Results 51 to 60 of about 6,294 (295)

Excellent luminous flux of WLEDs with flat dual-layer remote phosphor geometry

, 2019
This paper focuses on the comparison of the luminous flux of two dual-remote phosphor structures named flat dual-remote phosphor (FDRP) and concave dual-remote phosphor (CDRP).
Le, Phan Xuan; National Key Labrolatory of Digital Control and System Engineering, Ho Chi Minh City, Vietnam, Trang, Tran Thanh; Van Hien University, Anh, Nguyen Doan Quoc; Ton Duc Thang University, Ho Chi Minh City   +2 more
core   +2 more sources

The influence of operating temperature conditions of led modules on their electro-optical and operational parameters

Технологія та конструювання в електронній апаратурі
Modern LEDs are characterised by high energy efficiency, which makes them one of the most promising light sources in many industries. The efficiency and durability of LED modules largely depend on the temperature conditions of operation.
Demyd Pekur, Anastasiia Minyailo, Ilona Pekur, Viktor Sorokin   +3 more
doaj   +1 more source

Transparent Ceramics Enabling High Luminous Flux and Efficacy for the Next-Generation High-Power LED Light

, 2019
Transparent Ceramics Enabling High Luminous Flux and Efficacy for the Next-Generation High-Power LED ...
Dong, Rui, Lin, Sheng, Du, Yuanbao, Jiang, Haochuan, Sun, Peng, Xie, Rong-Jun, Liu, Shuang, Jiang, Jun, Liu, Yongfu   +8 more
core   +1 more source

Recent Advances in Programmable Metasurfaces and Meta‐Devices

Advanced Electronic Materials, EarlyView.
Programmable metasurfaces enable various novel functionalities by dynamically tuning electromagnetic wavefronts. This article provides a comprehensive review of recent advances in microwave and terahertz programmable metasurfaces, covering electrical, thermal, optical, and mechanical control mechanisms.
Linda Shao, Chong He, Nan Wang, Liming Si, Weiren Zhu   +4 more
wiley   +1 more source

Recalibration of working standard lamps

Journal of Measurement Science and Instrumentation, 2016
In the present work,recalibration of the National Institute for Standards（NIS,Egypt）working standard lamps from Osram Inc.and their associated expanded uncertainty budget were done.A set-up composed of an integrating sphere,a standard photometer and a ...
E M El-Moghazy, F M EL-Sharkawy, Alaa-Eldin Abd-Elmageed   +2 more
doaj  

A NEW METHOD FOR CALCULATING LUMINOUS FLUX USING HIGH DYNAMIC RANGE IMAGING AND ITS APPLICATIONS [PDF]

, 2018
High Dynamic Range (HDR) photography is a camera-aided tool for measuring luminance and glare. This study explored a method of using HDR images to estimate luminous flux (in units of lumens) contributed from light sources and surfaces visible to the ...
Poling, Reid
core  

Construction of Two-Axis Goniophotometer for Measurement of Spatial Distribution of a Light Source and Calculation of Luminous Flux

, 2011
A two-axis goniophotometer is constructed at National Metrology Institute of Turkey (TUBITAK UME) for characterizing photometric properties of compact light sources. With the new device, total luminous flux emitted by a light source at both cap-up or cap-
Sametoglu, F.
core   +2 more sources

Green Ca2La2BO6.5:Pb2+ phosphor: an innovative solution in enhancing the color quality and luminous flux of WLEDs

, 2021
Light-emitting diodes devices that embedded with multiple chips (multi-chip white LEDs (MCW-LEDs)) are an advanced lighitng solution with much potential for improvement in the lighting industry. However, to further the applicacations and quality of white
Anh, Nguyễn Đoàn Quốc; Ton Duc Thang University, That, Phung Ton; Industrial University of Ho Chi Minh City   +1 more
core   +1 more source

Retinal Vessel Segmentation: A Comprehensive Review From Classical Methods to Deep Learning Advances (1982–2025)

Advanced Intelligent Systems, EarlyView.
Four decades of retinal vessel segmentation research (1982–2025) are synthesized, spanning classical image processing, machine learning, and deep learning paradigms. A meta‐analysis of 428 studies establishes a unified taxonomy and highlights performance trends, generalization capabilities, and clinical relevance.
Avinash Bansal, Jan Kubíček, Jana Bahrová, Alice Varyšová, Martin Augustýnek, Marek Penhaker, Juraj Timkovič   +6 more
wiley   +1 more source

Determination of Efficiency of the Vertical Specularly Reflecting Cylindrical Light Shaft for Different Types of Firmaments

Journal of Daylighting
Article is devoted to determination of efficiency of the vertical specularly reflecting cylindrical light shaft for various types of the firmaments standardized by CIE (International Commission on Illumination).
Serhii Litnitskyi, Eugene Pugachov, Taras Kundrat, Vasyl Zdanevych   +3 more
doaj   +1 more source