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Abstract

This article sheds light on the advent of online platforms and the way it is reshaping urban enviroment, breaking down traditional axes of both social interaction and commercial power, shifting the structure of traditional services. The platform revolution is radically transforming an array of many functional cities’ areas, like transportation, accommodations and personal services. Thus current concerns as strong urbanization, industrialization and world population growth, enable sharing economy firms to flourish as a reaction against the frictions of urban life exploiting such exacerbation, in order to fulfill demand for appropriate services. After a critical analysis of these issues, the article deepens innovative transportation services, moving on to illustrate the Italian rulemaking process as a chance to provide a solution to the ongoing problem of striking the right balance between competing priorities, such as market access and preservation of sustainable mobility. It suggests to reflect upon the best approach able to face the complexity of urban transport systems, in order to break in a new culture for urban mobility, comply to EU legislation too.

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Authors and Affiliations

Alessia Palladino
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Abstract

Drinking fresh water, turning the lights on, travelling by tram, calling our family, or getting a medical treatment are usual activities, but the underlying SCADA (Supervisory Control and Data Acquisition) systems like CIS (Critical Infrastructure Systems), ICS (Industrial Control Systems) or DCS (Distributed Control Systems) were always the target of many types of attacks, endangered the above mentioned simple activities. During the last decades because of the fast spread of the internet based services and the continuous technical development these systems become more vulnerable than ever. Full reconstruction and innovative changes in older SCADA systems has high cost, and it is not always rewarding. Communication protocols as Modbus (1979) serve as a main basis for SCADA systems, so security of Modbus has a major impact of the security of SCADA systems. Our paper raises and answers questions about the security of the Modbus RTU protocol. We focus on the serial Modbus protocol, because in that method we found many unsolved problems, like lack of authentication of the participants, lack of secure channel and so on. The aim of this paper to propose a secure communication alternative for Modbus RTU @ RS485 wire. The main advantage of the proposed method is the coexistence with traditional slaves and bus systems and only software update is necessary
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Authors and Affiliations

Éva Ádámkó
Gábor Jakabóczki
Szemes Péter Tamás
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Abstract

The objective of this paper is to estimate performance of a new approach for spectrum sharing and coordination between terrestrial base stations (BS) and On-board radio access nodes (UxNB) carried by Unmanned Aerial Vehicles (UAV). This approach employs an artificial intelligence (AI) based algorithm implemented in a centralized controller. According to the assessment based on the latest specifications of 3rd Generation Partnership Project (3GPP) the newly defined Unmanned Aerial System Traffic Management (UTM) is feasible to implement and utilize an algorithm for dynamic and efficient distribution of available radio resources between all radio nodes involved in process of optimization. An example of proprietary algorithm has been described, which is based on the principles of Kohonen neural networks. The algorithm has been used in simulation scenario to illustrate the performance of the novel approach of centralized radio channels allocation between terrestrial BSs and UxNBs deployed in 3GPP-defined rural macro (RMa) environment. Simulation results indicate that at least 85% of simulated downlink (DL) transmissions are gaining additional channel bandwidth if presented algorithm is used for spectrum distribution between terrestrial BSs and UxNBs instead of baseline soft frequency re-use (SFR) approach.
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Bibliography

