Ara es mostren els items 39697-39716 de 89942

  • Fatigue performance improvement of electrical discharge machined hardmetals by means of combined thermal annealing and surface modification routes 

    Llanes Pitarch, Luis Miguel; Casas Aguirregomezcorta, Begoña; Salán Ballesteros, Maria Núria; Mestra Rodríguez, Álvaro Miguel; Torres Hernández, Yadir (2013-01)
    Article
    Accés restringit per política de l'editorial
    Electrical discharge machining (EDM) provides an effective means of shaping hardmetals. However, it is also known that surface integrity of these materials may be affected by EDM, degrading their tribomechanical characteristics. ...
  • Fatigue propagation of long cracks in metastable austenitic stainless steels 

    Martelo, D.F.; Mateo García, Antonio Manuel; Fargas Ribas, Gemma; Chapetti, M.D. (2013)
    Text en actes de congrés
    Accés obert
    Fatigue crack growth of a metastable austenitic stainless steel was investigated in thin specimen under positive stress ratio. Annealed and Co l d rolled conditions were used to test the influence of the microstructure. ...
  • Fatigue properties of duplex stainless steel 

    Turrel, Benjamin; Luna Garcia, Jordi; Andraschko, Stephan (Universitat Politècnica de Catalunya, 2009-12-02)
    Projecte/Treball Final de Carrera
    Accés obert
    Realitzat a/amb:  Høgskolen i Oslo
    The aim of the project is to study fatigue properties of duplex stainless steel used for a bridge. The samples had to be tested and the results have to be compared with the theory, studied before. Six specimens have been ...
  • Fatigue Properties of Tungsten Heavy Alloys IT180 and D176 

    Miralda López, Marc (Universitat Politècnica de Catalunya / Lunds Tekniska Högskola, 2010)
    Projecte/Treball Final de Carrera
    Accés obert
    Fatigue properties of the tungsten-based alloys IT180 (W-3.5Ni-1.5wt%Cu) and D176 (W-5Ni-2.5wt%Fe) have been determined using constant amplitude stress-controlled fatigue tests. These tests were performed at room temperature ...
  • Fatigue strength of cold-work tool steels: microstructure – critical flaw correlation 

    Goez, Alexey; Picas Anfruns, Ingrid; Valls, I.; Casas, B.; Casellas Padró, Daniel; Llanes Pitarch, Luis Miguel (2009)
    Comunicació de congrés
    Accés restringit per política de l'editorial
  • Fatigue susceptibility under contact loading of hardmetals coated with ceramic films 

    Llanes Pitarch, Luis Miguel; Tarrés, E.; Ramírez, Giselle; Botero Vega, Carlos Alberto; Jiménez Piqué, Emilio (2010-04)
    Article
    Accés restringit per política de l'editorial
    The contact fatigue behavior of a fine-grained hardmetal coated with two distinct ceramic films, either a TiN monolayer or a WC/C multilayer, is studied by means of indentation testing techniques. Spherical indentation ...
  • Fatigue testing and properties of hardmetals in the gigacycle range 

    Kotas, Agnieszka Betzwar; Danninger, Herbert; Weiss, Brigitte; Mingard, K.P.; Sánchez, José; Llanes Pitarch, Luis Miguel (2017-01-01)
    Article
    Accés restringit per política de l'editorial
    Hardmetal products are frequently fatigue loaded in service, such as e.g. cutting tools for milling or percussion drills. In the present work, the fatigue behaviour of hardmetals was investigated into the gigacycle range ...
  • FaTLease: scalable fault-tolerant lease negotiation with Paxos 

    Hupfeld, Felix; Kolbeck, Björn; Stender, Jan; Högqovist, Mikael; Cortés, Toni; Marti, Jonathan; Malo, Jesús (2008-06)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    A lease is a token which grants its owner exclusive access to a resource for a defined span of time. In order to be able to tolerate failures, leases need to be coordinated by distributed processes. We present FaTLease, ...
  • Fatores de incentivo à servitização através da integração do serviço ao cliente no processo de desenvolvimento de produtos 

    Azpiazu Auguet, Alejandra (Universitat Politècnica de Catalunya / Universidade Federal do Rio Grande do Sul, 2014)
    Treball Final de Grau
    Accés obert
    Realitzat a/amb:  Universidade Federal do Rio Grande do Sul
    O Desenvolvimento de Produto (DP) ganhou o posto de processo contínuo dentro das organizações em função do baixo ciclo de vida dos produtos no mercado. Este processo é realizado por times multidisciplinares, mas a área de ...
  • Fatty oil hydrogenation in supercritical solvents: process design and safety issues 

