The results showed that negative air ion concentrations increased gradually and ion polarity ratio decreased gradually from city center to suburb.
结果表明,从市中心向郊区空气负离子浓度逐渐增大,单极系数逐渐减小;有林地区空气负离子浓度明显高于无林地区,针叶林地区全年平均空气负离子浓度高于阔叶林地区,但春、夏季节则阔叶林地区高于针叶林地区;有瀑布和溪流等动态水的地方空气负离子浓度明显增加;室内空气负离子浓度低于室外,但绿色植物可使室内空气负离子浓度增加;一天中白天空气负离子平均浓度高于夜间,一年中夏季最高、冬季最
Based on three years of observation on the spatio-temporal changes of negative air ion concentrations in Beijing, air quality was assessed using ion polarity ratio and air ion assessment index (CI).
根据北京地区3年的空气负离子浓度时空变化的实测资料,利用空气离子单极系数及安倍空气离子评价指数对北京地区空气质量进行了初步评价。
However, the mineralization rate of ACF cathode system was much higher than the other.
通过电子自旋捕集技术(ESR)检测两种反应体系中产生的活性中间体,发现在两种体系中均有高活性的羟基自由基生成,ACF阴极体系中产生的羟基自由基的量远远高于阳极体系产生量,这是阴极体系有机物矿化效果较好的根本原因。
k value of SFL tool in homogeneous media mainly depends on the size of electrode array,and its accuracy is a good help to the design of the array.
球形聚焦电极系的ｋ值和纵向分辨率。
Secondly, it presents the research in three areas on this topic in detail after the main frame of this topic is introduced, which are the design and calibration of electrode array test unit for measuring the resistivity, the hardware design, installation, software development and debugging of one-dimensional resistivity measurement device on gas hydrate.
其次,在介绍了本课题的主体框架之后,详细介绍了本课题三个方面的研究内容:电阻率测量中电极系测试单元的设计与标定、一维天然气水合物电阻率测量装置硬件设计、安装及软件编制与调试。
ecting-electrode transmission
选色电极系统透过率
A complete series of flame electrodes, electrode assemblies, spark electrodes etc.
全系列火焰电极，电极配件，火花电极等。
The origin in a polar coordinate system;the vertex of a polar angle.
极点一个极坐标系中的始端；一个极角的顶点
About Historical Changes in the Relations of Big Powers in the Asia-Pacific Region;
亚太大国关系的历史变迁:单极?两极?还是多极?
Biological Investigations of Terrestrial Antarctic Systems
南极陆地系统生物调查（南极陆生调查）
Applications of the Minimax Methods to the Second Order Hamiltonian Systems;
极小极大方法在二阶Hamilton系统中的应用
The Variable Polarity Tig Welding Control System Based on AT89S52
基于AT89S52的变极性钨极氩弧焊控制系统
Reachability and observability of min-max-plus systems(F,G,H)
极小-极大-加系统(F,G,H)的能达能观性
Arcto-Tertiary flora
北极第三纪植物区系
solar-powered cathodic protection
太阳能阴极保护系统
This concerns us deeply.
这事对我们关系极大。
spherical-polar tracking system
球面极坐标跟踪系统
Excellent ability of systematical management.
有极强的系统管理能力。
Agriculture is of vital importance to the nation's economy and the people's livelihood.
农业关系国计民生极大。
Positive crankcase ventilation (PCV)
积极式曲轴箱通风系统
maximum likelihood coefficient estimator
极大似然系数估计量
Active Partnership Policy
积极的伙伴关系政策
The Limit Cycle of a Kind of Kolmogorov s System;
一类Kolmogorov系统的极限环