196,309 research outputs found
La nova edat fosca
No full textTomas-Marquina, D.; Pastor Aguilar, M. (2021). La nova edat fosca. Quaderns d'Educació Contínua. (46):7-21. https://riunet.upv.es/handle/10251/189603S7214
Numeric simulation-based analysis of the mixing process in anaerobic digesters of biogas plants
No full textStirring systems with two rotational 3-bladed propellers were analyzed using computational fluid dynamic. The propellers are located at 3 heights and 7 angles in a tank with radius of 36 m. A fluid volume of 1400 m3 was considered. 441 mixing configurations were evaluated. The fluid was characterized by non-Newtonian rheology and was simulated using the k-ε turbulence model and the standard k-ω model. Reynolds numbers were estimated. High fluid speeds were obtained with the propellers located at a height of 2 m and oriented at 90° with respect to the tank radius. In the top regions of the tank the fluid velocity was generally less intense and less affected by the angle setting. The configurations identified as good mixing systems showed power consumptions broadly distributed around 30 kW
MAURIAC ET FOSCA DANS LA VIE LITTÉRAIRE - 1925
No full textLe Désert de l’Amour, par François Mauriac (1 vol., Grasset). – La Berlue, par François Fosca (1 vol., Le Divan). C’est un âpre et beau livre que ce Désert de l’Amour où s’attestent les fortes qualités de romancier dont avait déjà fait preuve M. François Mauriac dans le Baiser au Lépreux et dans le Fleuve de feu. Ainsi que nous avions suivi M. Mauriac sur les rives où la passion roule ses ondes ardentes, accompagnons-le dans les sables brûlants où elle s’égare aux côtés du désir qui la des..
Environmental characterization of the municipality of Fosca, Cundinamarca, in the context of food sovereignty and security
No full textLa presente pasantía se desarrolló en el marco del proyecto de investigación “Inclusión y reconocimiento de la diversidad y diferencia cultural en la educación científica, mediante innovaciones educativas que propicien el diálogo entre conocimientos científicos académicos (CCA) y tradiciones locales (CTL) en y para comunidades rurales. Estudios de caso: Fosca y Fómeque”, financiado por el Ministerio de Ciencia, Tecnología e Innovación – MinCiencias. El eje de trabajo se centró en la caracterización del componente ambiental del municipio de Fosca (Cundinamarca), a partir de herramientas teóricas y metodológicas que permitieran identificar factores de vulnerabilidad y problemáticas asociadas a la seguridad alimentaria, tal como se establece en el objetivo general de la pasantía. En un contexto global donde más de 735 millones de personas padecen hambre (FAO, 2023), y donde el cambio climático, la degradación del suelo y la pérdida de biodiversidad comprometen la sostenibilidad de los sistemas alimentarios (IPCC, 2022), el estudio de estos factores en territorios rurales resulta urgente y pertinente. Fosca es un municipio de vocación agropecuaria ubicado en la provincia del Oriente de Cundinamarca. Presenta desafíos asociados a la erosión de suelos, presión sobre fuentes hídricas y variabilidad climática, que afectan la producción agrícola y, por ende, la seguridad alimentaria de sus habitantes (Alcaldía de Fosca, 2024; Gobernación de Cundinamarca, 2023). Esta situación se agrava por el abandono progresivo del campo y la transformación de patrones de consumo (Rincón, 2020), lo cual debilita la autonomía alimentaria campesina y acentúa la dependencia de mercados externos. Con el fin de aportar herramientas para el análisis territorial, se empleó un enfoque metodológico mixto basado en el Mapeamiento Informacional Bibliográfico (MIB) (Ferreira & Souza, 2020), la aplicación de la Matriz de Leopold (Conesa, 2015) y el uso de Sistemas de Información Geográfica (SIG) (IGAC, 2022). Esta combinación metodológica permitió construir una visión integral de las relaciones entre ambiente prácticas agrícolas y acceso a alimentos, orientando así la formulación de estrategias para la gestión ambiental sostenible en contextos rurales. Durante el proceso, se participó en actividades investigativas, análisis cartográfico, sistematización de impactos y socialización de avances en espacios académicos. Esta pasantía representa un resultado concreto del proyecto institucional, aportando evidencias empíricas para el diseño de propuestas educativas y técnicas que articulen el conocimiento científico con las realidades territoriales rurales.This internship was developed within the framework of the research project "Inclusion and recognition of diversity and cultural difference in science education, through educational innovations that foster dialogue between academic scientific knowledge (ASC) and local traditions (LT) in and for rural communities. Case studies: Fosca and Fómeque," funded by the Ministry of Science, Technology and Innovation (MinCiencias). The focus of work focused on the characterization of the environmental component of the municipality of Fosca (Cundinamarca), based on theoretical and methodological tools that allowed the identification of vulnerability factors and problems associated with food security, as established in the general objective of the internship. In a global context where more than 735 million people suffer from hunger (FAO, 2023), and where climate change, soil degradation, and biodiversity loss compromise the sustainability of food systems (IPCC, 2022), the study of these factors in rural territories is urgent and relevant. Fosca is a municipality with an agricultural vocation located in the province of Oriente, Cundinamarca. It faces