scholarly journals Design, Development, and Analysis of a Densely Packed 500x Concentrating Photovoltaic Cell Assembly on Insulated Metal Substrate

2015 ◽  
Vol 2015 ◽  
pp. 1-18 ◽  
Author(s):  
Leonardo Micheli ◽  
Nabin Sarmah ◽  
K. S. Reddy ◽  
Xichun Luo ◽  
Tapas K. Mallick
Keyword(s):  
Light Emitting Diode ◽  
Schottky Diodes ◽  
Photovoltaic Cell ◽  
Metal Substrate ◽  
The Novel ◽  
Design Development ◽  
Light Emitting ◽  
Cost Cutting ◽  
In Series ◽  
Photovoltaic Technologies

The paper presents a novel densely packed assembly for high concentrating photovoltaic applications, designed to fit 125x primary and 4x secondary reflective optics. This assembly can accommodate 144 multijunction cells and is one of the most populated modules presented so far. Based on the thermal simulation results, an aluminum-based insulated metal substrate has been used as baseplate; this technology is commonly exploited for Light Emitting Diode applications, due to its optimal thermal management. The original outline of the conductive copper layer has been developed to minimize Joule losses by reducing the number of interconnections among the cells in series. Oversized Schottky diodes have been employed for bypassing purposes. The whole design fits the IPC-2221 requirements. The plate has been manufactured using standard electronic processes and then characterized through an indoor test and the results are here presented and commented on. The assembly achieves a fill factor above 80% and an efficiency of 29.4% at 500x, less than 2% lower than that of a single cell commercial receiver. The novel design of the conductive pattern is conceived to decrease the power losses and the deployment of an insulated metal substrate represents an improvement towards the awaited cost-cutting for high concentrating photovoltaic technologies.

A Pathway for Information Transmission to the Ear

1995 ◽  
Vol 74 (9) ◽  
pp. 640-644 ◽  
Author(s):  
Ricardo Ferreira Bento ◽  
Aroldo Miniti ◽  
Tanit Ganz Sanchez ◽  
Adolfo Leiner ◽  
Carlos Augusto Nunes
Keyword(s):  
Tympanic Membrane ◽  
Hearing Aids ◽  
Electromagnetic Interference ◽  
Light Emitting Diode ◽  
Photovoltaic Cell ◽  
Small Power ◽  
Prosthetic Devices ◽  
Light Emitting ◽  
Implantable Hearing Aids ◽  
Audio Range

The use of implantable hearing aids and cochlear implants as an aid to neurosensory deafness is becoming an established procedure. The transmission of a processed speech signal is accomplished either transcutaneously via radiofrequency or percutaneously by connector coupling. Whereas the former is sensitive to electromagnetic interference, the latter increases the risk of infection. To overcome these disadvantages, an infrared (IR) system for transmission through the tympanic membrane was devised and tested. The transmitter/receiver consisted of an IR light emitting diode (LED;920nm) and a photovoltaic cell. The LED was placed inside the auditory canal of four dogs and the photovoltaic cell in the tympanic cavity over the cochlear promontory. A sinusoidal signal modulation was applied to the LED. The emitted signal was detected undistorted after crossing the tympanic membrane, with an average absorbance of 20%. High-frequency cut-off was adequate for cochlear implant purposes and audio prosthetic devices in general. The authors conclude that the tympanic membrane may be used as a translucent sealed interface to transmit data in the audio range to the middle and inner ears, with small power loss, good frequency response, and immunity to interface.

C@KCu7S4 microstructure for solid-state supercapacitors

RSC Advances ◽  
2014 ◽  
Vol 4 (76) ◽  
pp. 40542-40545 ◽  
Author(s):  
Shuge Dai ◽  
Yi Xi ◽  
Chenguo Hu ◽  
Baoshan Hu ◽  
Xule Yue ◽  
...  
Keyword(s):  
Solid State ◽  
Energy Density ◽  
Specific Capacitance ◽  
Light Emitting Diode ◽  
Maximum Power Density ◽  
Capacity Retention ◽  
Light Emitting ◽  
Hybrid Supercapacitors ◽  
Scan Rate ◽  
In Series

Three C/KCu7S4 hybrid supercapacitors units in series can light one light-emitting diode for 3.5 min; the hybrid supercapacitors can deliver the largest specific capacitance of 352 F g−1 at the scan rate of 10 mV s−1, the maximum power density of 994.8 kW kg−1, the highest energy density of 26.2 W h kg−1 and cycling stability (86% capacity retention after 2000 cycles).

