2,627 research outputs found
Social Support Seeking And Early Adolescent Depression And Anxiety Symptoms: The Moderating Role Of Rumination
This study examined how social support seeking and rumination interacted to predict depression and anxiety symptoms 6 months later in early adolescents (N = 118; 11-14 years at baseline). We expected social support seeking would be more helpful for adolescents engaging in low rather than high levels of rumination. Adolescents self-reported on all measures at baseline, and on depression and anxiety symptoms 6 months later. Social support seeking predicted fewer symptoms of depression and anxiety at low rumination levels but was not associated with benefits as rumination increased. For depression symptoms, social support seeking predicted more symptoms at high rumination levels. Results were stronger for emotion-focused than problem-focused support seeking and for depression compared with anxiety symptoms. These findings suggest that cognitive risk factors like rumination may explain some inconsistencies in previous social support literature, and highlight the importance of a nuanced approach to studying social support seeking
Lattice effects and current reversal in superconducting ratchets
Competition between the vortex lattice and a lattice of asymmetric artificial
defects is shown to play a crucial role in ratchet experiments in
superconducting films. We present a novel and collective mechanism for current
reversal based on a reconfiguration of the vortex lattice. In contrast to
previous models of vortex current reversal, the mechanism is based on the
global response of the vortex lattice to external forces.Comment: 12 pages, 7 figure
Topological defects and misfit strain in magnetic stripe domains of lateral multilayers with perpendicular magnetic anisotropy
Stripe domains are studied in perpendicular magnetic anisotropy films
nanostructured with a periodic thickness modulation that induces the lateral
modulation of both stripe periods and inplane magnetization. The resulting
system is the 2D equivalent of a strained superlattice with properties
controlled by interfacial misfit strain within the magnetic stripe structure
and shape anisotropy. This allows us to observe, experimentally for the first
time, the continuous structural transformation of a grain boundary in this 2D
magnetic crystal in the whole angular range. The magnetization reversal process
can be tailored through the effect of misfit strain due to the coupling between
disclinations in the magnetic stripe pattern and domain walls in the in-plane
magnetization configuration
Moving forward through consensus: protocol for a modified Delphi approach to determine the top research priorities in the field of orthopaedic oncology.
IntroductionOrthopaedic oncology researchers face several obstacles in the design and execution of randomised controlled trials, including finite fiscal resources to support the rising costs of clinical research and insufficient patient volume at individual sites. As a result, high-quality research to guide clinical practice has lagged behind other surgical subspecialties. A focused approach is imperative to design a research programme that is economical, streamlined and addresses clinically relevant endpoints. The primary objective of this study will be to use a consensus-based approach to identify research priorities for international clinical trials in orthopaedic oncology.Methods and analysisWe will conduct a 3-phase modified Delphi method consisting of 2 sequential rounds of anonymous web-based questionnaires (phases I and II), and an in-person consensus meeting (phase III). Participants will suggest research questions that they believe are of particular importance to the field (phase I), and individually rate each proposed question on 5 criteria (phase II). Research questions that meet predetermined consensus thresholds will be brought forward to the consensus meeting (phase III) for discussion by an expert panel. Following these discussions, the expert panel will be asked to assign scores for each research question, and research questions meeting predetermined criteria will be brought forward for final ranking. The expert panel will then be asked to rank the top 3 research questions, and these 3 research questions will be distributed to the initial group of participants for validation.Ethics and disseminationAn ethics application is currently under review with the Hamilton Integrated Research Ethics Board in Hamilton, Ontario, Canada. The results of this initiative will be disseminated through peer-reviewed publications and conference presentations
Rare decay via scalar leptoquark doublets
A calculation of the one-loop contribution to the rare three-body flavor
changing neutral current top quark decay is presented in
the framework of models with one or more scalar leptoquark doublets
with hypercharge . Analytical expressions for the invariant amplitude of
the generic decay , with a lepton or quark,
are presented in terms of Passarino-Veltman integral coefficients, from which
the amplitudes for the processes and follow easily. An analysis of the current constraints on
the parameter space is presented in the scenario with only one scalar LQ
doublet and bounds on the LQ couplings are obtained from the muon
anomaly, the lepton flavor violating (LFV) decay and extra
constraints meant to avoid tension between theory predictions and experimental
data. For a LQ with a mass in the range of -- TeVs, the estimate -- is obtained for the largest
allowed values of the LQ coupling constants, which means that this decay would
be below the reach of future experimental measurements. We also consider an
scenario with three scalar doublets, which was recently proposed to explain the
lepton flavor universality violation anomalies in decays as well as the
muon anomaly. Although this scenario allows large LQ couplings to the tau
lepton and the and quarks, the branching ratio of the decay is also of the order of -- for LQ
masses of 1.7 TeV.Comment: In preparation for Journal Submissio
Los procesos de construcción de conocimiento agroecológico y la transición hacia agricultura más sustentables en Jalisco, México
El presente trabajo parte de la noción de multifuncionalidad en la agricultura familiar sustentable, y se detiene a analizar la función cultural de la agricultura en la construcción de conocimiento agroecológico en dos experiencias de la región centro de Jalisco. Además, muestra la relevancia de las articulaciones entre diferentes actores sociales para formar redes de construcción e intercambio de conocimientos agroecológicos que fortalecen la transición hacia agriculturas más sustentables y más justas para los agricultores familiares.ITESO A
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