[1] 3GPP, “UAS-UAV”, https://www.3gpp.org/uas-uav, accessed 18 November 2019.
[2] 3GPP TR 36.777, “Release 15. Enhanced LTE support for aerial vehicles”, January 2018.
[3] 3GPP TS 22.125, “Release 16. Unmanned Aerial System (UAS) support in 3GPP. Stage 1”, September 2019.
[4] 3GPP TS 22.125, “Release 17. Unmanned Aerial System (UAS) support in 3GPP. Stage 1”, December 2019.
[5] S. Zhang, Y. Zeng, R. Zhang, “Cellular-Enabled UAV Communication: A Connectivity-Constrained Trajectory Optimization Perspective”, IEEE Transactions on Communications, Vol. 67, No. 3, March 2019. DOI: 10.1109/TCOMM.2018.2880468.
[6] B. Li, Z. Fei, Y. Zhang, “UAV Communications for 5G and Beyond: Recent Advances and Future Trends”, IEEE Internet of Things Journal, Vol. 6, No. 2, April 2019. DOI: 10.1109/JIOT.2018.2887086.
[7] L. Sboui, H. Ghazzai, Z. Rezki, M.-S. Alouini, “Energy-Efficient Power Allocation for UAV Cognitive Radio Systems”, 2017 IEEE 86th Vehicular Technology Conference (VTC-Fall). DOI: 10.1109/VTCFall.2017.8287971.
[8] J. Huang, W. Mei, J. Xu, Q. Ling, Z. Rui, “Cognitive UAV Communication via Joint Maneuver and Power Control”, IEEE Transactions on Communications, Vol. 67, No. 11, November 2019. DOI: 10.1109/TCOMM.2019.2931322.
[9] G. Hattab, D. Cabric, “Energy-Efficient Massive IoT Shared Spectrum Access over UAV-enabled Cellular Networks”, Accepted for publication in IEEE Transactions on Communications, 2020. DOI: 10.1109/TCOMM.2020.2998547.
[10] C. Zhang, W. Zhang, “Spectrum Sharing for Drone Networks”, IEEE Journal on Selected Areas in Communications, Vol. 35, No. 1, January 2017. DOI: 10.1109/JSAC.2016.2633040.
[11] X. Ying, M.M. Buddhikot, S. Roy, “SAS-Assisted Coexistence-Aware Dynamic Channel Assignment in CBRS Band”, IEEE Transactions on Wireless Communications, Vol. 17, No. 9, September 2018. DOI: 10.1109/TWC.2018.2858261.
[12] T. Kohonen, “Self-Organizing Maps”, Series in Information Sciences, Vol. 30, Springer-Verlag Berlin Heidelberg, Third ed., 2001.
[13] K. Bechta, “Radio resource allocation”, International Application No.: PCT/FI2017/050149.
[14] Y. Yu, E. Dutkiewicz, X. Huang, M. Mueck, G. Fang, “Performance Analysis of Soft Frequency Reuse for Inter-cell Interference Coordination in LTE Networks”, 2010 10th International Symposium on Communications and Information Technologies. DOI: 10.1109/ISCIT.2010.5665044.
[15] 3GPP TS 38.901, “Release 16. Study on channel model for frequencies from 0.5 to 100 GHz”, January 2020.

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Authors and Affiliations

Kamil Bechta
1

  1. Mobile Networks Business Division of Nokia
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Abstract

The essay critically approaches the current state and directions of changes in the university education. We see the critical point in the unconditioned endorsement by the university of the market values of intense competitiveness of global economy and the cult of the pro-market education which is its inevitable result. We would like to argue that although the university must respect economic conditions and limitations, nevertheless we fear that the ongoing process of corporatization of the university with its management strategies such as cutting costs, scanning environments for competitive purposes, re-engineering highly competitive efficiency criteria for the staff will bring about a neglect of the humanist values rooted in intellectual and social sensibility and hence undermine the social mission of the university which, apart from professional skills and research, must cultivate intellectual pluralism by providing space for intelligent conversation, sharing critical views of the present state of things thus fostering social criticism and the spirit of responsible dissent.

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Authors and Affiliations

Tadeusz Sławek
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Abstract

The study of changes in grassland was conducted on the territory of individual counties of the West Pomeranian Voivodship. Based on data collected in the Valorisation of the Agricultural Production Space of Poland and spatial data (an electronic 1:5000 soil and agricultural map) the basic information on the use of agricultural land in the 70s of the 20th century. Changes in use over time were analysed based on data the Statistics Poland (Pol.: Główny Urząd Statystyczny – GUS), General Geographic Database and The Agency for Restructuring and Modernisation of Agriculture Crop Register (Pol.: Agencja Restrukturyzacji i Modernizacji Rolnictwa – ARiMR).
The studies showed that in the West Pomeranian Voivodship, a successive decrease in the share of permanent grasslands (0.9%) and arable lands (1.4%) is observed. There is a spatial variation in the share of permanent grassland in the province’s counties, with a distinction between northern and southern counties. The main direction of change in grassland area is arable land, which applies to counties with the highest share of permanent grassland (PG) and counties with a high share of the best soils and forest direction. Land quality was the main factor determining the direction of grassland changes, with the best PG converted to arable land or for investment purposes. In contrast, the weakest were converted to forestry or spontaneously wooded through abandonment. The main reasons for changes in grassland areas in the West Pomeranian Voivodship were: conversion of use to arable land, afforestation of grasslands, land use for urban planning purposes, leaving land fallow and conversion for constructing fishponds.
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Authors and Affiliations

