1,336 research outputs found

    A geometry for optimizing nanoscale magnetic resonance force microscopy

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    We implement magnetic resonance force microscopy (MRFM) in an experimental geometry, where the long axis of the cantilever is normal to both the external magnetic field and the RF microwire source. Measurements are made of the statistical polarization of 1^1H in polystyrene with negligible magnetic dissipation, gradients greater than 10510^5 T/m within 100 nm of the magnetic tip, and rotating RF magnetic fields over 12 mT at 115 MHz. This geometry could facilitate the application of nanometer-scale MRFM to nuclear species with low gyro-magnetic ratios and samples with broadened resonances, such as In spins in quantum dots.Comment: 4 pages, 5 figure

    On some models of customer loyalty

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    EnBusiness databases are sources of information that a company can use together with analyses of business statistics for acquiring knowledge of its own customers. Such large availability of information allows companies to devise new models of market segmentation, customer satisfaction and customer loyalty, which require great amount of data. We investigate the possibility of defining new types of customer loyalty by using strategies of market segmentation and statistical indexes of customer satisfaction

    A Classification of the flag-transitive 22-(v,k,2)(v,k,2) designs

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    In this paper, we provide a complete classification of 22-(v,k,2)(v,k,2) design admitting a flag-transitive automorphism group of affine type with the only exception of the semilinear 11-dimensional group. Alongside this analysis we provide a construction of seven new families of such flag-transitive 22-designs, two of them infinite, and some of them involve remarkable objects such as tt-spreads, translation planes, quadrics and Segre varieties. Our result together with those Alavi et al. [1,2], Praeger et al. [15], Zhou and the first author [37,38] provides a complete classification of 22-(v,k,2)(v,k,2) design admitting a flag-transitive automorphism group with the only exception of the semilinear 11-dimensional case

    Psicoterapia e società di massa

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    Nel quadro di una teorizzazione, derivante da più ambiti, indebolente, non fondazionalistica, dell'approccio alla realtà fenomenica, la nostra attenzione si è soffermata sull'ambito psicologico, nel quale contestiamo una visione statica, atemporale e oggettivistica dell'identità soggettuale, e sosteniamo, tra l'altro, l'imprescindibilità, per la psicoterapia, del rimando alla sintomatologia dei significati esperiti dall'individuo

    Relazione affettive e società di massa

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    Ci chiediamo come l'affettività nella società di massa possa venire considerata, come sia vissuta e con quali possibili valenze e prospettive, da un soggetto che ha visto attenuarsi la sua credenza irriflessivamente adesiva in un esistente fondato e fondante e, conseguentemente, ridimensionata la monoliticità della propria identità soggettuale

    On flag-transitive 2-(k^2, k, λ) designs with λ | k

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    It is shown that, apart from the smallest Ree group, a flag-transitive automorphism group G of a 2-(k^2, k, λ) design D, with λ | k, is either an affine group or an almost simple classical group. Moreover, when G is the smallest Ree group, D is isomorphic either to the 2-(6^2, 6, 2) design or to one of the three 2- (6^2, 6, 6) designs constructed in this paper. All the four 2-designs have the 36 secants of a non-degenerate conic C of PG(2,8) as a point set and 6-sets of secants in a remarkable configuration as a block set
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