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oe1(光电查) - 科学论文

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出版时间
  • 2019
  • 2018
  • 2016
研究主题
  • rural electrification
  • optimised renewable energy utilisation
  • power sharing
  • micro grid
  • community development
  • grid interconnection
  • Battery energy storage systems
  • techno-economic modeling
  • photovoltaics
  • net-metering
应用领域
  • Electrical Engineering and Automation
  • New Energy Science and Engineering
  • Optoelectronic Information Science and Engineering
机构单位
  • Amrita School of Engineering
  • State Grid Sichuan Electric Power Research Institute
  • Aristotle University of Thessaloniki
  • The University of Texas at Austin
  • Northern (Arctic) Federal University named after M.V. Lomonosov
  • Univ. Grenoble Alpes, Grenoble INP
  • Dracula Technologies
  • Majmaah University
  • Ritsumeikan University
  • KNIT
2365 条数据
?? 中文（中国） ▾

  • Piezophotonics: From fundamentals and materials to applications

    摘要： The piezophotonic effect is the coupling between piezoelectric properties and photoexcitation, where strain-induced piezopotential modulates and controls the relevant optical process. Specifically, metal ions as activators are capable of responding to photoexcitation and subsequent emission of light, also called mechanoluminescence, in general, and piezoluminescence specifically for piezoelectrics. These phenomena are helpful for understanding the materials fundamentals and conceiving widespread device applications. In this article, we briefly introduce the physical mechanisms of piezophotonics, including piezoluminescence. Selected host materials and metal-ion activators are described for demonstrating the piezophotonic effect. We provide a unified profile and recent prototypical demonstrations of light emission triggered by mechanical stimuli. The devices based on these materials offer the advantages of remote detection, nondestructive analysis, and repeatability, hence they are promising candidates for applications in stress sensing, structural health diagnosis, three-dimensional handwriting, magnetic-optical sensing, energy harvesting, biomedicine, novel light sources, and displays.

    关键词： energy harvesting,piezoluminescence,mechanoluminescence,piezophotonics,stress sensing

    更新于2025-09-04 15:30:14

  • Influence of Post-deposition Heat Treatments on the Optical Properties of Chemically Deposited Nanocrystalline TiO2 Thin Films

    摘要： The aim of this study is to investigate the potentials of TiO2 thin films for device applications. Nanocrystalline single phase of rutile TiO2 thin films have been prepared by Chemical Bath Deposition (CBD) technique at bath temperature range from 75-80°C, keeping other deposition variables constant. The films were then subjected to post-deposition heat treatments with annealing temperatures in the range 373 to 673 K. The optical characterisation was done using the Elmer Lambda-2 spectrometer to investigate the transmittance and absorbance versus wavelength measurements. The data obtained from the transmittance and absorbance measurements were used to deduce the important optical constants. The results show that the energy bandgap was direct, with values in the range ≤1.8 eV for the as-deposited layers and ≥2.2 eV for the annealed layers. At lower temperatures, the band gaps of the annealed samples did not differ significantly from the energy gap (1.8 eV) of the as-deposited film. At higher thermal treatment, the energy gaps increased with the increase in annealing temperatures and a maximum of 2.2 eV for the energy gap was determined for TiO2 film annealed at 673 K. The values of the energy bandgap obtained in study, are within the range suitable for application in photovoltaic solar cell devices and in related photonic applications.

    关键词： thermal annealing,Energy band gap,solar cells,TiO2

    更新于2025-09-04 15:30:14

  • [IEEE 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Nara, Japan (2018.10.9-2018.10.12)] 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - An Electromagnetic Energy Harvester for Extracting Rotational Energy

    摘要： A micro-generator for harvesting rotational energy is proposed. By integrating conducting coils with rotational mechanism and magnets, the generator can induce electrical power through electromagnetic conversion. The output performances of the proposed generator under various rotational speeds are studied and demonstrated. The generator is expected to supply sufficient power for micro sensors, compared with typical micro-generators.

    关键词： energy harvesting,rotational

    更新于2025-09-04 15:30:14

  • [IEEE 2018 International Conference and Exposition on Electrical And Power Engineering (EPE) - Iasi, Romania (2018.10.18-2018.10.19)] 2018 International Conference and Exposition on Electrical And Power Engineering (EPE) - Establishing an Optimal Residential RES PV Source by Modelling

    摘要： The analyzed Microgrid (MG) is implemented in the Research Centre of Transilvania University of Brasov Institute and consists in an 8 kW photovoltaic (PV) system, a grid connecting PV inverter of 4.6 kW and a 48V Li-ion stationary battery interfaced with the MG by a 6 kW inverter which provides around 20 kWh storage capacity. The main issue of this paper is to establishing by modeling, an optimal residential PV renewable energy source (RES), that provide for a given inverter the best energy production based on the solar potential from Brasov area. Simulations are accomplished in Homer Pro software in order to estimate the optimal PV power source to obtain a maximum amount of energy for a given PV system structure.

