Zeszyty czasopisma

Tom 28 (2022): Zeszyt 3 (September 2022)

Tom 28 (2022): Zeszyt 2 (June 2022)

Tom 28 (2022): Zeszyt 1 (March 2022)

Tom 27 (2021): Zeszyt 4 (December 2021)

Tom 27 (2021): Zeszyt 3 (September 2021)

Tom 27 (2021): Zeszyt 2 (June 2021)

Tom 27 (2021): Zeszyt 1 (March 2021)

Tom 26 (2020): Zeszyt 4 (December 2020)

Tom 26 (2020): Zeszyt 3 (September 2020)

Tom 26 (2020): Zeszyt 2 (June 2020)

Tom 26 (2020): Zeszyt 1 (March 2020)

Tom 25 (2019): Zeszyt 25 (December 2019)

Tom 24 (2019): Zeszyt 24 (September 2019)

Tom 23 (2019): Zeszyt 23 (June 2019)

Tom 22 (2019): Zeszyt 22 (March 2019)

Tom 21 (2018): Zeszyt 21 (December 2018)

Tom 20 (2018): Zeszyt 20 (September 2018)

Tom 19 (2018): Zeszyt 19 (June 2018)

Tom 18 (2018): Zeszyt 18 (March 2018)

Tom 17 (2017): Zeszyt 17 (December 2017)

Tom 16 (2017): Zeszyt 16 (September 2017)

Tom 15 (2017): Zeszyt 15 (June 2017)

Tom 14 (2017): Zeszyt 14 (March 2017)

Informacje o czasopiśmie
Format
Czasopismo
eISSN
2353-7779
Pierwsze wydanie
30 Mar 2018
Częstotliwość wydawania
4 razy w roku
Języki
Angielski

Wyszukiwanie

Tom 26 (2020): Zeszyt 2 (June 2020)

Informacje o czasopiśmie
Format
Czasopismo
eISSN
2353-7779
Pierwsze wydanie
30 Mar 2018
Częstotliwość wydawania
4 razy w roku
Języki
Angielski

Wyszukiwanie

8 Artykułów
access type Otwarty dostęp

Building decision trees based on production knowledge as support in decision-making process

Data publikacji: 25 Jun 2020
Zakres stron: 36 - 40

Abstrakt

Abstract

The article presents sources of production knowledge and thoroughly describes its identification which on the construction of decision trees, and on the construction of knowledge bases for production processes. The problems that arise during the technical preparation of production are briefly characterized and the advanced algorithm with which decision trees can be built is described in detail. A decision tree was built based on real data from the manufacturing company. Decision trees are presented as a method of knowledge representation.

Słowa kluczowe

  • decision trees
  • knowledge identification
  • production engineering
  • production knowledge
  • production processes
access type Otwarty dostęp

Microstructure and residual stress analysis of Strenx 700 MC welded joint

Data publikacji: 25 Jun 2020
Zakres stron: 41 - 44

Abstrakt

Abstract

High strength low alloy (HSLA) steels are a new generation of plain carbon steels with significantly improved mechanical properties while maintaining good weldability with common commercial techniques. Residual stress and microstructural analysis of welded HSLA Strenx 700 MC was carried out in this research. Results have shown that the welding process causes significant grain coarsening in the heat affected zone. The microstructural changes are also accompanied with creation of tensile residual stress field in the weld metal and heat affected zone, reaching up-to depth of 4 mm. Tensile residual stresses are well known for acceleration of fatigue crack initiation and together with coarse grains can lead to significant decrease of the fatigue properties of the welded structure.

Słowa kluczowe

  • Residual stress
  • High strength steel
  • Welding
  • Microstructure
  • Grain coarsening
access type Otwarty dostęp

Identification of health risks from harmful chemical agents – review concerning bisphenol A in workplace

Data publikacji: 25 Jun 2020
Zakres stron: 45 - 49

Abstrakt

Abstract

Bisphenol A (BPA) is an industrial chemical used as an additive in conventional point-of-sale thermal paper receipts, in the production of many polycarbonate plastics, and epoxy resins lignin for food. BPA is xenoestrogen, a foreign compound that is not naturally produced in living organisms, but which acts similarly to natural 17-ß estradiol (natural estrogen). Due to its weak estrogenic activities, BPA exposure may influence multiple endocrine-related pathway, and is associated with prostate and breast cancer, neurobehavioral deficits, heart disease, and obesity. Furthermore, BPA may act as a DNA methylation agent and cause altered gene expression in the brain. Human exposure to bisphenol A is a matter of controversy. This review shows a potential risks in workplace resulting from contact with bisphenol A. The work presents the contribution of BPA exposure levels via dermal contact and the relationship between BPA exposure level and oxidative DNA damage.

