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Détails du magazine
Format
Magazine
eISSN
2353-7779
Première publication
30 Mar 2018
Période de publication
4 fois par an
Langues
Anglais

Chercher

Volume 19 (2018): Edition 19 (June 2018)

Détails du magazine
Format
Magazine
eISSN
2353-7779
Première publication
30 Mar 2018
Période de publication
4 fois par an
Langues
Anglais

Chercher

10 Articles
Accès libre

Fatigue lifetime of 20MnV6 steel with holes manufactured by various methods

Publié en ligne: 14 Nov 2018
Pages: 3 - 5

Résumé

Abstract

In this paper, the authors publish their own experimental results of the examination of the different holes (milled, drilled and drilled + shot peened) on the fatigue lifetime of 20MnV6 steel. The experiments were carried out at low-frequency loading (f = 10 Hz, pulsating tension loading) in the region from N = 2×105 up to N = 2×106 cycles. The best fatigue properties were obtained in the parts with drilled + shot peened holes.

Mots clés

  • Steel 20MnV6
  • Fatigue lifetime
  • High-cycle fatigue

JEL Classification

  • L69
  • M11
Accès libre

The evaluation of wear of tungsten carbide dental bur

Publié en ligne: 14 Nov 2018
Pages: 6 - 9

Résumé

Abstract

Due to its durability, tungsten carbide has long been used as a material to produce dental burs. WC– Co burs are designed for smooth, efficient cutting and extended life. Dental burs are available in different sizes and shapes, for example round burs, pear and cylinder-shaped, egg-shaped, as well as there are various tapered ones, which enable an individual selection of the drill for the right treatment. Carbides can be used for standard crowns and bridges, for extensive surgical procedures and they should minimize damage to the existing teeth. The design of WC–Co dental bur reduces a patient’s discomfort because of the operating time and the fact that its liquidity is preserved. The head of the bur (the cutting edge) delivers optimum concentricity and strength. The shank is made from stainless steel allowing a bur to be autoclaved multiple times without the risk of corrosion. The main purpose of this study was to evaluate the wear of a tungsten carbide dental bur. The results of stereoscopy microscope and SEM/EDS analysis are presented.

Mots clés

  • Tungsten carbide burs
  • WC–Co
  • Dental burs

JEL Classification

  • L69
  • M11
Accès libre

Six Sigma as a method of improving the quality of service process

Publié en ligne: 14 Nov 2018
Pages: 10 - 15

Résumé

Abstract

The objective of the analysis conducted and described in this paper has been to present the practical application of the Six Sigma method based on the DMAIC cycle in improving the quality of the service process. The first part of the article contains the theoretical framework of six sigma and the issue of using its tools in the aspect of services. Afterwards, there has been calculated the initial sigma value which indicated the need for improvement. Measurement phase has been developed by the value stream mapping, process FMEA and customer survey which results have been analyzed in Pareto chart and fishbone diagram. Improve phase includes the Impact&Effort Matrix and target sigma level that can be achieved as a result of failures reducing and service quality improvement.

Mots clés

  • DMAIC cycle
  • improvement
  • quality
  • service process
  • Six Sigma

JEL Classification

  • L23
  • M11
Accès libre

Social engineering of human resources and provision of medical services on leadership styles in hospitals

Publié en ligne: 14 Nov 2018
Pages: 16 - 21

Résumé

Abstract

Paper present impact of human resources issues as well as issues related to provision of medical services on leadership styles in hospitals in Poland. In this study a descriptive research design was used and a quantitative research was conducted, which was based on the so-called BOST methodology. Surveys were conducted among department heads of 10 public hospitals of various referral systems from the Upper-Silesian Agglomeration providing various types of medical services (which shows a large variety of research sample) operating in Poland. The research showed that both improtance of service provision as well as human resources were not as important as they should be.