    关键词： modelling,microgrid,PV source,renewable energy sources

    更新于2025-09-04 15:30:14

  • [IEEE 2018 2nd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT) - Ankara, Turkey (2018.10.19-2018.10.21)] 2018 2nd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT) - Optimal Design of a Rooftop Wind-PV Hybrid System to Meet Energy Demand for a Typical Residential Home in 20-Year Lifetime Projection

    摘要： The need for electrical power gradually increases every year due to population growth and economic development in particular in developing countries. The primary sources of electricity are usually fossil fuels such as coal, natural gas, oil etc. and major part of them is imported by those countries. This is unfortunately a typical indication of the energy dependence and play strategic role in economic development of the developing countries since some cannot switch to renewable energy use despite they have abundant renewable energy potential. The fact that the use of renewable energy is not widespread in those countries and it can be seen as not making enough investment by the government or private sector. This potential can be utilized by using on-grid/off-grid renewable systems in particular wind-PV systems ranging from power ratings of 1 to 10 kW in remote areas. To make such systems economic, power balance between generation and consumption should be maintained at hourly time slots in the day. One way to do that is to solve a discrete optimization problem and the solution can be achieved by a mathematical model satisfying the given constraints in a certain location. Unit sizing of a low power off-grid renewable system to meet power demand for a typical residential home in a location is achieved and the outcomes are meaningful and encouraging for widening renewable energy applications worldwide.

    关键词： electric generation,metaheuristic techniques,optimal design,rooftop wind-PV hybrid system,renewable energy

    更新于2025-09-04 15:30:14

  • [IEEE 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) - Singapore, Singapore (2018.4.22-2018.4.26)] 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) - Enhancement in Energy Harvesting Performances of Piezoelectric Nanogenerator by Sandwiching Electrostatic rGO Layer Between PVDF-BTO Layers

    摘要： Herein the fabrication and characterizations of self-poled, tri-layer piezoelectric nanogenerators (PENGs) have been investigated. The tri-layer structure was obtained by sandwiching surface modified n-type reduced graphene oxide (n-rGO) layer between poly(vinylidene fluoride)-barium titanate (PVDF-BTO) sheets. The highly charged n-rGO layer facilitates in improving the crystallinity of PVDF by attracting and aligning the dipoles from lower and upper PVDF-BTO sheets without any external electric field. The enhancement in electro-active beta (β) phase of PVDF was also confirmed through X-ray diffraction pattern. For the comparison analysis three different, single layer (PVDF-BTO), bi-layer (n-rGO/PVDF-BTO), and tri-layer (PVDF-BTO/n-rGO/PVDF-BTO) NGs were prepared. Among them, tri-layer NG reveals maximum open circuit voltage of 10 Vpk-pk. Furthermore, it exhibits short circuit current of 2.5 μApk-pk at an applied force of 2N. Finally, the mechanical stability of fabricated NG was also tested under several pressing and releasing cycles. It was estimated that our fabricated PENG can be a promising building block for powering flexible small electronics.

    关键词： energy harvesting,n-rGO,PVDF-BTO,piezoelectric nanogenerators,flexible electronics

    更新于2025-09-04 15:30:14

  • Integrating Grey Data Preprocessor and Deep Belief Network for Day-ahead PV Power Output Forecast

    摘要： Generation output forecasting is a crucial task for planning and sizing of a photovoltaic (PV) power plant. The purpose of this paper is to present an effective model for day-ahead forecasting PV power output of a plant based on deep belief network (DBN) combined with grey theory-based data preprocessor (GT-DBN), where the DBN attempts to learn high-level abstractions in historical PV output data by utilizing hierarchical architectures. Test results obtained by the proposed model are compared with those obtained by other five forecasting methods including autoregressive integrated moving average model (ARIMA), back propagation neural network (BPNN), radial basis function neural network (RBFNN), support vector regression (SVR), and DBN alone. It shows that the proposed model is superior to other models in forecasting accuracy and is suitable for day-ahead PV power output prediction.

