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Search Results: 1 - 10 of 442309 matches for " Mélany Castillo Suárez "
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Sexual relations prevalence among adolescents in one school in Bucaramanga city
Mélany Castillo Suárez,Mariluz Meneses Moreno,José leonardo Silva Durán,Paola Andrea Navarrete Hernández
MedUNAB , 2003,
Abstract:
On Lindenstrauss-Pe?czyński spaces
Jesús M. F. Castillo,Yolanda Moreno,Jesús Suárez
Mathematics , 2005,
Abstract: In this work we shall be concerned with some stability aspects of the classical problem of extension of $C(K)$-valued operators. We introduce the class $\mathscr{LP}$ of Banach spaces of Lindenstrauss-Pe{\l}czy\'{n}ski type as those such that every operator from a subspace of $c_0$ into them can be extended to $c_0$. We show that all $\mathscr{LP}$-spaces are of type $\mathcal L_\infty$ but not the converse. Moreover, $\mathcal L_\infty$-spaces will be characterized as those spaces $E$ such that $E$-valued operators from $w^*(l_1,c_0)$-closed subspaces of $l_1$ extend to $l_1$. Complemented subspaces of $C(K)$ and separably injective spaces are subclasses of $\mathscr{LP}$-spaces and we show that the former does not contain the latter. It is established that $\mathcal L_\infty$-spaces not containing $l_1$ are quotients of $\mathscr{LP}$-spaces, while $\mathcal L_\infty$-spaces not containing $c_0$, quotients of an $\mathscr{LP}$-space by a separably injective space and twisted sums of $\mathscr{LP}$-spaces are $\mathscr{LP}$-spaces.
Twisting non-commutative $L_p$ spaces
Félix Cabello Sánchez,Jesús M. F. Castillo,Stanislaw Goldstein,Jesús Suárez
Mathematics , 2014,
Abstract: The paper makes the first steps into the study of extensions ("twisted sums") of noncommutative $L^p$-spaces regarded as Banach modules over the underlying von Neumann algebra $\mathcal M$. Our approach combines Kalton's description of extensions by centralizers (these are certain maps which are, in general, neither linear nor bounded) with a general principle, due to Rochberg and Weiss saying that whenever one finds a given Banach space $Y$ as an intermediate space in a (complex) interpolation scale, one automatically gets a self-extension $ 0\longrightarrow Y\longrightarrow X\longrightarrow Y \longrightarrow 0. $ For semifinite algebras, considering $L^p=L^p(\mathcal M,\tau)$ as an interpolation space between $\mathcal M$ and its predual $\mathcal M_*$ one arrives at a certain self-extension of $L^p$ that is a kind of noncommutative Kalton-Peck space and carries a natural bimodule structure. Some interesting properties of these spaces are presented. For general algebras, including those of type III, the interpolation mechanism produces two (rather than one) extensions of one sided modules, one of left-modules and the other of right-modules. Whether or not one can find (nontrivial) self-extensions of bimodules in all cases is left open.
Extension and lifting of operators and polynomials
Jesús M. F. Castillo,Ricardo García,Jesús Suárez
Mathematics , 2011,
Abstract: We study the problem of extension and lifting of operators belonging to certain operator ideals, as well as that of their associated polynomials and holomorphic functions. Our results provide a characterization of $\mathcal{L}_1$ and $\mathcal{L}_{\infty}$-spaces that includes and extends those of Lindenstrauss-Rosenthal \cite{LR} using compact operators and Gonz\'{a}lez-Guti\'{e}rrez \cite{GG} using compact polynomials. We display several examples to show the difference between extending and lifting compact (resp. weakly compact, unconditionally convergent, separable and Rosenthal) operators to operators of the same type. Finally, we show the previous results in a homological perspective, which helps the interested reader to understand the motivations and nature of the results presented.
