Hexalevel Grayscale Imaging and K-Means Clustering to Identify Cloud Types in Satellite Visible Range Images

The InGaAlP quaternary system allows the production of semiconductor lasers emitting light in the visible range of the spectrum. Recent advances in the visible semiconductor diode laser art have established the viability of diode structures with emission wavelengths comparable to the He-Ne gas laser. There has been much interest in the growth of wide bandgap quaternary thin films on GaAs, a substrate most commonly used in optoelectronic applications. There is particular interest in compositions which are lattice matched to GaAs, thus avoiding misfit dislocations which can be detrimental to the lifetime of these materials. As observed in Figure 1, the (AlxGa1-x)0.5In0.5P system has a very close lattice match to GaAs and is favored for these applications.In this work, we have studied the effect of silicon diffusion in GaAs/InGaAlP structures. Silicon diffusion in III-V semiconductor alloys has been found to have an disordering effect which is associated with removal of fine structures introduced during growth. Due to the variety of species available for interdiffusion, the disordering effect of silicon can have severe consequences on the lattice match at GaAs/InGaAlP interfaces.

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Object Detection in Cluttered Range Images Using Edgel Geometry

IEEJ Transactions on Electronics Information and Systems ◽

10.1541/ieejeiss.130.1572 ◽

2010 ◽

Vol 130 (9) ◽

pp. 1572-1580

Author(s):

Dipankar Das ◽

Yoshinori Kobayashi ◽

Yoshinori Kuno

Keyword(s):

Object Detection ◽

Range Images

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Formation of Luminescent Si Nanocrystals by High-Temperature Annealing of Ion-Beam-Sputtered Si/SiO2 Multilayers

MRS Proceedings ◽

10.1557/proc-775-p9.57 ◽

2003 ◽

Vol 775 ◽

Author(s):

Suk-Ho Choi ◽

Jun Sung Bae ◽

Kyung Jung Kim ◽

Dae Won Moon

Keyword(s):

Quantum Confinement ◽

Radiative Recombination ◽

Ion Beam ◽

Quantum Confinement Effect ◽

Visible Range ◽

Ion Beam Sputtering ◽

Transmission Electron ◽

Si Nanocrystals ◽

Beam Sputtering ◽

Microscopy Images

AbstractSi/SiO2 multilayers (MLs) have been prepared under different deposition temperatures (TS) by ion beam sputtering. The annealing at 1200°C leads to the formation of Si nanocrystals in the Si layer of MLs. The high resolution transmission electron microscopy images clearly demonstrate the existence of Si nanocrystals, which exhibit photoluminescence (PL) in the visible range when TS is ≥ 300°C. This is attributed to well-separation of nanocrystals in the higher-TS samples, which is thought to be a major cause for reducing non-radiative recombination in the interface between Si nanocrystal and surface oxide. The visible PL spectra are enhanced in its intensity and are shifted to higher energy by increasing TS. These PL behaviours are consistent with the quantum confinement effect of Si nanocrystals.

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Estimation of precipitation intensity due to image processing from the camera of the visible range

Infocommunications and Radio Technologies ◽

10.15826/icrt.2018.01.3.22 ◽

2018 ◽

Vol 1 (3) ◽

pp. 282-296

Author(s):

V. N. Garmash ◽

◽

D. M. Korobochkin ◽

S. A. Matveev ◽

Y. V. Petrov ◽

...