Teodor Kitczak
1
ORCID: ORCID
Marek Podlasiński
1
ORCID: ORCID
Grzegorz Jarnuszewski
1
ORCID: ORCID
Ryszard Malinowski
1
ORCID: ORCID

  1. West Pomeranian University of Technology, Faculty of Environmental Management and Agriculture, Department of Environmental Management, 17 Słowackiego St, 71-434, Szczecin, Poland
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Abstract

Circular economy – a new approach in the understanding of the human–environment relationship. The work presented the assumptions of the circular economy as a new concept of the economy functioning with the method of production “from cradle to cradle” constituting the opposition to the commonly used linear economy approach (take, make, dispose). Work discussed also the impact on the quality of human life and the management of environmental resources. Functional assumptions of the circular economy and its territorial dimension were presented, especially in urban areas where the green economy and sharing economy mechanisms are used. The potential for economic growth and the creation of new jobs was also emphasized due to the implementation of circular economy in the EU countries.
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Authors and Affiliations

Marek Degórski
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Abstract

Present study examines nonfinancial support granted for older people in Poland and other European countries in order to understand the relationships between family structures and that support and to diagnose the challenges that the Polish population may face in this respect in the nearest future. The analysis is based on the data from the Survey on Health, Aging and Retirement in Europe (SHARE). The study attempts also to answer the question about the need for informal support in future generations of older Poles. The study is focused on the population of individuals aged at least 50+, because they will decide about the situation of older people in the near future. The author considers, in addition to personal care, help in running a household and help with paper work. The most frequently received type of support is the help in running a household, received primarily from neighbors and family members, which reduces the need for institutional care. Personal care is provided to the minority of the examined population, even in the highest age group, and, apart from household members, it concerns usually biological children.

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Authors and Affiliations

Anna Nicińska
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Abstract

The paper deals with the issue of financial efficiency, measured by the arithmetic rate of return, of indirect financial investments in the area of strategic raw materials (hard coal, copper, crude oil). Two forms of indirect investments were analyzed: shares of natural resources companies listed on the Warsaw Stock Exchange and futures contracts for strategic commodities: hard coal, copper and crude oil.

The time of the analysis is the first 6 months of 2019 and 2020. The year 2019 was regarded as an analysis of the period of economic growth, and the year 2020 was the analysis of the period of economic crisis. The comparisons were made in two dimensions. Firstly, it whether indirect commodity investments show the characteristics of efficiency resilience to the time of the economic crisis was checked (by comparing the achieved rates of return in the two analyzed periods). Secondly, which of the analyzed forms of investment (stocks, contracts) gives better investment results during economic growth and economic crisis was compared.

As it was shown in the paper, indirect commodity investments do not show an above-average rate of return neither during economic growth nor economic crisis. The achieved rates of return on shares compared to changes in the WIG20 index in the analyzed first half of 2019 were negative. Only one company showed a positive and significantly higher than the market rate of return. Very similar results were achieved by the analyzed companies in 2020.

On the other hand, the analysis of prices and rates of return on commodity futures contracts showed that in the period of economic growth it is effective to take a long position on crude oil contracts and a short position on hard coal contracts. In a period of economic crisis, the opposite position is profitable due to the observed growth in hard coal prices and a significant drop in crude oil prices.

The answers to the research questions posed in the paper do not provide indications for recommending indirect forms of investment in commodities as an alternative to analogous forms of other sectors of the economy. The analysis shows that the impact of the economic situation on the efficiency of commodity investment is most noticeable for crude oil, and the least (among the analyzed commodities) for indirect copper-based investments.

