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2. Do Air Purifiers Actually Work? Here's What Experts Say - AOL

   www.aol.com/air-purifiers-actually-heres-experts...

   What should I look for in an air purifier? Finding the right air purifier in a sea of options can feel overwhelming. A majority of shoppers will need to weigh how big their space is (i.e. how much ...

3. Computation of radiowave attenuation in the atmosphere

   en.wikipedia.org/wiki/Computation_of_radiowave...

   The previous point of view of worst case leads to an elevation angle of −1.87-degree and an attenuation of 170.77 dB. With this kind of attenuation, every system would be unusable! It was found also for this case that with the nominal elevation angle, the distance of the tangent point to ground is 5.84 km; that of the worst case is 2.69 km.

4. Free-space path loss - Wikipedia

   en.wikipedia.org/wiki/Free-space_path_loss

   In telecommunications, the free-space path loss (FSPL) (also known as free-space loss, FSL) is the attenuation of radio energy between the feedpoints of two antennas that results from the combination of the receiving antenna's capture area plus the obstacle-free, line-of-sight (LoS) path through free space (usually air). [1]

5. Path loss - Wikipedia

   en.wikipedia.org/wiki/Path_loss

   Path loss, or path attenuation, is the reduction in power density (attenuation) of an electromagnetic wave as it propagates through space. [1] Path loss is a major component in the analysis and design of the link budget of a telecommunication system. This term is commonly used in wireless communications and signal propagation.

6. I Tried the Mila Air Purifier for 4 Weeks—Here’s My Honest Review

   www.aol.com/lifestyle/tried-mini-mila-air...

   Marissa Wu. First, the unboxing and setup. Really, it was 20/20, no notes. The air purifier arrived minimally packaged—there was actually no additional packaging; it showed up to my door in its box.

7. Attenuation - Wikipedia

   en.wikipedia.org/wiki/Attenuation

   The attenuation in the signal of ground motion intensity plays an important role in the assessment of possible strong groundshaking. A seismic wave loses energy as it propagates through the earth (seismic attenuation). This phenomenon is tied into the dispersion of the seismic energy with the distance. There are two types of dissipated energy: