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1.
European Journal of Psychology of Education - The purpose of this research was to investigate the impact of students’ prior attitude on the processing of conflicting information regarding a...  相似文献   
2.
Two experiments used eye tracking to investigate a novel cueing approach for directing learner attention to low salience, high relevance aspects of a complex animation. In the first experiment, comprehension of a piano mechanism animation containing spreading-colour cues was compared with comprehension obtained with arrow cues or no cues. Eye tracking data revealed differences in learner attention patterns between the different experimental conditions. The second experiment used eye tracking with synchronized and non-synchronized cues to investigate the role of dynamic direction of attention in cueing effectiveness. Results of Experiment 1 showed that spreading-colour cues resulted in better targeting of attention to thematically relevant aspects and in higher comprehension scores than arrow cues or no cues. For Experiment 2, superior comprehension after the synchronized version together with eye tracking data indicated that cue effectiveness depended on attention direction being spatially and temporally coordinated with onsets of animation events having high thematic relevance to the learning task. The findings suggest the importance of perceptual cues and bottom-up processing.  相似文献   
3.
The time course of learners’ processing of a complex animation was studied using a dynamic diagram of a piano mechanism. Over successive repetitions of the material, two forms of cueing (standard colour cueing and anti-cueing) were administered either before or during the animated segment of the presentation. An uncued group and two other control conditions were also employed. Development of an internal representation of the movements depicted in the animation was evaluated through participant demonstrations of the mechanism’s operation on a replica piano mechanism. Eye tracking (fixation lengths) indicated that overall, conventional visuospatially-based cueing was largely ineffective for directing attention across the presentations of the animation. Demonstration scores from cued animations were no better than those produced from the uncued version. Cue obedience for standard colour cueing was initially superior to that for anti-cues but fell away after the animation’s first exposure. Contrary to expectations, there was no difference in cue obedience for cueing applied before or during animation of the display. The findings suggest that alternatives to visuospatial cues are needed to help learners process complex animations more effectively.  相似文献   
4.
This is a translation of the paper “Recommendations for the application and follow-up of quality controls in medical biology laboratories” published in French in the journal Annales de Biologie Clinique (Recommandations pour la mise en place et le suivi des contrôles de qualité dans les laboratoires de biologie médicale. Ann Biol Clin (Paris). 2019;77:577-97.). The recommendations proposed in this document are the result of work conducted jointly by the Network of Accredited Medical Laboratories (LABAC), the French Society of Medical Biology (SFBC) and the Federation of Associations for External Quality Assessment (FAEEQ). The different steps of the implementation of quality controls, based on a risk analysis, are described. The changes of reagent or internal quality control (IQC) materials batches, the action to be taken in case of non-conform IQC results, the choice of external quality assessment (EQA) scheme and interpretation of their results as well as the new issue of analyses performed on several automatic systems available in the same laboratory are discussed. Finally, the concept of measurement uncertainty, the robustness of the methods as well as the specificities of near-patient testing and rapid tests are described. These recommendations cannot apply for all cases we can find in medical laboratories. The implementation of an objective alternative strategy, supported with documented evidence, might be equally considered.  相似文献   
5.
The article presents an economic analysis of Libre software and of its sustainability as a new economic model for software. We underline the role of Libre software development communities and analyze incentives for both kernel and obscure developers. We emphasize the role of the so-called ‘public’ licenses to provide an appropriate institutional framework. We show that several features of Libre software also allow it to improve faster than proprietary software, and therefore to achieve strong market performance when competing against existing standards, even when proprietary software producers react. We illustrate our point using a simple local and global interaction model to study the technological competition between Linux and Windows on the server operating system (OS) market. We finally argue that if sufficient initial momentum could be created through public intervention Libre software could turn from a fad into an efficient economic institution to correct inefficiencies due to network externalities.  相似文献   
6.
In this article, we study the conditions and constraints of the integration of the dynamic geometry software ‘Cabri’ in the teaching of geometry in ordinary primary school classes (10 years old pupils). We focus our attention on the way the dialectic between old and new is working during this integration, looking at the types of tasks and techniques proposed in class by the teachers. The ‘good equilibrium’ between old and new ways of doing appears as one of the main conditions of integration as it allows to reconcile innovating and usual activities in the everyday life of the class. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
7.
An expository text is presented, in which two types of importance signals are manipulated: a linguistic signal (a sentence calling attention on the following target-sentence’s contents); a paralinguistic signal (underlining a part of the target-sentence). Reading times (RT) allocated to the various text sentences were measured. The underline affects not only RT for the target-sentence itself (increased in case of underline), but also RT for the preceding linguistic signal (shortened when the targetsentence is underlined), and RT for the following sentence (shortened when the two types of signals are simultaneously present). The interpretation of these results is grounded on the importance signals’ function in activating some high level representations (here bounded to a specific rhetorical structure: analogy), the effects of which can be delayed on the following sentence’s integration. The necessity is argued to take over the connection between relevant representations, marks likely to activate these representations, and devices likely to call reader’s attention on these marks.  相似文献   
8.
A broad range of microfluidic applications, ranging from cell culture to protein crystallization, requires multilevel devices with different heights and feature sizes (from micrometers to millimeters). While state-of-the-art direct-writing techniques have been developed for creating complex three-dimensional shapes, replication molding from a multilevel template is still the preferred method for fast prototyping of microfluidic devices in the laboratory. Here, we report on a "dry and wet hybrid" technique to fabricate multilevel replication molds by combining SU-8 lithography with a dry film resist (Ordyl). We show that the two lithography protocols are chemically compatible with each other. Finally, we demonstrate the hybrid technique in two different microfluidic applications: (1) a neuron culture device with compartmentalization of different elements of a neuron and (2) a two-phase (gas-liquid) global micromixer for fast mixing of a small amount of a viscous liquid into a larger volume of a less viscous liquid.  相似文献   
9.
Abstract

