Theoretical and experimental temperature dependence of GaAs N-off IC's over 120 K to 400 K

Physica B+C ◽  
1985 ◽  
Vol 129 (1-3) ◽  
pp. 403-407
Author(s):  
Bertrand Gabillard ◽  
Christian Rocher ◽  
Marc Rocchi
Keyword(s):  
Temperature Dependence ◽  
Experimental Temperature ◽  
Experimental Temperature Dependence

scholarly journals Impact of ZrO2 Additive on Microstructure, Magnetic Properties, and Temperature Dependence of the Initial Permeability of LiTiZn Ferrite Ceramics

2021 ◽  
Author(s):  
Andrey Malyshev ◽  
Anna B. Petrova ◽  
Anatoly P. Surzhikov
Keyword(s):  
Magnetic Properties ◽  
Temperature Dependence ◽  
Defect Structure ◽  
Initial Permeability ◽  
Experimental Temperature ◽  
Mathematical Treatment ◽  
Experimental Temperature Dependence ◽  
Average Grain Size ◽  
Soft Ferrite ◽  
Microstructure And Magnetic Properties

Abstract The effect of the diamagnetic ZrO2 addition on the microstructure and magnetic properties of LiTiZn ferrite ceramics, including the shape and parameters of the temperature dependence of the initial permeability, has been investigated. The defect structure of ferrite ceramic samples is assessed according to our earlier proposed method based on mathematical treatment of the experimental temperature dependencies of the initial permeability. The method is recommended for defects monitoring of soft ferrite ceramics and ferrite products. It was found that the defect structure of ferrite ceramics increased by 350% with an increase in the concentration of the ZrO2 additive in the range of (0–0.5) wt.%. In this case, for the same samples, the increase in the true physical broadening of reflections is only 20%, and the coercive force by 50%. Simultaneously, the maximum of the experimental temperature dependence of the initial permeability dropped by 45%. The microstructure of all samples is characterized with a similar average grain size according to the SEM data. However, samples with the 0.5wt.% of ZrO2 are characterized by the formation of conglomerates. A linear relationship was obtained between the defect structure and the width of the reflections, which indicates that this parameter is related to the elastic stress of ferrite ceramics.

scholarly journals Temperature Dependence of Raman Frequency Shift in SrWO4 Crystal Studied by Lattice Dynamical Calculations

Crystals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 197 ◽  
Author(s):  
Jun Suda ◽  
Petr Zverev
Keyword(s):  
Frequency Shift ◽  
Temperature Dependence ◽  
Temperature Shift ◽  
Order Perturbation ◽  
Perturbative Approach ◽  
First Order ◽  
Experimental Temperature Dependence ◽  
Raman Lasers ◽  
Anharmonic Term ◽  
Raman Modes

The frequency shift of the Raman modes in strontium tungstate (SrWO4) was investigated in the temperature range from 15 to 295 K. The experimental temperature dependence of the shift was analyzed using both the lattice dynamical calculations and the lattice perturbative approach. We found that the quartic anharmonic term of the first-order perturbation and the cubic term of the second-order perturbation, as well as the thermal expansion, contribute to the temperature shift of the highest-frequency Ag(ν1) mode. The values of the temperature sensitivity of the frequency shift of the Raman modes at room temperature were measured, which is important for developing high-power crystalline Raman lasers and frequency shifters.

Temperature-Dependent Photoluminescence of Zn–Cu–In–S Quaternary Nanocrystals with Different Reaction Time

2016 ◽  
Vol 16 (4) ◽  
pp. 3720-3723
Author(s):  
Xiaojuan Liu ◽  
Xiaosong Zhang ◽  
Lan Li ◽  
Mingxue Zhu ◽  
Ping Zhou
Keyword(s):  
Reaction Time ◽  
Temperature Dependence ◽  
Line Width ◽  
Experimental Temperature ◽  
Full Width ◽  
Temperature Dependent ◽  
Intensity Decrease ◽  
Energy Line ◽  
Toxic Environment ◽  
Temperature Dependent Photoluminescence

Non-toxic, environment-benign colloidal ZnCuInS Nanocrystals (ZCIS NCs) were synthesized and the temperature dependence of the photoluminescence (PL) energy, line width, and intensity for the ZCIS NCs with different reaction time were studied in the temperature range from 50 to 280 K. Generally, for typical ZCIS NCs ensemble, it has been constantly observed that the PL peaks energy decrease with the experimental temperature raising and the value of Eg(0) decrease with the increase of reaction time. Furthermore, the full width at half maximums (FWHM) of the PL spectra increased with the experimental temperature raising. It was found that the temperature dependence of the integrated PL intensity of ZCIS NCs decrease with the experimental temperature raising and the intensity decrease much with increasing reaction time.

scholarly journals A Prediction Model for Methane Adsorption Capacity in Shale Gas Reservoirs

Energies ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 280 ◽  
Author(s):  
Jie Zou ◽  
Reza Rezaee
Keyword(s):  
Prediction Model ◽  
Temperature Dependence ◽  
Adsorption Capacity ◽  
Shale Gas ◽  
Clay Content ◽  
Methane Adsorption ◽  
Experimental Temperature ◽  
Well Log ◽  
Gas Reservoirs ◽  
Log Data

Estimation of methane adsorption capacity is crucial for the characterization of shale gas reservoirs. The methane adsorption capacity in shales is measured using high-pressure methane adsorption to obtain the adsorption isotherms, which can be fitted by Langmuir model. The determined Langmuir parameters can provide the methane adsorption capacity under actual reservoir conditions. In this study, a prediction model for the methane adsorption in shales was constructed based on 66 samples from 6 basins in China and Western Australia. The model was established in four steps: a model of Langmuir volume at experimental temperature, the temperature dependence of Langmuir volume, a model of Langmuir pressure, the temperature dependence of Langmuir pressure. In the model of Langmuir volume at experimental temperature, total organic carbon (TOC) and clay content (Vsh) were considered. A positive relationship was observed between the TOC and the temperature effect on the Langmuir volume. As the Langmuir pressure is sensitive to various factors, the Langmuir pressure at experimental temperature shows no trend with the TOC, clay content and thermal maturity, but a positive trend with the Langmuir volume. The results of this study can help log analysts to quantify adsorbed gas from well-log data since TOC and Vsh, which are the measure inputs of the introduced models, can be obtained from well-log data as well.

Temperature Dependence of the Critical Electron Dose for Fatty Acid Monolayers

1982 ◽  
Vol 40 ◽  
pp. 78-79
Author(s):  
Kenneth H. Downing ◽  
Robert M. Glaeser
Keyword(s):  
Electron Beam ◽  
Fatty Acid ◽  
Inelastic Scattering ◽  
Temperature Dependence ◽  
Structural Damage ◽  
Direct Result ◽  
Second Step ◽  
Strong Temperature Dependence ◽  
Electron Dose ◽  
Covalent Bonds

The structural damage of molecules irradiated by electrons is generally considered to occur in two steps. The direct result of inelastic scattering events is the disruption of covalent bonds. Following changes in bond structure, movement of the constituent atoms produces permanent distortions of the molecules. Since at least the second step should show a strong temperature dependence, it was to be expected that cooling a specimen should extend its lifetime in the electron beam. This result has been found in a large number of experiments, but the degree to which cooling the specimen enhances its resistance to radiation damage has been found to vary widely with specimen types.

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