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Detalles de la revista
Formato
Revista
eISSN
2353-737X
Publicado por primera vez
20 May 2020
Periodo de publicación
1 tiempo por año
Idiomas
Inglés

Buscar

Volumen 114 (2017): Edición 10 (October 2017)

Detalles de la revista
Formato
Revista
eISSN
2353-737X
Publicado por primera vez
20 May 2020
Periodo de publicación
1 tiempo por año
Idiomas
Inglés

Buscar

20 Artículos
Acceso abierto

Modern green technologies and solutions in landscape architecture

Publicado en línea: 29 May 2020
Páginas: 5 - 13

Resumen

Abstract

The paper presents modern technological solutions used in landscape architecture, with special emphasis on their occurrence in the areas of historical greenery. Dynamic introduction of new tools allows us to take special care of valuable areas, stressing their importance and at the same time granting them new functions. The latter part discusses a specific example of this type of solutions from the area of Katowice. These are modern developments that make the historic pattern of industrial city more legible.

Palabras clave

  • modern technologies
  • landscape architecture
  • Katowice
Acceso abierto

Contemporary art in the historic landscape

Publicado en línea: 29 May 2020
Páginas: 15 - 22

Resumen

Abstract

The paper discusses the subject of the introduction of modern forms into spaces of a historical character, mainly into historical gardens. Its aim is to present the general tendencies, causes and scope of the introduction of modern art into these types of interiors, the problem of their interference with historical tissue, its scope and goal, along with an outline of general guidelines for these types of projects.

Palabras clave

  • historical gardens
  • art
  • contemporary art
  • monument preservation
  • exhibition design
Acceso abierto

Contemporary spatial composition of historic architectural-garden systems and urban parks in the area of warsaw escarpment in the district mokotów in warsaw

Publicado en línea: 29 May 2020
Páginas: 23 - 34

Resumen

Abstract

The article presents the contemporary spatial transformations of valuable architectural-garden systems and urban parks shaped in the area of Warsaw Escarpment in the district Mokotów in Warsaw: residential complex Królikarnia and Park Arkadia, residential complex Mokotów and Dreszer Park. Contemporary spatial composition of the complexes refers to carefully composed landscape of original projects, which emphasized the most valuable characteristics of the place, but also indicate many spatial transformations of study areas as well as the areas located in the immediate vicinity. These transformations are both positive and negative. Among the positive changes it is necessary to mention contemporary attempts of shaping and use of public spaces in parks and complexes, together with the processes of revalorization of different elements.

Palabras clave

  • composition
  • urban park
  • public space
  • Warsaw Escarpment
Acceso abierto

Contemporary development concepts for the escarp of the pomeranian dukes’ castle in szczecin

Publicado en línea: 29 May 2020
Páginas: 35 - 44

Resumen

Abstract

The Pomeranian Dukes’ Castle in Szczecin forms one of the most characteristic elements of Szczecin’s cityscape. That is why it is extremely important to expose its values properly, to stress the solid of the castle in the city panorama, according to its historical condition. Modern concepts for development of the northern castle escarp do not always meet the above expectations, both when it comes to composition and the very geotechnical safety of the escarp. The contemporary concepts for the development of northern escarp of the Castle Hill in Szczecin were presented in the paper, on the background of the complex historic, compositional and also technical conditions.

Palabras clave

  • revalorization of historic gardens
  • castle gardens
  • Pomeranian Dukes’ Castle in Szczecin
Acceso abierto

Shaping of the living environment of the elderly and its relations with the surrounding areas upon the example of copenhagen

Publicado en línea: 29 May 2020
Páginas: 45 - 56

Resumen

Abstract

This paper demonstrates the possibilities of shaping of the living environment of the elderly in connection with the existing urban tissue according to the principle of inclusion in the space used together with the younger generation.The subject matter of the analysis are selected examples of Danish architectural and urban projects implemented in Copenhagen over the last decade. Denmark is one of the leading European countries in terms of its policy towards seniors and shaping of the living environment of elderly people.