    关键词： supervised learning,time series analysis,power generation planning,neural networks,Renewable energy

    更新于2025-09-04 15:30:14

  • Discrete Dimers of Redox-Active and Fluorescent Perylene Diimide-Based Rigid Isosceles Triangles in the Solid State

    摘要： The development of rigid covalent chiroptical organic materials, with multiple, readily available redox states, which exhibit high photoluminescence is of particular importance in relation to both organic electronics and photonics. The chemically stable, thermally robust and redox-active perylene diimide (PDI) fluorophores have received ever-increasing attention owing to their excellent fluorescence quantum yields in solution. Planar PDI derivatives, however, generally suffer from aggregation-caused emission quenching in the solid state. Herein, we report on the design and synthesis of two chiral isosceles triangles wherein one PDI fluorophore and two pyromellitic diimide (PMDI) or naphthalene diimide (NDI) units are arranged in a rigid cyclic triangular geometry. The optical, electronic and magnetic properties of the rigid isosceles triangles are fully characterized by a combination of optical spectroscopies, X-ray diffraction, cyclic voltammetry, and computational modeling techniques. Single-crystal X-ray diffraction analysis shows that both isosceles triangles form discrete, nearly cofacial PDI-PDI π-dimers in the solid state. While the triangles exhibit fluorescence quantum yields of almost unity in solution, the dimers in the solid state exhibit very weak — yet at least an order of magnitude higher — excimer fluorescence yield in comparison with the almost completely quenched fluorescence of a reference PDI. The triangle containing both NDI and PDI subunits shows superior intramolecular energy transfer from the lowest excited singlet state of the NDI to that of the PDI subunit. Cyclic voltammetry suggests that both isosceles triangles exhibit multiple, easily accessible and reversible redox states. Applications beckon in arenas related to molecular optoelectronic devices.

    关键词： intramolecular energy transfer,isosceles triangles,rigid covalent chiroptical organic materials,naphthalene diimide,excimer fluorescence,redox-active,π-dimers,photoluminescence,perylene diimide,pyromellitic diimide,cyclic voltammetry

    更新于2025-09-04 15:30:14

  • Catalytic deracemization of chiral allenes by sensitized excitation with visible light

    摘要： Chiral compounds exist as enantiomers that are non-superimposable mirror images of each other. Owing to the importance of enantiomerically pure chiral compounds—for example, as active pharmaceutical ingredients—separation of racemates (1:1 mixtures of enantiomers) is extensively performed. Frequently, however, only a single enantiomeric form of a chiral compound is required, which raises the question of how a racemate can be selectively converted into a single enantiomer. Such a deracemization process is entropically disfavoured and cannot be performed by a conventional catalyst in solution. Here we show that it is possible to photochemically deracemize chiral compounds with high enantioselectivity using irradiation with visible light (wavelength of 420 nanometres) in the presence of catalytic quantities (2.5 mole per cent) of a chiral sensitizer. We converted an array of 17 chiral racemic allenes into the respective single enantiomers with 89 to 97 per cent enantiomeric excess. The sensitizer is postulated to operate by triplet energy transfer to the allene, with different energy-transfer efficiencies for the two enantiomers. It thus serves as a unidirectional catalyst that converts one enantiomer but not the other, and the decrease in entropy is compensated by light energy. Photochemical deracemization enables the direct formation of enantiopure materials from a racemic mixture of the same compound, providing a novel approach to the challenge of creating asymmetry.

    关键词： chiral sensitizer,triplet energy transfer,deracemization,chiral compounds,visible light,enantiomers,photochemical

    更新于2025-09-04 15:30:14

  • AIP Conference Proceedings [Author(s) INTERNATIONAL CONFERENCE ON SUSTAINABLE ENGINEERING AND TECHNOLOGY (ICONSET 2018) - Karnataka, India (19–20 April 2018)] - Design and development of solar panel tracking mechanism

    摘要： The solar power is quickly gaining significance since an energy reserve as fossil oil costs vary. With ordinary fixed solar panel we can’t get maximum utilization of sun radiation that is why we are using a single axis solar tracking system which will continuously track the sun radiation, so that the angle of incident of solar radiation with the solar panel should always perpendicular to get maximum efficiency of solar incident radiation. The daylight dependent resistors carry out the work of sensing the vary in the location of the sun, that is dealing with the particular modify in the solar plate location by switching on and off the motor. The direct circuit does the work of supply the input from the sensor also gives demand towards the motor to run during order to attempt the modify in the sun’s position. It has been found that the solar tracking system can gather about 17.72% extra power than fixed panel structure and thus more effectiveness are achieved through this mechanism.

    关键词： energy,mechanism,renewable,tracking,solar panel

    更新于2025-09-04 15:30:14