Universitat Politècnica de Catalunya: Recent submissions
Now showing items 1701-1720 of 5879
Livelihood strategies and risk behavior of cacao producers in Ecuador : effects of national policies to support cacao farmers and specialty cacao landraces
This thesis addresses the Ecuadorian cacao value chain through three interrelated chapters. Small producers linked to this chain face significant trade-offs between the two main available varieties for planting: the fine ...
Dynamics of marine dissolved organic matter : ocean metabolism and climate transitions
The Global Ocean is the largest Earth compartment holding carbon and nutrients that reaches the upper-ocean at temporal scales ranging from months to 10 kyr. The availability of these nutrients is fundamental to sustain ...
Advanced carbon capture and storage technologies
In this work two research topics are presented: investigation of carbonation reactions of high – calcium waste materials and CO2 storage in coal. Firstly, sorption capacity of CO2 and CH4 of hard coal and associated ...
Efficient computational mesoscale modeling of concrete under cyclic loading
Concrete is a complex material and can be modeled on various spatial and temporal scales. While simulations on coarse scales are practical for engineering applications, a deeper understanding of the material is gained on ...
The effectiveness of knowledge and technology transfer through university-business collaboration in science parks
Science and Technology Parks (STPs) facilitate the flow of knowledge and technology among universities; R&D institutions; companies and markets, and foster the creation and growth of innovation-based companies. Among the ...
Characterization of damage evolution on metallic components using ultrasonic non-destructive methods
When fatigue is considered, it is expected that structures and machinery eventually fail. Still, when this damage is unexpected, besides of the negative economic impact that it produces, life of people could be potentially ...
Computational vademecums for lattice materials using algebraic PGD
This dissertation is motivated by the concept of materials by design. Focusing on structures, this states that the properties in a mechanical component are not only inherited by its constituent material, but also by the ...
Dissecting HTTP/2 and QUIC : measurement, evaluation and optimization
The Internet is evolving from the perspective of both usage and connectivity. The meteoric rise of smartphones has not only facilitated connectivity for the masses, it has also increased their appetite for more responsive ...
Design of reliable schedules and control strategies for improving bus system performance
High-level service bus systems, even though in many different forms and local particularities, have been spread out around the globe over the last decades, driven by the administration and the transport authority, and in ...
Millimeter wave band reconfigurable circuits (from 30 to above 100 GHz) in BiCMOS-MEMS technology
Actualment hi ha un ús creixent de dispositius mòbils i de la necessitat d’informació i, per això, cada vegada es necessiten sistemes sense fils amb majors velocitats de dades i més amplada de banda. A més, els sistemes ...
Estudio de la energía específica consumida en el rectificado
To contribute in the increase of the productivity and to the energetic saving in companies, the present thesis focuses the investigation on the process of grinding. The energetic efficiency grinding one depends on the ...
ENGAGE-DEM : a model of engagement of people with dementia
Dementia is a neurodegenerative disease that affects cognition, producing a reduction in thinking, problem-solving, and mnemonic abilities, functioning, preventing affected people to care for themselves and carry out ...
The innovative expression of Chinese traditional culture and art in contemporary architectural design
Recent improvements in contemporary Chinese society will not only be reflected by new economic models, cultural products, scientific and technological achievements and aesthetic values, but also manifest in diverse ...
Impulsive noise cancellation and channel estimation in power line communication systems
Power line communication (PLC) is considered as the most viable enabler of the smart grid. PLC exploits the power line infrastructure for data transmission and provides an economical communication backbone to support the ...
Advanced adaptive compensation system for free-space optical communications
Massive amounts of information are created daily in commercial fields like earth observation, that must be downloaded to earth ground stations in the short time of a satellite pass. Today, much of the collected information ...
Zero-thickness interface elements in petroleum geomechanics : sand production and hydraulic fracture
This thesis describes the extension of the Finite Element Method with zero-thickness interface elements (FEM+z) to 3D, large and complex problems in geomaterials, with special interest in petroleum geomechanics. This general ...
Active gate switching control of IGBT to improve efficiency in high power density converters
Insulated gate bipolar transistor (IGBT) power semiconductors are widely employed in industrial applications. This power switch capability in high voltage blocking and high current-carrying has expanded its use in power ...
Solving robotic kinematic problems : singularities and inverse kinematics
Kinematics is a branch of classical mechanics that describes the motion of points, bodies, and systems of bodies without considering the forces that cause such motion. For serial robot manipulators, kinematics consists of ...
Noves estratègies per la millora de les característiques biològiques dels implants dentals
Titanium (Ti) and its alloys are currently the materials chosen for many dental applications, mainly due to their optimum biocompatibility and excellent mechanical properties. Despite the success rates of dental implants, ...
El territorio ampurdanés entre los siglos V al X : Dispositio et compositio ecclesiae
The ecclesiastical rural architecture before the year 1000 in the Hispanic north east, has relevant information on the territorial evolution and social changes that happen in an era full of lights and shadows. This ...
