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Study of the Business Model of three Earth Observation (EO) companies already present in the Very Low Earth Orbit market (VLEO)

  • Gutiérrez Baena, Juan Felipe
The emergence of a new private spaceflight industry has taken the Earth Observation (EO) sector by surprise. NewSpace companies are challenging the traditional satellite sector by addressing their services to mass market requirements of high-quality and low-cost EO. As part of the DISCOVERER project, this study aims to determine the Key Success Factors to consider by a new EO company at Low Earth Orbit (LEO). Hence, three businesses fitting the description were analyzed with the Case Study Methodology to establish their Business Model Canvas (BMC), associated Patterns, and Key Success Factors. The investigation consolidated the newly proposed Democratizing Business Model Pattern and added new characteristics. Successful EO NewSpace firms are getting divided between integrated operators, integrated manufacturers, and end-user specialists. A new EO company should consider the Democratizing Pattern success factors and the Vertically Integrated Strategies (VIS), depending on its disruptive idea and resource capabilities. Further research is needed to identify new factors, strengthen the validity of the Pattern, and VIS tendencies.
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Metodologia de càlcul de provisions d'un banc

  • Sabata Coromina, Eloi
La pèrdua creditícia esperada consisteix en la pèrdua que experimenta una entitat bancària degut als impagaments que pugui patir per part dels seus clients. Aquesta pèrdua creditícia esperada s’ha d’intentar estimar per tal de que les entitats bancàries la puguin reflectir en el seu exercici i presentar el seu compte de resultats reflectint dites pèrdues estimades. L’estimació de la pèrdua creditícia d’una entitat bancària ha patit una gran evolució al llarg del últims anys, especialment motivada pel la gran crisi financera mundial iniciada el 2007 [1], en la que moltes entitats bancaries no tenien l’obligació d’adjudicar-se una pèrdua fins que aquesta efectivament s’havia donat. Posteriorment a aquesta crisi, es va modifica la llei de regulació financera que hi havia al moment per treure unes noves directrius, en les quals, obligaven a les entitats bancaries a predir les seves pèrdues per impagaments i a comptabilitzar-se-les anualment. Així doncs, es donarà una visió global del punts més importants d’aquesta nova normativa, la IFRS9, amb especial èmfasi als punts que afecten amb major mesura l’estimació de la pèrdua creditícia esperada ja que, és aquesta, la que s’acaba imputant com a provisió per la pèrdua creditícia. Degut a que el càlcul de la pèrdua creditícia esperada es basa amb els quatre principals paràmetres bancaris que defineixen la pèrdua o impagament d’una operació, també s’explicarà el significat d’aquests paràmetres: Definició del default, Probabilitat de d’impagament, Severitat i Exposició a l’impagament. Tanmateix, es crearà una possible metodologia de càlcul que podria utilitzar una entitat bancària per calcular la seva pèrdua creditícia esperada. Aquesta metodologia es realitzarà a nivell teòric per les tres principals components de la pèrdua creditícia: Probabilitat d’impagament, Severitat i Exposició a l’impagament. Al tractar-se d’un projecte teòric que pretén acostar a tots els nivells la teoria de regulació bancaria deguda a la pèrdua creditícia esperada, es prendran certes dades, que les entitats han d’estimar, com a dades donades. D’aquesta manera es pretén poder donar més èmfasi a la metodologia de càlcul de la pèrdua creditícia esperada, i no a les estimacions de paràmetres auxiliars, que provenen de l’anàlisi de variables macroeconòmiques, i que es consideren fora de l’abast de la IFRS9.
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Caracterització quimicomineral de l’aigua de les fonts del Montseny selvatà

  • Farrerons Vidal, Óscar
Between November 2018 and January 2019, we analysed mineralogical water from seventy-five springs of Montseny (La Selva region, Catalonia) using techniques of analysis ofpotentiometry, conductimetry, acid-base volumetry, Mohr volumetry, turbidimetry, UV spectrophotometry, complexometric and flame photometry. The statistical analysis of the data obtained shows that the Montseny (La Selva region) global mineralization of water from the sources is low, although there are particular cases due to specific circumstances, usually related to local anthropic or lithological issues. In the study area it has been found that the altitude of the source is a fairly reliable indicator of the degree of mineralization. The major ions are bicarbonate and calcium and, to a small quantity, sodium. Regarding nitrate pollution, it is shown that the water is of high quality, since only 4% of the sources analysed exceed the 50 mg/l established in the RD 140/2003 as limit for drinking water.
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Mathematical equivalence between time-dependent single-rate and multirate mass transfer models