Palabras clave

  • architecture
  • urban design
  • living environment of the elderly
Acceso abierto

On the creation of a social conceptual design of a public park – notes on a design employing the workshop method based on the case of reduta park in krakow

Publicado en línea: 29 May 2020
Páginas: 57 - 68

Resumen

Abstract

The paper, in the form of a descriptive analysis, presents the method of designing a public park through the use of workshops. The structure of the entirety of the design, as well as important elements that a tutor – a specialist responsible for the animation of a group of members of the local community – should focus on, are presented in the work.

Palabras clave

  • city park
  • participation
  • a social conceptual design of a park
  • tutor
  • workshops
Acceso abierto

Investigation of temperature distribution in the ground induced by heat source and under natural conditions

Publicado en línea: 29 May 2020
Páginas: 69 - 77

Resumen

Abstract

This paper deals with theoretical and experimental analysis of heat transfer in the ground. Calculation results of heat transfer under natural conditions were presented. Temperature profiles in the ground were determined for cyclic steady state. Results of experimental studies conducted in laboratory setup were shown. Experimental studies were related to determination of temperature of the heated granular bed. The calculation and measurement results presented were used to determine a mathematical model of the ground heat exchanger.

Palabras clave

  • process modelling
  • transient heat conduction
  • renewable energy sources
Acceso abierto

Production engineering tools for civil engineering practice – the case of QFD

Publicado en línea: 29 May 2020
Páginas: 79 - 84

Resumen

Abstract

This article is a part of a series of papers which discuss the usefulness of production engineering tools for general civil engineering. Applications of selected production engineering tools in civil engineering are presented in these papers. The diverse nature of the tools is considered while outlining detailed areas of their application in civil engineering. The features of the tools make them representative of production engineering methodology. Thus, information about the civil engineering applications of the tools also makes it possible to draw practical conclusions about the general usefulness of production engineering methodology in civil engineering. The applications of quality function deployment (QFD) are utilised in this regard in the article.

Palabras clave

  • civil engineering
  • construction
  • decision
  • support
  • production engineering
  • tool
  • application
  • QFD
Acceso abierto

Production engineering tools for civil engineering practice – the case of FMEA

Publicado en línea: 29 May 2020
Páginas: 85 - 92

Resumen

Abstract

This article is the first of a series of papers which discuss the usefulness of production engineering tools for general civil engineering. Applications of selected production engineering tools in civil engineering are presented in these papers. The diverse nature of the tools is considered while outlining detailed areas of their application in civil engineering. The features of the tools make them representative of production engineering methodology. Thus, information about the civil engineering applications of the tools also makes it possible to draw practical conclusions about the general usefulness of production engineering methodology in civil engineering. The applications of failure mode and effect analysis (FMEA) are utilised in this regard in the article.

Palabras clave

  • civil engineering
  • construction
  • decision
  • support
  • production engineering
  • tool
  • application
  • FMEA
Acceso abierto

The concept of the composition of self-compacting concrete with low hardening heat

Publicado en línea: 29 May 2020
Páginas: 93 - 101

Resumen

Abstract

This paper presents a proposal for shaping the properties of green self-compacting concrete, mostly focussing on minimising the amount of clinker in concrete and obtaining lower hardening temperatures. The main application of this SCC would be in constructions build during summer, as well as in massive and semi-massive structures. In these kinds of constructions, thermal effects connected with cement hydration are of particular importance. The difference in temperature between the interior and the relatively fast cooling exterior of the concrete element leads to thermal stress. In extreme conditions, this can cause cracking within the entire bulk of concrete element, leading to a lowering of its durability and longevity.