    Ramírez Rangel, Eliana; Mayorga Cárdenas, Miguel Yuri; Cuevas, Daniel; Recasens Baxarías, Francisco Javier (2011-03-02)
    Article
    Accés restringit per política de l'editorial
    A simulation study of a SCF process is carried out using Aspen™ with previously available catalytic kinetics for the simulation of the reactor. Two supported catalysts were considered: a standard Pd/carbon, and an egg-shell ...
  • Fault detection and automatic supervision methodology for PV systems 

    Silvestre Bergés, Santiago; Chouder, Aissa (2010)
    Text en actes de congrés
    Accés obert
    In this work, we show a new methodology for automatic supervision and fault detection of PV Systems, based mainly on the analysis of the power losses. This methodology includes parameter extraction techniques to calculate ...
  • Fault detection and isolation based on the combination of a bank of interval observers and invariant sets 

    Xu, Feng; Stoican, Florin; Puig Cayuela, Vicenç; Ocampo-Martínez, Carlos; Olaru, Sorin (2013)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    In this paper, a fault detection and isolation (FDI) approach using a bank of interval observers is developed. From the methodological point of view, a bank of interval observers is designed according to different dynamical ...
  • Fault detection and isolation for a wind turbine benchmark using a mixed Bayesian/set-membership approach 

    Fernández Canti, Rosa M.; Blesa Izquierdo, Joaquim; Tornil Sin, Sebastián; Puig Cayuela, Vicenç (2015-10-30)
    Article
    Accés obert
    This paper addresses the problem of fault detection and isolation of wind turbines using a mixed Bayesian/Set-membership approach. Modeling errors are assumed to be unknown but bounded, following the set-membership approach. ...
  • Fault detection and isolation in critical infrastructure systems 

    Puig Cayuela, Vicenç; Escobet Canal, Teresa; Sarrate Estruch, Ramon; Quevedo Casín, Joseba Jokin (2014)
    Text en actes de congrés
    Accés obert
    Critical infrastructure systems (CIS) are complex large-scale systems which in turn require highly sophisticated supervisory control systems to ensure that high performance can be achieved and maintained under adverse ...
  • Fault detection and isolation of a real PEM fuel cell using interval LPV observers 

    Lira Ramírez, Salvador de; Puig Cayuela, Vicenç; Quevedo Casín, Joseba Jokin (IFAC, 2012)
    Text en actes de congrés
    Accés restringit per decisió de l'autor
    The purpose of this paper is to design a Fault Detection and Isolation (FDI) system based on interval LPV observers with application to a real fuel cell. The interval LPV observer is used to generate an adaptive threshold ...
  • Fault detection and isolation of a real wind turbine using LPV observers 

    Negre, Pep Lluís; Puig Cayuela, Vicenç; Pineda, Isaac (2011)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    The purpose of this paper is to design a Fault Detection and Isolation (FDI) system based on LPV observers with application to a real wind turbine. The LPV observer is used to generate an adaptive threshold to enhance the ...
  • Fault detection and isolation of hybrid systems using diagnosers that reason on components 

    Vento Maldonado, Jorge; Puig Cayuela, Vicenç; Sarrate Estruch, Ramon; Travé-Massuyés, Louise (2012)
    Text en actes de congrés
    Accés restringit per decisió de l'autor
    In this paper, a design methodology and implementation architecure for diagnosers in the framework of hybrid systems is proposed. The design methodo logy is based on the hybrid automata model that represents the system ...
  • Fault detection and isolation of inland navigation channel: application to the Cuinchy-Fontinettes reach 

    Duviella, Eric; Rajaoarisoa, Lala H.; Blesa Izquierdo, Joaquim; Chuquet, Karine (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Text en actes de congrés
    Accés obert
    Inland navigation networks are mainly used for transport with economic and environmental benefits. In a climate change context which leads to the scarcity of the water resource, the control of navigation levels and the ...
  • Fault Detection and Isolation of Wind Turbines - A Real Field Data Approach 

    Negre Carrasco, Pep Llu ís (Universitat Politècnica de Catalunya, 2010-09)
    Projecte Final de Màster Oficial
    Accés obert
    The future of wind energy passes through the installation of o shore wind farms. In such locations a non-planned maintenance is highly costly, therefore, a fault-tolerant control system that is able to maintain the ...
  • Fault Detection and Isolation of Wind Turbines: Application to a Real Case Study 

    Negre, Pep Lluís; Puig Cayuela, Vicenç; Pineda, Isaac (2010)
    Text en actes de congrés
    Accés obert