scholarly journals Method of obtaining and studying the optical properties of carbon quantum dots.

2019 ◽  
Vol 19 (3) ◽  
pp. 226-229
Author(s):  
S.D. Bardasevska ◽  
I.M. Budzulyak ◽  
S.I. Budzulyak ◽  
B.I. Rachiy ◽  
R.V. Ilnytskyi ◽  
...  
Keyword(s):  
Raw Materials ◽  
Wavelength Region ◽  
Short Wave ◽  
Carbon Quantum Dots ◽  
Long Wavelength ◽  
Plant Raw Materials ◽  
Wave Region ◽  
Exciton Mechanism ◽  
Short Wave Region ◽  
Kinetics Of

The proposed method of synthesis of CQDs on the basis of nanoporous carbon obtained from plant raw materials. It is established that in the short-wave region a band is registered, which is due to the exciton mechanism of recombination, whereas in the long-wavelength region it is related to the state of defects. The kinetics of PL extinction is not strictly exponential, which most likely indicates the distributed nature of fading from individual emitters.

Comparison and analysis of optical properties between vertical and inclined GaAs nanostructures

2020 ◽  
Vol 34 (32) ◽  
pp. 2050311
Author(s):  
Yan Sun ◽  
Lei Liu ◽  
Zhisheng Lv ◽  
Xingyue Zhangyang ◽  
Feifei Lu ◽  
...  
Keyword(s):  
Light Absorption ◽  
Structural Parameters ◽  
Short Wave ◽  
Carrier Distribution ◽  
Wave Region ◽  
Absorption Performance ◽  
Inclined Angle ◽  
Short Wave Region ◽  
Light Capture ◽  
Nanowire Structure

In this paper, COMSOL multi-physics field commercial software was used to design the simulation model of GaAs nanostructures array (vertical nanoholes, vertical nanowires, inclined nanoholes and inclined nanowires), and the changes of light absorption of these structures in the wavelength range of 200–840 nm were studied. The electric field distribution, carrier distribution and quantum efficiency of nanostructures are calculated and analyzed under certain structural parameters. The results show that the light absorption performance of nanowire structure in the short-wave region is better than that of the nanoholes structure. With a certain inclined angle, the inclined nanowire structure has a stronger light capture ability than the vertical nanowire structure, and the light absorption of nanowire structure has a minimum value at the 550 nm wavelength.

Mechanical, electronic and optical properties of bulk and monolayer GeSe2

2020 ◽  
Vol 34 (06) ◽  
pp. 2050034
Author(s):  
Congcong Zeng ◽  
Ru Zhang ◽  
Liyuan Wu ◽  
Qian Wang ◽  
Xi Chen ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
First Principles ◽  
Short Wave ◽  
Wide Bandgap ◽  
First Principles Calculations ◽  
Electronic And Optical Properties ◽  
Wave Region ◽  
Bulk Structure ◽  
Short Wave Region

[Formula: see text], a semiconductor with wide bandgap, has attracted wide attention due to its excellent workability in the short-wave region. Here, we reported the mechanical, electronic and optical properties of bulk and monolayer [Formula: see text] by using first-principles calculations. Our results show that both Young’s modulus and Poisson’s ratio of the monolayer [Formula: see text] exhibit anisotropic behaviors. From the bulk to the monolayer structure, the direct bandgap increases from 2.496 eV to 3.030 eV. Compared to the bulk structure, the monolayer [Formula: see text] exhibits the small average effective mass and significant anisotropy in optical absorption, indicating potential optoelectronic applications.

Kinetics of Extraction of Biologically Active Substances from Medicinal Plant Raw Materials using Different Techniques

2017 ◽  
Vol 72 (6) ◽  
pp. 260-266 ◽  
Author(s):  
V. V. Milevskaya ◽  
T. S. Butylskaya ◽  
Z. A. Temerdashev ◽  
M. A. Statkus ◽  
N. V. Kiseleva
Keyword(s):  
Medicinal Plant ◽  
Raw Materials ◽  
Biologically Active Substances ◽  
Biologically Active ◽  
Plant Raw Materials ◽  
Kinetics Of ◽  
Active Substances

Air-Stable In-Plane Anisotropic GeSe2 for Highly Polarization-Sensitive Photodetection in Short Wave Region

2018 ◽  
Vol 140 (11) ◽  
pp. 4150-4156 ◽  
Author(s):  
Yusi Yang ◽  
Shun-Chang Liu ◽  
Wei Yang ◽  
Zongbao Li ◽  
Yang Wang ◽  
...  
Keyword(s):  
Short Wave ◽  
Wave Region ◽  
Short Wave Region

scholarly journals The Possibility of Beta decay in the Atmospheres of Nuclei of Planetary Nebulae

1968 ◽  
Vol 34 ◽  
pp. 332-338
Author(s):  
G.A. Gurzadian
Keyword(s):  
Beta Decay ◽  
Planetary Nebulae ◽  
Short Wave ◽  
Relativistic Electrons ◽  
Radio Radiation ◽  
High Energies ◽  
Strong Deviation ◽  
Stationary Objects ◽  
Wave Region ◽  
Short Wave Region

At present there is some basis for questioning the usual presentation of the nuclei of planetary nebulae as being ordinary stars. If the quantity of mass released by a star during its formation or at some stage of its evolution serves as a criterion for its not being stationary, then the nuclei of planetary nebulae are hardly the most non-stationary objects. A strong deviation from Planck's radiation law may also serve as a criterion for non-stationarity when the deviation occurs in the far short-wave region of the spectrum in nuclei and similar objects (e.g. stars of Wolf-Rayet which are not nuclei of planetary nebulae). Finally, the existence of synchrotron radio radiation in some planetary nebulae must be explained by the exceptional activity of their nuclei. It would seem that the nuclei of these nebulae are suppliers if not of typical relativistic electrons then at least of electrons with high energies.

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