air change

However, the air change in the amount of information in the underwater acoustic communication, time-varying, frequency change and other characteristics caused by inter-symbol interference, seriously affecting the quality of communication.

但是，水声通信中信息量的空变、时变、频变等特性引起的码间干扰，严重影响了通信质量。

To change the closed water test into close air test, by comparing the quantitative mathematical model for closed water test with the quantitative mathematical model for closed air test, the relations between the mathematical model of air test and the one of water test were deduced.

为将闭水试验改成闭气试验，通过对比闭水试验与闭气试验定量数学模型，推导出了两者流量之间的换算关系，为在实际生产中运用闭气试验提供了坚实的理论基础。

When human breathing impact must be considered with people inside microenvironment, all the derivation formulae could be used to calculate air change flow.

微环境内有人时必须考虑人释放的影响，这样箱子模式的各种推导公式都可以计算新风量值，且结果准确，准确度高。

So, we think air pressure change is one of the main factors of aberration of observational daily change curve of tensometer.

因此认为气压变化是伸缩仪观测日变曲线畸变的主要因素之一。

Predicting the volume of natural air change in underground buildings by the Monte Carlo technique

地下建筑自然通风量的蒙特卡罗模拟

Experts recommend that your ventilation system should provide at least one air change every hour.

专家推荐你的通风系统应该至少要每小时换一下气。

The paper calculates the concentration of HCHO respectively in two kinds of airflows, analyzes the distributions of the concentration field, non-dimensions concentration field, and air change efficiency, and compares the results of calculation with others using CFD method.

利用CFD软件模拟计算了两种气流组织方式下室内甲醛的浓度场，分析了室内浓度场、无因次浓度、空气交换效率的分布规律，并与传统计算方法的结果进行了比较。

A reason for this is that RH buffering by materials is feeble and short lived compared with temperature buffering when the air change rate is large.

原因是当空气交换量大时，和热缓冲材料相比湿度缓冲材料的功能较弱，而且寿命不长。

Introducing equivalent person-density, explores the ultimate equivalent person-density at the largest air change rate the criterion regulated.

引入当量人员密度，提出了规范中换气次数上限适用的当量人员密度限值。

Air change flow is one of the sanitarian standards which can evaluate indoor environmental quality, and it is also one of the important parameters that may calculate gas discharge amount per unit time.

新风量是评价室内微环境空气卫生质量的主要卫生指标之一，也是计算室内某种气体单位时间排放量的重要参数。

British boy Liam Derby Xia contracts the rare lung air change insufficient illness.

英国男童利亚姆？德比夏尔患有罕见的肺换气不足病症。

The Influences of the Air Pressure Change on Gravity at Wuhan Station

大气压力变化对武汉台站重力场观测的影响

Study on Method for Determination of Air Change Flow in Air-conditioned Carriage

空调旅客列车新风量测定方法的研究

An Overview on Studies of Surface Air Temperature Change

地表气温变化研究的现状和问题

Forecast of the surface air temperature change of Wuhan in midsummer

武汉市盛夏气温预报

Preliminary results indicate that air change flow, which is calculated by analytic solution and difference method, has no significant statistical difference without people inside microenvironment.

结果表明，没有人存在下，用箱子模式的解析解法和差分法计算的新风量值没有明显的统计差异；

The Air Temperature Change in the Past 2000 Years Simulated Using Solar Activity Indices

用太阳活动拟合近2000年的温度变化

Analysis of Surface Air Temperature Change in Macau During 1901-2007

1901&2007年澳门地面气温变化的分析

When increasing the air change rate in the underground space, the radon concentration in the air will fall fast.

在较高的氡浓度状态下，室内氡浓度对通风十分敏感，增大地下空间的通风换气率，会使空气氡浓度大幅度的降低。

Study on Air Temperature Change in Lanzhou City in Recent 70 Years

近70年来兰州城市气温的变化

Especially discusses the ways of choosing a proper air change rate.

讨论了换气次数的正确选取方法。

Finally, the determination method of minimum thermal resistance to prevent mould growth is proposed according to internal moisture production rate, air change rate, indoor and outdoor temperature.

最后根据室内产湿率、换气效率及室内外温度条件得出了基于预防霉菌生长的墙体的最小热阻的确定方法。

Air change rate was calculated by using CO2 two-parameter build-up method and one-parameter decay technique.

房间的换气次数根据两参数CO2浓度上升法和单参数浓度下降法进行计算。

In those coupling states, the load change command from temperature controller is by-passed, and the air and fuel flows change very slowly because of the nature of the closed coupling system.

在那些耦合状态下，由温度调节器来的负荷变动指令被旁路，由于耦合系统闭环的性质，空气和燃料流量变化极慢。

This rugged diaphragm minimizes loss the air change and ensures long and trouble-free life the system.

这种结实的隔膜将空气变化的损耗减少到最小程度,确保了系统更长的无故障的使用寿命.

Application of air change ventilation system in hydropower house

置换通风系统在水电站厂房中的应用

Under same air change rate, the particle deposition in horizontal air supply is 65% less than that in vertical supply model.

医护人员周围的粒子浓度高于相近换气次数下的垂直流送风方式。手术关键区上的沉降粒子数明显低于垂直送风方式，相近的换气次数下，粒子减少率约为65%。

According to the principle of SS-Y tensometer, We analyze the influence and relation of air pressure change toward observational daily change curve of tensometer.

根据SS-Y伸缩仪的原理，从理论和实际观测分析了气压变化对伸缩应变观测日变曲线的影响及两者间的相关性。

Starting from sustainable development of city, this paper analyzes structuring framework of modern ecological city. According to demand of ecological city construction, this paper makes a discussion on vegetation, air change, selection of tree species, etc.

以城市可持续发展为出发点，分析了现代生态城市的构建框架，按生态城市的建设要求，从城市的植被、空气变化、树种选择等方面进行了探讨。

A Study of Upper Air Temperature Change

高空大气温度变化研究