Slow Magnetic Relaxation of Dy Adatoms with In-Plane Magnetic Anisotropy on a Two-Dimensional Electron Gas

We report on the magnetic properties of Dy atoms adsorbed on the (001) surface of SrTiO3. X-ray magnetic circular dichroism reveals slow relaxation of the Dy magnetization on a time scale of about 800 s at 2.5 K, unusually associated with an easy-plane magnetic anisotropy. We attribute these properties to Dy atoms occupying hollow adsorption sites on the TiO2-terminated surface. Conversely, Ho atoms adsorbed on the same surface show paramagnetic behavior down to 2.5 K. With the help of atomic multiplet simulations and first-principles calculations, we establish that Dy populates also the top-O and bridge sites on the coexisting SrO-terminated surface. A simple magnetization relaxation model predicts these two sites to have an even longer magnetization lifetime than the hollow site. Moreover, the adsorption of Dy on the insulating SrTiO3 crystal leads, regardless of the surface termination, to the formation of a spin-polarized two-dimensional electron gas of Ti 3dxy character, together with an antiferromagnetic Dy-Ti coupling. Our findings support the feasibility of tuning the magnetic properties of the rare-earth atoms by acting on the substrate electronic gas with electric fields.We acknowldege funding from the National Research Council (CNR) within the CNR/CAS Cooperative Programme project "Advanced characterization methods for the study of rare-earth single-ion magnets on oxide substrates", from the Czech Academy of Sciences (Mobility Plus Project No. CNR-19-03), and from the Swiss National Science Foundation (200020_176932 and 200021_175941). ICN2 was funded by the CERCA Programme/Generalitat de Catalunya and supported by the Spanish Ministry of Economy and Competitiveness, MINECO (grant nos. SEV-2017-0706 and PID2019-107338RB-C65/AEI/10.13039/501100011033). IMDEA Nanociencia acknowledges support from the Severo Ochoa Programme for Centres of Excellence in R&D (MINECO, grant SEV-2016-0686).Peer reviewe

Mining Spatial Association Rules in Census Data: A Relational Approach

In this paper we propose a method for the discovery of spatial association rules, that is, association rules involving spatial relations among (spatial) objects. The method is based on a multi-relational data mining approach and takes advantages of the representation and reasoning techniques developed in the field of Inductive Logic Programming (ILP). In particular, the expressive power of predicate logic is profitably used to represent spatial relations and background knowledge (such as spatial hierarchies and rules for spatial qualitative reasoning) in a very elegant, natural way. The integration of computational logics with efficient spatial database indexing and querying procedures permits applications that cannot be tackled by traditional statistical techniques in spatial data analysis. The proposed method has been implemented in the ILP system SPADA (Spatial Pattern Discovery Algorithm). We report the preliminary results on the application of SPADA to Stockport census data

Pharmacokinetic evaluation of bazedoxifene for the treatment of osteoporosis.

INTRODUCTION:Bazedoxifene is a third-generation Selective Estrogen Receptor Modulator, developed on raloxifene's model, and investigated as treatment for postmenopausal osteoporosis and menopause management. Clinical trial have shown that bazedoxifene is effective as raloxifene in preventing bone loss in women at risk of osteoporosis and that in patients with osteoporosis it is effective in reducing the incidence of new vertebral fracture with a protection maintained for up 7 years.AREAS COVERED:This drug evaluation presents the antifracture efficacy of bazedoxifine and evidence that it, unlike raloxifene, can reduce the rate of non-vertebral fractures in high-risk patients. The authors also review the effects of bazedoxifine has on reproduction tissues as well as the on lipid pattern. Additionally, the authors present the safety profile of bazedoxifine and discuss its prospects, specifically in relation to conjugated estrogen.EXPERT OPINION:Despite its peculiar profile, bazedoxifene could be considered as a second-line therapy for women < 65 - 70 years of age, where bisphopshonates are contraindicated or not well tolerated. Furthermore, the authors believe that bazedoxifene could also have its place as a first-line therapy for younger postmenopausal patients in the management of menopause and prevention of osteoporosis; this could be prescribed either by itself or in combination with conjugated estrogen. The authors also highlight the fact that the association of bazedoxifene and conjugated estrogen could also be beneficial in the treatment of climacteric syndrome in patients with menopausal symptoms

Role of Colourcoded Doppler Ultrasonography in the Evaluation of Patients With Peyronie's Disease

From March 1995 to February 1996, sixteen consecutive patients with Peyronie's Disease (PD) were routinely submitted to penile dynamic colour-coded doppler ultrasonography (CCDU). The test yielded normal results in 6 patients who had no erectile problems and in other 4 patients who conversely complained of reduced erectile function. In the other 6 patients who complained of reduced erectile function, the test pointed out pure arteriogenic failure in 1 case, pure venogenic failure in 4, and mixed arteriogenic and venogenic failure in 1. CCDU enables a precise assessment of erectile function as well of the site, kind and entity of the penile curvature to be corrected. These data are very useful when planning the surgical approach for each patient