Near-Field Electroluminescent Refrigeration System Consisting of Two Graphene Schottky Diodes

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Jaeman Song ◽  
Junho Jang ◽  
Mikyung Lim ◽  
Jungchul Lee ◽  
Seung S. Lee ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Near Field ◽  
Schottky Diodes ◽  
Electrical Power ◽  
Coefficient Of Performance ◽  
Semiconductor Diode ◽  
Design Parameters ◽  
Refrigeration System ◽  
Surface Polaritons ◽  
Light Emitting

Abstract It has been shown that the performance of a thermal radiative device, such as a thermophotovoltaic (TPV) and an electroluminescent (EL) refrigerator, can be significantly enhanced when the vacuum gap between a reservoir and a semiconductor diode becomes nanoscale. Recently, several studies have reported the integration of a TPV and a light emitting diode (LED) in one near-field thermal radiative device to improve the operation efficiency. However, surface polaritons were hardly exploited in previous research because bare semiconductor diodes were used. In this paper, we propose a TPV-LED integrated near-field EL refrigeration system consisting of two graphene-semiconductor Schottky diodes. A substantial refrigeration rate (101.9 kW/m2) is achieved owing to the coupling of surface plasmon-phonon polaritons excited by a symmetric configuration of graphene-polar materials. Moreover, the cooling coefficient of performance (COP) of the system can be enhanced up to 2.65 times by recycling the electrical power generated in the TPV cell. The cooling performance is further investigated in relation to design parameters, namely the doping concentration of Si and insulator thickness.

The novel design of a remote phosphor ceramic plate for white light generation in high power LEDs

2015 ◽  
Vol 3 (24) ◽  
pp. 6148-6152 ◽  
Author(s):  
Young Hyun Song ◽  
Gill Sang Han ◽  
Eun Kyung Ji ◽  
Min-Ji Lee ◽  
Ye Lim Song ◽  
...  
Keyword(s):  
White Light ◽  
High Power ◽  
Light Emitting Diode ◽  
Ceramic Plate ◽  
The Novel ◽  
Light Emitting ◽  
White Light Generation ◽  
Remote Phosphor ◽  
Light Generation ◽  
Novel Design

Here, we report a phosphor ceramic plate (PCP) constructed using Y3Al5O12:Ce3+ (YAG:Ce) nanoparticles (NPs) with a uniform spherical size distribution for high-power light emitting diode (LED) applications.

scholarly journals High-performance near-field electroluminescent refrigeration device consisting of a GaAs light emitting diode and a Si photovoltaic cell

2017 ◽  
Vol 122 (14) ◽  
pp. 143104 ◽  
Author(s):  
Kaifeng Chen ◽  
Tianyao P. Xiao ◽  
Parthiban Santhanam ◽  
Eli Yablonovitch ◽  
Shanhui Fan
Keyword(s):  
High Performance ◽  
Light Emitting Diode ◽  
Near Field ◽  
Photovoltaic Cell ◽  
Light Emitting

scholarly journals Auditory-induced visual illusions in rodents measured by spontaneous behavioural response

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yuki Ito ◽  
Ryo Sato ◽  
Yuta Tamai ◽  
Shizuko Hiryu ◽  
Tomoko Uekita ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Behavioural Response ◽  
Novel Object Recognition ◽  
Multimodal Integration ◽  
Time Varying ◽  
The Novel ◽  
Light Emitting ◽  
Single Flash ◽  
Multisensory Information ◽  
First Time

AbstractWhen two brief sounds are presented with a short flash of light, we often perceive that the flash blinks twice. This phenomenon, called the “sound-induced flash illusion”, has been investigated as an example of how humans finely integrate multisensory information, more specifically, the temporal content of perception. However, it is unclear whether nonhuman animals experience the illusion. Therefore, we investigated whether the Mongolian gerbil, a rodent with relatively good eyesight, experiences this illusion. The novel object recognition (NOR) paradigm was used to evaluate the gerbil’s natural (i.e., untrained) capacity for multimodal integration. A light-emitting diode embedded within an object presented time-varying visual stimuli (different flashing patterns). The animals were first familiarised with repetitive single flashes. Then, various sound stimuli were introduced during test trials. An increase in exploration suggested that the animals perceived a flashing pattern differently only when the contradicting sound (double beeps) was presented simultaneously with a single flash. This result shows that the gerbil may experience the sound-induced flash illusion and indicates for the first time that rodents may have the capacity to integrate temporal content of perception in a sophisticated manner as do humans.

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