1 March 20, 2020
Articles
1. Alexey P. Ilyin, Vladimir K. Pyankov, Artem A. Prisyazhnyuk
Protection of Pipeline Elements from Stress Corrosion Cracking
European Journal of Technology and Design, 2020, 8(1): 3-9.
Number of views: 713 Download in PDF
2. Maria Musa Mukaddas, Umar Hassan, Fatima M. Abubakar, Ziyaulhaq HaladuEuropean Journal of Technology and Design, 2020, 8(1): 3-9.
Abstract:
The paper analyzes the causes of corrosion cracking under stress of main pipelines. To reduce the likelihood of cracking, it is proposed to insulate the inner wall of the main pipeline with a mineral-polymer coating. A mathematical model of heat transfer through a multilayer cylindrical wall in the soil is constructed, which takes into account the influence of soil temperature, the depth of the main pipeline on the heat flow through the pipe wall. As a result, the use of an internal insulating mineral-polymer coating reduces the heat flux through the pipe wall by almost half, which reduces the likelihood of stress corrosion cracking.
The paper analyzes the causes of corrosion cracking under stress of main pipelines. To reduce the likelihood of cracking, it is proposed to insulate the inner wall of the main pipeline with a mineral-polymer coating. A mathematical model of heat transfer through a multilayer cylindrical wall in the soil is constructed, which takes into account the influence of soil temperature, the depth of the main pipeline on the heat flow through the pipe wall. As a result, the use of an internal insulating mineral-polymer coating reduces the heat flux through the pipe wall by almost half, which reduces the likelihood of stress corrosion cracking.
Number of views: 713 Download in PDF
Appraisal of Planning and Control as Management Tool for Optimum Productivity on Construction Sites
European Journal of Technology and Design, 2020, 8(1): 10-19.
Number of views: 712 Download in PDF
3. Maria Musa Mukaddas, Bala Hassan, Tasleem SaniEuropean Journal of Technology and Design, 2020, 8(1): 10-19.
Abstract:
An appraisal of planning and control as management tool for optimum productivity on construction sites was assessed with the view of finding the various ways to establish the best alternative planning and control techniques for some particular kinds of projects. Questionnaires were distributed to professionals. Not all construction firms have a separate planning department, this means that they integrate the planning job into other department, and out of the 43 respondents, none had PhD, while majority had M.Sc. A minimum level of planning tools and procedure use is important but what kind of tools is of no importance. However, the most used planning technique for building projects is the Bar chart/Gantt chart and it was discovered that its choice was due to the reasons being that they are simple and easy to handle and manipulate, flexible and it graphically presents the activities with their start time and dates along with links and overlaps. It is suitable for all kinds of project irrespective of its size and nature. Planning tools like progress curve, line of balance, project evaluation and review techniques (PERT) are almost non-existence. The major challenge encountered on site when implementing the plan is delay in completion of the works and dispute does arise between the construction team. Most planners nowadays use computer Aided software to prepare and design their plan, and the major software used is Microsoft project among others. Furthermore, it encourages project managers to believe that although planning does not guarantee project success, lack of planning will probably guarantee failure. Finally, it was revealed from this research that planning is never an easy undertaking but it requires attention since it helps to achieve success. Similarly, Planning is considered a central element of modern project management, the assumption behind the position is that planning reduces uncertainty and increases the likelihood of project success.
An appraisal of planning and control as management tool for optimum productivity on construction sites was assessed with the view of finding the various ways to establish the best alternative planning and control techniques for some particular kinds of projects. Questionnaires were distributed to professionals. Not all construction firms have a separate planning department, this means that they integrate the planning job into other department, and out of the 43 respondents, none had PhD, while majority had M.Sc. A minimum level of planning tools and procedure use is important but what kind of tools is of no importance. However, the most used planning technique for building projects is the Bar chart/Gantt chart and it was discovered that its choice was due to the reasons being that they are simple and easy to handle and manipulate, flexible and it graphically presents the activities with their start time and dates along with links and overlaps. It is suitable for all kinds of project irrespective of its size and nature. Planning tools like progress curve, line of balance, project evaluation and review techniques (PERT) are almost non-existence. The major challenge encountered on site when implementing the plan is delay in completion of the works and dispute does arise between the construction team. Most planners nowadays use computer Aided software to prepare and design their plan, and the major software used is Microsoft project among others. Furthermore, it encourages project managers to believe that although planning does not guarantee project success, lack of planning will probably guarantee failure. Finally, it was revealed from this research that planning is never an easy undertaking but it requires attention since it helps to achieve success. Similarly, Planning is considered a central element of modern project management, the assumption behind the position is that planning reduces uncertainty and increases the likelihood of project success.
Number of views: 712 Download in PDF
The Upshot of Time Overrun in Building Project
European Journal of Technology and Design, 2020, 8(1): 20-25.
Number of views: 728 Download in PDF
4. Vo Quang Nha, Huynh Thi Thuy Linh, Nikolai I. Gorbachuk, Ngo Xuan CuongEuropean Journal of Technology and Design, 2020, 8(1): 20-25.
