The Efiect of a Magnetic Field on the Speed of Temperature Change

The paper presents the micro/nanoscopic model of a material inserted in a magnetic fleld. The model accepts the time component of an electromagnetic fleld from the perspective of relative motion of systems. The relatively moving systems were derived and tested (1), and the in∞uence of the motion on the superposed electromagnetic fleld was proved to exist already at relative motion speeds in the order of units of ms i1 . In micro- and nanoscopic objects such as biological tissues, the efiect of an external magnetic fleld on the growth and behaviour of the biological system needs to be evaluated. We designed the model based on a description using Maxwell's equations of the electromagnetic fleld, and we also extended the monitored quantities to include the various ∞ux densities; moreover, the time ∞ux density ? () was monitored as a quantity. This quantity was then experimentally examined on the physical problem of the speed of heating a deflned volume of a homogeneous material in relation to the magnitude and type of the surrounding magnetic fleld. Experiments were conducted with growth properties of simple biological samples in pre-set external magnetic flelds. When the temperature in animal cells and organisms containing water drops below 0§C, the water will freeze, resulting in the death of the living structures. Experiments performed on living organisms show that the magnetic fleld reduces the efiects of hypothermia afiecting the cells of these living organisms and decreases the mortality in the cells. This fact is caused by a large number of in∞uences, which include the efiect of the external magnetic fleld, its form, and distribution over the space in which the microscopically conceived system is located. Due to the efiect of the external magnetic fleld, the hypothetical particles of the model of the system (a homogeneous material, a heterogeneous structure | biological units | a cell, .) change their dynamics, thus changing the entire microscopically interpreted system. This paper analyzes the in∞uence of a magnetic fleld on inanimate objects. Using physical parameters, we created a mathematical model which describes the rate of temperature change in the deflned material sample. Experimental measurement of the temperature change of a copper sensor in a stationary homogeneous and gradient magnetic fleld was performed. Up to 10 times, the sample was cooled down to the nitrogen boiling point (i195:80§C to 77.35K); at the pre- selected time, the sample was then removed and placed in an area where it was heated to the temperature of i20§C. Using the measuring centre and 4 temperature sensors (2 sensors measuring the temperature of the sample and 2 others for the measurement of the ambient temperature), we recorded the temperature change in the sample and the time required to heat it. This experiment was repeated in the presence of two magnetic flelds. The results of the experiment were consistent with the mathematical model and contribute to the description of physical processes during the cooling of the biological tissues. 2. MODEL OF THE ELECTROMAGNETIC FIELD AND PARTICLES For the model with distributed parameters of the electromagnetic fleld, it is possible to use partial difierential equations based on the theory of the electromagnetic fleld to formulate a coupled model with concentrated parameters (in our case, particles). The model scale at the level of nanometers was also determined using the partial difierential equations. The forces acting on a moving electric charge in the electromagnetic fleld can be expressed by means of the formula