  • Fernández García, Daniel
  • Sánchez Vila, Francisco Javier
The often observed tailing of tracer breakthrough curves is caused by a multitude of mass transfer processes taking place over multiple scales. Yet, in some cases, it is convenient to fit a transport model with a single-rate mass transfer coefficient that lumps all the non-Fickian observed behavior. Since mass transfer processes take place at all characteristic times, the single-rate mass transfer coefficient derived from measurements in the laboratory or in the field vary with time w(t). The literature review and tracer experiments compiled by Haggerty et al. (2004) from a number of sites worldwide suggest that the characteristic mass transfer time, which is proportional to w(t)^-1, scales as a power law of the advective and experiment duration. This paper studies the mathematical equivalence between the multirate mass transfer model (MRMT) and a time-dependent single-rate mass transfer model (t-SRMT). In doing this, we provide new insights into the previously observed scale-dependence of mass transfer coefficients. The memory function, g(t), which is the most salient feature of the MRMT model, determines the influence of the past values of concentrations on its present state. We found that the t-SRMT model can also be expressed by means of a memory function \phi(t,\tau). In this case, though the memory function is nonstationary, meaning that in general it cannot be written as \phi(t-\tau). Nevertheless, the full behavior of the concentrations using a single time-dependent rate w(t) is approximately analogous to that of the MRMT model provided that the equality w(t) = -dlng(t)/dt holds and the field capacity is properly chosen. This relationship suggests that when the memory function is a power law, g(t) \approx t^{1-k}, the equivalent mass transfer coefficient scales as w(t) \approx t^-1, nicely fitting without calibration the estimated mass transfer coefficients compiled by Haggerty et al. (2004)., Peer Reviewed
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Hydraulic fracture during epithelial stretching

  • Casares, Laura
  • Vincent, Romaric
  • Zalvidea, Dobryna
  • Campillo, Noelia
  • Navajas, Daniel
  • Arroyo Balaguer, Marino
  • Trepat Guixer, Xavier
The origin of fracture in epithelial cell sheets subject to stretch is commonly attributed to excess tension in the cells' cytoskeleton, in the plasma membrane, or in cell-cell contacts. Here, we demonstrate that for a variety of synthetic and physiological hydrogel substrates the formation of epithelial cracks is caused by tissue stretching independently of epithelial tension. We show that the origin of the cracks is hydraulic; they result from a transient pressure build-up in the substrate during stretch and compression manoeuvres. After pressure equilibration, cracks heal readily through actomyosin-dependent mechanisms. The observed phenomenology is captured by the theory of poroelasticity, which predicts the size and healing dynamics of epithelial cracks as a function of the stiffness, geometry and composition of the hydrogel substrate. Our findings demonstrate that epithelial integrity is determined in a tension-independent manner by the coupling between tissue stretching and matrix hydraulics., Peer Reviewed
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An adaptive design of an all-zero spectral estimator

  • Lagunas Hernandez, Miguel A.
  • Figueiras Vidal, Aníbal R.
  • Mariño Acebal, José Bernardo
Peer Reviewed
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Estudi bibliomètric any 2015. EETAC

  • Universitat Politècnica de Catalunya. Campus del Baix Llobregat. Biblioteca
El present document recull les publicacions indexades a la base de dades Scopus durant el període comprès entre el mesos de gener a desembre de l’any 2015, escrits per autors pertanyents a l’EETAC. Es presenten les dades recollides segons la font on s’ha publicat, els autors que han publicat, i el tipus de document publicat. S’hi inclou un annex amb la llista de totes les referències bibliogràfiques publicades.
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Bit-slice implementation of a linear predictive vocoder

  • Vázquez Grau, Gregorio
  • Gasull Llampallas, Antoni
A digital 16-bit high-speed general-purpose signal-processor is shown. The main objective has been the implementation of a linear predictive vocoder for obtaining real-time speech compression. For real-time digital speech processing, fast devices and special procedure designs are needed. Thus, in obtaining high speed processors, multi-data paths, parallel and pipeline arquitectures have been adopted., Peer Reviewed
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Implementation of systolic algorithms using pipelined functional units

  • Valero García, Miguel
  • Navarro Guerrero, Juan José
  • Llaberia Griñó, José M.
  • Valero Cortés, Mateo
The authors present a method to implement systolic algorithms (SAs) using pipelined functional units (PFUs). This kind of unit makes it possible to improve the throughput of a processor because of the possibility of initiating a new operation before the previous one has been completed. The method permits transformation of a SA so that it can be efficiently executed using PFUs. The method is based on two temporal transformations (slowdown and retiming) and one spatial transformation (coalescing). The temporal transformations permit the modification of the SA in such a way that dependences established by the PFU are preserved. The spatial transformation improves the hardware utilization. The method was applied to 1-D SAs with data contraflow. To demonstrate the effectiveness of the method, the authors describe an efficient implementation of a non-time-homogeneous SA with data contraflow for QR decomposition
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