Progress in Written Language Bursts,Pauses, Transcription,and Written Composition Across Schooling     

Rui A. Alves  Teresa Limpo 《Scientific Studies of Reading》2015,19(5):374-391

  相似文献   

Extensional flow of blood analog solutions in microfluidic devices     

P. C. Sousa  F. T. Pinho  M. S. N. Oliveira    M. A. Alves 《Biomicrofluidics》2011,5(1)

In this study, we show the importance of extensional rheology, in addition to the shear rheology, in the choice of blood analog solutions intended to be used in vitro for mimicking the microcirculatory system. For this purpose, we compare the flow of a Newtonian fluid and two well-established viscoelastic blood analog polymer solutions through microfluidic channels containing both hyperbolic and abrupt contractions∕expansions. The hyperbolic shape was selected in order to impose a nearly constant strain rate at the centerline of the microchannels and achieve a quasihomogeneous and strong extensional flow often found in features of the human microcirculatory system such as stenoses. The two blood analog fluids used are aqueous solutions of a polyacrylamide (125 ppm w∕w) and of a xanthan gum (500 ppm w∕w), which were characterized rheologically in steady-shear flow using a rotational rheometer and in extension using a capillary breakup extensional rheometer (CaBER). Both blood analogs exhibit a shear-thinning behavior similar to that of whole human blood, but their relaxation times, obtained from CaBER experiments, are substantially different (by one order of magnitude). Visualizations of the flow patterns using streak photography, measurements of the velocity field using microparticle image velocimetry, and pressure-drop measurements were carried out experimentally for a wide range of flow rates. The experimental results were also compared with the numerical simulations of the flow of a Newtonian fluid and a generalized Newtonian fluid with shear-thinning behavior. Our results show that the flow patterns of the two blood analog solutions are considerably different, despite their similar shear rheology. Furthermore, we demonstrate that the elastic properties of the fluid have a major impact on the flow characteristics, with the polyacrylamide solution exhibiting a much stronger elastic character. As such, these properties must be taken into account in the choice or development of analog fluids that are adequate to replicate blood behavior at the microscale.  相似文献   

Book-Sharing for Parenting and Child Development in South Africa: A Randomized Controlled Trial     

Nicholas Dowdall  Lynne Murray  Sarah Skeen  Marguerite Marlow  Leonardo De Pascalis  Frances Gardner  Mark Tomlinson  Peter J. Cooper 《Child development》2021,92(6):2252-2267

This study evaluated the impact of a parenting intervention on children’s cognitive and socioemotional development in a group of caregivers and their 21-to-28-month-old children in a low-income South African township. A randomized controlled trial compared an experimental group (n = 70) receiving training in dialogic book-sharing (8 weekly group sessions) with a wait-list control group (n = 70). They were assessed before the intervention, immediately following it, and at a six month follow-up. The intervention had positive effects on child language and attention, but not behavior problems, prosocial behavior, or theory of mind. Intervention caregivers were less verbally and psychologically harsh, showed more sensitivity and reciprocity and more complex cognitive talk. This program benefitted parenting and child development and holds promise for low-income contexts.  相似文献   

Academic staff quality in higher education: an empirical analysis of Portuguese public administration education     

Cláudia S. Sarrico  André A. Alves 《Higher Education》2016,71(2):143-162

  相似文献   

International inspiration and national aspirations: inclusive education in Portugal     

Ines Alves 《International Journal of Inclusive Education》2019,23(7-8):862-875

ABSTRACT

This article critically analyses the recent developments and changes towards Inclusive Education in Portugal, through a policy analysis that includes the last three legislative frameworks. These policies will be analysed within their cultural and historical context, to explore the similarities and differences in the conceptualisations of diversity and inclusion; and the influence of international policies in the national policies that regulate the Portuguese schools’ role in ensuring education for all. The 2018 policies aim to ensure that all students, regardless of their personal and social situation, have access and participate in an inclusive school, which aligns with the Salamanca Statement and Framework for Action (1994).  相似文献   

Initial teacher education in the university ‘My little ship,how ill-laden you are’     

