Patterning molecular scale paramagnets at Au Surface: A root to Magneto-Molecular-Electronics

Few examples of the exploitation of molecular magnetic properties in molecular electronics are known to date. Here we propose the realization of Self assembled monolayers (SAM) of a particular stable organic radical. This radical is meant to be used as a standard molecule on which to prove the validity of a single spin reading procedure known as ESR-STM. We also discuss a range of possible applications, further than ESR-STM, of magnetic monolayers of simple purely organic magnetic molecule.Comment: This preprint is currently partially under revisio

Exponential mapping for non semisimple quantum groups

The concept of universal T matrix, recently introduced by Fronsdal and Galindo in the framework of quantum groups, is here discussed as a generalization of the exponential mapping. New examples related to inhomogeneous quantum groups of physical interest are developed, the duality calculations are explicitly presented and it is found that in some cases the universal T matrix, like for Lie groups, is expressed in terms of usual exponential series.Comment: 12 page

Dissipative bracing-based seismic retrofit hypothesis of an elevated water storage tank with R/C frame staging structure

A seismic performance assessment and supplemental damping-based retrofit study on a heritage reinforced concrete (R/C) elevated water storage tank is presented. The structure was built in the early 1930s as water supplier for the coal power plant of Santa Maria Novella Station in Florence, and is still in service. The tank has a R/C frame supporting structure and is currently used as water supplier for trains and platform services. The dynamic behavior of the fluid is simulated by a classical convective plus impulsive mass model, for which a discrete three-dimensional schematization is originally implemented in the finite element analysis. The time-history assessment enquiry highlights a remarkable plastic response of the frame structure under seismic action scaled at the maximum considered earthquake level. Based on these results, a retrofit hypothesis is proposed, consisting in the installation in the staging structure of a dissipative bracing (DB) system incorporating pressurized fluid viscous spring-dampers. The DB technology, studied by the first two authors during the last two decades by focusing on the numerical and analytical modeling, the experimental characterization and verification, the definition of design procedures, and the development of several applications to R/C and steel frame building structures, is explored for the first time within the study reported here for the seismic retrofit of elevated tanks. The mechanical parameters, design criteria and technical implementation details of the rehabilitation strategy are illustrated. The verification time-history analyses in protected conditions show that a substantial enhancement of the seismic response capacities of the structure is attained as compared to its original configuration, with little architectural intrusion, quick installation works and low costs

Does the innovation-orientation lead to retail industry growth? Empirical evidence from patent analysis

Competitiveness and complexity in the retail industry are increasing due to rapid technological changes and diffusion. Patent analysis is largely used in innovation studies to assess and monitor technological changes in different sectors. The aim of this paper is to provide a comprehensive view of the innovative forces affecting the retailing sector, by focusing on the evaluation of innovation levels through the classification and analysis of patented innovations. The findings show that retailers might shift to more innovation-oriented strategies in order to propose innovative consumer solutions, due to the support of the technology advancements highlighted by the strong patent track record. Our study contributes to the literature by providing empirical evidence of critical areas for innovation in retailing and by offering bibliometric and patent analytical methods measures relative to the innovative forces affecting retailing, which might push the sector to be increasingly an innovation-oriented one. Finally, the high level of property rights (defined by the huge amount of patents) pushes retailers to invest more on acquiring patented technologies to achieve advantages over competitors or to adopt novel management practices as substitutes for patents

Magnetic properties and spin dynamics in single molecule paramagnets Cu6Fe and Cu6Co

The magnetic properties and the spin dynamics of two molecular magnets have been investigated by magnetization and d.c. susceptibility measurements, Electron Paramagnetic Resonance (EPR) and proton Nuclear Magnetic Resonance (NMR) over a wide range of temperature (1.6-300K) at applied magnetic fields, H=0.5 and 1.5 Tesla. The two molecular magnets consist of CuII(saldmen)(H2O)}6{FeIII(CN)6}](ClO4)38H2O in short Cu6Fe and the analog compound with cobalt, Cu6Co. It is found that in Cu6Fe whose magnetic core is constituted by six Cu2+ ions and one Fe3+ ion all with s=1/2, a weak ferromagnetic interaction between Cu2+ moments through the central Fe3+ ion with J = 0.14 K is present, while in Cu6Co the Co3+ ion is diamagnetic and the weak interaction is antiferromagnetic with J = -1.12 K. The NMR spectra show the presence of non equivalent groups of protons with a measurable contact hyperfine interaction consistent with a small admixture of s-wave function with the d-function of the magnetic ion. The NMR relaxation results are explained in terms of a single ion (Cu2+, Fe3+, Co3+) uncorrelated spin dynamics with an almost temperature independent correlation time due to the weak magnetic exchange interaction. We conclude that the two molecular magnets studied here behave as single molecule paramagnets with a very weak intramolecular interaction, almost of the order of the dipolar intermolecular interaction. Thus they represent a new class of molecular magnets which differ from the single molecule magnets investigated up to now, where the intramolecular interaction is much larger than the intermolecular one

