21 research outputs found

    Il “popolare” e la marginalità del critico. Appunti e materiali dagli anni Cinquanta al trash.

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    La commedia borghese della rivoluzione sessuale

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    Detection chain and electronic readout of the QUBIC instrument

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    The Q and U Bolometric Interferometer for Cosmology (QUBIC) Technical Demonstrator (TD) aiming to shows the feasibility of the combination of interferometry and bolometric detection. The electronic readout system is based on an array of 128 NbSi Transition Edge Sensors cooled at 350mK readout with 128 SQUIDs at 1K controlled and amplified by an Application Specific Integrated Circuit at 40K. This readout design allows a 128:1 Time Domain Multiplexing. We report the design and the performance of the detection chain in this paper. The technological demonstrator unwent a campaign of test in the lab. Evaluation of the QUBIC bolometers and readout electronics includes the measurement of I-V curves, time constant and the Noise Equivalent Power. Currently the mean Noise Equivalent Power is ~ 2 x 10⁻¹⁶ W/√Hz

    Detection chain and electronic readout of the QUBIC instrument

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    The Q and U Bolometric Interferometer for Cosmology (QUBIC) Technical Demonstrator (TD) aiming to shows the feasibility of the combination of interferometry and bolometric detection. The electronic readout system is based on an array of 128 NbSi Transition Edge Sensors cooled at 350mK readout with 128 SQUIDs at 1K controlled and amplified by an Application Specific Integrated Circuit at 40K. This readout design allows a 128:1 Time Domain Multiplexing. We report the design and the performance of the detection chain in this paper. The technological demonstrator unwent a campaign of test in the lab. Evaluation of the QUBIC bolometers and readout electronics includes the measurement of I-V curves, time constant and the Noise Equivalent Power. Currently the mean Noise Equivalent Power is ~ 2 x 10⁻¹⁶ W/√Hz

    Dal neorealismo al realismo

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    Il lungo respiro di Brunello Rondi

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    Il “lungo respiro” è la metafora usata da Fellini per descrivere la straordinaria versatilità di Brunello Rondi (1924-1989), un autore che si è cimentato nei più diversi campi artistici e intellettuali: la poesia, la filosofia, la musicologia, il teatro e in particolare il cinema, vissuto in veste di sceneggiatore, regista, teorico e critico. Questo libro intende ripercorrere tutti gli itinerari, anche i più segreti, delle molteplici passioni di Rondi, che spesso si intrecciano e si motivano a vicenda. Il tentativo è quello di comporre un ritratto inedito e, per i più, sconosciuto di una personalità che ha attraversato la storia della cultura italiana del secondo Novecento con uno sguardo inquieto e vertiginoso, aperto ai più vivaci stimoli delle sperimentazioni artistiche europee e internazionali: dai saggi pioneristici su Bartók alle collaborazioni cinematografiche con Fellini, Rossellini e Pasolini. Saggi di Roberto Curti, Pierpaolo De Sanctis, Alessio Di Rocco, Enrico Duranti, Sergio Grmek Germani, Tullio Masoni, Emiliano Morreale, Stefania Parigi, Paola Pedrazzini, Alberto Pezzotta, Davide Pulici. Testimonianze di Giorgio Albertazzi, Barbara Bouchet, Lino Capolicchio, Roberto Leoni, Luciano Martino, Adriano Ossicini, Marina Pierro, Umberto Rondi.

    Optimal search processes in physics and biology

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    In this thesis, navigation and search strategies are investigated from an optimal control and statistical physics perspective. In Ch.1, a multi-agent decision making problem, a cooperative search game, is treated in the framework of optimal control. It is shown that, surprisingly, phenomenological equations that describe chemotaxis \u2013including perfect adaptation and fold-change response\u2013 emerge as the optimal solution, in a mean-field approximation, to this cooperative task. To our knowledge, such an equivalence was never noticed before, and it provides an interesting functional interpretation of chemotaxis. The content of this Chapter is available in Pezzotta et al. Phys.Rev.E 98, 042401 (2018). In Ch.2, the dynamics of a statistical mechanical model (the Conformational Spread model) \u2013that accurately reproduces the dynamics of the flagellar motor switch in Escherichia coli (E.coli)\u2013 is studied analytically by means of multi-scale techniques (decimation and averaging), providing a cooperative binding model which effectively describe the locked-state time distribution \u2013ultimately determining the run-and-tumble behaviour of E.coli. Studies of the dynamics of this model were previously limited to numerical simulations, and analytical results were achieved only at equilibrium. This work has been published as a research article in Pezzotta, et al. J.Stat.Mech. 023402 (2017). In Ch.3, we formulate a collective navigation task as an optimal control problem, in which agents have an incentive to align their velocities. A multi-scale analysis (averaging and homogenization) is used for studying the optimally controlled dynamics in the over- damped limit. The analytical solution of the effective equations at the steady state is given in particular instances of the problem (two agents on a torus). In Ch.4, it is shown that the conditioning of Markov processes to lie within a confined region of space can be regarded as an optimal search problem. As a case study, we analysed a jump process conditioned to stay within an infinitely long cylindrical domain, and to go from one end to the other. This example is inspired by the problem of sampling configurations of polymers confined in nanochannels. This work has been published in Adorisio, et al. J.Stat.Phys 170, 79-100 (2017), where more details can be found pertaining to the physics of polymers
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