Sökning: "LED Light-emitting-diode"

Visar resultat 11 - 15 av 27 uppsatser innehållade orden LED Light-emitting-diode.

1. 11. Pre-study of optical LED units for shunting signals

   M1-uppsats, KTH/Hälsoinformatik och logistik

   Författare :Tobias Adolfsson; Axel Dellenby; [2021]
   Nyckelord :LED - Light Emitting Diode; Booster Converter; MLCC - Multi-layer capacitor; ESR - Equivalent Serie Resistance; OU - Optical Unit; Reactive compensation; LED - lysdiod; step-up omvandlare; MLCC - flerskiktskeramisk kondensator; ESR - ekvivalent serie motstånd; OU - optiskt enhet; reaktiv kompensering;

   Sammanfattning : Alstom wanted to investigate the possibility of adapting its light emitting diode (LED) technology for shunting signals in train traffic. The LED technology uses 50V, but Alstom wants to adapt it for 12V. The LED technology is energy efficient but needs to be adapted for existing signal interlocking by drawing a higher current. LÄS MER

3. 12. Lighting Evaluation and Design for the Stockholm Metro System Based on Current Models for Non-visual Responses

   Magister-uppsats, KTH/Ljusdesign

   Författare :Tong Liu; [2020]
   Nyckelord :Non-visual Effects; Circadian Lighting; Equivalent Melanopic Lux EML ; Circadian Stimulus CS ; Melanopic Equivalent Daylight Illuminance M-EDI ; Stockholm Metro System; Light-Emitting Diode LED ;

   Sammanfattning : Light has a wide and profound non-visual impact on the human body. It is related to the suppression or synthesis of a hormone called melatonin which regulates the human circadian clock. In Nordic countries like Sweden, lack of natural light in winter may lead to negative health effects such as circadian disorders or depression. LÄS MER

4. 13. Achieving Optimal Alignments of IR Source and Detector in Waveguide Based Gas Sensor

   Uppsats för yrkesexamina på grundnivå, KTH/Medicinteknik och hälsosystem

   Författare :Sefik Güler; Agbai Randolph Agwu; [2020]
   Nyckelord :Non-dispersive infrared technology; microelectromechanical systems; infrared light; electromagnetic spectrum; gas sensor; light emitting diode; photodiode detector; Icke-dispersiv infraröd teknologi; mikroelektromekaniska system; infrarött ljus; elektromagnetiskt spektrum; gassensor; lysdiod; fotodioddetektor;

   Sammanfattning : I takt med att tekniken för mikroelektromekaniska system utvecklas uppkommer det nya områden för tillämpning. Ett område är inom gassensorer där icke-dispersiv infraröd strålning används genom att mäta absorptionen hos olika gaser för att bestämma mängden av en specifik gas i luften. LÄS MER

5. 14. System Model of an Ultra-LowPower Fluorescence Detection Micro-Device

   Master-uppsats, Linköpings universitet/Elektroniska Kretsar och System

   Författare :Yuanyuan Xue; [2020]
   Nyckelord :;

   Sammanfattning : This thesis aims to explore the power consumption limits of Complementary Metal-Oxide-Semiconductor (CMOS) fluorescent biosensors that meet the demand, a Matlab-based calculator is designed, in which users can input required system parameters (such as LED power and noise) to observe the minimum power consumption of each basic component and the constraints of the transimpedance amplifier: cut-off frequency, signal- to-noise ratio, dynamic range, etc. Thereby to provide a reference range for the next level designs of each component in the detection system. LÄS MER

7. 15. How to improve the soilless cultivation of sweet basil looking at light and nutrition?

   Uppsats för yrkesexamina på avancerad nivå, SLU/Dept. of Crop Production Ecology

   Författare :Hedvig Säll; [2020]
   Nyckelord :hydroponics; aeroponics; sweet basil; essential oils; vertical farming;

   Sammanfattning : Sweet basil of the variety Genovese Gigante is an economically important crop with common use in the gastronomic, medical and cosmetic fields, to name a few, due to the high content of essential oils (EO). Indoor cultivation is a viable alternative to grow sweet basil all-year-round, independent of the outdoor conditions. LÄS MER