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261.
ABSTRACT

National senior service programs have had a long and relatively successful history. Emerging at the intersection of federal aging and poverty policy initiatives in the early 1960s, projects such as the Foster Grandparent Program (FGP) and the Senior Companion Program (SCP) have expanded in size and scope over the last several decades. These two programs were first introduced into northwestern North Carolina in the 1980s. While the experiences of FGP and SCP in the region have broadly mirrored the successes of programs located elsewhere, they have also confronted difficulties unique to their local realities that federal policy guidelines are often not sensitive to.  相似文献   
262.
ABSTRACT

Physical and virtual experimentation are thought to have different affordances for supporting students’ learning. Research investigating the use of physical and virtual experiments to support students’ learning has identified a variety of, sometimes conflicting, outcomes. Unanswered questions remain about how physical and virtual experiments may impact students’ learning and for which contexts and content areas they may be most effective. Using a quasi-experimental design, we examined eighth grade students’ (N?=?100) learning of physics concepts related to pulleys depending on the sequence of physical and virtual labs they engaged in. Five classes of students were assigned to either the: physical first condition (PF) (n?=?55), where students performed a physical pulley experiment and then performed the same experiment virtually, or virtual first condition (VF) (n?=?45), with the opposite sequence. Repeated measures ANOVA’s were conducted to examine how physical and virtual labs impacted students’ learning of specific physics concepts. While we did not find clear-cut support that one sequence was better, we did find evidence that participating in virtual experiments may be more beneficial for learning certain physics concepts, such as work and mechanical advantage. Our findings support the idea that if time or physical materials are limited, using virtual experiments may help students understand work and mechanical advantage.  相似文献   
263.
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265.
Abstract

We examined relationships between skinfold (SKF) and optical density (ΔOD) measurements across age and levels of body fatness (%BF) for 151 women, 20 to 72 years. There were significant (p < .05) relationships between ΔODs and SKFs at all sites, except the thigh. The interaction (SKF × Age) was significant (p < .05) for pectoral and biceps ΔODs. Slope comparisons indicated the relationships for younger (29 years) and older (59 years) women differed significantly from zero and each other (p < .05). Analysis of SKF × %BF interactions revealed that relationships between SKFs and ΔODs at the pectoral and biceps sites for leaner (22% BF) women differed significantly from zero (p < .05) and were larger than those for obese (39% BF) women (p ≤ .05). Thus, the relationship between SKFs and ΔODs is stronger for younger and leaner women compared to older and fatter women. These findings may reflect differences in fat layering due to age or body fatness and provide insight as to why the manufacturer's near-infrared (NIR) equation significantly underestimates the %BF of obese women.  相似文献   
266.
This is a retrospective analysis of the performance of a large training program in a combat environment looked at through the lens of human performance technology. Van Tiem, Moseley, and Dessinger's performance improvement/HPT model and strategic, operational, and tactical levels are used to describe effective and ineffective applications of human performance technology in a complex, multinational operation. While some interventions or projects at the training center showed marked improvements in targeted areas, there were numerous opportunities to do even better work, and the ultimate analysis of the effectiveness of the training center remains to be determined.  相似文献   
267.
bidirectional delta file is a novel concept, introduced in this paper, for a two way delta file. Previous work focuses on single way differential compression called forwards and backwards delta files. Here we suggest to efficiently combine them into a single file so that the combined file is smaller than the combination of the two individual ones. Given the bidirectional delta file of two files S and T and the original file S, one can decode it in order to produce T. The same bidirectional delta file is used together with the file T in order to reconstruct S. This paper presents two main strategies for producing an efficient bidirectional delta file in terms of the memory storage it requires; a quadratic time, optimal, dynamic programming algorithm, and a linear time, greedy algorithm. Although the dynamic programming algorithm often produces better results than the greedy algorithm, it is impractical for large files, and it is only used for theoretical comparisons. Experiments between the implemented algorithms and the traditional way of using both forwards and backwards delta files are presented, comparing their processing time and their compression performance. These experiments show memory storage savings of about 25% using this bidirectional delta approach as compared to the compressed delta file constructed using the traditional way, while preserving approximately the same processing time for decoding.  相似文献   
268.
ABSTRACT

This reflective article examines the relationship between teachers’ engagement in action research and their ability to lead within their schools. As part of The New Educator’s special issue, “Developing an Inquiry Stance toward Instructional Improvement: Teacher-Leader Action Research,” this article demonstrates the development of an inquiry stance. It shares the story of two practicing teacher leaders within the new and challenging circumstance of adjusting to, and studying, the professional development they provided to help teachers deal with a challenging transition to a radically different school space. This article examines the ways practitioner inquiry supported these teachers to be leaders in the new architectural space designed to promote innovative instruction for twenty-first-century teaching and learning. We posit that coupling teacher leadership and teacher research enables teachers (a) to lead with literature, (b) to lead from data, (c) to lead through sharing, and (d) to lead by example.  相似文献   
269.
ABSTRACT

In times of widening participation, Australian universities trade on notions of diversity, framing themselves as hospitable places of access and inclusion. In this space, Academic Language and Learning (ALL) practitioners may be seen as extending the welcome of the university through practices aimed at addressing students’ diverse needs. These include identifying students ‘at-risk’ of failure and attrition, conducting one-to-one appointments, and embedding academic literacies by team-teaching within disciplines. In this paper, we reflect on these practices through the lens of Derrida’s notion of hospitality, drawing on key themes such as the constitutive power relationships of hospitality, the aporia between conditional and unconditional hospitality, and hospitality as an ethics of difference and openness to the ‘arrival of the new’. For each of the explored practices, we problematise the institutionalised framing of ALL practitioners as hosts in benevolent universities providing an unreserved welcome to the student ‘foreigner’. We examine the practice of identifying students-at-risk and question a conditional hospitality that risks closing the door on the unforeseeable that students may bring. Our reflection on the managerially devalued one-to-one appointments highlights hospitality as ethics, with each appointment presenting a crisis of choice in responsibly welcoming student difference. Team-teaching exposes the ambiguity of the ALL practitioner ‘being at-home’ in embedded contexts while presenting the possibility for disrupting established roles and practices. Engaging with Derrida’s hospitality thus allows us to uncover power dynamics shaping the role of ALL practitioners and offers the possibility of ethical responsiveness to student difference and a radical opening to the new.  相似文献   
270.
Abstract

The flipped classroom model of teaching can be an ideal venue for turning a traditional classroom into an engaging, inquiry-based learning (IBL) environment. In this paper, we discuss how two instructors at different universities made their classrooms come to life by moving the acquisition of basic course concepts outside the classroom and using class time for active problem-based learning. Results from student surveys are presented to relate student perceptions of the flipped/IBL classroom model.  相似文献   
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