Słowa kluczowe

  • bisphenol A
  • health risk
  • harmful chemical agents
  • human exposure
  • DNA oxidative damage
access type Otwarty dostęp

Quality management and safety of food in HACCP system aspect

Data publikacji: 25 Jun 2020
Zakres stron: 50 - 53

Abstrakt

Abstract

The practical implementation of hazard analysis and critical control point (HACCP) and in particular the definition of the critical control points (CCPs) in the food industry is usually a complex structured task. This is particularly the case of food enterprise, where quality/safety manager ability, knowledge of the production processes and ‘‘sensitiveness’’ is usually the discriminate for the proper identification and prioritization of risks. The same applies for the definition of causes which may lead to food safety hazards. This paper addresses the issues of how quality/safety managers can objectively and automatically implement the HACCP principles of hazard analysis in the application of HACCP, which is the identification of risk priorities and of the related CCPs. The proposed methodology combines decision tree analysis approach for the analytical decomposition of the relevant steps in the manufacturing process of ice cream.

Słowa kluczowe

  • quality
  • HACCP system
  • safety of food
  • quality systems
  • competition
access type Otwarty dostęp

Thermal fracture characteristics of an interface crack subjected to temperature variations

Data publikacji: 25 Jun 2020
Zakres stron: 54 - 59

Abstrakt

Abstract

Thermal fracture characteristics – the thermal energy release rate and thermal stress intensity factor of a semi-infinite crack at an interface between the two elastic isotropic materials, subjected to the temperature variations, are considered in this paper. Those characteristics are determined based on application of the linear elastic fracture mechanics (LEFM) concept. Expressions for obtained theoretical solutions are compared to solutions from literature and they are found to be more concise. Influence of the materials change on these two thermal fracture properties were observed, as well as the influence of the thickness ratio of the two layers constituting the interface.

Słowa kluczowe

  • Interface crack
  • Two-layered sample
  • Temperature variation
  • Fracture properties
  • LEFM concept
access type Otwarty dostęp

Cost-quantitative analysis of non-compliance in the internal logistics process

Data publikacji: 25 Jun 2020
Zakres stron: 60 - 66

Abstrakt

Abstract

Internal logistics is a key element of a production process as it specifies product quality, timeliness and value of orders. The purpose of the research was to determine the amount of non-compliance in the selected production process caused by internal logistics operations. The analysis covers both the quantity and type of non-compliance as well as the cost of non-compliance. One of the basic quality management tools was used in the research - Parteo-Lorenz analysis. An attempt was made to identify potential causes of non-compliance. The significant impact of non-compliance arising in internal logistics operations in production costs was pointed out.

Słowa kluczowe

  • quality
  • cost
  • internal logistics process
  • Parteo-Lorenz analysis
access type Otwarty dostęp

Non-uniform corrosion of steel rebar and its influence on reinforced concrete elements` reliability

Data publikacji: 25 Jun 2020
Zakres stron: 67 - 72

Abstrakt

Abstract

Remarkable place of reinforced concrete structures in construction field has been noted in wide number of recent researches. Subsequently, their degradation due to aggressive environment has become the topical problem nowadays. Therefore, the formulation of reliable technique for corroded element strength decrement is of great importance, and could be achieved only with the use of complex experimental and theoretical analysis. In this article an attempt is made to propose the mathematical approach to corrosive process modelling, taking into consideration the specifics of its development. According to thorough literature review on existing studies, main specifics of the process were indicated for further suppositions and assumptions formulation. Accordingly, the complex theoretical investigation with corresponding mathematical computations was conducted and results of analytical modelling were discussed. As the initial data for analytical modelling results of previously conducted experiments were used. Analysis of the obtained results shows rather high correspondence with the real conditions of structural element exploitation, taking into consideration material anisotropy and complexity of the corroded zone spread along the rebar cross-section. Proposed methodology for limit force decrease evaluation in general demonstrates reliable results and could be used for further evaluation of corrosion impacts on reinforced concrete elements bearing capacity.

