scholarly journals Portable Photovoltaic-Self-Powered Flexible Electrochromic Windows for Adaptive Envelopes

2021 ◽  
Vol 2 (2) ◽  
pp. 174-185
Author(s):  
Antonio Cánovas-Saura ◽  
Ramón Ruiz ◽  
Rodolfo López-Vicente ◽  
José Abad ◽  
Antonio Urbina ◽  
...  
Keyword(s):  
Power Supply ◽  
Organic Solar Cells ◽  
Market Integration ◽  
Control Method ◽  
Light Transmission ◽  
Transmission Function ◽  
Electronic Control ◽  
Electrochromic Devices ◽  
Large Area ◽  
Self Powered

Variable transmission applications for light control or energy saving based on electrochromic materials have been successfully applied in the past in the building, sports, or automotive fields, although lower costs and ease of fabrication, installation, and maintenance are still needed for deeper market integration. In this study, all-printed large area (900 cm2 active area) flexible electrochromic devices were fabricated, and an autoregulating self-power supply was implemented through the use of organic solar cells. A new perspective was applied for automotive light transmission function, where portability and mechanical flexibility added new features for successful market implementation. Special emphasis was placed in applying solution-based scalable deposition techniques and commercially available materials (PEDOT-PSS as an electrochromic material; vanadium oxide, V2O5, as a transparent ion-storage counter electrode; and organic solar modules as the power supply). A straightforward electronic control method was designed and successfully implemented allowing for easy user control. We describe a step-by-step route following the design, materials optimization, electronic control simulation, in-solution fabrication, and scaling-up of fully functional self-powered portable electrochromic devices.

Some Advances in Energy Recycling Semiactive Vibration Suppression

2008 ◽  
Vol 56 ◽  
pp. 345-354 ◽  
Author(s):  
Junjiro Onoda
Keyword(s):  
Power Supply ◽  
Vibration Suppression ◽  
Control Method ◽  
Multiple Input Multiple Output ◽  
Piezoelectric Transducers ◽  
Vibrating Structures ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Self Powered ◽  
Shunt Circuit

This paper summarizes some studies performed by the author's group on energy-recycling semiactive vibration suppression using piezoelectric transducers embedded in the vibrating structures and shunted on switched inductive circuits. Basic idea of this method is to suppress the vibration by controlling the switch in the shunt circuit, which was first introduced by Richard C., et al. This idea has been upgraded by introducing (1) a multiple-input-multiple-output (MIMO) control method for the switches in the shunt circuits, (2) a self-sensing method to estimate the state of structure from the voltage across the piezoelectric transducer, so that any additional sensors can be neglected, and (3) a self-powered shunt circuit that performs the semiactive vibration suppression without any power supply. Several numerical and experimental results showed that the method works well against transient, sinusoidal, and random multi-modal vibrations and suppresses the vibrations effectively. It was also shown that the method is very robust, and, with it, the system is always stable. Studies for various applications of this method are also discussed.

Síntesis sencilla de óxido de tungsteno(VI) a partir del filamento de un foco

2011 ◽  
Vol 19 (4) ◽  
pp. 341
Author(s):  
Joel Díaz Reyes ◽  
Aarón Pérez-Benítez ◽  
Valentín Dorantes
Keyword(s):  
Infrared Spectroscopy ◽  
High Temperatures ◽  
Power Supply ◽  
Light Bulb ◽  
Electrochromic Devices ◽  
Tungsten Filament ◽  
Tungsten Oxides ◽  
Ac Power

<span>Tungsten(VI) oxide can be easily synthesized starting from a standard light bulb. The reaction consists in the oxidation at high temperatures (T ≈ 2000 – 3000° C) of a tungsten filament in presence of air; conditions which can be easily achieved by connecting a broken light bulb (but with its intact filament) to an AC-power supply of 110 volts. The vapor of WO3 is condensed into a beaker in a quantity enough to be characterized by infrared spectroscopy. The experiment is very funny, inexpensive and allows to the teacher to link several topics in current chemistry and physics of the tungsten oxides, such as their nomenclature and technological applications (i.e. electrochromic devices, gasochromic sensors, superalloys or as it is used in home: As a “simple” emisor of light!).</span>

scholarly journals Self-powered multifunctional sensing based on super-elastic fibers by soluble-core thermal drawing

