Comparison of experimental data and theoretical calculations for electrical resistivity and Hall coefficient in quasi-one-dimensional organic conductor (TMTSF)2PF6

The temperature dependences of the Hall coefficient and electrical resistivity recently measured by Moser et al. [Phys. Rev. Lett. 84, 2674 (2000)] in the quasi-one-dimensional organic conductor (TMTSF)2PF6 are quantitatively compared with our previous theoretical calculations [Synth. Met. 103, 2202 (1999); Eur. Phys. J. B 11, 385 (1999)]. We find a good agreement, albeit not with a fully consistent set of parameters for the two quantities, without appealing to the Luttinger liquid concept.Comment: 2 pages with 2 figures for ICSM-2000 proceedings. Uses elsart.cls and synmet.cls, which are provided. V.2: one reference update

Anomalous temperature dependence of resistivity in quasi-one-dimensional conductors in a strong magnetic field

We present a heuristic, semiphenomenological model of the anomalous temperature (T) dependence of resistivity Rxx recently observed experimentally in the quasi-one-dimensional (Q1D) organic conductors of the (TMTSF)2X family in moderately strong magnetic fields. We suggest that a Q1D conductor behaves like an insulator (dRxx/dT<0), when its effective dimensionality is one, and like a metal (dRxx/dT>0), when its effective dimensionality is greater than one. Applying a magnetic field reduces the effective dimensionality of the system and switches the temperature dependence of resistivity between the insulating and metallic laws depending on the magnitude and orientation of the magnetic field. We critically analyze whether various microscopic models suggested in literature can produce such a behavior and find that none of the models is fully satisfactory. In particular, we perform detailed analytical and numerical calculations within the scenario of magnetic-field-induced spin-density-wave precursor effect suggested by Gor'kov and find that the theoretical results do not agree with the experimental observations.Comment: RevTeX, 17 pages, 7 figures. v.2: minor corrections; references are added and updated v.3: minor corrections as in the published versio

Marginal Fermi Liquid with a Two-Dimensional Patched Fermi Surface

We consider a model composed of Landau quasiparticle states with patched Fermi surfaces (FS) sandwiched by states with flat FS to simulate the ``cold'' spot regions in cuprates. We calculate the one particle irreducible function and the self-energy up to two-loop order. Using renormalization group arguments we show that in the forward scattering channel the renormalized coupling constant is never infrared stable due to the flat FS sectors. Furthemore we show that the self-energy scales with energy as ${\rm Re} \Sigma \sim \omega \ln \omega$ as $\omega \to 0$, and thus the Fermi liquid state within each FS patch is turned into a marginal Fermi liquid.Comment: 5 pages, 3 ps figure

Contemporary labour migration and talent management in the global hotel industry

The hospitality industry is forecast to experience further growth, which will be particularly evident in terms of the development and expansion of major hotel chains. However, with a growing concern over skills and labour shortages across both developed and developing countries, there is the question of how these shortages can be addressed, and some of the increasingly utilised solutions are the use of migrant labour as well as the concept of Talent Management. This research explores the practices used by a global hotel organisation for employing migrant labour across different countries and at different levels - from operational level through to senior management level. This research benefited from the assistance of a global hotel organisation. This unprecedented access was the opportunity to find out about the human resource practices of a global hotel organisation within different cultural contexts. The research draws on data collected through semi-structured interviews with senior managers above country level, and also hotel managers and employees from three different countries, including Russia, Turkey and the UK. Limitations include the scope of the research being restricted primarily to the capitals and large cities; small samples in case of each of the selected countries, and the restricted opportunity to conduct interviews with migrant workers in some of the cases. Findings reveal significant differences in the employment and perceptions of different groups or segments of migrant workers across the organisation, with the practices being influenced by a number of external and internal factors. Using the labour market theory, the research explains the variations in the use and subsequent treatment of different groups of migrant workers as well as how migrant workers can be used more effectively. Implications for practice are considered. The research makes the following key contributions. First, it combines two subject areas, including labour migration and the process of internationalisation in the global hotel industry. This adds to the understanding of how global hotel organisations manage their human resources, particularly in relation to migrant labour, across different countries. Second, the research uses the labour market theory to explain the current practices for using migrant labour. This contributes to the understanding of the differences in the use and subsequent treatment of varying categories of migrant labour. Third, the research provides a new definition of 'migrant worker' through the examination of the identified categories of migrant workers

Finite volume and pseudo-spectral schemes for the fully nonlinear 1D Serre equations

After we derive the Serre system of equations of water wave theory from a generalized variational principle, we present some of its structural properties. We also propose a robust and accurate finite volume scheme to solve these equations in one horizontal dimension. The numerical discretization is validated by comparisons with analytical, experimental data or other numerical solutions obtained by a highly accurate pseudo-spectral method.Comment: 28 pages, 16 figures, 75 references. Other author's papers can be downloaded at http://www.denys-dutykh.com