Flow around a rowing blade is a very complex phenomenon, involving unsteady three-dimensional flow with violent motion of the free surface. However, in the literature, forces acting on blades are modelled using extreme and dubious simplifications. The aim of the present study was to evaluate the influence of free surface and unsteadiness (two physical characteristics that are commonly neglected when modelling loads on blades) as well as viscous effects. In fact, quasi-static approaches are often used, with no influence of the free surface effects. To conduct this study, computational fluid dynamics is used, supported by experimental results performed with a dedicated device reproducing a simplified rowing stroke in the towing tank. Comparisons show that both free surface flow and unsteadiness must be considered to capture the whole physics of the phenomenon accurately. In contrast, the viscous effects have a very limited influence.  相似文献   
10.

Objectives

Adolescents often experience different types of victimization across a specified period of time in different situations. These multiple victimization experiences can have a number of deleterious effects on psychosocial well-being. To expand on research gathered primarily from US samples, the current study estimated the prevalence of multiple victimization in a nationally representative sample of Canadian adolescents. We also expanded on past research by adopting an ecological approach to identify correlates of multiple victimization.

Methods

Cross-sectional data from the 2000-2001 cycle of the National Longitudinal Survey of Children and Youth (NLSCY) were used to estimate the prevalence of multiple victimization (verbal harassment, threat of and actual physical assault, school social exclusion, discrimination) in 1,036 13-16 year olds. We also examined household (e.g., parental education), family (e.g., parenting practices), and adolescent (e.g., friendship quality) correlates of multiple victimization for the whole sample and separately by sex.

Results

Among the 6 in 10 adolescents who reported at least 1 victimization experience, 30.5% reported 2 types of victimization whereas 23.7% reported 3 or more types. There was an increased probability of multiple victimization (2 or more types) in adolescents who reported greater parental rejection, who engaged in more frequent out-of-school activities, and who experienced non-victimization adversity. The probability decreased if adolescents reported greater friendship quality.

Conclusions

The clustering of different types of victimization is common among adolescents. For both males and females, a difficult parent-child relationship characterized as rejecting is important when considering risk for multiple victimization, as is the adolescent's functioning outside of the home in the context of friendship quality and involvement in out-of-school activities. Non-victimization adversity (e.g., death of a loved one) also emerged as a significant multiple victimization correlate.

Practice implications

Non-physically invasive types of victimization (although adolescents also endorsed physical assault) are a reality for a number of adolescents. As such, we need to inquire about such experiences as school social exclusion, discrimination, and verbal threats in applied contexts. Moreover, in order to better identify adolescents who may be vulnerable to multiple forms of victimization, we need to adopt an ecological approach that considers individual, family, and household functioning.  相似文献   
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