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Katrin Mägi Marja-Kristiina LerkkanenAnna-Maija Poikkeus Helena Rasku-PuttonenJari-Erik Nurmi 《Learning and Instruction》2011,21(5):664-675
This longitudinal study investigated the cross-lagged associations between children’s academic skill development, task-avoidant behaviour in the context of homework, and parental beliefs about their child’s success from kindergarten to Grade 2. The participants were 1267 children. The children’s pre-skills were assessed at the end of the kindergarten year, and math and reading skills at the end of Grade 1 and Grade 2. Parents provided ratings of their beliefs about their children’s school success and task-avoidant behaviour with regard to homework at the end of Grades 1 and 2. The results showed that children’s math and reading skills predicted children’s task-avoidant behaviour regarding homework as rated by mothers, but not by fathers, when autoregressive effects were taken into account. In addition, task-avoidant behaviour predicted the mothers’ subsequent beliefs about their children’s school success but not vice versa. A reciprocal effect was found between fathers’ beliefs about success and children’s task-avoidance. 相似文献
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A number of studies have concluded that when students have greater confidence about their math skills and are aware of its
usefulness, they have a more positive perception of the subject. This article aims to examine whether this pseudo linear trend
in the relationship between affective and instrumental dimensions is also true of the university context. Special attention
is devoted to the articulation of these dimensions in structuring student perceptions of quantitative methods so as to identify
the various forms that this interaction can assume. Our second aim is to understand how the perceptions of these subjects
are constructed by students from degree courses in distinct scientific areas. Can we speak of group dynamics whereby socialization
within each degree course triggers the sharing of similar perceptions? We concluded that a certain linear trend can also be
identified in the university context in the relationship between the affective dimension and usefulness of quantitative methods
i.e., that the highest levels in the perception of the usefulness of these subjects corresponded to the highest levels of
self confidence and enjoyment of the subjects. However, in addition to this scenario there is another configuration in which
negative feelings coexist with the recognition of the usefulness of quantitative methods subjects. Namely, lower levels of
self confidence and enjoyment of these subjects can also be associated with high levels of perceived usefulness. We also concluded
that there is evidence of what we designated a certain course culture in the perceptions about quantitative methods. Nevertheless,
when our observation is extended to the scientific area the heterogeneity of the perceptions becomes evident. Another important
finding is the rejection of the thesis, at least in the university context, that defends the lack of self-confidence in quantitative
methods among females student. 相似文献
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Research on categories and markets suggests that audiences rely on categorical distinctions to make sense of market offerings. Market offerings that deviate from category norms risk devaluation. Although literature in this area has led to valuable insights, scholars have begun to question whether there has been an overemphasis on conformity, leaving existing theories ill-equipped to account for innovation. Within this context, we argue that research on authenticity in cultural sociology offers a useful platform for theorizing. We draw on the work of Peterson (1997), who underscores the importance of signals in evaluation. Objective features of market offerings (e.g., quality) matter, but particularly for innovations, these features are not readily visible. Because authentic producers are typically thought to be more committed, capable, and intrinsically motivated, when visibility of such objective features is lacking, authenticity may serve as an alternative indicator of value. Appearing authentic requires signaling believability with respect to category norms, while also being distinctive. Using data on 684 firms from five high technology sectors, we explore the relationship between authenticity and investor perceptions of value. Focusing on three different proxies for signals of authenticity—networks, governance, and narratives—we find a curvilinear association between conformity/distinctiveness and Tobin's q. Consistent with our view of authenticity as a signal, we also find that this relationship flattens as firms gain better track records and face stiffer competition. 相似文献
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M Martín-Matillas FB Ortega JR Ruiz D Martínez-Gómez G Vicente-Rodríguez A Marcos L Béghin A Kafatos M González-Gross M Zaccaria D Molnár S De Henauw M Sjöström LA Moreno MJ Castillo On Behalf Of The Helena Study 《Journal of sports sciences》2012,30(13):1329-1335
Abstract High physical fitness in childhood and adolescence is positively associated with favourable health-related outcomes. Our aim was to examine the relationship between relatives' (father, mother, brother, sister, and best friend) physical activity engagement and encouragement on adolescents' physical fitness. Adolescents were part of the HELENA study, a multi-centre study conducted in 10 cities from nine European countries in 2006-2008. Participants were 3288 adolescents (48% boys, 52% girls) aged 12.5-17.5 years with valid data on at least one of the three fitness variables studied: muscular strength (standing long jump), speed/agility (4×10 m shuttle run), and cardiorespiratory fitness (20 m shuttle run). The adolescents reported their relatives' physical activity engagement and encouragement. Analysis of covariance showed that relatives' physical activity engagement (father, mother, brother, and best friend) was positively related to cardiorespiratory fitness (P?0.05); and mother's and sisters' physical activity engagement were positively associated with higher muscular strength in adolescents (P?0.05). Furthermore, father's physical activity encouragement was positively linked to physical fitness (all fitness components) in adolescents (P?0.05). Interventions aimed at improving physical fitness in young people might be more successful when family members, particularly mothers and fathers, are encouraged to engage in physical activity and support adolescents' physical activity. 相似文献
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Helena Byrne 《Sport in History》2019,39(2):166-186
ABSTRACTIt is a common fact that women's sport and leisure history, especially in male dominated spheres, and more specifically football, have been ignored by many academics. However, in recent years there have been major developments in digital technology that have changed the nature of the type of research that can be done. Access to tools to facilitate field research are relatively cheap and with the high volume of digitisation projects that have taken place over the last few years as well as the increasing number of born digital resources that have been published, there are new opportunities. In relation to women's soccer in Ireland, this paper asks the question – where are we now? The argument will review the current literature on this subject and outline potential approaches for future research. 相似文献
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Evdokimova Olga L. Alves Carla S. Krsmanović Whiffen Radenka M. Ortega Zaida Tomás Helena Rodrigues João 《Journal of Zhejiang University. Science. B》2021,22(6):450-461
In this study, the fibers of invasive species Agave americana L. and Ricinus communis L. were successfully used for the first time as new sources to produce cytocompatible and highly crystalline cellulose nanofibers. Cellulose nanofibers were obtained by two methods, based on either alkaline or acid hydrolysis. The morphology, chemical composition, and crystallinity of the obtained materials were characterized by scanning electron microscopy(SEM) together with energy-dispersive X-ray spectroscopy(EDX), dynamic light scattering(DLS), X-ray diffraction(XRD), and Fourier transform infrared(FTIR)spectroscopy. The crystallinity indexes(CIs) of the cellulose nanofibers extracted from A. americana and R. communis were very high(94.1% and 92.7%, respectively). Biological studies evaluating the cytotoxic effects of the prepared cellulose nanofibers on human embryonic kidney 293 T(HEK293 T) cells were also performed. The nanofibers obtained using the two different extraction methods were all shown to be cytocompatible in the concentration range assayed(i.e., 0-500 μg/mL). Our results showed that the nanocellulose extracted from A. americana and R. communis fibers has high potential as a new renewable green source of highly crystalline cellulose-based cytocompatible nanomaterials for biomedical applications. 相似文献