Search results for "STIR"
showing 10 items of 426 documents
Residual stress and material flow prediction in Friction Stir Welding of Gr2 Titanium T-joints
2022
Friction Stir Welding is nowadays an established technique successfully used by many industries. However, most of the research and, consequently, most of the applications regard aluminum alloys and butt joints. T-joints are of high interest for different industrial sectors as aeronautical, aerospace, naval and ground transportation, for which joint integrity and low residual stress are extremely important. In this study, an experimental and numerical approach is proposed with the aim to study the peculiarities of the residual stress distribution and material flow occurring in FSW of CP-Ti T-joints. Experiments were carried out to assess the feasibility of the process and to acquire the temp…
Racial discourse in James Baldwin's Blues for Mister Charlie (1964) : drama and the hegemonic struggle
2012
Gozos en loor del santisimo Lignum Crucis, que se venera en el Real Monasterio de San Miguel de los Reyes, extra muros de Valencia.
El full orlat Grav. xil. enmarcat de "El Lignum Crucis q. se venera en el Rl. Monastº. de S. Miguel de los Reyes", de diferent color que la resta del full i flanquejat per gerros amb flors Text del goig a tres col. separades per filets
Defensa legal por la Administración de Vicenta Espous, y de Llinares, contra el Real Convento de Nuestra Señora del Puig, sobre que se confirme la Se…
1747
Signat al final: "Dr. Joseph Boyl" Caplletra ornada al començament del text i [cristus] sobre el tít Sign.: A-D2 Reclams
Oxidation of pentan-2-ol -Part II: Experimental and modeling study
2021
International audience; The oxidation of pentan-2-ol was investigated at high-pressure in a jet-stirred reactor and in a shock tube. Experiments in the JSR were carried out at 10 atm, between 500-1180 K, for five different equivalence ratios of = 0.35, 0.5, 1, 2, 4 and 1000 ppm of fuel, at a constant residence time of 0.7 s. Reactant, product and intermediate species mole fractions were quantified using Fourier transform infrared spectrometry (FTIR) and gas chromatography (GC). Ignition delay times were measured for pentan-2-ol/O 2 mixtures in argon in a shock tube at 20 and 40 bar, in a temperature range of 1070-1460 K and for equivalence ratios of = 0.5, 1 and 2. Ignition delay times of a…
Numerical and experimental study of liquid metal stirring by rotating permanent magnets
2018
In this work, we study liquid gallium stirring by rotating permanent magnets. We demonstrate possibility of easily creating different flow patterns by rotating permanent magnets, which can be industrially important for controlling heat and mass transfer processes in the system. Unlike the typical approach of simulating magnet rotation as a transient problem and time-averaging the Lorentz forces, we solve the magnet rotation as a harmonic (frequency domain) problem, which leads to forces equal to time-averaged ones and decreases the simulation time considerably. Numerical results are validated using qualitative flow structure results from the neutron radiography visualization of tracer parti…
Friction Stir Welding of Tailored Blanks: Investigation on Process Feasibility
2006
Tailor welded blanks (TWBs) are conventionally produced by laser or traditional welding processes. In either case, the joints are created by solid-liquid-solid phase transformations that result in undesirable microstructures and tensile residual stresses detrimental to joint performance. This study investigates feasibility of an alternate joining process, friction stir welding (FSW). The joining of AA7075-T6 blanks of different thickness is investigated through FE analyses and controlled experiments. It is found that for a successful joint, the welding parameters have to be carefully designed so that the resulting metal flow and the temperature history during FSW are consistent for the two …
Roadmap on STIRAP applications
2019
STIRAP (stimulated Raman adiabatic passage) is a powerful laser-based method, usually involving two photons, for efficient and selective transfer of populations between quantum states. A particularly interesting feature is the fact that the coupling between the initial and the final quantum states is via an intermediate state, even though the lifetime of the latter can be much shorter than the interaction time with the laser radiation. Nevertheless, spontaneous emission from the intermediate state is prevented by quantum interference. Maintaining the coherence between the initial and final state throughout the transfer process is crucial. STIRAP was initially developed with applications in …
Riconfigurare i territori metroplitani. Forme di urbanizzazione e fenomeni di pressione insediativa sui sistemi di interesse naturale in Sicilia
2018
The consumption of the soil due to urbanization it is a phenomena already for many years under observations, but of which only the scientific environment has noticed the elevated environmental impact progress. From a disciplinary point of view, is possible to identify a line of research focusing on the analysis and identification of new morphologies of urbanization and on the interaction among different settlement patterns coexisting in a specific context. This reading complements with the scientific production about the forms of settlement pressure on environmental systems, producing change and deterioration on natural ecosystems and loss of biodiversity. A necessary reference for this lin…
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…