Corrigendum to “Experimental and numerical study of the role of NCN in the prompt-NO formation in low pressure CH4/O2/N2 and C2H2/O2/N2 flames” [Combust. Flame 157 (2010) 1929–1941]

2013 ◽  
Vol 160 (3) ◽  
pp. 745-746 ◽  
Author(s):  
Nathalie Lamoureux ◽  
Pascale Desgroux ◽  
Abderrahman El Bakali ◽  
Jean-François Pauwels
Keyword(s):  
Numerical Study ◽  
Low Pressure ◽  
No Formation

Experimental and numerical study of the role of NCN in prompt-NO formation in low-pressure CH4–O2–N2 and C2H2–O2–N2 flames

2010 ◽  
Vol 157 (10) ◽  
pp. 1929-1941 ◽  
Author(s):  
N. Lamoureux ◽  
P. Desgroux ◽  
A. El Bakali ◽  
J.F. Pauwels
Keyword(s):  
Numerical Study ◽  
Low Pressure ◽  
No Formation

Numerical study of CO2 injection and the role of viscous crossflow in near-miscible CO2-WAG

2020 ◽  
Vol 74 ◽  
pp. 103112 ◽  
Author(s):  
Gang Wang ◽  
Gillian Pickup ◽  
Kenneth Sorbie ◽  
Eric Mackay ◽  
Arne Skauge
Keyword(s):  
Numerical Study ◽  
Co2 Injection

Some results of numerical study on the role of tribofilms formed during automotive braking

2014 ◽  
Author(s):  
Andrey I. Dmitriev ◽  
Heinz Kloß ◽  
Werner Österle
Keyword(s):  
Numerical Study

scholarly journals Enzymatic synthesis and phosphorolysis of 4(2)-thioxo- and 6(5)-azapyrimidine nucleosides by E. coli nucleoside phosphorylases

2016 ◽  
Vol 12 ◽  
pp. 2588-2601 ◽  
Author(s):  
Vladimir A Stepchenko ◽  
Anatoly I Miroshnikov ◽  
Frank Seela ◽  
Igor A Mikhailopulo
Keyword(s):  
Purine Nucleoside Phosphorylase ◽  
Reaction Conditions ◽  
E Coli ◽  
No Formation ◽  
Structural Peculiarities ◽  
Substrate Properties ◽  
Nucleoside Phosphorylases ◽  
Derivatives Of

The trans-2-deoxyribosylation of 4-thiouracil (4SUra) and 2-thiouracil (2SUra), as well as 6-azauracil, 6-azathymine and 6-aza-2-thiothymine was studied using dG and E. coli purine nucleoside phosphorylase (PNP) for the in situ generation of 2-deoxy-α-D-ribofuranose-1-phosphate (dRib-1P) followed by its coupling with the bases catalyzed by either E. coli thymidine (TP) or uridine (UP) phosphorylases. 4SUra revealed satisfactory substrate activity for UP and, unexpectedly, complete inertness for TP; no formation of 2’-deoxy-2-thiouridine (2SUd) was observed under analogous reaction conditions in the presence of UP and TP. On the contrary, 2SU, 2SUd, 4STd and 2STd are good substrates for both UP and TP; moreover, 2SU, 4STd and 2’-deoxy-5-azacytidine (Decitabine) are substrates for PNP and the phosphorolysis of the latter is reversible. Condensation of 2SUra and 5-azacytosine with dRib-1P (Ba salt) catalyzed by the accordant UP and PNP in Tris∙HCl buffer gave 2SUd and 2’-deoxy-5-azacytidine in 27% and 15% yields, respectively. 6-Azauracil and 6-azathymine showed good substrate properties for both TP and UP, whereas only TP recognizes 2-thio-6-azathymine as a substrate. 5-Phenyl and 5-tert-butyl derivatives of 6-azauracil and its 2-thioxo derivative were tested as substrates for UP and TP, and only 5-phenyl- and 5-tert-butyl-6-azauracils displayed very low substrate activity. The role of structural peculiarities and electronic properties in the substrate recognition by E. coli nucleoside phosphorylases is discussed.

Biofouling by ultra-low pressure filtration of surface water: The paramount role of initial available biopolymers

2021 ◽  
Vol 640 ◽  
pp. 119740
Author(s):  
Li Zhang ◽  
Nigel Graham ◽  
Nicolas Derlon ◽  
Youneng Tang ◽  
Muhammad Saboor Siddique ◽  
...  
Keyword(s):  
Surface Water ◽  
Low Pressure ◽  
Pressure Filtration

The role of H2O in NO formation and reduction during oxy-steam combustion of bituminous coal char

2022 ◽  
Vol 237 ◽  
pp. 111883
Author(s):  
Shuang Yue ◽  
Chunbo Wang ◽  
Ziyang Xu ◽  
Dong Wang ◽  
Fei Zheng ◽  
...  
Keyword(s):  
Bituminous Coal ◽  
Coal Char ◽  
No Formation

Detailed Numerical Study of the Main Sources of Loss and Flow Behavior in Low Pressure Steam Turbine Exhaust Hoods

2017 ◽  
Author(s):  
Dickson Munyoki ◽  
Markus Schatz ◽  
Damian M. Vogt
Keyword(s):  
Steam Turbine ◽  
Numerical Study ◽  
Flow Behavior ◽  
Low Pressure ◽  
Operating Conditions ◽  
Pressure Recovery ◽  
Exhaust Hood ◽  
Recovery Coefficient ◽  
Pressure Steam ◽  
Underlying Mechanisms

The performance of the axial-radial diffuser downstream of the last low-pressure steam turbine stages and the losses occurring subsequently within the exhaust hood directly influences the overall efficiency of a steam power plant. It is estimated that an improvement of the pressure recovery in the diffuser and exhaust hood by 10% translates into 1% of last stage efficiency [11]. While the design of axial-radial diffusers has been the object of quite many studies, the flow phenomena occurring within the exhaust hood have not received much attention in recent years. However, major losses occur due to dissipation within vortices and inability of the hood to properly diffuse the flow. Flow turning from radial to downward flow towards the condenser, especially at the upper part of the hood is essentially the main cause for this. This paper presents a detailed analysis of the losses within the exhaust hood flow for two operating conditions based on numerical results. In order to identify the underlying mechanisms and the locations where dissipation mainly occurs, an approach was followed, whereby the diffuser inflow is divided into different sectors and pressure recovery, dissipation and finally residual kinetic energy of the flow originating from these sectors is calculated at different locations within the hood. Based on this method, the flow from the topmost sectors at the diffuser inlet is found to cause the highest dissipation for both investigated cases. Upon hitting the exhaust hood walls, the flow on the upper part of the diffuser is deflected, forming complex vortices which are stretching into the condenser and interacting with flow originating from other sectors, thereby causing further swirling and generating additional losses. The detailed study of the flow behavior in the exhaust hood and the associated dissipation presents an opportunity for future investigations of efficient geometrical features to be introduced within the hood to improve the flow and hence the overall pressure recovery coefficient.

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