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Zeitschriftendaten
Format
Zeitschrift
eISSN
1338-0532
Erstveröffentlichung
03 Mar 2011
Erscheinungsweise
2 Hefte pro Jahr
Sprachen
Englisch

Suche

Volumen 22 (2014): Heft 341 (December 2014)
Special Heft

Zeitschriftendaten
Format
Zeitschrift
eISSN
1338-0532
Erstveröffentlichung
03 Mar 2011
Erscheinungsweise
2 Hefte pro Jahr
Sprachen
Englisch

Suche

20 Artikel
Uneingeschränkter Zugang

Basic Overview of Simulation Optimization

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 11 - 16

Zusammenfassung

Abstract

The paper gives a basic overview of simulation optimization as a significant simulation technology. The computing requirements of simulation optimization cause that the practical usage of simulation optimization without software support is impossible. Therefore, the paper demonstrates typical software approach to simulation optimization and additionally presents the most important algorithms used in simulation optimization. The authors explain basic steps of implementing simulation optimization and present their own procedure. The advantages and disadvantages of simulation optimization are emphasized at the end of this paper.

Schlüsselwörter

  • Simulation optimization
  • Witness simulator
  • production system
  • methods
Uneingeschränkter Zugang

The Art Of Interpretation – Chances And Risks On Interpretation In The Field Of Mobile Testing

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 17 - 22

Zusammenfassung

Abstract

Carrying out a usability test is a demanding process per se. Mobile tests raise this claim because they are subject to real usage conditions and therefore unforeseeable factors. On the one hand there are the technical factors like tools, software and laboratory equipment, but on the other hand there are the human beeings with their knowledge and decision-making. They are taking the selection of tools, methods and data, and they decide in every situation of the process of testing. Using a mobile eye-tracking test, the authors will explain where the sources for interpretation are and when misinterpretation become an error. Technology philosophical considerations on interpretation and hermeneutics have to support the recognition of the potential of interpretation. As a result, misinterpretation can be minimized.

Schlüsselwörter

  • Usability
  • mobile testing
  • errors
  • Philosophy of Technologie
  • interpretation
  • hermeneutics
Uneingeschränkter Zugang

Specification-Based Testing Via Domain Specific Language

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 23 - 28

Zusammenfassung

Abstract

The article presents tCF (testCaseFramework) - a domain specific language with corresponding toolchain for specification-based software testing of embedded software. tCF is designed for efficient preparation of maintainable and intelligible test cases and for testing process automation, as it allows to generate platform specific test cases for various testing levels. The article describes the essential parts of the tCF meta-model and the applied concept of platform specific test cases generators.

Schlüsselwörter

  • Specification-based testing
  • Domain specific language
  • Abstract test case
  • Test design efficiency
Uneingeschränkter Zugang

Active Control Of Oscillation Patterns In Nonlinear Dynamical Systems And Their Mathematical Modelling

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 29 - 33

Zusammenfassung

Abstract

The article deals with the active control of oscillation patterns in nonlinear dynamical systems and its possible use. The purpose of the research is to prove the possibility of oscillations frequency control based on a change of value of singular perturbation parameter placed into a mathematical model of a nonlinear dynamical system at the highest derivative. This parameter is in singular perturbation theory often called small parameter, as ε → 0+. Oscillation frequency change caused by a different value of the parameter is verified by modelling the system in MATLAB.

Schlüsselwörter

  • Nonlinear dynamical system
  • oscillation control
  • MATLAB
Uneingeschränkter Zugang

Towards a Complete Model for Software Component Deployment on Heterogeneous Platform

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 35 - 39

Zusammenfassung

Abstract

This report briefly describes an ongoing research related to optimization of allocating software components to heterogeneous computing platform (which includes CPU, GPU and FPGA). Research goal is also presented, along with current hot topics of the research area, related research teams, and finally results and contribution of my research. It involves mathematical modelling which results in goal function, optimization method which finds a suboptimal solution to the goal function and a software modeling tool which enables graphical representation of the problem at hand and help developers determine component placement in the system design phase.

Schlüsselwörter

  • Heterogeneous computing
  • software components
  • optimization
Uneingeschränkter Zugang

Visible Light Communication Physical Layer Design for Jist Simulation

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 41 - 46

Zusammenfassung

Abstract

Current advances in computer networking consider using visible light spectrum to encode and decode digital data. This approach is relatively non expensive. However, designing appropriate MAC or any other upper layer protocol for Visible Light Communication (VLC) requires appropriate hardware. This paper proposes and implements such hardware simulation (physical layer) that is compatible with existing network stack.

Schlüsselwörter

  • VLC
  • Visible light communication
  • simulation
  • JIST
Uneingeschränkter Zugang

Facial Composite System Using Genetic Algorithm

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 47 - 51

Zusammenfassung

Abstract

The article deals with genetic algorithms and their application in face identification. The purpose of the research is to develop a free and open-source facial composite system using evolutionary algorithms, primarily processes of selection and breeding. The initial testing proved higher quality of the final composites and massive reduction in the composites processing time. System requirements were specified and future research orientation was proposed in order to improve the results.

Schlüsselwörter

  • Genetic algorithm
  • facial composite
  • breeding
  • crossover
Uneingeschränkter Zugang

Removal Of Phenol From Wastewater By Using Low-Cost Catalyst From Metal Production

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 55 - 59

Zusammenfassung

Abstract

Utilization of AOPs (Advanced oxidation processes) as an emerging technology for removing of pollutants from wastewater is developed. In this paper, UV photodegradation was used for removing of phenol from wastewater. As a source of UV radiation medium pressure mercury lamp with output 400W was used. The influence of low-cost catalysts on this process was also monitored. Wastes from metal production, red mud and black nickel mud, were used as catalysts.

Schlüsselwörter

  • Phenol
  • UV photodegradation
  • red mud
  • black nickel mud
Uneingeschränkter Zugang

Removing 3,5-Dichlorophenol from Wastewater by Alternative Adsorbents

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 61 - 66

Zusammenfassung

Abstract

The main objective of this paper is to evaluate an efficiency of 3,5 - dichlorophenol removal from wastewater by using alternative adsorbents. Chlorophenols are organic compounds consisting of a benzene ring, OH groups and also atoms of chlorine. Chlorophenols may have a huge isomere variety that means there are differences in their chemical and physical properties. Due to their toxicity it is necessary to remove them from waste water and in this paper an alternative way of such process is described.

Schlüsselwörter

  • Red mud
  • Black nickel mud
  • Lemna minor
Uneingeschränkter Zugang

Perspective of Cross-Cutting Criteria as a Major Instrument to Determination of Critical Infrastructure in the Czech Republic

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 67 - 74

Zusammenfassung

Abstract

This paper is concerned by issue of cross-cutting criteria by view of European Union and relevant Member States and regional level. Therefore it defines general solution for designation process of critical infrastructure elements. The paper consequently presents comparison of cross-cutting criteria in the Czech Republic and European Union. Thoughtful look of crosscutting criteria and regional critical infrastructure is following collated by present knowledge in realm of critical infrastructure in the Czech Republic.

Schlüsselwörter

  • Critical infrastructure
  • cross-cutting criteria
  • regional critical infrastructure
Uneingeschränkter Zugang

Complex Logistics Strategy for Industrial Companies in Slovakia

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 77 - 81

Zusammenfassung

Abstract

Presented paper is a part of the dissertation thesis titled as “A proposal to develop Complex Logistics Strategy for industrial companies. The result of the thesis will be a methodology for developing a Complex Logistics Strategy for industrial companies in Slovakia. The main aim of the paper is to present some trends and strategies in Logistics and clarify the need of resolving the issue of Logistics Strategy based on the theoretical knowledge, case studies and analysis of current state of Logistics Strategies in industrial companies in Slovakia and other European countries.

Schlüsselwörter

  • Logistics Strategy
  • Industrial companies
  • Slovakia
Uneingeschränkter Zugang

Risk Management in Companies –A Questionnaire as an Instrument for Analysing the Present Situation

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 83 - 88

Zusammenfassung

Abstract

The topic risk management receives new impulses in the context of the financial and economic crisis in the years 2007 until 2011 as well as the question whether companies took consequences. The article briefly describes the importance of risk management and then explained the theoretical principles of empirical methods. Excerpts from developed questionnaire will be presented.

