La clientela en la época de los flavios según el testimonio de Marcial

Fil: Cecco, EIda E.. Universidad Nacional de Cuyo. Facultad de Filosofía y LetrasFil: Mansilla, Angélica M.. Universidad Nacional de Cuyo. Facultad de Filosofía y Letra

Millikelvin magnetic relaxation measurements of alpha-Fe2O3 antiferromagnetic particles

In this paper we report magnetic relaxation data for antiferromagnetic alpha-Fe2O3 particles of 5 nm mean diameter in the temperature range 0.1 K to 25 K. The average spin value of these particles S=124 and the uniaxial anisotropy constant D=1.6x10^-2 K have been estimated from the experimental values of the blocking temperature and anisotropy field. The observed plateau in the magnetic viscosity from 3 K down to 100 mK agrees with the occurrence of spin tunneling from the ground state Sz = S. However, the scaling M vs Tln(nu t) is broken below 5 K, suggesting the occurrence of tunneling from excited states below this temperature.Comment: 4 pages (two columns), 4 figure

Correlation between magnetic interactions and domain structure in A1 FePt ferromagnetic thin films

We have investigated the relationship between the domain structure and the magnetic interactions in a series of FePt ferromagnetic thin films of varying thickness. As-made films grow in the magnetically soft and chemically disordered A1 phase that may have two distinct domain structures. Above a critical thickness $d_{cr}\sim 30$ nm the presence of an out of plane anisotropy induces the formation of stripes, while for $d<d_{cr}$ planar domains occur. Magnetic interactions have been characterized using the well known DCD-IRM remanence protocols, $\delta M$ plots, and magnetic viscosity measurements. We have observed a strong correlation between the domain configuration and the sign of the magnetic interactions. Planar domains are associated with positive exchange-like interactions, while stripe domains have a strong negative dipolar-like contribution. In this last case we have found a close correlation between the interaction parameter and the surface dipolar energy of the stripe domain structure. Using time dependent magnetic viscosity measurements, we have also estimated an average activation volume for magnetic reversal, $\langle V_{ac}\rangle \sim 1.37\times 10^{4}$ nm$^{3},$ which is approximately independent of the film thickness or the stripe period.Comment: 25 pages, 11 figure

In silico before in vivo: How to predict the heating efficiency of magnetic nanoparticles within the intracellular space

This work aims to demonstrate the need for in silico design via numerical simulation to produce optimal Fe 3 O 4 -based magnetic nanoparticles (MNPs) for magnetic hyperthermia by minimizing the impact of intracellular environments on heating efficiency. By including the relevant magnetic parameters, such as magnetic anisotropy and dipolar interactions, into a numerical model, the heating efficiency of as prepared colloids was preserved in the intracellular environment, providing the largest in vitro specific power absorption (SPA) values yet reported. Dipolar interactions due to intracellular agglomeration, which are included in the simulated SPA, were found to be the main cause of changes in the magnetic relaxation dynamics of MNPs under in vitro conditions. These results pave the way for the magnetism-based design of MNPs that can retain their heating efficiency in vivo, thereby improving the outcome of clinical hyperthermia experiments

Roma y Bilbilis, temas recurrentes en la poesía de Marcial

En el siglo L d.C., cuando la civilización romana alcanza su mayor expansión y perfección y, por primera vez, desplaza y supera a la cultura griega, Roma se convierte en el centro de un inmenso imperio y asume el papel de conductora y unificadora de toda la cultura occidental. [...] Si bien numerosos escritores latinos de esta época celebraron su grandeza (por ej., Plinio el Viejo: Hist. Nat. XXVIl.3; Tácito: Hist. IV.74 y Plinio el Joven: Paneg. 32), otros prefirieron mostrar sus contradicciones y describir o censurar sus vicios y miserias como Petronio, Marcial y Juvenal. [Extraído del texto a modo de resumen]Facultad de Humanidades y Ciencias de la Educació

DIAGNÓSTICO NUTRICIONAL DE NIÑOS ENTRE 3 Y 5 AÑOS QUE ASISTEN AL JARDÍN INFANTIL “LA GOTITA” DE PUERTO MONTT, DURANTE EL PRIMER SEMESTRE DEL AÑO 2006. VALDIVIA. CHILE

