Sample records for FRACTALES (fractals)
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1

Descripción matemática con dimensiones fractales de células normales y con anormalidades citológicas de cuello uterino/ Mathematical Description with Fractals Dimensions of Normal Cells and Cytological Abnormality's of Uterine Neck

Rodríguez, Javier; Prieto, Signed; Ortiz, Liliana; Wiesner, Carolina; Díaz, Martha; Correa, Catalina
2006-12-01

Resumen en español Introducción. La geometría fractal ha mostrado ser adecuada en la descripción matemática de objetos irregulares; esta medida se ha denominado dimensión fractal. La aplicación del análisis fractal para medir los contornos de las células normales así como aquellas que presentan algún tipo de anormalidad, ha mostrado la posibilidad de caracterización matemática de su irregularidad. Objetivos. Medir, a partir de la geometría fractal células del epitelio escamoso (mas) de cuello uterino clasificadas como normales, atipias escamosas de significado indeterminado (ASC-US) y lesiones intraepiteliales escamosas de bajo grado (LEIBG), diagnosticadas mediante observación microscópica, en busca de mediciones matemáticas que las distingan. Metodología. Este es un estudio exploratorio descriptivo en el que se calcularon las dimensiones fractales, con el método de box counting simplificado y convencional, de los contornos celular y nuclear de 13 células del epitelio escamoso de cuello uterino normales y con anormalidades como ASC-US y lesiones intraepiteliales de bajo grado (LEI BG), a partir de fotografías digitales de 7 células normales, 2 ASCUS y 4 LEI BG diagnosticadas con criterios citomorfológicos mediante observación microscópica convencional. Resultados. Se desarrolló una medida cuantitativa, objetiva y reproducible del grado de irregularidad en las células del epitelio escamoso de cuello uterino identificadas microscópicamente como normales, ASC-US y LEI BG. Conclusiones Se evidenció una organización fractal en la arquitectura celular normal, así como en células ASC-US y las lesiones intraepiteliales de bajo grado (LEI BG). No se encontraron diferencias entre los tipos celulares estudiados. Resumen en inglés Introduction. The fractal geometry has shown to be adapted in the mathematical description of irregular objects; this measurement has denominated fractal dimension. The application of the fractal analysis to measure the contours of the normal cells as well as those that present some type of abnormality, has shown the possibility of mathematical characterization of its irregularity. Objectives. To measure, from the fractal geometry cells of the squamous epithelium of uteri (mas) ne neck classified like normal, atypical squamous cells of undetermined significance (ASC-US) and Low Grade Intraepitelial Lesion (L-SIL), diagnosed by means of microscopic observation, in search of mathematical measurements that distinguish them. Methodology. This is an exploratory descriptive study in which the fractal dimensions were calculated, with the simplified and the conventional box counting method, of the cellular and nuclear contours of 13 normal and with abnormalities cells of the scaly epithelium of uterine neck like ASC-US and L-SIL, from digital photographies of 7 normal cells, 2 ASC-US and 4 L-SIL diagnosed with cytomorphologic criteria by means of microscopic conventional observation. Results. There developed a quantitative, objective and reproducible measurement of the degree of irregularity in the cells of the scaly epithelium of uterine neck identified microscopically like normal, ASCUS y LEI BG. Conclusions an fractal organization was demonstrated in the cellular normal architecture, as well as in cells ASC-US and the injuries intraepiteliales of low degree L-SIL. They did not find differences between the cellular studied types.

Scientific Electronic Library Online (Spanish)

4

Functional, fractal nonlinear response with application to rate processes with memory, allometry, and population genetics

Vlad, Marcel O.; Morán, Federico; Popa, Vlad T.; Szedlacsek, Stefan E.; Ross, John
2007-03-14

Digital.CSIC (Spain)

5

Opening up Fractal Structures of Three Dimensional Flows via Leaking

Tuval, Idan; Schneider, Judit; Piro, Oreste; Tél, T.

