586 research outputs found
Software educativo en línea para la enseñanza y el aprendizaje de temas de Cálculo Numérico
En un proyecto de investigación finalizado, se diseñó un software de escritorio para la enseñanza y el aprendizaje del tema Resolución Numérica de Ecuaciones no Lineales, usando el paquete MatLab
Self-efficacy and readiness to change to physical activity in college students
The aim of this research was to identify the association between perceived self-efficacy and readiness to change and their relationship with physical activity. 199 random-selected undergraduate students participated in the study. Participants answered a set of questionnaires measuring self-efficacy about physical exercise, readiness to change, general health, attitude regarding physical activity, and self-reported physical activity. Results showed significant bivariate associations between physical activity and independent variables. Using a multivariate model, only readiness to change was significant, associated with physical activity. Results suggest that readiness to change is the most important variable in association with self-reported physical activity.El propósito de esta investigación fue identificar la asociación entre la autoeficacia percibida y la disposición al cambio y su relación con la realización de actividad física. Participaron 199 estudiantes universitarios elegidos aleatoriamente. Se aplicaron un cuestionario de Autoeficacia, un algoritmo para evaluar la Disposición al Cambio, el cuestionario General de Salud (CGS), un Cuestionario de Actividad Física y uno sobre actitud hacia ésta. Los resultados mostraron asociaciones bivariadas significativas entre la actividad física y las variables independientes. En un modelo multivariado, solamente la etapa de cambio se asoció significativamente con la actividad física. Se concluye que la disposición al cambio es la variable más relevante en la asociación con la actividad física auto-reportada
Supramolecular associations between atypical oxidative phosphorylation complexes of Euglena gracilis
An MSSS-preconditioned Matrix Equation Approach for the Time-Harmonic Elastic Wave Equation at Multiple Frequencies
Design and implementation of wireless sensor network with LoRa technology for industrial monitoring
El creciente desarrollo del Internet de las Cosas (IoT, Internet of Things) ha diversificado sus campos de aplicación, mejorando no solo la interconexión de personas, sino también, la comunicación entre maquinaria industrial (M2M, Machine-to-Machine), en las que sus características en alcance, escalabilidad y bajo costo de despliegue, pueden ser aprovechadas. Las tecnologías LoRa y LoRaWAN se muestran como una de las principales opciones de comunicación inalámbrica de bajo costo en la integración de sistemas industriales con mira a los nuevos requerimientos de la Industria 4.0. En este trabajo se realizó una campaña de mediciones y el análisis de los datos obtenidos, para evaluar el comportamiento y la aplicabilidad de las tecnologías LoRa y LoRaWAN dentro de ambientes industriales. Para contrastar los resultados, se realizaron pruebas en ambientes urbanos despejados, donde se observó que las condiciones dentro de las naves industriales, permiten establecer un enlace con condiciones de radio frecuencia favorables. Inicialmente se han considerado escenarios de corto alcance (<100 m) en los que se mantiene una línea de vista entre el transmisor y el receptor.The growing development of the Internet of Things (IoT) has diversified its fields of application, improving not only the interconnection of people but as well the communication between industrial machinery (M2M, Machine-to-Machine), in which its features in range, scalability, and low cost of deployment can be taken advantage of. LoRa and LoRaWAN technologies are presented as one of the main low-cost wireless communication options in the integration of industrial systems with a view to the new requirements of Industry 4.0. In this work, a measurement campaign and the analysis of the data obtained were performed to evaluate the behavior and applicability of LoRa and LoRaWAN technologies within industrial environments. To contrast the results, tests were performed in clear urban environments, where it was observed that the conditions inside the industrial buildings allow the establishment of a link with favorable radio frequency conditions. Initially, short-range scenarios (<100 m) have been considered in which a line of sight is maintained between the transmitter and the receiver
Supramolecular associations between atypical oxidative phosphorylation complexes of Euglena gracilis
In vivo associations of respiratory complexes forming higher supramolecular structures are generally accepted nowadays. Supercomplexes (SC) built by complexes I, III and IV and the so-called respirasome (I/III2/IV) have been described in mitochondria from several model organisms (yeasts, mammals and green plants), but information is scarce in other lineages. Here we studied the supramolecular associations between the complexes I, III, IV and V from the secondary photosynthetic flagellate Euglena gracilis with an approach that involves the extraction with several mild detergents followed by native electrophoresis. Despite the presence of atypical subunit composition and additional structural domains described in Euglena complexes I, IV and V, canonical associations into III2/IV, III2/IV2 SCs and I/III2/IV respirasome were observed together with two oligomeric forms of the ATP synthase (V2 and V4). Among them, III2/IV SC could be observed by electron microscopy. The respirasome was further purified by two-step liquid chromatography and showed in-vitro oxygen consumption independent of the addition of external cytochrome c
Oral and general health of the people of Asunción and San Miguel’s communities in relation to social and environmental conditions in non-irrigated areas of Lavalle
Nuestra zona de estudio, el Noreste del Departamento de
Lavalle en la Provincia de Mendoza, es una zona árida propia del borde oriental de la Cordillera de Los Andes. Sólo
es productivo un pequeño porcentaje de la superficie total,
gracias a la nieve y deshielo de la cordillera, que aprovecha
los cursos de los ríos y también por la construcción de diques.