Leonardo Franchi 《欧洲师范教育杂志》2016,39(2):147-158

Initial teacher education programmes in universities must meet the needs of varying constituencies. Politicians, school leaders and academics, for example, understandably seek to influence how these programmes should look. Given the importance of well-qualified teachers for the building of effective schools, it is right that a range of stakeholders should have their say. The Donaldson Report on teacher education in Scotland (2011) has much to say regarding the academic content of teacher education programmes. It offers food for thought for those wedded to the ‘craft’ model of teacher education. Academic rigour and breadth of experience cannot be seen as inimical to the need to ensure that newly qualified teachers are, indeed, ready to teach. The rediscovery of liberal approaches to education studies and the value of the liberal arts can be key components of a reimagined teacher education process.  相似文献   

Exploring affiliation network models as a collaborative filtering mechanism in e-learning     

Daniel Rodríguez  Miguel Ángel Sicilia  Salvador Sánchez-Alonso  Leonardo Lezcano  Elena García-Barriocanal 《Interactive Learning Environments》2013,21(4):317-331

The online interaction of learners and tutors in activities with concrete objectives provides a valuable source of data that can be analyzed for different purposes. One of these purposes is the use of the information extracted from that interaction to aid tutors and learners in decision making about either the configuration of further learning activities or the filtering of learning resources. This article explores the use of an affiliation network model for such kind of purposes. Concretely, the use of techniques such as blockmodeling – a technique used to derive meaningful patterns of relationships in the network – and the analysis of m-slices – a technique helpful to study cohesion in relationships – are explored as tools to decide on the configuration of topics and/or learner groups. In particular, the results of the case study show that such techniques can be used to (i) filter participants for rearranging groups; (ii) rearrange topics of interest; and (iii) dynamically change the structure of a course. The techniques presented can be considered a case of collaborative filtering based on social network structure.  相似文献   

Impact of compliance with different guidelines on physical activity during pregnancy and perceived barriers to leisure physical activity     

Paula Clara Santos  Sandra Abreu  Carla Moreira  Diana Lopes  Rute Santos  Odete Alves 《Journal of sports sciences》2013,31(14):1398-1408

Abstract

The aims of the this prospective study were to analyse physical activity (PA) engagement during the first and second trimesters, considering the different guidelines published on PA, to document the individual characteristics associated with the accomplishment of these guidelines and to examine pregnant women’s perceived barriers to leisure PA, using a socioecological framework. A sample of 133 pregnant women in two stages – at 10–12 weeks’ gestation (T1) and 20–22 weeks’ gestation (T2) – were evaluated. PA was assessed by accelerometry during the T1 and T2 evaluation stages. Socio-demographic characteristics, lifestyle factors and barriers to leisure PA were assessed via questionnaire. A large proportion of women (ranging from 32% to 96%) did not reach the levels of PA recommended by the guidelines. There were no significant differences between T1 and T2 with regard to compliance with PA recommendations. A decrease in PA levels from T1 to T2 was noted for all recommendations. No associations were found between participants’ characteristics and adherence to the recommendations in T1 and T2. No significant differences were found in barriers to leisure PA between T1 and T2. The most commonly reported barriers to leisure PA were intrapersonal, not health related. Our results indicate that there were no differences between trimesters regarding compliance of PA recommendations, and perceived barriers were similar in both trimesters.  相似文献   

The role of prothrombotic factors in the ocular manifestations of abusive and non-abusive head trauma: a feasibility study     

Yu A  Stephens D  Feldman BM  Parkin PC  Kahr WH  Brandão LR  Shouldice M  Levin AV 《Child abuse & neglect》2012,36(4):333-341

  相似文献   

Rotary inverted pendulum with magnetically external perturbations as a source of the pendulum’s base navigation commands     

Gisela Pujol-Vazquez  Leonardo Acho  Saleh Mobayen  Amelia Nápoles  Vega Pérez 《Journal of The Franklin Institute》2018,355(10):4077-4096

The main objective of this paper is to drive a rotary inverted pendulum by following a desired navigation instruction. This navigation is commanded by the user through a new electromagnetic device which is allowed to perturb the pendulum from its upright position. This apparatus consists of an electronic magnetic driving circuit to introduce commands and realized via two operated magnetic coils. So, the external programmed magnetic perturbation can be seen as external commandments. Therefore, the control problem statement is solved via a modified regulation control implementation, to maintain the pendulum on its upright position and giving free manipulation of the base of the rotary inverted pendulum. Hence, by using the corresponding H_∞-linear matrix inequality technique, a static state controller is designed and tested experimentally so supporting our findings.  相似文献