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Information Retrieval systems typically sort the result with respect to document retrieval status values (RSV). According to the Probability Ranking Principle, this ranking ensures optimum retrieval quality if the RSVs are monotonously increasing with the probabilities of relevance (as e.g. for probabilistic IR models). However, advanced applications like filtering or distributed retrieval require estimates of the actual probability of relevance. The relationship between the RSV of a document and its probability of relevance can be described by a normalisation function which maps the retrieval status value onto the probability of relevance (mapping functions). In this paper, we explore the use of linear and logistic mapping functions for different retrieval methods. In a series of upper-bound experiments, we compare the approximation quality of the different mapping functions. We also investigate the effect on the resulting retrieval quality in distributed retrieval (only merging, without resource selection). These experiments show that good estimates of the actual probability of relevance can be achieved, and that the logistic model outperforms the linear one. Retrieval quality for distributed retrieval is only slightly improved by using the logistic function. 相似文献
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Norbert Nikièma 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2011,38(2):599-616
This paper documents the new trend towards a first-language-first multilingual model in formal education in three former French
colonies of West Africa, namely Burkina Faso, Mali and Niger. It compares the sociolinguistic situations, the conditions of
the development of multilingual education and the achievements of mother-tongue-medium education in all three countries. The
evidence is that, contrary to common discourse in francophonie, a strong first-language-first model in formal education is the best guarantee of a good mastery of French and, more generally,
of quality education in francophone countries. 相似文献
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The present paper explores Flemish majority members’ expectations concerning the acculturation of Turkish minorities. We studied two kinds of antecedents: majority members’ perceptions of Turkish minorities’ acculturation behavior and their experiences of intergroup contact. The possible mediating role of outgroup affect was also investigated. 247 Flemish high school students completed a survey. Data were analyzed using path analyses. Results show that positive contact experiences and perceiving that Turkish immigrants make efforts to engage in contact with the host group and/or to adopt the host culture are associated with less negative affective reactions towards Turkish migrants. Perceiving that Turkish immigrants maintain their heritage culture is associated with more negative affective reactions. Our results further revealed that increased negative affective reactions are associated with less support for culture maintenance and for contact with the host group but with a higher demand for host culture adoption. The present results also show that expectations of contact engagement and expectations of host culture adoption cannot be considered as equivalent. This implies that results from studies using Berry's conceptualization of acculturation expectations (Berry, 2001) and results from studies using Bourhis’ conceptualization of acculturation expectations (Bourhis, Moïse, Perreault, & Senécal, 1997) are not directly comparable. Our data also clearly disconfirm the orthogonal structure of the fourfold acculturation model for majority members’ acculturation expectations, suggesting that relying on the specific dimensions defining acculturation expectations may constitute a more valid approach to understand ongoing acculturation processes. 相似文献
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Brosius Hans-Bernd; Mundorf Norbert; Staab Joachim F. 《Int. Journal of Public Opinion Research》1991,3(4):366-383
This study provides a quantitative content analysis of the depictionsof sex roles in the American news magazine Time and the WestGerman news magazine Stern from 1969 to 1988. The underlyingassumption of the study is that advertisements reflect changesin social reality. While most studies focus on explicit aspectsof gender role depictions such as jobs, activities, interactionsand situations, this content analysis also covers implicit aspectsof role depictions such as posture, gestures, and facial expression.Some authors have claimed that these are powerful means of transmittingtraditional sex role stereotypes of women as being submissiveand of men as being dominant. Results indicate that while therehave been considerable changes in the explicit presentationof male and female roles, the implicit presentation remainedquite consistent over the 20-year period. According to thesefindings, sex roles may have changed primarily on the surface,while nonverbal sex role stereotypes still linger on. Differencesbetween the developments in Germany and the US are outlined. 相似文献
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This special issue contains articles describing XML retrieval approaches developed and evaluated during the second year of INEX, the evaluation initiative for XML retrieval. 相似文献
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This study investigated the status of phonological representations in French dyslexic children (DY) compared with reading
level- (RL) and chronological age-matched (CA) controls. We focused on the syllable’s role and on the impact of French linguistic
features. In Experiment 1, we assessed oral discrimination abilities of pairs of syllables that varied as a function of voicing,
mode or place of articulation, or syllable structure. Results suggest that DY children underperform controls with a ‘speed-accuracy’
deficit. However, DY children exhibit some similar processing than those highlighted in controls. As in CA and RL controls,
DY children have difficulties in processing two sounds that only differ in voicing, and preferentially process obstruent rather
than fricative sounds, and more efficiently process CV than CCV syllables. In Experiment 2, we used a modified version of
the Colé, Magnan, and Grainger's (Applied Psycholinguistics 20:507–532, 1999) paradigm. Results show that DY children underperform
CA controls but outperform RL controls. However, as in CA and RL controls, data reveal that DY children are able to use phonological
procedures influenced by initial syllable frequency. Thus, DY children process syllabically high-frequency syllables but phonemically
process low-frequency syllables. They also exhibit lexical and syllable frequency effects. Consequently, results provide evidence
that DY children performances can be accounted for by laborious phonological syllable-based procedures and also degraded phonological
representations. 相似文献
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Carlton R. Meyers William Zimmerli S. David Farr Norbert A. Baschnagel 《Research quarterly for exercise and sport》2013,84(2):332-337
Abstract This study was concerned with the effect of bench-stepping in the Harvard Step Test upon finger and foot reaction time and, secondarily, with ascertaining the relationship, if any, between these reaction times and scores on the Harvard Step Test. The subjects were university freshman males. Reaction times were taken before, immediately after, and four minutes after the stepping exercise for 80 subjects. Thirty-six subjects served as controls, involving the reaction times and pulse counts at the prescribed intervals but without exercise. The findings failed to divulge any discernible effect of stepping exercise upon reaction time, or any apparent relationship between reaction time and the sum of the recovery pulse counts following the exercise. In view of these findings it is suggested that study be directed to two related aspects — the effect of exercise to exhaustion on reaction time, and the effect of strenuous and exhaustive exercise upon speed of movement. 相似文献