A5011102317- Transition Metal Oxide Nanomaterials
- Glass properties and applications
- Electrical and Thermal Properties of Materials
- Catalysis and Oxidation Reactions
- Pigment Synthesis and Properties
- Gas Sensing Nanomaterials and Sensors
- Electric Power Systems and Control
- Microwave Dielectric Ceramics Synthesis
- Advanced MEMS and NEMS Technologies
- Conducting polymers and applications
- Industrial Engineering and Technologies
- Material Properties and Applications
- Economic and Technological Innovation
- Material Science and Thermodynamics
- Economic and Business Development Strategies
- Advanced Energy Technologies and Civil Engineering Innovations
- Environmental and Industrial Safety
- Ergonomics and Human Factors
- Diverse Industrial Engineering Technologies
- Agriculture Market Analysis Ukraine
- ZnO doping and properties
- Extremum Seeking Control Systems
- Business and Economic Development
- Polymer Science and PVC
- Advanced Memory and Neural Computing
Oles Honchar Dnipro National University
2005-2023
The changes in electric current during the switching of vanadium dioxide-based glass-ceramic samples from off-state to on-state and vice versa were studied this paper. delay transition when a voltage U0 is applied sample related time tdon required heat it metal-semiconductor phase temperature VO2. decreases with increasing U0. It was found that reverse controlled by cord within which VO2 crystallites glass-ceramics are metal phase. t doff determines exists after switched off. value tdoff...
A relevant scientific-practical issue related to the sustainable development of outer space is selection optimal parameters solar panels for uninterrupted supply energy in power plants spacecraft. It has been determined that advancing energy-efficient technologies a prerequisite ensuring stable activities. The decision-making process regarding choice alternative options electrothermal protection spacecraft occurs under conditions uncertainty and various risks. methodical approach assessing...
An actual scientific and practical task related to the sustainable development of country’s energy sector is forecast parameters predict conditions operation solar cells batteries in regular non-regular situations. It emphasized that this makes it possible provide with high efficiency indicators, particular, indicator profitability on invested capital construction panels. The main specific research method regression analysis – build a model total amount generated panels ground installations...
The metal-semiconductor phase transition (MSPT) in vanadium dioxide is accompanied by an abrupt change a number of physical parameters this compound, particular the resistivity. Of great interest are glass-ceramic materials, which synthesized on basis and glass V2O5 — P2O5 system. Electronic devices based such materials can operate at high electric currents. This allows you to create elements known as threshold switches critical thermistors. paper presents results study electrical...
Представлено результати експериментальних досліджень впливу особливостей параметрів електричного кола сонячного модуля на функціонування його пасивного фотоелемента з паралельно підключеним байпасним критичним терморезистором як методу підвищення надійності роботи модуля. Як терморезистор використовували склокерамічні матеріали основі діоксиду ванадію та ванадій-фосфатного скла V2O5-P2O5, що стрибкоподібно змінюють величину опору 1,5−2 порядки в області температури 70 0С. Основну увагу...
Polymer composites with active fillers are recently considered to be promising materials for the design of new functional devices controllable properties and intensively investigated. Dielectric studies one most effective methods studying structural features mechanisms conductivity formation this type two-component systems. The paper presents research results dielectric characteristics in range radio frequency 50 kHz — 10 MHz temperature 30—60°C polyethylene vanadium dioxide different volume...
The overheating caused by electrical loads is one of the essential factors impairing reliability photovoltaic components solar cells. most common technical solution to this problem use such additional elements as bypass diodes. However, practice installing diodes in parallel with a chain cells has shown that approach does not eliminate hot spots completely, and thus characteristics deteriorate at faster pace. One possible solutions critical thermistors based on metal-semiconductor phase...
The overheating caused by electrical loads is one of the essential factors impairing reliability photovoltaic components solar cells. most common technical solution to this problem use such additional elements as bypass diodes. However, practice installing diodes in parallel with a chain cells has shown that approach does not eliminate hot spots completely, and thus characteristics deteriorate at faster pace. One possible solutions critical thermistors based on metal-semiconductor phase...
The work presents the results of study electrical conductivity direct current samples a polymer composite polypropylene-vanadium dioxide with volume fraction VO2 from 0.1 to 0.7. It is shown that composites has percolation character. transition in range 0.3-0.35 volumetric particles vanadium dioxide. volt-current characteristics content more than 0.35 have an S-shaped shape. In temperature dependence resistance composites, jump-like decrease was found region phase semiconductor-metal VO2....
Electrophysical properties of near-surface layer ZnO varistor ceramics forming during high-temperature annealing in oxidizing gaseous atmosphere are studied. Microstructure and its electrical have features which determined by an increased concentration oxygen at surface pressed ceramic billets comparison with bulk annealing. From the data electron raster microscopy cross-chipping varistors, it is defined that average value thickness 40 μm. It found specific resistivity 5.3·1012 Ω·cm. The...