Light, Electromagnetic Spectrum

Zwinkels, Joanne C.

doi:10.1007/978-3-642-27851-8_204-1

Cited by 23 publications

(11 citation statements)

References 7 publications

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“…UVA is defined as wavelength from 315 to 400nm (ISO 21348 Definitions of Solar Irradiance Spectral Categories). However, the borders of the different subsections of the electromagnetic spectrum are historical and do not correspond to a fixed physical property 36 , 37 . For experiments under lab conditions, we focused our attention on UVA/deep-violet light in the range of 370-430nm, but the “Nelis sunlight source” used emits light across the entire UVA spectrum (see below and Materials and Methods section for further details).…”

Section: Resultsmentioning

confidence: 99%

Seasonal variation in UVA light drives hormonal and behavioural changes in a marine annelid via a ciliary opsin

Rajan¹,

Häfker²,

Arboleda³

et al. 2021

Nat Ecol Evol

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The right timing of animal physiology and behavior ensures the stability of populations and ecosystems. In order to predict anthropogenic impacts on these timings, more insight is needed into the interplay between environment and molecular timing mechanisms. This is particularly true in marine environments. Using high-resolution, long-term daylight measurements from a habitat of the marine annelid Platynereis dumerilii , we find that temporal changes in UVA/deep violet intensities, more than longer wavelengths, can provide annual time information, which differs from annual changes in photoperiod. We developed experimental setups that resemble natural daylight illumination conditions, and automated, quantifiable behavioral tracking. Experimental reduction of UVA/deep violet light (app. 370-430nm) under long photoperiod (LD16:8) significantly decreases locomotor activities, comparable to the decrease caused by short photoperiod (8:16). In contrast, altering UVA/deep violet light intensities does not cause differences in locomotor levels under short photoperiod. This modulation of locomotion by UVA/deep violet light under long photoperiod requires c-opsin1, an UVA/deep violet-sensor employing G i -signalling. C-opsin1 also regulates the levels of rate-limiting enzymes for monogenic amine synthesis and of several neurohormones, including PDF, Vasotocin (Vasopressin/Oxytocin) and NPY-1. Our analyses indicate a complex inteplay between UVA intensities and photoperiod as indicators of annual time.

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Section: Resultsmentioning

confidence: 99%

Seasonal variation in UVA light drives hormonal and behavioural changes in a marine annelid via a ciliary opsin

Rajan¹,

Häfker²,

Arboleda³

et al. 2021

Nat Ecol Evol

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“…In physics, colors are created from reflected light waveSs that are not absorbed by pigments. In this study, the colors appear green and have wavelengths between 480-560 nm (Zwinkels, 2015). The discoloration occurs along with giving the right temperature at the time of sintering.…”

Section: Resultsmentioning

confidence: 58%

“…Electromagnetic spectrum is defined as a graphical representation of electromagnetic waves arranged according to their wavelength. The types of electromagnetic spectrum are radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays (Zwinkels, 2015). Electromagnetic waves are a form of energy that is emitted and absorbed by charged particles, which shows wave-like behavior as it moves through space.…”

Section: Theoretical Framework Electromagnetic Wavementioning

confidence: 99%

“…Mn 4+ can improve the permeability of perovskite (Phan et al, 2012). Therefore, to improve the ability of CoTiO3 to absorb Radar Source: Zwinkels, 2015 waves, this research was conducted Mn doping on CoTiO3. This study aims to analyze whether the mechanical milling method can produce single phase CoTiO3 doping Mn compounds. Based on the theory above, it is expected that Mn doping can increase the absorption ability of Radar waves from CoTiO3.…”

Section: Introductionmentioning

confidence: 99%

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SYNTHESIS AND CHARACTERIZATION OF CoTi(1-X)Mn(X)O3 AS A RADAR ABSORBING MATERIAL

et al. 2020

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<div>To avoid detection from Radio Detection and Ranging (Radar), one of the efforts is to use Radar absorbing material. One of the Radar wave absorbing materials is Perovskite CoTiO3. This Paper investigated the ability of CoTi(1-x)Mn(x)O3 to absorb the Radar wave. CoTi(1-x)Mn(x)O3 with variations x = 0, 0.01, 0.02, and 0.03 have been successfully synthesized using the mechanical milling method. The XRD pattern shows that the sample formed was single phase CoTiO3. Surface morphology resulting from measurements with SEM shows homogeneous particles and an average size of 200 nm. The results of measurements with VNA at X-band frequency (8.20 GHz - 12.4 GHz) show that the absorption ability of electromagnetic waves from CoTiO3 increases with the increase in doping from Mn4+. Maximum results obtained at the composition x=0.03 (CoTi0.97Mn0.03O3) with a reflection loss (RL) value is -14.56 dB (%Abs is 81.3%) at a frequency of 9.96 GHz. This result proves that CoTi(1-x)Mn(x)O3 can be used as a Radar absorbing material at X-band frequency.</div>

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“…is can be attributed to the improvement in the absorption of the thin-film model compared to the nanowire model. On the other hand, in the infrared region (>700 nm), the small CdS shell thickness has the best absorption, which might be due to the lower fill factor (FF) compared to the other nanowires and a large coefficient of trapping of solar rays in nanowires [41][42][43]. e maximum absorption is 97% that was obtained at a wavelength of 500 nm for a CdS shell thickness of 30 nm.…”

Section: Resultsmentioning

confidence: 99%

Optimization of the Shell Thickness of the ZnO/CdS Core-Shell Nanowire Arrays in a CZTS Absorber

Wang

Dramé

Niare

et al. 2022

International Journal of Optics

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Copper-zinc-tin-sulfide (CZTS) solar cells have now become a topic of interest in the solar power generation industry. These are used as an absorber in the zinc oxide (ZnO)/cadmium sulfide (CdS) core-shell nanowire arrays, in order to improve the performance of solar cells. The relationship between the average increase in absorption rates and CdS shell thickness (compared to the thin film) reveals that the optimum thickness with the maximum average absorption rate (39.95%) compared to thin film is 30 nm. The cells’ electrical and optical performance was significantly improved with the introduction of graphene between the ZnO and CdS layers. The shell thicknesses for a better performance of these nanowire solar cells were 30 and 40 nm, with almost the same open-circuit voltage, the similar short-circuit current density, and efficiency, which were 630 mV, 6.39 mA/cm2, and 16.8%, respectively. Furthermore, a minimum reflection of 40% was obtained with these same shell thicknesses.

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Light, Electromagnetic Spectrum

Cited by 23 publications

References 7 publications

Seasonal variation in UVA light drives hormonal and behavioural changes in a marine annelid via a ciliary opsin

Seasonal variation in UVA light drives hormonal and behavioural changes in a marine annelid via a ciliary opsin

SYNTHESIS AND CHARACTERIZATION OF CoTi(1-X)Mn(X)O3 AS A RADAR ABSORBING MATERIAL

Optimization of the Shell Thickness of the ZnO/CdS Core-Shell Nanowire Arrays in a CZTS Absorber

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