Journal & Issues

Volume 19 (2022): Issue 2 (December 2022)

Volume 19 (2022): Issue 1 (June 2022)

Volume 18 (2021): Issue 2 (December 2021)

Volume 18 (2021): Issue 1 (June 2021)

Volume 17 (2020): Issue 2 (December 2020)

Volume 17 (2020): Issue 1 (June 2020)

Volume 16 (2019): Issue 2 (December 2019)

Volume 16 (2019): Issue 1 (June 2019)

Journal Details
Format
Journal
eISSN
2668-4217
First Published
30 Jul 2019
Publication timeframe
2 times per year
Languages
English

Search

Volume 17 (2020): Issue 2 (December 2020)

Journal Details
Format
Journal
eISSN
2668-4217
First Published
30 Jul 2019
Publication timeframe
2 times per year
Languages
English

Search

10 Articles
Open Access

Editorial: Second Volume of Acta Marisiensis. Seria Technologica

Published Online: 12 Dec 2020
Page range: 1 - 3

Abstract

Open Access

Effects of Sintering Temperature on Structural and Electrical Properties of Fe3+ Doping PZT Ceramics

Published Online: 12 Dec 2020
Page range: 4 - 7

Abstract

Abstract

The influence of the sintering temperature on the structure and on the hysteresis loops of Fe3+ doped Pb(ZrxTi1-x)O3 system has been investigated. Three compositions have been selected in the following mode: one in rhombohedral region, one in MPB region and one in tetragonal region have been obtained by solid state reaction technique. Sintering has been carried out at 12000C and 12500C respectively. The nature of the phases has been investigated in detail using X-ray diffraction analysis (XRD). All the sintered samples reveal a perovskite type structure. The surfaces have been lapped and metalized in order to obtaine the hysteresis loops at room temperature. The results showed a similar behaviour with “hard” PZT ceramics.

Keywords

  • doped PZT
  • hard PZT
  • dielectric properties
  • piezoelectric properties
Open Access

Buckling Analysis of Innovative Corrugated Column by using Response Surface Methodology

Published Online: 12 Dec 2020
Page range: 8 - 17

Abstract

Abstract

Tubular steel structures with slender compression cross-sections are prone to local buckling. In this paper the axial compression is investigation of the innovative fabricated structural steel column consisting of sinusoidal corrugated pattern. When it comes to the design of compressive individuals, buckling is a crucial layout provision. The paper describes the effect of variation in the sectional properties like mean diameter, thickness, amplitude, and frequency of corrugation on the buckling axial load. A quadratic model was developed to correlate the independent variables for maximum buckling load by using central composite design (CCD) method. Subsequently ANOVA, a statistical tool is used to analyse and compare the different combinations and finding the most influential factor on buckling load. Response surface methodology is adopted to review the interaction models between the different combinations.

Keywords

  • Innovative hollow column
  • Linear buckling analysis
  • ANSYS
  • Design of experiment
  • Response surface method
Open Access

Aspects Regarding the Online Modular Education System Compared with the Classical Onsite System

Published Online: 12 Dec 2020
Page range: 18 - 23

Abstract

Abstract

In according with the situation created by the pandemics of the world [4,6,7,8,9,10], the Covid-19 viruses were affected the all fields of activity from the all domains, like as: industrial domains, tourism, commercial, even of the educational system at all levels [1,2]. In this context our university, George Emil Palade University of Medicine, Pharmacy, Science and Technology of Targu Mures, it had to move from the classical educational system to approach of the new online modular system. This forced adaptation presents a lots of problems, especially of the all specializations within the Faculty of Engineering and Information Technology, where there are practical activities that involve laboratories with practical execution they cannot be performed by the online system. After an experience gained of almost 4 months of online activity, more several negative aspects are configured to be analyzed in order to find constructive solutions for optimizing the online educational system [1]. The present paper proposes to identification of a questionnaire addressed for the students as well as to the teachers from the Faculty of Engineering and Information Technology of UMFST “G.E.Palade” of Tg.Mures. Following the analysis of the all results of the questionnaire, the deficiencies of the problems raised by the technical disciplines that require phisicals practical applications in laboratory classes will be identified, respectively new directions for the development of modular online education will be identified representing the only alternative of the onsite classic education in this situation.