Schlüsselwörter

  • Industrial management
  • risk management
  • ermirical research
  • qualitative and quantitative survey
Uneingeschränkter Zugang

Value Creation in the Context of Sustainable Corporate Social Responsibility

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 89 - 94

Zusammenfassung

Abstract

Under the influence of the new rules of the economy and the society, companies are achieving a notional line of a necessary change in the approach to creating new value, wealth. Implementation of changes in the system of wealth creation requires a review of existing assumptions of unlimited growth of the global economy and wealth creation in the environment accepting economic interests, society and the environment as a holistic unit. The main purpose of this paper is the clarification of a new requirements for business, presentation of the questionnaire survey Sustainable Corporate Social Responsibility and inform on value creation in the context of Sustainable Corporate Social Responsibility.

Schlüsselwörter

  • Corporate social responsibility
  • sustainable development
  • value creation
Uneingeschränkter Zugang

Diesel Effect Problem Solving During Injection Moulding

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 97 - 102

Zusammenfassung

Abstract

Study describes principles of diesel effect creation during thermoplastic injection moulding as a consequence of wrong injection conditions and poor venting system design. On real example, study shows sequence of all steps to eliminate this sort of material degradation with minimal costs in phase when mould is already made. As a first, process parameters were optimized by CAE simulation to minimize cavity internal gasses creation. Finally the specific mould modifications were suggested to improve the effectiveness of venting system.

Schlüsselwörter

  • Diesel effect
  • burning marks
  • venting of injection moulds
Uneingeschränkter Zugang

Rotary Ultrasonic Machining of Poly-Crystalline Cubic Boron Nitride

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 103 - 108

Zusammenfassung

Abstract

Poly-crystalline cubic boron nitride (PCBN) is one of the hardest material. Generally, so hard materials could not be machined by conventional machining methods. Therefore, for this purpose, advanced machining methods have been designed. Rotary ultrasonic machining (RUM) is included among them. RUM is based on abrasive removing mechanism of ultrasonic vibrating diamond particles, which are bonded on active part of rotating tool. It is suitable especially for machining hard and brittle materials (such as glass and ceramics). This contribution investigates this advanced machining method during machining of PCBN.

Schlüsselwörter

  • Rotary ultrasonic machining
  • cubic boron nitride
  • very hard materials
Uneingeschränkter Zugang

Ways of Comparation of the Fibre Orientation in Injection Moulding Parts

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 109 - 114

Zusammenfassung

Abstract

The fibre orientation in short fibre reinforced thermoplastics depends on injection moulding technology parameters. The aim of this paper is to propose possibilities for comparing fibre orientation of the real sample and the result from simulation software. Fibre orientation of selected injection moulding part is simulated. In some selected points secondorder tensor of orientation was estimated. Stereological metallography was used for possibility of comparison these results with experimental ones. An experimental result of estimation of degree of fibre orientation is described. The use of stereological metallography allows very simple and effective experimental estimation of short glass fibre orientation, which can be used for experimental verification of numerical simulation model, which can be optimized to obtained coincidence with experiments.

Schlüsselwörter

  • Injection moulding
  • fibre orientation
  • stereology
  • numeric simulation
Uneingeschränkter Zugang

The Tool Life of Ball Nose end Mill Depending on the Different Types of Ramping

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 115 - 121

Zusammenfassung

Abstract

The article deals with the cutting tool wear measurement process and tool life of ball nose end mill depending on upward ramping and downward ramping. The aim was to determine and compare the wear (tool life) of ball nose end mill for different types of copy milling operations, as well as to specify particular steps of the measurement process. In addition, we examined and observed cutter contact areas of ball nose end mill with machined material. For tool life test, DMG DMU 85 monoBLOCK 5-axis CNC milling machine was used. In the experiment, cutting speed, feed rate, axial depth of cut and radial depth of cut were not changed. The cutting tool wear was measured on Zoller Genius 3s universal measuring machine. The results show different tool life of ball nose end mills depending on the copy milling strategy.

Schlüsselwörter

  • Tool life
  • ball nose end mill
  • copy milling
Uneingeschränkter Zugang

Overview of Cr2N And Cr2N/Ag Coatings On Cr-V Ledeburitic Steel: Mechanical Properties and Adhesion

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 125 - 130

Zusammenfassung

Abstract

Samples made from Vanadis 6 PM ledeburitic tool steel were surface machined, ground and mirror polished. Prior the deposition, they were heat treated to a hardness of 60 HRC. Cr2N- and Cr2N/Ag-coatings were deposited by magnetron sputtering technique, using pure Cr and Ag targets, in a composite low pressure nitrogen/argon atmosphere and at a temperature of 500 °C. The contents of silver in Cr2N/Ag coatings were established 3, 7, 11 and 15 wt. %. Incorporation of silver in the Cr2N-matrix influence the growth rate, namely from the content of 11 wt. %. The nanohardness and Young´s modulus do not change until the content of 11 wt. % where slightly increased but further increasing of silver led to decreasing these values rapidly. The best adhesion was established for coatings with 3 and 7 wt. % of silver.