Abstract:
The effect of time overrun in building construction projects was assessed with the view of finding the possible ways of mitigating the effects of time overrun in construction project. A quantitative research method was adopted and data were collected by means of questionnaires. Research findings indicates that the time factor that have impact on construction project delivery include poor budgeting system, lack of proper cash flow, poor resource utilization, improper time schedule plan, unnecessary delays, poor management of time. The view of contractors regarding time in construction is experiencing a positive change from factors that require less concern or factors needed for reference purpose to those factors that determine the success of a project, factors that help in avoiding liquidated damages and the major factors to be considered in the preparation and submission of tender. The research also indicates that various relationships exist between construction project time and cost depending on the perspective in which it is viewed and value considered, relationship ranging from a trade-off to direct professional relationship all explain how related cost and time are in construction projects.
The effect of time overrun in building construction projects was assessed with the view of finding the possible ways of mitigating the effects of time overrun in construction project. A quantitative research method was adopted and data were collected by means of questionnaires. Research findings indicates that the time factor that have impact on construction project delivery include poor budgeting system, lack of proper cash flow, poor resource utilization, improper time schedule plan, unnecessary delays, poor management of time. The view of contractors regarding time in construction is experiencing a positive change from factors that require less concern or factors needed for reference purpose to those factors that determine the success of a project, factors that help in avoiding liquidated damages and the major factors to be considered in the preparation and submission of tender. The research also indicates that various relationships exist between construction project time and cost depending on the perspective in which it is viewed and value considered, relationship ranging from a trade-off to direct professional relationship all explain how related cost and time are in construction projects.
Number of views: 728 Download in PDF
Equivalent Circuit of Al/SiO2/n-Si Structures Irradiated by Helium Ions with Energy 5 MeV at Fluence 1012 cm-2
European Journal of Technology and Design, 2020, 8(1): 26-32.
Number of views: 724 Download in PDF
5. Viktor Ya. TsvetkovEuropean Journal of Technology and Design, 2020, 8(1): 26-32.
Abstract:
Recently, metal-oxide-semiconductor structures using silicon dioxide is the most common microelectronic structures. Silicon dioxide (SiO2) is used to isolate pole gate dielectric, and it is also the main material used to make stable, high-performance devices of integrated circuits. Electrical parameters at the Si-SiO2 interface created by gamma irradiation depends on the type and penetration of the implanted ions. The paper provides a method of determining the equivalent circuit of a metal-oxide-semiconductor structure to determine its electrical parameters. The structure Al/SiO2/n-Si irradiated by helium ions with energy 5 MeV at fluence 1012 cm-2 are studied to find its equivalent circuit. Result, the structure’s equivalent circuit composing of a resistor and parallel RC circuit in series does not describe the frequency dependence of the electric loss in an alternating current at the frequency range 20 – 3·106 Hz. In the inversion region with voltage U = -40 V, equivalent circuits are developed and implemented in a wide frequency range. These circuits allow us to easily calculate electrical parameters through the frequency dependence of impedance characteristics.
Recently, metal-oxide-semiconductor structures using silicon dioxide is the most common microelectronic structures. Silicon dioxide (SiO2) is used to isolate pole gate dielectric, and it is also the main material used to make stable, high-performance devices of integrated circuits. Electrical parameters at the Si-SiO2 interface created by gamma irradiation depends on the type and penetration of the implanted ions. The paper provides a method of determining the equivalent circuit of a metal-oxide-semiconductor structure to determine its electrical parameters. The structure Al/SiO2/n-Si irradiated by helium ions with energy 5 MeV at fluence 1012 cm-2 are studied to find its equivalent circuit. Result, the structure’s equivalent circuit composing of a resistor and parallel RC circuit in series does not describe the frequency dependence of the electric loss in an alternating current at the frequency range 20 – 3·106 Hz. In the inversion region with voltage U = -40 V, equivalent circuits are developed and implemented in a wide frequency range. These circuits allow us to easily calculate electrical parameters through the frequency dependence of impedance characteristics.
Number of views: 724 Download in PDF
Formation of the World Picture
European Journal of Technology and Design, 2020, 8(1): 33-37.
Number of views: 727 Download in PDF
6. European Journal of Technology and Design, 2020, 8(1): 33-37.
Abstract:
The article describes model of formation of the picture of the world. It is shown that every individual has personalized picture of the world. Personalized picture of the world is being formed as the objective necessity of development. The article notes that there are three pictures of the world: scientific, everyday world picture and personalized. Personalized picture of the world is formed by education. Personalized picture of the world is approaching the everyday picture of the world on the stage of training. Personalized picture of the world is approaching a scientific picture of the world at the stage of research. Personalized picture of the world can surpass the scientific picture of the world, which is the basis of development.
The article describes model of formation of the picture of the world. It is shown that every individual has personalized picture of the world. Personalized picture of the world is being formed as the objective necessity of development. The article notes that there are three pictures of the world: scientific, everyday world picture and personalized. Personalized picture of the world is formed by education. Personalized picture of the world is approaching the everyday picture of the world on the stage of training. Personalized picture of the world is approaching a scientific picture of the world at the stage of research. Personalized picture of the world can surpass the scientific picture of the world, which is the basis of development.
Number of views: 727 Download in PDF