Coherent coupling between Vanadyl Phthalocyanine spin ensemble and microwave photons: Towards integration of molecular spin qubits into quantum circuits

Electron spins are ideal two-level systems that may couple with microwave photons so that, under specific conditions, coherent spin-photon states can be realized. This represents a fundamental step for the transfer and the manipulation of quantum information. Along with spin impurities in solids, molecular spins in concentrated phases have recently shown coherent dynamics under microwave stimuli. Here we show that it is possible to obtain high cooperativity regime between a molecular Vanadyl Phthalocyanine (VOPc) spin ensemble and a high quality factor superconducting YBa2Cu3O7 (YBCO) coplanar resonator at 0.5 K. This demonstrates that molecular spin centers can be successfully integrated in hybrid quantum devices

Storage and retrieval of microwave pulses with molecular spin ensembles

Abstract Hybrid architectures combining complementary quantum systems will be largely used in quantum technologies and the integration of different components is one of the key issues. Thanks to their long coherence times and the easy manipulation with microwave pulses, electron spins hold a potential for the realization of quantum memories. Here, we test diluted oxovanadium tetraphenyl porphyrin (VO(TPP)) as a prototypical molecular spin system for the Storage/Retrieval of microwave pulses when embedded into planar superconducting microwave resonators. We first investigate the efficiency of several pulse sequences in addressing the spins. The Carr-Purcell and the Uhrig Dynamical Decoupling enhance the memory time up to three times with three π pulses. We then successfully store and retrieve trains of up to 5 small pulses by using a single recovery pulse. These results demonstrate the memory capabilities of molecular spin ensembles when embedded into quantum circuits

Anaphora Resolution in Near-Native Speakers of Italian

This study presents data from an experiment on the interpretation of intrasentential anaphora in Italian by native Italian speakers and by English speakers who have learned Italian as adults and have reached a near-native level of proficiency in this language. The two groups of speakers were presented with complex sentences consist-ing of a main clause and a subordinate clause, in which the subor-dinate clause had either an overt pronoun or a null subject pronoun. In half of the sentences the main clause preceded the subordinate clause (forward anaphora) and in the other half the subordinate clause preceded the main clause (backward anaphora). Participants performed in a picture verification task in which they had to indi-cate the picture(s) that corresponded to the meaning of the subor-dinate clause, thus identifying the possible antecedents of the null or overt subject pronouns. The patterns of responses of the two groups were very similar with respect to the null subject pronouns in both the forward and backward anaphora conditions. Compared to native monolingual speakers, however, the near-natives had a significantly higher preference for the subject of the matrix clause as a possible antecedent of overt subject pronouns, particularly in the backward anaphora condition. The results indicate that near-native speakers have acquired the syntactic constraints on pronom-inal subjects in Italian, but may have residual indeterminacy in the interface processing strategies they employ in interpreting pronom-inal forms

Dielectric Effects in FeO x-Coated Au Nanoparticles Boost the Magnetoplasmonic Response: Implications for Active Plasmonic Devices

Plasmon resonance modulation with an external magnetic field (magnetoplasmonics) represents a promising route for the improvement of the sensitivity of plasmon-based refractometric sensing. To this purpose, an accurate material choice is needed to realize hybrid nanostructures with an improved magnetoplasmonic response. In this work, we prepared core@shell nanostructures made of an 8 nm Au core surrounded by an ultrathin iron oxide shell (≤1 nm). The presence of the iron oxide shell was found to significantly enhance the magneto-optical response of the noble metal in the localized surface plasmon region, compared with uncoated Au nanoparticles. With the support of an analytical model, we ascribed the origin of the enhancement to the shell-induced increase in the dielectric permittivity around the Au core. The experiment points out the importance of the spectral position of the plasmonic resonance in determining the magnitude of the magnetoplasmonic response. Moreover, the analytical model proposed here represents a powerful predictive tool for the quantification of the magnetoplasmonic effect based on resonance position engineering, which has significant implications for the design of active magnetoplasmonic devices