Defining and Operationalizing Appropriation for Science Learning     

Olivia Levrini  Paola Fantini  Giulia Tasquier  Barbara Pecori  Mariana Levin 《学习科学杂志》2015,24(1):93-136

The goal of this article is to contribute to understanding the interplay between students' disciplinary engagement and their identity construction. The term appropriation, borrowed from scholars in linguistics and education, was chosen to capture this broader sense of productive learning that sits at the nexus of disciplinary engagement and identity. Appropriation implies deep conceptual understanding, but it also involves a reflexive process of transforming scientific discourse in a way that is authentic and personal. The core aim of this article is to turn the term appropriation into a theoretical construct by means of an analytic process of defining, operationalizing, and testing the definition against student interview and classroom data. Five discourse markers for operationalizing appropriation were discovered through this process. Appropriation, in our study, implies students’ discourse is (A) an expression of a personal “signature“ idea, (B) grounded in the discipline, (C) thick, in that it involves a metacognitive and epistemological dimension, (D) non-incidental, in the sense of being consistently used throughout classroom activities, and (E) a carrier of social relationships, in that it positions the student within classroom. The study is grounded in an extended intervention on thermodynamics in an Italian secondary school class (grade 12).  相似文献   

The Impact of a Study Abroad Experience on Preservice Teachers' Dispositions and Plans for Teaching English Language Learners     

Paola Pilonieta  Adriana L. Medina  Jennifer I. Hathaway 《The Teacher Educator》2017,52(1):22-38

This study explored how a study abroad experience affected preservice teachers' (PSTs') dispositions towards and plans for teaching English Language Learners (ELLs). This qualitative study involved 16 elementary education initial licensure PSTs who participated in a 2-month study abroad trip to Germany. Data in the form of surveys, interviews, and reflections were collected. The PSTs' experiences left them feeling like outsiders, fostering greater empathy for ELLs. As the PSTs faced the challenges of studying abroad, they developed ways of coping, which influenced their dispositions toward ELLs and the accommodations they wanted to make when teaching ELLs in their future classrooms. A model of the PSTs' learning progression within the study abroad experience is offered as a lens to consider their transformations. Findings suggest it would be beneficial for educators traveling abroad with PSTs to find ways to make explicit the connections between personal encounters and future teaching experiences.  相似文献   

“I am [not always] a maths hater”: Shifting students’ identity narratives in context     

Annica Andersson  Paola Valero  Tamsin Meaney 《Educational Studies in Mathematics》2015,90(2):143-161

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Municipal consultants’ participation in building networks to support science teachers’ work     

Martin Krabbe Sillasen  Paola Valero 《Cultural Studies of Science Education》2013,8(3):595-618

This paper focuses particularly on the role of municipal science consultants in developing and maintaining network activities and connections among primary school science teachers. The hypothesis is that consultants play a crucial role in supporting strategic planning, and sustaining contacts and activities within professional learning networks. The research is framed by a project that involved 80 primary science teachers in 20 schools. The aim of the project was to develop network activities that facilitate sustainable change of the participating schools’ collective culture and practice of science teaching. The authors were involved as researchers and evaluators in the project. Data consist of reports from the consultants about their participation in various network activities, school assessment reports and a longitudinal survey. Three distinct cases are analysed through the use of a framework of professional learning networks to assess the consultants’ opportunities and constraints in terms of participating in network development. The results indicate that the consultants’ roles in successful network formation is characterized by personal stable contacts within the science teacher community in the municipality, availability of municipal resources to support network activities, participation in strategic planning of municipal network support, and facilitation of the development of new teaching activities within schools or in collaboration between schools. These four distinctive features of municipal science consultants’ participation in supporting network activities enable the participants to share and develop teaching activities.  相似文献   

Evaluation of sample hemolysis in blood collected by S-Monovette? using vacuum or aspiration mode     

Giuseppe Lippi  Paola Avanzini  Roberta Musa  Franca Sandei  Rosalia Aloe  Gianfranco Cervellin 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2013,23(1):64-69

Background:

In vitro hemolysis can be induced by several biological and technical sources, and may be worsened by forced aspiration of blood in vacuum tubes. This study was aimed to compare the probability of hemolysis by drawing blood with a commercial evacuated blood collection tube, and S-Monovette used either in the “vacuum” or “aspiration” mode.

Materials and methods:

The study population consisted in 20 healthy volunteers. A sample was drawn into 4.0 mL BD Vacutainer serum tube from a vein of one upper arm. Two other samples were drawn with a second venipuncture from a vein of the opposite arm, into 4.0 mL S-Monovette serum tubes, by both vacuum an aspiration modes. After separation, serum potassium, lactate dehydrogenase (LD) and hemolysis index (HI) were tested on Beckman Coulter DxC.

Results:

In no case the HI exceed the limit of significant hemolysis. As compared with BD Vacutainer, no significant differences were observed for potassium and LD using S-Monovette with vacuum method. Significant increased values of both parameters were however found in serum collected into BD Vacutainer and S-Monovette by vacuum mode, compared to serum drawn by S-Monovette in aspiration mode. The mean potassium bias was 2.2% versus BD Vacutainer and 2.4% versus S-Monovette in vacuum mode, that of LD was 2.7% versus BD Vacutainer and 2.1% versus S-Monovette in vacuum mode. None of these variations exceeded the allowable total error.

