Tunable diffusion of magnetic particles in a quasi-one-dimensional channel

The diffusion of a system of ferromagnetic dipoles confined in a quasi-one-dimensional parabolic trap is studied using Brownian dynamics simulations. We show that the dynamics of the system is tunable by an in-plane external homogeneous magnetic field. For a strong applied magnetic field, we find that the mobility of the system, the exponent of diffusion and the crossover time among different diffusion regimes can be tuned by the orientation of the magnetic field. For weak magnetic fields, the exponent of diffusion in the subdiffusive regime is independent of the orientation of the external field.Comment: 9 pages, 13 figures, to appear in Phys. Rev. E (2013

Hysteresis and re-entrant melting of a self-organized system of classical particles confined in a parabolic trap

A self-organized system composed of classical particles confined in a two-dimensional parabolic trap and interacting through a potential with a short-range attractive part and long-range repulsive part is studied as function of temperature. The influence of the competition between the short-range attractive part of the inter-particle potential and its long-range repulsive part on the melting temperature is studied. Different behaviors of the melting temperature are found depending on the screening length ($\kappa$) and the strength ($B$) of the attractive part of the inter-particle potential. A re-entrant behavior and a thermal induced phase transition is observed in a small region of ($\kappa,B$)-space. A structural hysteresis effect is observed as a function of temperature and physically understood as due to the presence of a potential barrier between different configurations of the system.Comment: 8 pages, 6 figure

Ohjelmistotyön tehostaminen automaatioympäristössä. Case: Jenkins

Tämän opinnäytetyön tarkoituksena oli toteuttaa Codecontrol Oy:lle avoimeen lähdekoodiin perustuvan web-pohjaisen Jenkins-palvelinsovelluksen asentaminen toimintakuntoon fyysiselle palvelimelle ja jakaa se usealle virtuaalipalvelimelle nykyisen yhden sijasta saaden kokonaisuus hyödyntämään master-slave -arkkitehtuurin mukaista ohjelmistoautomatisointimallia. Ennen varsinaista toteutusosuutta tämän opinnäytetyön teoriaosuudessa kerrotaan jatkuvasta integraatiosta ja jatkuvasta kehityksestä sekä niiden merkityksestä ohjelmistokehitykselle. Teoriaosuuden lopuksi esitellään toteutuksessa asennettava web-pohjainen palvelinsovellus Jenkins.The purpose of this thesis was to implement an open source web-based Jenkins server application installation into physical server for Codecontrol Oy and distribute it to multiple virtual servers instead of the existing one, thus enabling the whole utilization of the master-slave -architecture-based software automation model. Before the actual implementation part, the theoretical part of this thesis tells about continuous integration and continuous development and their significance for software development. Web-based server application Jenkins is introduced at the end of the theoretical part

Tornare al lavoro sul campo/Back to Fieldwork

Il testo riflette sul possibile rapporto tra indagine fotografica e indagine territoriale, alla luce di alcune importanti esperienze svolte negli ultimi decenni ed entro la prospettiva delle più recenti trasformazioni del territori italiano (e dell'Emilia-Romagna in particolare