Keywords

  • education
  • online modular courses
  • onesite couses
  • research
  • cooperation
  • questionnaire
Open Access

A Note on Generalized Solution of a Cauchy Problem Given by a Nonhomogeneous Linear Differential System

Published Online: 12 Dec 2020
Page range: 24 - 30

Abstract

Abstract

Generalized solution of a Cauchy problem given by a nonhomogeneous linear differential system is recovered to this approach. It considers the case of the free term having at most countable number of discontinuity points. The method, called successive approach, uses the solution on the previous interval (except the first one) for the condition on the given interval. The sequence of commands for a computer algebra system to this method is given.

Keywords

  • Cauchy problem
  • generalized solution
  • differential system
  • Laplace transform
  • computer algebra system
Open Access

A Survey on Devices Exploiting Lora Communication

Published Online: 12 Dec 2020
Page range: 31 - 35

Abstract

Abstract

Information and Communication Technologies (ICT) have experienced a large application in many fields, such as smart homes, health monitoring, environmental monitoring, and a great number of studies is present in literature. In particular, it is expected that the Internet of Things (IoT) will become increasingly pervasive in everyday life. Among different technologies, devices based on Long Range (LoRa) and LoRaWAN stand out due to their relative low cost, low power consumption and large cover range. In this survey, recent papers investigating applications of LoRa modules have been selected. The different use-cases are presented with a comparison between communication parameters and results obtained.

Keywords

  • LoRa
  • Network
  • Communication
  • Device
  • Monitoring
Open Access

The Integral Form of the Schur Inequality

Published Online: 12 Dec 2020
Page range: 36 - 40

Abstract

Abstract

The purpose of this paper is to show the integral form of the original Schur inequality and to give some applications.

Keywords

  • Schur’s inequality
  • Riemann integral
Open Access

Modeling in Water Resources Management in East Nile Delta: Review

Published Online: 12 Dec 2020
Page range: 41 - 46

Abstract

Abstract

It is acknowledged that providing a safe water supply for all countries is one of the major challenges of the twenty-first century. Egypt is one of the greatest countries affected in Africa and Middle East. The Nile is facing a major water shortage due to the limited water resources and the the demand is growing as a result high population growth and development in industrial and agricultural sectors. This paper has been motivated by the fact that there is no up-to-date literature review of the optimal operation of Water Resources. The analysis of the reviewed literature is structured along five broad branches: (1) Mathematical Optimization Modelling Studies, (2) Numerical Simulation Modelling Studies, (3) Geographical Information Systems “GIS” based Studies, (4) Ecological Studies, (5) Water Reuse Studies. This review is limited to surface water but groundwater has been inexplicitly included. The paper concludes the best way to identify knowledge to cover the gap between water supply and demands and to guide future researches on water resources planning and management.

Keywords

  • Optimization
  • Simulation
  • GIS
  • Ecological Studies
  • Water Reuse
Open Access

Legislation Review and Policy Recommendation for Work-Based Learning

Published Online: 12 Dec 2020
Page range: 47 - 53

Abstract

Abstract

The purpose of this paper is to review the legislation framework in the field of work-based learning (WBL), conducted in six European countries: Romania, Poland, Portugal, Germany, Bulgaria and Cyprus. The scope is to identify the policies and the legal framework set, or lack of such, in the field of WBL. A comparative analysis between formal regulations is done. Finally, policy recommendations for performing of evidence-based policy in the field of WBL are formulated: specific legislation for WBL, quality assurance of WBL programmes, incentives for employers participating in WBL programmes.

