scholarly journals A Rat Model of Thrombosis in Common Carotid Artery Induced by Implantable Wireless Light-Emitting Diode Device

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Jih-Chao Yeh ◽  
Kuo-Lun Huang ◽  
Yung-Chin Hsiao ◽  
Yu-Han Hsu ◽  
Yun-Han Lin ◽  
...  
Keyword(s):  
Carotid Artery ◽  
Common Carotid Artery ◽  
Thrombus Formation ◽  
Light Emitting Diode ◽  
Electrical Power ◽  
Light Emitting ◽  
Acute Occlusion ◽  
Power Intensity ◽  
Novel Approach ◽  
Arterial Endothelium

This work has developed a novel approach to form common carotid artery (CCA) thrombus in rats with a wireless implantable light-emitting diode (LED) device. The device mainly consists of an external controller and an internal LED assembly. The controller was responsible for wirelessly transmitting electrical power. The internal LED assembly served as an implant to receive the power and irradiate light on CCA. The thrombus formation was identified with animal sonography, 7T magnetic resonance imaging, and histopathologic examination. The present study showed that a LED assembly implanted on the outer surface of CCA could induce acute occlusion with single irradiation with 6 mW/cm2LED for 4 h. If intermittent irradiation with 4.3–4.5 mW/cm2LED for 2 h was shut off for 30 min, then irradiation for another 2 h was applied; the thrombus was observed to grow gradually and was totally occluded at 7 days. Compared with the contralateral CCA without LED irradiation, the arterial endothelium in the LED-irradiated artery was discontinued. Our study has shown that, by adjusting the duration of irradiation and the power intensity of LED, it is possible to produce acute occlusion and progressive thrombosis, which can be used as an animal model for antithrombotic drug development.

Research note: Light emitting diodes as solar power resources

2018 ◽  
Vol 51 (3) ◽  
pp. 476-483
Author(s):  
RK Salman
Keyword(s):  
Environmental Pollution ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Electronic Devices ◽  
Electrical Power ◽  
Lemon Yellow ◽  
Angle Of Incidence ◽  
Solar Panels ◽  
Light Emitting ◽  
Power Resources

This paper investigates the possibility of recycling light emitting diodes from damaged electronic devices, and using them in a similar way to photovoltaic cells in order to reduce environmental pollution. The study used a number of tests with a variety of different parameters for measuring the capability for light emitting diodes to harvest the sun’s rays and to convert them into a useful form of electrical power. The different configurations involved variations of light emitting diode wavelength and number, as well as the connection types between the light emitting diodes (series and parallel) and the angle of incidence of the sun’s rays to the light emitting diode’s base. The results showed promising voltage data for parallel-connected light emitting diodes of lemon (yellow-green) and green colour. The variations in voltage produced by tilting the light emitting diode’s base exhibited similar behaviour to that seen in solar panels. The power that was harvested from the light emitting diodes was extremely low, but the voltage gains showed promising trends that could be employed in useful applications. Hence, light emitting diodes could be re-used to reduce environmental pollution and thus to contribute towards environmental enhancement.

Amoled Tft Pixel Circuitry for Flexible Displays on Metal Foils

2003 ◽  
Vol 769 ◽  
Author(s):  
Matias Troccoli ◽  
Themis Afentakis ◽  
Miltiadis K. Hatalis ◽  
Apostolos T. Voutsas ◽  
Masahiro Adachi ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Steel Substrate ◽  
Metal Foil ◽  
Flexible Displays ◽  
Active Matrix ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Metal Foils ◽  
Organic Light ◽  
Novel Approach

AbstractActive matrix organic light emitting diode displays based on thin, flexible metal foil substrates offer a novel approach to fabricate light, flexible and rugged displays. Metal foils allows devices to be fabricated at higher process temperatures yielding better device characteristics than plastic substrates. Furthermore, the conductive nature of such substrates enables more efficient use of pixel area through the use of a global power electrode. We are implementing Active Matrix Organic Light Emitting Diode (AMOLED) displays on flexible stainless steel substrate using 2 TFT and 4 TFT pixel circuit topologies with two different layout realizations that exploit the conductive properties of the substrate.

