322 research outputs found
Relatos de mujeres que dejaron huellas
No full textFil: Romero, C.. Escuela de Aviación Militar. Fuerza Aérea Argentina.Fil: Rolles, M. L.. Escuela de Aviación Militar. Fuerza Aérea Argentina.Fil: Valentinuzzi, P.. Escuela de Aviación Militar. Fuerza Aérea Argentina
El análisis físico de diferentes sustratos para el cultivo hidropónico de plantines de lechuga
No full textFil: Fontanini, Luciana. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Ingeniería y Mecanización Rural. Catedra de Física; Argentina.Fil: Argüello, J. A. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuaria. Departamento de Producción vegetal. Escuela para Graduados; Argentina.Fil: Bima, P. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Producción Vegetal. Cátedra de Sistema de Producción de Cultivos Intensivos; Argentina.Fil: Valentinuzzi, M. C. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Ingeniería y Mecanización Rural. Catedra de Física; Argentina.Fil: Valentinuzzi, M. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación. Argentina.Fil: Valentinuzzi, M. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina.El sustrato de los almácigos es crucial para obtener plantines de calidad en cualquier tipo de cultivo. El alto costo de los sustratos importados, requiere utilizar materiales locales, subproductos de la agroindustria estables y de probada calidad e inocuidad. Las propiedades físicas de los sustratos son críticas y difíciles de modificar una vez en el contenedor. El objetivo de este trabajo fue analizar las propiedades físicas de tres sustratos: arena, lana de oveja y guata siliconada de plantines de lechuga. En la arena se observó una porosidad total, porosidad de aireación y capacidad de retención de agua menor que en los demás tratamientos. La guata siliconada mostró propiedades físicas similares a la lana de oveja. El uso de sustratos locales, biodegradables y económicos como la lana de oveja promueve la sostenibilidad y la economía circular al aprovechar subproductos ovinos. Los productores priorizan la relación costo/beneficio y la disponibilidad en el mercado al seleccionar un sustrato.info:eu-repo/semantics/publishedVersionFil: Fontanini, Luciana. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Ingeniería y Mecanización Rural. Catedra de Física; Argentina.Fil: Argüello, J. A. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuaria. Departamento de Producción vegetal. Escuela para Graduados; Argentina.Fil: Bima, P. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Producción Vegetal. Cátedra de Sistema de Producción de Cultivos Intensivos; Argentina.Fil: Valentinuzzi, M. C. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Ingeniería y Mecanización Rural. Catedra de Física; Argentina.Fil: Valentinuzzi, M. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía, Física y Computación. Argentina.Fil: Valentinuzzi, M. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física Enrique Gaviola; Argentina
The Fractional Virial Potential Energy in Two-Component Systems
No full textTwo-component systems are conceived as macrogases, and the related equation of state is expressed using the virial theorem for subsystems, under the restriction of homeoidally striated density profiles. Explicit calculations are performed for a useful reference case and a few cases of astrophysical interest, both with and without truncation radius. Shallower density profiles are found to yield an equation of state, , characterized (for assigned values of the fractional mass, ) by the occurrence of two extremum points, a minimum and a maximum, as found in an earlier attempt. Steeper density profiles produce a similar equation of state, which implies that a special value of is related to a critical curve where the above mentioned extremum points reduce to a single horizontal inflexion point, and curves below the critical one show no extremum points. The similarity of the isofractional mass curves to van der Waals' isothermal curves, suggests the possibility of a phase transition in a bell-shaped region of the plane, where the fractional truncation radius along a selected direction is , and the fractional virial potential energy is . Further investigation is devoted to mass distributions described by Hernquist (1990) density profiles, for which an additional relation can be used to represent a sample of elliptical galaxies (EGs) on the plane. Even if the evolution of elliptical galaxies and their hosting dark matter (DM) haloes, in the light of the model, has been characterized by equal fractional mass, , and equal scaled truncation radius, or concentration, , , still it cannot be considered as strictly homologous, due to different values of fractional truncation radii, , or fractional scaling radii, , deduced from sample objects
Theoretical Models
No full textThis compendium gives a comprehensive overview of the advances in fibrillation-defibrillation knowledge — recognition of fibrillation as a unique life threatening cardiac arrhythmia; discovery of the electric discharge in its double role of culprit and savior; and technological improved contributions.
The book stands on the well-known philosophy of Education-Based on Problems (or EBP), that is, take fibrillation as a medical daily problem and search for that knowledge, technique or principle trying to solve it.