Schlüsselwörter

  • Cr2N/Ag coatings
  • growth rate
  • nanohardness
  • Young´s modulus
  • adhesion
Uneingeschränkter Zugang

Study of the Sensitization on the Grain Boundary in Austenitic Stainless Steel Aisi 316

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 131 - 136

Zusammenfassung

Abstract

Intergranular corrosion (IGC) is one of the major problems in austenitic stainless steels. This type of corrosion is caused by precipitation of secondary phases on grain boundaries (GB). Precipitation of the secondary phases can lead to formation of chromium depleted zones in the vicinity of grain boundaries. Mount of the sensitization of material is characterized by the degree of sensitization (DOS). Austenitic stainless steel AISI 316 as experimental material had been chosen. The samples for the study of sensitization were solution annealed on 1100 °C for 60 min followed by water quenching and then sensitization by isothermal annealing on 700 °C and 650 °C with holding time from 15 to 600 min. Transmission electron microscopy (TEM) was used for identification of secondary phases. Electron backscattered diffraction (EBSD) was applied for characterization of grain boundary structure as one of the factors which influences on DOS.

Schlüsselwörter

  • Austenitic stainless steel
  • microstructure
  • precipitation
  • grain boundary
Uneingeschränkter Zugang

Structural Characterization of (Re)Bco Layer Deposited by Pld and Mocvd Techniques

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 137 - 142

Zusammenfassung

Abstract

(RE)BCO thin films prepared by PLD and MOCVD techniques were investigated to characterize structural defects - outgrowths in thin film. For this purpose SEM, EDX analysis and LSCM were used. Outgrowths are often penetrating into the thin films. Evident differences in chemical heterogeneity, outgrowth morphology and outgrowths density between PLD and MOCVD thin films were proven in this study.

Schlüsselwörter

  • (RE)BCO thin film
  • HTS tape
  • outgrowths
  • PLD
  • MOCVD
20 Artikel
Uneingeschränkter Zugang

Basic Overview of Simulation Optimization

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 11 - 16

Zusammenfassung

Abstract

The paper gives a basic overview of simulation optimization as a significant simulation technology. The computing requirements of simulation optimization cause that the practical usage of simulation optimization without software support is impossible. Therefore, the paper demonstrates typical software approach to simulation optimization and additionally presents the most important algorithms used in simulation optimization. The authors explain basic steps of implementing simulation optimization and present their own procedure. The advantages and disadvantages of simulation optimization are emphasized at the end of this paper.

Schlüsselwörter

  • Simulation optimization
  • Witness simulator
  • production system
  • methods
Uneingeschränkter Zugang

The Art Of Interpretation – Chances And Risks On Interpretation In The Field Of Mobile Testing

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 17 - 22

Zusammenfassung

Abstract

Carrying out a usability test is a demanding process per se. Mobile tests raise this claim because they are subject to real usage conditions and therefore unforeseeable factors. On the one hand there are the technical factors like tools, software and laboratory equipment, but on the other hand there are the human beeings with their knowledge and decision-making. They are taking the selection of tools, methods and data, and they decide in every situation of the process of testing. Using a mobile eye-tracking test, the authors will explain where the sources for interpretation are and when misinterpretation become an error. Technology philosophical considerations on interpretation and hermeneutics have to support the recognition of the potential of interpretation. As a result, misinterpretation can be minimized.

Schlüsselwörter

  • Usability
  • mobile testing
  • errors
  • Philosophy of Technologie
  • interpretation
  • hermeneutics
Uneingeschränkter Zugang

Specification-Based Testing Via Domain Specific Language

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 23 - 28

Zusammenfassung

Abstract

The article presents tCF (testCaseFramework) - a domain specific language with corresponding toolchain for specification-based software testing of embedded software. tCF is designed for efficient preparation of maintainable and intelligible test cases and for testing process automation, as it allows to generate platform specific test cases for various testing levels. The article describes the essential parts of the tCF meta-model and the applied concept of platform specific test cases generators.