Prevalencia de obesidad en un círculo infantil Obesity prevalence in a nursery
Niurelkis Suárez Castillo,Alina Guerrero Ramírez,Kenia M Rodríguez Oropesa,Concepción Flores Martínez
Revista Cubana de Pediatr?-a , 2010,
Abstract: INTRODUCCIóN. En la actualidad el incremento de la obesidad infantil es considerable y la detección precoz de estos problemas es crucial para la prevención de la morbilidad y mortalidad de la población adulta. Este trabajo se realizó con el propósito de caracterizar el estado nutricional de los ni os del círculo infantil Amiguitos del Caribe , en Ciudad de La Habana. MéTODOS. Durante el mes de marzo de 2008 se estudiaron 99 ni os (48 del sexo femenino y 51 del masculino) con edades entre 1 y 6 a os, residentes en la localidad Antonio Guiteras, del municipio La Habana del Este. Se realizó un estudio observacional, de corte transversal, en el que se analizaron variables como el peso y la talla, y otras como edad, sexo, color de la piel, antecedentes personales de obesidad en el momento de ingreso al círculo infantil, antecedentes familiares de obesidad (padres y abuelos), tiempo de lactancia materna y comienzo de la ablactación. Se utilizaron las tablas cubanas de peso (en kg) para la talla en varones y hembras, para definir el estado actual de nutrición. RESULTADOS. Se realizó la medición antropométrica y, según los resultados encontrados, se observó una tendencia al aumento de ni os con sobrepeso y de obesos, con una prevalencia del 22,2 % y 16 %, respectivamente. Se asociaron con mayor frecuencia a esta malnutrición los antecedentes familiares de obesidad y el tiempo de lactancia materna menor de 4 meses. Esta relación fue significativa. CONCLUSIONES. Se considera que sería oportuno extender el estudio a todos los círculos infantiles del municipio y realizar investigaciones posteriores, donde se tengan en cuenta las variables: actividad física y conducta alimentaria. INTRODUCTION. At the present times the infantile obesity increase is significant and the early detection of these problems is crucial to prevention of morbidity and mortality of adult population. The aim of present paper was to characterize the nutritional state of children from the "Amiguitos del Caribe" Nursery in Ciudad de La Habana. METHODS. In March, 2008 were studied (48 of female sex and 51 of male sex) aged between 1 and 6, resident of the Antonio Guiteras parceling from Habana del Este municipality. An observational and cross-sectional study was conducted to analyze different variables including weight and height, age, sex, skin color, personal obesity backgrounds at admission to nursery, family obesity backgrounds (parents and grandparents), length of breastfeeding and onset of ablactation. We used the Cuban weight tables (kg) for the height of boys and girls and to define the p
Local complementation and the extension of bilinear mappings
J. M. F. Castillo,A. Defant,R. García,D. Pérez-García,J. Suárez
Mathematics , 2011, DOI: 10.1017/S0305004111000533
Abstract: We study different aspects of the connections between local theory of Banach spaces and the problem of the extension of bilinear forms from subspaces of Banach spaces. Among other results, we prove that if $X$ is not a Hilbert space then one may find a subspace of $X$ for which there is no Aron-Berner extension. We also obtain that the extension of bilinear forms from all the subspaces of a given $X$ forces such $X$ to contain no uniform copies of $\ell_p^n$ for $p\in[1,2)$. In particular, $X$ must have type $2-\epsilon$ for every $\epsilon>0$. Also, we show that the bilinear version of the Lindenstrauss-Pe{\l}czy\'nski and Johnson-Zippin theorems fail. We will then consider the notion of locally $\alpha$-complemented subspace for a reasonable tensor norm $\alpha$, and study the connections between $\alpha$-local complementation and the extendability of $\alpha^*$ -integral operators.
FACTORES DETERMINANTES DE SOBREPESO Y OBESIDAD EN INFANTES DE UN CíRCULO INFANTIL / Determinants of overweight and obesity in infants of a day nursery
Niurelkis Suárez Castillo,Ela M. Céspedes Miranda,Bethania K. Cabrera Hernández,Kenia M Rodríguez Oropesa
CorSalud , 2012,
Abstract: ResumenIntroducción y objetivos: El incremento de la obesidad infantil es alarmante. Su persistencia en la adultez es causa de una alta tasa de morbilidad y mortalidad por enfermedades cardiovasculares. Esta investigación se realizó con el propósito de detectar tempranamente los ni os sobrepeso y obesos del Círculo Infantil Volodia, de Arroyo Naranjo en La Habana, Cuba; así como para identificar algunos factores de riesgo asociados. Método: Se estudiaron 122 infantes de ambos sexos (59 ni as y 63 ni os), cuyas edades oscilaban entre 1 y 5 a os. Se determinó la asociación de la obesidad con otros factores de riesgo, como el peso al nacer, el sexo, los antecedentes familiares, los hábitos dietéticos y la actividad física. Resultados: La prevalencia de sobrepeso y obesidad fue de 9,0 % y 7,4 %, respectivamente; existió asociación estadística significativa entre la obesidad y las variables: antecedentes familiares de obesidad (X2= 5,690, p = 0.017), circunferencia abdominal mayor del 97 percentil (X2= 5,690, p = 0.017), y la presencia de bajo peso o macrofeto al