How the Dynamics of a Supramolecular Polymer Determines Its Dynamic Adaptivity and Stimuli-Responsiveness: Structure-Dynamics-Property Relationships from Coarse-Grained Simulations

reserved3siThe 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 angstrom 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 dustering 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.mixedTorchi A.; Bochicchio D.; Pavan G.M.Torchi, A.; Bochicchio, D.; Pavan, G. M

Interfering signal detection device for a global navigation satellite system

An 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

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