Schlüsselwörter

  • Specification-based testing
  • Domain specific language
  • Abstract test case
  • Test design efficiency
Uneingeschränkter Zugang

Active Control Of Oscillation Patterns In Nonlinear Dynamical Systems And Their Mathematical Modelling

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 29 - 33

Zusammenfassung

Abstract

The article deals with the active control of oscillation patterns in nonlinear dynamical systems and its possible use. The purpose of the research is to prove the possibility of oscillations frequency control based on a change of value of singular perturbation parameter placed into a mathematical model of a nonlinear dynamical system at the highest derivative. This parameter is in singular perturbation theory often called small parameter, as ε → 0+. Oscillation frequency change caused by a different value of the parameter is verified by modelling the system in MATLAB.

Schlüsselwörter

  • Nonlinear dynamical system
  • oscillation control
  • MATLAB
Uneingeschränkter Zugang

Towards a Complete Model for Software Component Deployment on Heterogeneous Platform

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 35 - 39

Zusammenfassung

Abstract

This report briefly describes an ongoing research related to optimization of allocating software components to heterogeneous computing platform (which includes CPU, GPU and FPGA). Research goal is also presented, along with current hot topics of the research area, related research teams, and finally results and contribution of my research. It involves mathematical modelling which results in goal function, optimization method which finds a suboptimal solution to the goal function and a software modeling tool which enables graphical representation of the problem at hand and help developers determine component placement in the system design phase.

Schlüsselwörter

  • Heterogeneous computing
  • software components
  • optimization
Uneingeschränkter Zugang

Visible Light Communication Physical Layer Design for Jist Simulation

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 41 - 46

Zusammenfassung

Abstract

Current advances in computer networking consider using visible light spectrum to encode and decode digital data. This approach is relatively non expensive. However, designing appropriate MAC or any other upper layer protocol for Visible Light Communication (VLC) requires appropriate hardware. This paper proposes and implements such hardware simulation (physical layer) that is compatible with existing network stack.

Schlüsselwörter

  • VLC
  • Visible light communication
  • simulation
  • JIST
Uneingeschränkter Zugang

Facial Composite System Using Genetic Algorithm

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 47 - 51

Zusammenfassung

Abstract

The article deals with genetic algorithms and their application in face identification. The purpose of the research is to develop a free and open-source facial composite system using evolutionary algorithms, primarily processes of selection and breeding. The initial testing proved higher quality of the final composites and massive reduction in the composites processing time. System requirements were specified and future research orientation was proposed in order to improve the results.

Schlüsselwörter

  • Genetic algorithm
  • facial composite
  • breeding
  • crossover
Uneingeschränkter Zugang

Removal Of Phenol From Wastewater By Using Low-Cost Catalyst From Metal Production

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 55 - 59

Zusammenfassung

Abstract

Utilization of AOPs (Advanced oxidation processes) as an emerging technology for removing of pollutants from wastewater is developed. In this paper, UV photodegradation was used for removing of phenol from wastewater. As a source of UV radiation medium pressure mercury lamp with output 400W was used. The influence of low-cost catalysts on this process was also monitored. Wastes from metal production, red mud and black nickel mud, were used as catalysts.

Schlüsselwörter

  • Phenol
  • UV photodegradation
  • red mud
  • black nickel mud
Uneingeschränkter Zugang

Removing 3,5-Dichlorophenol from Wastewater by Alternative Adsorbents

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 61 - 66

Zusammenfassung

Abstract

The main objective of this paper is to evaluate an efficiency of 3,5 - dichlorophenol removal from wastewater by using alternative adsorbents. Chlorophenols are organic compounds consisting of a benzene ring, OH groups and also atoms of chlorine. Chlorophenols may have a huge isomere variety that means there are differences in their chemical and physical properties. Due to their toxicity it is necessary to remove them from waste water and in this paper an alternative way of such process is described.

