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Plants ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 637
Author(s):  
Paul Kusuma ◽  
Boston Swan ◽  
Bruce Bugbee

The photon flux in the green wavelength region is relatively enriched in shade and the photon flux in the blue region is selectively filtered. In sole source lighting environments, increasing the fraction of blue typically decreases stem elongation and leaf expansion, and smaller leaves reduce photon capture and yield. Photons in the green region reverse these blue reductions through the photoreceptor cryptochrome in Arabidopsis thaliana, but studies in other species have not consistently shown the benefits of photons in the green region on leaf expansion and growth. Spectral effects can interact with total photon flux. Here, we report the effect of the fraction of photons in the blue (10 to 30%) and green (0 to 50%) regions at photosynthetic photon flux densities of 200 and 500 µmol m−2 s−1 in lettuce, cucumber and tomato. As expected, increasing the fraction of photons in the blue region consistently decreased leaf area and dry mass. By contrast, large changes in the fraction of photons in the green region had minimal effects on leaf area and dry mass in lettuce and cucumber. Photons in the green region were more potent at a lower fraction of photons in the blue region. Photons in the green region increased stem and petiole length in cucumber and tomato, which is a classic shade avoidance response. These results suggest that high-light crop species might respond to the fraction of photons in the green region with either shade tolerance (leaf expansion) or shade avoidance (stem elongation).


2021 ◽  
pp. 12-21

A method is proposed for calculating the dependences of the emissivity of subwavelength parti-cles (SP) from various materials in the form of disks, spheres, cubes and cylinders on their sizes (D) and temperature (T), for cases when external electromagnetic radiation practically does not affect their temperature. For all the listed types of particles, the cutoff wavelengths λcutoffdepending on the size of the SP and the particle shape coefficients ξare determined. With a decrease in the particle size, from the radiation spectrum, which was originally described by Planck's law, wavelengths exceeding λcutoffare gradually excluded. This leads to a decrease in the integral radiation, a decrease in the emissivity and a shift of the radiation spectrum to the blue region. A simple scheme is also proposed for determining ε -the emission coefficients of the midrange according to the calculated graph ε (U), where: U = (ξ × D × T) / B; B is the con-stant of the Wien displacement formula.


Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 844
Author(s):  
U. Fawad ◽  
H. J. Kim ◽  
Ibrahim Gul ◽  
Matiullah Khan ◽  
Sajjad Tahir ◽  
...  

The well-known solid-state reaction method is used for the synthesis of Tb doped LuGd2Ga2Al3O12 phosphor. XRD and SEM techniques are used for the phase and structural morphology of the synthesized phosphor. UV, X-ray and proton induced spectroscopy is used to study the luminescence properties. LuGd2Ga2Al3O12:Tb3+ phosphor shows its highest peak in green and blue region. The two major emission peaks correspond to 5D3→7FJ (at 480 to 510 nm, blue region) and 5D4→7FJ (at 535 to 565 nm, green region). Green emission is dominant; therefore, it may be used as an efficient green phosphor. The absorption spectra of the synthesized material matches well with the spectra of light emitting diodes (LEDs); therefore, it may have applications in LEDs. X-ray spectroscopic study suggests that this phosphor may have uses in medical applications, such as X-ray imaging. The synthesized phosphor exhibits 81% efficacy in comparison to the commercial plasma display panel material (Gd2O2S:Tb3+). The Commission Internationale de l’Eclairage (CIE) chromaticity diagram is obtained for this phosphor. The decay time of ms range is measured for the synthesized phosphor.


ChemPhysChem ◽  
2020 ◽  
Vol 21 (17) ◽  
pp. 1884-1884
Author(s):  
Yasuchika Hasegawa ◽  
Katsumasa Koide ◽  
Makoto Tsurui ◽  
Yuichi Kitagawa ◽  
Takayuki Nakanishi ◽  
...  

ChemPhysChem ◽  
2020 ◽  
Vol 21 (17) ◽  
pp. 2019-2024
Author(s):  
Yasuchika Hasegawa ◽  
Katsumasa Koide ◽  
Makoto Tsurui ◽  
Yuichi Kitagawa ◽  
Takayuki Nakanishi ◽  
...  

2020 ◽  
Vol 21 (1) ◽  
pp. 13-18
Author(s):  
P. P. Maksimyak ◽  
C. Yu. Zenkova ◽  
V. M. Tkachuk

The paper is devoted to the study of the optical properties of carbon nanoparticles synthesized by the method developed during our experimental studies. The optimal conditions for the creation of carbon nanostructures with predetermined properties are defined. Nanoparticles of the size of about 100 nm were obtained, the maximum of absorption of which is localized at wavelengths in the violet-blue region of the spectrum, while the maximum of luminescence – in the green region of the spectrum. The assumption is made about the possibility of using the obtained particles for correlation diagnostics of optical speckle fields.


2020 ◽  
Vol 44 (16) ◽  
pp. 6652-6660
Author(s):  
Mohanakumaran Athira ◽  
Ramakrishnan Suseela Meerakrishna ◽  
Ponnusamy Shanmugam

A BF3·Et2O mediated reaction of co-planar 9-(phenylethynyl)-9H-fluoren-9-ol with various isatin imines afforded title compounds in excellent yield. The products showed luminescence in the blue region with large Stokes shift.


Nanoscale ◽  
2020 ◽  
Vol 12 (46) ◽  
pp. 23809-23816
Author(s):  
Soniya S. Raja ◽  
Chang-Wei Cheng ◽  
Shangjr Gwo

The epitaxial aluminum film exhibits long plasmon lengths in the full visible region and outperforms silver in the deep blue region.


CrystEngComm ◽  
2020 ◽  
Vol 22 (45) ◽  
pp. 7903-7917
Author(s):  
Lílian Cruz ◽  
Mayara M. Teixeira ◽  
Vinícius Teodoro ◽  
Natalia Jacomaci ◽  
Letícia O. Laier ◽  
...  

Varying the concentration of ethylenediamine resulted in hollow or solid Ag/α-Ag2WO4 microflowers that emit light in the red region or in the blue region, respectively.


Optik ◽  
2019 ◽  
Vol 178 ◽  
pp. 992-998 ◽  
Author(s):  
Zihao Lin ◽  
Yuxiang Long ◽  
Xupeng Zhu ◽  
Peng Dai ◽  
Feng Liu ◽  
...  

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