您要查找的是不是：
- The negative air ion concentration in different communities were as follows: lower greenbelt>woodland>weed land>bald land>concrete piazza. 不同植被类型由高到低依次为：花卉绿地＞林地＞宜林荒草地＞裸露地＞水泥广场；
- Assessment of air cleanness degree in Beijing using negative air ion concentration as an index 用空气负离子浓度对北京地区空气清洁度进行初步评价
- Spatio-temporal changes of negative air ion concentrations in Beijing 北京地区空气负离子浓度时空变化特征的研究
- Negative air ion concentration 空气负离子浓度
- negative air ions concentration 空气负离子浓度
- Keywords Negative Air Ion;Inspirable Particle Concentration;Indoor Air Quality Monitoring; 空气负离子浓度;可吸入颗粒物浓度;室内空气质量监测;
- Fixing and Negative Air Ion Effect on Silk by Sol-Gel Process 溶胶凝胶法对真丝绸的固色及负离子效应
- Methodological Study on Measurement of Negative Air Ion 空气负离子剂量测量方法的探讨
- Study on the Contribution of Winter-season Crops to Negative Air Ion 冬季田间农作物对环境空气负离子浓度影响的研究
- electrically generated negative air ions (ENIs) 空气负离子
- PH value: Self defines the negative logarithm being hydrogen ion concentration. PH值：本身定义是氢离子浓度的负对数。
- Study on Variation of Air Ions Concentration in Airtight Darkroom 密闭暗房内空气离子浓度变化规律
- negative air ion 空气负离子
- negative air ion content 负离子浓度
- The increased ion concentration generates a negative potential, preventing the cell from being able to produce an excitatory electrical pulse. 细胞内多出的负离子产生负电位，使得神经细胞不容易产生兴奋性的电脉冲。
- Keywords electrically generated negative air ions（ENIs）;Caenorhabditis elegans;development;lifespan;brood size; 空气负离子;秀丽隐杆线虫;发育;寿命;繁殖性能;
- The results show that: the level of air ions concentration was improved significantly by forest vegetations; 研究显示：山林植被提高空气负离子浓度水平显著；
- Hint: When solute is added to a saturated solution, there is no change in ion concentration. 提示：当溶质加入已饱和溶液，对离子浓度无影响。
- negative ion concentration in the air 空气负离子
- air negative ion concentration (ANIC) 空气负离子
