scholarly journals Temperature Effect to Altitude Corrections and Operational Application

2020 ◽  
Vol 8 (1) ◽  
pp. 18-22
Author(s):  
Jan Cejnar ◽  
Iveta Kameníková
Keyword(s):  
Temperature Effect ◽  
Correction Method ◽  
Final Part ◽  
Air Mass ◽  
Operational Application ◽  
Is Evaluation

The thesis is focused to familiarize the reader with air mass behaviour, legislative requirements and methods of altitude corrections. The goal of the thesis is evaluation of the presently used operational procedures applied to the altitude corrections according to the change of air parameters. The final part of the thesis determines altitudes necessary for corrections and represents the proposal of optimized altitude correction method.

Temperature Effect in Zero-Point Drift

1981 ◽  
Vol 4 (2) ◽  
pp. 260-262
Author(s):  
Z. Kviz
Keyword(s):  
Temperature Effect ◽  
Zero Point ◽  
Temperature Drift ◽  
Pulse Counting ◽  
Atmospheric Extinction ◽  
Air Mass ◽  
The Relationship

The relationship between the observed magnitude of a star and the air-mass takes the shape of a loop. These loops are caused by the zero-point drift of the photometer in use and by the variations of the atmospheric extinction taking place during the observation (Kviz 1979). From observations where the temperature drift of the photometer and of the photomultiplier were recorded, it is evident that the sense of the loops is correlated with the physical temperature of the photo-multiplier. Measurements have been made with the Swiss telescope and the 7-colour Geneva photometer P 7 using pulse counting with PM tube EMI9798 — described in Burnet (1976) and Burnet, Rufener (1979) — at La Silla, Chile.

scholarly journals Evaluation of the Turbulence Model Influence on the Numerical Simulation of Cavitating Flow with Emphasis on Temperature Effect

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 997
Author(s):  
Yilin Deng ◽  
Jian Feng ◽  
Fulai Wan ◽  
Xi Shen ◽  
Bin Xu
Keyword(s):  
Numerical Simulation ◽  
Temperature Effect ◽  
Turbulence Model ◽  
Numerical Solutions ◽  
Turbulent Viscosity ◽  
Turbulence Models ◽  
Correction Method ◽  
Cavitating Flow ◽  
Density Correction ◽  
Different Temperatures

The aim of this paper is to investigate the influence of different turbulence models (k−ε, RNG k−ε, and SST k−ω) on the numerical simulation of cavitating flow in thermosensitive fluid. The filter-based model and density correction method were employed to correct the turbulent viscosity of the three turbulence models. Numerical results obtained were compared to experimental ones which were conducted on the NACA0015 hydrofoil at different temperatures. The applicability of the numerical solutions of different turbulence model was studied in detail. The modified RNG k−ε model has higher accuracy in the calculation of cavitating flow at different temperatures.

Ortho-k lenses fitting in patients with “non-typical” corneas

The Eye ◽  
2020 ◽  
Vol 22 (129) ◽  
pp. 22-29
Author(s):  
Svetlana Kravchuk ◽  
Olga Zhabina
Keyword(s):  
Correction Method ◽  
Diameter Ratio ◽  
Corneal Curvature ◽  
Individual Approach ◽  
Fitting In ◽  
Corneal Diameter ◽  
Clinical Cases

We described two clinical cases of ortho-k lenses fitting in patients with “non-typical” corneal curvature/diameter ratio. The main goal was to acknowledge effective and safe use of this myopia correction method in patients with corneal diameter greater than 11 mm. Individual approach to each patient is the key to a successful and safe ortho-k lenses fitting.

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