This paper investigates the influence of suction on the flow, heat and mass transfer characteristics over a permeable shrinking sheet immersed in a doubly stratified micropolar fluid. The model which consists of partial differential equations is converted into a set of nonlinear equations using similarity transformations and then solved using the bvp4c solver. Numerical results obtained are presented graphically for the distributions of velocity, angular velocity, temperature and concentration profiles within the boundary layer for various values of the magnetic parameter and wall mass su
The article deals with an analysis of magnetic fields of electric machines and electromagnetic devices on the basis of their circuit mathematical models. The magnetic systems of electrical devices in these models are presented in the form of planar nonlinear magnetic circuits with lumped elements. The parameters of these elements are determined on the basis of geometric dimensions taking into account the design features of the devices and the physical parameters of the environment.
The current state and prospects of the development of cyber-physical systems for the conversion of energy of mechanical motion into electric energy have been analyzed; the design scheme of the mechanical energy conversion of the rolling parts of the artillery cannon into electrical energy has been developed; the initial characteristics of the linear generator have been analyzed; a mathematical model of the electromechanical converter has been outlined.
The aim of this research is to detect the connection between geomagnetic and radon anomalies in the area of Kyiv Ukraine, studying the geoecological situation of the territory, and assessing its ecological safety. Geomagnetic and radon abnormal fields are significant geophysical factors of the environment, which largely determine the ecological state.
In this work, the results of pad welding with the circularly rotating arc existing in an inert gas between a circle cathode with the diameter suitable to dimensions and geometry of a welded surface, with the kinematic characteristics of the motion provided (with the rest equal conditions) by the external magnetic field, are considered.
Determination of space-temporal structure of the magnetic field of Earth’s (MFE) on its surface and in fellow creature space is extremely necessary and actual, in connection with its influence on the character of passing of processes in magnetosphere and ionosphere, and on machineries and size of magnetic activity, which are considered as a substantial ecological factor.
Purpose. The aim of this work is to trace large structural-tectonic elements within the Western region of Ukraine according to the characteristic signs of their manifestation in the anomalies of gravity and magnetic fields and the construction of regional tectonics schemes based on gravity and magnetometric materials. Methodology. The research method is based on a qualitative interpretation of the observed gravitational and magnetic fields.
A complete model of the induction shrink fit between a disk and shaft is presented. The model consists of a proposal of appropriate interference, checking the von Mises stress in the disk and shaft, mapping of the process of induction heating and determining the release revolutions. The methodology is illustrated by a typical example.
The paper deals with the investigation of electro-physical properties of Si1-xGex whiskers; the possibility of their use as sensitive elements in magnetic field and temperature sensors is considered. The possible ways of improving the output characteristics of these sensors, particularly through the use of a measuring system with digital signal processing.
The article regards the definition of the energy charge of a big strained bubble which arises during vibrating hydrocavitation. A series of studies to determine the changes in water properties under the simultaneous effect of both, magnetic field and hydrocavitation, are carried out. The design of vibrating units of various technological purposes is proposed.