Identifying the Item Hierarchy and Charting the Progression across Grade Levels: Surveying Taiwanese Students’ Understanding of Scientific Models and Modeling     

Silvia Wen-Yu Lee 《International Journal of Science and Mathematics Education》2018,16(8):1409-1430

The purpose of this study was, first, to understand the item hierarchy regarding students’ understanding of scientific models and modeling (USM). Secondly, this study investigated Taiwanese students’ USM progression from 7th to 12th grade, and after participating in a model-based curriculum. The questionnaire items were developed based on 6 aspects of USM, namely, model type, model content, constructed nature of models, multiple models, change of models, and purpose of models. Moreover, 10 representations of models were included for surveying what a model is. Results show that the purpose of models and model type items covered a wide range of item difficulties. At the one end, items for the purpose of models are most likely to be endorsed by the students, except for the item “models are used to predict.” At the other end, the “model type” items tended to be difficult. The students were least likely to agree that models can be text, mathematical, or dynamic. The items of the constructed nature of models were consistently located above the average, while the change of models items were consistently located around the mean level of difficulty. In terms of the natural progression of USM, the results show significant differences between 7th grade and all grades above 10th, and between 8th grade and 12th grade. The students in the 7th grade intervention group performed better than the students in the 7th and 8th grades who received no special instruction on models.  相似文献   

A kinematic comparison between long-line and cross-court top spin forehand in competitive table tennis players     

Ivan Malagoli Lanzoni  Sandro Bartolomei  Rocco Di Michele  Silvia Fantozzi 《Journal of sports sciences》2018,36(23):2637-2643

ABSTRACT

The aim of the present study was to compare the biomechanical characteristics of the table tennis top spin shot when played cross-court (CC) or long-line (LL) in competitive table tennis players. Seven national level players respectively completed 10 long-line and 10 cross-court top spin shots responding to a standard ball machine. A stereophotogrammetric system was used to track body segments while executing the motion. Significantly more flexed right knee and elbow angles were measured at the moment of maximum velocity of the racket (MMV) in LL. In addition, significantly greater angles between the feet and the table and between the shoulders and the table at the MMV, indicated more pronounced rotation angles of the lower upper and upper-body in LL compared to CC with respect to the table. A higher inclination of the racket at the MMV was found in LL. The elbow flexion and the racket inclination may be associated to the direction of the shot. The present findings show that kinematic differences exist between the LL and the CC topspin forehand in competitive table tennis players. Coaches should be aware of these differences to adopt the optimal teaching strategies and to reproduce proper joint angles during training.  相似文献   

Learning at the boundaries in an “Open Regional Innovation System”: A focus on firms’ innovation strategies in the Emilia Romagna life science industry     

Fiorenza Belussi  Alessia Sammarra  Silvia Rita Sedita 《Research Policy》2010,39(6):710-721

The paper investigates the existence of an Open Regional Innovation System (ORIS model). This model is characterised by the firms’ adoption of an open innovation strategy, which overcomes not only the boundaries of the firms but also the boundaries of the region.Using data collected in a sample of life science firms, our research provides the evidence that the Emilia Romagna RIS has evolved towards an ORIS model, where firms’ innovation search strategy, despite being still embedded in local nets (involving several regional public research organisations - PROs), is open to external-to-the-region research networks and knowledge sources. It also shows that innovation openness influences significantly the firms’ innovative performance.  相似文献   

The impact of exercise training on the lipid peroxidation metabolomic profile and respiratory infection risk in older adults     

Diana Silva  Eduardo Arend  Silvia M. Rocha  Alisa Rudnitskaya  Luís Delgado  André Moreira 《European Journal of Sport Science》2019,19(3):384-393

Aging is associated with oxidative stress that may increase susceptibility to respiratory infections (RIs). We aimed to assess the impact of exercise training on the risk of RIs in older adults and on a targeted metabolomic profile of stress oxidative lipid peroxidation-related metabolites. Methods: In an 8-month clinical trial, 38 participants over 60 years of age were allocated to an exercise group (EG), in which participants underwent 90-min training sessions three times/week(n?=?20), or a control group (CG), in which participants maintained daily physical activities(n?=?18). Daily respiratory symptoms and RIs number and severity were collected. Serum by-products were assessed by comprehensive two-dimensional gas chromatography coupled to mass spectrometry with time of flight analyzer. Serum metabolomic profiling comprised 76 metabolites (alcohols, aldehydes, alkanes, and ketones). Principal components analysis and ANOVA-simultaneous component analysis were used to evaluate the metabolomic profile change. Results: The odds ratio of RIs for the EG was 2.0 CI 95% [0.2;25]. The incidence of RIs was 47% [23;70] in the EG vs. 44%[12;77] in the CG. The metabolomic profiling showed that alkanes and aldehydes classes differed between the EG and the CG before and after intervention. A calibration model showed a relation between the metabolites from four main classes (ketones, alcohols, alkanes and aldehydes) and the prediction of the number of RIs. Conclusion: Moderate exercise training, in older adults, compared with no exercise in controls, did not show a difference in the risk of RIs. A pattern of lipid peroxidation was associated with the number of RIs.  相似文献   

Multiple creative talents and their determinants at the local level     

Silvia Cerisola 《Journal of Cultural Economics》2018,42(2):243-269

Creativity is currently at the centre of a lively scientific debate in which scholars from different fields are engaged. The interest on such topic is mainly due to its potential positive impact on economic development; thus, understanding the determinants of creativity becomes important in terms of policy decisions. Although the existing literature has identified some determinants of creativity, evidence on the specific impact of such determinants on particular creative talents and on the degree of creative complexity within a local area is still scant. This work tries to fill this gap starting from the thought that the mental cross-fertilization of talents in different fields is what stimulates the best and most original ideas. By considering artistic, scientific, and economic creativities as the main modes in which creativity can show itself, the paper explores empirically the relation between local socio-economic characteristics and the concurrent presence of multiple creative talents.  相似文献   

