The purpose of this mini-review is to outline diversity of chest wall vibrations, specify biomechanical peculiarities and point out a few problems crucial for development of diagnostic and therapeutic applications of chest wall vibrations. The review considers two types of chest wall vibrations: spontaneous, induced by breathing, and forced (or artificial), induced by external vibration forces....

A number of theoretical models are known for describing longitudinal vibrations a rod. The simplest and most common is based on the wave equation. Next comes model that takes into account lateral displacement (Rayleigh correction). Bishop considered to be more perfect, taking both transverse shear deformation. It would seem perfect model, better it should consistent with experimental data. Neve...

vibration from the operation of industrial implements can be harmful to the human body. these implements, such as the power tiller or hand tractor often used to till rice in northern iran, can vibrate the entire body or one part, particularly the hands. in this research, the transmissibility and effects of vibration from a mitsubishi power tiller of 7.7 hp and 2400 rpm on the operator’s health ...

The change in the magnetic and acoustic properties of nickel as a result cold deformation subsequent annealing is investigated. It was found that leads to very significant changes nickel. coercive force decreases 50 times with an increase temperature 800 °C. Rayleigh coefficient, which characterizes mobility domain walls, monotonically increases by factor 20 over entire investigated range tempe...

It is a wideheld belief that the holes doped into the CuO2 planes of the cuprate superconductors tend to segregate into stripes that separate antiphase antiferromagnetic domains. However, solid evidence for such stripe order was obtained so far only for the particular compound La1.48Nd0.4Sr0.12CuO4 (LNSCO) and the closely related one La1.875Ba0.125CuO4. In these two compounds, nuclear and magne...

Using atomic simulations, we characterize the scattering time, nature, and weight of thermal excitations in example system ${\mathrm{Li}}_{2}\mathrm{S}$ from its amorphous solid state to superionic liquid states. For at 300 K, vibration time was found range a few femtoseconds several picoseconds. As result, both propagons diffusons are main heat carriers contribute largely total conductivity. T...

The ordered arrays of quantum dots have been experimentally created recently. As a result there have been opened the possibility to fabricate and study the physical properties of superlattices consisting of quantum dots with different spatial shapes. The theory of quasiparticles (electron, hole and phonons) in such nanoheterosystems is developed only now [1]. In the proposed paper the influence...

Initiation and maintenance of vibrations of the vocal folds require suitable conditions of adduction, longitudinal tension, and transglottal airflow. Thus manipulation of adduction/abduction, stiffening/slackening, or degree of transglottal flow may, in principle, be used to determine the voicing status of a speech segment. This study explores the control of voicing and voicelessness in speech ...

The purpose of this paper is to study the effect of presence of fluid within and around a poroelastic circular cylindrical shell of infinite extent on axially symmetric vibrations. The frequency equation each for a pervious and an impervious surface is obtained employing Biot’s theory. Radial vibrations and axially symmetric shear vibrations are uncoupled when the wavenumber is vanished. The pr...