Mots clés

  • hospital
  • features
  • leadership
  • BOST methodology

JEL Classification

  • L23
  • M11
Accès libre

Obtaining of biomorphic composites based on carbon materials

Publié en ligne: 14 Nov 2018
Pages: 22 - 25

Résumé

Abstract

Aim of this paper is to present the properties of carbon preforms for the production of biomorphic composites. Carbon samples were obtained through pyrolysis of paulownia wood, replicating the microstructure of the cellulosic precursor. Many characterization methods such as Raman Spectroscopy, light microscopy, hardness tests and pore size analyzer detection were used to investigate the microstructure of the product as well as the pore size of carbon samples. Obtained results showed that the parts of early or late wood template play an important role in the pore size, specific surface area and pore volume of the product. This review aims to be a comprehensive description of the development of carbon chars: from wood templates and their microstructure to potential applications of biomorphic materials.

Mots clés

  • carbon material
  • biomorphic composite
  • wood precursors
  • natural material
  • pyrolysis

JEL Classification

  • L69
  • M11
Accès libre

Quality control of a metallic dental bur with a diamond coating

Publié en ligne: 14 Nov 2018
Pages: 26 - 29

Résumé

Abstract

During operation, sterilization and disinfection, the surface working part of dental burs deteriorates. In this study a commercial metallic dental bur with extra coarse gradation (177-250 μ of ceramic embankment), made of a stainless steel were covered with a nickel-diamond composite was examined. The working part of the tool is round-end taper shaped and is intended for crown and bridge preparation. Analysis of microstructure was carried out using Jeol JSM-6610 LV scanning electron microscope with EDX analyzer. After 3 months of operation, the bur can be used for further work in the dental surgery.

Mots clés

  • dental bur
  • diamond coating
  • dental tools
  • quality control

JEL Classification

  • L69
  • M11
Accès libre

Influence of modifcation on the refinement of primary silicon crystals in hypereutectic silumin AlSi21CuNi

Publié en ligne: 14 Nov 2018
Pages: 30 - 36

Résumé

Abstract

On the paper the influence of modifying micro additives on the refinement of primary silicon crystals in the hypereutectic AlSi21CuNi piston silumin have been examined. As the modifiers there were used micro additives of Phosphorus in the form of AlCu19P1.4 and CuP12 pre-alloys, sulfur in the form of CuS and iron in the powdered form. The modifying micro additives were used separately and together. Micro additions of iron were used together with phosphorus. Sulfur micro addition provided the fragmentation of the primary silicon crystals, but not as effective as the phosphorus micro additive. The best effect of fragmentation of the primary silicon crystals was ensured by the combined addition of phosphorus in the form of AlCu19P1,4 pre alloy with a micro additive of powdered iron which reduced the average size of the primary silicon crystals from 114 μm to 20 μm.

Mots clés

  • silumin
  • microstructure
  • micro additive
  • modification

JEL Classification

  • L69
  • M11
Accès libre

An offline path planning method for autonomous vehicles

Publié en ligne: 14 Nov 2018
Pages: 37 - 42

Résumé

Abstract

Driving a road vehicle is a very complex task in terms of controlling it, substituting a human driver with a computer is a real challenge also from the technical side. An important step in vehicle controlling is when the vehicle plans its own trajectory. The input of the trajectory planning are the purpose of the passengers and the environment of the vehicle. The trajectory planning process has several parts, for instance, the geometry of the path-curve or the speed during the way. Furthermore, a traffic situation can also determine many other parameters in the planning process.

This paper presents a basic approach for trajectory design. To reach the aim a map will be given as a binary 2204 x 1294 size matrix where the roads will be defined by ones, the obstacles will be defined by zeros. The aim is to make an algorithm which can find the shortest and a suitable way for vehicles between the start and the target point. The vehicle speed will be slow enough to ignore the dynamical properties of the vehicle. The research is one of the first steps to realize automated parking features in a self-drive car.