Słowa kluczowe

  • corrosion
  • steel rebar
  • material anisotropy
  • mathematical modelling
access type Otwarty dostęp

Standardization of human activities as the component of a workflow efficiency model – a research experiment from a meat producing plant

Data publikacji: 25 Jun 2020
Zakres stron: 73 - 77

Abstrakt

Abstract

The aim of the following research it to provide assumptions for creating workflow efficiency model that can be implemented in repeatable production workstations. One of the main components of this model are human activities and their interactions with other elements of working environment: human and artefacts. Recognition of patterns of human behaviours within working processes gives the opportunity to find critical points that influence workflow efficiency.

The subject of research is a working process existing in meat producing plant. The main method used for recognizing human activity patterns was observation and qualitative and quantitative assessments of operational activities based on video registration. Particularly, human activities were analyzed under ergonomics criteria in order to proof dependencies between process efficiency and specific ergonomic factors forming working conditions at meat plant.

Słowa kluczowe

  • workflow
  • standardization
  • ergonomics
  • patterns of activities
  • efficiency
8 Artykułów
access type Otwarty dostęp

Building decision trees based on production knowledge as support in decision-making process

Data publikacji: 25 Jun 2020
Zakres stron: 36 - 40

Abstrakt

Abstract

The article presents sources of production knowledge and thoroughly describes its identification which on the construction of decision trees, and on the construction of knowledge bases for production processes. The problems that arise during the technical preparation of production are briefly characterized and the advanced algorithm with which decision trees can be built is described in detail. A decision tree was built based on real data from the manufacturing company. Decision trees are presented as a method of knowledge representation.

Słowa kluczowe

  • decision trees
  • knowledge identification
  • production engineering
  • production knowledge
  • production processes
access type Otwarty dostęp

Microstructure and residual stress analysis of Strenx 700 MC welded joint

Data publikacji: 25 Jun 2020
Zakres stron: 41 - 44

Abstrakt

Abstract

High strength low alloy (HSLA) steels are a new generation of plain carbon steels with significantly improved mechanical properties while maintaining good weldability with common commercial techniques. Residual stress and microstructural analysis of welded HSLA Strenx 700 MC was carried out in this research. Results have shown that the welding process causes significant grain coarsening in the heat affected zone. The microstructural changes are also accompanied with creation of tensile residual stress field in the weld metal and heat affected zone, reaching up-to depth of 4 mm. Tensile residual stresses are well known for acceleration of fatigue crack initiation and together with coarse grains can lead to significant decrease of the fatigue properties of the welded structure.

Słowa kluczowe

  • Residual stress
  • High strength steel
  • Welding
  • Microstructure
  • Grain coarsening
access type Otwarty dostęp

Identification of health risks from harmful chemical agents – review concerning bisphenol A in workplace

Data publikacji: 25 Jun 2020
Zakres stron: 45 - 49

Abstrakt

Abstract

Bisphenol A (BPA) is an industrial chemical used as an additive in conventional point-of-sale thermal paper receipts, in the production of many polycarbonate plastics, and epoxy resins lignin for food. BPA is xenoestrogen, a foreign compound that is not naturally produced in living organisms, but which acts similarly to natural 17-ß estradiol (natural estrogen). Due to its weak estrogenic activities, BPA exposure may influence multiple endocrine-related pathway, and is associated with prostate and breast cancer, neurobehavioral deficits, heart disease, and obesity. Furthermore, BPA may act as a DNA methylation agent and cause altered gene expression in the brain. Human exposure to bisphenol A is a matter of controversy. This review shows a potential risks in workplace resulting from contact with bisphenol A. The work presents the contribution of BPA exposure levels via dermal contact and the relationship between BPA exposure level and oxidative DNA damage.

Słowa kluczowe

  • bisphenol A
  • health risk
  • harmful chemical agents
  • human exposure
  • DNA oxidative damage
access type Otwarty dostęp

Quality management and safety of food in HACCP system aspect

Data publikacji: 25 Jun 2020
Zakres stron: 50 - 53

Abstrakt

Abstract

The practical implementation of hazard analysis and critical control point (HACCP) and in particular the definition of the critical control points (CCPs) in the food industry is usually a complex structured task. This is particularly the case of food enterprise, where quality/safety manager ability, knowledge of the production processes and ‘‘sensitiveness’’ is usually the discriminate for the proper identification and prioritization of risks. The same applies for the definition of causes which may lead to food safety hazards. This paper addresses the issues of how quality/safety managers can objectively and automatically implement the HACCP principles of hazard analysis in the application of HACCP, which is the identification of risk priorities and of the related CCPs. The proposed methodology combines decision tree analysis approach for the analytical decomposition of the relevant steps in the manufacturing process of ice cream.

