551 research outputs found

    Weak localization of Dirac fermions in graphene beyond the diffusion regime

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    We develop a microscopic theory of the weak localization of two-dimensional massless Dirac fermions which is valid in the whole range of classically weak magnetic fields. The theory is applied to calculate magnetoresistance caused by the weak localization in graphene and conducting surfaces of bulk topological insulators.Comment: 5 pages, 2 figure

    Managing experience co-creation practices: Direct and indirect inducement in pop-up food tourism events

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    Consumers performing the role of value-creators in experience co-creation introduces idiosyncrasies that challenge experiential consistency. Taking ‘pop-up’ dining events as its empirical focus, and drawing on semi-structured interviews with participants, this study examines how organisations and consumers interact to negotiate ambiguity, variability and consistency. The paper questions how organisers try to prescribe normative rules governing events. It considers how consumers invest in preparing for events, and engage in socialised performances to create unique experiences. The data are also used to show how peer surveillance shapes consumer expectations, behaviours and interpretations. Consequently, this study contributes to knowledge on the practical management of co-creation by conceptualising different pathways through which organisations and consumers attempt to orchestrate behaviours. Moreover, in theorising from the data, this paper distinguishes between direct and indirect modes of inducement used to achieve experiential outcomes, identifying how ‘value-signalling’ practices engage event stakeholders and shape their co-creation.

    Tourism workforce research : a review, taxonomy and agenda

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    This paper offers a critical review, purview and future view of 'workforce' research. We argue that the tourism (and hospitality) workforce research domain, beyond being neglected relative to its importance, suffers from piecemeal approaches at topic, analytical, theoretical and methods levels. We adopt a three-tiered macro, meso and micro level framework into which we map the five pervasive themes from our systematic review across a 10 year period (2005-2014). A critique of the literature, following a 'representations' narrative, culminates in the modelling of a tourism workforce taxonomy, which we propose should guide the acknowledgement and advancement of more holistic tourism workforce knowledge development

    Creating family-friendly pub experiences: A composite data study

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    Pubs have traditionally been important social and community spaces, hosting multiple consumer segments. Successful pubs have broadened their appeal, for example by expanding their food provision and targeting family segments. However, little is known about the features and practices that make pubs appealing to families. Drawing on a ‘composite’ data set, consisting of 40 qualitative interviews and 387 responses to a directed online discussion thread, this paper examines what contributes to making pubs family-friendly. Data show how parental consumption intersects with parenting work, highlighting how physical and symbolic design features, tailored services, social interactions, and socio-material practices of the food offerings can shape consumption experiences positively and negatively. The paper thus contributes to practical knowledge by identifying how pubs can create family-friendly experiences. It also contributes to theoretical knowledge by conceptualising how ‘framing’ processes or effects, shaped by personal, situational and socio-cultural ‘imperatives’, influence consumer perceptions, behaviours and experiences

    Study of flare energy release using events with numerous type III-like bursts in microwaves

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    The analysis of narrowband drifting of type III-like structures in radio bursts dynamic spectra allows to obtain unique information about primary energy release mechanisms in solar flares. The SSRT spatially resolved images and a high spectral and temporal resolution allow direct determination not only the positions of its sources but also the exciter velocities along the flare loop. Practically, such measurements are possible during some special time intervals when the SSRT (about 5.7 GHz) is observing the flare region in two high-order fringes; thus, two 1D scans are recorded simultaneously at two frequency bands. The analysis of type III-like bursts recorded during the flare 14 Apr 2002 is presented. Using-muliwavelength radio observations recorded by SSRT, SBRS, NoRP, RSTN we study an event with series of several tens of drifting microwave pulses with drift rates in the range from -7 to 13 GHz/s. The sources of the fast-drifting bursts were located near the top of the flare loop in a volume of a few Mm in size. The slow drift of the exciters along the flare loop suggests a high pitch-anisotropy of the emitting electrons.Comment: 16 pages, 6 figures, Solar Physics, in press, 201

    Net positive outcomes for nature

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    Much research and policy effort is being expended on seeking ways to conserve living nature while enabling the economic and social development needed to increase global equity and end poverty. We propose that this will only be possible if the language of policy shifts away from setting conservation targets that focus on avoiding losses and towards developing processes that consider net outcomes for biodiversity

    First measurement of nuclear recoil head-tail sense in a fiducialised WIMP dark matter detector

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    Recent computational results suggest that directional dark matter detectors have potential to probe for WIMP dark matter particles below the neutrino floor. The DRIFT-IId detector used in this work is a leading directional WIMP search time projection chamber detector. We report the first measurements of the detection of the directional nuclear recoils in a fully fiducialised low-pressure time projection chamber. In this new operational mode, the distance between each event vertex and the readout plane is determined by the measurement of minority carriers produced by adding a small amount of oxygen to the nominal CS2_{2} + CF4_{4} target gas mixture. The CS2_2 + CF4_4 + O2_2 mixture has been shown to enable background-free operation at current sensitivities. Sulfur, fluorine, and carbon recoils were generated using neutrons emitted from a 252^{252}Cf source positioned at different locations around the detector. Measurement of the relative energy loss along the recoil tracks allowed the track vector sense, or the so-called head-tail asymmetry parameter, to be deduced. Results show that the previously reported observation of head-tail sensitivity in pure CS2_{2} is well retained after the addition of oxygen to the gas mixture

    Photoproduction of D∗±D^{*\pm} mesons associated with a leading neutron

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    The photoproduction of D∗±(2010)D^{*\pm} (2010) mesons associated with a leading neutron has been observed with the ZEUS detector in epep collisions at HERA using an integrated luminosity of 80 pb−1^{-1}. The neutron carries a large fraction, {xL>0.2x_L>0.2}, of the incoming proton beam energy and is detected at very small production angles, {Ξn<0.8\theta_n<0.8 mrad}, an indication of peripheral scattering. The D∗D^* meson is centrally produced with pseudorapidity {∣η∣1.9|\eta| 1.9 GeV}, which is large compared to the average transverse momentum of the neutron of 0.22 GeV. The ratio of neutron-tagged to inclusive D∗D^* production is 8.85±0.93(stat.)−0.61+0.48(syst.)%8.85\pm 0.93({\rm stat.})^{+0.48}_{-0.61}({\rm syst.})\% in the photon-proton center-of-mass energy range {130<W<280130 <W<280 GeV}. The data suggest that the presence of a hard scale enhances the fraction of events with a leading neutron in the final state.Comment: 28 pages, 4 figures, 2 table
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