Palabras clave

  • self-compacting concrete
  • heat of hydration
  • massive structures
Acceso abierto

An overview of selected methods for the identification and qualitative assessment of risk factors

Publicado en línea: 29 May 2020
Páginas: 103 - 111

Resumen

Abstract

The problematic nature of the identification and assessment of the risk factors is a familiar subject area. As a result of this, many scientists are continually attempting to modify existing methods and develop new approaches to achieve this objective. Therefore, it is recommended to periodically review the methods used – this reveals areas of knowledge in this area which remain undeveloped and also determines which methods can complement or verify each other. In this article, current methods for the identification and qualitative assessment of risk factors are described and compared in a tabular manner; the author also proposes potential approaches for the modification and improvement of these methods.

Palabras clave

  • risk management
  • qualitative analysis
Acceso abierto

The influence of foundation for the initiation and growth of the landslidein the carpathian flysch

Publicado en línea: 29 May 2020
Páginas: 113 - 121

Resumen

Abstract

The southern part of Poland is mostly covered by Carpathian mountains. Carpathian Flysch is especially predisposed for the landslides type of the subsoil. Around 98% of all occurring in the country landslides are located in Carpathians. Many of them became active in May 2010, when periodically dormant landslides and new landslide were activated after intensive rainfall. In addition to the main causes of landslides such as rainwater and its infiltration into the ground layers also the Carpathian Flysch tectonic construction (rock layers collapsing in one direction, with numerous jumps and discontinuity) and some anthropogenic influences (loading, slopes undercutting, improper dehydration, etc.) are typical triggering factors. Landslide activity contributes not only to a significant progress of the relief to which occur, but it also carries devastating consequences for the population living nearby. Landslides are a natural threat for economic activities and people’s lives. They are the cause of the damage not only residential buildings but also road and railways and other infrastructure. The landslide analysed here is located in Tymbark, Limanowa district. This article discusses the influence of the building foundation for initiation and growth of the landslide zone in the Carpathian Flysch. Two types of foundations are analysed – base plate foundation and a continuous footing. In both cases, there is a high risk to occur slip zones (FoS < 1.5). Base plate turns out to be more favorable foundation in this subgrade conditions. Although the displacements are relatively larger than in the other case, slip zone is located quite shallow. In the case of the continuous footing, landslide may form deeper reaching the bedrock.

Palabras clave

  • landslides
  • Carpathian flysh
  • numerical model
  • stability analysis
  • MIDAS
Acceso abierto

An environmental life-cycle assessment of selected concrete recycling processes

Publicado en línea: 29 May 2020
Páginas: 123 - 130

Resumen

Abstract

Social and economic development trends require that the economy be based on sustainable consumption and sustainable production patterns by means of implementing an effective recirculation policy – this is also important from an environmental perspective. Consequently, the design of economic processes becomes increasingly complex. This paper presents method and results of environmental life-cycle assessment of selected stages of the concrete recycling process. The results will be used in a further, holistic assessment of managing the concrete waste on the construction site.

Palabras clave

  • LCA
  • RCA
  • sustainable construction
Acceso abierto

Empirical research of human-weapon system

Publicado en línea: 29 May 2020
Páginas: 131 - 139

Resumen

Abstract

Rapid firing of the Skorpion vz.61 machine gun was registered at a police shooting range. The shooting was executed by a policeman from the secret service. The registration was done with the use of a fast digital camera Phantom v9.1 together with the necessary equipment. With the use of the specialised TEMA software, which serves to analyse the recorded image, the courses of the variation of kinematic quantities characterizing the weapon movement were obtained. On the basis of the courses of the variation of the displacement, velocity and acceleration over time, the behaviour of the machine gun in thirteen characteristic points of its operation was specified.

Palabras clave

  • weapon
  • human
  • registration of firing
  • kinematics of movement
Acceso abierto

Matrix FMEA analysis with cause-effect diagram for selected fluid power component

Publicado en línea: 29 May 2020
Páginas: 141 - 146

Resumen

Abstract

This paper presents an application of matrix FMEA analysis and cause-effect diagram for a double acting hydraulic cylinder. A decomposition of the investigated cylinder has been made and main functions and potential failures for the pair-function relation have been identified. Elements with the greatest probability of failure and cause-effect relationship have been determined.

