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171.
Kristin Walker Pickering 《Technical Communication Quarterly》2013,22(2):166-187
“The study of activity ceases to be the psychology of an individual, but instead focuses on the interaction between an individual, systems of artifacts, and other individuals in historically developing institutional settings” (Miettinen, 1997).
As teaching technical writing online becomes more widespread, teachers and scholars are identifying ways to increase teaching/learning efficacy. One way of accomplishing this goal is by continually reflecting on different types of student ethos being constructed in an online course. The changes that occur in the ethos development process can be contextualized through activity theory, which emphasizes the dynamic, evolving nature of social environments. Activity theory's focus on cultural history and tools makes it ideal for exploring active communication among multiple participants in an online technical communication environment. The triangle of human activity adapted and developed by Engeström (1987) provides a framework for exploring ethos as an object within an online course's activity system. 相似文献
172.
This article reports the findings from a mixed-methods study on factors that influence women’s decisions about birth, with the view that women’s decision making about birth can affect the use of cesarean surgery. Data was collected from focus groups and structured postpartum interviews and was analyzed using the Consensual Qualitative Research method. The findings relate specifically to the factors reported as influential in making decisions about birth including how the women categorized, prioritized, and/or favored certain types of knowledge about modes of birth. Four major information categories were identified but only stories about birth and/or attending a birth appeared to have a lasting effect on birth choices. These findings have implications for prenatal and perinatal education and nursing practice. 相似文献
173.
Fatigue represents a reduction in the capability of muscle to generate force. The aim of the present study was to establish the effects of exercise that simulates the work rate of competitive soccer players on the strength of the knee extensors and knee flexors. Thirteen amateur soccer players (age 23.3±3.9 years, height 1.78±0.05?m, body mass 74.8±3.6?kg; mean±s) were tested during the 2000–2001 soccer season. Muscle strength of the quadriceps and hamstrings was measured on an isokinetic dynamometer. A 90?min soccer-specific intermittent exercise protocol, incorporating a 15?min half-time intermission, was developed to provide fatiguing exercise corresponding in work rate to a game of soccer. The exercise protocol, performed on a programmable motorized treadmill, consisted of the different intensities observed during soccer match-play (e.g. walking, jogging, running, sprinting). Muscle strength was assessed before exercise, at half-time and immediately after exercise. A repeated-measures analysis of variance showed significant reductions (P?<0.001) in peak torque for both the quadriceps and hamstrings at all angular velocities (concentric: 1.05, 2.09, 5.23 rad?·?s?1; eccentric: 2.09 rad?·?s?1). The peak torque of the knee extensors (KE) and knee flexors (KF) was greater before exercise [KE: 232±37, 182±34, 129±27, 219±41?N?·?m at 1.05, 2.09 and 5.23 rad?·?s?1 (concentric) and 2.09 rad?·?s?1 (eccentric), respectively; KF: 126±20, 112±19, 101±16, 137±23?N?·?m] than at half-time (KE: 209±45, 177±35, 125±36, 214±43?N?·?m; KF: 114±31, 102±20, 92±15, 125±25?N?·?m) and greater at half-time than after exercise (KE: 196±43, 167±35, 118±24, 204±43?N?·?m; KF: 104±25, 95±21, 87±13, 114±27?N?·?m). For the hamstrings?:?quadriceps ratio, significant changes were found (P?<0.05) for both legs, the ratio being greater before than after exercise. For fast?:?slow speed and left?:?right ratios, no significant changes were found. We conclude that there is a progressive reduction in muscle strength that applies across a range of functional characteristics during exercise that mimics the work rate in soccer. 相似文献
174.