La zona que nos ocupa hace algo más de cien años
era un área cubierta de lagunas que se formaban por los
desagües de los Ríos Mendoza y San Juan. Los objetivos son
el estudio de la salud oral y salud general de los pobladores
de las comunidades de Asunción y San Miguel, teniendo en
cuenta características desde lo social antropológico, y asociarlas
con problemáticas como la ambiental, las culturales,
la relación con la tierra, la población originaria (pueblos
huarpe), el agua, la educación, entre otros aspectos. El enfoque
es interdisciplinario, ya que se integra la Sociología,
la Odontología desde distintas especialidades, las Ciencias
Médicas, Comunicadores Sociales y Literatura. Se utilizan
métodos cuantitativos y cualitativos. Entre otros aspectos
se realizaron análisis de contenido de arsénico y fluor en el
agua de pozo de esta zona de estudio.Our study area, Northeast Department of Lavalle in
the Province of Mendoza, is a very arid area of the ambientaleseastern
edge of the Andes. It is productive only a small
percentage of the total area, thanks to melting snow and
the mountain range that takes advantage of the courses
of rivers and building dikes po. The area in question more
than a hundred years ago was a covered area of gaps
formed by the drains of the rivers Mendoza and San Juan.
The objectives are the study of oral health and general
health of the residents of the communities of Asuncion
and San Miguel, taking into account character-istics from
the social anthropological, and associate them with issues
such as environmental, cultural, relationship to the land,
the original population (people huarpe), water, education,
among others. The approach is interdisciplinary, since
sociology, from different specialties Dentistry, Medical
Sciences, Social Communicators and Literature is
integrated. Quantitative and qualitative methods are
used. Among other things analysis of arsenic and fluoride
in well water of this area of study were per-formed.Fil: García Cardoni, Mario Oscar.
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Martínez, Graciela.
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: García Crimi, Graciela Edith.
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Sicilia, A..
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Astudillo, Jésica.
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Hellwig, German.
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Hiramatsu, Teresa.
Universidad Nacional de Cuyo. Facultad de Ciencias AgrariasFil: Esterlich, María José.
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Palmili, Rodrigo.
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Gonzá{ez Pellizzari, N..
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Galdeano, F..
Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Astudillo, E..
Universidad Nacional de Cuyo. Facultad de Ciencias Políticas y SocialesFil: Giandomenico, E.
Low X-Ray Luminosity Galaxy Clusters: Main goals, sample selection, photometric and spectroscopic observations
We present the study of nineteen low X-ray luminosity galaxy clusters (L 0.5--45 erg s), selected from the ROSAT
Position Sensitive Proportional Counters (PSPC) Pointed Observations (Vikhlinin
et al. 1998) and the revised version of Mullis et al. (2003) in the redshift
range of 0.16 to 0.7. This is the introductory paper of a series presenting the
sample selection, photometric and spectroscopic observations and data
reduction. Photometric data in different passbands were taken for eight galaxy
clusters at Las Campanas Observatory; three clusters at Cerro Tololo
Interamerican Observatory; and eight clusters at the Gemini Observatory.