challenges associated with soil erosion, pressure on water sources, and climate variability, which affect agricultural production and, consequently, the food security of its inhabitants (Mayor's Office of Fosca, 2024; Government of Cundinamarca, 2023). This situation is aggravated by the progressive abandonment of the countryside and the transformation of consumption patterns (Rincón, 2020), which weakens peasant food autonomy and accentuates dependence on external markets. In order to provide tools for territorial analysis, a mixed methodological approach was used based on Bibliographic Information Mapping (BIM) (Ferreira & Souza, 2020), the application of the Leopold Matrix (Conesa, 2015), and the use of Geographic Information Systems (GIS) (IGAC, 2022). This methodological combination allowed for the development of a comprehensive view of the relationships between the environment, agricultural practices, and access to food, thus guiding the formulation of strategies for sustainable environmental management in rural contexts. During the process, the internship involved research, cartographic analysis, impact systematization, and the dissemination of progress in academic settings. This internship represents a concrete outcome of the institutional project, providing empirical evidence for the design of educational and technical proposals that articulate scientific knowledge with rural territorial realities
Information diffusion in complex networks: The active/passive conundrum
No full textIdeas, information, viruses: all of them, with their mechanisms, can spread over the complex social tissues described by our interpersonal relations. Classical spreading models can agnostically from the object of which they simulate the diffusion, thus considering spreading of virus, ideas and innovations alike. Indeed, such simplification makes easier to define a standard set of tools that can be applied to heterogeneous contexts; however, it can also lead to biased, partial, simulation outcomes. In this work we discuss the concepts of active and passive diffusion: moving from analysis of a well-known passive model, the Threshold one, we introduce two novel approaches whose aim is to provide active and mixed schemas applicable in the context of innovations/ideas diffusion simulation. Our data-driven analysis shows how, in such context, the adoption of exclusively passive/active models leads to conflicting results, thus highlighting the need of mixed approaches
Doped calcium phosphate bone cements and real-time monitoring of their hardening mechanism
No full textNowadays, considerable efforts have been focused on various calcium phosphate
based cement compositions (CPC), developed to restore the damaged human hard
tissues, like vertebras and osteoporotic bone. Furthermore, CPC materials are widely
used as synthetic substitutes for non-load bearing fractures, bone defects and teeth
reconstruction, due to their chemical similarity to the mineral component of the
natural hard tissue. However, the proposed up to now cement formulations can be
improved by endowing cements with additional properties, requested for a certain
application field. For example, the bone graft associated infections can be prevented
by doping the synthetic materials with Ag+ ions at low (non cytotoxic) concentrations.
This way seems to be more appropriate, because the antimicrobial agents could be
provided directly at the implantation site. Another interesting functionalization option
are Zn2+ ions - an essential trace element participating in a variety of cellular processes,
including DNA synthesis, behavioural responses, bone formation and growth and
wound healing. Moreover, zinc plays an important role in gene expression and in
the regulation of cellular growth and differentiation. To this end, Zn2+ is known to
possess antibacterial, osteo- and angiogenetic properties, enhancing the proliferation
of osteoblastic cells.
The aim of this research is to develope functionalized cements for several bone
grafting applications, among them those mentioned above. In order to monitor in real time
all these processes, the Energy Dispersive X-Ray Diffraction (EDXRD)
technique is applied, being very suitable for this task
EPR and Time Resolved EPR of synthetic eumelanins
No full textEumelanins are the fundamental components of the mammalian pigmentary system. Their
biological functions, in all the different localization, e.g. the skin or the retinal pigment epithelium,
are influenced by uncommon physicochemical features [1]. Eumelanin properties include a
permanent EPR signal due to a number of intrinsic quinone/semiquinone like radicals and a
reversibly generated EPR signal under UV and visible irradiation, that suggests the formation of
additional extrinsic radicals. Recently, TR-EPR studies have demonstrated that in the
photoproduction of new melanin free radicals, they are generated as Radical Pairs from the triplet
manifold [2]. Here, we compare photoreactivity of a synthetic eumelanins as function of the
temperature in the range 290-140K. Moreover, we analyze the electron spin polarization of the EPR
signal in the presence and in the absence of oxygen. TR-EPR spectra of samples under vacuum
exhibit only a net emission after the exciting laser pulse, while for sample in equilibrium with
oxygen in the air an additional distinct pattern consisting of an enhanced absorption followed by
emission is present at the earliest times (delay<1ms). It is possible that the spin photochemistry of
melanin determines its observable photoreactivity
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