Results 121 to 130 of about 179,881 (276)

Color science of nanocrystal quantum dots for lighting and displays

open access: yesNanophotonics, 2013
Colloidal nanocrystals of semiconductor quantum dots (QDs) are gaining prominence among the optoelectronic materials in the photonics industry. Among their many applications, their use in artificial lighting and displays has attracted special attention ...
Erdem Talha, Demir Hilmi Volkan
doaj   +1 more source

Photometric support for future astonomical research [PDF]

open access: yes
The I.A.P.P.P. is described and how that organization can provide photometric support for future astronomical research projects such as the 1982-1984 eclipse of epsilon Aurigae discussed at this workshop.
Genet, R. M., Hall, D. S.
core   +1 more source

JHK' Imaging Photometry of Seyfert 1 AGNs and Quasars I: Multi-Aperture Photometry

open access: yes, 2002
Near-infrared $JHK'$ imaging photometry was obtained of 331 AGNs consisting mainly of Seyfert 1 AGNs and quasars (QSOs). This sample was selected to cover a range of radio emission strength, redshift from $z=0$ to 1, and absolute $B$-magnitude from $M_B=-
Alonso-Herrero A.   +8 more
core   +2 more sources

Photometry of Electroluminescence

open access: yesJOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN, 1962
A method of converting the visual photometry of electroluminescence from heterochromatic to homochromatic one. by means of a spectrometer, a template and an integrating sphere, is discussed. This method is more convenient for low brightness light sources than the filter method or step-by-step method.
Syoichi Kurita, Yoshikazu Omoto
openaire   +3 more sources

X-ray photometry [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society: Letters, 2015
Abstract I describe a method for synthesizing photometric passbands for use with current and future X-ray instruments. The method permits the standardization of X-ray passbands and thus X-ray photometry between different instruments and missions.
openaire   +3 more sources

Structural analysis of the NifL‐NifA complex reveals the molecular basis of anti‐activation of nitrogen fixation gene expression in Azotobacter vinelandii

open access: yesThe FEBS Journal, EarlyView.
Using cryo‐EM combined with biochemical and genetic approaches, we mapped the interaction surface between NifL and NifA to gain insights into the regulation of nitrogen fixation genes in A. vinelandii. Our findings suggest that NifL, a homolog of histidine kinases lacking phosphorylation activity, evolved to act as a steric block of NifA activity ...
Marcelo Bueno Batista   +6 more
wiley   +1 more source

Optical and Visual Performance of PWM Controlled InGaN and InGaAlP LEDs for Automotive Lighting Applications

open access: yesIEEE Photonics Journal
This research investigates the light quality and thermal management of InGaN and InGaAlP Light Emitting Diodes (LEDs) under various light regulation methods.
Miroslav Slouka   +3 more
doaj   +1 more source

Infrared identification of IGR J09026-4812 as a Seyfert 1 galaxy

open access: yes, 2009
IGR J09026-4812 was discovered by INTEGRAL in 2006 as a new hard X-ray source. Thereafter, an observation with Chandra pinpointed a single X-ray source within the ISGRI error circle, showing a hard spectrum, and improving its high-energy localisation to ...
Barvainis   +18 more
core   +2 more sources

Exploring the impact of fragrance molecular and skin properties on the evaporation profile of fragrances

open access: yesInternational Journal of Cosmetic Science, EarlyView.
Fragrance molecules release is influenced by skin type, with the effect varying depending on the specific fragrance compound. Two patterns of behaviour have been observed among fragrance molecules: the more volatile compounds whose evaporation increases with surface skin roughness and the less volatile and more lipophilic compounds influenced by skin ...
Elise Hadjiefstathiou   +4 more
wiley   +1 more source

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