The objectives of this work were (i) to validate electrical zone sensing and laser diffraction for the analysis of primary particle size in the case of inhalation dry powders and (ii) to study the influence of the aggregation state of the powder on the sizing techniques. Free-flowing dry powders were prepared by spray-drying with a combination of albumin, lactose, and dipalmitoylphosphatidylcho...

To solve the problems of low processing efficiency and poor glass surface quality when using rare earth polishing powder to grind super-hard K9 glass. The potential, phase structure, morphology, particle size distribution nano-rare were characterized. Compare evaluation indexes such as efficiency, contact angle after process is changed. results comparative study show that average roughness heat...

The critical subject of transverse crack detection in a rail head is treated in this paper. Conventional bulk wave ultrasonic techniques often fail because of shelling and other surface imperfections that shield the defects that lie below the shelling. A guided wave inspection technique is introduced here that can send ultrasonic energy along the rail under the shelling with a capability of fin...

Non-destructive Hertzian contacts are used to couple ultrasonic waves for characterization and defect detection in anisotropic solid pates. Spring loaded quartz rods bonded to PZT-5H transducers are used to form a point source point receiver pair and ultrasonic plate modes are excited and detected around 200 KHz with 50 dB signal to ratio at the receiving end. Measurements are performed on sili...

This paper describes the ultrasound assisted dispersal of a low wt./vol.% copper nanopowder mixture and determines the optimum conditions for de-agglomeration. A commercially available powder was added to propan-2-ol and dispersed using a magnetic stirrer, a high frequency 850 kHz ultrasonic cell, a standard 40 kHz bath and a 20 kHz ultrasonic probe. The particle size of the powder was characte...