Search results for " Chemical engineering"
showing 10 items of 2965 documents
Numerical Investigation of a Wood-Chip Downdraft Gasifier
2019
Biomass gasification is regarded as one of the most promising technology in the renewable energy field. The outcome of such operation, i.e. the synfuel, can be exploited in several ways, for example powering engines and turbines, and is considered more flexible than the biomass itself. For this reason, a careful analysis of the gasification performance is of paramount importance for the optimization of the process. One of the techniques that can be used for such a purpose, is the numerical analysis. CFD is indeed a tool that can be of great help in the design and study of the operation of the gasifier, allowing for an accurate prediction of the operating parameters. In this work, a downdraf…
A study of solar panel efficiency in Latvian climate conditions
2020
With solar panels increasingly used in nearly zero energy building solutions it is important to clarify if the panels can achieve the efficiency indicators specified by their producers in real operation conditions. To determine the efficiency of poly- and monocrystalline panels depending on their spatial orientation and the seasons a set of test panels was installed in 2018 in Riga, Latvia for long-term monitoring of the amount of generated power and produced energy. Here we summarize the results of the first year of monitoring. Data indicate that orientation has high significance, very small amounts of energy are generated in autumn/winter and that there is a good correspondence of the act…
Reflexiones y experiencias acerca del aprendizaje de la Psicología Positiva y los Enfoques Salugénicos
2015
En la Primera Cumbre Anual de Psicología Positiva realizada en 1999 -en Lincoln, Nebraska- se proyectaron cinco metas, entre las que se destaca la de elaborar programas que difundieran los conocimientos del emergente movimiento para la formación de futuros psicólogos. En la actualidad, se imparten cursos de Psicología Positiva en las principales universidades de los cincos continentes. La rápida difusión global es índice del interés despertado -tanto dentro como fuera de la ciencia psicológica- por la Psicología Positiva, último exponente y factor catalizador del llamado Enfoque Salugénico. La Universidad de Palermo cuenta con una década de experiencia en la enseñanza del Enfo…
Los estudios sobre calidad de vida y la perspectiva de la Psicología Positiva
2015
Las investigaciones sobre calidad de vida se desarrollaron a partir de la década del 70, si bien el antecedente del concepto data de los años 30 en Europa. En la actualidad, ha quedado establecido que la propuesta teórica de la calidad de vida alberga, como un paraguas, diferentes campos temáticos -la salud, el bienestar psicológico, el desarrollo económico, la vida social, las políticas públicas, la espiritualidad- comprendiendo dos dimensiones: la subjetiva y la objetiva. De esta manera, para estudiar y comprender la calidad de vida se requiere del aporte de diferentes disciplinas, convirtiéndose de esta manera en un concepto multidimensional. La psicología ha contribuido a la i…
Evaluadores de Psicodebate 14(1)
2015
Evaluadores de Psicodebate 14(1)
Hijos que tienen déficit de atención
2005
Se presentan datos preliminares obtenidos a través de una muestra en la que se aplicó un modelo de intervención psicosocial cognitivo-conductual-(TCC) de manejo parental grupal dentro del marco de las terapias breves, para padres de niños en edad escolar con conducta disruptiva (CD) y déficit atencional con y sin hiperactividad (TDAH). La experiencia se realiza en un Hospital General de la capital, con 8 familias que fueron referidas al programa. El marco teórico utilizado se basa en: 1- los problemas específicos que presentan los niños con déficit atencional con y sin hiperactividad y el stress considerable que impone a la familia hacer frente a las conductas disruptivas de estos …
Embodying Memories: The Women Rights Movement „#NiUnaMenos “ and the Women Narratives about State Repression in Argentina
2017
Desde 2015, un nuevo movimiento de derechos humanos lucha contra la violencia contra las mujeres:Ni una menos. Desde la perspectiva de los estudios culturales, existe un fuerte vinculo entre estas mujeres que luchan por la transformacion cultural y la duradera batalla contra el olvido llevada a cabo por el Movimiento Argentino de Derechos Humanos y, especialmente, por lasMadresy las Abuelasde PlazadeMayo. En el contexto del terrorismo de Estado y su literatura escrita por mujeres, esta contribucion refleja la metodologia para estudiar la literatura femenina de Argentina sobre la represion estataly tambien sobre el papel de las mujeres como agentes de transformacion social.
Fluorescent Biosensors Based on Silicon Nanowires
2021
Nanostructures are arising as novel biosensing platforms promising to surpass current performance in terms of sensitivity, selectivity, and affordability of standard approaches. However, for several nanosensors, the material and synthesis used make the industrial transfer of such technologies complex. Silicon nanowires (NWs) are compatible with Si-based flat architecture fabrication and arise as a hopeful solution to couple their interesting physical properties and surface-to-volume ratio to an easy commercial transfer. Among all the transduction methods, fluorescent probes and sensors emerge as some of the most used approaches thanks to their easy data interpretation, measure affordability…
Availability of extractives from various Norway spruce (Picea abies) stumps assortments
2022
Stumps and knotwood of Norway spruce (Picea abies) are valuable sources of wood extractives. Although lignans from knotwood have already been utilized in value-added products, the behavior and valorization of stump-derived extractives are less studied. In this study, the composition of lipophilic and hydrophilic extractives, particularly lignans, from various spruce stump samples (stump bottom, stump heart, and crushed stump samples) stored outside were studied. Lipophilic and hydrophilic extracts were separated with an accelerated solvent extraction (ASE) apparatus using n-hexane and hot water, respectively. The detailed extractives content of samples was then determined by gas chromatogra…
Combined effect of nutrient and flashing light frequency for a biochemical composition shift in Nannochloropsis gaditana grown in a quasi-isoactinic …
2020
Artificial lighting may be an interesting opportunity for the cultivation of microalgae as an alternative to natural sunlight. In particular, light emitting diodes (LEDs) can be employed to tailor the lighting to the microalgal culture in a controlled mode in order to create flashing light. In order to establish the effect of the flashing frequency on growth and biochemical composition of a model microalga, a quasi-isoactinic reactor, in which the light distribution is almost homogeneous, was set up. In this work, it was employed for the cultivation of the heterokont Nannochloropsis gaditana in two growth media with limiting and nonlimiting nutrients. The combined effect of nutrient concent…