DRIVER (Spanish)

6

Opening up Fractal Structures of Three Dimensional Flows via Leaking

Tuval, Idan; Schneider, Judit; Piro, Oreste; Tél, T.
2004-03-01

Digital.CSIC (Spain)

9

The Nature of the Gould Belt from a Fractal Analysis of its Stellar Population

Sánchez, Néstor; Alfaro, Emilio J.; Elías, Federico; Delgado, Antonio J.; Cabrera-Caño, Jesús
2007-09-20

Digital.CSIC (Spain)

10

Los límites del pronóstico newtoniano y la búsqueda del orden en el caos/ The Limits of the Newtonian Forecast and the search of order in the chaos

Sánchez-Santillán, N; Garduño-López, M.R; Ritter-Ortiz, W; Guzmán-Ruiz, S.A
2008-06-01

Resumen en español La mecánica determinista newtoniana sólo puede describir y pronosticar el comportamiento de los sistemas naturales simples y con pocos componentes, aproximadamente el 10% del total de los que conforman la realidad universal conocida hasta ahora; el 90% restante, cuya complejidad y grado de incertidumbre los hace prácticamente inaccesibles a este enfoque, requieren de una nueva visión holística o total, con un acercamiento que incluya conceptos, tanto de la mecánica (mas) clásica de Newton y Descartes, como los emanados de la corriente indeterminista, entre los cuales se encuentran la no linealidad y las secuencias aleatorias, el cálculo de la probabilidad y la estadística, el caos y el orden, la inestabilidad exponencial, la teoría cuántica, los atractores y fractales y la teoría de la información. Resumen en inglés Newtonian deterministic mechanichs can only describe and predict the behavior of simple natural systems with few components, which represent approximately 10% of those conforming the universal reality known until now. The remaining 90%, whose complexity and degree of uncertainty make them practically inaccessible to this approach, require a new holistic or total vision, with an approach that includes concepts of Newton's and Descartes's classical mechanics, as much as tho (mas) se emanated from the indeterministic stream, such as nonlinearity and aleatory sequences, calculus of probability and statistics, chaos and order, exponential instability, quantum Theory, attractors and fractals, and information theory.

Scientific Electronic Library Online (Spanish)

11

Geometría de los sistemas vivos y su importancia en Medicina/ Geometry of living systems and its importance in Medicine

Canals L, Mauricio; Solís, Rigoberto
2005-09-01

Resumen en inglés We analyze the most relevant concepts about complexity of sciences, showing examples and consequences in medical sciences. In the first section we introduce some basic concepts about fractals and its relationship with the geometry of nature and chaos dynamics. We also introduce notions of critic systems, the role of energy in them and we propose a conceptual model for living systems. In this model we identify the non-linear dynamics as the dynamics of the living forms and (mas) fractals as the form resulting from that dynamics. In the second section we review medical and biological examples: infectious diseases, cardiovascular and behavior dynamics, from which useful concepts and medical hypotheses emerge. One of the most important concepts, is the proposition that homeostasis would have an irregular dynamic. Then, we could expect that healthy individuals should be characterized by irregular dynamics, but old or sick individuals would change, probably decreasing the complexity of its dynamics. Therefore, we ask ourselves if the use of therapies to obtain a constant internal medium can be a mistake (Rev Méd Chile 2005; 133: 1097-107)

Scientific Electronic Library Online (Spanish)

12

The spatial distribution of stars

Sánchez, Néstor; Alfaro, Emilio J.
2009-04-01

Digital.CSIC (Spain)

15

SERS en coloides

Sánchez-Cortés, Santiago
2004-04-05

Digital.CSIC (Spain)

17

Quadratic discrete dynamics associated to quadratic maps in the plane

Durán Díaz, Raúl; Hernández Encinas, Luis; Muñoz Masqué, Jaime
2009-01-01

Digital.CSIC (Spain)

19

Propiedades de la superficie de una pizarra empleada como carga en materiales compuestos

Rubio Alonso, Fausto; Rubio Alonso, Juan; Rodríguez González, Mª Ángeles; Liso, María J.
1998-02-01

Digital.CSIC (Spain)

21

On periodic and chaotic regions in the Mandelbrot set

Pastor, Gerardo; Romera, Miguel; Álvarez Marañón, Gonzalo; Arroyo, David; Montoya Vitini, Fausto

11 pages, 5 figures.-- Available online Dec 20, 2005. | We show here in a graphic and simple way the relation between the periodic and chaotic regions in the Mandelbrot set. Since the relation between the periodic and chaotic regions in a one-dimensional (1D) quadratic set is already well known, we ...

DRIVER (Spanish)

22

On periodic and chaotic regions in the Mandelbrot set

Pastor, Gerardo; Romera, Miguel; Álvarez Marañón, Gonzalo; Arroyo Guardeño, David; Montoya Vitini, Fausto
2007-04-01

Digital.CSIC (Spain)

25

Non-linear processes in seagrass-colonization explained by simple clonal growth rules

Sintes, Tomàs; Marbà, Núria; Duarte, Carlos M.; Kendrick, Gary A.
2005-01-01

Digital.CSIC (Spain)

27

How to work with one-dimensional quadratic maps

Pastor, Gerardo; Romera, Miguel; Álvarez Marañón, Gonzalo; Montoya Vitini, Fausto

17 pages, 7 figures.-- Printed version published on Dec 2003. | We analyse some identifiers which can univocally identify hyperbolic components and Misiurewicz points of one-dimensional quadratic maps. After seeing the equivalence among the different identifiers and how to go from one to another, we...

