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Table 1 Summary of the hybrid PI-SWERL test used to assess surface dust emissivities and threshold friction velocities

From: Dust emission source characterization for visibility hazard assessment on Lordsburg Playa in Southwestern New Mexico, USA

Cumulative Test Time (s)

Interval Time (s)

Operation

0–540

540

Aspirate PI-SWERL bell and record PM10 concentration

0–60

60

No ring movement

61–105

45

Accelerate ring to 2000 RPM

106–165

60

Maintain ring at 2000 RPM

166–210

45

Accelerate ring to 3000 RPM

211–270

60

Maintain ring at 3000 RPM

271–315

45

Accelerate ring to 4000 RPM

316–375

60

Maintain ring at 4000 RPM

376–420

45

Accelerate ring to 5000 RPM

421–480

60

Maintain ring at 5000 RPM

481–540

60

Decelerate ring to 0 RPM