Rafat A., Rahman M.M., Alam M.S., Mamun A.A. «Effects of nonextensivity on the electron-acoustic solitary structures in a magnetized electron-positron-ion plasma» Физика плазмы, 42, № 8, с. 768-774 (2016)

DOI: 10.7868/S0367292116080096

Бойко Ю.С., Шашурин А.Е., Cardona J., Albaladejo M. «Исследование процессов шумообразования при движении высокоскоростных поездов» Noise Theory and Practice (Электронный ресурс), 1, № 2, с. 84-89 (2015)

Рассматривается процесс шумообразования при проезде высокоскоростного поезда. Представлены методика и результаты измерений, проведенных на железной дороге Испании Renfe на поездах серии AVE 103 при скорости движения 300 км/ч. Предложен учет скорости возрастания звука для оценки степени воздействия звукового события на человека и увеличенный интервал продолжительности звукового события для определения эквивалентного уровня звука.

Mukharlyamov R.G., Amabili M., Garziera R., Riabova K. «Stability of non-linear vibrations of doubly curved shallow shells» Вестник Российского университета дружбы народов (РУДН). Серии Математика. Информатика. Физика, № 2, с. 53-63 (2016)

Large amplitude (geometrically non-linear) vibrations of doubly curved shallow shells with rectangular boundary, simply supported at the four edges and subjected to harmonic excitation normal to the surface in the spectral neighborhood of the fundamental mode are subject of investigation in this paper. The first part of the study was presented by the authors in [M. Amabili et al. Nonlinear Vibrations of Doubly Curved Shallow Shells. Herald of Kazan Technological University, 2015, 18(6), 158-163, in Russian]. Two di?erent non-linear strain-displacement relationships, from the Donnell’s and Novozhilov’s shell theories, are used to calculate the elastic strain energy. In-plane inertia and geometric imperfections are taken into account. The solution is obtained by Lagrange approach. The non-linear equations of motion are studied by using (i) a code based on arc length continuation method that allows bifurcation analysis and (ii) direct time integration. Numerical results are compared to those available in the literature and convergence of the solution is shown. Interaction of modes having integer ratio between their natural frequencies, giving rise to internal resonances, is discussed. Shell stability under dynamic load is also investigated by using continuation method, bifurcation diagram from direct time integration and calculation of the Lyapunov exponents and Lyapunov dimension. Interesting phenomena such as (i) snap-through instability, (ii) subharmonic response, (iii) period doubling bifurcations and (iv) chaotic behavior have been observed.

Azimi M. «Noise mitigation in buildings using sound absorbing materials» Noise Theory and Practice (Электронный ресурс), 1, № 1, с. 12-16 (2015)

Noise, generally defined as undesirable sound, is characterized in terms of the pressure of the sound wave. The improvement on the human quality of life and the continuous growth in population in developing and developed societies, have exacerbated the environmental and financial issues. Some of these problems are noise and the different types of human an industrial wastes. Many natural products have been recently developed and tested for acoustic applications. Sound-absorbing materials absorb most of the sound energy striking them and reflect very little. Therefore, sound-absorbing materials have been found to be very useful for the control of room noise. In this study, sound absorption technology as an effective noise reduction technology buildings using sustainable acoustic absorbers, will be discussed.