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Authors and Affiliations

Krystian Pera
ORCID: ORCID
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Abstract

A three-level multi-input DC/DC converter is proposed to solve the problems of complex interface circuit structure and high economic cost for multi-source access to the joint power supply distribution system. In this structure, multiple dc sources are integrated into a three-level DC/DC converter. In comparison with the two-stage counterpart, two active switches and boost diodes are eliminated, while two blocking diodes are added to block the reverse current from the dc-link capacitors. In addition, when the input inductors work in the discontinuous conduction mode, power sharing among different input sources can be achieved by properly selecting the inductance value. The working principle of the converter is analyzed by introducing nine working modes in detail and deriving the steady-state relationship expressions. The parameter range of the element is determined and the design process of a group of dynamic parameter values is shown. Finally, the power electronics real-time simulation platform is built based on StarSim HIL and the corresponding experimental waveforms are given to verify the topology and analysis.
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Authors and Affiliations

Jingjing Tian
1
Jiaoping Qu
1
ORCID: ORCID
Feng Zhao
1
Xiaoqiang Chen
1 2
Ying Wang
1 2
ORCID: ORCID
Yang Gan
1

  1. School of Automation & Electrical Engineering, Lanzhou Jiaotong University, Lanzhou, China
  2. Key Laboratory of Opto-technology and Intelligent Control, Lanzhou Jiaotong University, Ministry of Education, Lanzhou, China
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Abstract

Hybrid pixel radiation detectors with a direct photon-to-charge conversion working in a single photon counting mode have gained increasing attention due to their high dynamic range and noiseless imaging. Since sensors of different materials can be attached to readout electronics, they enable work with a wide range of photon energies. The charge-sharing effect observed in segmented devices, such as hybrid pixel detectors, is a phenomenon that deteriorates both spatial resolution and detection efficiency. Algorithms that allow the detection of a photon irrespective of the charge-sharing effect are proposed to overcome these limitations. However, the spatial resolution of the detector can be further improved beyond the resolution determined by the pixel size if information about the charge proportions collected by neighbouring pixels is used to approximate the interaction position. In the article, an approach to achieve a subpixel resolution in a hybrid pixel detector working in the single photon counting mode is described. Requirements and limitations of digital inter-pixel algorithms which can be implemented on-chip are studied. In the simulations, the factors influencing the detector resolution are evaluated, including size of a charge cloud, number of virtual pixel subdivisions, and detector parameters.
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Bibliography