Palabras clave

  • FMEA
  • cause and effect diagram
Acceso abierto

Modelling of a pneumatic cushion in matlab-simulink system

Publicado en línea: 29 May 2020
Páginas: 147 - 154

Resumen

Abstract

The paper addresses modelling, simulation and experimental research of a pneumatic cushion. The scope of work included formulating a mathematical model based on air flow equations, building simulation model, carrying out simulations and comparing simulation results with experiments. The simulations were performed in Matlab-Simulink system, while experiments were carried out on a test bench, by means of a real industrial pneumatic cushion. The comparison of the results indicates that the created simulation model is accurate and flexible, and thus can be used in further research which concerns e.g. geometrical modifications or optimization of air consumption.

Palabras clave

  • pneumatic cushion
  • modelling
  • simulation
  • Matlab-Simulink
Acceso abierto

The effect of selected natural fillers on the mechanical properties of low-density polyethylene

Publicado en línea: 29 May 2020
Páginas: 155 - 166

Resumen

Abstract

The popularity of using natural waste products in different branches of industry, including polymer processing, results from the emphasis of international nature conservation organizations on ecological and environmental problems, such as recycling, storage and the disposal of waste products. This paper investigates the effect of two natural fillers: wheat bran and pumpkin seeds obtained from food industry waste products, on selected mechanical properties of LDPE molded pieces. The polymer blends are examined with respect to their basic mechanical properties and microstructure.

Palabras clave

  • natural waste material
  • mechanical properties
  • wheat bran
  • pumpkin seeds
Acceso abierto

Simulation studies on ring upsetting using the ABAQUS software

Publicado en línea: 29 May 2020
Páginas: 167 - 178

Resumen

Abstract

In this paper, a simulation and an experimental analysis of upsetting a cold ring placed between two rigid plates were conducted. When designing a new process, it is preferable to carry out the simulation studies using FEM, which allow for the prediction of the course and proper selection of process conditions. Due to the complexity of phenomena that occur during plastic formation, it is essential to have a good description of contact phenomena and properties of material in the plastic state. The computer simulation was performed for a specific material – a thick plate of hot-rolled carbon steel with fixed initial dimensions of rings and different values of the coefficient of friction.

Palabras clave

  • upsetting
  • friction
  • FEM simulation
Acceso abierto

The conditions for thermographic testing of thermal power engineering installations

Publicado en línea: 29 May 2020
Páginas: 179 - 192

Resumen

Abstract

Thermographic cameras are becoming increasingly popular in all kinds of diagnostic testing aiming to assess the technical state of thermal power engineering machinery, equipment and installations. The cameras provide thermograms that enable identification of various irregularities, including thermal bridges. However, it can be observed that their accuracy and reliability depend substantially on the conditions in which tests are carried out. Industrial thermographic testing, especially in thermal power engineering, is one of the most difficult procedures. Apart from the advantages of this particular technique, this paper presents an analysis of the effect of the conditions in which tests are performed on the obtained results. Attention is drawn to parameters characterizing the environment and the tested element surface, such as emissivity, reflected temperature, distance between the camera and the object, air temperature, etc. The sources of errors in the testing and in the interpretation of thermograms are indicated. Methods are also presented that enable elimination of irregularities, which improves the accuracy of the final results.

Palabras clave

  • engineering installations
  • thermographic testing
  • thermogram
  • emissivity
  • reflected temperature
Acceso abierto

CFD simulations of hydrofoils for tidal turbines

Publicado en línea: 29 May 2020
Páginas: 193 - 199

Resumen

Abstract

Tidal energy might be extracted in a very similar way as the wind one by using turbines. However, due to environmental conditions, unsteady nature of tidal currents and wave activity, tidal turbines have to fulfill very demanding requirements. Such turbines might be structurally similar to wind turbines, but due to a different medium, the key issue is extracting tidal energy in the most effective way. This paper presents a way in which CFD tools may be used for selecting hydrofoil for tidal turbines.

