1,720,967 research outputs found
La rappresentazione di genere nella ricerca internazionale
No full textIl contributo presenta una ricognizione critica: a) della ricerca internazionale sulla rappresentazione di genere nei diversi ambiti della programmazione televisiva: l'informazione, la comunicazione politica, l'intrattenimento, la fiction; b) della riflessione teorico-professionale e del dibattito pubblico sulla presenza e sul ruolo delle donne nella governance e nell'organizzazione produttiva della comunicazione televisiva in ambito europeo
How the Dynamics of a Supramolecular Polymer Determines Its Dynamic Adaptivity and Stimuli-Responsiveness: Structure-Dynamics-Property Relationships from Coarse-Grained Simulations
No full textThe rational design of supramolecular polymers that can adapt or respond in time to specific stimuli in a controlled way is interesting for many applications, but this requires understanding the molecular factors that make the material faster or slower in responding to the stimulus. To this end, it is necessary to study the dynamic adaptive properties at submolecular resolution, which is difficult at an experimental level. Here we show coarse-grained molecular dynamics simulations (<5 Å resolution) demonstrating how the dynamic adaptivity and stimuli responsiveness of a supramolecular polymer is controlled by the intrinsic dynamics of the assembly, which is in turn determined by the structure of the monomers. As a representative case, we focus on a water-soluble 1,3,5-benzenetricarboxamide (BTA) supramolecular polymer incorporating (charged) receptor monomers, experimentally seen to undergo dynamic clustering following the superselective binding to a multivalent recruiter. Our simulations show that the dynamic reorganization of the supramolecular structure proceeds via monomer diffusion on the dynamic fiber surface (exchange within the fiber). Rationally changing the structure of the monomers to make the fiber surface more or less dynamic allows tuning the rate of response to the stimulus and of supramolecular reconfiguration. Simple in silico experiments draw a structure-dynamics-property relationship revealing the key factors underpinning the dynamic adaptivity and stimuli-responsiveness of these supramolecular polymers. We come out with clear evidence that to master the bioinspired properties of these fibers, it is necessary to control their intrinsic dynamics, while the high-resolution of our molecular models permits us to show how
A New Strategy to Mitigate Side-Peak Lock Errors in Tracking Multi-Peak Code Correlation Functions
No full textThe paper presents a novel strategy capable to effectively mitigate possible false locks of the receiver tracking stage in case of multi-peak code correlation functions, as for example high-order Binary Offset Carrier (BOC) modulations, used in modern Global Navigation Satellite System signals (e.g. Galileo and modernized GPS). The proposed strategy represents an enhanced version of well-known “bump-jumping” approach and it differs from the other solutions at the state of the art.
Simulation results are provided in order to demonstrate and validate the performance and the flexibility of the proposed strategy in three cases: BOC(1,1) (Galileo E1 Open Service), BOCc(15,2.5) (Galileo E1a-like) and BOCc(10,5) (Galileo E6a-like) modulated signals
Impact of the Group Delay on BOC(M,N) Tracking: Potential Filter Issues in Robust Side-Lobe Switching for High-Order BOC Modulations
No full textThis paper discusses some technical problems and proposes a solution related to the implementation of a robust switching between single-side and double-side lobe tracking modes in case of BOC modulated signals, in particular BOC(M,N), with M, N > 1. It is demonstrated that typical group delay distortions due to wide-band front-end filters can potentially lead to code tracking biases, increasing the risk of false locks and degrading the performance of the BOC tracking loops. These effects represent also a potential problem for the coexistence of the side-lobe switching functionality with other advanced algorithms in professional-grade GNSS receivers. These practical issues are investigated and a possible solution is demonstrated by means of simulation results, considering the BOC(M,N) modulations in the Galileo E1a and E6a bandwidths
A new open-loop multipath mitigation strategy suitable to modern GNSS signals
No full textThe paper presents a new multipath mitigation strategy suitable to current Global Navigation Satellite System signals (e.g. Galileo and modernized GPS), including high order Binary Offset Carrier (BOC) modulated signals. The proposed strategy differs from the other approaches in the state of the art, based on the same number of correlators (five): while the code tracking discrimination function is realized by means of a traditional closed-loop architecture based on three correlators (Early, Prompt, and Late), the multipath mitigation is implemented in open-loop, exploiting the measurements of two additional correlators not directly used in the discriminator for the code tracking loop. Simulation results are provided in order to demonstrate and validate the performance and the flexibility of the proposed strategy in three cases: CBOC(6,1,1/11) (Galileo E1 Open Service), BPSK(1) (GPS L1 C/A) and BOCc(15,2.5) (Galileo E1a-like) modulated signals
Ricevitore elettronico con correlatori in anello aperto per la mitigazione dell'interferenza da cammini multipli e metodo di stima di un errore di allineamento
No full textDomanda di brevetto per invenzione industriale depositata il 29 luglio 2013,
Proprietario del brevetto SELEX ES S.P.A
Il sudore del torchi a Malta. La tipografia dell'Ordine gerosolimitano (1642-1798)
No full textL'Ordine di Malta si è sempre prodigato di trasmettere attraverso la stampa il proprio operato e la propria storia. Il ritrovamento di un manoscritto che descrive l'attività tipografica della stamperia collocata dal 1756 presso il palazzo magistrale ha permesso di completare la ricostruzione della storia dell'attività dei torchi a Malta che già avevano iniziato ad operare, con intervalli più o meno ampi, dal 1642
Interfering signal detection device for a global navigation satellite system
No full textAn interfering signal detection device, including: a receiver stage for an input signal (s i (t)) an oscillator (52), which generates a local signal (s l (n)) having a local frequency (f sweep ) and a plurality of correlation branches (24) to generate, at each integration period (T=L/f s ), samples of corresponding correlation signals (s d , -1 (w), s d,0 (w), s d,1 (w)), indicative of the correlation of the input signal with a plurality of local periodical signals (cr -1 (n), cr 0 (n), cr 1 (n)) time shifted with respect to each other. The device also includes: a correlator (54), which determines a value vector on the basis of samples of the correlation signals generated during a detection period (T r ) formed by at least one integration period and a detection stage (54), which computes the eigenvalues of an estimated covariance matrix, on the basis of the value vector, and detects the interfering signal by comparison with a threshold. During the detection period, the oscillator varies the local frequency independently of the input signal
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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