Spectroscopic data were collected for only four galaxy clusters using Gemini
telescopes. With the photometry, the galaxies were defined based on the
star-galaxy separation taking into account photometric parameters. For each
galaxy cluster, the catalogues contain the PSF and aperture magnitudes of
galaxies within the 90\% completeness limit. They are used together with
structural parameters to study the galaxy morphology and to estimate
photometric redshifts. With the spectroscopy, the derived galaxy velocity
dispersion of our clusters ranged from 507 km~s for [VMF98]022 to 775
km~s for [VMF98]097 with signs of substructure. Cluster membership has
been extensively discussed taking into account spectroscopic and photometric
redshift estimates. In this sense, members are the galaxies within a projected
radius of 0.75 Mpc from the X-ray mission peak and with cluster centric
velocities smaller than the cluster velocity dispersion or 6000 km~s,
respectively. These results will be used in forthcoming papers to study, among
the main topics, the red cluster sequence, blue cloud and green populations;
the galaxy luminosity function and cluster dynamics.Comment: 13 pages, 6 tables, 9 figures. Uses emulateapj. Accepted for
publication in The Astronomical Journal. Some formatting errors fixe
Comportamiento de cultivares de soja de los GMII al V en diferentes fechas de siembra, en el ambiente de Santa Rosa, La Pampa
Se determinó la influencia ejercida por el termoperíodo y fotoperíodo en el desarrollo fenológico de cultivares correspondientes a los GM II al V, Para poder generar diferencias en estos últimos factores se realizaron 5 fechas de siembra desde octubre a diciembre. Para todos los cultivares y fechas de siembra se realizó el seguimiento fenológico, se midió el número de nudos (N°N) en R1, R5 y R8 y en este estado también la producción de MS, Se determinaron los componentes de rendimiento: número de vainas por planta (NVPP), peso de mil semillas (PMS), rendimiento de grano por hectárea (R) e índice de cosecha (IC). La etapa más afectada en su duración, en número de días por la fecha de siembra corresponde a Vc-RI, acentuándose este efecto cuando mayor es el GM. Se puede observar menor diferencia en la duración de ciclo entre los cultivares de GM II, con los de mayor GM a medida que se atrasa la fecha de siembra. Las variedades más precoces presentan los mejores valores de MS. La MS total muestra un ajuste de 43,7% con el rendimiento. A las variedades de GM II y III le corresponde los mejores valores de rendimiento. Todos los resultados se encuentran muy afectados por el estrés hídrico sufrido durante el ciclo de cultivo
Toxoplasma gondii Infection and Threatened Abortion in Women from Northern Peru
Introduction. Toxoplasma gondii infection can cause important complications during pregnancy. Threatened abortion may be a late indicator for infection in settings with high prevalence of toxoplasmosis. We aimed to determine the association between T. gondii infection and threatened abortion in women from northern Peru. Methods. We conducted a secondary analysis of a cross-sectional study in pregnant women from a hospital and a rural community in Lambayeque, Peru. Exposure variable was serological diagnosis of toxoplasmosis, defined as the demonstration of either IgM or IgG antibodies against T. gondii. Outcome variable was threatened abortion, defined as the diagnosis of bloody vaginal discharge or bleeding during the first half of pregnancy. Prevalence ratios were estimated in simple and multiple regression analyses. Results. Of 218 pregnant women, 35.8% presented positive serology for T. gondii and 14.7% had threatened abortion in their current pregnancy. Pregnant women with positive T. gondii infection had 2.45-fold higher frequency of threatened abortion (PR: 2.45, 95% CI: 1.15-5.21). In addition, the frequency of threatened abortion decreased by 9% for each additional year of age (PR: 0.91, 95% CI: 0.86-0.97). A previous history of threatened abortion also showed a higher frequency of threatened abortion (PR: 5.22, 95% CI: 2.45-11.12). Conclusions. T. gondii infection is associated with threatened abortion. An early age of pregnancy and a previous history of abortion are also associated with this condition
- …