Recent achievements of nonlinear acoustics concerning the realization of solitons and solitary waves in crystals and their surfaces attained by nanosecond and picosecond laser ultrasonics are discussed and compared. The corresponding pump-probe setups are described, which allow an all-optical contact-free excitation and detection of short strain pulses in the broad frequency range between 10 MH...

Polymers are increasingly being used in higher demanding applications due to their ability tailor the properties of structures while allowing for a weight and cost reduction. Solvents play an important role manufacture polymeric since they allow reduction polymer’s viscosity or assist with dispersion fillers into polymer matrix. However, incorrect removal solvent affects both physical chemical ...

during endodontic treatment, clinicians may face endodontic procedural mishaps such as broken instruments, which is a complex situation especially when the file breaks beyond the apex. this condition is associated with potential risk of contamination, which compromises the healing process. management of a broken instrument beyond the apex is difficult and time consuming and requires creativity ...

AIM To establish a nutrient-stressed multispecies model biofilm and investigate the dynamics of biofilm killing and disruption by 1% trypsin and 1% proteinase K with or without ultrasonic activation. METHODOLOGY Nutrient-stressed biofilms (Propionibacterium acnes, Staphylococcus epidermidis, Actinomyces radicidentis, Streptococcus mitis and Enterococcus faecalis OMGS 3202) were grown on hydro...

A broad overview of laser-ultrasonics, which is a technique for non-contact generation and detection of ultrasound is presented. The principles of generation and detection are outlined, stressing a few key characteristics of laser-ultrasonics: the material is actually the emitting transducer and transduction is made by light, thus allowing generation and detection at a distance. These features ...