Palabras clave

  • CFD
  • tidal turbine
20 Artículos
Acceso abierto

Modern green technologies and solutions in landscape architecture

Publicado en línea: 29 May 2020
Páginas: 5 - 13

Resumen

Abstract

The paper presents modern technological solutions used in landscape architecture, with special emphasis on their occurrence in the areas of historical greenery. Dynamic introduction of new tools allows us to take special care of valuable areas, stressing their importance and at the same time granting them new functions. The latter part discusses a specific example of this type of solutions from the area of Katowice. These are modern developments that make the historic pattern of industrial city more legible.

Palabras clave

  • modern technologies
  • landscape architecture
  • Katowice
Acceso abierto

Contemporary art in the historic landscape

Publicado en línea: 29 May 2020
Páginas: 15 - 22

Resumen

Abstract

The paper discusses the subject of the introduction of modern forms into spaces of a historical character, mainly into historical gardens. Its aim is to present the general tendencies, causes and scope of the introduction of modern art into these types of interiors, the problem of their interference with historical tissue, its scope and goal, along with an outline of general guidelines for these types of projects.

Palabras clave

  • historical gardens
  • art
  • contemporary art
  • monument preservation
  • exhibition design
Acceso abierto

Contemporary spatial composition of historic architectural-garden systems and urban parks in the area of warsaw escarpment in the district mokotów in warsaw

Publicado en línea: 29 May 2020
Páginas: 23 - 34

Resumen

Abstract

The article presents the contemporary spatial transformations of valuable architectural-garden systems and urban parks shaped in the area of Warsaw Escarpment in the district Mokotów in Warsaw: residential complex Królikarnia and Park Arkadia, residential complex Mokotów and Dreszer Park. Contemporary spatial composition of the complexes refers to carefully composed landscape of original projects, which emphasized the most valuable characteristics of the place, but also indicate many spatial transformations of study areas as well as the areas located in the immediate vicinity. These transformations are both positive and negative. Among the positive changes it is necessary to mention contemporary attempts of shaping and use of public spaces in parks and complexes, together with the processes of revalorization of different elements.

Palabras clave

  • composition
  • urban park
  • public space
  • Warsaw Escarpment
Acceso abierto

Contemporary development concepts for the escarp of the pomeranian dukes’ castle in szczecin

Publicado en línea: 29 May 2020
Páginas: 35 - 44

Resumen

Abstract

The Pomeranian Dukes’ Castle in Szczecin forms one of the most characteristic elements of Szczecin’s cityscape. That is why it is extremely important to expose its values properly, to stress the solid of the castle in the city panorama, according to its historical condition. Modern concepts for development of the northern castle escarp do not always meet the above expectations, both when it comes to composition and the very geotechnical safety of the escarp. The contemporary concepts for the development of northern escarp of the Castle Hill in Szczecin were presented in the paper, on the background of the complex historic, compositional and also technical conditions.

Palabras clave

  • revalorization of historic gardens
  • castle gardens
  • Pomeranian Dukes’ Castle in Szczecin
Acceso abierto

Shaping of the living environment of the elderly and its relations with the surrounding areas upon the example of copenhagen

Publicado en línea: 29 May 2020
Páginas: 45 - 56

Resumen

Abstract

This paper demonstrates the possibilities of shaping of the living environment of the elderly in connection with the existing urban tissue according to the principle of inclusion in the space used together with the younger generation.The subject matter of the analysis are selected examples of Danish architectural and urban projects implemented in Copenhagen over the last decade. Denmark is one of the leading European countries in terms of its policy towards seniors and shaping of the living environment of elderly people.

