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181.
Along with other cultural organizations, newspapers, through waves of digital disruption, have become subject to a dominant narrative of crisis. But newspapers have long participated in change. A constructivist approach, qualified by consideration of media materiality, draws attention to diverse but essential processes of innovation around them. We see a contraflow of migration from digital to print, opening up a shared media space; bonding strategies are bringing multimedia to ink on paper, while bridging via boundary objects such as QR (Quick Response) codes are connecting the two. Among other initiatives, development of automation of news production and experiments with transparency are further evidence of an active embrace of change by newspapers that calls into question the discourse on their demise. This analysis inductively develops a nuanced account of the role of the newspaper as an object and as an institution. It suggests a hybrid, multifaceted, enduring presence of print in the complex media ecology of the future. 相似文献
182.
郭俊克 《天津大学学报(英文版)》2009,15(2):79-94
Bridge pressure flow scour at clear water threshold condition is studied theoretically and experimentally. The flume experiments reveal that the measured scour profiles under a bridge are more or less 2-dimensional; all the measured scour profiles can be described by two similarity equations, where the horizontal distance is scaled by the deck width while the local scour by the maximum scour depth; the maximum scour position is located just under the bridge about 15% deck width from the downstream deck edge; the scour begins at about one deck width upstream the bridge while the deposition occurs at about 2.5 deck widths downstream the bridge; and the maximum scour depth decreases with increas-ing sediment size, but increases with deck inundation. The theoretical analysis shows that: bridge scour can be divided into three cases, i.e. downstream unsubmerged, partially submerged, and totally submerged. For downstream unsubmerged flows, the maximum bridge scour depth is an open-channel problem where the conventional methods in terms of critical velocity or bed shear stress can be applied; for partially and totally submerged flows, the equilibrium maximum scour depth can be described by a scour and an inundation similarity number, which has been confirmed by experiments with two decks and two sediment sizes. For application, a design and field evaluation procedure with examples is presented, including the maximum scour depth and scour profile. 相似文献
183.
Kevin J. Swick 《Early Childhood Education Journal》2009,37(3):183-187
Homeless parents of young children face many stressors that erode their self-esteem. This article articulates these stressors
and how they negatively impact homeless parents and their children. Strategies for helping parents empower themselves and
their children are explained. 相似文献
184.
Laura L. Brock Sara E. Rimm-Kaufman Lori Nathanson Kevin J. Grimm 《Early childhood research quarterly》2009,24(3):337-349
Executive functioning (EF) refers to higher order thought processes considered foundational for problem-solving. EF has both ‘cool’ cognitive and ‘hot’ emotional components. This study asks: (a) what are the relative contributions of ‘hot’ and ‘cool’ EF to children's academic achievement? (b) What are the relative contributions of ‘hot’ and ‘cool’ EF to learning-related classroom behaviors and observed engagement? (c) Do learning-related classroom behaviors and observed engagement account for the relation between EF and achievement? For a sample of 173 kindergarteners, cool EF predicted math achievement, learning-related classroom behaviors, and observed engagement. Hot EF did not predict any achievement or behavior outcomes when examined concurrently with cool EF. Children's classroom behavior did not account for the relation between cool EF and math achievement, suggesting cool EF and math performance are directly associated. 相似文献
185.
Xuezhao Lan Claire Cameron Ponitz Kevin F. Miller Su Li Kai Cortina Michelle Perry Ge Fang 《Early childhood research quarterly》2009,24(2):198-211
This study investigated variation in students’ behavioral engagement across mathematics classes in China and the United States. Student behavioral engagement was examined along with two aspects of the classroom (group size and teacher instructions given about classroom behavior). Video observational data were collected and coded over 1051 time intervals in 35-minute mathematics sessions in Chinese classrooms (n = 8) and comparable American classrooms (n = 7). Latent growth analyses revealed that overall, behavioral engagement declined over time, although the drop-off was dramatically sharper in American classrooms relative to Chinese classrooms. In addition, larger group size and the timing of teacher instructions (given before versus after the behavior) were significantly associated with increased engagement. This study revealed compelling cultural differences as well as patterns in student and teacher behaviors associated with students engaging in on-task behaviors in the classroom. Implications for ways to promote effective classroom behavior are discussed. 相似文献
186.
This paper discusses the fundamentals of Differential Scanning Calorimetry (DSC) including functions and outputs of a Differential
Scanning Calorimeter along with common uses in academia and industry. 相似文献
187.
Problem-based learning and the development of metacognition 总被引:1,自引:0,他引:1
Kevin Downing Theresa Kwong Sui-Wah Chan Tsz-Fung Lam Woo-Kyung Downing 《Higher Education》2009,57(5):609-621
This study samples first year undergraduates from two programmes at a Hong Kong University (N = 66). One programme uses an entirely problem-based approach to learning and teaching, whilst the other uses more traditional
methods. Using the Learning and Study Strategies Inventory (LASSI) as a measure of student perceptions of their thinking,
or metacognition it explores differences in metacognitive development between each group of students between the beginning
and end of their first year in each programme. The paper argues that, in addition to the formal learning context, everyday
challenges emerging from the additional new social contexts provided by problem-based curricula provide fertile environments
for the development of metacognition because whilst the highest ‘meta-level’ of cognition is usually not implicated when we
receive an outside task and when the task solution is known, the meta-level does tend to be consulted when things go wrong
or when the situation is new. In other words, when we are faced with finding solutions to a problem whether posed by the teacher
as part of a problem-based curriculum or a new social environment, we are more likely to develop generic, as well as subject
specific skills. 相似文献
188.
189.
A recent evaluation of the new North Carolina Virtual Public School (NCVPS) in the USA revealed numerous expectations for virtual school teachers from secondary students. Specifically, students expected their teachers to actually teach rather than moderate a course shell, supplement course shells with content and projects that illustrate relevance, provide for both content and peer interaction, and respond to questions and provide feedback quickly. The data suggest a possible content‐related interaction where a limited course shell can be bolstered by a proactive teacher, but potentially flounder among teachers who do not expect or know how to supplement an online course. Data further suggest a potential communication‐related interaction where increased opportunities for student–student and student–teacher interaction could potentially decrease the actual or perceived need for individualized attention that is particularly challenging for virtual teachers to provide. These results can be used to establish teacher expectations and design professional development experiences that prepare teachers to undertake divergent roles unique to online instruction. 相似文献
190.
Over the past several decades, one of the most significant changes in the delivery of postsecondary education involves the
dramatic increase in the use of contingent or part-time faculty. Although the increased use of part-time faculty within higher
education makes sense from an administrative point of view, its use does not come without criticism. With community colleges
representing a more convenient, affordable, and flexible educational option for a number of students, particularly those from
disadvantaged backgrounds, examining how exposure to part-time faculty relates to students’ academic goals represents an important
area of inquiry. This study draws from social and human capital frameworks and uses hierarchical generalized linear modeling
(HGLM) to examine how exposure to part-time faculty relates to community college students’ likelihood of transferring to a
four-year college or university. Findings suggest that students tend to be significantly less likely to transfer as their
exposure to part-time faculty increases. 相似文献