nacer (X2= 6,348, p = 0.042). Conclusiones: Existe una tendencia al sobrepeso y obesidad en estos ni os. En los obesos predominaron los antecedentes familiares, la circunferencia abdominal mayor del 97 percentil, y la presencia de bajo peso o macrofeto al nacer. Hubo una tendencia a presentar una dieta sin límites y poca actividad física. / AbstractIntroduction and Objectives: The increase of obesity during childhood is alarming. Its persistence in adulthood causes a high rate of morbidity and mortality due to cardiovascular diseases. The aim of this research was to early detect overweight and obese children at the Volodia day-nursery, from Arroyo Naranjo in Havana, Cuba; and to identify some associated risk factors. Method: 122 infants aged between 1 and 5 years, of both sexes (59 girls and 63 boys) were studied. The association of obesity with other risk factors such as birth weight, sex, family history, dietary habits and physical activity was determined. Results: The prevalence of overweight and obesity was 9.0% and 7.4% respectively, there was a statistically significant association between obesity and several variables such as family history of obesity (X2=5.690, p=0.017), waist circumference greater than 97 percentile (X2=5.690, p=0.017), and the presence of low weight or overweight at birth (X2=6.348, p=0.042). Conclusions: There is a tendency to overweight and obesity in these children. In the obese the following factors predominated: family history, waist circumference greater than 97 perc
Design of an optimal control for an autonomous mobile robot
Gutiérrez-Arias, E.M.;Flores-Mena, J.E.;Morin-Castillo, M.M.;Suárez-Ramírez, H;
Revista mexicana de física , 2011,
Abstract: in this article, we present an autonomous mobile robot that is provided with two active wheels and passive one, as well as two control algorithms for the stabilization of the programmed paths. the dynamic programming constitute the bases for the determination of both control laws. the first law of optimal control is obtained by solving the ricatti matricial differential equation. the second is deduced taking into account the work done by kalman, which makes possible the reduction of a matricial differential equation into an algebraic matricial equation. the simulation of both algorithms is made when the programmed path is a straight line and this makes possible to observe the optimal control law, which represents the principal goal of this paper, and which presents an improved quality for the stabilization that the control law obtained following the work of kalman.
Prevalencia de obesidad en un círculo infantil
Suárez Castillo,Niurelkis; Guerrero Ramírez,Alina; Rodríguez Oropesa,Kenia M; Flores Martínez,Concepción; Tadeo Oropesa,Ionmara;
Revista Cubana de Pediatr?-a , 2010,
Abstract: introduction. at the present times the infantile obesity increase is significant and the early detection of these problems is crucial to prevention of morbidity and mortality of adult population. the aim of present paper was to characterize the nutritional state of children from the "amiguitos del caribe" nursery in ciudad de la habana. methods. in march, 2008 were studied (48 of female sex and 51 of male sex) aged between 1 and 6, resident of the antonio guiteras parceling from habana del este municipality. an observational and cross-sectional study was conducted to analyze different variables including weight and height, age, sex, skin color, personal obesity backgrounds at admission to nursery, family obesity backgrounds (parents and grandparents), length of breastfeeding and onset of ablactation. we used the cuban weight tables (kg) for the height of boys and girls and to define the present state of nutrition. results. a anthropometric measurement and according the results there was a trend to increase in children with excess weight and obese and a prevalence of 22,2% and 16%, respectively. the family backgrounds of obesity and the length of breast feeding less than 4 months were associated with this malnutrition. this relation was significant. conclusions. we think that will be appropriate to extend the study to all the nurseries of this municipality and also to carry out subsequent researches taking into account the following variables: physical activity and food behavior.
Derecho a la rectificación, responsabilidad jurídica y géneros de opinión
Germán Suárez Castillo
Palabra Clave , 2007,
Abstract: Desde la vigencia de la Constitución de 1991, el derecho a la rectificación adquirió carácter fundamental, y actualmente es ejercido contra los medios de comunicación, especialmente a través de la acción de tutela, por quienes resultan afectados con sus publicaciones. A pesar de que la doctrina y la jurisprudencia coinciden en que dicho mecanismo solamente es aplicable frente al periodismo informativo, la práctica judicial tiene una percepción distinta y admite excepcionalmente su procedencia frente a los géneros de opinión, al punto que las columnas de opinión, los editoriales y hasta las caricaturas son objeto de acciones judiciales especiales y ordinarias para la rectificación y la responsabilidad jurídica que corresponde cuando causan da o a derechos de terceros.
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