  1. Ballabriga, et al. Review of hybrid pixel detector readout ASICs for spectroscopic X-ray imaging. J. Instrum. 11, P01007–P01007 (2016). https://doi.org/10.1088/1748-0221/11/01/P01007
  2. Taguchi, K. & Iwanczyk, J. S. Vision 20/20: Single photon counting X-ray detectors in medical imaging. Med. Phys. 40, 100901 (2013). https://doi.org/10.1118/1.4820371
  3. Bahadur, D. et al. Evolution of structure and dynamics of thermo-reversible nanoparticle gels-A combined XPCS and rheology study. J. Chem. Phys. 151, 10 (2019). https://doi.org/10.1063/1.5111521
  4. Sheyfer, et al.Nanoscale critical phenomena in a complex fluid studied by X-ray photon correlation spectroscopy.Phys. Rev. Lett. 125, 125504 (2020). https://doi.org/10.1103/PhysRevLett.125.125504
  5. Szczygiel, R., Grybos, P., Maj, P. & Zoladz, M. PXD18k - Fast Single Photon Counting Chip with Energy Window for Hybrid Pixel Detector. in 2011 IEEE Nuclear Science Symposium Conference Record. 932–937 (IEEE, Valencia, Spain 2011). https://doi.org/10.1109/NSSMIC.2011.6154126
  6. Nilsson, H. E., Dubari, E., Hjelm, M. & Bertilsson, K. Simulation of photon and charge transport in x-ray imaging semiconductor sensors. Nucl. Instrum. Methods Phys. Res. A. 487, 151–162 (2002). https://doi.org/10.1016/S0168- 9002(02)00959-2
  7. Ballabriga, R. et al. The Medipix3RX: a high resolution, zero dead-time pixel detector readout chip allowing spectroscopic imaging. Instrum. 8, C02016–C02016 (2013). https://doi.org/10.1088/1748-0221/8/02/C02016
  8. Krzyzanowska, A. et al. Characterization of the photon counting CHASE Jr., chip built in a 40-nm CMOS process with a charge-sharing correction algorithm using a collimated X-ray beam. IEEE Trans. Nucl. Sci. 64, 2561–2568 (2017). https://doi.org/10.1109/TNS.2017.2734821
  9. Bellazzini, R. et al. PIXIE III: a very large area photon-counting CMOS pixel ASIC for sharp X-ray spectral imaging. J. Instrum. 10, C01032–C01032 (2015). https://doi.org/10.1088/1748-0221/10/01/C01032
  10. Otfinowski, P. et al. Comparison of allocation algorithms for unambiguous registration of hits in presence of charge- sharing in pixel detectors. J. Instrum. 12, C01027–C01027 (2017). http://doi.org/10.1088/1748-0221/12/01/C01027
  11. Otfinowski, P., Deptuch, G. W. & Maj, P. Asynchronous approximation of a center of gravity for pixel detectors’ readout circuits. IEEE Solid-State Circuits 53, 1550–1558 (2018). https://doi.org/10.1109/JSSC.2018.2793530
  12. Cartier, et al. Micron resolution of MÖNCH and GOTTHARD, small pitch charge integrating detectors with single photon sensitivity. J. Instrum. 9, C05027–C05027 (2014). https://doi.org/10.1088/1748-0221/9/05/C05027
  13. Dreier, E. S. et al. Virtual subpixel approach for single-mask phase-contrast imaging using Timepix3. J. Instrum. 14, C01011 (2019). https://doi.org/10.1088/1748-0221/14/01/C01011
  14. Maj, P. et al. Measurements of ultra-fast single photon counting chip with energy window and 75 μm pixel pitch with Si and CdTe J. Instrum. 12, C03064 (2017). https://doi.org/10.1088/1748-0221/12/03/C03064
  15. Krzyzanowska, A., Niedzielska, A. & Szczygieł, R. Charge-sharing simulations for new digital algorithms achieving subpixel resolution in hybrid pixel detectors. J. Instrum. 15, C02047 (2020). https://doi.org/10.1088/1748- 0221/15/02/C02047
  16. Lutz, Semiconductor Radiation Detectors, Device Physics. (Berlin, Heidelberg: Springer Berlin Heidelberg, 2007).
  17. NIST XCOM: Photon Cross Sections Database – Introduction. NIST http://www.physics.nist.gov/PhysRefData/Xcom/Text/intro.html (2017).
  18. Otfinowski, A. et al. Pattern recognition algorithm for charge-sharing compensation in single photon counting pixel detectors. J. Instrum. 14, C01017 (2019). https://doi.org/10.1088/1748-0221/14/01/C01017
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Authors and Affiliations

Aleksandra Krzyżanowska
1
ORCID: ORCID
Robert Szczygieł
1
ORCID: ORCID

  1. AGH University of Science and Technology, 30 A. Mickiewicza Ave., 30-059 Krakow, Poland
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Abstract

The paper suggests an improved method of active power distribution among the gas-diesel generators operating in parallel; the method involves the control of torque and the angular positions of their rotors. The use of the suggested approach to the solution of the active power distribution task in the presence of instability of drive motor speed provides the increase of autonomous power system operation efficacy and rising the power unit’s performance. The authors analyzed the causes of generation of low-frequency fluctuations of generator drive engine speed; in autonomous electric power systems, gas diesel generators are increasingly used as such generator drive engines. It is suggested to use the developed method and structure of the optical device for control of rotation period and the measurement of the generator rotor angle position characterized with high accuracy, as the sensor. The authors developed a schematic diagram of active power distribution among the generators operating in parallel, which uses the cross feedback for gas-powered diesel engine shafts momentum and the generator rotor angle position. They obtained experimental results confirming the efficiency of the suggested active power distribution method and its practical implementation.
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Bibliography