Keywords

  • work-based learning
  • legislation framework
  • Industry 4.0
  • quality assurance
Open Access

Methods in Complexity Analysis of Discrete Time Signals

Published Online: 12 Dec 2020
Page range: 54 - 56

Abstract

Abstract

Discrete time signals carry information about systems and their internal functional mechanisms which characterize their complexity. Complexity measures are strongly related to information content and evaluations have been made on various signals in many ways in last few years. This paper uses information theory estimates of complexity as different types of entropies in order to estimate the complexity of various time discrete synthesized signals. Results show that this kind of indices can be a useful tool in diagnostic, fault detection and further development.

Keywords

  • entropy
  • complexity
  • regularity
  • randomness
10 Articles
Open Access

Editorial: Second Volume of Acta Marisiensis. Seria Technologica

Published Online: 12 Dec 2020
Page range: 1 - 3

Abstract

Open Access

Effects of Sintering Temperature on Structural and Electrical Properties of Fe3+ Doping PZT Ceramics

Published Online: 12 Dec 2020
Page range: 4 - 7

Abstract

Abstract

The influence of the sintering temperature on the structure and on the hysteresis loops of Fe3+ doped Pb(ZrxTi1-x)O3 system has been investigated. Three compositions have been selected in the following mode: one in rhombohedral region, one in MPB region and one in tetragonal region have been obtained by solid state reaction technique. Sintering has been carried out at 12000C and 12500C respectively. The nature of the phases has been investigated in detail using X-ray diffraction analysis (XRD). All the sintered samples reveal a perovskite type structure. The surfaces have been lapped and metalized in order to obtaine the hysteresis loops at room temperature. The results showed a similar behaviour with “hard” PZT ceramics.

Keywords

  • doped PZT
  • hard PZT
  • dielectric properties
  • piezoelectric properties
Open Access

Buckling Analysis of Innovative Corrugated Column by using Response Surface Methodology

Published Online: 12 Dec 2020
Page range: 8 - 17

Abstract

Abstract

Tubular steel structures with slender compression cross-sections are prone to local buckling. In this paper the axial compression is investigation of the innovative fabricated structural steel column consisting of sinusoidal corrugated pattern. When it comes to the design of compressive individuals, buckling is a crucial layout provision. The paper describes the effect of variation in the sectional properties like mean diameter, thickness, amplitude, and frequency of corrugation on the buckling axial load. A quadratic model was developed to correlate the independent variables for maximum buckling load by using central composite design (CCD) method. Subsequently ANOVA, a statistical tool is used to analyse and compare the different combinations and finding the most influential factor on buckling load. Response surface methodology is adopted to review the interaction models between the different combinations.

Keywords

  • Innovative hollow column
  • Linear buckling analysis
  • ANSYS
  • Design of experiment
  • Response surface method
Open Access

Aspects Regarding the Online Modular Education System Compared with the Classical Onsite System

Published Online: 12 Dec 2020
Page range: 18 - 23

Abstract

Abstract

In according with the situation created by the pandemics of the world [4,6,7,8,9,10], the Covid-19 viruses were affected the all fields of activity from the all domains, like as: industrial domains, tourism, commercial, even of the educational system at all levels [1,2]. In this context our university, George Emil Palade University of Medicine, Pharmacy, Science and Technology of Targu Mures, it had to move from the classical educational system to approach of the new online modular system. This forced adaptation presents a lots of problems, especially of the all specializations within the Faculty of Engineering and Information Technology, where there are practical activities that involve laboratories with practical execution they cannot be performed by the online system. After an experience gained of almost 4 months of online activity, more several negative aspects are configured to be analyzed in order to find constructive solutions for optimizing the online educational system [1]. The present paper proposes to identification of a questionnaire addressed for the students as well as to the teachers from the Faculty of Engineering and Information Technology of UMFST “G.E.Palade” of Tg.Mures. Following the analysis of the all results of the questionnaire, the deficiencies of the problems raised by the technical disciplines that require phisicals practical applications in laboratory classes will be identified, respectively new directions for the development of modular online education will be identified representing the only alternative of the onsite classic education in this situation.