Palabras clave

  • architecture
  • urban design
  • living environment of the elderly
Acceso abierto

On the creation of a social conceptual design of a public park – notes on a design employing the workshop method based on the case of reduta park in krakow

Publicado en línea: 29 May 2020
Páginas: 57 - 68

Resumen

Abstract

The paper, in the form of a descriptive analysis, presents the method of designing a public park through the use of workshops. The structure of the entirety of the design, as well as important elements that a tutor – a specialist responsible for the animation of a group of members of the local community – should focus on, are presented in the work.

Palabras clave

  • city park
  • participation
  • a social conceptual design of a park
  • tutor
  • workshops
Acceso abierto

Investigation of temperature distribution in the ground induced by heat source and under natural conditions

Publicado en línea: 29 May 2020
Páginas: 69 - 77

Resumen

Abstract

This paper deals with theoretical and experimental analysis of heat transfer in the ground. Calculation results of heat transfer under natural conditions were presented. Temperature profiles in the ground were determined for cyclic steady state. Results of experimental studies conducted in laboratory setup were shown. Experimental studies were related to determination of temperature of the heated granular bed. The calculation and measurement results presented were used to determine a mathematical model of the ground heat exchanger.

Palabras clave

  • process modelling
  • transient heat conduction
  • renewable energy sources
Acceso abierto

Production engineering tools for civil engineering practice – the case of QFD

Publicado en línea: 29 May 2020
Páginas: 79 - 84

Resumen

Abstract

This article is a part of a series of papers which discuss the usefulness of production engineering tools for general civil engineering. Applications of selected production engineering tools in civil engineering are presented in these papers. The diverse nature of the tools is considered while outlining detailed areas of their application in civil engineering. The features of the tools make them representative of production engineering methodology. Thus, information about the civil engineering applications of the tools also makes it possible to draw practical conclusions about the general usefulness of production engineering methodology in civil engineering. The applications of quality function deployment (QFD) are utilised in this regard in the article.

Palabras clave

  • civil engineering
  • construction
  • decision
  • support
  • production engineering
  • tool
  • application
  • QFD
Acceso abierto

Production engineering tools for civil engineering practice – the case of FMEA

Publicado en línea: 29 May 2020
Páginas: 85 - 92

Resumen

Abstract

This article is the first of a series of papers which discuss the usefulness of production engineering tools for general civil engineering. Applications of selected production engineering tools in civil engineering are presented in these papers. The diverse nature of the tools is considered while outlining detailed areas of their application in civil engineering. The features of the tools make them representative of production engineering methodology. Thus, information about the civil engineering applications of the tools also makes it possible to draw practical conclusions about the general usefulness of production engineering methodology in civil engineering. The applications of failure mode and effect analysis (FMEA) are utilised in this regard in the article.

Palabras clave

  • civil engineering
  • construction
  • decision
  • support
  • production engineering
  • tool
  • application
  • FMEA
Acceso abierto

The concept of the composition of self-compacting concrete with low hardening heat

Publicado en línea: 29 May 2020
Páginas: 93 - 101

Resumen

Abstract

This paper presents a proposal for shaping the properties of green self-compacting concrete, mostly focussing on minimising the amount of clinker in concrete and obtaining lower hardening temperatures. The main application of this SCC would be in constructions build during summer, as well as in massive and semi-massive structures. In these kinds of constructions, thermal effects connected with cement hydration are of particular importance. The difference in temperature between the interior and the relatively fast cooling exterior of the concrete element leads to thermal stress. In extreme conditions, this can cause cracking within the entire bulk of concrete element, leading to a lowering of its durability and longevity.

Palabras clave

  • self-compacting concrete
  • heat of hydration
  • massive structures
Acceso abierto

An overview of selected methods for the identification and qualitative assessment of risk factors

Publicado en línea: 29 May 2020
Páginas: 103 - 111

Resumen

Abstract

The problematic nature of the identification and assessment of the risk factors is a familiar subject area. As a result of this, many scientists are continually attempting to modify existing methods and develop new approaches to achieve this objective. Therefore, it is recommended to periodically review the methods used – this reveals areas of knowledge in this area which remain undeveloped and also determines which methods can complement or verify each other. In this article, current methods for the identification and qualitative assessment of risk factors are described and compared in a tabular manner; the author also proposes potential approaches for the modification and improvement of these methods.