An Intelligent Personas System for Determining LED Lighting Design Requirements

2011 ◽  
Vol 145 ◽  
pp. 43-47
Author(s):  
Kevin C. Tseng ◽  
Chi Wei Chung
Keyword(s):  
Light Emitting Diode ◽  
Lighting Design ◽  
Development Stage ◽  
Design Team ◽  
Light Emitting ◽  
System A ◽  
Novel Approach ◽  
Design Requirements ◽  
Market Trends ◽  
Effective Design

The intent of this paper is to illustrate a personas system effective design to aid development of new products. This system would help a design team find and understand the lifestyle of target customers by using personas method in early concept development stage. In order to quickly realize market trends, easily collect customer requirements and readily integrate user opinions, the proposed system is capable of helping experts in different domains concurrently share their ideas in real time and discuss with each other without geographic limitation. In addition, a novel approach is proposed, named as ‘Personas Matrix’, to quantify the requirements which can accelerate the assessment of true needs. Finally, in order to validate the proposed system, a LED (Light-Emitting Diode) project was applied to test the functionality of the approach and the usefulness of the system thus helping the design team refine requirements, simplify requirement gathering, and prompt the assessment.

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.

scholarly journals Inactivation of Escherichia Coli and Salmonella Using 365 and 395 nm High Intensity Pulsed Light Emitting Diodes

Foods ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 679 ◽  
Author(s):  
Amritha Prasad ◽  
Michael Gänzle ◽  
M. S. Roopesh
Keyword(s):  
Escherichia Coli ◽  
Foodborne Pathogens ◽  
High Intensity ◽  
Light Exposure ◽  
Light Emitting Diode ◽  
Antibacterial Efficacy ◽  
Pulsed Light ◽  
Light Emitting ◽  
E Coli ◽  
Novel Approach

High intensity pulsed light emitting diode (LED) treatment is a novel approach to inactivate foodborne pathogens. The objective of this study was to evaluate the antibacterial potential of high intensity 365 (UV-A) and 395 nm (NUV-Vis) LED treatments against Escherichia coli and Salmonella enterica at high and low water activity (aw) conditions, and to understand the influence of different process parameters on their antibacterial efficacy. Bacteria at high (in phosphate buffer saline, PBS) and low aw (aw = 0.75) conditions were treated with both the LEDs with specific doses at a fixed distance from the LEDs. The 365 nm LED showed more effectiveness in reducing the dried bacteria compared to 395 nm LED. The dry E. coli showed more resistance to LED treatments compared to Salmonella. The 365 and 395 nm LED treatments with ~658 J/cm2 dose resulted in reductions of 0.79 and 1.76 log CFU/g of Salmonella, respectively, on 0.75 aw pet foods. The LED treatments increased the surface temperature, resulting in water loss in the treated samples. This study showed that the dose, duration of light exposure, bacterial strain, and aw played a major role in the antibacterial efficacy of the 365 and 395 nm LEDs.

scholarly journals Visible Light Communication Survey

2019 ◽  
pp. 22-31
Author(s):  
Eszter Udvary
Keyword(s):  
Visible Light ◽  
Light Emitting Diode ◽  
Rapid Evolution ◽  
Data Communication ◽  
Communication Technologies ◽  
Visible Light Communication ◽  
Light Emitting ◽  
Main Research ◽  
Novel Approach ◽  
Increasing Demand

Communication applying visible light technology is a novel approach. Visible Light Communication (VLC) development is motivated by the increasing demand for wireless communication technologies. It has the potential to provide highspeed data communication with good security and improved energy efficiency. The rapid evolution of VLC was sustained by the LEDs performances. The Light-Emitting-Diode (LED) luminaires are capable of switching to the different light intensity at a fast rate. This function can be used for data transmission. This article focuses on the physical layer of the VLC links. It reviews the technology, the topology of the proposed connection, and the benefits of this approach. The main research trends are identified emphasizing state of the art in this area. It shows how VLC technology evolved and what are the performances achieved at this time. Various structures of the transmitter and receiver are studied, and different modulation schemes are investigated. Finally, numerous applications of VLC technology are presented.

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