Supersolid phases in a realistic three-dimensional spin model

Supersolid phases, in which a superfluid component coexists with conventional crystalline long range order, have recently attracted a great deal of attention in the context of both solid helium and quantum spin systems. Motivated by recent experiments on 2H-AgNiO$_2$, we study the magnetic phase diagram of a realistic three-dimensional spin model with single-ion anisotropy and competing interactions on a layered triangular lattice, using classical Monte Carlo simulation techniques, complemented by spin-wave calculations. For parameters relevant to experiment, we find a cascade of different phases as a function of magnetic field, including three phases which are supersolids in the sense of Liu and Fisher. One of these phases is continuously connected with the collinear ground state of AgNiO$_2$, and is accessible at relatively low values of magnetic field. The nature of this low-field transition, and the possibility of observing this new supersolid phase in AgNiO$_2$, are discussed.Comment: 4+\epsilon pages, 5 eps figures; minor revisions; accepted for publication in Phys. Rev. Let

Postural Control in Preschool Children with Developmental Coordination Disorder, in Sitting Position During a Functional Task

The developmental coordination disorder is a motor disorder that affects 5 to 6% of children at school-age. The postural control deficit is one of the most prevalent problems affecting 73 to 87% of these children. The present research aims to analyze and compare postural control in probable (p-DCD) and at- risk of developmental coordination disorder children and in typical children in a sitting position during a functional task. p-DCD children were tendentially less recurrent, less periodic, simpler and more regular. These children oscillated more and faster in conditions with visual information; with a visual focus they had more stability and oscillated less and slowler campared to the baseline; without visual information they reduced their oscillations and velocity and become less recurrent, periodic, stable and simpler, possibly freenzing more degrees of freedom in order to respond to absence of external information. p-DCD seem to be more dependent on external stimulus like visual information to auto organize their own balance. The greater the task’s complexity, the lesser and slower their oscillations were but also more recurrent and periodic. Despite oscillating, more and faster in all conditions and being tendentially more recurrent and periodic, in risk children revealed a behaviour pattern similar to typical in both variables. p-DCD, at-risk and typical children reveal the same manner of action without visual information, less and slower oscillations. Most likely, the problem with p-DCD is not in motor control, but on perception-action cycles’ effectivness; and, where stimulation must be focused.info:eu-repo/semantics/publishedVersio

Statistical translation invariance protects a topological insulator from interactions

We investigate the effect of interactions on the stability of a disordered, two-dimensional topological insulator realized as an array of nanowires or chains of magnetic atoms on a superconducting substrate. The Majorana zero-energy modes present at the ends of the wires overlap, forming a dispersive edge mode with thermal conductance determined by the central charge $c$ of the low-energy effective field theory of the edge. We show numerically that, in the presence of disorder, the $c=1/2$ Majorana edge mode remains delocalized up to extremely strong attractive interactions, while repulsive interactions drive a transition to a $c=3/2$ edge phase localized by disorder. The absence of localization for strong attractive interactions is explained by a self-duality symmetry of the statistical ensemble of disorder configurations and of the edge interactions, originating from translation invariance on the length scale of the underlying mesoscopic array.Comment: 5+2 pages, 8 figure

National case study: Portugal

info:eu-repo/semantics/publishedVersio

Policies of accountability in Portugal

This communication stems from the global/local method proposed by Pinar (2006) for analysing changes that have affected curricular development in Portugal in the globalised context. It is argued that the most evident effects of globalisation on current curricular changes relate to homogenisation and standardisation (Anderson-Levitt, 2008), intersected by key concepts, such as accountability, good practices, quality, efficiency, evaluation and testing, amongst others, even though heterogeneity of practices persists. In Portugal, the political agenda has suffered a two-fold pressure – on one side, from globalisation and transnationalisation and, on the other, the trend to Europeanise educational policies – leading to processes of curricular re-centralisation and a performance-oriented culture in schools (Ball, 2004). The concept of accountability is seen as one of the central aspects for understanding this, so this text uses a series of reflective questions, organised in three regulatory dimensions - political, institutional and pedagogical - to analyse the concept of accountability

Exploratory study on maturation and competition level in young karate practitioners

