The analysis of the influence of temperature and atmospheric pressure measurement errors on the flight altitude determination error

2016 ◽  
pp. 35-52
Author(s):  
Michał Ciałkowski ◽  
Wojciech Krupa ◽  
Andrzej Frąckowiak ◽  
Radosław Górzeński
Keyword(s):  
Pressure Measurement ◽  
Atmospheric Pressure ◽  
Measurement Errors ◽  
Flight Altitude ◽  
Influence Of Temperature ◽  
Determination Error

Kinetic Study of the Diels-Alder Reaction of Cyclopentadiene with Bis(2-Ethylhexyl) Maleate

2013 ◽  
Vol 634-638 ◽  
pp. 541-545 ◽  
Author(s):  
Jun Seong Park ◽  
Dae Hee Yun ◽  
Tae Won Ko ◽  
Yong Sung Park ◽  
Je Wan Woo
Keyword(s):  
Kinetic Study ◽  
Reaction Temperature ◽  
Atmospheric Pressure ◽  
Arrhenius Equation ◽  
Alder Reaction ◽  
Diels Alder ◽  
Influence Of Temperature ◽  
Diels Alder Reaction ◽  
Influence Of Temperature On ◽  
Kinetics Of

The kinetics of the Diels-Alder reaction of cyclopentadiene with bis(2-ethylhexyl) maleate has been studied at temperatures between 25 and 100 °C and at atmospheric pressure. The influence of temperature on the kinetic constants was determined by fitting the results to the Arrhenius equation. As a result, fitting line similar with the linear curve of the Arrhenius equation at 25, 30 and 40 °C. However, the fitting curve, at 60, 80 and 100 °C, tended towards the outside of the curve in the form of Arrhenius equation. The ratio of endo/exo was a slight change from increase of the reaction temperature.

Total Pressure Correction of a Sub-Miniature Five-Hole Probe in Areas of Pressure Gradients

2012 ◽  
Author(s):  
J. Town ◽  
A. Akturk ◽  
C. Camcı
Keyword(s):  
Pressure Measurement ◽  
Measurement Errors ◽  
Total Pressure ◽  
Pressure Gradients ◽  
Pressure Data ◽  
Flow Conditions ◽  
Complex Flow ◽  
Ducted Fan ◽  
The Difference ◽  
Best Fit

Five-hole probes, being a dependable and accurate aerodynamic tools, are excellent choices for measuring complex flow fields. However, total pressure gradients can induce measurement errors. The combined effect of the different flow conditions on the ports causes the measured total pressure to be prone to a greater error. This paper proposes a way to correct the total pressure measurement. The correction is based on the difference between the measured total pressure data of a Kiel probe and a sub-miniature prism-type five-hole probe. By comparing them in a ducted fan related flow field, a line of best fit was constructed. The line of best fit is dependent on the slope of the line in a total pressure versus span and difference in total pressure between the probes at the same location. A computer program, performs the comparison and creates the correction equation. The equation is subsequently applied to the five-hole probe total pressure measurement, and the other dependent values are adjusted. The validity of the correction is then tested by placing the Kiel probe and the five-hole probe in ducted fans with a variety of different tip clearances.

scholarly journals High Resolution Nano-gap Pirani Sensor for Pressure Measurement in Wide Dynamic Range Operation Around Atmospheric Pressure

2016 ◽  
Vol 168 ◽  
pp. 798-801 ◽  
Author(s):  
Julien Claudel ◽  
Cecile Ghouila-Houri ◽  
Jean-Claude Gerbedoen ◽  
Quentin Gallas ◽  
Eric Garnier ◽  
...  
Keyword(s):  
High Resolution ◽  
Pressure Measurement ◽  
Atmospheric Pressure ◽  
Dynamic Range ◽  
Wide Dynamic Range

scholarly journals Leaching of polymetallic Cu-Zn-Pb concentrate with sodium nitrate in sulphuric acid

Tehnika ◽  
2021 ◽  
Vol 76 (4) ◽  
pp. 426-436
Author(s):  
Miroslav Sokić ◽  
Branislav Marković ◽  
Dušan Milojkov ◽  
Aleksandra Patarić ◽  
Mladen Bugarčić ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Sulphuric Acid ◽  
Sodium Nitrate ◽  
Atmospheric Pressure ◽  
Oxidizing Agent ◽  
Influence Of Temperature ◽  
Leaching Process ◽  
Gibbs Energies ◽  
Copper Zinc ◽  
Solid Residuals

The results of polymetallic sulphide Cu-Zn-Pb concentrate leaching with sulphuric acid in the presence of sodium nitrate as an oxidizing agent, at atmospheric pressure, are presented and discussed. Chemical composition and phase ratio of the starting concentrate and solid residuals after the leaching process are shown. Chemical reactions of leaching and their thermodynamic probabilities are predicted based on the calculated Gibbs energies and analysis of E-pH diagrams. The influence of temperature and time on the leaching degree of the concentrate's components is experimentally determined. It is shown that it is possible to obtain copper, zinc and iron in a solute form, while lead in the anglesite (PbSO4) form remains in the solid residual after the leaching process. The iron is being oxidized to Fe(III)-sulphate, which takes part in a sulphide leached minerals and turns into Fe(II)-sulphate.

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