Wyniki wyszukiwania - BazTech

1

EMG field analysis in dynamic microscopic/nanoscopic models of matter

Fiala Pavel, Bartušek Karel, Dědková Jarmila, Dohnal Premysl

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

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2019

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T. 9, nr 1

4--10

EN

We discuss a numerical model (macro/micro/nanoscopic) to enable more accurate analysis of electro-hydro-dynamic (EMHD) processes in water at the level of atoms. Dedicated experiments have shown that inserting a relatively homogeneous periodic structure (deionized, degassed, or distilled H2O) in a magnetic field will influence the atomic basis, molecules, and relevant bonds. In this context, the present paper focuses on the designing, analysis, and evaluation of the behavior of an extensive system that represents H2O from the microscopic perspective, and it also outlines the properties and changes of the bonds in the examined water samples. Complementarily, a simple example is used to define the results obtained from analyses of the generated spiral static gradient magnetic and non-stationary gradient electromagnetic fields from the frequency range of f = 1 GHz to 10 GHz.

PL

W artykule przedyskutowano (makro/mikro/nanoskopowy) model numeryczny przeznaczony do dokładniejszej analizy procesów elektrohydrodynamicznych (EMHD) w wodzie na poziomie atomowym. Przeprowadzone w tym celu eksperymenty wykazały, że wprowadzenie względnie jednorodnej struktury okresowej (dejonizowanej, odgazowanej lub destylowanej wody w polu magnetycznym wpłynie na strukturę atomową, molekuły i odpowiednie wiązania. W tym kontekście niniejszy artykuł koncentruje się na projektowaniu, analizie i ocenie zachowania rozległego systemu, który reprezentuje H2O z perspektywy mikroskopowej, a także nakreśla właściwości i zmiany wiązań w badanych próbkach wody. Dodatkowo, zastosowano prosty przykład służy do definiowania uzyskanych wyników na podstawie analizy statycznych, spiralnych statycznych gradientowych i niestacjonarnych gradientowych pól elektromagnetycznych w zakresie częstotliwości od 1 GHz do 10 GHz.

2

Wieloskalowe modelowanie rzeźby terenu. Cz. 2

Kochman M., Olszewski R.

Polski Przegląd Kartograficzny

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2005

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T. 37, nr 4

267-273

PL

W drugiej części artykułu omówiono wybrane koncepcje generalizacji numerycznego modelu rzeźby terenu, ze szczególnym uwzględnieniem metody wagowanej filtracji lokalnej opartej na uogólnieniu linii strukturalnych. Zaproponowano także koncepcję budowy wieloskalowego NMT o strukturze hierarchicznej, umożliwiającą monoskalową reprezentację modelu rzeźby na określonym poziomie uogólnienia.

EN

The concept of hierarchical model of relief is a logical conclusion of the idea of a multi representation topographic database. It permits a combined analysis of all the components of the environment and uncovers new possibilities in preserving the integrity of spatial constraints between the model of terrain and other thematic layers (primarily river network). It is possible due to, among other factors, defining of spatial relations between particular objects and object classes. It also provides a new way of looking at the process of relief generalization understood as an approximation of the relief model preserving topological relations, and not as a simplification of contour lines. The basic feature of the generalization of relief should be the preservation of its structure (morphological skeleton). What seems important for the construction of multi scale DTM is not only a hierarchical approach to relief modelling but also the method of approximation of source data. Simple algorithms of DTM generalization such as the conversion of TIN model into regular GRID structure of certain spatial resolution and the application of global filtration allow for a relatively low reduction of complexity of the source model. The proposed concept of hierarchical model preparation through iterative elimination of points from the data source combines elements of local filtration and heuristic approach. In the conducted research it was assumed, that while building the hierarchical structure of DTM model one should define relief structural lines and assign to them appropriate numeric weights. The analysis bases on the division of source data of the model into structural and mass points. In the process of generalization the points are removed according to the combined evaluation of several criteria: their vertical significance (established locally), their density (horizontal significance), and for structural points also by the weight of structural lines and local curvature of those line (established horizontally as well as vertically). The selection of relevance of particular criteria is fully parameterized, permitting a free assignment of weight factors. Hierarchical (multi scale) model of relief can be adapted to the scale of presentation chosen by the user, while retaining the relief structure relevant for that level of generalization. Suggested algorithms make it possible to preserve significant topological relations between structural elements of relief.

3

Multiscaling analysis of a nonlinear boundary value problem in lubrication theory

Aliu E., Shepherd J. J., Connell H. J.

International Journal of Applied Mechanics and Engineering

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2004

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Vol. 9, no 3

455-470

EN

The method of multiple scales, a long standing alternative to the method of matched expansions, is applied to the nonlinear boundary value problem modelling the operation of a one-dimensional gas lubricated slider bearing, at large values of the bearing number. Approximate expansions for the pressure profile, load bearing capacity and the location of the centre of pressure are obtained, and compared with the results of applying matched expansions and numerical techniques.