The recent interpretation of the phonon-roton excitations in superfluid He as a density mode at low wave vector and a quasiparticle excitation at higher Q proposed by Glyde and Griffin is developed. When there is a condensate, no( T ), the quasiparticle response of liquid He, becomes a component of the observed density dynamic structure factor, S(g, to). The quasiparticle and density response f...

Objectives: Different chelators may be used during root canal treatment, offering various advantages including lubricant effect inside the canal and smear layer removal. However, chelator residues in narrow root canals can lead to apical microleakage. The aim of this in-vitro study was to compare apical microleakage following the use of three root canal chelators via fluid filtration method in ...

We report dynamical calculations for large-q structure functions of liquid He at T51.6 and 2.3 K and compare those with recent MARI data. We extend those calculations far beyond the experimental range q<29 Å in order to study the approach of the response to its asymptotic limit for a system with interactions having a strong short-range repulsion. We find only small deviations from theoretical 1...

objectives: different chelators may be used during root canal treatment, offering various advantages including lubricant effect inside the canal and smear layer removal. however, chelator residues in narrow root canals can lead to apical microleakage. the aim of this in-vitro study was to compare apical microleakage following the use of three root canal chelators via fluid filtration method in ...

High-resolution neutron inelastic scattering studies of the wavevector and temperature dependence of the excitation spectrum of 4He in the superfluid and normal-fluid phases have been made in the wavevector region ‘beyond the roton’, 2.0 < Q < 3.6 Å−1, at a pressure of 20 bar. The scattering in this region exhibits two separate components: a sharp peak at low energies and a broader continuum at...

Aim and Objective: Endodontic retreatment is indicated in the event of a failure initial treatment root canal an that looks to be correctable with retreatment. This in-vitro study was designed assess efficacy passive ultrasonic irrigation endodontic retreatment, by employing scanning electron microscopes, on cleanliness dentine tubules without solvent curved channels. Material method: Sixty hum...