Mots clés

  • Connected and automated
  • vehicles
  • Autonomous driving
  • Self-driving vehicles
  • Trajectory planning
  • Path planning

JEL Classification

  • L91
  • M11
Accès libre

Classification of traffic signal system anomalies for environment tests of autonomous vehicles

Publié en ligne: 14 Nov 2018
Pages: 43 - 47

Résumé

Abstract

In the future there will be a lot of changes and development concerning autonomous transport that will affect all participants of transport. There are still difficulties in organizing transport, but with the introduction of autonomous vehicles more challenges can be expected. Recognizing and tracking horizontal and vertical signs can cause a difficulties for drivers and, later, for autonomous systems. Environmental conditions, deformity and quality affect the perception of signals. The correct recognition results in safe travelling for everyone on the roads. Traffic signs are designed for people that is why the recognition process is harder for the machines. However, nowadays some developers try to create a traffic sign that autonomous vehicles can use. Computer identification needs further development, as it is necessary to consider cases where traffic signs are deformed or not properly placed. In the following investigation, the advantages and disadvantages of the different perception methods and their possibilities were gathered. A methodology for the classification of horizontal and vertical traffic signs anomalies that may help in designing better testing and validation environments for traffic sign recognition systems in the future was also proposed.

Mots clés

  • classification
  • traffic signal system
  • anomalies
  • autonomous vehicles
  • test environment

JEL Classification

  • L91
  • M11
Accès libre

Barriers and opportunities in implementation of Lean Manufacturing tools in the ceramic industry

Publié en ligne: 14 Nov 2018
Pages: 48 - 52

Résumé

Abstract

The concept of lean management in an organization, improving products and processes using the Lean Manufacturing concept, is discussed in this paper. Striving for excellence is the key factor in maintaining competitiveness on the market. Only organizations able to adapt to changing environmental conditions faster than others achieve an advantage, and the management in line with the Lean Manufacturing philosophy is de facto change management. In this paper, important factors in the ceramic industry, which should be taken into account when implementing Lean Manufacturing are characterized. Important factors affecting the implementation of lean tools include, such as: the size of the enterprise, involvement of employees, knowledge about the Lean concept, technological factor, type and variety of the product line, as well as the specificity of the ceramic industry. The greatest opportunity associated with the implementation of Lean is to increase the competitiveness of the company obtained through: meeting the quality and economic expectations of customers. The greatest opportunity associated with implementation of the Lean is to increase competitiveness of the company obtained through: meeting the quality and economic expectations of their customers. Practice shows, however, that despite the simplicity of rules and tools, few organizations manage to achieve the level of excellence of the pioneer of this concept, the Japanese Toyota Corporation.

Mots clés

  • Lean manufacturing
  • Lean management
  • Ceramic industry
  • Barriers to implementation
  • Lean tools

JEL Classification

  • L23
  • M11
10 Articles
Accès libre

Fatigue lifetime of 20MnV6 steel with holes manufactured by various methods

Publié en ligne: 14 Nov 2018
Pages: 3 - 5

Résumé

Abstract

In this paper, the authors publish their own experimental results of the examination of the different holes (milled, drilled and drilled + shot peened) on the fatigue lifetime of 20MnV6 steel. The experiments were carried out at low-frequency loading (f = 10 Hz, pulsating tension loading) in the region from N = 2×105 up to N = 2×106 cycles. The best fatigue properties were obtained in the parts with drilled + shot peened holes.

Mots clés

  • Steel 20MnV6
  • Fatigue lifetime
  • High-cycle fatigue

JEL Classification

  • L69
  • M11
Accès libre

The evaluation of wear of tungsten carbide dental bur

Publié en ligne: 14 Nov 2018
Pages: 6 - 9

Résumé

Abstract

Due to its durability, tungsten carbide has long been used as a material to produce dental burs. WC– Co burs are designed for smooth, efficient cutting and extended life. Dental burs are available in different sizes and shapes, for example round burs, pear and cylinder-shaped, egg-shaped, as well as there are various tapered ones, which enable an individual selection of the drill for the right treatment. Carbides can be used for standard crowns and bridges, for extensive surgical procedures and they should minimize damage to the existing teeth. The design of WC–Co dental bur reduces a patient’s discomfort because of the operating time and the fact that its liquidity is preserved. The head of the bur (the cutting edge) delivers optimum concentricity and strength. The shank is made from stainless steel allowing a bur to be autoclaved multiple times without the risk of corrosion. The main purpose of this study was to evaluate the wear of a tungsten carbide dental bur. The results of stereoscopy microscope and SEM/EDS analysis are presented.

