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981.
Jun Wang Stephen Robertson Arjen P. de Vries Marcel J. T. Reinders 《Information Retrieval》2008,11(6):477-497
Collaborative filtering is concerned with making recommendations about items to users. Most formulations of the problem are
specifically designed for predicting user ratings, assuming past data of explicit user ratings is available. However, in practice
we may only have implicit evidence of user preference; and furthermore, a better view of the task is of generating a top-N
list of items that the user is most likely to like. In this regard, we argue that collaborative filtering can be directly
cast as a relevance ranking problem. We begin with the classic Probability Ranking Principle of information retrieval, proposing a probabilistic
item ranking framework. In the framework, we derive two different ranking models, showing that despite their common origin,
different factorizations reflect two distinctive ways to approach item ranking. For the model estimations, we limit our discussions
to implicit user preference data, and adopt an approximation method introduced in the classic text retrieval model (i.e. the
Okapi BM25 formula) to effectively decouple frequency counts and presence/absence counts in the preference data. Furthermore,
we extend the basic formula by proposing the Bayesian inference to estimate the probability of relevance (and non-relevance),
which largely alleviates the data sparsity problem. Apart from a theoretical contribution, our experiments on real data sets
demonstrate that the proposed methods perform significantly better than other strong baselines.
相似文献
Marcel J. T. ReindersEmail: |
982.
The impact of government-to-government endeavors on the intellectual capital of public organizations
This paper draws on sources from two bodies of knowledge: eGovernment and the strategic role of intangible assets in public agencies. It was elaborated in order to measure the variation of the intellectual capital in public organizations involved in government-to-government (G2G) endeavors. In order to achieve this, a heuristic frame was developed to evaluate the impact of G2G endeavors on the components of the intellectual capital of a public agency, namely its human capital, organizational capital, external capital, and innovation capital. Applying this heuristic frame to a G2G endeavor in Brazil linking the Brazilian Central Bank and the Justice Department, a positive impact on the intellectual capital of the Courts of Justice associated with it was detected. Moreover, it was concluded that this G2G undertaking influenced all the components of the intellectual capital of the Courts of Justice alike. Thereafter, the model was validated through a positive and strong statistical correlation between the intellectual capital variation in the Courts of Justice and the value perception of the employees both accrued from the G2G undertaking. Finally, in addition to the research limitations, some concluding remarks are set forth for public managers, practitioners, and academics to help them grasp the potential of using the intellectual capital theory to assess eGovernment initiatives. 相似文献
983.
984.
In recent years the loss of effectiveness of television advertising based on traditional spots has led to the development and consolidation of new forms of advertising. In this article, the authors analyze the recall effectiveness of three new television advertising formats (television billboards, internal telepromotions, and external telepromotions). We use a representative sample of Spanish television audiences to compare the advertising recall generated by each new form of advertising. The empirical analysis, carried out by means of a probit model, shows that television billboards generate better recall than external or internal telepromotions. 相似文献
985.
In 1993 a new comprehensive curriculum for secondary education was introduced in the Netherlands. In that curriculum learning objectives related to environmental education are formulated. This paper describes: (1) the present situation regarding EE in schools in the northern part of the Netherlands on the subject level, as regards the relative importance attributed by teachers to the different objectives of environmental education. (2) the constraints and the need for support when teachers want to pay more attention to the various objectives of environmental education. Teachers pay most attention to the objectives of EE that are aimed at improving the knowledge of the relationship between man and the environment and the environmental problems and their causes. They seem to underestimate the objectives aimed at skills and attitudes. Teachers show only a slight tendency to change their current practice towards more environmental education. The main reasons are described. A considerable number of teachers are willing to use support to implement environmental education if that is offered, but more than half have made no decision yet. The kind of support wanted by teachers differs with different objectives. The paper concludes with a discussion of the prerequisites of a supporting programme for the implementation of environmental education. 相似文献
986.
