Leading-order hadronic contribution to the anomalous magnetic moment of the muon from N_f=2+1+1 twisted mass fermions

We present results for the leading order QCD correction to the anomalous magnetic moment of the muon including the first two generations of quarks as dynamical degrees of freedom. Several light quark masses are examined in order to yield a controlled extrapolation to the physical pion mass. We analyse ensembles for three different lattice spacings and several volumes in order to investigate lattice artefacts and finite-size effects, respectively. We also provide preliminary results for this quantity for two flavours of mass-degenerate quarks at the physical value of the pion mass.Comment: 7 pages, 7 figures, presented at the 31st International Symposium on Lattice Field Theory (Lattice 2013), 29 July - 3 August 2013, Mainz, German

Four-Flavour Leading-Order Hadronic Contribution To The Muon Anomalous Magnetic Moment

We present a four-flavour lattice calculation of the leading-order hadronic vacuum polarisation contribution to the anomalous magnetic moment of the muon, $a_\mathrm{\mu}^{\rm hvp}$, arising from quark-connected Feynman graphs. It is based on ensembles featuring $N_f=2+1+1$ dynamical twisted mass fermions generated by the European Twisted Mass Collaboration (ETMC). Several light quark masses are used in order to yield a controlled extrapolation to the physical pion mass. We employ three lattice spacings to examine lattice artefacts and several different volumes to check for finite-size effects. Incorporating the complete first two generations of quarks allows for a direct comparison with phenomenological determinations of $a_\mathrm{\mu}^{\rm hvp}$. Our final result including an estimate of the systematic uncertainty $$a_{\mathrm{\mu}}^{\rm hvp} = 6.74(21)(18) \cdot 10^{-8}$$ shows a good overall agreement with these computations.Comment: 24 pages, 11 figures, accepted for publication in JHE

Schema therapy for chronic depression: Results of a multiple single case series

Background and Objectives: The aim of this study was to test the effects of individual schema therapy (ST) for patients with chronic depression. Methods: Using a multiple-baseline single case series design, patients with chronic major depressive disorder (N = 25) first entered a 6 to 24 weeks baseline phase; this phase functioned as a no-treatment control condition. Then, patients started a 12 week exploration phase during which symptoms and underlying schemas were explored; this phase functioned as an attention control condition. Next, patients received up to 65 sessions of individual ST. The Beck Depression Inventory II (BDI-II) and the Quick Inventory of Depressive Symptomatology (QIDS) were the primary outcome measures. The BDI-II was assessed once a week during all phases of the study resulting in 100 repeated assessments per participant on average. Mixed regression analysis was used to contrast change in symptoms during the intervention with change in symptoms during the baseline and exploration control phases. Results: When compared to the no-treatment control period, the intervention had a significant, large effect on depressive symptoms (Cohen’s d BDI-II = 1.30; Cohen’s d QIDS = 1.22). Effects on secondary continuous outcomes were moderate to large. Limitations: The small sample size and lack of a control group. Conclusions: These findings provide evidence that ST might be an effective treatment for patients with chronic depression

Nonperturbative QCD corrections to electroweak observables

Nonperturbative QCD corrections are important to many low-energy electroweak observables, for example the muon magnetic moment. However, hadronic corrections also play a significant role at much higher energies due to their impact on the running of standard model parameters, such as the electromagnetic coupling. Currently, these hadronic contributions are accounted for by a combination of experimental measurements and phenomenological modeling but ideally should be calculated from first principles. Recent developments indicate that many of the most important hadronic corrections may be feasibly calculated using lattice QCD methods. To illustrate this, we will examine the lattice computation of the leading-order QCD corrections to the muon magnetic moment, paying particular attention to a recently developed method but also reviewing the results from other calculations. We will then continue with several examples that demonstrate the potential impact of the new approach: the leading-order corrections to the electron and tau magnetic moments, the running of the electromagnetic coupling, and a class of the next-to-leading-order corrections for the muon magnetic moment. Along the way, we will mention applications to the Adler function, the determination of the strong coupling constant and QCD corrections to muonic-hydrogen

Deleted in Malignant Brain Tumors 1 (DMBT1) is present in hyaline membranes and modulates surface tension of surfactant

This is an Open Access article distributed under the terms of the Creative Commons Attribution Licens

Qualidade de vida em sujeitos com lesão medular: uma revisão sistemática

O objetivo desse estudo foi analisar e investigar a qualidade de vida em pessoas com lesão medular, através de uma revisão sistemática. Buscou-se os principais trabalhos publicados no período de 2006 a 2019, nas bases de dados CAPES e Scielo. Todos estudos utilizaram medidores quantitativos sobre qualidade de vida, sendo eles o WHOQOL-Bref e o SF-36. Os resultados de forma geral mostraram que o sujeito com lesão medular avalia sua qualidade de vida como boa e sua saúde de forma geral satisfatória. Sendo que o domínio físico foi citado nas pesquisas como um fator negativo, sendo ele relacionado com a questão da acessibilidade. Verificou-se que estudos futuros são de extrema importância, para compreender a qualidade de vida nesses indivíduos, assim como para a melhoria de políticas públicas para questão de acessibilidade e autonomia desses sujeitos

Fracture resistance of hybrid PP/elastomer/wood composites

PP was modified with elastomer and wood to prepare materials with large stiffness and impact resistance. Three wood fibers with different particle characteristics were used, and elastomer as well as wood content changed in a wide range. Interfacial adhesion was modified through the use of maelated polypropylene (MAPP) coupling agent. The structure of ternary PP/elastomer/wood composites was manipulated by the use of functionalized polymers and processing conditions. Considerable embedding of the wood into the elastomer was achieved in some cases depending on the variables. Wood increases impact resistance slightly, elastomer drastically in two-component composites and blends, but fracture toughness remains small in three-component hybrid systems irrespectively of structure. Depending on particle size and interfacial adhesion fiber fracture and debonding occur in wood reinforced composites, mainly plastic deformation takes place in blends. This latter process is suppressed by cavitation promoted further by the presence of wood fibers which increase local stresses. The usual concept of three-component materials does not work in wood composites, micromechanical deformations must be controlled to diminish or completely eliminate cavitation and to increase the plastic deformation of the matrix polymer