Mots clés

  • Tungsten carbide burs
  • WC–Co
  • Dental burs

JEL Classification

  • L69
  • M11
Accès libre

Six Sigma as a method of improving the quality of service process

Publié en ligne: 14 Nov 2018
Pages: 10 - 15

Résumé

Abstract

The objective of the analysis conducted and described in this paper has been to present the practical application of the Six Sigma method based on the DMAIC cycle in improving the quality of the service process. The first part of the article contains the theoretical framework of six sigma and the issue of using its tools in the aspect of services. Afterwards, there has been calculated the initial sigma value which indicated the need for improvement. Measurement phase has been developed by the value stream mapping, process FMEA and customer survey which results have been analyzed in Pareto chart and fishbone diagram. Improve phase includes the Impact&Effort Matrix and target sigma level that can be achieved as a result of failures reducing and service quality improvement.

Mots clés

  • DMAIC cycle
  • improvement
  • quality
  • service process
  • Six Sigma

JEL Classification

  • L23
  • M11
Accès libre

Social engineering of human resources and provision of medical services on leadership styles in hospitals

Publié en ligne: 14 Nov 2018
Pages: 16 - 21

Résumé

Abstract

Paper present impact of human resources issues as well as issues related to provision of medical services on leadership styles in hospitals in Poland. In this study a descriptive research design was used and a quantitative research was conducted, which was based on the so-called BOST methodology. Surveys were conducted among department heads of 10 public hospitals of various referral systems from the Upper-Silesian Agglomeration providing various types of medical services (which shows a large variety of research sample) operating in Poland. The research showed that both improtance of service provision as well as human resources were not as important as they should be.

Mots clés

  • hospital
  • features
  • leadership
  • BOST methodology

JEL Classification

  • L23
  • M11
Accès libre

Obtaining of biomorphic composites based on carbon materials

Publié en ligne: 14 Nov 2018
Pages: 22 - 25

Résumé

Abstract

Aim of this paper is to present the properties of carbon preforms for the production of biomorphic composites. Carbon samples were obtained through pyrolysis of paulownia wood, replicating the microstructure of the cellulosic precursor. Many characterization methods such as Raman Spectroscopy, light microscopy, hardness tests and pore size analyzer detection were used to investigate the microstructure of the product as well as the pore size of carbon samples. Obtained results showed that the parts of early or late wood template play an important role in the pore size, specific surface area and pore volume of the product. This review aims to be a comprehensive description of the development of carbon chars: from wood templates and their microstructure to potential applications of biomorphic materials.

Mots clés

  • carbon material
  • biomorphic composite
  • wood precursors
  • natural material
  • pyrolysis

JEL Classification

  • L69
  • M11
Accès libre

Quality control of a metallic dental bur with a diamond coating

Publié en ligne: 14 Nov 2018
Pages: 26 - 29

Résumé

Abstract

During operation, sterilization and disinfection, the surface working part of dental burs deteriorates. In this study a commercial metallic dental bur with extra coarse gradation (177-250 μ of ceramic embankment), made of a stainless steel were covered with a nickel-diamond composite was examined. The working part of the tool is round-end taper shaped and is intended for crown and bridge preparation. Analysis of microstructure was carried out using Jeol JSM-6610 LV scanning electron microscope with EDX analyzer. After 3 months of operation, the bur can be used for further work in the dental surgery.

Mots clés

  • dental bur
  • diamond coating
  • dental tools
  • quality control

JEL Classification

  • L69
  • M11
Accès libre

Influence of modifcation on the refinement of primary silicon crystals in hypereutectic silumin AlSi21CuNi

Publié en ligne: 14 Nov 2018
Pages: 30 - 36

Résumé

Abstract

On the paper the influence of modifying micro additives on the refinement of primary silicon crystals in the hypereutectic AlSi21CuNi piston silumin have been examined. As the modifiers there were used micro additives of Phosphorus in the form of AlCu19P1.4 and CuP12 pre-alloys, sulfur in the form of CuS and iron in the powdered form. The modifying micro additives were used separately and together. Micro additions of iron were used together with phosphorus. Sulfur micro addition provided the fragmentation of the primary silicon crystals, but not as effective as the phosphorus micro additive. The best effect of fragmentation of the primary silicon crystals was ensured by the combined addition of phosphorus in the form of AlCu19P1,4 pre alloy with a micro additive of powdered iron which reduced the average size of the primary silicon crystals from 114 μm to 20 μm.

