ABSTRACT
The study's research question in the broader context of the fight against the pandemic is the impact of disinfectants on selected surfaces of materials used in air transport. The main scientific goal of this work was to verify the assumption that disinfectant solutions cause degradation of mechanical and physical properties, i.e., chemical aging, in samples from airport conveyors, and to determine the degree of change in the properties of the samples depending on the time spent in solution and on aging. The research methodology was developed based on the ISO 1817: 2011 standard, STN EN ISO 868, and the ISO 283 standard, and applied infrared spectroscopy, specifically the Attenuated Total Reflectance method. Research suggests that constant disinfection of baggage handling systems will require the replacement of carrying parts. Otherwise, there will be significant costly breakdowns (damage to luggage, interruption of its flow, delays/inability to check in the aircraft, and the resulting legal consequences). The longer the samples were left in the disinfectant solution, the higher and more uneven the degradation. The hardness of the samples changed after immersion but was not directly proportional to the change in tensile properties. During disinfection, chemical changes occurred, which varied in length and effect depending on the disinfection used. © 2022 by the authors.
ABSTRACT
The paper deals with development of an artificial lung ventilation. The aim of the paper is to present developed ventilator based on bag-valve-mask, which could be used as alternative to mechanical ventilator in critical situations related to COVID-19. At first, we present basic principles of positive pressure ventilation. Subsequently, we introduce a requirements to emergency mechanical ventilator in order to be suitable alternative in hospitals as well as in households. The mechanical and control design are presented in the next section. Finally, we experimentally verify developed ventilator with focus on measured pressure of patient airways. The presented results show a potential of developed ventilator to be used at practical level.
ABSTRACT
Research has been conducted on the current problem of developing a methodology for determining the level of process control in complex systems, taking into account risk-oriented factors influencing it. For the first time, the study proposes stages of risk management in the process of assessing the level of controllability of complex systems, formalizes the input data used to assess risks using fuzzy models for various complex systems, constructs generalized step-by-step algorithms for risk-oriented assessment of controllability in complex systems. An experimental approbation has been made of the research on the problem of determining the level of process control in the airline system, taking into account risk-oriented factors influencing it. The study will be a useful tool to support decision-making to improve process control in various complex systems by taking into account the risks and threats to its operation for managers from safe time to pandemics as COVID-19. © 2021 Copyright for this paper by its authors.