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Tytuł:
Application of SEM to Analysis of Permeability Coefficient of Cohesive Soils
Autorzy:
Kozłowski, T.
Kurpias-Warianek, K.
Walaszczyk, Ł.
Tematy:
cohesive soils
permeability coefficient
SEM
NIA
cyclic freezing and thawing
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Powiązania:
https://bibliotekanauki.pl/articles/241142.pdf  Link otwiera się w nowym oknie
Opis:
A series of experiments on samples of five clayey soils gave evidence that cyclic freezing and thawing significantly affects the permeability coefficient. An attempt to analyze these changes on base of the Scanning Electron Microscopy SEM photographs of microstructures has been made. A simplistic equation (Eq. 11) has been drawn, describing the permeability coefficient as a function of hydraulic radius and pore area. An approach to determine the permeability coefficient by Eq. (11) on base of SEM photographs, in which the pores were identified manually, yielded results comparable to the Falling Head Test (FHT). However, since the identification of pores in SEM photographs seems the critical point of the method, the Numerical Image Analysis (NIA) has been applied. The procedure of finding the optimum threshold Topt has been described, based on minimization of the deviation ?ki,j, calculated as the absolute value of the difference kSEM,i,j and kFHT,j, i.e. the permeability coefficients determined by the SEM analysis and FHT, respectively. It has been proved that the optimum threshold values can be described as a function of image parameters, i.e. mean grey level Lmean and standard deviation σ n.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mieć i być – etyka posiadania w nauczaniu społecznym Kościoła
To Have and to Be - the Ethics of Possession in the Social Teaching of the Church
Autorzy:
Łużyński, Wiesław
Tematy:
godność osoby ludzkiej
własność prywatna
dobrodziejstwo dobrobytu
zagroże- nia konsumizmu
wychowanie i samowychowanie
mieć aby bardziej być
Pokaż więcej
Wydawca:
Towarzystwo Naukowe Franciszka Salezego
Powiązania:
https://bibliotekanauki.pl/articles/496764.pdf  Link otwiera się w nowym oknie
Opis:
Possessing consumer goods is inseparably connected with human nature and that is why adequate benefiting from them is an important factor to realize all noble values connected with the category “to be”. Private ownership helps a man be free, responsible for his fate and the prosperity of his family. It helps a man fulfill his life duties, realize his role and position in the society. Therefore a man should “have” so as to “be” more generous, great-hearted, solidary. The disarrangements of consumption in the form of consumptionizm doesn’t help him achieve some goals because it subordinates a man to consumption and makes him the subject of manipulation. There is nothing for it but to educate a man and help him self-educate as a man is the subject of consumption, it is he who decides about its level, quantity and quality. The shaping of responsible and mature humanity, which will not forget about the primacy of ethics over technology, spirit over matter, a man over a good, is the light for a modern man living in the consumer society.
Dostawca treści:
Biblioteka Nauki
Artykuł

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