Emparelhar crianças propicia sucesso e reduz lesões no desporto. Apesar das diferenças de maturação entre crianças, a idade cronológica mantém-se o principal critério para equalizar os níveis de competição, mas com uma eficiência limitada. No entanto, no karaté, o peso também é considerado. Fomos verificar se existe associação entre a idade cronológica e os indicadores maturacionais e, encontrar modelos simples que permitam colocar em reflexão novas formas de avaliação da maturação. Foram recolhidos dados em 54 jovens praticantes de karaté (idade: 12,67 ± 2,49 anos; experiência: 4,99 ± 2,44 anos; altura: 150,45 ± 15,25cm; peso: 43,09 ± 14,17 kg, 20 raparigas). A idade correlacionou-se significativamente com auto-observação da maturação sexual (rho = 0,838; p < 0,01), e foi possível encontrar modelos de regressão simples que têm uma explicação moderada na maturação, apenas utilizando variáveis de medição simples, tal como a altura, o peso e o perímetro do braço. Estes resultados devem levar as entidades competentes a refletir acerca do modo de emparelhamento dos atletas nas competições de uma forma justa em termos de maturação.Paring children improve the chance for success and reduce injury in sport. Despite the maturity differences between children, chronological age remains the main criterion to equalize competition levels, but with limited efficiency. However, in Karate, weight is also considered. We went to investigate the association between chronological age and maturational indicators and find simple models to put on reflection new ways to assess the maturity. Data were collected in 54 young Karate practitioners (age: 12.67 ± 2.49 years, experience: 4.99 ± 2.44 years, height: 150.45 ± 15.25 cm, weight: 43.09 ± 14, 17 kg, 20 girls). Age correlated significantly with self-observation of sexual maturation (rho = 0.838; p < 0.01), and it was possible to find simple regression models that have a moderate explanation in maturation, using only simple measurable variables such as the height, weight and arm circumference. These results should lead the competent entities to reflect on the way of pairing of the athletes in the competitions, in a fair way in terms of maturation.info:eu-repo/semantics/publishedVersio

Multi-model adaptive predictive control system for automated regulation of mean blood pressure

After cardiac surgery operation, severe complications may occur in patients due to hypertension. To decrease the chances of complication it is necessary to reduce elevated mean arterial pressure (MAP) as soon as possible. Continuous infusion of vasodilator drugs, such as sodium nitroprusside (Nipride), it is used to reduce MAP quickly in most patients. For maintaining the desired blood pressure, a constant monitoring of arterial blood pressure is required and a frequently adjust on drug infusion rate. The manual control of arterial blood pressure by clinical professionals it is very demanding and time consuming, usually leading to a poor control quality of the hypertension. The objective of the study is to develop an automated control procedure of mean arterial pressure (MAP), during acute hypotension, for any patient, without changing the controller. So, a multi-model adaptive predictive methodology was developed and, for each model, a Predictive Controller can be a priori designed (MMSPGPC). In this paper, a sensitivity analysis was performed and the simulation results showed the importance of weighting factor (phi), which controls the initial drug infusion rate, to prevent hypotension and thus preserve patient's health. Simulation results, for 51 different patients, showed that the MMSPGPC provides a fast control with mean settling time of 04:46 min, undershoots less than 10 mmHg and steady-state error less than +/- 5 % from the MAP setpoint.The authors of this article would like to thank Federal Institute of Rio Grande do Norte for support and University of Minho for structure, which to made possible the development of the research

P02-12 The implementation cost of a walking football exercise program for patients with type 2 diabetes: a case study of SWEET-Football (Portugal)

Background Economic analysis of health interventions is essential to the development and implementation of sustainable health policies, especially in noncommunicable diseases area. Type 2 diabetes (T2D) is one of the most relevant noncommunicable diseases globally. Regular physical activity is an established cornerstone of T2D control, with benefits in glycemic control, cardiovascular risk factors and quality of life. Thus, the current study aimed to assess the cost of a community-based physical activity intervention for patients with T2D. Methods We assessed the SWETT-Football program - a community-based walking football exercise program for middle-aged and older male patients with T2D. The program was tested in Portugal through a scientific project (NCT03810846) funded by FIFA (FIFA Research Scholarship 2018). One season of this program consists of three sessions per week (60 minutes per session) during nine months (October to June). For the calculations, we considered a total of 40 patients (two groups of 20). We calculated the direct costs of one season for the host institution: 216 hours of renting a sports hall and hiring human resources (a football coach and a nurse); cardiac stress tests and sports insurance for the participants; sports equipment (balls, cones, vests); vital signs monitoring equipment (blood pressure, heart rate and capillary blood glucose); logistical equipment (disposable and non-disposable); and technical training. In addition, we considered an economic depreciation of five years for sports and electronic materials. Cost analysis dated January 2022. Results One season of this program for 40 patients with T2D was estimated to have a total implementation cost of 11,026.51€: 1,225.17€/month; 275.66€/patient; 51.05€/session; 30.63€/patient/month; and 2.55€/patient/session. Conclusions A community-based walking football program for patients with T2D has an affordable cost and is feasible for large-scale implementation by local communities with the involvement of football clubs, municipalities and primary health care units, promoting physical activity and contributing to T2D control