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891.
The aim of the study was to investigate the role of regulation and processing strategies in understanding science text. A total of 91 student teachers answered open-ended questions concerning photosynthesis before and after reading either a traditional or a refutational science text. After this, they also answered parts of the Inventory of Learning Styles. Understanding of photosynthesis increased after the text reading among all the students. However, deep and independent learners reached a better understanding than reproductive and support-dependent students. The refutational text seemed to promote understanding more than the traditional text. The study supports the assumption that personal characteristics play a role in learning complex scientific concepts. Further, refutational texts seem to facilitate high quality learning.  相似文献   
892.
In the globalized neoliberal economy, business schools and business science has become a dominant societal institution and discourse. However, this has not directly strengthened the position of business schools in the societal networks of power. This paper examines this paradox by depicting who are the actors in the field and how these actors seek to influence what passes as legitimate knowledge in the discipline of business studies. Informed by actor network theory (Latour in Reassembling the social: an introduction to actor-network theory. Oxford University Press, Oxford, 2005) and drawing on the antenarrative analysis (Boje in Narrative methods for organizational and communication research. Sage Publications, London, 2001), the paper considers the understated dynamics of negotiation over the form and content of academic knowledge in a local context (cf. Alferoff and Knights in Br J Manag 20(1):125–142, 2009). The paper depicts the change that has occurred from the early 1990s till today. First, the potentially influential actors will be identified. Second, two maps of networks in different points of time will be traced. In the contemporary network, the gatekeeper role of business schools is undermined by new prominent actors. The paper shows how business schools, instead of gaining a high power position, are now more dependent on a variety of other actors, who increasingly define what passes as relevant and valid knowledge in business studies.  相似文献   
893.
In 2004 the Finnish National Board of Education launched a new curriculum framework that includes principles, instructional aims, and a brief list of content by subject areas. The intent of this framework is that teachers should interpret the core curriculum at the local level and apply it in their own schools and classrooms. This approach encourages teachers to use their professional knowledge and take into account their students and the learning environment in applying and implementing the curriculum. This case study sought to understand how this core curriculum has been implemented by way of observations of language and literacy lessons in 8 grade 1 and grade 2 classrooms during a 2‐month period. The observations and the analysis were guided by earlier research conducted in classroom identified as ‘excellent’ in the US. The resulting data, in turn, were compared with the core curriculum. The findings show that, although some of the principles and the content of the core curriculum were reflected in practice, there were inconsistencies between the instructional methods used in the classrooms and the principles set in the core curriculum. Although some areas of the core curriculum were well represented in classroom language and literacy practices, others were covered only in part or not at all during the observation period.  相似文献   
894.
The sailing regatta for the Olympic games of 1980 was organized at the Pirita Sailing Centre in Tallinn. It is generally assumed that emigrant Estonians opposed the event. By December 1979, attempts to boycott the Moscow Olympics had faded. However, the Soviet invasion of Afghanistan again opened the question. Eventually a large number of Western countries stayed home and many others did not participate in the sailing regatta. The situation was discussed again in the Estonian emigrant press but the focus of the general discussion was on Afghanistan and the Baltic question remained in its shadow. Besides writing memorandums to state officials and the International Olympic Committee, Estonian emigrants organized public demonstrations and sports festivals to support their cause. Although general interest in the Baltic question increased due to the Olympic sailing contests, the interest diminished soon after the games.  相似文献   
895.
Electromyographic (EMG) activity of the leg muscles and the ground reaction forces were recorded in 17 elite male middle-distance runners, who performed isometric maximal voluntary contractions (MVC) as well as running at different speeds. Electromyograms were recorded from the gluteus maximus, vastus lateralis, biceps femoris, gastrocnemius and tibialis anterior. The results indicated that the averaged EMG (aEMG) activities of all the muscles studied increased (P?<?0.05) with increasing running speed, especially in the pre-contact and braking phases. At higher speeds, the aEMG activities of the gastrocnemius, vastus lateralis, biceps femoris and gluteus maximus exceeded 100% MVC in these same phases. These results suggest that maximal voluntary contractions cannot be used as an indicator of the full activation potential of human skeletal muscle. Furthermore, the present results suggest that increased pre-contact EMG potentiates the functional role of stretch reflexes, which subsequently increases tendomuscular stiffness and enhances force production in the braking and/or propulsive phases in running. Furthermore, a more powerful force production in the optimal direction for increasing running speed effectively requires increased EMG activity of the two-joint muscles (biceps femoris, rectus femoris and gastrocnemius) during the entire running cycle.  相似文献   
896.
