Determination of In-Orbit Plume Characteristics from Laboratory Measurements

2006 ◽  
Author(s):  
Yassir Azziz ◽  
Manuel Martinez-Sanchez ◽  
James Szabo
Keyword(s):  
Laboratory Measurements

scholarly journals Energy yield determination of concentrator solar cells using laboratory measurements

2015 ◽  
Author(s):  
John F. Geisz ◽  
Iván García ◽  
William E. McMahon ◽  
Myles A. Steiner ◽  
Mario Ochoa ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Yield ◽  
Laboratory Measurements ◽  
Yield Determination

scholarly journals Are We Correctly Using Discharge Coefficients for Side Weirs? Insights from a Numerical Investigation

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2585
Author(s):  
Mario Di Bacco ◽  
Anna Rita Scorzini
Keyword(s):  
Neural Networks ◽  
Sensitivity Analysis ◽  
Discharge Coefficient ◽  
Experimental Methodology ◽  
Laboratory Measurements ◽  
Experimental Assessment ◽  
Discharge Coefficients ◽  
Side Weirs ◽  
Water Depths

A key issue in the design of side weirs is the experimental assessment of the discharge coefficient. This can be determined by laboratory measurements of discharge and water depths at the up- and downstream ends of the weir by using De Marchi’s approach, consisting in the solution of the 1D dynamic equation of spatially varied steady flow with non-uniform discharge, under the assumption of energy conservation. This study originates from a recent alarming proliferation of works that evaluate the discharge coefficient for side weirs without clearly explaining the experimental methodology and/or even incorrectly applying modelling approaches, thus generating possible misinterpretations of the results. In this context, the present paper aims to highlight the effects of using oversimplified and/or heterogenous models (relying on different assumptions) for the experimental determination of the discharge coefficient for side weirs. Furthermore, a sensitivity analysis is performed to detect the most influencing hydraulic and geometric parameters on each considered model. The overall results clearly indicate the wrongness of using or building not homogeneous discharge coefficient datasets to obtain and/or compare predictive experimental discharge coefficient formulas. We finally show how neural networks could provide a possible solution to these heterogeneity issues.

Determination of plasma bicarbonate of neonates in intensive care.

1988 ◽  
Vol 34 (7) ◽  
pp. 1483-1485 ◽  
Author(s):  
P Masters ◽  
M E Blackburn ◽  
M J Henderson ◽  
J F Barrett ◽  
P R Dear
Keyword(s):  
Intensive Care ◽  
Clinical Significance ◽  
Systematic Bias ◽  
Blood Gas ◽  
Laboratory Measurements ◽  
Blood Samples ◽  
Plasma Bicarbonate ◽  
A Value ◽  
Hasselbalch Equation

Abstract Most modern blood-gas analyzers are programmed to use the Henderson-Hasselbalch equation to calculate a value for plasma bicarbonate. It has been suggested, however, that among acutely ill patients, including newborns, these calculated values may be at variance with measured total CO2. To assess the clinical significance of such errors, we compared calculated bicarbonate with measured total CO2 in 79 blood samples from 40 babies in intensive care. The calculated bicarbonate values consistently exceeded the measured values by about 1.5 mmol/L. Of the errors, 94% were within the range -10% to +20%. When the systematic bias was removed, calculated and measured bicarbonate values agreed within +/- 3.30 mmol/L in 95% of cases. Because calculated values can be obtained much more quickly and frequently than laboratory measurements, we believe that these limits are clinically acceptable.

APPLICATION OF CONTINUOUS VELOCITY LOGS TO DETERMINATION OF FLUID SATURATION OF RESERVOIR ROCKS

Geophysics ◽  
1956 ◽  
Vol 21 (3) ◽  
pp. 739-754 ◽  
Author(s):  
Warren G. Hicks ◽  
James E. Berry
Keyword(s):  
Field Data ◽  
Acoustic Velocity ◽  
Gas Oil ◽  
Laboratory Measurements ◽  
Reservoir Rocks ◽  
Fluid Saturation ◽  
Saturated Sands ◽  
Similar Character ◽  
Water Saturated

Recent studies of continuous acoustic velocity logs indicate that these logs may provide important assistance in differentiating gas, oil, and water saturations in reservoir rocks. In general, velocities are appreciably lower in sands carrying oil or gas than in water‐saturated sands of otherwise similar character. Specific examples from field logs illustrate this application. Laboratory measurements have been made of acoustic velocity of synthetic and natural rocks. Published studies, both empirical and theoretical, of other workers concerned with the transmission of sound in porous media have been considered. All of these at least qualitatively confirm the conclusions drawn from field data.

Sound Insulation Determination of Door

2014 ◽  
Vol 1057 ◽  
pp. 215-222 ◽  
Author(s):  
Dušan Dlhý ◽  
Peter Tomašovič
Keyword(s):  
Structural Complexity ◽  
Point Of View ◽  
Sound Insulation ◽  
Laboratory Measurements ◽  
Door Frame ◽  
Small Change ◽  
Sound Reduction ◽  
Reduction Index

The structural complexity of a door causes difficulties in the description of its behavior from an acoustical point of view. In many cases, even a small change can cause a big difference in its sound-isolating properties. To determine the acoustical quality of a door, it is important to perform laboratory measurements of the door structure and door frame, the gaps including. A mathematical analysis based on experimental measurements of the sound reduction index of several door constructions was used to determine the acoustical door categories. The equations for calculating the sound reduction index, which were introduced in this paper, should help in the design of a suitable door from an acoustical point of view.

scholarly journals Minor pressure losses for different connections of PP-R and PEX/Al/PEX installation pipes

2019 ◽  
Vol 100 ◽  
pp. 00045
Author(s):  
Kinga Ligaj ◽  
Marcin K. Widomski ◽  
Anna Musz-Pomorska
Keyword(s):  
Reynolds Number ◽  
Numerical Modeling ◽  
Pressure Loss ◽  
Flow Resistance ◽  
Direct Connection ◽  
Laboratory Measurements ◽  
Local Pressure ◽  
Pressure Losses ◽  
Numerical Research

This paper presents results of laboratory and numerical research concerning determination of water flow resistance through three types of two-way connection of polymer installation pipes: PP-R 20x3.4 mm and PEX/Al/PEX 16x2.0 mm. The following fittings were applied: the direct connection, pipe union and coupler, allowing to test six measurement variants. The laboratory measurements of pressure loss for the tested pipes connections were performed for variable Reynolds number, from approx. 5000 to 50000. The numerical modeling allowing to assess the distributions of velocity of flow and turbulence intensity were performed using FLUENT, Ansys Inc. modelling software. The relations between determined values of minor pressure loss and coefficients of local pressure losses and type of pipes connection, direction of flow as well as the value of Reynolds number were observed. The applied nonparametric statistics, combined with multi comparison, showed that in most cases of analyzed connections, besides the pipe union, the observed differences in pressure losses for various directions of flows are statistically significant for p = 0.05.

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