ABSTRACT: This article examines one of the most important strokes in tennis sport, namely, service strokes. The study covers three types of strokes: flat, slice, and kick service strokes. A specially made program has been compiled in the area of MatLab, with the help of which the strongly nonlinear differential equations are integrated. These equations

ABSTRACT: The article considers the impact interaction of a railway vehicle with a fixed barrier. The movement of the vehicle is carried out at different velocities. A dynamic model of a buffer is offered, which includes an elastic element, a damper, and a friction mechanism. The elastic element has a nonlinear characteristic. The damper is

ABSTRACT: Bipolar Plates (BPPs) are the most crucial component of the Polymer Electrolyte Membrane (PEM) fuel cell system. To improve fuel cell stack performance and lifetime, corrosion resistance and Interfacial Contact Resistance (ICR) enhancement are two essential factors for metallic BPPs. One of the most effective methods to achieve this purpose is adding a thin

ABSTRACT: Modern tennis sport is characterized by constant change in several directions. The most significant of these changes are connected to the design of tennis rackets. The composite material of the rocket’s frame is continuously improved. It is also working hard on improving the tennis strings. Tennis balls are also being modified. All these innovations

ABSTRACT: The oscillations of a pendulum suspended on an elastic beam are examined. The mathematical pendulum is a material point suspended on an ideal rigid and massless rod. The upper end of the rod is connected by a joint with an elastic beam on two supports. The beam is considered to be perfectly elastic and

ABSTRACT: Modern tennis players use a variety of strokes. From the physical point of view, these shots can be classified into eight main groups depending on the way the racket interacts with the tennis ball. These are strokes with top, bottom, side, top-side, and bottom-side rotation, as well as strokes without rotation. These eight interactions

ABSTRACT: The article examines the three-dimensional vibrations of an elliptical disk. It is rigidly connected to a horizontal cylindrical shaft. The normal axis to the plane of the disk makes an acute angle with the axis of the shaft. The shaft is considered to be a cylindrical perfectly elastic and weightless rod with stiffness of

ABSTRACT: The purpose of the study is to examine the adaptation of coal mining enterprises to the requirements of the Climate Agenda and the prospects for a low-carbon future in the Kuzbass region. The subject of the research is the impact of coal mining on the conservation of the region’s biocapacity and the future “green”