Determination of the absorption coefficient of solids in the short-wave region of the millimeter band

1966 ◽  
Vol 5 (2) ◽  
pp. 187-189 ◽  
Author(s):  
E. M. Dianov ◽  
N. A. Irisova
Keyword(s):  
Absorption Coefficient ◽  
Short Wave ◽  
Wave Region ◽  
Short Wave Region

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.

scholarly journals Determination of citrat ions in drugs on molecular luminescence of rutine in complex with yttrium (III)

2019 ◽  
pp. 86-91
Author(s):  
S. V. Beltyukova ◽  
O. V. Malynka ◽  
O. O. Livencova
Keyword(s):  
Luminescence Intensity ◽  
Short Wave ◽  
Dosage Forms ◽  
Rapid Screening ◽  
Maximum Effect ◽  
Ligand Complex ◽  
Molecular Luminescence ◽  
Short Wave Region ◽  
Citrate Ions

The development of methods for qualitative and quantitative analysis of drugs can guarantee their identity and quality. Drugs used in the form of salts of organic bases are often determined by the anionic part of these salts. Citrate ions are a part of many drugs in the form of citric acid, salts of alkaline and alkaline earth metals. The purpose of this study was to develop a method for the luminescent determination of citrate ions in dosage forms using a complex of yttrium (III) with rutine (Rut) as a luminescent probe. It has been experimentally established that citrate ions increase the luminescence intensity of the Y(III)–Rut complex. The spectral and luminescence characteristics of the complex was studied. The luminescence spectrum of the Y(III)–Rut complex has a maximum at λlum = 570 nm. The luminescence intensity of the Y(III)–Rut complex increases and the luminescence peak shifts to the short-wave region of the spectrum (λlum = 522 nm) in the presence of sodium citrate. The maximum effect is observed at a pH of 6.5–7.5. The dependencies of the luminescence intensity on the concentration of Y(III) and Rut for the Y(III)–Rut–Cit complex at the constant concentration of citrate ions (1·10-3 mol/l) were studied. It was established that the maximum luminescence intensity was observed at concentrations of Y(III) – 2·10-3 mol/l and Rut – 5·10-4 mol/l. The linear region of the dependence of the luminescence intensity of the complex on the concentrations of Y(III) and Rut is observed in the range of yttrium concentrations 0.3–2.0·10-3 mol/l and rutine 0.5–5.0·10-4 mol/l. The method of luminescent determination of citrate ions in dosage forms has been developed. The method is based on the use of rutine molecular luminescence in the multi-ligand complex Y(III)–Rut–Cit. The method of determination of citrate ions in dosage forms differs favorably from the existing absence of toxic reagents, expensive equipment, short-term analysis time, allows rapid screening of samples of drugs.

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.

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.

The Effect of Anisotropic Surface Tension on Directional Solidification in the Extremely Short Wave Region

2011 ◽  
Vol 365 ◽  
pp. 130-134
Author(s):  
Ming Wen Chen ◽  
Xin Feng Wang ◽  
Yan Lin Wang ◽  
Zi Dong Wang
Keyword(s):  
Surface Tension ◽  
Expansion Method ◽  
Short Wave ◽  
Planar Interface ◽  
Morphological Stability ◽  
Tension Parameter ◽  
Anisotropic Surface ◽  
Wave Region ◽  
Short Wave Region ◽  
Perturbation Growth

The morphologicalstability of a planar interface with the inclusion of the anisotropic surface tension is studied. The dispersion relation is obtained by means of the multi-variable expansion method. The result shows that the morphological stability of the solidification system in the extremely short wave region depends on the undercooling. As the anisotropic surface tension parameter increases the perturbation growth rate of the interface increases and the solidification system in the extremely short-wave region tends to destabilize.

scholarly journals Квазимолекулярные оптические переходы вблизи резонансных линий атомов Kr и Xe в атмосфере гелия

2020 ◽  
Vol 128 (2) ◽  
pp. 171
Author(s):  
А.З. Девдариани ◽  
А.Л. Загребин ◽  
М.Г. Леднев
Keyword(s):  
Potential Energy ◽  
Excited States ◽  
Theoretical Study ◽  
Short Wave ◽  
Potential Energy Curves ◽  
Hamiltonian Method ◽  
Equilibrium Conditions ◽  
Spectral Profiles ◽  
Wave Region ◽  
Short Wave Region

A theoretical study of spectral profiles near the Kr and Xe resonance lines of the 1,3P1–1S0 transitions produced in the atmosphere of helium under equilibrium conditions is performed. Potential energy curves for the excited states of the Kr(4p55s)+He and Xe(5p56s)+He quasimolecules are obtained in the framework of the consistent use of the effective Hamiltonian method and the pseudopotential method. For the ground state experimental data are used. Based on quasistatic approach the spectral profiles of the quasimolecular absorption and radiation in the short-wave region of the resonance lines are calculated by applying the potential energy curves obtained. The resulting profiles are compared with experimental ones.

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