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Search Results: 1 - 10 of 4802 matches for " Carles Simó "
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Importancia de la participación laboral como determinante del divorcio en Espa a1
Carles Simó,Montse Solsona
Papeles de Geografía , 2003,
Abstract: El potencial de la información retrospectiva recogida en la Encuesta sobre Fecundidad y Familia (1995) nos ha animado a realizar una nueva exploración de la participación laboral como variable explicativa de la propensión a la ruptura de una unión en Espa a de las cohortes de unión de 1966 a 1999. Nuestro propósito es evaluar el poder predictivo relativo de esta variable en un modelo explicativo que incluye tres dimensiones: la socialización de los individuos, las características de la unión y los recursos educativos y profesionales. Los resultados son inequívocos, la participación laboral para las mujeres y la no participación para los hombres, se asocia positivamente con la ruptura de una unión. El efecto neto de esta variable, junto con la condición de ser cohabitante y la de haber crecido en una gran ciudad, presentan un alto poder predictivo en nuestro modelo de regresión exponencial de factores determinantes del divorcio en Espa a.
Rigorous KAM results around arbitrary periodic orbits for Hamiltonian Systems
Tomasz Kapela,Carles Simó
Mathematics , 2011,
Abstract: We set up a methodology for computer assisted proofs of the existence and the KAM stability of an arbitrary periodic orbit for Hamiltonian systems. We give two examples of application for systems with 2 and 3 degrees of freedom. The first example verifies the existence of tiny elliptic islands inside large chaotic domains for a quartic potential. In the 3-body problem we prove the KAM stability of the well-known figure eight orbit and two selected orbits of the so called family of rotating Eights. Some additional theoretical and numerical information is also given for the dynamics of both examples.
Variables Involved in the Discordance between HbA1c and Fructosamine: The Glycation Gap Revisited
Carles Zafon, Andreea Ciudin, Silvia Valladares, Jordi Mesa, Rafael Simó
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0066696
Abstract: Aims Glycation gap (GG) is defined as the difference between the measured level of HbA1c and the level that would be predicted from its regression on the fructosamine level. The aims of the study were: 1) To determine the reproducibility and consistency of GC; 2) To discover factors related to GG value. Given that metformin might increase glucose transport through the erythrocyte membrane, this treatment was also considered in the analyses of the results. Methods GG was calculated in two blood samples separated 30.6 (SD 7.3) weeks, obtained in 508 type 2 diabetic patients. The following variables were considered: HbA1c, fructosamine, glucose, creatinine, hematological parameters and treatment with metformin. Multivariate and logistic regression analyses were performed to explore the variables independently related to CG. Results GG was reproducible and consistent over time. Creatinine, mean corpuscular hemoglobin concentration (MCHC), and glycemia (inverse relationship); and HbA1c and treatment with metformin (direct relationship) were independently related to GG. Patients treated with metformin showed higher HbA1c values, despite similar fructosamine concentrations, than patients not treated with the drug. Conclusions GG is independently related to serum levels of creatinine, MCHC and treatment with metformin. The spurious effect of metformin on Hb glycation could have serious clinical implications and should be considered when interpreting the results of clinical trials.
Stability islands in domains of separatrix crossings in slow-fast Hamiltonian systems
Anatoly Neishtadt,Carles Simó,Dmitri Treschev,Alexei Vasiliev
Physics , 2006,
Abstract: We consider a 2 d.o.f. Hamiltonian system with one degree of freedom corresponding to fast motion and the other corresponding to slow motion. The ratio of the time derivatives of slow and fast variables is of order $0<\eps \ll 1$. At frozen values of the slow variables there is a separatrix on the phase plane of the fast variables and there is a region in the phase space (the domain of separatrix crossings) where the projections of phase points onto the plane of the fast variables repeatedly cross the separatrix in the process of evolution of the slow variables. Under a certain symmetry condition we prove existence of many (of order $1/\eps$) stable periodic trajectories in the domain of the separatrix crossings. Each of these trajectories is surrounded by a stability island whose measure is estimated from below by a value of order $\eps$. Thus, the total measure of the stability islands is estimated from below by a value independent of $\eps$. The proof is based on an analysis of the asymptotic formulas for the corresponding Poincar\'e map.
Nonlinear Principal and Canonical Directions from Continuous Extensions of Multidimensional Scaling  [PDF]
Carles M. Cuadras
Open Journal of Statistics (OJS) , 2014, DOI: 10.4236/ojs.2014.42015

A continuous random variable is expanded as a sum of a sequence of uncorrelated random variables. These variables are principal dimensions in continuous scaling on a distance function, as an extension of classic scaling on a distance matrix. For a particular distance, these dimensions are principal components. Then some properties are studied and an inequality is obtained. Diagonal expansions are considered from the same continuous scaling point of view, by means of the chi-square distance. The geometric dimension of a bivariate distribution is defined and illustrated with copulas. It is shown that the dimension can have the power of continuum.

