High power ultrasonic effect on soil compaction for different static pressure

Abstract

To analyze the compacting effect of powder by ultrasonic vibration under static pressures applied to the powder, we suggested a new theoretical analysis model and examined the compaction effect of the powder sample. The change of physical properties of the compacted powder assisted with ultrasound is also measured under various static pressures. For the compacted powder assisted with the ultrasonic vibration of 29 kHz under different static pressures, it was confirmed that the density increased by about 3 ∼ 12%, the sound speed increased exponentially from 300 m s −1 to 1100 m s −1 , and the homogeneity is remarkably improved.

Rapid tablet swelling and disintegration during exposure to brightness-mode ultrasound

“…The reflection from the coin is visible at r £ = 1.45 cm in frames a and f. A shift to r £ = 2.02 cm was observed immediately after placement of the tablet, in frames b and g. The value of r £ was observed to decrease with time. After combining the r (t) data for both tablet and coin reflections, Figure 3 was generated using (3). The speed of sound derived for the tablets directly after placement was c (0) ≈ 1 2 c ∼ ∼ ∼ .…”

“…Controlled rapid disintegration of pharmaceutical tablets is of relevance for consistency checks during the manufacturing process. 1) Although not yet considered a default tablet disintegration technology, 1) ultrasound has been of known benefit in compaction 2,3) and monitoring [4][5][6][7] of tablets. Indeed, high-amplitude ultrasonic disintegration of tablets and other solid small structures is feasible, [8][9][10] but the acoustic regimes involved may cause inertial cavitation.…”

“…The experimental setup used for tablet disintegration is shown in Figure 1. It comprised an HPL850 container (LocknLock Co., Ltd., Seoul, Republic of Korea) of 10 × 10 × 5cm 3 dimensions, positioned on the base of a clamp stand. 24) A P30 lite cellphone (Huawei Technologies Co., Ltd., Shenzhen, P.R.…”

Evaluation methods for materials for power ultrasonic applications

“…There are many trials and studies on material and chemical applications, 24) and we can also find a considerable number of papers related to material and chemical processing in the recent special issue on ultrasonics electronics in the Japanese Journal of Applied Physics. [25][26][27][28][29][30][31][32] In acoustically assisted chemical and physical reactions, cavitation plays an important role. [33][34][35] There is a trial to use acoustic streaming for handling liquid metal.…”

Microscopic fractures shown inside tablets after impact

“…Oral pharmaceutical tablets comprise compressed powders. 1) After the pois compaction process, 2) the presence of microscopic gas pockets has been observed inside tablets 3) that are released during disintegration in water. 4) The pulsation behaviour of tablet gas micropockets in an ultrasound field has been associated with rapid ultrasoundassisted tablet disintegration.…”