Emparejamiento de patrones en medallones de espiral múltiple

Congreso NoLineal 2008, Barcelona 16 al 19 de Junio de 2008. Actas Nolineal 2008, Editado por F.Marques y A. Delshams, ISBN: 978-84-96736-48-1, (2008) 192Peer reviewe

The effects of varying protein and energy intakes on the growth and body composition of very low birth weight infants

<p>Abstract</p> <p>Objective</p> <p>To determine the effects of high dietary protein and energy intake on the growth and body composition of very low birth weight (VLBW) infants.</p> <p>Study design</p> <p>Thirty-eight VLBW infants whose weights were appropriate for their gestational ages were assessed for when they could tolerate oral intake for all their nutritional needs. Thirty-two infants were included in a longitudinal, randomized clinical trial over an approximate 28-day period. One control diet (standard preterm formula, group A, n = 8, 3.7 g/kg/d of protein and 129 kcal/kg/d) and two high-energy and high-protein diets (group B, n = 12, 4.2 g/kg/d and 150 kcal/kg/d; group C, n = 12, 4.7 g/kg/d and 150 kcal/kg/d) were compared. Differences among groups in anthropometry and body composition (measured with bioelectrical impedance analysis) were determined. An enriched breast milk group (n = 6) served as a descriptive reference group.</p> <p>Results</p> <p>Groups B and C displayed greater weight gains and higher increases in fat-free mass than group A.</p> <p>Conclusion</p> <p>An intake of 150 kcal/kg/d of energy and 4.2 g/kg/d of protein increases fat-free mass accretion in VLBW infants.</p

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Cryptanalytic methods in chaotic cryptosystems

6 pages, 6 figures.-- Communication presented at the 5th World Multiconference on Systemics, Cybernetics and Informatics and 7th International Conference on Information System Analysis and Synthesis (SCI/ISAS 2001, Orlando, Florida, Jul 22-25, 2001).In recent years, telecommunications networks have undergone an explosive growth. As a consequence, there has been a strong demand of information protection mechanisms. Many cryptosystems based on chaos have been proposed, although little or no critical analysis has been made about the security and cryptographic robustness of these algorithms. In this paper we present our tools to examine some of these algorithms from a cryptographic perspective, showing many vulnerabilities that can be exploited to successfully break them. We conclude that most of the chaotic cryptosystems are very insecure and cumbersome, thus, unreliable and impractical for real applications.Peer reviewe

External arguments for the chaotic bands calculation in the Mandelbrot set

14 pages, 8 figures.-- PACS nrs.: 05.45.+b, 47.20.Ky.-- Printed version published on Aug 1, 2005.In this paper we study the chaotic bands of any Mandelbrot set hyperbolic component. We use external arguments in order to identify the hyperbolic components. If we use harmonics as a tool, we can directly calculate the chaotic bands. Indeed, as we clearly show here, the harmonics of the external arguments of a given hyperbolic component (gene) are the external arguments of the last appearance hyperbolic components of the chaotic bands corresponding to the gene. Likewise, we explain some differences in the chaotic region of cardioids and discs.This work was supported by Ministerio de Educación y Ciencia of Spain, research grant SEG2004-02418.Peer reviewe

Shrubs in the Mandelbrot set ordering

22 pages, 9 figures.We introduce shrubs in this paper in order to present a first approach to studying the structure of the Mandelbrot set. Primary, secondary... and N-ary shrubs are analyzed. We have experimentally obtained formulae to calculate the periods of the hyperbolic component representatives of the structural branches, and the preperiods and periods of both the nodes -where structural branches emanate- and the tips -where the shrub enters in crisis. A generalization allows us to give in each case one formula to calculate representative periods and preperiods and periods of nodes and tips.This work was supported by Ministerio de Ciencia y Tecnología of Spain, research grant TIC2001-0586.Peer reviewe

Operating with external arguments in the Mandelbrot set antenna

20 pages, 7 figures.-- PACS nrs.: 05.45.Ac; 47.20.Ky.-- Printed version published on Oct 2002.The external argument theory of Douady and Hubbard allows us to know both the potential and the field-lines in the exterior of the Mandelbrot set. Nonetheless, there are no explicit formulae to operate with external arguments, and the external argument theory is difficult to apply. In this paper we introduce some tools in order to obtain formulae to operate with external arguments in the Mandelbrot set antenna. Thus, we introduce the harmonic tool to calculate both the external arguments of the period-doubling cascade hyperbolic components and the external arguments of the last appearance hyperbolic components. Likewise, we introduce composition rules applied to external arguments that, with the aid of the concept of heredity, allows the calculation of all the external arguments that constitutes the family tree of a given external argument.This work was supported by Ministerio de Ciencia y Tecnología of Spain, research grant TIC2001-0586.Peer reviewe

Equivalence between subshrubs and chaotic bands in the Mandelbrot set

25 pages, 7 figures.-- This is an open access article distributed under the Creative Commons Attribution License.We study in depth the equivalence between subshrubs and chaotic bands in the Mandelbrot set. In order to do so, we introduce the rules for chaotic bands and the rules for subshrubs, as well as the transformation rules that allow us to interchange them. From all the denominations of a chaotic band, we show the canonical form; that is, the one associated to the hyperbolic component that generates such a chaotic band. Starting from the study of the one-dimensional route, we fulfil an inductive study that gives a generalization of the shrub concept.This work was supported by "Ministerio de Educación y Ciencia" of Spain, Research Grant SEG2004-02418.Peer reviewe

Operating with External Arguments of Douady and Hubbard

17 pages, 6 figures.-- This is an open access article distributed under the Creative Commons Attribution License.The external arguments of the external rays theory of Douady and Hubbard is a valuable tool in order to analyze the Mandelbrot set, a typical case of discrete dynamical system used to study nonlinear phenomena. We suggest here a general method for the calculation of the external arguments of external rays landing at the hyperbolic components root points of the Mandelbrot set. Likewise, we present a general method for the calculation of the external arguments of external rays landing at Misiurewicz points.This work was supported by the MEC, Spain, research Grant SEG 2004-02418.Peer reviewe

Conjuntos de Julia alternados

Congreso Nolineal 2008 Barcelona 16 al 19 de Junio de 2008. Actas Nolineal 2008, Editado por F.Marques y A. Delshams, ISBN: 978-84-96736-48-1, (2008) 198Peer reviewe