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3. Numerical and physical modeling of water flow over the ogee weir of the new Niedów barrage

Creator:
Herrera-Granados, Oscar and Kostecki, Stanisław W.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
hydraulic similarity, Ogee weir, discharge coefficient, physical modeling, 2D and 3D numerical modeling, and cofferdam
Language:
Slovak
Description:
In this paper, two- and three-dimensional numerical modeling is applied in order to simulate water flow behavior over the new Niedów barrage in South Poland. The draining capacity of one of the flood alleviation structures (ogee weir) for exploitation and catastrophic conditions was estimated. In addition, the output of the numerical models is compared with experimental data. The experiments demonstrated that the draining capacity of the barrage alleviation scheme is sufficiently designed for catastrophic scenarios if water is flowing under steady flow conditions. Nevertheless, the new cofferdam, which is part of the temporal reconstruction works, is affecting the draining capacity of the whole low-head barrage project.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

4. Synthesis and characterization of a cobalt(II) tetrakis(3-fluorophenyl) porphyrin with a built-in 4-vinylphenyl surface attachment moiety

Creator:
Khusnutdinova, D., Flores, M., Beiler, A. M., and Moore, G. F.
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
fluor, porfyriny, chemie povrchových jevů, fluorine, porphyrins, surface chemistry, artificial photosynthesis, 2, and 581
Language:
Multiple languages
Description:
Metalloporphyrins serve important roles in biology and as components in emerging technological assemblies for energy conversion. In this report, we describe the synthesis and characterization of a novel cobalt(II) 5,10,15,20-tetrakis (3-fluorophenyl)porphyrin bearing a 4-vinylphenyl surface attachment group at a beta position on the macrocycle. Electrochemical measurements show the 3-fluorophenyl groups at the meso positions of the porphyrin perturb the reduction potentials of the complex to more positive values as compared to non-fluorinated analogs, thus allowing access to reduced cobalt porphyrin species at significantly less negative applied bias potentials. The complex, cobalt(II) 5,10,15,20-tetrakis(3-fluorophenyl)-2-(4-vinylphenyl)porphyrin, is abbreviated in this article as Gov-1 in honor of Govindjee for his pioneering investigations in the role of fluorine as a promoter of novel protein-substrate interactions and the inspirational role he continues to have in encouraging young investigators in the areas of natural and artificial photosynthesis., D. Khusnutdinova, M. Flores, A. M. Beiler, G. F. Moore., and Obsahuje bibliografické odkazy
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5. Temperature dependence of phosphoenolpyruvate carboxylase activity in the presence of cosolutes

Creator:
Drilias, P., Gousias, H., Manetas, Y., and Gavalas, N.A.
Format:
print
Type:
model:internalpart and TEXT
Language:
Multiple languages
Description:
nclusion of natural (glycerol, proline) or synthetic (polyethylene glycol) compatible solutes in the assay medium for phosphoenolpyruvate carboxylase (EC 4.1.1.31) activity at low substrate (phosphoenolpyruvate) levels enhanced the enzymic activity throughout the temperature range tested (11-42 °C). This effect was much more pronounced above 30 °C and, therefore, the optimum for activity was shifted from 27-29 °C to 37-39 °C, a temperature more consistent with the prevailing leaf temperatures during the growing season for C4-plants; there was also a better correlation between activity/temperature profile and the net photosynthetic rate of intact leaves of Cynodon dactylon (L.) Pers., at the temperature range tested.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public