The high-temperature expansion of the classical Ising model with S_z^2 term

We derive the high-temperature expansion of the Helmholtz free energy up to the order \beta^{17} of the one-dimensional spin-S Ising model, with single-ion anisotropy term, in the presence of a longitudinal magnetic field. We show that the values of some thermodynamical functions for the ferromagnetic models, in the presence of a weak magnetic field, are not small corrections to their values with h=0. This model with S=3 was applied by Kishine et al. [J.-i. Kishine et al., Phys. Rev. B, 2006, 74, 224419] to analyze experimental data of the single-chain magnet [Mn (saltmen)]_2 [Ni(pac)_2 (py)_2] (PF_6)_2 for T<40 K. We show that for T<35 K the thermodynamic functions of the large-spin limit model are poor approximations to their analogous spin-3 functions.Comment: 10 pages, 3 figure

Species richness and beta-diversity of aquatic macrophytes assemblages in three floodplain tropical lagoons: evaluating the effects of sampling size and depth gradients

Using aquatic macrophyte data gathered in three lagoons of the Paraná River floodplain we showed a strong effect of sample size on species richness. Incidence-based species richness estimators (Chao 2, jackknife 1, jackknife 2, incidence-based coverage estimator and bootstrap) were compared to evaluate their performance in estimating the species richness throughout transect sampling rnethod. Our results suggest that the best estimate of the species richness was gave by jackknife 2 estimator. Nevertheless, the transect sampling design was considered inappropriate to estimate aquatic macrophytes species richness. Depth gradient was not a good predictor of the species richness and species turnover (beta diversity). The dynamics of these environments, subject to high water-level fluctuation prevents the formation and permanence of a clear floristic depth-related gradient

Issue 17: Private Sponsorship in Canada: The Resettlement of Syrian Refugees in the Kitchener-Waterloo Region

The number of refugees in need of resettlement in the world is estimated to surpass 1.44 million people in 2020, with Syrians currently representing 40% of refugees in need of resettlement. In late 2015, the Canadian government made a commitment to resettle 25,000 Syrian refugees and, since then, there has been abundant research analysing the large-scale resettlement process, its successes, limitations, and lessons for future policymaking and host communities. This Policy Points contributes to these analyses by unpacking the particular lessons from the Kitchener-Waterloo region, and highlighting the resettlement experiences of privately sponsored Syrian refugees in this area. It draws on policy, program, and scholarly documents, and on a selection of 55 semi-structured, in-depth interviews with mainly privately sponsored (and some government-assisted) Syrian refugees on their experiences of resettlement in southern Ontario, Canada. In this Policy Points, we emphasize that strong leadership by governments and civil society groups and organizations is crucial in the private sponsorship of Syrians, and that more policy attention and research are needed to improve the private sponsorship program in the K-W region

A brief overview of current drug repurposing approaches for COVID-19 management

This brief overview is intended to shed light on the current drug repositioning (also called drug repurposing) in the therapeutics of the novel coronavirus disease which emerged in 2019 (COVID-19). In this sense, the repositioning drugs for new indications can offer a better risk-versus-reward trade-off when compared to other drug development strategies, given that it makes use of drugs whose safety profile are already understood. Nonetheless, this approach allows healthcare professionals to promptly tackle the disease by investigating readily available drugs against it