Search results for "STIR"

Henkilöhahmon sisäinen konflikti Väinö Linnan romaanissa Tuntematon sotilas

2015

The object of this study is character´s internal conflict in the novel. The primary research question is: What are the internal conflicts of characters like in Väinö Linna’s novel The Unknown Soldier? An answer to the primary research question is sought by answering the following secondary research questions: What are the specific internal conflicts like? How do they manifest? What are the most important effects they have on the structure of the narrative? What kinds of groups of characters are possible to form? How could the traditional notion of characters internal conflict, as it is traditionally defined in literary studies, be developed? In this study, internal conflict takes place when…

Detuning effects in STIRAP processes in the presence of quantum noise

2011

The Stimulated Raman adiabatic passage (STIRAP) in three-state systems in the presence of quantum noise is considered. A comparison is made between different models, one based on a phenomenological introduction of decays, one traceable back to a microscopic description of the system-environment interaction. Effects related, to off-resonance in the coupling between the involved states are considered.

An Automated Visual Inspection System for the Classification of the Phases of Ti-6Al-4V Titanium Alloy

2013

Metallography is the science of studying the physical properties of metal microstructures, by means of microscopes. While traditional approaches involve the direct observation of the acquired images by human experts, Com-puter Vision techniques may help experts in the analysis of the inspected mate-rials. In this paper we present an automated system to classify the phases of a Titanium alloy, Ti-6Al-4V. Our system has been tested to analyze the final products of a Friction Stir Welding process, to study the states of the micro-structures of the welded material.

On the choice of tool material in friction stir welding of titanium alloys

2012

La promoció artística de la reina Maria de Castella. Art i cultura a la Corona d'Aragó al segle XV

2019

La present tesi aborda la figura de la reina Maria de Castella des del seu paper com a promotora de l'art en els estats peninsulars de la Corona d'Aragó en el segle XV. L'estudi té un enfocament pluridisciplinari, basat en l'aportació i transcripció d’un gran volum de documents inèdits extrets dels arxius de la Corona d'Aragó, a Barcelona, i dels Arxius del Regne de València, Municipal de València, de la Ciutat de Xàtiva, Arxiu Històric de la Ciutat de Barcelona, Arxiu de la Catedral de Barcelona i Arxiu Comarcal de les Terres de l’Ebre, completant-se amb un estudi comparatiu de determinades obres artístiques a través dels exemples que es conserven en un bon nombre de museus estatals i estr…

Steel fibre and transverse reinforcement effects on the behaviour of high strength concrete beams

2012

An experimental program was carried out to investigate the influence of fibre reinforcement on the mechanical behaviour of high strength reinforced concrete beams. Eighteen beams, loaded in fourpoint bending tests, were examined by applying monotonically increasing controlled displacements and recording the response in terms of load-deflection curves up to failure. The major test variables were the volume fraction of steel fibres and the transverse steel amount for two different values of shear span. The contribution of the stirrups to the shear strength was derived from the deformations of their vertical legs, measured by means of strain gauges. The structural response of the tested beams …

James Stirling. Facoltà di Storia a Cambridge

2005

La Facoltà di Storia a Cambridge, costruita nel 1967 su progetto di James Stirling, è uno dei più noti ed interessanti edifici di architettura moderna. Peraltro costituisce uno dei capolavori dello scomparso architetto inglese, vincitore del Pritziker Prize e della medaglia d’oro del Royal Institute of British Architects. L’edificio, dal forte impianto geometrico, interamente in mattoni rossi e vetro, richiama l’immagine di una serra vittoriana, ma numerose sono le allusioni all’ingegneria industriale. Uno spregiudicato impianto distributivo prevede la grande sala di lettura al centro della vita di tutta la Facoltà. The University of Cambridge History Faculty Building, built in 1967 and des…

Comparative evaluation of the effect of the substrate thickness and inherent process defects on the static and fatigue performance of FSW and adhesiv…

2021

Abstract This work aims at evaluating the mechanical performance of joints in an AA6016 alloy, manufactured by means of two alternative processes: friction stir welding and adhesive bonding. Given its wide use in industrial fields such as automotive and aeronautics, an overlap configuration of joints was selected for the study, and a specific method based on the overlap length evaluation has been developed to allow comparisons among the cases. Two substrate thicknesses are considered in order to vary the overall joint stiffness, and the effect of such geometrical parameter on the mechanical behavior of the joined system is experimentally investigated. The experimental findings highlight tha…

In-process tool rotational speed variation with constant heat input in friction stir welding of AZ31 sheets with variable thickness

2017

In the present work, friction stir welding experiments on AZ31 magnesium alloy sheets, characterized by a variable thickness along the welding line, were carried out. The approach adapted during welding consisted in maintaining constant the heat input to the joint. To this purpose, the rotational speed of the pin tool was increased with decreasing thickness and decreased with increasing thickness in order to obtain the same temperatures during welding. The amount by which the rotational speed was changed as a function of the sheet thickness was defined on the basis of the results given by FEM simulations of the FSW process. Finally, the effect of the in-process variation of the tool rotatio…

On tool stirring action in friction stir welding of work hardenable aluminium alloys

2013

In the paper solid state bonding conditions obtained in friction stir welding (FSW) of AA5754-H111 butt joints are analysed, considering the so called zigzag line in the transverse section of the joints. A wide experimental campaign was carried out varying both tool advancing speed and tool rotational one. The effects of the process on the mechanical properties of the joint were highlighted and micro- and macro-observations were used in order to explain the reasons of the enhanced mechanical properties found for the welded material. Numerical results derived from a FEM model previously developed by the authors were utilised to point out the different mechanical and metallurgical behavior of…