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The work is devoted to the study of the theoretical value of destructive influence on normal tissues of an organism by infrared radiation that goes beyond the treated pathological focus. This situation is possible if the direct laser radiation on the tissues is extremely long-acting. The solution to this problem can be the uniform distribution of heat inside the volume through indirect heating of the liquid, which contributes to minimal damage to the perifocal structures. A non-stationary thermophysical model of the process of heat propagation in biological tissues is presented, allowing to carry out studies of energy transfer from internal liquid contents of Baker's cyst heated by infrared laser radiation of a given specific power through a certain thickness of its wall to surrounding biological tissues. Calculation of the spacetime temperature distribution in the cyst wall and surrounding fat tissue is carried out by the finite-difference method. The time of effective exposure to temperature on the entire thickness of the cyst wall was estimated to be 55 ° C on its outer surface. The safety procedure ensures the exposure duration of this value is not more than 10 seconds.

As a result of the calculations carried out, it is established that there are several operating modes of a surgical laser that meet all the safety requirements with a simultaneous effective procedure. Local one-sided hyperthermia of the synovial membrane and subsequent coagulation of the entire wall thickness due to heat transfer contributes to the elimination of the cavity neoplasm of the popliteal region. With a thickness of 3 mm, the heating mode is satisfactory, under which the exposure time lasts about 200 seconds, and the specific power of the laser radiation in the internal medium of the liquid contents of the Baker cyst is approximately 1.

The results of determination of the risk of cardiovascular failure of young athletes and adolescents in stressful physical activity have been demonstrated. The method of screening diagnostics of the risk of developing heart failure has been described. The results of contactless measurement of the form of the pulse wave of the radial artery using semiconductor laser autodyne have been presented. In the measurements used laser diode type RLD-650 specifications: output power of 5 mW, emission wavelength 654 nm. The problem was solved by the reduced form of the reflector movement, which acts as the surface of the skin of the human artery, tested method of assessing the risk of cardiovascular disease during exercise and the analysis of the results of its application to assess the risk of cardiovascular failure reactions of young athletes. As analyzed parameters were selected the following indicators: the steepness of the rise in the systolic portion of the fast and slow phase, the rate of change in the pulse wave catacrota variability of cardio intervals as determined by the time intervals between the peaks of the pulse wave. It analyzed pulse wave form on its first and second derivative with respect to time. The zeros of the first derivative of the pulse wave allow to set aside time in systolic rise. A minimum of the second derivative corresponds to the end of the phase and the beginning of the slow pressure build-up in the systole. Using the first and second derivative of the pulse wave made it possible to separately analyze the pulse wave form phase of rapid and slow pressure increase phase during systolic expansion. It has been established that the presence of anomalies in the form of the pulse wave in combination with vagotonic nervous regulation of the cardiovascular system of a patient is a sign of danger collapse of circulation during physical exercise.

Modeling the fight against terrorist, pirate and robbery acts at sea is an urgent scientific task due to the prevalence of force acts and the insufficient number of works on this issue. The actions of pirates and terrorists are diverse. Using a base ship, they can attack ships up to 450–500 miles from the coast. Having chosen the target, they pursue it and use the weapons to board the ship. Actions to free a ship captured by pirates or terrorists include: blocking the ship, predicting where pirates might be on the ship, penetrating (from board to board, by air or from under water) and cleaning up the ship’s premises. An analysis of the special literature on the actions of pirates and terrorists showed that the act of force (and actions to neutralize it) consists of two stages: firstly, blocking the vessel, which consists in forcing it to stop, and secondly, neutralizing the team (terrorist groups, pirates), including penetration of a ship (ship) and its cleaning. The stages of the cycle are matched by indicators — the probability of blocking and the probability of neutralization. The variables of the act of force model are the number of ships (ships, boats) of the attackers and defenders, as well as the strength of the capture group of the attackers and the crew of the ship - the victim of the attack. Model parameters (indicators of naval and combat superiority) were estimated using the maximum likelihood method using an international database of incidents at sea. The values of these parameters are 7.6–8.5. Such high values of superiority parameters reflect the parties' ability to act in force acts. An analytical method for calculating excellence parameters is proposed and statistically substantiated. The following indicators are taken into account in the model: the ability of the parties to detect the enemy, the speed and maneuverability characteristics of the vessels, the height of the vessel and the characteristics of the boarding equipment, the characteristics of weapons and protective equipment, etc. Using the Becker model and the theory of discrete choice, the probability of failure of the force act is estimated. The significance of the obtained models for combating acts of force in the sea space lies in the possibility of quantitative substantiation of measures to protect the ship from pirate and terrorist attacks and deterrence measures aimed at preventing attacks (the presence of armed guards on board the ship, assistance from warships and helicopters).