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71.
72.
Based on a coding of 39 videotaped three-lesson units on the introduction to the Pythagorean Theorem, three teaching patterns were identified: lecturing, developing based on a problem, and discovery based on a problem. The analysis showed no effect of the teaching patterns on student achievement, whereas effects were discovered on students' perceived learning quality. The discovery teaching pattern had negative effects on the emotional quality of learning. However, this pattern exhibited high degree of externally rated cognitive activation. The lecturing approach to the introduction to the Pythagorean Theorem supported students' self-perceived understanding.  相似文献   
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74.
Scapular dyskinesis is recognized as an abnormality in the kinetic chain; yet, there has been little research quantifying scapular motion during sport tasks. Tennis forehand drives of eight highly skilled tennis players were studied to assess the scapulothoracic kinematics and evaluate repeatability using video-based motion analysis. Scapulothoracic downward/upward rotation, posterior/anterior tilt, and internal/external rotation were computed using an acromial marker cluster. On average, the upward rotation, anterior tilt, and internal rotation varied from 1° to 26°, from 7° to 32°, and from 42° to 100°, respectively, during the tennis forehand drive. During the backswing and forward swing phases of the forehand stroke, small changes were observed for the three scapular angle values, while all angles increased rapidly during the follow-through phase. This suggests that the tennis forehand drive may contribute to scapula dyskinesis, mainly due to the great amplitude in scapulothoracic anterior tilt and internal rotation observed during the follow-through phase. Knowledge of normal scapula motion during sport tasks performed at high velocity could improve the understanding of various sport-specific adaptations and pathologies.  相似文献   
75.
Resumen

Con el objeto de tener un mayor conocimiento del funcionamiento de las formas verbales en castellano, este trabajo aporta datos empíricos relativos a la manera cómo se representan las características del proceso (Aktionsart) descritas por el verbo. Tres son los factores estudiados: la duratividad, la resultatividad y la iteratividad o continuidad del proceso. Utilizando una metodología de representación gráfica se han recogido datos de una población de 42 adultos y 72 niños distribuidos en 4 grupos correspondientes a los cursos 2°, 4°, 6° y 8°

Los resultados obtenidos con los nueve verbos estudiados demuestran, por un lado, la validez del método ya que hace aparecer una neta dicotomía que opone los procesos resultativos no durativos a los no resultativos durativos, y por otro, que la duratividad y la resultatividad del proceso son captados de manera muy semejante por los adultos y por los niños de 4°, 6.° y 8.°, si bien los de 2.° denotan un menor acuerdo interindividual. Por último, el factor duratividad o iteratividad no constituye en esta prueba una dimensión discriminante.  相似文献   
76.
Many studies have stressed students’ lack of understanding of experiments in laboratories. Some researchers suggest that if students design all or parts of entire experiment, as part of an inquiry-based approach, it would overcome certain difficulties. It requires that a procedure be written for experimental design. The aim of this paper is to describe the characteristics of a procedure in science laboratories, in an educational context. As a starting point, this paper proposes a model in the form of a hierarchical task diagram that gives the general structure of any procedure. This model allows both the analysis of existing procedures and the design of a new inquiry-based approach. The obtained characteristics are further organized into criteria that can help both teachers and students assess a procedure during and after its writing. These results are obtained through two different sets of data. First, the characteristics of procedures are established by analysing laboratory manuals. This allows the organization and type of information in procedures to be defined. This analysis reveals that students are seldom asked to write a full procedure, but sometimes have to specify tasks within a procedure. Secondly, iterative interviews are undertaken with teachers. This leads to the list of criteria to evaluate the procedure.  相似文献   
77.
The authors of the current chemistry curriculum—implemented in Grade 12 in France—provided a criterion of change allowing prediction of direction of chemical changes and pointed out the difference to be made between experimental facts and models. A study analysing part of the curriculum content and the effects of teaching this content on students’ reasoning was conducted. The content analysis presents the functioning of the thermodynamic model, which highlights the links to be made between the experimental situation and the model when predicting the direction of a chemical change. This functioning specifies the role of the chemical equation and that of the criterion of change (comparing the reaction quotient to the equilibrium constant) and stresses the crucial points that may lead to misunderstandings. Written tests were administered to students after teaching them to determine how they predicted the direction of a chemical change, and whether they made a relevant choice between using the chemical equation and using the criterion of change and a clear distinction between the experimental situation and the thermodynamic model. Few students had a good understanding of the respective roles of the criterion and the chemical equation. A majority used the criterion to predict the direction of chemical changes relevantly, but correct answers were not widespread. Two particular mistakes, the modification of the expression of the reaction quotient and the prediction of a change despite a missing reactant, revealed that students do not properly understand the difference and the relationship between the experimental situation and the thermodynamic model.  相似文献   
78.
In most Western societies, males are stereotyped as having stronger mathematical abilities than females whereas females are stereotyped as having stronger verbal abilities than males. Exposure to negative ability stereotypes reliably undermines performance in laboratory experiments, yet the mechanisms by which such stereotypes may influence boys’ and girls’ achievement outcomes in the more naturalistic setting of primary and secondary school remain unclear. The current study evaluated a hypothesis suggested by expectancy-value theories (e.g., Eccles & Wigfield, 2002): the relationship between stereotypes and achievement outcomes is importantly mediated by a student’s perceived competence and his or her valuation of the domain in question. We tested the hypothesis by examining the career intentions and grades of 762 sixth and eighth graders. As expected, even after controlling for prior achievement, stereotype endorsement primarily predicted grades and career intentions indirectly, through students’ competence beliefs and task values. These results suggest that stereotypes predict achievement-related outcomes most clearly when students internalize them.  相似文献   
79.
The purpose of this paper focuses on mothers’ beliefs about their child’s personality and development (stability or change and causal attributions) and how these beliefs can be affected by mothers’ experience (being a mother of a six or of a twelve-year-old child and being a mother of a normally-developing or of a mentally disabled child). The scales were completed by several samples of mothers. The effect of the temporal orientation (retrospective or perspective) was also considered. The results show that the mothers rate their child with an optimistic bias while the mothers of disabled children are less positive than those of the broad-ranging sample. The results are also in accordance with the decrease of positiveness as the child grows. Finally, the optimistic bias differs in function of the temporal orientation for the mothers of normally-developing children and for the mothers of mentally disabled children. The retrospective change is also overestimated with regard to the prospective one in the broad-ranging sample.  相似文献   
80.
Research on media success factors is a fragmented field. Definitions, measures, and methods vary, and findings are often inconsistent. In an attempt to fill this perceived research gap, we distilled generic success factors of media products from the literature. Guided by theory and empirical findings, these factors were aggregated to complex concepts, building blocks of success that we further investigated in an exploratory qualitative study. We found that the building blocks are applicable to all types of media, independent of seriality and content types of media products. Subsequently the research question of this article is: Which building blocks of success are most important for media products? To answer this question, we conducted an online survey of 255 media professionals in print, audio-visual, and online media in Austria, Germany and Switzerland. To analyze our data, we deployed qualitative comparative analysis, a method based on set theory that is suitable to investigate complex causality. We conclude that four building blocks are necessary for success: “good” distribution, environmental orientation, form/design, and human resources are preconditions for achieving success in terms of audience market share. In addition, three patterns emerge in the sufficient paths (combinations of building blocks) to success. Which route to success a media product shows can be related to the width of its topical scope and the corresponding projected audience size.  相似文献   
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