Jonne Vulperhorst Christel Lutz Renske de Kleijn Jan van Tartwijk 《Assessment & Evaluation in Higher Education》2018,43(3):399-414
To refine selective admission models, we investigate which measure of prior achievement has the best predictive validity for academic success in university. We compare the predictive validity of three core high school subjects to the predictive validity of high school grade point average (GPA) for academic achievement in a liberal arts university programme. Predictive validity is compared between the Dutch pre-university (VWO) and the International Baccalaureate (IB) diploma. Moreover, we study how final GPA is predicted by prior achievement after students complete their first year. Path models were separately run for VWO (n = 314) and IB (n = 113) graduates. For VWO graduates, high school GPA explained more variance than core subject grades in first-year GPA and final GPA. For IB graduates, we found the opposite. Subsequent path models showed that after students’ completion of the first year, final GPA is best predicted by a combination of first-year GPA and high school GPA. Based on our small-scale results, we cautiously challenge the use of high school GPA as the norm for measuring prior achievement. Which measure of prior achievement best predicts academic success in university may depend on the diploma students enter with. 相似文献
987.
de la Torre Eva M. Gómez-Sancho José-María Perez-Esparrells Carmen 《Tertiary Education and Management》2017,23(3):206-221
New public management and increasing levels of competition driven by global rankings are bringing the managerial practices of public and private higher education institutions closer together. However, these two types of institutions still maintain different objectives and traditions and enjoy different degrees of autonomy that are reflected in their internal organisational structures. We study the relative efficiency and productivity performance of private and public universities in Spain through two adaptations of the Malmquist Index. Results show that, in 2009/2010, the greater flexibility of private universities meant a better adjustment between inputs and outputs in the private sector. However, in 2013/2014, public universities had caught up with private universities. Because of the economic crisis, the inputs of public universities have decreased, but this decrease had not fully impacted their results in 2013/2014. 相似文献
988.
Thelma de Jager Mattheus Jacobus Coetzee Ridwan Maulana Michelle Helms-Lorenz Wim van de Grift 《Educational studies》2017,43(4):410-429
The need for quality teaching is reflected in the poor performance of students in international tests. Teachers’ practices and contextual factors could contribute to substandard quality of teaching in South Africa. Several studies indicate that successful learning is largely dependent on the teachers’ practices in class. The focus of the present research was to profile the effective teaching practices of 424 secondary-school teachers in the Gauteng Province, South Africa. Teachers were observed by trained observers using a valid and reliable observation instrument measuring six domains of effective teaching practices. Results showed that teachers find it difficult to differentiate in class and to activate learning. Additionally, teachers with more than 15 years of teaching experience scored lower than teachers with less experience, in all six teaching domains. Presumably, experienced teachers may lack motivation and/or insufficient training in implementing interactive and differentiated teaching methods that are needed for effective teaching practices. 相似文献
989.
Wim J.C.M. van de Grift Seyeoung Chun Ridwan Maulana Okhwa Lee Michelle Helms-Lorenz 《School Effectiveness & School Improvement》2017,28(3):337-349
Six observation scales for measuring the skills of teachers and 1 scale for measuring student engagement, assessed in South Korea and The Netherlands, are sufficiently reliable and offer sufficient predictive value for student engagement. A multigroup confirmatory factor analysis shows that the factor loadings and intercepts of the scales are the same, within acceptable boundaries, in both countries. Therefore, we can compare the average scores of teachers in both countries in a reliable and valid way. The 289 Dutch teachers score significantly better on “creating a safe and stimulating learning climate” and “intensive and activating teaching” and almost significantly on “efficient classroom management”. We find no significant differences in “clear and structured instruction”. The 375 South Korean teachers perform significantly better than the Dutch teachers on “teaching learning strategies” and almost significantly on “differentiating instruction”. Furthermore, we find better student engagement in South Korea. 相似文献
990.