The scientific approach to the restoration and monitoring of mural paintings at S. Girolamo Chapel – SS. Annunziata Church in Florence     

Sara Bianchin  Monica Favaro  Pietro Alessandro Vigato  Guido Botticelli  Gioia Germani  Silvia Botticelli 《Journal of Cultural Heritage》2009,10(3):379-387

The scientific approach to the restoration and monitoring of mural paintings, at S. Girolamo Chapel – SS. Annunziata Church in Florence, is reported as a fruitful example of the synergic collaboration between restorers and scientists in the planning and development of conservative interventions. Before restoration, the painting technique and the state of preservation of the pictorial cycle have been investigated firstly by close examination of the painted surfaces and then by optical and/or SEM-EDS microscopy and μFT-IR spectroscopy on appropriately selected samples. In particular, the original constituent materials and those belonging to subsequent restorations were characterized together with those originating from decay processes. In this mural painting cycle, a peculiar “fresco” technique has been used although an auxiliary binder for pigment distemper has been also employed. The use of this technique, sometimes in an improper way together with uncorrected restoration interventions, are the main responsible of the unsatisfactory state of conservation of many painted areas. Preliminary conservation trials and scientific studies were carried out to design the most convenient restoration intervention and to verify the correctness and non-invasive of the necessary operations. Special attention was devoted to cleaning procedures, continuously monitored by a physico-chemical methodology, mainly based on microinvasive, microscopic and spectroscopic investigations, to evaluate the efficiency, advantages and drawbacks of the proposed cleaning procedures and define the most appropriate ones. Finally, specific decay markers have been recognized, by a comparison of the results obtained from the detached samples with those deriving from artificially aged models, to be used for a correct future monitoring and maintenance of the wall paintings.  相似文献   

The mirror’s curse: Weight perceptions mediate the link between physical activity and life satisfaction among 727,865 teens in 44 countries     

Silvia Meyer  Rebekka Weidmann  Alexander Grob 《运动与健康科学(英文)》2021,10(1):48-54

Purpose:The present study aimed to examine the link between physical activity(PA)and life satisfaction in a large international study of adolescents.We also aimed to test whether overweight and underweight perceptions act as mediators and whether age and sex acted as moderators.Methods:For this purpose,we analyzed data from the Health Behavior in School-aged Children study,which comprises 727,865 observations from 44 nations at 4 measurement occasions.Results:Multilevel analyses revealed a positive link between PA and life satisfaction.In addition,underweight and overweight perceptions mediated the effect of PA on life satisfaction.We further found that age and sex acted as moderators.In older adolescents,stronger effects were found in the links between PA and life satisfaction,PA and overweight perception,and both weight perceptions and life satisfaction.In addition,in female adolescents,the link between overweight perception and life satisfaction was stronger.Conversely,the links between PA and both weight perceptions were stronger for boys.Conclusion:The results suggest that weight perception explains part of the relationship between PA and life satisfaction in adolescents and that these effects vary as a function of age and sex.  相似文献   

Overcoming feudal constraints on educational research in Spain: the impact of the CIMIE conference     

Adriana Aubert  Pilar Álvarez  Silvia Molina 《高等教育研究与发展》2019,38(3):450-464

ABSTRACT

Feudal structures and power relationships that Spanish universities inherited from Franco’s dictatorship have damaged the quality of educational research. However, the emergence of initiatives aimed to address these limitations have been identified. In this article, we analyze the impact of the Multidisciplinary International Conference on Educational Research (CIMIE). Specifically, we analyze how CIMIE is contributing to overcome some of the feudal constraints affecting educational research in Spain, such as fragmentation of areas of knowledge, limited international research efforts, and precarious and unstable employment situations of many researchers. Grounded in the communicative methodology of research and using mixed methods, we have conducted a longitudinal study of this research initiative (2012–2016), comprising interviews and communicative observations, analysis of documentation and quantitative data. The results show that participants understand that their involvement in CIMIE is contributing to make them feel released from the constraints of university feudalism by building solidarity networks and egalitarian relationships, and by rethinking research.  相似文献   

Intelligence and Creativity Are Pretty Similar After All     

Paul J. Silvia 《Educational Psychology Review》2015,27(4):599-606

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Instructor-provided summary infographics to support online learning     

Silvia Elena Gallagher  Mairtin O’Dulain  Niamh O’Mahony  Claire Kehoe  Fintan McCarthy  Gerard Morgan 《Educational Media International》2017,54(2):129-147

Infographics are a visualisation tool that can be used to improve retention, comprehension and appeal of complex concepts. The rise of infographic use in education has facilitated new forms of application and design of these tools. Instructor-provided summary infographics are a new form of infographic, whereby key learning objectives and content are summarised in graphical form at the end of a lesson. However, it is unknown whether these types of infographics can support learning in online environments. This exploratory research investigates student perceptions, retention, applications and activity generation of instructor-provided summary infographics in a massive online learning environment. Using both post-course learner survey data (n = 1,899) and text mining analysis (n = 72,490 words), results present how learners perceived instructor-provided summary infographics as useful and appealing for retaining, clarifying and understanding learning concepts. The research contributes a novel understanding of summary infographics in online learning environments, and supports their use as a design tool for educational delivery in the online space.  相似文献