574 research outputs found
Chua´s circuit and its characterization as a filter
"This article deals with Chuaʼs circuit characterization from the point of view of a filter based on the concept of piecewise linear functions. Furthermore, experiments are developed for teaching electronic systems that can be used for novel filtering concepts. The frequency range in which they are tested is from to , due to the audio spectrum comprised in this frequency range. The node associated with the capacitor and Chuaʼs diode is used as input, and the node for another capacitor and the coil is used as output, thereby establishing one input–output relationship for each system case given by the piecewise linear functions. The experimental result shows that Chuaʼs circuit behaves as a bandpass filter-amplifier, with a maximum frequency around and bandwidth between and . The results presented in this paper can motivate engineering students to pursue applications of novel electrical circuits based on topics that are of potential interest in their future research studies.
Multidisciplinary teaching of Biotechnology and Omics sciences
In the last years, there was a great boom in the Omics fields that have developed as multidisciplinary
sciences. They use laboratory techniques related to Biology and Chemistry but also Bioinformatics
tools. However, the developmental progress of these disciplines has led that much of undergraduate
studies related to Biology have curricula that become outdated. From this point of view, it is
necessary to focus the students to the fundamentals and techniques of complementary disciplines that
will be essentials for the understanding of the Omics sciences. In the present work, we have
developed a new teaching approach for Biochemistry, Biology and Bioinformatics students. They
formed interdisciplinary working groups. These groups have prepared and presented
communications about different techniques or methods in Molecular Biology, Omics or
Bioinformatics participating in a technical meeting. This learning strategy “I do and I learn” has
enabled to the students a first contact with the scientific communication including the approach to the
scientific literature to acquire technical knowledge. The cooperation between students from different
disciplines has enriched their point of view and even has been used in some practical master’s works.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech
Response to water deficit on tree growth from urban forestry of Mendoza city : comparative analysis in sapling trees
El objetivo del trabajo fue evaluar la
respuesta de plantas jóvenes de cuatro
especies forestales urbanas a diferentes
niveles de déficit hídrico. El ensayo se realizó
en vivero, durante tres ciclos vegetativos,
con plantas de Platanus x hispanica cv. acerifolia (plátano), Morus alba (morera),
Fraxinus americana (fresno americano) y Acacia
visco (visco). Los tratamientos de riego fueron:
control (reposición del 100% transpirado);
riego deficitario moderado (reposición del 66%
transpirado) y riego deficitario severo (reposición
del 33% transpirado). Las variables de respuesta
evaluadas fueron altura, diámetro de tallos, área
foliar y ancho de anillos de crecimiento. Las
plantas bajo riego deficitario severo presentaron
disminuciones en todos los parámetros de
crecimiento considerados. Acacia visco resultó
con crecimientos comparables al control, bajo
riego deficitario equivalente al 66% del agua
transpirada, con lo cual puede ser considerada
especie de interés para forestaciones en
condiciones de estrés hídrico moderado.The objective was to evaluate the young
plants response of four urban forest species at
different levels of water deficit. The manipulative
experiment was conducted in nursery for three
growing seasons, with saplings of Platanus x
hispanica cv. acerifolia (London plane), Morus
alba (mulberry), Fraxinus americana (American
ash) and Acacia visco (visco). The catering
treatments were: control (replacement of 100%
water transpired), moderate deficit watering
(replacement of 66% water transpired) and
severe deficit watering (replacement of 33%
water transpired). Response variables measured
were height, stem diameter, leaf area and
annual tree-rings width. Plants under severe
deficit watering showed decreases in all growth
parameters considered. Acacia visco under
moderate deficit watering equivalent to 66%
of transpired water had a growth comparable
to control. Therefore, this specie could be
considered relevant to new forestations in
moderate water stress conditions.Fil: Martínez, Claudia.
CONICET. CRICYT. INCIHUSA (Instituto de Ciencias Sociales, Humanas y Ambientales)Fil: Cavagnaro, Juan Bruno.
Universidad Nacional de Cuyo. Facultad de Ciencias AgrariasFil: Roig Juñent, Fidel A..
Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA).Fil: Cantón, María Alicia.
CONICET. CRICYT. INCIHUSA (Instituto de Ciencias Sociales, Humanas y Ambientales
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