Compendio della vita della B. Madre Teresa del Giesv

Copia digital. Valladolid : Junta de Castilla y León. Consejería de Cultura y Turismo, 2013Marca tip. en port.Port. con orla tip.Sign.: [cruz latina]\4\s, A-I\8\s, K\4\s

Estudo das linhas de campo magnético em um tokamak com divertor

Orientador: Prof. Dr. Ricardo Luiz VianaCoorientador: Dra. Amanda Carolina Mathias SiementkowskiTrabalho de Conclusão de Curso (Graduação) - Universidade Federal do Paraná, Setor de Ciências Exatas, Curso de Graduação em Física.Inclui referênciasResumo : A deposição de linhas de campo magnético de um tokamak com divertor pode ser representado por um sistema dinâmico físico, neste caso, um sistema hamiltoniano aberto, que tem como característica o surgimento frequente de estruturas fractais. Neste trabalho usamos um mapa simples para investigar os padrões de deposição nas placas de um tokamak com divertor. Mostramos que o padrão das pegadas magnéticas nas placas do divertor (padrões de deposição) próximas às órbitas caóticas envolvem estruturas fractais relacionadas à existência de um conjunto de selas caóticas.Abstract: The deposition of magnetic field lines of a tokamak with divertor can be represented by a physical dynamic system, in this case, an open Hamiltonian system, which is characterized by the frequent appearance of fractal structures. In this work we use a simple map to investigate deposition patterns on the plates of a divertor tokamak. We show that the pattern of magnetic footprints on the divertor plates (deposition patterns) close to the chaotic orbits involve fractal structures related to the existence of a set of chaotic saddles

Innovative, green, floating radiosondes to track small-scale fluctuations along isopycnic surfaces in and around warm clouds

Clouds are an important source of uncertainty in climate modelling and weather prediction models. Warm clouds have a cloud top that doesn’t contain any ice forms and are found to be responsible for 31% of the world’s rainfall. Hence, innovative, green, ultralight radiosondes are being conceived within the context of the H2020 MSCA ITN ClOud-MicroPhysics-turbuLEnce-Telemetry (COMPLETE) network, which aims to characterise the cloud boundary, and develop the current understanding of cloud physics and related turbulent dynamics. The radiosondes conceived within this network will contribute to the current understanding of microphysical processes in clouds in a range of a few 100m

Design for green, disposable, mini radiosondes to track fluctuations along isopycnic surfaces in cloud environments

An introduction to innovative, bio-compatible, ultralight, disposable radiosondes that are aimed to be passively transported on isopycnic surfaces in cloud and clear air environments. Their goal is to track small-scale fluctuations of velocity, temperature, humidity, acceleration and pressure for several hours within and outside the cloud boundary. With a target weight of 15 g, the volume is chosen such that the probes float on isopycnic surfaces at constant altitudes from 1000 to 3000 m. They are filled with helium gas to obtain a buoyancy force equal to the weight of the system. Transmitters within the probes will send data to receivers on Earth to be analysed and compared with numerical simulations. To minimise their environmental impact, it is foreseen that the disposable radiosondes be made with biodegradable smart materials which keep the desired hydrophobicity and flexibility. These environmentally friendly, hydrophobic balloons will provide an insight into the unsteady life cycle of warm clouds over land, ocean and alpine environments. These explorative observations will contribute to the current understanding of microphysical processes in clouds with the purpose of improving weather prediction and climate modelling

Evaluation of Mater Bi and Polylactic Acid as materials for biodegradable innovative mini-radiosondes to track small scale fluctuations within clouds

Turbulence plays an important part in determining the chemical and physical processes, on both the micro- and macro-scales, whereby clouds are formed and behave. However, exactly how these are linked together and how turbulence impacts each of these processes is not yet fully understood. This is partly due to a lack of in-situ small scale fluctuation measurements due to a limitation in the available technology. It is in this context that the radiosondes, for which the material characterisation is presented in this paper, are being developed to generate a Lagrangian set of data which can be used to improve the ever-expanding knowledge of atmospheric processes and, in particular, the understanding of the interaction between turbulence and micro-physical phenomenologies inside clouds (www.complete-h2020network.eu). Specifically, the materials developed for the balloons are discussed in further detail within this paper. Mater Bi and polylactic acid are the two common biodegradable thermoplastics that were used initially to make the balloons. To tailor their properties, the balloons were then coated with carnauba wax blended with either pine resin or SiO_2 nanoparticles. The properties such as hydrophobicity, toughness, elasticity and helium gas permeability are investigated and improved in order to keep the density of the radiosondes as constant as possible for a couple of hours. This will allow them to float inside and outside clouds on an isopycnic surface, to measure various properties such as velocity, temperature, pressure and humidity by means of solid state sensors and to transmit them to receivers on Earth. Tests have been made under a rigorous metrological approach comparing the 6 new materials with two reference balloon materials, latex and mylar. It was found that Mater Bi with the two carnaubua wax coatings is the most suited.