Keyword(s):

Image Processing ◽

Precipitation Intensity ◽

Visible Range

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An Examination of the Effects of Noise Level on Methods to Determine Curvature in Range Images

Electronic Imaging ◽

10.2352/issn.2470-1173.2019.10.iqsp-325 ◽

2019 ◽

Vol 2019 (10) ◽

pp. 325-1-325-7

Author(s):

Jacob D Hauenstein ◽

Timothy S Newman

Keyword(s):

Noise Level ◽

Range Images

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Fluorescence of BODIPY Dyes in Gas Phase at near Ambient Conditions

10.26434/chemrxiv.11639931.v1 ◽

2020 ◽

Author(s):

Kseniya A. Mariewskaya ◽

Denis Larkin ◽

Yuri Samoilichenko ◽

Vladimir Korshun ◽

Alex Ustinov

Keyword(s):

Gas Phase ◽

Molecular Interactions ◽

Atmospheric Pressure ◽

Fluorescence Spectra ◽

Visible Range ◽

Intrinsic Properties ◽

Ambient Conditions ◽

Ideal Model ◽

Molecular Fluorescence ◽

Tesla Coil

Molecular fluorescence is a phenomenon that is usually observed in condensed phase. It is strongly affected by molecular interactions. The study of fluorescence spectra in the gas phase can provide a nearly-ideal model for the evaluation of intrinsic properties of the fluorophores. Unfortunately, most conventional fluorophores are not volatile enough to allow study of their fluorescence in the gas phase. Here we report very bright gas phase fluorescence of simple BODIPY dyes that can be readily observed at atmospheric pressure using conventional fluorescence instrumentation. To our knowledge, this is the first example of visible range gas phase fluorescence at near ambient conditions. Evaporation of the dye in vacuum allowed us to demonstrate organic molecular electroluminescence in gas discharge excited by electric field produced by a Tesla coil.

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First-Principles Evaluation of the Potential of Borophene as a Monolayer Transparent Conductor

10.26434/chemrxiv.5439880 ◽

2017 ◽

Author(s):

Lyudmyla Adamska ◽

Sridhar Sadasivam ◽

Jonathan J. Foley ◽

Pierre Darancet ◽

Sahar Sharifzadeh

Keyword(s):

First Principles ◽

Density Functional ◽

State Of The Art ◽

Transparent Electrode ◽

Visible Range ◽

Two Dimensional ◽

Transparent Conductor ◽

Many Body ◽

Functional Theory ◽

Many Body Perturbation Theory

Two-dimensional boron is promising as a tunable monolayer metal for nano-optoelectronics. We study the optoelectronic properties of two likely allotropes of two-dimensional boron using first-principles density functional theory and many-body perturbation theory. We find that both systems are anisotropic metals, with strong energy- and thickness-dependent optical transparency and a weak (<1%) absorbance in the visible range. Additionally, using state-of-the-art methods for the description of the electron-phonon and electron-electron interactions, we show that the electrical conductivity is limited by electron-phonon interactions. Our results indicate that both structures are suitable as a transparent electrode.

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Determination of the profile of the temperature field of material heated by continuous laser radiation

Physics and Chemistry of Materials Treatment ◽

10.30791/0015-3214-2020-3-5-10 ◽

2020 ◽

pp. 51-10

Author(s):

B.A. Lapshinov ◽

◽

N.I. Timchenko ◽

Keyword(s):

Temperature Field ◽

Optical Fiber ◽

Prolonged Exposure ◽

Radiation Spectrum ◽

Visible Range ◽

Continuous Laser ◽

Surface Temperature Distribution ◽

Continuous Radiation ◽

Spectral Pyrometry

Spectral pyrometry was used to determine the surface temperature distribution of Si, Nb, Cu, and graphite samples when they were locally heated by continuous radiation of an Nd:YAG laser (λ = 1.064 μm). With prolonged exposure to radiation, a stationary temperature field was established in the samples. The thermal spectra were recorded with a small spectrometer in the visible range in the temperature range above 850 K. The optical fiber used to transmit the radiation spectrum to the spectrometer had an additional diaphragm with a diameter of 1 mm located at a certain distance from the fiber end, which ensured the locality of the recorded spectra. The optical fiber moved continuously along the sample, and the spectrometer recorded up to 100 spectra with a frequency of 5-10 Hz. The temperature profile of the samples was calculated based on the results of processing the spectra using the Spectral Pyrometry program.

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