University Teachers: Coping with Sociocultural Diversity. A Study about Critical Incidents between Hegemonic and Subaltern Cultures  [PDF]
Crista Weise, Carles Monereo
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.96071
Abstract: This article aims to identify and characterise the critical incidents (CI) that occur most frequently at university level in highly diverse sociocultural contexts. Intercultural relations will be analysed within the framework of hegemony and resistance between Western culture, which is inherent to university settings, and the non-Western mixed traits present in the student body. The relationship between different CIs will be examined, as will be the various issues associated with them according to teachers’ perceptions. For this qualitative study, 23 teachers from two Bolivian universities were interviewed. The teachers reported 9 types of CIs linked to sociocultural diversity. The results indicate that CIs are usually the outcome of cultural clashes between the institutional and teachers’ culture and the students’ culture, with the three most frequent CIs related to the use of the vehicular language, expression and communication; different thinking processes and the relationship between students. As a result, we propose a typology and a scheme for classification and interpretation of CIs linked to cultural diversity with the objective of advancing university teacher training.
Legibilidad gramatical de los prospectos de los medicamentos de más consumo y facturación en Espa?a en 2005
Barrio-Cantalejo,Inés Ma; Simón-Lorda,Pablo; March Cerdá,Joan Carles; Prieto Rodríguez,Ma ángeles;
Revista Espa?ola de Salud Pública , 2008, DOI: 10.1590/S1135-57272008000500010
Abstract: background. the manufacturers of medicinal products are responsible for providing consumers proper information on the use of such products. this information is set out in the package leaflets which, according to current legislation, must be easy for patients to read and understand. the purpose of this study is to analyse the linguistic/grammatical readability of the package leaflets of medicinal products through application of the flesch formula. methods. the 30 medicinal products most widely consumed and the 30 which generated the highest expenditure during 2005 in spain were selected. in line with the recommendations of the relevant literature, documents with a flesch index value of ≥ 10 were considered readable. the grammatical readability was calculated by using the flesch index accessible through the microsoft office 2000 programme. results. only 5 documents obtained an acceptable flesch index score (= 10), while 18 scored 0. half of the values were under 2; 25% were 0 and 25% scored 6 or more. conclusions. the data obtained reveal a low level of linguistic and grammatical readability in the package leaflets analysed. the syntax used on drafting the texts tends to use long words.
Swinging Atwood's Machine: Experimental and Theoretical Studies
Olivier Pujol,José-Philippe Pérez,Jean-Pierre Ramis,Carles Simó,Sergi Simon,Jacques-Arthur Weil
Physics , 2009, DOI: 10.1016/j.physd.2010.02.017
Abstract: A Swinging Atwood Machine (SAM) is built and some experimental results concerning its dynamic behaviour are presented. Experiments clearly show that pulleys play a role in the motion of the pendulum, since they can rotate and have non-negligible radii and masses. Equations of motion must therefore take into account the inertial momentum of the pulleys, as well as the winding of the rope around them. Their influence is compared to previous studies. A preliminary discussion of the role of dissipation is included. The theoretical behaviour of the system with pulleys is illustrated numerically, and the relevance of different parameters is highlighted. Finally, the integrability of the dynamic system is studied, the main result being that the Machine with pulleys is non-integrable. The status of the results on integrability of the pulley-less Machine is also recalled.
A Unified Approach for the Multivariate Analysis of Contingency Tables  [PDF]
Carles M. Cuadras, Daniel Cuadras
Open Journal of Statistics (OJS) , 2015, DOI: 10.4236/ojs.2015.53024
Abstract: We present a unified approach to describing and linking several methods for representing categorical data in a contingency table. These methods include: correspondence analysis, Hellinger distance analysis, the log-ratio alternative, which is appropriate for compositional data, and the non-symmetrical correspondence analysis. We also present two solutions working with cummulative frequencies.
Broadband Spectral Amplitude Control in High-Order Harmonic Generation
Carles Serrat
Applied Sciences , 2012, DOI: 10.3390/app2040816
Abstract: A technique for broadband spectral amplitude control of light pulses produced in high-order harmonic generation (HHG) is presented. It has been shown elsewhere that broadband spectral phase control in HHG is achievable using a computerized feedback loop scheme by coherently adding a filtered region of the HHG emission to the intense IR driving pulse with optimal attenuation and time delay parameters. In the present study, further computational evidence of the capabilities of this control scheme is provided by considering the spectral amplitude in a broadband region of the HHG spectrum as the control target for the production of isolated attosecond pulses. Different spectral widths and central photon energies are examined, such as a spectral width of 30 eV centered at 36 eV, well in the plateau, and a width of 20 eV centered at 60 eV in the cutoff region. An iterative procedure of the method is implemented and optimal isolated single cycle pulses at a central photon energy of 36 eV are obtained. This control scheme is a fundamental tool that can be implemented for amplitude and phase shaping of any suitable spectral region in HHG.
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