Wyniki wyszukiwania - Biblioteka Nauki

Ten serwis zostanie wyłączony 2025-02-11.

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 4

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: potencjał przepływu

Sortuj według:

Ogranicz wyniki do:

The meaning of the piezoelectric and streaming potential in bone remodeling

100%

Lech Ł. , Iwaniec M.

Vibrations in Physical Systems

2010

tom Vol. 24

251--258

In this paper authors include the most important information about piezoelectric effect and streaming potential occurring in bone. In their opinion these phenomena play important role during bone remodeling, so that model binding them together was proposed. Model describes mechanisms responsible for “sensing” by osteocyteslocal changes in stresses and strains and for signal transmissions from sensors to effectors i.e. osteoblasts.

W pracy tej zawarto najważniejsze informacje dotyczące występowania efektu piezoelektrycznego oraz potencjału przepływu w strukturach kostnych, które zdaniem autorów tego tekstu, ma odgrywa ważną rolę przy przebudowie tkanki kostnej. Dlatego został zaproponowany model odbierania sygnałów o stanie mechanicznym kości przez osteocyty i powiązany z modelem oddziaływań międzykomórkowych opisującym przekazywanie informacji z osteocytów do osteoblastów.

The use of electrokinetic measurements in a study of pulp wastewater treatment with aluminum and iron (III) salts

100%

Dziejowski J. , Libecki B. , Smoczyński L.

Polish Journal of Chemical Technology

2005

tom Vol. 7, nr 1

13-19

Pulp wastewater poses a serious threat to the natural environment. It is characterized by strong coloration and a high content of organic contaminants, including compounds resistant to biochemical decomposition, often toxic to living organisms. Among a variety of physical and chemical methods of wastewater treatment, coagulation is distinguished by its simplicity and efficiency. The effectiveness of the process depends on the pH and the coagulant dose. The optimization of the process parameters can be done based on electrokinetic measurements, including: potential zeta and the streaming potential. This study examined the process of the coagulation of raw effluents from a sulfate pulp mill with aluminum and iron (III) chlorides. A standard jar test method was used. The color, turbidity, suspension and COD were determined in the samples. Tests with and without pH adjustment were conducted. Electrokinetic measurements were performed with a PCD 03 meter (Mütek Analytic Gmbh). It was found that coagulation effectiveness depended on the salts used. A correlation was also observed between the optimum pH for a determined coagulant dose and the reagent-adding sequence. Iron (III) chloride appeared more effective than aluminum chloride as regards the COD elimination. However, taking the lower optimal dose and a higher pH of coagulation into account, aluminum chloride seems to be a better coagulant for pulp wastewater treatment. The increase in the streaming potential recorded during the tests is correlated with the changes in the wastewater pH. The charge of colloids is dependent upon the pH, so different mechanisms of coagulation can be expected.

Streaming potential – characteristics of dyed cotton fibres

100%

Pielesz A.

Fibres & Textiles in Eastern Europe

2010

tom Vol. 18, no. 2 (79)

103--106

This paper deals with the surface properties of dyed cotton fibres, which were analysed by measuring the streaming potential. Diversified values of the potential were obtained for samples of fabrics dyed with model direct dyes 1-10. Changes in the streaming potential in water solutions of the model dyes were also analysed in order to determine the impact of polar functional groups of the dyes on their anion character. For a broader view of the phenomenon discussed, the analysis of the surface properties of fibres was supplemented with a description of the relative dye content in the fibre, using the K/S ratio.

W niniejszej pracy charakteryzowano powierzchniowe właściwości barwionych włókien bawełny dokonując pomiarów potencjału przepływu. Uzyskano zróżnicowane wartości potencjału przepływu dla próbek tkanin bawełnianych wybarwionych modelowymi barwnikami bezpośrednimi 1-10. Analizowano także zmiany wartości potencjału przepływu w wodnych roztworach modelowych barwników w celu określenia wpływu polarnych grup funkcyjnych barwników na ich anionowy charakter. Dla poszerzenia omawianego zjawiska, poza właściwości powierzchniowe włókien, charakteryzowano także względna zawartość barwników we włóknach, wykorzystując wartości współczynnika K/S.

The impact of the Dirichlet boundary conditions on the convergence of the discretized system of nonlinear equations for potential problems

80%

Kucwaj J.

Computer Assisted Methods in Engineering and Science

2016

tom Vol. 23, no. 1

69--81

The purpose of this paper is the analysis of numerical approaches obtained by describing the Dirichlet boundary conditions on different connected components of the computational domain boundary for potential flow, provided that the domain is a rectangle. The considered problem is a potential flow around an airfoil profile. It is shown that in the case of a rectangular computational domain with two sides perpendicular to the speed direction, the potential function is constant on the connected components of these sides. This allows to state the Dirichlet conditions on the considered parts of the boundary instead of the potential jump on the slice connecting the trail edge with the external boundary. Furthermore, the adaptive remeshing method is applied to the solution of the considered problem.