Keywords

  • education
  • online modular courses
  • onesite couses
  • research
  • cooperation
  • questionnaire
Open Access

A Note on Generalized Solution of a Cauchy Problem Given by a Nonhomogeneous Linear Differential System

Published Online: 12 Dec 2020
Page range: 24 - 30

Abstract

Abstract

Generalized solution of a Cauchy problem given by a nonhomogeneous linear differential system is recovered to this approach. It considers the case of the free term having at most countable number of discontinuity points. The method, called successive approach, uses the solution on the previous interval (except the first one) for the condition on the given interval. The sequence of commands for a computer algebra system to this method is given.

Keywords

  • Cauchy problem
  • generalized solution
  • differential system
  • Laplace transform
  • computer algebra system
Open Access

A Survey on Devices Exploiting Lora Communication

Published Online: 12 Dec 2020
Page range: 31 - 35

Abstract

Abstract

Information and Communication Technologies (ICT) have experienced a large application in many fields, such as smart homes, health monitoring, environmental monitoring, and a great number of studies is present in literature. In particular, it is expected that the Internet of Things (IoT) will become increasingly pervasive in everyday life. Among different technologies, devices based on Long Range (LoRa) and LoRaWAN stand out due to their relative low cost, low power consumption and large cover range. In this survey, recent papers investigating applications of LoRa modules have been selected. The different use-cases are presented with a comparison between communication parameters and results obtained.

Keywords

  • LoRa
  • Network
  • Communication
  • Device
  • Monitoring
Open Access

The Integral Form of the Schur Inequality

Published Online: 12 Dec 2020
Page range: 36 - 40

Abstract

Abstract

The purpose of this paper is to show the integral form of the original Schur inequality and to give some applications.

Keywords

  • Schur’s inequality
  • Riemann integral
Open Access

Modeling in Water Resources Management in East Nile Delta: Review

Published Online: 12 Dec 2020
Page range: 41 - 46

Abstract

Abstract

It is acknowledged that providing a safe water supply for all countries is one of the major challenges of the twenty-first century. Egypt is one of the greatest countries affected in Africa and Middle East. The Nile is facing a major water shortage due to the limited water resources and the the demand is growing as a result high population growth and development in industrial and agricultural sectors. This paper has been motivated by the fact that there is no up-to-date literature review of the optimal operation of Water Resources. The analysis of the reviewed literature is structured along five broad branches: (1) Mathematical Optimization Modelling Studies, (2) Numerical Simulation Modelling Studies, (3) Geographical Information Systems “GIS” based Studies, (4) Ecological Studies, (5) Water Reuse Studies. This review is limited to surface water but groundwater has been inexplicitly included. The paper concludes the best way to identify knowledge to cover the gap between water supply and demands and to guide future researches on water resources planning and management.

Keywords

  • Optimization
  • Simulation
  • GIS
  • Ecological Studies
  • Water Reuse
Open Access

Legislation Review and Policy Recommendation for Work-Based Learning

Published Online: 12 Dec 2020
Page range: 47 - 53

Abstract

Abstract

The purpose of this paper is to review the legislation framework in the field of work-based learning (WBL), conducted in six European countries: Romania, Poland, Portugal, Germany, Bulgaria and Cyprus. The scope is to identify the policies and the legal framework set, or lack of such, in the field of WBL. A comparative analysis between formal regulations is done. Finally, policy recommendations for performing of evidence-based policy in the field of WBL are formulated: specific legislation for WBL, quality assurance of WBL programmes, incentives for employers participating in WBL programmes.

Keywords

  • work-based learning
  • legislation framework
  • Industry 4.0
  • quality assurance
Open Access

Methods in Complexity Analysis of Discrete Time Signals

Published Online: 12 Dec 2020
Page range: 54 - 56

Abstract

Abstract

Discrete time signals carry information about systems and their internal functional mechanisms which characterize their complexity. Complexity measures are strongly related to information content and evaluations have been made on various signals in many ways in last few years. This paper uses information theory estimates of complexity as different types of entropies in order to estimate the complexity of various time discrete synthesized signals. Results show that this kind of indices can be a useful tool in diagnostic, fault detection and further development.

Keywords

  • entropy
  • complexity
  • regularity
  • randomness

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