The paper deals with the working peculiarities of the support zones of reinforced concrete elements subject to bending with due account of the eccentric compression and tension. The authors performed simulation of the stress-strain behaviour of the indicated structures with the aid of “Lira” software which results are shown in the graphical and tabulated form. The performed simulation allowed of tracing the work of the studied sample beams till collapse. Such approach made it possible to single out and generalize the main collapse patterns of the inclined cross-sections of the reinforced concrete elements subject to bending on which basis the authors developed the improved method to calculate their strength (Karpiuk et al., 2019).
Currently, the industry is called as Industry 4.0, Internet of Things, Industrial Internet of Things, where devices, machines, information, organizations and people are connected to the network. Every day meet new solutions for Industry 4.o can be met, but in parallel with these solutions there are also threats in the field of security of industrial networks. Such threats have been called cyber-attacks or cyber threats. Cybersecurity is the global name of a field aimed at counteracting all types of threats on the web. Cybersecurity is to raise awareness, inform, control and introduce solutions to counteract cyber threats. Enterprises, organizations dealing with the promotion of Industry 4.0, IoT, IIoT, form the appropriate groups, departments, companies whose goal is to counteract all types of cyber-attacks. At present, the thesis can be formulated that cybersecurity of the broadly understood network is more important than the implementation of Industry 4.0. The publication will attempt to present the threats that cybersecurity enterprises must face and the ways and methods to counter them.
The paper presents the analysis of navigation processes used in wells and around-drilling processes. Most common navigation systems used in drilling processes are described. The authors have presented a concept of applying navigation to operations supporting drilling processes, including operations ensuring the safety of drilling staff. Also, they have discussed around-drilling processes which have not been supported by navigation systems. Finally, they have presented ideas of their possible applications as well as benefits resulting from using navigation systems.
Identification of trends of the examined phenomenon plays a major role in taking decisions and allows conducting a deeper analysis of phenomena connected with the shaping of proper working conditions. One of the result indicators in the OSH system is the accident rate, whose existence is the result of a combination of various events. Seeking tangible economic benefits, decision makers in business entities who wish to improve activities protecting health and life of employees, pay great attention to using quantitative methods and drawing conclusions from them. This is conditioned by the fact that the analysis of the economic aspects of accidents is connected to a large extent with the cost of benefits the employer incurs for the benefit of accident victims. Therefore, the main goal of the article is to examine what impact on the cost of benefits due to accidents at work is exerted by such factors as: the number of related benefits, persons injured in accidents at work depending on the consequences and the number of days of inability to work caused by these accidents. Furthermore, this paper shows changes in costs of accident benefits of persons receiving those benefits due to inability to work caused by accident in business. In order to achieve this, it is proposed to present an econometric analysis based on the cross-section-time data with the dynamics of considered variables in voivodeships in Poland being examined. The study uses the annual data for the years 2010-2017. The data come from the CSO publications.
The composite bars have become a useful substitute for conventional reinforcement in civil engineering structures for which load capacity and resistance to influences of environmental factors' are required. Considering the requirements of responsible design of engineering structures with particular emphasis on durability, the use of non-metallic reinforcement in reinforced structural elements allows to reduce the costs related to erection of buildings, as well as the costs of building maintenance and renovations. The behaviour of model beams made of concrete reinforced with composite bars (fiber reinforced polymer bars) in three-point bending test was analyzed. The strength parameters of composite bars were tested. The bending capacity, deformation of concrete, and beam deflection were determined. Crack propagation in the model beams under load was analyzed using the Aramis 5M optical measuring system. Due to the strength characteristics of the composite reinforcing bars, the beams exhibited significant tensile strains, which resulted in the development of cracks of considerable width.
The creation, dissemination and use of knowledge depends on many factors related to both the specificity of the enterprise, the type of organizational solution, the style of human resource management used, the potential of employees and, above all, the ability of the company to use this potential. From the point of view of efficiency of acquiring, disseminating and using knowledge in the enterprise, human resources management is of key importance. Methods and techniques used in this area should be thoroughly analyzed and critically evaluated in terms of their relevance and real positive impact on knowledge management. This study attempts to analyze selected issues related to the company’s management style, the existing variant of the organizational structure and the general assumptions of the knowledge management system. The main goal of the study was to identify trends and dependencies between these factors in the context of knowledge management effectiveness. The study used a questionnaire consisting of 63 questions. In individual companies the questionnaire was each time filled in by the representative of the company’s top management. The study presents a part of the examined issues directly related to the indicated topic based on data obtained from 105 enterprises.
Due to its properties, chlorine is one of the highly toxic substances used by humans. This gas attacks the respiratory system, eyes and skin. In higher concentrations, its inhalation leads to death. It is mainly used in water treatment plants where it guarantees a bacteriologically safe water in water supply systems. It is also used as a disinfectant and bleaching agent.
The use, transport and storage of chlorine may pose serious hazard associated with its uncontrolled release from technological installations or tanks. The level of this threat will depend on the run of the release scenario or meteorological conditions. The article presents an analysis of the hazards associated with the uncontrolled release of chlorine. The ranges of zones with dangerous level of gas concentration are presented as a result of its instantaneous and continuous release.
Increasing awareness and the number of activities for environmental protection has influenced the development of environmental management systems. Currently, there is a wide range of environmental management systems that can be implemented thus organizations can choose which system suits their activities best. Among small and medium-sized manufacturing enterprises, the most popular is a system based on the ISO 14001 standard. Therefore, it seems advisable to promote the skillful implementation of this system. The study was devoted to this issue. It pointed out that the participation of an external consultant, the size of the enterprise as well as the nature of the activity in small and medium manufacturing enterprises has a small importance at the time of its implementation. To implement such a system skillfully, preparation work period for designing and implementing should last about 9 - 12 months.