Abstract The aims of this study were to investigate the energy build-up and dissipation mechanisms associated with using an arm swing in submaximal and maximal vertical jumping and to establish the energy benefit of this arm swing. Twenty adult males were asked to perform a series of submaximal and maximal vertical jumps while using an arm swing. Force, motion and electromyographic data were recorded during each performance and used to compute a range of kinematic and kinetic variables, including ankle, knee, hip, shoulder and elbow joint powers and work done. It was found that the energy benefit of using an arm swing appears to be closely related to the maximum kinetic energy of the arms during their downswing, and increases as jump height increases. As jump height increases, energy in the arms is built up by a greater range of motion at the shoulder and greater effort of the shoulder and elbow muscles but, as jump height approaches maximum, these sources are supplemented by energy supplied by the trunk due to its earlier extension in the movement. The kinetic energy developed by the arms is used to increase their potential energy at take-off but also to store and return energy from the lower limbs and to “pull” on the rest of the body. These latter two mechanisms become more important as jump height increases with the pull being the more important of the two. We conclude that an arm swing contributes to jump performance in submaximal as well as maximal jumping but the energy generation and dissipation sources change as performance approaches maximum. 相似文献
175.
Five- to 10-year-olds (N = 90) listened to 6 illustrated scenarios featuring 2 characters that jointly experience the same positive event (and feel good), negative event (and feel bad), or ambiguous event (and feel okay). Afterward, one character thinks a positive thought and the other thinks a negative thought. Children predicted and explained each character's emotions. Results showed significant development between 5 and 10 years in children's understanding that thinking positively improves emotions and thinking negatively makes one feel worse, with earliest knowledge demonstrated when reasoning about ambiguous and positive events. Individual differences in child and parental optimism and hope predicted children's knowledge about thought-emotion connections on some measures, including their beliefs about the emotional benefits of thinking positively in negative situations. 相似文献
176.
Kristin Rosekrans Arieh Sherris Marie Chatry-Komarek 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2012,58(5):593-618
In 1957 Ghana was the first sub-Saharan colonial nation-state to achieve independence from British rule. The language of literacy instruction, however, remained English throughout most of Ghana’s independence, effectively thwarting reading and writing in 11 major and 67 minor indigenous languages in use today. After years of policy shifts, including the intermittent of mother tongue in early childhood schooling to facilitate English language and literacy instruction, prospects for a bold move towards multilingual education have emerged from a coalescence of forces inside and outside of Ghanaian education policy circles. This article discusses how the inertia of a dated language policy and a historic disregard for Ghana’s multilingual landscape by the country’s own policy makers are being overcome, at least partially, by progressive powers of change, albeit not without challenge. It undertakes an analysis of how a policy environment that supports bilingual education was created in order to implement a comprehensive and innovative multilingual programme, the National Literacy Acceleration Program (NALAP), which was rolled out across the nation’s schools in early 2010. Having been involved in the process of designing NALAP, the authors describe the development of standards of learning and materials, as well as innovative aspects of a constructivist teacher education approach. The paper concludes with recommendations for further research, including combining a change process for key stakeholders and randomised language and literacy assessment with social marketing research in a unified approach. 相似文献
177.
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179.
The last several years have seen a dramatic increase in interest surrounding the role of clinical experiences in enhancing the learning of teacher candidates. Further, pressure has intensified to demonstrate the impact of teacher candidates on P–12 learners. With these goals in mind, a model alternative school/university partnership was created, based on Korthagen's “Realistic Teacher Education” framework. This article is an evaluation of the impact of this intervention on student outcomes from the program's first three years. A convergence of evidence reveals significant improvements in grade point average and credits earned; furthermore, significant improvements in total disciplinary incidents emerged in some of the analyses. These results suggest that this teacher education intervention has promise for documenting impact on P–12 learners. This outcome is significant for accreditation purposes, for bolstering the image of teacher education programs within the broader community, and for establishing a common research agenda. 相似文献
180.
The Individuals with Disabilities Education Act (2004) has had substantial influence on special education in general and the field of learning disabilities in particular. Since its reauthorization in 2004, ongoing regulatory efforts have been underway to determine its operationalization and implementation. Of particular concern to those involved in the educational process (i.e., special educators, school psychologists, families, advocates) are the guidelines for identifying children with specific learning disabilities (SLD), including the use of Response to Intervention (RTI). In this article, some of the most relevant and controversial issues associated with the use of RTI for the identification of SLD are detailed. We discuss how SLD is conceptualized in terms of identification approaches and classification criteria and present position statements of special education professional associations on the changes to the federal SLD definition and identification criteria. Finally, we summarize proposed resolutions to the seemingly irreconcilable differences identified throughout the article. 相似文献