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[2] J.M. Prousalidis, G.J. Tsekouras, F. Kanellos. (2011). New challenges emerged from the development of more efficient electric energy generation units. In Proc. IEEE Electric Ship Technologies Symposium (ESTS). Alexandria, Virginia, 374–381. https://doi.org/10.1109/ESTS.2011.5770901
[3] A. Boretti, (2019). Advantages and Disadvantages of Diesel Single and Dual-Fuel Engines. Frontiers in Mechanical Engineering, 5 (64), 1–15. https://doi.org/10.3389/fmech.2019.00064
[4] V.M. Ryabenkij, A.O. Ushkarenko, V.I. Voskoboenko, (2008). Issledovanie avtokolebatelnykh proczessov chastoty napryazheniya gazodizel-generatorov. Sbornik nauchnykh trudov NUK, 4, 113–118.
[5] G. Evangelos, Giakoumis. (2016). Review of Some Methods for Improving Transient Response in Automotive Diesel Engines through Various Turbocharging Configurations. Frontiers in Mechanical Engineering, 2, 1–18. https://doi.org/10.3389/fmech.2016.00004
[6] V.M. Ryabenkij, A.O. Ushkarenko, V.I. Voskoboenko, (2009). Oczenka neravnomernosti raspredeleniya aktivnoj moshhnosti mezhdu generatorami pri parallelnoj rabote. Tekhnichna elektrodinamika, Tem. Vipusk, 3, 76–79.
[7] Adem, Celika, Mehmet, Yilmazb, & Omer Faruk, Yildizc. (2020). Improvement of diesel engine startability under low temperatures by vortex tubes. Energy Reports, 6, 17–27. https://doi.org/10.1016/j.egyr.2019.11.027
[8] Ra, Youngchul, Reitz, Rolf, Mcfarlane, Joanna, & Daw, Stuart. (2008). Effects of Fuel Physical Properties on Diesel Engine Combustion Using Diesel and BioDiesel Fuels. SAE International Journal of Fuels and Lubricants, 1, 703–718. https://doi.org/10.4271/2008-01-1379
[9] Yasin, Karagoz, Tarkan, Sandalci, Umit O, Koylu, Ahmet Selim, Dalkilic, & Somchai, Wongwises. (2016). Effect of the use of natural gas-diesel fuel mixture on performance, emissions, and combustion characteristics of a compression ignition engine. Advances in Mechanical Engineering, 8 (4), 1–13. https://doi.org/10.1177/1687814016643228
[10] Yoshihiko, Oishi, Riky Stepanus, Situmorang, Rio Arinedo, Sembiring, Hideki, Kawai, & Himsar, Ambarita. (2019). Performance, rate of heat release, and combustion stability of dual fuel mode in a small diesel engine. Energy Science and Engineering, 7, 1333–1351. https://doi.org/10.1002/ese3.352
[11] Irfan, Muhammad, Ermanu, A.H., Suhardi, Diding, Kasan, N., Effendy, Machmud, Pakaya, Ilham, & Faruq, Amrul. (2018). A design of electrical permanent magnet generator for rural area wind power plant. International Journal of Power Electronics and Drive Systems, 9, 269–275. https://doi.org/10.11591/ijpeds.v9n1.pp269-275
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Authors and Affiliations

Abdullah M. Eial Awwad
1
Mahmoud M. S. Al-Suod
1
Alaa M. Al-Quteimat
1
O.O. Ushkarenko
2
Atia AlHawamleh
1

  1. Department of Electrical Power Engineering and Mechatronics, Tafila Technical University, Tafila, Jordan
  2. Department of Electrical and Electronics Engineering, Admiral Makarov National University of Shipbuilding, Mykolaiv, Ukraine
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Abstract

The paper presents a review of concepts for the development of city centres in response to social and culture processes, economic, technical and environmental developments taking place at present on those areas. This review proves that concepts tend to change over time from those based on economic dynamics to those based on collaborative commons and on governance. On the example of a few city centres situated in the Silesian Region an analysis was carried out of the concepts being presently applied and with the use of which projects Silesian cities strive to maintain and strengthen the dynamics and vitality of city centres.

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Authors and Affiliations

Adam Polko

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