Schlüsselwörter

  • Red mud
  • Black nickel mud
  • Lemna minor
Uneingeschränkter Zugang

Perspective of Cross-Cutting Criteria as a Major Instrument to Determination of Critical Infrastructure in the Czech Republic

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 67 - 74

Zusammenfassung

Abstract

This paper is concerned by issue of cross-cutting criteria by view of European Union and relevant Member States and regional level. Therefore it defines general solution for designation process of critical infrastructure elements. The paper consequently presents comparison of cross-cutting criteria in the Czech Republic and European Union. Thoughtful look of crosscutting criteria and regional critical infrastructure is following collated by present knowledge in realm of critical infrastructure in the Czech Republic.

Schlüsselwörter

  • Critical infrastructure
  • cross-cutting criteria
  • regional critical infrastructure
Uneingeschränkter Zugang

Complex Logistics Strategy for Industrial Companies in Slovakia

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 77 - 81

Zusammenfassung

Abstract

Presented paper is a part of the dissertation thesis titled as “A proposal to develop Complex Logistics Strategy for industrial companies. The result of the thesis will be a methodology for developing a Complex Logistics Strategy for industrial companies in Slovakia. The main aim of the paper is to present some trends and strategies in Logistics and clarify the need of resolving the issue of Logistics Strategy based on the theoretical knowledge, case studies and analysis of current state of Logistics Strategies in industrial companies in Slovakia and other European countries.

Schlüsselwörter

  • Logistics Strategy
  • Industrial companies
  • Slovakia
Uneingeschränkter Zugang

Risk Management in Companies –A Questionnaire as an Instrument for Analysing the Present Situation

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 83 - 88

Zusammenfassung

Abstract

The topic risk management receives new impulses in the context of the financial and economic crisis in the years 2007 until 2011 as well as the question whether companies took consequences. The article briefly describes the importance of risk management and then explained the theoretical principles of empirical methods. Excerpts from developed questionnaire will be presented.

Schlüsselwörter

  • Industrial management
  • risk management
  • ermirical research
  • qualitative and quantitative survey
Uneingeschränkter Zugang

Value Creation in the Context of Sustainable Corporate Social Responsibility

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 89 - 94

Zusammenfassung

Abstract

Under the influence of the new rules of the economy and the society, companies are achieving a notional line of a necessary change in the approach to creating new value, wealth. Implementation of changes in the system of wealth creation requires a review of existing assumptions of unlimited growth of the global economy and wealth creation in the environment accepting economic interests, society and the environment as a holistic unit. The main purpose of this paper is the clarification of a new requirements for business, presentation of the questionnaire survey Sustainable Corporate Social Responsibility and inform on value creation in the context of Sustainable Corporate Social Responsibility.

Schlüsselwörter

  • Corporate social responsibility
  • sustainable development
  • value creation
Uneingeschränkter Zugang

Diesel Effect Problem Solving During Injection Moulding

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 97 - 102

Zusammenfassung

Abstract

Study describes principles of diesel effect creation during thermoplastic injection moulding as a consequence of wrong injection conditions and poor venting system design. On real example, study shows sequence of all steps to eliminate this sort of material degradation with minimal costs in phase when mould is already made. As a first, process parameters were optimized by CAE simulation to minimize cavity internal gasses creation. Finally the specific mould modifications were suggested to improve the effectiveness of venting system.

Schlüsselwörter

  • Diesel effect
  • burning marks
  • venting of injection moulds
Uneingeschränkter Zugang

Rotary Ultrasonic Machining of Poly-Crystalline Cubic Boron Nitride

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 103 - 108

Zusammenfassung

Abstract

Poly-crystalline cubic boron nitride (PCBN) is one of the hardest material. Generally, so hard materials could not be machined by conventional machining methods. Therefore, for this purpose, advanced machining methods have been designed. Rotary ultrasonic machining (RUM) is included among them. RUM is based on abrasive removing mechanism of ultrasonic vibrating diamond particles, which are bonded on active part of rotating tool. It is suitable especially for machining hard and brittle materials (such as glass and ceramics). This contribution investigates this advanced machining method during machining of PCBN.

Schlüsselwörter

  • Rotary ultrasonic machining
  • cubic boron nitride
  • very hard materials
Uneingeschränkter Zugang

Ways of Comparation of the Fibre Orientation in Injection Moulding Parts

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 109 - 114

Zusammenfassung

Abstract

The fibre orientation in short fibre reinforced thermoplastics depends on injection moulding technology parameters. The aim of this paper is to propose possibilities for comparing fibre orientation of the real sample and the result from simulation software. Fibre orientation of selected injection moulding part is simulated. In some selected points secondorder tensor of orientation was estimated. Stereological metallography was used for possibility of comparison these results with experimental ones. An experimental result of estimation of degree of fibre orientation is described. The use of stereological metallography allows very simple and effective experimental estimation of short glass fibre orientation, which can be used for experimental verification of numerical simulation model, which can be optimized to obtained coincidence with experiments.