Palabras clave

  • risk management
  • qualitative analysis
Acceso abierto

The influence of foundation for the initiation and growth of the landslidein the carpathian flysch

Publicado en línea: 29 May 2020
Páginas: 113 - 121

Resumen

Abstract

The southern part of Poland is mostly covered by Carpathian mountains. Carpathian Flysch is especially predisposed for the landslides type of the subsoil. Around 98% of all occurring in the country landslides are located in Carpathians. Many of them became active in May 2010, when periodically dormant landslides and new landslide were activated after intensive rainfall. In addition to the main causes of landslides such as rainwater and its infiltration into the ground layers also the Carpathian Flysch tectonic construction (rock layers collapsing in one direction, with numerous jumps and discontinuity) and some anthropogenic influences (loading, slopes undercutting, improper dehydration, etc.) are typical triggering factors. Landslide activity contributes not only to a significant progress of the relief to which occur, but it also carries devastating consequences for the population living nearby. Landslides are a natural threat for economic activities and people’s lives. They are the cause of the damage not only residential buildings but also road and railways and other infrastructure. The landslide analysed here is located in Tymbark, Limanowa district. This article discusses the influence of the building foundation for initiation and growth of the landslide zone in the Carpathian Flysch. Two types of foundations are analysed – base plate foundation and a continuous footing. In both cases, there is a high risk to occur slip zones (FoS < 1.5). Base plate turns out to be more favorable foundation in this subgrade conditions. Although the displacements are relatively larger than in the other case, slip zone is located quite shallow. In the case of the continuous footing, landslide may form deeper reaching the bedrock.

Palabras clave

  • landslides
  • Carpathian flysh
  • numerical model
  • stability analysis
  • MIDAS
Acceso abierto

An environmental life-cycle assessment of selected concrete recycling processes

Publicado en línea: 29 May 2020
Páginas: 123 - 130

Resumen

Abstract

Social and economic development trends require that the economy be based on sustainable consumption and sustainable production patterns by means of implementing an effective recirculation policy – this is also important from an environmental perspective. Consequently, the design of economic processes becomes increasingly complex. This paper presents method and results of environmental life-cycle assessment of selected stages of the concrete recycling process. The results will be used in a further, holistic assessment of managing the concrete waste on the construction site.

Palabras clave

  • LCA
  • RCA
  • sustainable construction
Acceso abierto

Empirical research of human-weapon system

Publicado en línea: 29 May 2020
Páginas: 131 - 139

Resumen

Abstract

Rapid firing of the Skorpion vz.61 machine gun was registered at a police shooting range. The shooting was executed by a policeman from the secret service. The registration was done with the use of a fast digital camera Phantom v9.1 together with the necessary equipment. With the use of the specialised TEMA software, which serves to analyse the recorded image, the courses of the variation of kinematic quantities characterizing the weapon movement were obtained. On the basis of the courses of the variation of the displacement, velocity and acceleration over time, the behaviour of the machine gun in thirteen characteristic points of its operation was specified.

Palabras clave

  • weapon
  • human
  • registration of firing
  • kinematics of movement
Acceso abierto

Matrix FMEA analysis with cause-effect diagram for selected fluid power component

Publicado en línea: 29 May 2020
Páginas: 141 - 146

Resumen

Abstract

This paper presents an application of matrix FMEA analysis and cause-effect diagram for a double acting hydraulic cylinder. A decomposition of the investigated cylinder has been made and main functions and potential failures for the pair-function relation have been identified. Elements with the greatest probability of failure and cause-effect relationship have been determined.

