7,128 research outputs found

    On the Coexistence Magnetism/Superconductivity in the Heavy-Fermion Superconductor CePt3_3Si

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    The interplay between magnetism and superconductivity in the newly discovered heavy-fermion superconductor CePt3_3Si has been investigated using the zero-field μ\muSR technique. The μ\muSR data indicate that the whole muon ensemble senses spontaneous internal fields in the magnetic phase, demonstrating that magnetism occurs in the whole sample volume. This points to a microscopic coexistence between magnetism and heavy-fermion superconductivity.Comment: Final version, new figure structure, references correcte

    Magnetic field induced non-Fermi liquid to Fermi liquid crossover at the quantum critical point of YbCu5x_{5-x}Aux_{x}

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    The temperature (T) dependence of the muon and 63^{63}Cu nuclear spin-lattice relaxation rates 1/T11/T_1 in YbCu4.4Au0.6 is reported over nearly four decades. It is shown that for T0T\to 0 1/T11/T_1 diverges following the behaviour predicted by the self-consistent renormalization (SCR) theory developed by Moriya for a ferromagnetic quantum critical point. On the other hand, the static uniform susceptibility χs\chi_s is observed to diverge as T2/3T^{-2/3} and 1/T1Tχs21/T_1T\propto \chi_s^2, a behaviour which is not accounted for by SCR theory. The application of a magnetic field HH is observed to induce a crossover to a Fermi liquid behaviour and for T0T\to 0 1/T11/T_1 is found to obey the scaling law 1/T1(H)=1/T1(0)[1+(μBH/kBT)2]11/T_1(H)= 1/T_1(0)[1+(\mu_BH/k_BT)^2]^{-1}.Comment: 4 pages, 4 figure

    Asymmetry in Leader Image Effects and the Implications for Leadership Positioning in the 2010 British General Election

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    Using national survey data on voters' perceptions of party leaders during the 2010 British general election campaign, we use logistic regression analysis to explore the association between specific image attributes and overall satisfaction for each leader. We find attribute-satisfaction relationships differ in some respects between the three main party leaders, demonstrating that leader image effects are not symmetrical across leaders. We find evidence that negative perceptions have more powerful effects on satisfaction than positive ones, implying that parties should seek to determine a leader's image attribute perceptions measured against the public's expectations of them on the same dimensions. The positions that campaigners ought then to choose are those that will have the most beneficial effect in encouraging voting behaviour for each particular leader or discouraging voting behaviour for an opponent

    'White knuckle care work' : violence, gender and new public management in the voluntary sector

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    Drawing on comparative data from Canada and Scotland, this article explores reasons why violence is tolerated in non-profit care settings. This article will provide insights into how workers' orientations to work, the desire to care and the intrinsic rewards from working in a non-profit context interact with the organization of work and managerially constructed workplace norms and cultures (Burawoy, 1979) to offset the tensions in an environment characterized by scarce resources and poor working conditions. This article will also outline how the same environment of scarce resources causes strains in management's efforts to establish such cultures. Working with highly excluded service users with problems that do not respond to easy interventions, workers find themselves working at the edge of their endurance, hanging on by their fingernails, and beginning to participate in various forms of resistance; suggesting that even among the most highly committed, 'white knuckle care' may be unsustainable

    Technological impacts on market attitudes and behaviors

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    Technology has had a profound effect on twentieth century society and is increasingly changing the nature of the way we live our lives in the twenty first century, particularly, but not solely, through innovations in digital and social media marketing. As media and other technologies change, the question arising concerns how these changes impact on consumers’ attitudes and behaviors, and consequently on their lives. In this special edition, nine papers are presented, outlining cutting-edge research exploring how changing technologies affect consumer attitudes, emotions and behaviors in a variety of country settings and industries. In this introductory editorial, the papers are outlined in further detail, with a brief exposition of their contribution

    1932 The Analysis

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    WE HAVE toiled, tried to co-operate and now we lay down our efforts. We sincerely hope that the records are accurate. The book contains the amusing and outstanding events that we as a staff carry out into life. Perhaps our vision has been blurred and missed some features, for this we apologize. The humor, we hope, will be looked upon fairly and may it be appreciated to the fullest, with malice to none. The rest lies with public opinion.https://jdc.jefferson.edu/analysis/1004/thumbnail.jp

    On the spectroastrometric separation of binary point-source fluxes

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    Spectroastrometry is a technique which has the potential to resolve flux distributions on scales of milliarcseconds. In this study, we examine the application of spectroastrometry to binary point sources which are spatially unresolved due to the observational point spread function convolution. The technique uses measurements with sub-pixel accuracy of the position centroid of high signal-to-noise long-slit spectrum observations. With the objects in the binary contributing fractionally more or less at different wavelengths (particularly across spectral lines), the variation of the position centroid with wavelength provides some information on the spatial distribution of the flux. We examine the width of the flux distribution in the spatial direction, and present its relation to the ratio of the fluxes of the two components of the binary. Measurement of three observables (total flux, position centroid and flux distribution width) at each wavelength allows a unique separation of the total flux into its component parts even though the angular separation of the binary is smaller than the observations' point-spread function. This is because we have three relevant observables for three unknowns (the two fluxes, and the angular separation of the binary), which therefore generates a closed problem. This is a wholly different technique than conventional deconvolution methods, which produce information on angular sizes of the sampling scale. Spectroastrometry can produce information on smaller scales than conventional deconvolution, and is successful in separating fluxes in a binary object with a separation of less than one pixel. We present an analysis of the errors involved in making binary object spectroastrometric measurements and the separation method, and highlight necessary observing methodology.Comment: 11 pages, 8 figures, accepted for publication in Astronomy and Astrophysic

    Sub-milliarcsecond precision spectro-astrometry of Be stars

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    The origin of the disks around Be stars is still not known. Further progress requires a proper parametrization of their structure, both spatially and kinematically. This is challenging as the disks are very small. Here we assess whether a novel method is capable of providing these data. We obtained spectro astrometry around the Pa beta line of two bright Be stars, alpha Col and zeta Tau, to search for disk signatures. The data, with a pixel to pixel precision of the centroid position of 0.3..0.4 milliarcsecond is the most accurate such data to date. Artefacts at the 0.85 mas level are present in the data, but these are readily identified as they were non-repeatable in our redundant datasets. This does illustrate the need of taking multiple data to avoid spurious detections. The data are compared with simple model simulations of the spectro astrometric signatures due to rotating disks around Be stars. The upper limits we find for the disk radii correspond to disk sizes of a few dozen stellar radii if they rotate Keplerian. This is very close to observationally measured and theoretically expected disk sizes, and this paper therefore demonstrates that spectro-astrometry, of which we present the first such attempt, has the potential to resolve the disks around Be stars.Comment: 6 pages, A&A accepte
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