Ramanamurty M., Santhikumar Rajamahanthi, Sobhanbabu K. «FRW viscous cosmological model with time periodically varying deceleration parameter in f(R,T) gravity» Журнал Сибирского Федерального университета. Математика и физика, 18, № 2, с. 243-252 (2025)

Изучается динамика космологической модели Фридмана–Робертсона–Уокера, характеризующейся давлением идеальной жидкости и баротропным объемным вязким давлением. Получая точные решения уравнений поля Эйнштейна с изменяющимся во времени периодическим параметром замедления, исследование выявляет периодическое поведение большинства параметров, приписываемое влиянию косинусной функции в параметре замедления. Анализ углубляется в физические и динамические следствия этой модели, в частности, подчеркивая, как отрицательное давление способствует расширению Вселенной в поздние времена. Ключевые слова: объемная вязкая жидкость, период времени, параметр замедления, ускоренное расширение.

Borshchan V.S., Rezvov Yu.G., Sivkova O.D. «Manufacture of a converter for surface acoustic waves» Приборы и техника эксперимента, 36, № 2, с. 189-190 (1993)

A converter for excitation of surface acoustic waves in piezoelectric materials is known, for manufacturing which they make a recess on a sound guide’s surface by the method of ion etching. A method for the mechanical fabrication of such a recess is described. By this method, a converter with a central frequency of 10.4 MHz at an excitation effectiveness of 27 db is made from lithium niobate Y+128-section.

Albul V.I., Bychkov V.B., Gusev K.E., Demidov V.S., Demidova E.V., Konovalov S.L., Kurchanov A.F., Luk'yashin V.E., Lyashuk V.I., Novikov E.G., Rostovtsev A.A., Sokolov A.Yu., Feizkhanov U.F., Khaldeeva N.A. «Measurements of the parameters of the acoustic radiation accompanying the moderation of an intense proton beam in water» Приборы и техника эксперимента, 44, № 3, с. 50-57 (2001)

Using the external proton beam of the accelerator at the Institute of Theoretical and Experimental Physics (ITEP), an experiment was performed on recording the acoustic signals accompanying the moderation (up to termination) of an intense proton beam with an energy of up to 200 MeV in water. The signals are damped quasi-periodic oscillations, whose initial period reflects the features of the radiating system. Parameters of the acoustic signal are measured in a wide range of energy release (from 10¹⁶ to 1.2·10¹⁹ eV) for three values of the beam diameter.

Verkhoturov V.I., Grafodatskij O.S., Zhukov V.K., Ekimenko V.Yu., Kargapol'tsev A.V., Rudenko V.N., Simanchuk V.I. «Installation for acoustic sounding of electric fields in dielectric materials» Приборы и техника эксперимента, 34, № 2, с. 186-190 (1991)

The installation was described permitting to study accumulation and relaxation processes of space change and electric field connected with it. The spatial resolution of the installation when using OGM-20 laser was ≈100 μm for polymethylmethacrylate samples. The spatial resolution can be reached to several micrometers due to nanosecond LP-3 lasers, providing the formation in solid state media of acoustic signals of the length up to several nanoseconds and below. In connection with it the investigation of thin (tens-hundreds micrometers) dielectric and polymer films is possible.

Rykov V.V., Kharionovskij A.V. «Photoacoustic method of determination of transparent film thickness» Приборы и техника эксперимента, 35, № 1, с. 202-205 (1992)

Photoacoustic method of determining transparent film thickness within optical range. The method was based on recording interference picture in film transmission spectrum by measuring intensity of passed through the film light by photoacoustic method. Formulae for calculation of elasticity theory were presented. Circuit of measuring device, piezocounter design, curve of spectral dependence of photoacoustic signal were given.