Abstract

To develop a track version of the maximal anaerobic running test, 10 sprint runners and 12 distance runners performed the test on a treadmill and on a track. The treadmill test consisted of incremental 20-s runs with a 100-s recovery between the runs. On the track, 20-s runs were replaced by 150-m runs. To determine the blood lactate versus running velocity curve, fingertip blood samples were taken for analysis of blood lactate concentration at rest and after each run. For both the treadmill and track protocols, maximal running velocity (v max), the velocities associated with blood lactate concentrations of 10 mmol · l?1 ( v 10 mM) and 5 mmol · l?1 ( v 5 mM), and the peak blood lactate concentration were determined. The results of both protocols were compared with the seasonal best 400-m runs for the sprint runners and seasonal best 1000-m time-trials for the distance runners. Maximal running velocity was significantly higher on the track (7.57 ± 0.79 m · s?1) than on the treadmill (7.13 ± 0.75 m · s?1), and sprint runners had significantly higher v max, v 10 mM, and peak blood lactate concentration than distance runners (P<0.05). The Pearson product – moment correlation coefficients between the variables for the track and treadmill protocols were 0.96 (v max), 0.82 (v 10 mM), 0.70 (v 5 mM), and 0.78 (peak blood lactate concentration) (P<0.05). In sprint runners, the velocity of the seasonal best 400-m run correlated positively with v max in the treadmill (r = 0.90, P<0.001) and track protocols (r = 0.92, P<0.001). In distance runners, a positive correlation was observed between the velocity of the 1000-m time-trial and v max in the treadmill (r = 0.70, P<0.01) and track protocols (r = 0.63, P<0.05). It is apparent that the results from the track protocol are related to, and in agreement with, the results of the treadmill protocol. In conclusion, the track version of the maximal anaerobic running test is a valid means of measuring different determinants of sprint running performance.  相似文献   
897.
Abstract

The purpose of this study was to assess the effects of heavy resistance, explosive resistance, and muscle endurance training on neuromuscular, endurance, and high-intensity running performance in recreational endurance runners. Twenty-seven male runners were divided into one of three groups: heavy resistance, explosive resistance or muscle endurance training. After 6 weeks of preparatory training, the groups underwent an 8-week resistance training programme as a supplement to endurance training. Before and after the 8-week training period, maximal strength (one-repetition maximum), electromyographic activity of the leg extensors, countermovement jump height, maximal speed in the maximal anaerobic running test, maximal endurance performance, maximal oxygen uptake ([Vdot]O2max), and running economy were assessed. Maximal strength improved in the heavy (P = 0.034, effect size ES = 0.38) and explosive resistance training groups (P = 0.003, ES = 0.67) with increases in leg muscle activation (heavy: P = 0.032, ES = 0.38; explosive: P = 0.002, ES = 0.77). Only the heavy resistance training group improved maximal running speed in the maximal anaerobic running test (P = 0.012, ES = 0.52) and jump height (P = 0.006, ES = 0.59). Maximal endurance running performance was improved in all groups (heavy: P = 0.005, ES = 0.56; explosive: P = 0.034, ES = 0.39; muscle endurance: P = 0.001, ES = 0.94), with small though not statistically significant improvements in [Vdot]O2max (heavy: ES = 0.08; explosive: ES = 0.29; muscle endurance: ES = 0.65) and running economy (ES in all groups < 0.08). All three modes of strength training used concurrently with endurance training were effective in improving treadmill running endurance performance. However, both heavy and explosive strength training were beneficial in improving neuromuscular characteristics, and heavy resistance training in particular contributed to improvements in high-intensity running characteristics. Thus, endurance runners should include heavy resistance training in their training programmes to enhance endurance performance, such as improving sprinting ability at the end of a race.  相似文献   
898.
The purpose of the current study was to determine metabolic thresholds and subsequent activity intensity cutoff points for the ActiGraph GT1M with various epochs spanning from 5 to 60 sec in young children. Twenty-two children, aged 4 to 9 years, performed 10 different activities including locomotion and play activities. Energy expenditure was measured with indirect calorimetry. Thresholds and cutoff points were determined through receiver operating characteristic curves. The lower metabolic threshold was 6.19 kcal·kg?1·h?1 for moderate and 9.28 kcal·kg?1·h?1 for vigorous intensity. The cutoff points for the GT1M accelerometer appear to be lower than those for the previous model (7164). For 5-sec epochs, a cutoff point of 143 counts resulted for moderate intensity and of 208 counts for vigorous intensity activity. Whether short or long epochs were chosen when collecting data to determine cutoff points, does not appear to have an influence on the resulting cutoff values. Similarly, comparable results are seen when analyses are based on locomotion only as opposed to a wide range of activities including children's play.  相似文献   
899.
Objective: To explore through an interdisciplinary approach the potential to tailor health information on the basis of human information behaviour (HIB) on par with the results of basic physiological measurements of individuals’ health. Methods: The data were collected at the baseline of a physical activity and diabetes prevention intervention with 72 prediabetic participants, conducted in Oulu, Finland, by the University of Oulu and Oulu Deaconess Institute in 2010. Body mass index (BMI), fitness classifications and glucose values were obtained from all prediabetic participants. The interest in, the search for and the use of information on nutrition, physical activity and diabetes were examined through a self‐report questionnaire with a response rate of 95.8%. The data were analysed with the SPSS statistics 18 software. Results and conclusions: The study shows that information behaviour of prediabetic individuals differs according to their BMI and fitness level. Poor physical fitness classifications and high BMI values were associated with an increased desire to receive tailored information on nutrition and physical activity frequently. These results add knowledge on the types and preferred frequencies of tailored information. Because of the small sample size, the results should be validated further.  相似文献   
900.
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