Palabras clave

  • FMEA
  • cause and effect diagram
Acceso abierto

Modelling of a pneumatic cushion in matlab-simulink system

Publicado en línea: 29 May 2020
Páginas: 147 - 154

Resumen

Abstract

The paper addresses modelling, simulation and experimental research of a pneumatic cushion. The scope of work included formulating a mathematical model based on air flow equations, building simulation model, carrying out simulations and comparing simulation results with experiments. The simulations were performed in Matlab-Simulink system, while experiments were carried out on a test bench, by means of a real industrial pneumatic cushion. The comparison of the results indicates that the created simulation model is accurate and flexible, and thus can be used in further research which concerns e.g. geometrical modifications or optimization of air consumption.

Palabras clave

  • pneumatic cushion
  • modelling
  • simulation
  • Matlab-Simulink
Acceso abierto

The effect of selected natural fillers on the mechanical properties of low-density polyethylene

Publicado en línea: 29 May 2020
Páginas: 155 - 166

Resumen

Abstract

The popularity of using natural waste products in different branches of industry, including polymer processing, results from the emphasis of international nature conservation organizations on ecological and environmental problems, such as recycling, storage and the disposal of waste products. This paper investigates the effect of two natural fillers: wheat bran and pumpkin seeds obtained from food industry waste products, on selected mechanical properties of LDPE molded pieces. The polymer blends are examined with respect to their basic mechanical properties and microstructure.

Palabras clave

  • natural waste material
  • mechanical properties
  • wheat bran
  • pumpkin seeds
Acceso abierto

Simulation studies on ring upsetting using the ABAQUS software

Publicado en línea: 29 May 2020
Páginas: 167 - 178

Resumen

Abstract

In this paper, a simulation and an experimental analysis of upsetting a cold ring placed between two rigid plates were conducted. When designing a new process, it is preferable to carry out the simulation studies using FEM, which allow for the prediction of the course and proper selection of process conditions. Due to the complexity of phenomena that occur during plastic formation, it is essential to have a good description of contact phenomena and properties of material in the plastic state. The computer simulation was performed for a specific material – a thick plate of hot-rolled carbon steel with fixed initial dimensions of rings and different values of the coefficient of friction.

Palabras clave

  • upsetting
  • friction
  • FEM simulation
Acceso abierto

The conditions for thermographic testing of thermal power engineering installations

Publicado en línea: 29 May 2020
Páginas: 179 - 192

Resumen

Abstract

Thermographic cameras are becoming increasingly popular in all kinds of diagnostic testing aiming to assess the technical state of thermal power engineering machinery, equipment and installations. The cameras provide thermograms that enable identification of various irregularities, including thermal bridges. However, it can be observed that their accuracy and reliability depend substantially on the conditions in which tests are carried out. Industrial thermographic testing, especially in thermal power engineering, is one of the most difficult procedures. Apart from the advantages of this particular technique, this paper presents an analysis of the effect of the conditions in which tests are performed on the obtained results. Attention is drawn to parameters characterizing the environment and the tested element surface, such as emissivity, reflected temperature, distance between the camera and the object, air temperature, etc. The sources of errors in the testing and in the interpretation of thermograms are indicated. Methods are also presented that enable elimination of irregularities, which improves the accuracy of the final results.

Palabras clave

  • engineering installations
  • thermographic testing
  • thermogram
  • emissivity
  • reflected temperature
Acceso abierto

CFD simulations of hydrofoils for tidal turbines

Publicado en línea: 29 May 2020
Páginas: 193 - 199

Resumen

Abstract

Tidal energy might be extracted in a very similar way as the wind one by using turbines. However, due to environmental conditions, unsteady nature of tidal currents and wave activity, tidal turbines have to fulfill very demanding requirements. Such turbines might be structurally similar to wind turbines, but due to a different medium, the key issue is extracting tidal energy in the most effective way. This paper presents a way in which CFD tools may be used for selecting hydrofoil for tidal turbines.

Palabras clave

  • CFD
  • tidal turbine

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