scholarly journals Terahertz Optical Properties of KTiOPO4 Crystal in the Temperature Range of (−192)–150 °C

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 125
Author(s):  
Alina Rybak ◽  
Valery Antsygin ◽  
Alexander Mamrashev ◽  
Nazar Nikolaev
Keyword(s):  
Experimental Study ◽  
Optical Properties ◽  
Frequency Dependence ◽  
Optical Axis ◽  
Potassium Titanyl Phosphate ◽  
Refractive Indices ◽  
Frequency Range ◽  
Temperature Range ◽  
Ktp Crystal ◽  
Optical Axes

This paper presents the results of an experimental study of the optical properties of highly resistive monocrystals of potassium titanyl phosphate (KTiOPO4, KTP) in the frequency range of 0.2–1 THz and the temperature range of (−192)–150 °C. The dispersion of the refractive indices is approximated in the form of Sellmeier equations. The results show that the temperature dependence of the Sellmeier coefficients for all three principal optical axes is close to linear and, most likely, does not experience an extremum in the vicinity of the activation temperatures of the cationic conductivity of the KTP crystal at (−73)–(−23) °C. Weak frequency dependence of an optical axis direction angle VZ in the range of 0.2–1 THz is confirmed. However, the change in VZ with temperature is three times higher than reported before.

scholarly journals Surface and optical properties of ethylene glycol-based nanofluids containing silicon dioxide nanoparticles: an experimental study

2021 ◽  
Author(s):  
Julian Traciak ◽  
Jolanta Sobczak ◽  
Rafał Kuzioła ◽  
Joanna Wasąg ◽  
Gaweł Żyła
Keyword(s):  
Experimental Study ◽  
Surface Tension ◽  
Optical Properties ◽  
Ethylene Glycol ◽  
Silicon Dioxide ◽  
Silicon Dioxide Nanoparticles ◽  
Temperature Range ◽  
Ring Method ◽  
Density Surface ◽  
Commercial Equipment

AbstractIn this paper, the results of the experimental study on density, surface tension and optical properties of ethylene glycol-based nanofluids containing silicon dioxide have been presented. The nanofluid-air surface tension values were determined in the temperature range from 283.15 K to 318.15 K with Du Noüy ring method with the commercial equipment and self-made station. To determine the surface tension of a fluid, the information about its density is required; therefore, density of all examined nanofluids was measured in the same temperature range, and results were summarized in the paper. The refractive index of SiO$$_2$$ 2 -EG nanofluids was determined in the same temperature range in which the surface tension was examined. Finally, the extinction (UV–Vis spectra) of these materials was examined and presented.

scholarly journals EXTENSION OF THE FREQUENCY-RANGE OF INTERFEROMETERS FOR THE "MAGNETIC" COMPONENTS OF GRAVITATIONAL WAVES?

2007 ◽  
Vol 22 (13) ◽  
pp. 2361-2381 ◽  
Author(s):  
CHRISTIAN CORDA
Keyword(s):  
Data Analysis ◽  
Frequency Dependence ◽  
Gravitational Waves ◽  
Response Functions ◽  
Frequency Range ◽  
Total Response ◽  
High Frequencies ◽  
Magnetic Components ◽  
Linear Dimensions ◽  
Dominant Part

Recently, with an enlightening treatment, Baskaran and Grishchuk have shown the presence and importance of the so-called "magnetic" components of gravitational waves (GW's), which have to be taken into account in the context of the total response functions of interferometers for GW's propagating from arbitrary directions. In this paper the analysis of the response functions for the magnetic components is generalized in its full frequency dependence, while in the work of Baskaran and Grishchuk the response functions were computed only in the approximation of wavelength much larger than the linear dimensions of the interferometer. It is also shown that the response functions to the magnetic components grow at high frequencies, differently from the values of the response functions to the well-known ordinary components that decrease at high frequencies. Thus the magnetic components could in principle become the dominant part of the signal at high frequencies. This is important for a potential detection of the signal at high frequencies and confirms that the magnetic contributions must be taken into account in the data analysis. More, the fact that the response functions of the magnetic components grow at high frequencies shows that, in principle, the frequency-range of Earth-based interferometers could extend to frequencies over 10000 Hz.

An Experimental Study of Interfacial Friction-Hot Ring Compression

1992 ◽  
Vol 114 (1) ◽  
pp. 13-18 ◽  
Author(s):  
F. Wang ◽  
J. G. Lenard
Keyword(s):  
Experimental Study ◽  
True Strain ◽  
Interfacial Friction ◽  
Strain Rates ◽  
Compression Tests ◽  
Temperature Range ◽  
Ring Compression ◽  
Constant Friction

Ring compression tests were conducted at constant true strain rates in the temperature range of 900–975°C. The constant friction shear factor, m, was determined using a calibration chart. Scaling was permitted during the experiments in which a glass based lubricant was also used. Frictional conditions were affected most by the rate of strain; increasing it led to lower values of m.

scholarly journals A combined theoretical and experimental study of electronic structure and optical properties of β-ZnMoO4 microcrystals

Polyhedron ◽  
2013 ◽  
Vol 54 ◽  
pp. 13-25 ◽  
Author(s):  
L.S. Cavalcante ◽  
E. Moraes ◽  
M.A.P. Almeida ◽  
C.J. Dalmaschio ◽  
N.C. Batista ◽  
...  
Keyword(s):  
Experimental Study ◽  
Optical Properties ◽  
Electronic Structure
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