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排序方式: 共有261条查询结果,搜索用时 15 毫秒
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Esther Ubago-Guisado Alba Gómez-Cabello Javier Sánchez-Sánchez Jorge García-Unanue Leonor Gallardo 《Journal of sports sciences》2015,33(16):1710-1718
The aim of this study was to analyse whether there are differences in bone mass in girls playing different sports. Two hundred girls (10.6 ± 1.5 years old, Tanner stages I–III) participated in the study and were divided into groups of 40 (swimmers, soccer players, basketball players, handball players and controls). Bone mineral content and bone mineral density (BMD) (whole body and hip) were measured using dual-energy X-ray absorptiometry. The degree of sexual development was determined using Tanner test, and physical activity habits were recorded through a questionnaire designed ad hoc for this research. Girls were divided by pubertal stage and the type of sport. In the prepubertal group, intertrochanteric BMD was significantly higher in both handball and soccer players compared with the control group (P < 0.05). Furthermore, in the pubertal group, total BMD, mean arms BMD, pelvis BMD, femoral neck BMD, intertrochanteric BMD and Ward’s triangle BMD were significantly higher in soccer and handball players compared with the control group (P < 0.05), and the swimmers showed significantly higher values in the mean arms BMD compared with the control group (P < 0.01). Our data suggest that sport practice during puberty, especially in activities that support the body weight, may be an important factor in achieving a high peak bone mass and improving bone health in girls. 相似文献
63.
Hernán Cofré Claudia Vergara Norman G. Lederman Judith S. Lederman David Santibáñez Javier Jiménez Macarena Yancovic 《Journal of Science Teacher Education》2014,25(7):759-783
Understanding nature of science (NOS) is considered critical to the development of students’ scientific literacy. However, various studies have shown that a large number of elementary and secondary science teachers do not possess an adequate understanding of NOS. This study investigated how elementary teachers’ understanding of NOS was impacted through a 1-year professional development program in Chile that included NOS instruction as a theme throughout two types of mini-courses in the program. Twelve teachers attended a 1-year development program focused on improving teacher content knowledge and included the instruction of NOS embedded in two self-contained NOS mini-courses (36 h) and two lessons (3 h each) within five science content mini-courses (30 h). The Views of NOS (version D+) questionnaire and interviews were used to assess teachers’ understanding of NOS at the beginning (January) and end of the program (December). Elementary teachers’ understanding of the creative, inferential, and tentative aspect of NOS showed improvement. According to the teachers’ perceptions, the most significant activities for improving their NOS understanding were decontextualized activities in both types of mini-courses (self-contained NOS and science content mini-courses). The implications for professional development programs are also discussed. 相似文献
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Javier Corredor Matthew Gaydos Kurt Squire 《Journal of Science Education and Technology》2014,23(3):324-343
This article explores how learning biological concepts can be facilitated by playing a video game that depicts interactions and processes at the subcellular level. Particularly, this article reviews the effects of a real-time strategy game that requires players to control the behavior of a virus and interact with cell structures in a way that resembles the actual behavior of biological agents. The evaluation of the video game presented here aims at showing that video games have representational advantages that facilitate the construction of dynamic mental models. Ultimately, the article shows that when video game’s characteristics come in contact with expert knowledge during game design, the game becomes an excellent medium for supporting the learning of disciplinary content related to dynamic processes. In particular, results show that students who participated in a game-based intervention aimed at teaching biology described a higher number of temporal-dependent interactions as measured by the coding of verbal protocols and drawings than students who used texts and diagrams to learn the same topic. 相似文献
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This paper aims at identifying the factors influencing the implementation of Web accessibility (WA) by European banks. We studied a database made up of 49 European banks whose shares are included in the Dow Jones EURO STOXX® TMI Banks [8300] Index. Regarding the factors for the implementation, we considered three feasible reasons. Firstly, WA adoption can be motivated by operational factors, as WA can aid in increasing operational efficiency. Secondly, we expect large banks to have higher WA levels, as small firms face competitive disadvantages with regard to technology adoption. Lastly, WA can also be understood as a part of the Corporate Social Responsibility (CSR) strategy, so, the more committed a bank is to CSR, the more prone it will be to implement WA. Our results indicate that neither the operational factors nor the firm size seem to have exerted a significant influence on WA adoption. Regarding CSR commitment, results indicate a significant influence on WA adoption. However, the effect of the influence is contrary to that hypothesized, since more CSR-committed banks have less accessible Web sites. A possible reason for this result is that banks not included in the CSR indexes try to overcome this drawback by engaging in alternative CSR activities such as WA. 相似文献
66.
Gutierrez-Davila M Rojas FJ Ortega M Campos J Parraga J 《Journal of sports sciences》2011,29(12):1321-1328
This study seeks to discover whether handball goalkeepers employ a general anticipatory strategy when facing long distance throws and the effect of uncertainty on these strategies. Seven goalkeepers and four throwers took part. We used a force platform to analyse the goalkeeper's movements on the basis of reaction forces and two video cameras synchronised at 500 Hz to film the throw using 3D video techniques. The goalkeepers initiated their movement towards the side of the throw 193 ± 67 ms before the release of the ball and when the uncertainty was reduced the time increased to 349 ± 71 ms. The kinematics analysis of their centre of mass indicated that there was an anticipatory strategy of movement with certain modifications when there was greater uncertainty. All the average scores referring to velocity and lateral movement of the goalkeeper's centre of mass are significantly greater than those recorded for the experimental situation with bigger uncertainty. The methodology used has enabled us to tackle the study of anticipation from an analysis of the movement used by goalkeepers to save the ball. 相似文献
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El enfoque didáctico basado en tareas, que se presenta en los trabajos de Breen y de Candlin en este mismo número, cuenta en este artículo con un desarrollo detallado, que permitirá al lector aplicarlo al diseño de unidades didácticas concretas para la enseñanza de una L2, con una especificación de los pasos y de los niveles a seguir y con una guía para integrar estos diseños en el marco del modelo curricular adoptado en nuestro país desde la nueva Ley de Ordenación General del Sistema Educativo. 相似文献
69.
Disruptive behavior can waste a great deal of teaching time in the classroom, leading to feelings of frustration in teachers and an increase in academic failure among pupils. Prior research indicates that intervening in these kinds of behaviors improves the classroom atmosphere and facilitates the learning process. With this in mind, the aims of this article are to (a) reduce the incidence of disruptive behaviors such as standing up without the teacher's permission, shouting, fighting, and interrupting the teacher or a fellow classmate, using a combination of the Good Behavior Game (GBG) and Say‐Do‐Report (S‐D‐R) Correspondence training; (b) achieve long‐term maintenance of results following the gradual withdrawal of the intervention; and (c) introduce the GBG in a different educational context than those discussed so far in the empirical literature. The intervention took place with the 15 children of a standard primary classroom (Cycle 1) at a state‐run school in Andalusia (Spain). Using a multiple baseline design across situations, the GBG and Say not‐not Do‐Request not (Sn‐nD‐Rn) Correspondence training were introduced. A significant reduction in the incidence of disruptive behavior was observed, contingent on the respective application of the intervention in each baseline. The combined application of the GBG and the S‐D‐R Correspondence proved to be an effective way of decreasing disruptive behaviors (shouting, interrupting, etc.) in the classroom, and the results were maintained for 1 year following the gradual withdrawal of the treatment. © 2010 Wiley Periodicals, Inc. 相似文献
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