1 December 05, 2025
Articles
1. Artem D. Mulyndin, Vladimir Yu. Mironov, Alisa A. Milenkaya, Sofya A. Shikhova, Rinat V. Fayzullin
The Evolution of the Content of the Smart City Concept
European Journal of Renewable Energy. 2025. 10(1): 3-7.
Number of views: 13 Download in PDF
European Journal of Renewable Energy. 2025. 10(1): 3-7.
Abstract:
The article traces the historical evolution of the Smart City concept from its initial technocratic understanding based on technological determinism to a modern holistic model focused on systemic sustainability and data-driven governance. Based on the analysis of scientific publications and practical cases, including the experience of implementing the Urban Environment Quality Index (ICGS) in Russia, the key phases of this transformation are identified. It is proved that the modern concept of a “Smart City” is a synthesis of technological tools, strategic planning data and socially oriented management, where technology serves not as an end in itself, but as a tool for achieving long-term sustainability and adaptability of the urban environment.
The article traces the historical evolution of the Smart City concept from its initial technocratic understanding based on technological determinism to a modern holistic model focused on systemic sustainability and data-driven governance. Based on the analysis of scientific publications and practical cases, including the experience of implementing the Urban Environment Quality Index (ICGS) in Russia, the key phases of this transformation are identified. It is proved that the modern concept of a “Smart City” is a synthesis of technological tools, strategic planning data and socially oriented management, where technology serves not as an end in itself, but as a tool for achieving long-term sustainability and adaptability of the urban environment.
Number of views: 13 Download in PDF
Letters to the Editorial Office
2. Oleg V. Gradov
The Problem of Energy-Based Classification of Mini-, Micro- and Nanorotators Based on Su-Field Analysis Criteria: From Controlling Physical Fields to Non-Conservative Self-Organization Principles
European Journal of Renewable Energy. 2025. 10(1): 8-24.
Number of views: 14 Download in PDF
3. Oleg V. GradovEuropean Journal of Renewable Energy. 2025. 10(1): 8-24.
Abstract:
This article addresses the problem of energy-based classification of rotational elements such as propellers, rotors, or gyroscopes within the global trend of technical systems miniaturization. Many microminiaturization principles used in MEMS design can be related to Su-Field Analysis, which explicitly utilizes substance-field interaction principles widely applied in system engineering. The classification of microrotators based on controlling physical fields is presented according to Su-Field (“vepol”) Analysis criteria. 1. Optical control methods, including laser activation and light harvesting, involving complex mechanisms beyond classical theories/models (thermal, convective, and plasmonic effects emerge when metallic nanoparticles are heated by light, leading to chaotic dynamics). 2. Acoustic control methods (including based on cavitation bubbles). 3. Magnetically controlled systems for biomedical applications and swarm robotics (classical Altshuller’s “fepol”). 4. Chemical control and actuation methods encompass catalytic micro- and nanopropellers and enzyme-catalyzed rotor systems. Finally, challenges associated with manufacturing processes for nanorotational devices (due to self-organization mechanisms in active heterogeneous media) are highlighted. Classical 3D fabrication techniques applicable to industrial-scale propellers become senseless for nanostructures. This necessitates reconsideration of design and testing methodologies (particularly considering size-dependent effects and modified similarity criteria).
This article addresses the problem of energy-based classification of rotational elements such as propellers, rotors, or gyroscopes within the global trend of technical systems miniaturization. Many microminiaturization principles used in MEMS design can be related to Su-Field Analysis, which explicitly utilizes substance-field interaction principles widely applied in system engineering. The classification of microrotators based on controlling physical fields is presented according to Su-Field (“vepol”) Analysis criteria. 1. Optical control methods, including laser activation and light harvesting, involving complex mechanisms beyond classical theories/models (thermal, convective, and plasmonic effects emerge when metallic nanoparticles are heated by light, leading to chaotic dynamics). 2. Acoustic control methods (including based on cavitation bubbles). 3. Magnetically controlled systems for biomedical applications and swarm robotics (classical Altshuller’s “fepol”). 4. Chemical control and actuation methods encompass catalytic micro- and nanopropellers and enzyme-catalyzed rotor systems. Finally, challenges associated with manufacturing processes for nanorotational devices (due to self-organization mechanisms in active heterogeneous media) are highlighted. Classical 3D fabrication techniques applicable to industrial-scale propellers become senseless for nanostructures. This necessitates reconsideration of design and testing methodologies (particularly considering size-dependent effects and modified similarity criteria).
