was 0.28 % .

胆囊癌占同期普通外科疾病的构成比为01%～11%，平均为028%。

The vitamin C content showed a significant cubic polynomial correlation with growing period , average fruit weight , fruit vertical and across diameter during the fruit development ;

每100g果实维生素C含量与生长期，平均单果重，纵、横径均呈极显著的三次多项式相关性；

Finally , the influences of the wavelength , radius and refractive index of the inner clad on the average period and average power are numerically discussed . 2 .

然后，计算分析了入射波长、内包层半径和内包层折射率对平均振荡周期和平均功率的影响。

During the period 1999-2006 average total assets profit margin of each regional power generation industry is raising , this makes resource allocation efficiency of all power generation enterprises in each region improve in overall .

各区域发电行业的平均总资产利润在1999&2006年期间呈上升趋势，使得各区域内全部发电企业的资源配置效率整体上提高。

In the same period , average weekday boardings on New Jersey Transit buses at the Port Authority terminal also increased , to 78006 riders from 72506 .

在同一时期，在港务局码头搭乘新泽西公共交通大巴的乘客也从72506人增加到78006人。

During this period the average error of accuracy is of the order of 1 % and max. error is 2 % in 1988 - The accuracy of forecast model reaches first class grade .

1981～1990的预测精度平均误差为1%，最大的年份也只有2%，模型精度达到一级。

Results In normal albuminuria period , average BP and serum β 2MG in treatment group were lower markedly , and GFR lower most markedly while all index in control group were not different markedly .

结果正常白蛋白尿期中，治疗组肾小球过滤率降低非常显著，平均动脉压和血β2微球蛋白降低显著，对照组各指标则无显著性差异；

The first paratyphoid early clinical symptoms were mainly fever , dizzy , headache , pharyngoxerosis , pharynx-ache and dry-cough with 7-27 days of incubation period , average 15 days .

甲型副伤寒早期临床症状以发热、头晕、头痛、咽干、咽痛、干咳为主，潜伏期7~27天，平均15天。

The analysis on the relativity between average EVI values within winter wheat growing period and average temperature , rainfall , hours of sunshine shows that temperature and rainfall are the main limiting factors , among them temperature plays the leading role .

冬小麦生育期内EVI均值与平均温度、降水量、日照时数相关性分析结果显示，温度和降水是冬小麦生长的主要限制因子，其中温度起主导作用。

A new concept of periodically used systems is proposed . For several specific systems of this kind , formulae of initial system availability , average system availability in operating period and average time required for the system to enter into normal state of operation are given .

本文提出间歇使用系统的概念，对几类具体的间歇系统，导出了系统起始可用度、在使用期系统平均可用度以及在使用期内系统进入正常状态所需平均时间的计算公式。

During the experimental period , average daily gains of responders and surgically castrated boars were higher ( p < 0.05 ) than intact boars , average daily gains of non-responders were similar to intact boars ;

试验期间，免疫效果好的和外科阉割公猪日增重明显高于（p<。.05）完整公猪，免疫效果差的公猪与完整公猪日增重差异不显著；

After a long running period , average size of sludge particle particle was reduced from 100 μ m to 30 μ m , and disperse growth of sludge appeared at low temperature and high load , which caused the rise in turbidity and COD of supernatant .

经过长期运行，污泥颗粒平均粒径从100μm降至30μm，并在低温和高负荷的情况下表现出分散生长的特点，从而使上清液的浊度和COD升高。

You may ask why we look back over such a long period to measure average rates of return .

你也许会问为什么我们要往回看这么长一个期间来衡量平均回报率。

Over the same period , the average working mother reduced her weekly housework load by two hours .

而在这一时期内，普通职业妈妈每周料理家务的时间则减少了两小时。

As you can see , in the United States , inflation for most of this period remained below average .

正如你所见到的，在美国，这个阶段大部分时间的通货膨胀都低于平均数。

The ratio of the number of workers that had to be replaced in a given time period to the average number of workers .

给定时间内替换的工人数与通常工人数的比率。

This method could solve the optimal operation issues for parallel stations with various operation modes , time period divisions and average daily heads of each station .

该方法可以解决并联泵站群各站间不同调节方式、不同时段划分、及不同日均扬程下的日优化运行问题。

Mean time to failure is the average continuously operational period & i.e.the average period between the end of one failure and the beginning of the next .

平均失效到达时间是连续运行期间的平均值&也就是说，在结束一个失效和开始另外一个之间的平均周期。

During the study period , the average price-earnings ratio of listed companies is more than 58 times , ultra funds up to 267.787 billion Yuan .

在研究期间内，上市公司的平均市盈率超过58倍，超募资金高达2677.87亿元，即平均每个上市公司超募5.8亿元。

Feeding trials were conducted to determine weaned piglets during the trial period , the average daily gain , feed conversion rate and the average incidence of diarrhea .

分别进行饲喂试验，测定断奶仔猪在试验期的平均日增重、平均饲料转化率和腹泻发生率。

Over the whole growing period , the average is about 0.19.The canopy extinction coefficients for incident short and net radiation are 0.51 and 0.41 , respectively .

生育期平均反射率约为0.19；总辐射和净辐射的消光系数分别为0.51和0.41。