Schlüsselwörter

  • Injection moulding
  • fibre orientation
  • stereology
  • numeric simulation
Uneingeschränkter Zugang

The Tool Life of Ball Nose end Mill Depending on the Different Types of Ramping

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 115 - 121

Zusammenfassung

Abstract

The article deals with the cutting tool wear measurement process and tool life of ball nose end mill depending on upward ramping and downward ramping. The aim was to determine and compare the wear (tool life) of ball nose end mill for different types of copy milling operations, as well as to specify particular steps of the measurement process. In addition, we examined and observed cutter contact areas of ball nose end mill with machined material. For tool life test, DMG DMU 85 monoBLOCK 5-axis CNC milling machine was used. In the experiment, cutting speed, feed rate, axial depth of cut and radial depth of cut were not changed. The cutting tool wear was measured on Zoller Genius 3s universal measuring machine. The results show different tool life of ball nose end mills depending on the copy milling strategy.

Schlüsselwörter

  • Tool life
  • ball nose end mill
  • copy milling
Uneingeschränkter Zugang

Overview of Cr2N And Cr2N/Ag Coatings On Cr-V Ledeburitic Steel: Mechanical Properties and Adhesion

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 125 - 130

Zusammenfassung

Abstract

Samples made from Vanadis 6 PM ledeburitic tool steel were surface machined, ground and mirror polished. Prior the deposition, they were heat treated to a hardness of 60 HRC. Cr2N- and Cr2N/Ag-coatings were deposited by magnetron sputtering technique, using pure Cr and Ag targets, in a composite low pressure nitrogen/argon atmosphere and at a temperature of 500 °C. The contents of silver in Cr2N/Ag coatings were established 3, 7, 11 and 15 wt. %. Incorporation of silver in the Cr2N-matrix influence the growth rate, namely from the content of 11 wt. %. The nanohardness and Young´s modulus do not change until the content of 11 wt. % where slightly increased but further increasing of silver led to decreasing these values rapidly. The best adhesion was established for coatings with 3 and 7 wt. % of silver.

Schlüsselwörter

  • Cr2N/Ag coatings
  • growth rate
  • nanohardness
  • Young´s modulus
  • adhesion
Uneingeschränkter Zugang

Study of the Sensitization on the Grain Boundary in Austenitic Stainless Steel Aisi 316

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 131 - 136

Zusammenfassung

Abstract

Intergranular corrosion (IGC) is one of the major problems in austenitic stainless steels. This type of corrosion is caused by precipitation of secondary phases on grain boundaries (GB). Precipitation of the secondary phases can lead to formation of chromium depleted zones in the vicinity of grain boundaries. Mount of the sensitization of material is characterized by the degree of sensitization (DOS). Austenitic stainless steel AISI 316 as experimental material had been chosen. The samples for the study of sensitization were solution annealed on 1100 °C for 60 min followed by water quenching and then sensitization by isothermal annealing on 700 °C and 650 °C with holding time from 15 to 600 min. Transmission electron microscopy (TEM) was used for identification of secondary phases. Electron backscattered diffraction (EBSD) was applied for characterization of grain boundary structure as one of the factors which influences on DOS.

Schlüsselwörter

  • Austenitic stainless steel
  • microstructure
  • precipitation
  • grain boundary
Uneingeschränkter Zugang

Structural Characterization of (Re)Bco Layer Deposited by Pld and Mocvd Techniques

Online veröffentlicht: 25 Nov 2014
Seitenbereich: 137 - 142

Zusammenfassung

Abstract

(RE)BCO thin films prepared by PLD and MOCVD techniques were investigated to characterize structural defects - outgrowths in thin film. For this purpose SEM, EDX analysis and LSCM were used. Outgrowths are often penetrating into the thin films. Evident differences in chemical heterogeneity, outgrowth morphology and outgrowths density between PLD and MOCVD thin films were proven in this study.

Schlüsselwörter

  • (RE)BCO thin film
  • HTS tape
  • outgrowths
  • PLD
  • MOCVD

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