The book is interdisciplinary, multidisciplinary and transdisciplinary. It addresses undergraduate and graduate biomedical engineering students, physicians going into cardiology, clinical engineers and clinical engineering technicians, nurses, paramedics and emergency medical personnel
WINGS JK photometry of 28 galaxy clusters (Valentinuzzi+, 2009)
No full textPhotometric parameters in the J,K near-infrared filters are presented for 28 nearby galaxy clusters
Theoretical Models
No full textThis compendium gives a comprehensive overview of the advances in fibrillation-defibrillation knowledge — recognition of fibrillation as a unique life threatening cardiac arrhythmia; discovery of the electric discharge in its double role of culprit and savior; and technological improved contributions.
The book stands on the well-known philosophy of Education-Based on Problems (or EBP), that is, take fibrillation as a medical daily problem and search for that knowledge, technique or principle trying to solve it.
The book is interdisciplinary, multidisciplinary and transdisciplinary. It addresses undergraduate and graduate biomedical engineering students, physicians going into cardiology, clinical engineers and clinical engineering technicians, nurses, paramedics and emergency medical personnel
Propuesta didáctica de enseñanza de física por experimentación: desarrollo de actividad práctica agronómica en entorno virtual
No full textConclusiones
Dado el escenario de aislamiento social que debió asumirse frente a la pandemia, tanto docentes como alumnos cambiamos nuestros entornos de desempeño de tareas habituales. La propuesta de hacer un experimento con materiales accesibles en el hogar o en la cercanía de donde residieran los estudiantes fue una instrumentación didáctica para que pudieran hacer una trasposición de los conceptos teórico prácticos planteados desde la virtualidad a situaciones del mundo real, concreto y palpable.Fil: Valentinuzzi, María Cecilia. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Ingeniería y Mecanización Rural. Cátedra de Física; Argentina.Fil: Valentinuzzi, María Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física "Enrique Gaviola"; Argentina.Fil: Sbarato, V. M. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Ingeniería y Mecanización Rural. Cátedra de Física; Argentina.En este trabajo se presenta una estrategia didáctica utilizada en la asignatura Física I (primer año de las carreras Ingeniería Agronómica, Ingeniería Zootecnista y Licenciatura en Agroalimentos) que fue desarrollada de manera virtual durante el año 2020. El objetivo de dicha estrategia es que los alumnos integren los conocimientos adquiridos para resolver una situación práctica. Se plantea una actividad práctica para evaluar la consistencia de suelo con posibilidad de desarrollarse en el Campo Escuela de la Facultad de Ciencias Agropecuarias (UNC) o bien, en los domicilios de los alumnos empleando materiales de uso cotidiano. La tarea práctica fue desarrollada en tres etapas, con el acompañamiento de las docentes mediante las consultas a través del aula virtual. Al ser una actividad planteada con consignas abiertas, cada uno tuvo que organizar su trabajo e identificar los puntos importantes a informar; esto les permitió desarrollar su ingenio y creatividad. Mediante esta actividad alcanzó la promoción más del 40% de los alumnos. Las devoluciones de los alumnos evidencian que esta actividad les ayudó a comprender cómo se relaciona la Física con el ámbito de la Agronomía.publishedVersionFil: Valentinuzzi, María Cecilia. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Ingeniería y Mecanización Rural. Cátedra de Física; Argentina.Fil: Valentinuzzi, María Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Física "Enrique Gaviola"; Argentina.Fil: Sbarato, V. M. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Departamento de Ingeniería y Mecanización Rural. Cátedra de Física; Argentina
Ludwig: The physiologist
No full textThe thought reproduced in the above epigraph is taken from an article by Thurau et al. [1], who attribute it to Arthur Schopenhauer (17881860), an outstanding philosopher and author of the far-reaching piece Die Welt als Wille und Vorstellung (The World as Will and Representation). In German, it would perhaps read as etwas denken, das niemand vorher gedacht hat, während etwas sehen, was jeder sieht. We could not assert whether Schopenhauer really said that, but it should not be at all surprising if it were, because it sounds simple, perhaps even naïve, and very deep, indeed. It fits perfectly to Carl Friedrich Wilhelm Ludwigs personality (18161895), whom we will look at as physiologist in this second note. Yes, second notebecause in the first one [2], we looked at him as bioengineer. A third and last Retrospectroscope column completing this series will deal with his wonderful and always humble and generous activities as teacher. © 2012 IEEE.Fil: Valentinuzzi, Maximo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; ArgentinaFil: Beneke, Klaus. Christin-Albrechts-University; AlemaniaFil: González, Germán Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Bioquímica y Medicina Molecular. Universidad de Buenos Aires. Facultad Medicina. Instituto de Bioquímica y Medicina Molecular; Argentin
