A computer simulation study of the effect of molecular mass distribution on mass and momentum transport in molecular liquids

1987 ◽  
Vol 86 (11) ◽  
pp. 6446-6453 ◽  
Author(s):  
D. Brown ◽  
J. H. R. Clarke
Keyword(s):  
Computer Simulation ◽  
Molecular Mass ◽  
Mass Distribution ◽  
Simulation Study ◽  
Molecular Mass Distribution ◽  
Momentum Transport ◽  
Molecular Liquids ◽  
Computer Simulation Study

New approaches for the determination of dextran in the sugar production process

2018 ◽  
pp. 138-146 ◽  
Author(s):  
Karin Abraham ◽  
Eckhard Flöter
Keyword(s):  
Molecular Mass ◽  
Mass Distribution ◽  
Molecular Mass Distribution ◽  
Molecular Size ◽  
Mass Variation ◽  
Negative Effects ◽  
New Approaches ◽  
Precise Knowledge ◽  
Enzyme Application

The presence of polysaccharides in cane and beet raw juices causes several negative effects during the sugar manufacture. These are usually mitigated by enzymatic decomposition of dextrans. Such effects not only depend on the content, but also on the molecular mass distribution. This means that the different dextran fractions specifically affect the process. An accurate process control hence requires the most precise knowledge about the existing content and the molecular mass distribution present. A detailed understanding of the specific processing problems and also a targeted enzyme application hence requires the determination of a total dextran content and also its characterization including the differentiation between the different dextran fractions. An accurate analytical tool which equally satisfies industrial applicability is still lacking. To improve on this situation, two new approaches for the determination of dextran were developed and benchmarked against the commonly used and established Haze Method, which is rather inaccurate and also sensitive to molecular mass variation. The two new approaches are both based on polarimetry. These two methods indicate to be superior over the Haze Method with respect two molecular mass variation and hence enable the determination of a broader molecular size range including also low molecular mass dextrans.

Computer simulation study of self-diffusion in Pd(001) surface

2007 ◽  
Vol 68 (3) ◽  
pp. 389-393 ◽  
Author(s):  
Guo-Xiang Chen ◽  
Jian-Min Zhang ◽  
Ke-Wei Xu ◽  
Vincent Ji
Keyword(s):  
Computer Simulation ◽  
Simulation Study ◽  
Computer Simulation Study ◽  
Self Diffusion
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