Disposable radiosondes for tracking Lagrangian fluctuations inside warm clouds

Clouds are a weak link in modelling atmospheric circulation as they depend on interdisciplinary processes ranging from collisions of micron-sized droplets and particles to airflow dynamics on the kilometre scale. The uncertainty in cloud representation and hence climate modelling and weather prediction justifies the need for more explorative observations. A new way of tracking Lagrangian fluctuations inside warm clouds has been proposed as part of the Horizon 2020 Innovative Training Network ClOud-MicroPhysics- turbuLEnce-TElemetry project. Part of the project aims to design a new kind of ultralight radio probe capable of floating in stratocumuli clouds. The probes presented in this paper will be environmentally friendly and will allow the generation of a Lagrangian database for small-scale fluctuations inside warm clouds

Silk fibroin microgels as a platform for cell microencapsulation

: Cell microencapsulation has been utilized for years as a means of cell shielding from the external environment while facilitating the transport of gases, general metabolites, and secretory bioactive molecules at once. In this light, hydrogels may support the structural integrity and functionality of encapsulated biologics whereas ensuring cell viability and function and releasing potential therapeutic factors once in situ. In this work, we describe a straightforward strategy to fabricate silk fibroin (SF) microgels (µgels) and encapsulate cells into them. SF µgels (size ≈ 200 µm) were obtained through ultrasonication-induced gelation of SF in a water-oil emulsion phase. A thorough physicochemical (SEM analysis, and FT-IR) and mechanical (microindentation tests) characterization of SF µgels were carried out to assess their nanostructure, porosity, and stiffness. SF µgels were used to encapsulate and culture L929 and primary myoblasts. Interestingly, SF µgels showed a selective release of relatively small proteins (e.g., VEGF, molecular weight, MW = 40 kDa) by the encapsulated primary myoblasts, while bigger (macro)molecules (MW = 160 kDa) were hampered to diffusing through the µgels. This article provided the groundwork to expand the use of SF hydrogels into a versatile platform for encapsulating relevant cells able to release paracrine factors potentially regulating tissue and/or organ functions, thus promoting their regeneration

Impact of space-time mesh adaptation on solute transport modeling in porous media

open4siWe implement a space-time grid adaptation procedure to efficiently improve the accuracy of numerical simulations of solute transport in porous media in the context of model parameter estimation. We focus on the Advection Dispersion Equation (ADE) for the interpretation of non-reactive transport experiments in laboratory-scale heterogeneous porous media. When compared to a numerical approximation based on a fixed space-time discretization, our approach is grounded on a joint automatic selection of the spatial grid and the time step to capture the main (space-time) system dynamics. Spatial mesh adaptation is driven by an anisotropic recovery-based error estimator which enables us to properly select the size, shape and orientation of the mesh elements. Adaptation of the time step is performed through an ad-hoc local reconstruction of the temporal derivative of the solution via a recovery-based approach. The impact of the proposed adaptation strategy on the ability to provide reliable estimates of the key parameters of an ADE model is assessed on the basis of experimental solute breakthrough data measured following tracer injection in a non-uniform porous system. Model calibration is performed in a Maximum Likelihood (ML) framework upon relying on the representation of the ADE solution through a generalized Polynomial Chaos Expansion (gPCE). Our results show that the proposed anisotropic space-time grid adaptation leads to ML parameter estimates and to model results of markedly improved quality when compared to classical inversion approaches based on a uniform space-time discretization.openEsfandiar, B; Porta, G; Perotto, S; Guadagnini, AESFANDIAR JAHROMI, Bahman; Porta, GIOVANNI MICHELE; Perotto, Simona; Guadagnini, Albert