Test of Clausius' Virial Dynamical Theory of Fundamental Plane By Homogeneous + γ-Free Two Component Galaxy Model
No full textIntroduction: the theory of the Fundamental Plane (FP) proposed by Secco (2000, 2001,2005) is based on the existence of a maximum in the Clausius' Virial potential energy (CV) of a stellar component when it is
completely embedded inside a dark matter (DM) halo. At the first order approximation the theory was developed by modeling the two-components with two power-law density profiles and two homogeneous cores. In order to test the extension of the theory to an higher order we explore the effect on an homogeneous stellar component due to a DM halo with a density profile characterized by a inner slope γfree and an outer slope -3, according to high resolution rotation curves of Sps (Garrido et al. 2004). The aim is to investigate the role of the dark to bright mass ratio m and of the halo concentration C[D] in order to produce the maximum of CV. Particular attention is devoted to the slope of the density halo profile at the maximum location, to its height in comparison with the CV value when the two component coincide, V[n.] For all the models we choose γ=0. Method: we follow the general method
proposed by Caimmi (1993) for two striated ellipsoidals with Zhao-density profiles. Virial equilibrium is described by tensor virial equations extended to two subcomponents (Caimmi & Secco,1992). The interaction terms are numerically performed for different values of m and C [D] and sequences of CV as function of the ratio baryonic to halo virial semi-axis are taken into account. Results: the special configuration at the CV maximum with all the properties discovered with the theory of first order appears if m is greater than a given threshold.The corresponding slope (in absolute value) on the halo DM profile decreases either as m increases at fixed C[D] or as C[D] decreases at fixed m. The same conspiracy between m and C[D] appears in order to obtain the highest values of V[n]. Discussion: the test is relevant in order to confirm the main results of the first order approach and then to move the description of the main features of galaxy FP toward more realistic models
Bioinoculants as Promising Complement of Chemical Fertilizers for a More Sustainable Agricultural Practice
No full textPlant Growth Promoting Rhizobacteria (PGPR) represent a heterogeneous group of bacteria, which have been characterized for their ability to influence the growth and the fitness of agricultural plants. In the quest of more sustainable practices, PGPR have been suggested as a valid complement for the agronomical practices, since they can influence several biochemical and molecular mechanisms related to the mineral nutrients uptake, the plant pathogens suppression, and the phytohormones production. Within the present work, three bacterial strains, namely Enterobacter asburiae BFD160, Pseudomonas koreensis TFD26, and Pseudomonas lini BFS112, previously characterized on the basis of distinctive PGPR traits, were tested to evaluate: (i) their persistence in soil microcosms; (ii) their effects on seeds germination; (iii) their possible influence on biochemical and physiological parameters related to plant growth, fruit quality, and plant nutrient acquisition and allocation. To these aims, two microcosms experiments featuring different complexities, i.e., namely a growth chamber and a tunnel, were used to compare the effects of the microbial inoculum to those of chemical fertilization on Cucumis sativus L. plants. In the growth experiment, the Pseudomonas spp. induced positive effects on both growth and physiological parameters; TFD26, in particular, induced an enhanced accumulation of mineral nutrients (Fe, Ca, Mn, Ni, Zn) in plant tissues. In the tunnel experiment, only P. koreensis TFD26 was selected as inoculum for cucumber plants used in combination or in alternative to a chemical fertilizer. Interestingly, the inoculation with TFD26 alone or in combination with half-strength chemical fertilizer could induce similar (e.g., Ca accumulation) or enhanced (e.g., micronutrients concentration in plant tissues and fruits) effects as compared to plants treated with full-strength chemical fertilizers. Overall, the results hereby presented show that the use of PGPR can lead to comparable, and in some cases improved, effects on biochemical and physiological parameters of cucumber plants and fruits. Although these data are referred to experiments carried out in controlled condition, though different from an open filed cultivation, our observations suggest that the application of PGPR and fertilizers mixtures might help shrinking the use of chemical fertilization and potentially leading to a more sustainable agricultural practice
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