Mots clés

  • silumin
  • microstructure
  • micro additive
  • modification

JEL Classification

  • L69
  • M11
Accès libre

An offline path planning method for autonomous vehicles

Publié en ligne: 14 Nov 2018
Pages: 37 - 42

Résumé

Abstract

Driving a road vehicle is a very complex task in terms of controlling it, substituting a human driver with a computer is a real challenge also from the technical side. An important step in vehicle controlling is when the vehicle plans its own trajectory. The input of the trajectory planning are the purpose of the passengers and the environment of the vehicle. The trajectory planning process has several parts, for instance, the geometry of the path-curve or the speed during the way. Furthermore, a traffic situation can also determine many other parameters in the planning process.

This paper presents a basic approach for trajectory design. To reach the aim a map will be given as a binary 2204 x 1294 size matrix where the roads will be defined by ones, the obstacles will be defined by zeros. The aim is to make an algorithm which can find the shortest and a suitable way for vehicles between the start and the target point. The vehicle speed will be slow enough to ignore the dynamical properties of the vehicle. The research is one of the first steps to realize automated parking features in a self-drive car.

Mots clés

  • Connected and automated
  • vehicles
  • Autonomous driving
  • Self-driving vehicles
  • Trajectory planning
  • Path planning

JEL Classification

  • L91
  • M11
Accès libre

Classification of traffic signal system anomalies for environment tests of autonomous vehicles

Publié en ligne: 14 Nov 2018
Pages: 43 - 47

Résumé

Abstract

In the future there will be a lot of changes and development concerning autonomous transport that will affect all participants of transport. There are still difficulties in organizing transport, but with the introduction of autonomous vehicles more challenges can be expected. Recognizing and tracking horizontal and vertical signs can cause a difficulties for drivers and, later, for autonomous systems. Environmental conditions, deformity and quality affect the perception of signals. The correct recognition results in safe travelling for everyone on the roads. Traffic signs are designed for people that is why the recognition process is harder for the machines. However, nowadays some developers try to create a traffic sign that autonomous vehicles can use. Computer identification needs further development, as it is necessary to consider cases where traffic signs are deformed or not properly placed. In the following investigation, the advantages and disadvantages of the different perception methods and their possibilities were gathered. A methodology for the classification of horizontal and vertical traffic signs anomalies that may help in designing better testing and validation environments for traffic sign recognition systems in the future was also proposed.

Mots clés

  • classification
  • traffic signal system
  • anomalies
  • autonomous vehicles
  • test environment

JEL Classification

  • L91
  • M11
Accès libre

Barriers and opportunities in implementation of Lean Manufacturing tools in the ceramic industry

Publié en ligne: 14 Nov 2018
Pages: 48 - 52

Résumé

Abstract

The concept of lean management in an organization, improving products and processes using the Lean Manufacturing concept, is discussed in this paper. Striving for excellence is the key factor in maintaining competitiveness on the market. Only organizations able to adapt to changing environmental conditions faster than others achieve an advantage, and the management in line with the Lean Manufacturing philosophy is de facto change management. In this paper, important factors in the ceramic industry, which should be taken into account when implementing Lean Manufacturing are characterized. Important factors affecting the implementation of lean tools include, such as: the size of the enterprise, involvement of employees, knowledge about the Lean concept, technological factor, type and variety of the product line, as well as the specificity of the ceramic industry. The greatest opportunity associated with the implementation of Lean is to increase the competitiveness of the company obtained through: meeting the quality and economic expectations of customers. The greatest opportunity associated with implementation of the Lean is to increase competitiveness of the company obtained through: meeting the quality and economic expectations of their customers. Practice shows, however, that despite the simplicity of rules and tools, few organizations manage to achieve the level of excellence of the pioneer of this concept, the Japanese Toyota Corporation.

Mots clés

  • Lean manufacturing
  • Lean management
  • Ceramic industry
  • Barriers to implementation
  • Lean tools

JEL Classification

  • L23
  • M11

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