Search results for "Proa"
showing 10 items of 1834 documents
Flow Resistance in Step-Pool Rills
2017
Rills evolve morphologically, and the adjustment of rill channel geometry to flow affects the relationships among velocity, discharge, and slope. The resistance to flow in step-pool rills is mainly due to form-induced mechanisms and, in comparison, grain resistance is of minor significance. Previous studies on rill flow resistance have been performed exclusively for grainresistance conditions and use a stream flow equation. In this study, a new flow resistance equation, deduced by applying dimensional analysis and self-similarity theory, was applied to rill flow in step-pool channels. First, the incomplete self-similarity hypothesis was used for establishing a power flow velocity profile wh…
An MAS-based subjective model for indoor adaptive thermal comfort
2015
The achievement of high level personalized sets of comfort parameters is contemplated within the more general context of the so-called smart buildings, where people, by means of the new communication technologies, become active actors to the process of the singling out and control of the best indoor conditions. This Dynamic Intelligence approach would usefully contribute to a better energy efficient and environmental friendly management of buildings. Multi-Agent schemes are suitable tools in this aim, since they are able to manage the user-building-plant system where the adaptivity of people to the indoor conditions is suitably achieved. In this paper a contribution to a development of the …
Probing ensemble polymorphism and single aggregate structural heterogeneity in insulin amyloid self-assembly.
2020
Ensembles of protein aggregates are characterized by a nano- and micro-scale heterogeneity of the species. This diversity translates into a variety of effects that protein aggregates may have in biological systems, both in connection to neurodegenerative diseases and immunogenic risk of protein drug products. Moreover, this naturally occurring variety offers unique opportunities in the field of protein-based biomaterials. In the above-mentioned fields, the isolation and structural analysis of the different amyloid types within the same ensemble remain a priority, still representing a significant experimental challenge. Here we address such complexity in the case of insulin for its relevance…
Special Issue: Enhancing Sustainable Performance in Organizational and Inter-Institutional Systems
2013
Sustainability is not just for Christmas… it’s for life. Sustainable solutions, whether sought in terms of business strategies, social policies, or the exploitation of natural resources have to serve organizations and communities in the long term, sometimes very long term, as well as the short term. Static analysis is unlikely to be able to evaluate candidate solutions fully, and is more likely to focus on the short-term future to the detriment of the longer-term. Sustainable solutions are more likely to be developed from studies based on deep analysis using systems approaches, and from system dynamics (SD) approaches in particular.
The evolution of the local role(s) of the university in a low-tech region
2013
The present case study addresses the case of a geographical area neglected by most of the literature about the changing role of Higher Education Institutions (HEIs): the low-tech contexts. This literature has traditionally exhibited two primary aspects. First, a focus on success stories such as entrepreneurial universities located in high-tech regions (e.g. Silicon Valley). Second, it reveals an inclination towards an evolution from ivory towers to entrepreneurial universities. The article argues that this oversimplification does not apply exactly to some environments where the HEIs have maintained links with industry since their inception. The purpose is to demonstrate HEIs' relevance in l…
The consequences of physical post-treatments (microwave and electron-beam) on food/packaging interactions: A physicochemical and toxicological approa…
2016
IF 4.052; The safety of microwave and electron-beam treatments has been demonstrated, in regards to the formation of reaction products that could endanger human health. An integrated approach was used combining the potential toxicity of all the substances likely to migrate to their chemical characterizations. This approach was applied to polypropylene (PP) films prepared with a selection of additives. Components were identified by liquid and gas chromatography using a mass selective detector system. Their potential toxicity was assessed using three in vitro short-term bioassays and their migrations were carried out using a standards-based approach. After the electron-beam treatment some add…
The proanthocyanidin content as a tool to differentiate between Lotus tenuis and L. corniculatus individuals
2012
Abstract Lotus tenuis Wald et Kit and Lotus corniculatus L. are conspicuous elements of the agricultural landscape for cattle production. In South America, commercial L. tenuis stocks usually present contaminations with L. corniculatus, what brings about an important economical injure to the forage producers. A way to reduce or avoid loses is to assess the purity degree of L. tenuis seed lots before seeding. Methods so far described for the diagnosis of Lotus species when flowers are not available are lengthy, time consuming, need the implementation of sophisticated laboratories and are relatively expensive. It has been shown that Lotus species accumulate variable proanthocyanidins amounts,…
Multidisciplinary approach in the removal of post-trauma foreign bodies in the head and neck district: cases report and review of literature
2019
Introduction: The management of foreign bodies (FBs) penetrating the head and neck district is a condition rare but at risk for the patient’s life because this district is particularly rich in vital structures. Therefore, their management requires a multidisciplinary approach. Materials and methods: In this study we retrospectively examine two emblematic cases among 183 that occurred in our hospital from January 2008 to December 2017. Results: There were 183 cases of FBs of the head and neck district submitted to extraction with a range of age of between 18 months old and 79 years old. Of 183 patients, 112 were children, 60 were adults. The incidence was prevalent among children, with 112 c…
¿Navegando contra la corriente? : transición educativo-laboral de jóvenes egresados de la educación secundaria técnico profesional en Chile
2020
La educación media técnico profesional (EMTP) representa un componente central de la oferta formativa de la educación secundaria en Chile, cubriendo un porcentaje cercano al 40% de los estudiantes de los dos últimos grados de enseñanza obligatoria, fundamentalmente aquellos que provienen de los sectores más pobres de la socidad. Tal relevancia, sin embargo, no ha tenido un correlato en el desarrollo de políticas tendientes a fortalecer su modelo formativo o articularse con las necesidades productivas del país. Los antecedentes muestran que los egresdados de la EMTP presentan recorridos hetrogéneos y especialmente complejos. Factores estructurales vinculados a los altos grados de vulnerabili…
Identification and Robust Control of a Quadratic DC/DC Boost Converter by Hammerstein Model
2015
This paper deals with the theoretical framework definition and the experimental application of the Hammerstein (HM) identification and related robust control technique to a quadratic dc/dc single-switch boost (Q-boost) converter. A set of fourth-order transfer functions (TFs) has been identified with the Hammerstein approach, on the basis of a pseudorandom-binary-sequence (PRBS) excitation signal. The set of identified TFs has been then used to design a suitable robust control technique, able to properly deal with the converter parameter uncertainty and load variations. The proposed approach has been tested in numerical simulation and validated experimentally on a suitably developed test se…