Number of views: 14 Download in PDF
Problems of Energy Supply for Active Implants: Actuators, Energy Harvesting Systems and Sensors based on Reversible Energy Conversion Principles. 1. From Piezoelectric Polymer Materials to Implantable Thread-Based Acousto-Electrofluidics
European Journal of Renewable Energy. 2025. 10(1): 25-58.
Number of views: 11 Download in PDF
4. European Journal of Renewable Energy. 2025. 10(1): 25-58.
Abstract:
The article discusses the problem of power supply for excitable active polymer implants in regenerative medicine. It emphasizes the necessity to transition from traditional electronic schemes with external power sources towards systems mimicking biological structures. The focus is on piezoelectric materials like polyvinylidene fluoride (PVDF), which are biocompatible and capable of generating electricity and mechanical stimulation signals. This approach could lead to more efficient implantable devices that integrate seamlessly into living tissues. Future developments will likely involve exploring new methods for fabricating energy harvesting nanostructured biomaterials for active implants with multiparametric excitability features. By combining different types of fillers (such as metals or metal oxides) with PVDF, researchers aim to achieve multiparametric stimulation strategies where multiple stimuli (electromagnetic waves, temperature changes, etc.) converge onto single transducers. Incorporating novel energy conversion modalities beyond simple electromechanical feedback loops (for energy harvesting) in active polymer implants may help refine (physio)therapeutic interventions. Efforts have focused on designing composite scaffolds containing nanoparticles that enhance specific functionalities, including magnetic-electrical activation capabilities (PVDF-based multiferroics). For instance, iron oxide nanoparticles (Fe₃O₄) embedded in PVDF matrices show promise for stimulating neural cells by leveraging magnetoelectric coupling effects. Applications of PVDF-based technologies span across various domains within regenerative medicine. They range from bone healing applications supported by piezoresponse-mediated signals to cardiac muscle repair via electrically active PVDF fibers. All of them can be specifically "energized" by different ways of energy harvesting and activation of excitable biological tissues. By integrating acoustic wave manipulation principles alongside electrical signaling pathways, it becomes feasible to develop ultracompact implantable platforms capable to be activable by different pathways and energy conversion principles.
The article discusses the problem of power supply for excitable active polymer implants in regenerative medicine. It emphasizes the necessity to transition from traditional electronic schemes with external power sources towards systems mimicking biological structures. The focus is on piezoelectric materials like polyvinylidene fluoride (PVDF), which are biocompatible and capable of generating electricity and mechanical stimulation signals. This approach could lead to more efficient implantable devices that integrate seamlessly into living tissues. Future developments will likely involve exploring new methods for fabricating energy harvesting nanostructured biomaterials for active implants with multiparametric excitability features. By combining different types of fillers (such as metals or metal oxides) with PVDF, researchers aim to achieve multiparametric stimulation strategies where multiple stimuli (electromagnetic waves, temperature changes, etc.) converge onto single transducers. Incorporating novel energy conversion modalities beyond simple electromechanical feedback loops (for energy harvesting) in active polymer implants may help refine (physio)therapeutic interventions. Efforts have focused on designing composite scaffolds containing nanoparticles that enhance specific functionalities, including magnetic-electrical activation capabilities (PVDF-based multiferroics). For instance, iron oxide nanoparticles (Fe₃O₄) embedded in PVDF matrices show promise for stimulating neural cells by leveraging magnetoelectric coupling effects. Applications of PVDF-based technologies span across various domains within regenerative medicine. They range from bone healing applications supported by piezoresponse-mediated signals to cardiac muscle repair via electrically active PVDF fibers. All of them can be specifically "energized" by different ways of energy harvesting and activation of excitable biological tissues. By integrating acoustic wave manipulation principles alongside electrical signaling pathways, it becomes feasible to develop ultracompact implantable platforms capable to be activable by different pathways and energy conversion principles.
Number of views: 11 Download in PDF