Infantile obesity is an important problem of public health whose prevention measures should start in the early stages of life, where parents should be involved. If parents are not able to detect overweight or obesity in their own children, measures carried out to prevent the infantile obesity will be hardly successful. Te aim of the present quantitative, cross-section, and descriptive investigation, not experimental, was to determine the nutritional state of children that attend the Kindergarten La Gotita, in Puerto Montt, during the first semester of 2006, regarding age, gender, weight and size. The studied population, after having applied exclusion criteria, was constituted by 107 children, of which 56% were men and the remaining 44% were women. According to nutritional state, by age, children in risk of undernourished were 8% and it decreased to 0% at the age of 5. Within this group of children in risk of undernourished, none of them presented size deficit. Additionally, the children with overweight dropped from 14% in March to 9% in July, obese children also dropped from 10% in March to 9% in July. Overweight was observed in all ages in both genders and a deficit in children of 3 and 4 years old in both genders. The proportion of obese women was higher than in men in every month of the study and at all ages. Less than half (20%) of obese children’s parents did not presented chronic illnesses no-communicable, risk factors, considered inside the norm of outpatient handling with overweight due to undernourishment. Therefore, it is extremely important while evaluating an obese child. The children of this study, at all ages and in both genders have high percentages of overweight and obesity. Less than half (7.4%) that is managed at national level, thus it becomes necessary to adopt preventive measures from an early age such as, motivating mothers to maintain their children controlling their health constantly during the previous preschool years, developing specific educational programs about appropriate feeding for each age, promoting healthy habits, and avoiding little physical activity, since those factors may lead to complications in the adulthood.La obesidad infantil es un problema importante de salud pública cuyas medidas de prevención deben iniciarse en etapas tempranas de la vida, en las que deben involucrarse los padres. Si éstos no son capaces de percibir el sobrepeso o la obesidad en sus hijos preescolares, difícilmente las medidas destinadas a prevenir la obesidad infantil podrán tener éxito. La presente investigación cuantitativa, transversal, descriptiva, no experimental, buscó determinar el estado nutricional de los niños que asisten al Jardín Infantil La Gotita, de Puerto Montt, durante el primer semestre del año 2006, en relación a la edad, sexo, peso y talla. La población en estudio, luego de aplicar criterios de exclusión, quedó conformada por 107 niños, de los cuales el 56% corresponde a hombres y el restante 44% a mujeres. Según estado nutricional, por año de edad, los niños en riesgo de desnutrir son el 8% y disminuyen a 0% a los 5 años. De este grupo de niños con riesgo de desnutrir, ninguno presentaba déficit de talla. Los niños con sobrepeso disminuyen de 14% en marzo, a un 9% en julio; los niños obesos también disminuyen de 10% en marzo, a 9% en julio. Se observa exceso de peso en todas las edades en ambos sexos. Y déficit en niños de 3 a 4 años, también en ambos sexos. La proporción de mujeres con obesidad es mayor que la de los hombres, en todos los meses del estudio y en todas las edades. El 20% de los padres de niños obesos, presentó enfermedades crónicas no transmisibles, factores de riesgo considerados dentro de la norma para el “manejo ambulatorio de la malnutrición por exceso” del ministerio y, por lo tanto, muy importante en el momento de evaluar a un niño obeso. Por lo que se refiere a los niños de este estudio, en todas las edades y en ambos sexos encontramos alta prevalencia de sobrepeso y obesidad, por sobre el 7.4% que se maneja a nivel nacional, lo que amerita adoptar medidas preventivas desde temprana edad: incentivar a las madres a mantener a sus hijos en control de salud constante durante la etapa preescolar; desarrollar programas educativos específicos sobre alimentación adecuada para cada edad; fomentar hábitos saludables y evitar el sedentarismo, ya que ellos, son factores conducentes a complicaciones en la edad adulta

Anteproyecto de construccion de una embarcacion tipica de Chiloe

149 p