106,190 research outputs found

    Charm semileptonic decays at the B factories

    Full text link
    A review of charm semileptonic decays results obtained at B factories is presented. It focuses on form factors measurements in D0→K−ℓ+νD^0\to K^- \ell^+ \nu, D0→π−ℓ+νD^0\to \pi^- \ell^+ \nu, Ds+→K+K−e+νeD_s^+ \to K^+K^- e^+\nu_e, and D+→K−π+e+νeD^+ \to K^-\pi^+ e^+\nu_e. For the last two decay channels, the contribution and characteristics of other components in the final state, in addition to the main vector contribution, is also studied

    Academic libraries and learning support in the electronic environment

    Get PDF
    Learning and teaching techniques are changing in the new electronic environment. Students are asked to gather information from different sources, most of them in electronic formats. Libraries have to adapt their buildings and services to meet their users needs continuously. Amongst the means librarians have included to support learning are electronic based information and learning resources, a better provision of IT technologies, working environments for different types of learning, digital reference services, information literacy skills and the possibility of accessing all these facilities, resources and services at any time. The conclusion indicates that librarians should continuously improve electronic information and learning resources, as well as discovering new ways to approach students

    Structures in Crisis: A Narrative Approach to Asghar Farhadi’s Films

    Get PDF
    This paper proposes an exploration of the films of Iranian director Asghar Farhadi. It employs a methodology based on textual analysis, focusing specifically on the structural design of his films and the focalization processes of his scripts. It shows how Farhadi’s work can be understood as a coherent research project with a uniquely solid model based on chronological linearity as a way to explore the violent breakdown of different emotional communities: families, marriages, groups of friends, etc. At the same time, it considers how all the focalization processes in his films are oriented toward two main concepts: knowledge (of the characters, but also of the audience) and pain (of living in a [narrative] world afflicted by meaninglessness)

    Compact low-power calibration mini-DACs for neural arrays with programmable weights

    Get PDF
    This paper considers the viability of compact low-resolution low-power mini digital-to-analog converters (mini-DACs) for use in large arrays of neural type cells, where programmable weights are required. Transistors are biased in weak inversion in order to yield small currents and low power consumptions, a necessity when building large size arrays. One important drawback of weak inversion operation is poor matching between transistors. The resulting effective precision of a fabricated array of 50 DACs turned out to be 47% (1.1 bits), due to transistor mismatch. However, it is possible to combine them two by two in order to build calibrated DACs, thus compensating for inter-DAC mismatch. It is shown experimentally that the precision can be improved easily by a factor of 10 (4.8% or 4.4 bits), which makes these DACs viable for low-resolution applications such as massive arrays of neural processing circuits. A design methodology is provided, and illustrated through examples, to obtain calibrated mini-DACs of a given target precision. As an example application, we show simulation results of using this technique to calibrate an array of digitally controlled integrate-and-fire neurons.Gobierno de EspaĂąa TIC1999-0446-C02-02, TIC2000-0406-P4-05, FIT-07000/2002/921, TIC2002-10878-EEuropean Union IST- 2001-3412
    • …
    corecore