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171.
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This article presents an overview of the recent literature on gendered patterns of academic choice in mathematics, science, and technology. It distinguishes in this literature micro-level, macro-level, and institutional explanations. Micro-level explanations focus primarily on psychological constructs, that is, variables at the level of the individual students. Macro-level explanations focus primarily on socioeconomic conditions and cultural understandings of gender roles. Institutional explanations focus on design characteristics of (national) education systems. After a presentation of these perspectives and of recent research progress that has been made, the authors critically discuss the lacunae that still exist in explaining cross-national variety, and provide suggestions for designing future research in this field.  相似文献   
174.
Forming a science-oriented identity is considered a process underlying both interest and achievement in science education. A questionnaire is developed for describing “identities as learners” and evaluating their science orientedness. The instrument (k = 65) focuses on cognitive aspects. An internal coherence of .88 was found. Five subscales were defined that proved interrelated yet distinguishable. A pilot amongst 40 students from Dutch general secondary education showed that preferring science over non-science subjects and relatively high grades for sciences subjects were strongly correlated to science orientedness of the learner identity (rs  = .65; p < .001). The results support the reliability and validity of the questionnaire but also point to the importance of identity as a central concept in studying science education. It is concluded that we made a promising step in constructing an instrument for monitoring the development of cognitive aspects of science-oriented identities during (innovative) science education.  相似文献   
175.
Abstract

The paper describes the results of an exploratory study of farmers’ reasons for changing or not changing to more sustainable production methods in arable farming in the Netherlands. The background of the research is the disappointing adoption of Integrated Arable Farming Systems (iafs). Perceived production risk was expected to be an important factor constraining adoption. This study suggests, however, that perceived risk is not a satisfactory explanation. One reason is that iafs as it has become in Dutch practice cannot be easily distinguished from conventional arable farming systems. A continuum of gradual adoption of iafs methods, mainly for economic reasons, was observed. A real watershed difference was observed between partial adopters of iafs and organic farmers who used no chemicals at all. Secondly, dealing with production risks, such as weather‐dependent problems with weeds, pests and diseases, is considered part of professionalism of both conventional and iafs farmers and hence not a reason for avoiding a specific crop husbandry technique. However, uncertainties emanating from market conditions and environmental policy were found to be important considerations. JAgr Educ Ext (2001, 7, 3, pp 153–166)  相似文献   
176.
In two experiments, we investigated emergent conditional relations in pigeons using a symbolic matching-to-sample task with temporal stimuli as the samples and hues as the comparisons. Both experiments comprised three phases. In Phase I, pigeons learned to choose a red keylight (R) but not a green keylight (G) after a 1-s signal. They also learned to choose G but not R after a 4-s signal. In Phase II, correct responding consisted of choosing a blue keylight (B) after a 4-s signal and a yellow keylight (Y) after a 16-s signal. Comparisons G and B were both related to the same 4-s sample, whereas comparisons R and Y had no common sample. In Phase III, R and G were presented as samples, and B and Y were presented as the comparisons. The choice of B was correct following G, and the choice of Y was correct following R. If a relation between comparisons that shared a common sample were to emerge, then responding to B given G would be more likely than responding to Y given R. The results were generally consistent with this prediction, suggesting, for the first time in pigeons, the emergence of novel relations that involve temporal stimuli as nodal samples.  相似文献   
177.
A partir de un análisis general de las relaciones entre los medios de comunicación y la escuela y del papel de los primeros en esta última, la autora presenta algunas alternativas y experiencias como el periódico electrónico o el teledebate. La aparición de nuevos y avanzados medios de comunicación en todo el mundo (como el periódico escolar electrónico), fruto de esta colaboración entre docentes y profesionales de la comunicación, ambos especialmente inquietos en sus profesiones, no sólo ayuda a cubrir el divorcio actualmente entre el contenido de la escuela y el contenido de la vida, sino que abre una de las más prometedoras y sugerentes vías de renovación, no sólo de la educación escolar, sino de la propia cultura de masas.  相似文献   
178.
Teaching is a significant social good and therefore teachers as well as the state have to take responsibility for guarding the moral quality of the teaching practice. Based on this premise, the article describes and defends the view that these parties have their own particular role by means of literature review and theoretical and practical arguments.

The role of the state is necessarily limited to defining minimal moral rules and obligations, because in liberal Western democracies morality is codified in law to a minimal degree. The state also has practical reasons for such a confined position, among which are the complexities of professional practice and its implied tacit knowledge.

Teachers have to take responsibility for constructing the full width of professional morality, but particularly for defining its optimal or aspirational dimension. This dimension comprises the virtues deemed important for teachers as well as their professional ideals. Whereas the literature on professional ethics of teachers is relatively silent about professional ideals, several arguments are provided for the importance of ideals for teachers.

The final part of the article defends the claim that teachers have to articulate their professional ideals through intra‐professional dialogue. Again, theoretical and practical arguments are provided, for instance that such a debate provokes teachers to think about the best aims and means of their profession and that it contributes to the sense and meaning of their work. The article ends with some practical implications of the theoretical exposé.  相似文献   
179.
We present a new method for analyzing a student's learning over time for a specific skill: analysis of the graph of the student's moment-by-moment learning over time. Moment-by-moment learning is calculated using a data-mined model that assesses the probability that a student learned a skill or concept at a specific time during learning (Baker, Goldstein, & Heffernan, 2010 Baker, R. S. J. d., Goldstein, A. B. and Heffernan, N. T. 2010. “Detecting the moment of learning”. In Proceedings of the 10th Annual Conference on Intelligent Tutoring Systems 2534. In V. Aleven, J. Kay, & J. Mostow (Eds.),pp.Heidelberg, Germany: Springer.[Crossref] [Google Scholar], 2011). Two coders labeled data from students who used an intelligent tutoring system for college genetics. They coded in terms of 7 forms that the moment-by-moment learning curve can take. These labels are correlated to test data on the robustness of students’ learning. We find that different visual forms are correlated with very different learning outcomes. This work suggests that analysis of moment-by-moment learning curves may be able to shed light on the implications of students’ different patterns of learning over time.  相似文献   
180.
Researchers often have expectations that can be expressed in the form of inequality constraints among the parameters of a structural equation model. It is currently not possible to test these so-called informative hypotheses in structural equation modeling software. We offer a solution to this problem using Mplus. The hypotheses are evaluated using plug-in p values with a calibrated alpha level. The method is introduced and its utility is illustrated by means of an example.  相似文献   
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