Characterization of Local Fuel Concentrations and Internal Dynamics in D.I. Diesel Sprays

1997 ◽  
Author(s):  
José Ma Desantes ◽  
Jean Arrègle ◽  
José. V. Pastor
Keyword(s):  
Diesel Sprays ◽  
Internal Dynamics

scholarly journals How wide is the window opened by high-resolution relaxometry on the internal dynamics of proteins in solution?

2021 ◽  
Vol 75 (2-3) ◽  
pp. 119-131
Author(s):  
Albert A. Smith ◽  
Nicolas Bolik-Coulon ◽  
Matthias Ernst ◽  
Beat H. Meier ◽  
Fabien Ferrage
Keyword(s):  
Nuclear Magnetic Resonance ◽  
High Resolution ◽  
High Field ◽  
Rotational Diffusion ◽  
Relaxation Data ◽  
Internal Dynamics ◽  
Nmr Relaxometry ◽  
Analysis Of Dynamics

AbstractThe dynamics of molecules in solution is usually quantified by the determination of timescale-specific amplitudes of motions. High-resolution nuclear magnetic resonance (NMR) relaxometry experiments—where the sample is transferred to low fields for longitudinal (T1) relaxation, and back to high field for detection with residue-specific resolution—seeks to increase the ability to distinguish the contributions from motion on timescales slower than a few nanoseconds. However, tumbling of a molecule in solution masks some of these motions. Therefore, we investigate to what extent relaxometry improves timescale resolution, using the “detector” analysis of dynamics. Here, we demonstrate improvements in the characterization of internal dynamics of methyl-bearing side chains by carbon-13 relaxometry in the small protein ubiquitin. We show that relaxometry data leads to better information about nanosecond motions as compared to high-field relaxation data only. Our calculations show that gains from relaxometry are greater with increasing correlation time of rotational diffusion.

Characterization of D.I. Diesel Sprays in High Density Conditions

1996 ◽  
Author(s):  
F. Payri ◽  
J. M. Desantes ◽  
J. Arrégle
Keyword(s):  
High Density ◽  
Diesel Sprays

scholarly journals An Optical Characterization of Atomization in Non-Evaporating Diesel Sprays

2016 ◽  
Author(s):  
R. Lockett ◽  
Mahesh Jeshani ◽  
Kassandra Makri ◽  
Richard Price
Keyword(s):  
Optical Characterization ◽  
Diesel Sprays

Optical Analysis and Simulation of Diesel Sprays in a High Pressure and High Temperature Spray Box

2006 ◽  
Author(s):  
Wolfgang Fimml ◽  
Christian Fuchs ◽  
Thomas Jauk ◽  
Andreas Wimmer
Keyword(s):  
Simulation Models ◽  
Optical Analysis ◽  
Diesel Sprays ◽  
Optical Visualization ◽  
Simulation Based ◽  
Visualization Techniques ◽  
Fuel Consumption And Emissions ◽  
Injection Strategies

The characterization of diesel sprays for the simulation-based optimization of injection strategies and combustion chamber geometries is of particular importance to reach future targets concerning performance, fuel consumption and emissions. The prediction quality of this simulation process depends largely upon the adequate calibration of the spray models used. This paper aims to present the experimental setup of a spray box, the applied optical visualization techniques and the results. Furthermore, it will show the adjustment and the validation of the simulation models based on the experimental analysis.

scholarly journals Diesel Spray Macroscopic Parameter Estimation Using a Synthetic Shapes Database

2019 ◽  
Vol 9 (23) ◽  
pp. 5248
Author(s):  
Bottega ◽  
Dongiovanni
Keyword(s):  
Cone Angle ◽  
Principal Component ◽  
Diesel Sprays ◽  
Image Thresholding ◽  
Traditional Procedure ◽  
Analysis Technique ◽  
Thresholding Algorithm ◽  
Definition Of ◽  
Two Parameters

The paper presents a method for the macroscopic characterization of diesel sprays starting from digital images. Macroscopic spray characterization mainly consists in the definition of two parameters, namely penetration and cone angle. The latter can be evaluated according to many possible definitions, all based on the spray contour that is obtained by means of image thresholding. Therefore, the obtained cone angle value depends on the adopted angle definition and on the used thresholding algorithm. In order to avoid this double dependence, an alternative method has hence been proposed. The algorithm does not require the image thresholding and has an intrinsic cone angle definition. The algorithm takes advantage of principal component analysis technique and allows for a direct estimation of spray penetration and cone angle by comparing the original image with a database made of artificial spray images. In the present work, images coming from two different experiments are analyzed with the proposed method and results are compared with those obtained with a traditional procedure based on the Otsu’s image thresholding and four cone angle definitions.

Experimental Characterization of the Liquid Phase Penetration on Evaporating Diesel Sprays

2005 ◽  
Author(s):  
José M. Desantes ◽  
José M. Pastor ◽  
Simón Martínez ◽  
José M. Riesco
Keyword(s):  
Liquid Phase ◽  
Experimental Characterization ◽  
Diesel Sprays

scholarly journals Characterization of the Long-Range Internal Dynamics of Pyrene-Labeled Macromolecules by Pyrene Excimer Fluorescence

2016 ◽  
Vol 49 (24) ◽  
pp. 9597-9604 ◽  
Author(s):  
Shiva Farhangi ◽  
Remi Casier ◽  
Lu Li ◽  
Janine Lydia Thoma ◽  
Jean Duhamel
Keyword(s):  
Long Range ◽  
Internal Dynamics ◽  
Excimer Fluorescence
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