DRIVER (Spanish)

28

How to work with one-dimensional quadratic maps

Pastor, Gerardo; Romera, Miguel; Álvarez Marañón, Gonzalo; Montoya Vitini, Fausto
2003-03-28

Digital.CSIC (Spain)

29

Gas separation of 6FDA–6FpDA membranes: Effect of the solvent on polymer surfaces and permselectivity

Recio, Roberto; Lozano, Ángel E.; Marcos-Fernández, Ángel; Campa, José G. de la; Abajo González, Javier de
2007-04-20

Digital.CSIC (Spain)

31

Experimental study of the structural and magnetic properties of -Fe2O3 nanoparticles

Yusuf, S. M.; Teresa, José María de; Mukadam, M. D.; Kohlbrecher, J.; Ibarra, M. Ricardo; Arbiol, J.; Sharma, P.; Kulshreshtha, S. K.
2006-11-01

Digital.CSIC (Spain)

32

Empirical evidences of a common multifractal signature in economic, biological and physical systems

Pont, Oriol; Turiel, Antonio; Pérez-Vicente, Conrad J.

11 pages, 5 figures, 3 tables, 1 appendix.-- PACS nrs.: 47.53.+n; 89.75.Da; 47.11.+j.-- Printed version published May 15, 2009.-- Full-text version available Open Access at: http://www.icm.csic.es/files/oce/almacen/papers/AR-2009-05.pdf | Recent developments in microcanonical multifractal formalism ...

DRIVER (Spanish)

34

Effective dimensions and percolation in hierarchicaly structured scale-free networks

Eguíluz, Víctor M.; Hernández-García, Emilio; Piro, Oreste; Klemm, Konstantin
2003-11-24

Digital.CSIC (Spain)

35

Comunidades de afectados, procomún y don expandido

Lafuente, Antonio; Corsín-Jiménez, Alberto
2010-12-07

Digital.CSIC (Spain)

37

Breaking projective chaos synchronization secure communication using filtering and generalized synchronization

Álvarez Marañón, Gonzalo; Li, Shujun; Montoya Vitini, Fausto; Pastor, Gerardo; Romera, Miguel

DRIVER (Spanish)

38

Breaking projective chaos synchronization secure communication using filtering and generalized synchronization

Álvarez Marañón, Gonzalo; Li, Shujun; Montoya Vitini, Fausto; Pastor, Gerardo; Romera, Miguel
2005-05-01

Digital.CSIC (Spain)

39

Application of the microcanonical multifractal formalism to monofractal systems

Pont, Oriol; Turiel, Antonio; Pérez-Vicente, Conrad J.
2006-12-01

Digital.CSIC (Spain)

40

Analysis of ocean turbulence using adaptive CVE on altimetry maps

Nieves, Verònica; Turiel, Antonio

13 pages, 6 figures, 1 table.-- PACS nrs.: 92.10.Lq; 67.40.Vs; 47.27.E-; 47.53.+n.-- Available online Dec 31, 2008.-- Issue title: "Special issue on marine turbulence".-- Full-text version available Open Access at: http://www.icm.csic.es/files/oce/almacen/papers/doc_660.pdf | It has been often argue...

DRIVER (Spanish)

42

Algorithm for external argument calculation of the nodes of a shrub in the Mandelbrot set

Pastor, Gerardo; Romera, Miguel; Álvarez Marañón, Gonzalo; Arroyo, David; Orúe, Amalia B.; Fernández Mármol, Verónica

10 pages, 4 figures. | Misiurewicz points are essential points of the Mandelbrot set. External arguments are the most useful tool in order to analyze these points; therefore, it is important to go deeper in the study of the external arguments' calculation of these points. In this paper we introduce ...

DRIVER (Spanish)

43

Algorithm for external argument calculation of the nodes of a shrub in the Mandelbrot set

Pastor, Gerardo; Romera, Miguel; Álvarez Marañón, Gonzalo; Arroyo Guardeño, David; Orúe, Amalia B.; Fernández Mármol, Verónica; Montoya Vitini, Fausto
2008-06-01

Digital.CSIC (Spain)