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971.
A novel microfluidic device enabling selective generation of droplets and encapsulation of targets is presented. Unlike conventional methods, the presented mechanism generates droplets with unique selectivity by utilizing a K-junction design. The K-junction is a modified version of the classic T-junction with an added leg that serves as the exit channel for waste. The dispersed phase fluid enters from one diagonal of the K and exits the other diagonal while the continuous phase travels in the straight leg of the K. The intersection forms an interface that allows the dispersed phase to be controllably injected through actuation of an elastomer membrane located above the inlet channel near the interface. We have characterized two critical components in controlling the droplet size-membrane actuation pressure and timing as well as identified the region of fluid in which the droplet will be formed. This scheme will have applications in fluid sampling processes and selective encapsulation of materials. Selective encapsulation of a single cell from the dispersed phase fluid is demonstrated as an example of functionality of this design. 相似文献
972.
Helen Wildy Simon Clarke Irene Styles Kadir Beycioglu 《Educational Assessment, Evaluation and Accountability》2010,22(4):307-326
Part of a 13-nation, cross-cultural study of the extent to which principals perceive their pre-appointment experiences had
prepared them for the job, the International Study of Principal Preparation (ISPP), this paper compares the responses of novice
principals in Turkey and Western Australia. Using a survey based on data from case studies of principals in their first 3 years,
the views of 50 Western Australian and 60 Turkish principals were examined in terms of the difficulty of the problems they
faced and the extent to which they felt prepared for these problems. Responses were analysed by sex, qualification, age at
appointment, school size, and school location. Respondents from both countries found that managing the budget and achieving
work/life balance presented challenges for them while working with parents and acquiring adequate resources were not challenging.
For Turkish respondents, building positive relationships with staff was more challenging than it was for the Australian respondents.
Surprisingly respondents felt well prepared for the tasks they faced, with Australians, females, principals of small schools
in rural and remote locations reporting significantly more positive views about their preparation than their counterparts. 相似文献
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974.
It is often claimed, both in the literature and by public opinion, that the status of teachers has declined sharply compared with the situation in the past. This article takes a more detailed look at the complex phenomenon of the ‘status’ of teachers. It does so on the basis of seven variables which ‘operatiohalise’ the process of social approval: the level of feminisation of the teaching corps, its social background, education, legal position and salary, the degree to which control has been obtained over the profession and its degree of social integration. Although a certain loss of prestige has undeniably occurred in comparison with other professions, it is evident that the status issue is not as clear cut as sometimes implied. In the first place, several contradictory trends were detected amongst the factors studied, indicating that the process of status acquisition and/or loss has not developed in a uniform manner. Moreover, statements concerning the relative status of this particular professional group always have to be related to other professions, regarding which the necessary basic data is not always present. It is evident, nonetheless, that the old (and not always very realistic) image of the ‘schoolmaster’ or ‘mistress’ with a ‘noble vocation’ to fulfil has faded nowadays, without the new ideal of the ‘education specialist’ yet establishing itself in the social context. 相似文献
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Simon Martin Dyson Hala Abuateya Karl Atkin Lorraine Culley Sue Elizabeth Dyson Dave Rowley Members of the Sickle Cell Education Group 《British Educational Research Journal》2010,36(1):125-142
A survey of 569 young people with sickle cell disorder (SCD) in England has found such pupils miss considerable periods of time from school, typically in short periods of two or three days. One in eight has school absences equating to government‐defined ‘persistent absence’. Students with SCD report that they are not helped to catch up after these school absences. Half the children reported not being allowed to use the toilet when needed and not being allowed water in class; a third reported being made to take unsuitable exercise and being called lazy when tired. Children perceived both physical environment (temperature, school furniture) and social environment (being upset by teachers or other pupils) as triggers to episodes of their illness. Policy initiatives on school absences; preventive measures to ensure maintenance of good health; and measures to prevent perceived social attitudes precipitating ill health would also support children with other chronic illnesses at school. 相似文献
980.
The current dominant account of aid to education focuses on schooling and official development assistance and talks in terms of policy work, donor harmonisation and, increasingly, budgetary support. However, this approach is limited in a number of ways. The return of international policy interest in vocational education provides an opportunity to take a look at whether the dominant paradigm is really a solution in all cases. Through an exploration of the evolution of the South African further education and training, this paper illustrates the importance of looking at where a country wants and does not want to learn from. It points to the need to gaze beyond official development assistance to examine the way that dimensions such as cultural diplomacy, commercial interests and solidarity play a role in policy learning. It also draws attention to the often-varied national institutional resources for learning and the complex interplay of individuals, both local and foreign, in the learning process. Finally, it hints that many apparently minor instruments such as exile, study abroad and structured exchange visits may contribute to a far more complex web of policy-related learning than is captured in conventional accounts of policy borrowing/learning that focus on the official level. It may be that a more meaningful discussion of the effectiveness of international cooperation, rather than the more narrow notion of aid, would ensue if such perspectives were taken on board. 相似文献