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Mengxiao Chen ◽  
Zhe Wang ◽  
Qichong Zhang ◽  
Zhixun Wang ◽  
Wei Liu ◽  
...  
Keyword(s):  
Polymer Fibers ◽  
Elastic Fibers ◽  
Triboelectric Nanogenerator ◽  
Large Area ◽  
Manufacturing Method ◽  
Low Viscosity ◽  
Ion Movements ◽  
Self Powered ◽  
Thermal Drawing ◽  
Viscosity Polymer

AbstractThe well-developed preform-to-fiber thermal drawing technique owns the benefit to maintain the cross-section architecture and obtain an individual micro-scale strand of fiber with the extended length up to thousand meters. In this work, we propose and demonstrate a two-step soluble-core fabrication method by combining such an inherently scalable manufacturing method with simple post-draw processing to explore the low viscosity polymer fibers and the potential of soft fiber electronics. As a result, an ultra-stretchable conductive fiber is achieved, which maintains excellent conductivity even under 1900% strain or 1.5 kg load/impact freefalling from 0.8-m height. Moreover, by combining with triboelectric nanogenerator technique, this fiber acts as a self-powered self-adapting multi-dimensional sensor attached on sports gears to monitor sports performance while bearing sudden impacts. Next, owing to its remarkable waterproof and easy packaging properties, this fiber detector can sense different ion movements in various solutions, revealing the promising applications for large-area undersea detection.

Concept design of the control method for the NBI acceleration grid power supply-conversion system of CFETR

2021 ◽  
Vol 165 ◽  
pp. 112253
Author(s):  
Dongyu Wang ◽  
Shu Yang ◽  
Ming Zhang ◽  
Shaoxiang Ma ◽  
Kexun Yu ◽  
...  
Keyword(s):  
Power Supply ◽  
Control Method ◽  
Concept Design ◽  
Conversion System

scholarly journals Modulation of Lithium Disilicate Translucency through Heat Treatment

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2094
Author(s):  
Seok-Ki Jung ◽  
Dae Woon Kim ◽  
Jeongyol Lee ◽  
Selvaponpriya Ramasamy ◽  
Hyun Sik Kim ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Light Scattering ◽  
Flexural Strength ◽  
Control Method ◽  
Light Transmission ◽  
Lithium Disilicate ◽  
Lower Heat ◽  
Average Size ◽  
Ball Test

The aim of this study was to present a control method for modulating the translucency of lithium disilicate ceramics through thermal refinement. Identical lithium disilicate blocks were thermally refined using four different heat treatment schedules, and the microstructure, translucency, and flexural strength of the ceramics were investigated in detail by SEM, spectroscopy, and a piston-on-three-ball test. The results showed that ceramics treated under higher heat had larger grains, with an average size between 240 and 1080 nm. In addition, a higher transmittance of all wavelengths was observed in ceramics treated under lower heat, and the transmittance in the 550 nm wavelength ranged from 27 to 34%. The results suggest that the translucency of ceramics can be modified through thermal refinement under two conditions: (1) the particle size of the ceramic is small enough to achieve minimal grain-boundary light scattering, and (2) the percentage of particles allowing visible light transmission is altered by the heat treatment.

scholarly journals Research on Control Method of Microgrid Based on Multi Distributed Generation

2021 ◽  
Vol 2083 (2) ◽  
pp. 022099
Author(s):  
Chengyi Yue ◽  
Binbin Bei
Keyword(s):  
Distributed Generation ◽  
Control Strategy ◽  
Power Supply ◽  
Control Method ◽  
Peer To Peer ◽  
Strategy Method ◽  
Distributed Power ◽  
Simulink Simulation ◽  
Efficient Control ◽  
Peer Control

Abstract Reducing the dependence of microgrid upon the communication system and realizing the efficient control of multiple distributed generation of the microgrid are problems that need to be solved urgently. Through the research, based on multiple microgrid operation modes, the peer-to-peer control strategy in microgrid is investigated, and the peer-to-peer control strategy method of microgrid is given for a variety of complex control problems of distributed power According to the peer-to-peer control strategy method, distributed power supply adopts droop control in adjusting distributed power supply in output voltage and frequency; the droop controller has P-f and Q-U droop characteristics. This paper establishes a peer-to-peer control microgrid simulation model, adopts the droop controller designed in this paper to island mode and grid-connected mode, and investigates how the microgrid switches between the two modes. In accordance with Matlab/Simulink simulation outcomes, the research examines frequency, voltage and power changes in distributed generation in the microgrid, and verifies the validity and feasibility of microgrid peer-to-peer control strategy.

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