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Accordingly, a double-blind, crossover study (Dong et al., 2019) examining the effect of ionization air purifiers on the cardio-respiratory health of students aged 11–14 in a school showed that IAQ improved to a great extent but the high levels of negative air ions can harm cardiac ...
The new forecasting system, developed by the National Center for Atmospheric Research (NCAR) in collaboration with the Indian Institute of Tropical Meteorology (IITM) in Pune has begun providing 72-hour forecasts of fine particulate matter, known as PM2.5. These tiny airborne particles, 2.5 microns...
of course. But unlike many big companies that fly solo, Cummins insists on splitting ownership fifty-fifty, and it stocks its overseas offices with local talent. Going half-and-half has allowed Cummins to get into tough markets, like China, that might resist a company that tried to force it...
When the control pressure pin (blue line in Figure 1b) feeding W and channel a builds up with a small gradient, the hole in the piston does not allow the pressure difference above and below the piston to be large enough to overcome the force coming from the spring. Then, the brake act...
atmosphere Article Random Forest Algorithm for the Relationship between Negative Air Ions and Environmental Factors in an Urban Park Si Miao 1,2,†, Xuyi Zhang 1,2,3,†, Yujie Han 4, Wen Sun 4, Chunjiang Liu 1,2,3 and Shan Yin 1,2,3,* 1 School of Agriculture and Biology and ...