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Analysis of Deflection and Cracking of Concrete Beams with Non-Metallic Reinforcement

Abstract

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.

Open access
The Analysis of Selected Relationships Between Human Resource Management Style and the Effectiveness of Knowledge Management

Abstract

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.

Open access
Analysis of the Accidental Release of Chlorine

Abstract

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.

Open access
Analysis of the Design and Implementation Phase of ISO 14001 Environmental Management Systems in Manufacturing Enterprises

Abstract

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.

Open access
Analysis of the Influence of the Heat-Absorbing Surface of an Air-Cooled Solar Collector on its Thermal and Mechanical Properties

Abstract

This paper presents the analysis of existing forms of heat absorbing surfaces of air solar collectors, which gained the greatest popularity in the world. The obtained data allowed to conclude that there is a need for the development of solar collectors with air as a coolant with an improved form of heat absorber, which will reduce the operational and capital costs of solar systems and allow the efficient use of such structures in a moderate climate without additional mechanisms for the transfer of coolant. The use of computer simulation helped to compare the thermal characteristics of air-borne solar collectors of a different design. The substantiation of the expediency of installing as a heat absorber of flow turbulators in the form of a screw has been fulfilled, as well as the height of the air channel of the solar collector has been determined, in which the maximum heating of the transfer medium is observed. In addition, the loss of pressure in the air channel of the solar collector with flow turbulators was determined and the comparison of the obtained data with the values of pressure losses in the air collector of the matrix type and the air collector with V-shaped ribs was made.

Open access
Application of Algorithm of Discipline D2 of G8D Method in Solving Selected Problems of Quality Control Management

Abstract

The G8D method is a universal method for solving problems arising in production processes, also used in optimisation of these processes. The method allows the detection and elimination of any drawbacks occurring in manufacturing processes and ensuring the safety of these processes.

In the article, the authors have presented one of the sensitive and critical disciplines of the G8D problem solving method in production processes, i.e. discipline D2 - “problem description”. The authors have presented the algorithm of procedure in the discipline D2 as well as the quality management tools that can be used to correctly “describe the problem”. The authors have also discussed the procedure for the discipline D2 in the “problem description” for the case of the projection welding of a nut.

Open access
The Application of Business Intelligence Systems in Logistics. Review of Selected Practical Examples

Abstract

The goal of the paper is to present the application of Business Intelligence systems belonging to the area of business analytics in the domain of logistics and particularly indicate its role and meaning in supporting logistics decision making processes. Its content embraces the characteristic of BI systems, its functionality, construction and benefits resulting from its implementation. The paper also presents review of research and case studies connected to the BI usage in such areas of logistics as optimization of supply chain, managerial dashboard design and improvement of business processes.

Open access
Application of Low Carbon Technology in Metallurgy

Abstract

The paper deals with possibilities of low carbon technology application in metallurgy. It sums up the world wide experience with them and presents possibilities of their application in metallurgical production in view of carbon dioxide emission responsible for greenhouse effect and global warming of the Earth. It summarizes research projects in this field and presents the results and conclusion resulting from them. It is aimed at the possibilities of low carbon application in sinter and subsequently in blast furnace process. It presents research on reducibility of metallurgical ekosinter produced with share of biomass in comparison with sample of industrial one. It describes the testing methodology carried out in accordance with ISO 4695:2007. The samples were tested in reduction atmosphere created by 40% CO2 and 60% N2 simulating conditions in blast furnace aggregate at temperature 950°C. The obtained results confirmed better reducibility rate of ekosinter which reached the reduction index (dR/dt) 1.15, in comparison with industrial sinter of reduction index 0.83.

Open access
Assessment and Management of Risk in Improving the OHS Management System

Abstract

The paper discusses options for assessing risks with a view to identifying the nature and scope of the impacts of non-conformities and defining improvement opportunities. Such options are described in terms of hazards and opportunities. The opportunities reflect the measures required to increase the chances of establishing more effective safety management systems. The hazards reflect the circumstances that may prevent organizations achieving the desired benefits and that must therefore be eliminated in the course of system deployment and operation. Once identified, the above will help build the capacity to improve the existing management system in any organization that seeks to systemically modify its occupational safety system. The paper invokes the requirements set forth in ISO 45001, which it cross-references with binding legislation (including Directive 89/391/EEC). The approach helps define the benefits to be derived from assessing risks with a view to identify improvement opportunities and hazards by methods best suited to an organization’s environment.

Open access
Assessment of Employees Level of Awareness in the Aspect of Information Security

Abstract

The strategic importance of information for the functioning of each economic entity forces entrepreneurs to properly protect them against loss, unauthorized disclosure or unauthorized modification. Hence, organizations build complex security systems taking into account state-of-the-art technical solutions, while belittling often the most important element, which is the human factor. It should be emphasized that it is the intentional or accidental actions of the human that can lead to the loss of information security. In addition, it is also the potential of human capabilities and skills can provide an effective defense against the failure or technical security.

The article presents the basic stages of human resource management in the aspect of information security. Complementing these considerations will be the presentation and discussion of the results of surveys aimed at assessing the level of employee awareness in the area of information security.

Open access