PIXEL 2010 - a Resume

The Pixel 2010 conference focused on semiconductor pixel detectors for particle tracking/vertexing as well as for imaging, in particular for synchrotron light sources and XFELs. The big LHC hybrid pixel detectors have impressively started showing their capabilities. X-ray imaging detectors, also using the hybrid pixel technology, have greatly advanced the experimental possibilities for diiffraction experiments. Monolithic or semi-monolithic devices like CMOS active pixels and DEPFET pixels have now reached a state such that complete vertex detectors for RHIC and superKEKB are being built with these technologies. Finally, new advances towards fully monolithic active pixel detectors, featuring full CMOS electronics merged with efficient signal charge collection, exploiting standard CMOS technologies, SOI and/or 3D integration, show the path for the future. This r\'esum\'e attempts to extract the main statements of the results and developments presented at this conference.Comment: 8 pages, 19 figures, conference summar

Three-dimensional evolution of magnetic and velocity shear driven instabilities in a compressible magnetized jet

The problem of three-dimensional combined magnetic and velocity shear driven instabilities of a compressible magnetized jet modeled with a plane neutral/current double vortex sheet in the framework of the resistive magnetohydrodynamics is addressed. The resulting dynamics given by the stream+current sheet interaction is analyzed and the effects of a variable geometry of the basic fields are considered. Depending on the basic asymptotic magnetic field configuration, a selection rule of the linear instability modes can be obtained. Hence, the system follows a two-stage path developing either through a fully three-dimensional dynamics with a rapid evolution of kink modes leading to a final turbulent state, or rather through a driving two-dimensional instability pattern that develops on parallel planes on which a reconnection+coalescence process takes place.Comment: 33 pages, 15 figures, accepted for publication in Physics of Plasma

I contratti di assunzione nella manifattura tessile Ragusea

Nel 1416, la città di Ragusa (Dubrovnik) approvò il primo stanziamento di fondi pubblici per la realizzazione di una manifattura tessile sul modello delle città italiane. Un progetto mirato ad incentivare l’arrivo di imprenditori ed artigiani stranieri ed a realizzare una struttura industriale capace di ospitare le diverse fasi della produzione. Il presente articolo si propone di studiare i contratti di assunzione riguardanti la produzione tessile stipulate tra il 1417 ed il 1434, anno della prima chiusura del settore nei confronti degli artigiani forestieri. Un complesso di 544 documenti, qui analizzati nei loro aspetti quantitativi e statistici, distinguendo le diverse tipologie, gli aspetti formali ed i cambiamenti avvenuti negli anni. Uno studio che vuole definire l’approccio maturato da una città medievale nei confronti di un contesto economico e sociale di nuova realizzazione, attraverso l’utilizzo di modelli innovativi e divergenti dagli usi locali

Principi di funzionamento di antenne al plasma.

Nella presente tesi vengono studiate le applicazioni di colonne al plasma come antenne a radio frequenza. Dopo un'analisi delle onde superficiali di plasma in termini di relazione di dispersione e congruenza con i modelli teorici, vengono analizzate le proprietà radiative e di rumore di tali antenne

Self-consistent Seeding of the Interchange Instability in Dipolarization Fronts

We report a 3D magnetohydrodynamics simulation that studies the formation of dipolarization fronts during magnetotail reconnection. The crucial new feature uncovered in the present 3D simulation is that the process of reconnection produces flux ropes developing within the reconnection region. These flux ropes are unstable to the kink mode and introduce a spontaneous structure in the dawn-dusk direction. The dipolarization fronts forming downstream of reconnection are strongly affected by the kinking ropes. At the fronts, a density gradient is present with opposite direction to that of the acceleration field and leads to an interchange instability. We present evidence for a causal link where the perturbations of the kinking flux ropes with their natural and well defined scales drive and select the scales for the interchange mode in the dipolarization fronts. The results of the simulation are validated against measured structures observed by the Themis mission.Comment: 4 figures, to appear on Geophys. Res. Let

PENYISIHAN AMONIUM DENGAN PROSES ANAMMOX DAN NITRIFIKASI-DENITRIFIKASI PADA TIDAL FLOW CONSTRUCTED WETLANDS

Penelitian ini bertujuan untuk menganalisis kinerja tidal flow constructed wetlands dalam penyisihan amonium melalui proses anammox dan nitrifikasi-denitrifikasi dengan tanaman Equisetum hyemale selama 70 hari. Tidal flow constructed wetlands skala laboratorium berbasis batu apung dan zeolit dioperasikan dengan siklus 10 jam tergenang dan 2 jam kering. Percobaan dilakukan menggunakan limbah artifisial dengan konsentrasi amonium 70 mg-N/L dan tiga variasi reaktor. Reaktor 1 ditambahkan spesies anammox Candidatus Brocadia fulgida, sedimen Muaro Panjalinan sebagai sumber Ammonium Oxidizing Bacteria (AOB). Reaktor 2 hanya sedimen Muaro Panjalinan sebagai sumber bakteri nitrifikasi-denitrifikasi, sedangkan Reaktor 3 sebagai kontrol tanpa penambahan inokulum bakteri. Konsentrasi amonium dianalisis menggunakan Spektrofotometer UV-Vis dengan efisiensi penyisihan dilihat dari parameter Nitrogen Removal Efficiency (NRE) dan Amonium Conversion Efficiency (ACE). Nilai NRE dan ACE pada Reaktor 1, Reaktor 2, Reaktor 3 berturut-turut 74,04% dan 98,19%, 63,48% dan 90,44%, 48,62% dan 74,42%. Reaktor tidal flow constructed wetlands dengan tanaman Equisetum hyemale menggunakan proses anammox dan nitrifikasi-denitrifikasi, memiliki efisiensi penyisihan amonium yang lebih tinggi dibandingkan dengan reaktor kontrol