Słowa kluczowe

  • quality
  • HACCP system
  • safety of food
  • quality systems
  • competition
access type Otwarty dostęp

Thermal fracture characteristics of an interface crack subjected to temperature variations

Data publikacji: 25 Jun 2020
Zakres stron: 54 - 59

Abstrakt

Abstract

Thermal fracture characteristics – the thermal energy release rate and thermal stress intensity factor of a semi-infinite crack at an interface between the two elastic isotropic materials, subjected to the temperature variations, are considered in this paper. Those characteristics are determined based on application of the linear elastic fracture mechanics (LEFM) concept. Expressions for obtained theoretical solutions are compared to solutions from literature and they are found to be more concise. Influence of the materials change on these two thermal fracture properties were observed, as well as the influence of the thickness ratio of the two layers constituting the interface.

Słowa kluczowe

  • Interface crack
  • Two-layered sample
  • Temperature variation
  • Fracture properties
  • LEFM concept
access type Otwarty dostęp

Cost-quantitative analysis of non-compliance in the internal logistics process

Data publikacji: 25 Jun 2020
Zakres stron: 60 - 66

Abstrakt

Abstract

Internal logistics is a key element of a production process as it specifies product quality, timeliness and value of orders. The purpose of the research was to determine the amount of non-compliance in the selected production process caused by internal logistics operations. The analysis covers both the quantity and type of non-compliance as well as the cost of non-compliance. One of the basic quality management tools was used in the research - Parteo-Lorenz analysis. An attempt was made to identify potential causes of non-compliance. The significant impact of non-compliance arising in internal logistics operations in production costs was pointed out.

Słowa kluczowe

  • quality
  • cost
  • internal logistics process
  • Parteo-Lorenz analysis
access type Otwarty dostęp

Non-uniform corrosion of steel rebar and its influence on reinforced concrete elements` reliability

Data publikacji: 25 Jun 2020
Zakres stron: 67 - 72

Abstrakt

Abstract

Remarkable place of reinforced concrete structures in construction field has been noted in wide number of recent researches. Subsequently, their degradation due to aggressive environment has become the topical problem nowadays. Therefore, the formulation of reliable technique for corroded element strength decrement is of great importance, and could be achieved only with the use of complex experimental and theoretical analysis. In this article an attempt is made to propose the mathematical approach to corrosive process modelling, taking into consideration the specifics of its development. According to thorough literature review on existing studies, main specifics of the process were indicated for further suppositions and assumptions formulation. Accordingly, the complex theoretical investigation with corresponding mathematical computations was conducted and results of analytical modelling were discussed. As the initial data for analytical modelling results of previously conducted experiments were used. Analysis of the obtained results shows rather high correspondence with the real conditions of structural element exploitation, taking into consideration material anisotropy and complexity of the corroded zone spread along the rebar cross-section. Proposed methodology for limit force decrease evaluation in general demonstrates reliable results and could be used for further evaluation of corrosion impacts on reinforced concrete elements bearing capacity.

Słowa kluczowe

  • corrosion
  • steel rebar
  • material anisotropy
  • mathematical modelling
access type Otwarty dostęp

Standardization of human activities as the component of a workflow efficiency model – a research experiment from a meat producing plant

Data publikacji: 25 Jun 2020
Zakres stron: 73 - 77

Abstrakt

Abstract

The aim of the following research it to provide assumptions for creating workflow efficiency model that can be implemented in repeatable production workstations. One of the main components of this model are human activities and their interactions with other elements of working environment: human and artefacts. Recognition of patterns of human behaviours within working processes gives the opportunity to find critical points that influence workflow efficiency.

The subject of research is a working process existing in meat producing plant. The main method used for recognizing human activity patterns was observation and qualitative and quantitative assessments of operational activities based on video registration. Particularly, human activities were analyzed under ergonomics criteria in order to proof dependencies between process efficiency and specific ergonomic factors forming working conditions at meat plant.

Słowa kluczowe

  • workflow
  • standardization
  • ergonomics
  • patterns of activities
  • efficiency

Zaplanuj zdalną konferencję ze Sciendo