Results 11 to 20 of about 12,603,366 (384)
LED Receiver Impedance and Its Effects on LED-LED Visible Light Communications [PDF]
2018 IEEE International Conference on Communications Workshops (ICC Workshops), 2018 This paper experimentally demonstrates that the AC impedance spectrum of the LED as a photodetector heavily depends on the received optical power, which may cause the impedance mismatch between the LED and the post trans-impedance amplifier. The optical power dependent impedance of the LED is well fitted by a modified dispersive carrier transport model
Shangbin Li, Boyang Huang, Zhengyuan Xu
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Design of an Oximeter Based on LED-LED Configuration and FPGA Technology [PDF]
Sensors, 2013 A fully digital photoplethysmographic (PPG) sensor and actuator has been developed. The sensing circuit uses one Light Emitting Diode (LED) for emitting light into human tissue and one LED for detecting the reflectance light from human tissue. A Field Programmable Gate Array (FPGA) is used to control the LEDs and determine the PPG and Blood Oxygen ...
Dejan Karadaglic, Radovan Stojanovic
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Frontiers in Rehabilitation Sciences, 2023 Long COVID disproportionately affects premenopausal women, but relatively few studies have examined Long COVID's impact on female reproductive health. We conduct a review of the literature documenting the female reproductive health impacts of Long COVID ...
Beth Pollack +7 more
doaj +1 more source
LED–LED portable oxygen gas sensor [PDF]
Analytical and Bioanalytical Chemistry, 2012 A portable instrument for oxygen determination, based on the quenching of phosphorescent octaethylporphyrin by gaseous O(2), has been developed using the fluorimetric paired emitter-detector diode technique (FPEDD). The instrument configuration consists of two light-emitting diodes (LEDs) facing each other, with an interchangeable support containing a ...
Perez de Vargas-Sansalvador, Isabel M. +5 more
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Clinical Case Reports, 2021 PBMT using 630 + 660 nm wavelengths transcutaneously at 7 cm above chest area irradiating lungs and heart regions of patients with acute, infectious respiratory syndrome alleviated their respiratory symptoms, mitigated pulmonary inflammation and hypoxia.
Michèle Pelletier‐Aouizerate +1 more
doaj +1 more source
LED-to-LED wireless communication between divers [PDF]
ACTA IMEKO, 2021 <p class="Abstract">For military divers, having a robust, secure, and undetectable wireless communication system available is a fundamental element. Wireless intercoms using acoustic waves are currently used. These systems, even if reliable, have the defect of being easily identifiable and detectable.
Fabio Leccese +1 more
openaire +2 more sources
The merger that led to the formation of the Milky Way’s inner stellar halo and thick disk [PDF]
Nature, 2018 The assembly of our Galaxy can be reconstructed using the motions and chemistry of individual stars1,2. Chemo-dynamical studies of the stellar halo near the Sun have indicated the presence of multiple components3, such as streams4 and clumps5, as well as
A. Helmi +5 more
semanticscholar +1 more source
Mini-LED, Micro-LED and OLED displays: present status and future perspectives
Light: Science & Applications, 2020 Presently, liquid crystal displays (LCDs) and organic light-emitting diode (OLED) displays are two dominant flat panel display technologies. Recently, inorganic mini-LEDs (mLEDs) and micro-LEDs (μLEDs) have emerged by significantly enhancing the dynamic ...
Yuge Huang +3 more
semanticscholar +2 more sources
Scientific Reports, 2023 Herein, we integrated angle-scanning surface plasmon resonance (SPR) and angle-fixed SPR as a hybrid angular-interrogation SPR to enhance the sensing performance.
Hidenori Koresawa +8 more
doaj +1 more source
Angular Color Uniformity Enhancement for Color-Mixed LEDs by Introducing a Diffusing Coating Layer
IEEE Photonics Journal, 2020 In this study, a simple and low-cost method is proposed to enhance angular color uniformity (ACU) of color-mixed light-emitting diodes (cm-LEDs) by introducing a diffuse coating layer.
Xin Zhu +5 more
doaj +1 more source