Conclusions:

Although no significant macro-hemolysis was observed with any collection system, the less chance of producing micro-hemolysis by S-Monovette in aspiration mode suggest that this device may be used when a difficult venipuncture combined with the vacuum may increase the probability of spurious hemolysis.  相似文献   

Informatics curricula and teaching methods     

Paola Forcheri 《British journal of educational technology : journal of the Council for Educational Technology》2004,35(4):506-506

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BOOK REVIEW     

Paola Sztajn 《Journal of Mathematics Teacher Education》2006,9(4):401-410

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The logic of practice in the practice of logics: practicing journalism and its relationship with business in times of technological changes     

Elena Raviola  Paola Dubini 《Journal of Cultural Economy》2016,9(2):197-213

This paper investigates the workings of institutional logics in practice, by focusing in particular on the interplay between material, practical and linguistic dimensions of practices. In other words, drawing on Bourdieu's sens pratique, the paper explores the logic of practice in the practice of logics through a six months full-time ethnographic study at Il Sole-24 Ore, the largest Italian financial newspaper, between 2007 and 2008. An original conceptual framework is developed to analyse how the logic of journalism is enacted vis-à-vis that of advertising in a setting in which an old technology for news production – print newspaper – coexists with a new one – website – and thus encounters between new and old technological possibilities make workings of institutional logics particularly visible. The findings point out different mechanisms of institutional work dealing with actions that, made possible by new technological possibilities, are potentially, but not necessarily classified as divergent from institutional logics.  相似文献   

Cross-linguistic analysis of vocabulary in young children: spanish, dutch, French, hebrew, italian, korean, and american english   总被引：2，自引：0，他引：2  

Bornstein MH  Cote LR  Maital S  Painter K  Park SY  Pascual L  Pêcheux MG  Ruel J  Venuti P  Vyt A 《Child development》2004,75(4):1115-1139

The composition of young children's vocabularies in 7 contrasting linguistic communities was investigated. Mothers of 269 twenty-month-olds in Argentina, Belgium, France, Israel, Italy, the Republic of Korea, and the United States completed comparable vocabulary checklists for their children. In each language and vocabulary size grouping (except for children just learning to talk), children's vocabularies contained relatively greater proportions of nouns than other word classes. Each word class was consistently positively correlated with every other class in each language and for children with smaller and larger vocabularies. Noun prevalence in the vocabularies of young children and the merits of several theories that may account for this pattern are discussed.  相似文献   

Retrospective cytological evaluation of indeterminate thyroid nodules according to the British Thyroid Association 2014 classification and comparison of clinical evaluation and outcomes     

Massimo Giusti  Barbara Massa  Margherita Balestra  Paola Calamaro  Stefano Gay  Simone Schiaffino  Giovanni Turtulici  Simonetta Zupo  Eleonora Monti  Gianluca Ansaldo 《Journal of Zhejiang University. Science. B》2017,18(7):555-566

The cytology of 130 indeterminate nodules (Thy 3) was retrospectively reviewed according to the British Thyroid Association 2014 classification. Nodules were divided into Thy 3a (atypical features) and Thy 3f (follicular lesion) categories. Histology was available as a reference for 97 nodules. Pre-surgical evaluations comprised biochemical tests, color-Doppler ultrasonography (US), semi-quantitative elastography-US (USE), contrast-enhanced US (CEUS), and mutation analysis from cytological slides. Thyroid malignancy was the final diagnosis for 19% of surgically-treated nodules. No statistically significant difference in the risk of malignancy was found between Thy 3a (26%) and Thy 3f (14%) nodules. Histology of the Thy 3a and Thy 3f nodules showed a higher incidence of Hurtle cell adenomas in Thy 3f (29%) than in Thy 3a (3%) nodules (P=0.01). The only pre-surgical difference concerned the BRAF V600E mutation, which was positive in some Thy 3a but not in any Thy 3f nodules (P=0.04). Receiver-operating characteristic (ROC) analysis was used to obtain cut-off values from US (score), USE (ELX 2/1 strain index), and CEUS (time-topeak index and peak index) data. The cut-off values were similar for Thy 3a and Thy 3f nodules. Data showed that malignancy can be suspected if the US score is >2, ELX 1/2 strain index >1, time-to-peak index >1, and peak index <1. In a sub-group of 24 revised nodules (12 Thy 3a and 12 Thy 3f) with histology as a reference, the diagnostic power of cumulative pre-surgical analysis by means of US, USE, and CEUS showed high positive and negative predictive values (83% and 100%, respectively) for the presence of malignancy in Thy 3a and Thy 3f nodules. In conclusion, in our series of revised Thy 3 nodules, malignancy was low and displayed no significant differences between Thy 3a and Thy 3f categories. The use of cut-offs based on histology as a reference could reduce surgery. Our data support the conviction that, in mutation-negative Thy 3a and Thy 3f nodules, observation should be the first choice when not all instrumental results are suspect.  相似文献