全文获取类型
收费全文 | 757篇 |
免费 | 8篇 |
国内免费 | 1篇 |
专业分类
教育 | 414篇 |
科学研究 | 268篇 |
各国文化 | 5篇 |
体育 | 16篇 |
文化理论 | 3篇 |
信息传播 | 60篇 |
出版年
2023年 | 8篇 |
2022年 | 13篇 |
2021年 | 25篇 |
2020年 | 13篇 |
2019年 | 25篇 |
2018年 | 49篇 |
2017年 | 38篇 |
2016年 | 41篇 |
2015年 | 38篇 |
2014年 | 38篇 |
2013年 | 94篇 |
2012年 | 29篇 |
2011年 | 29篇 |
2010年 | 38篇 |
2009年 | 32篇 |
2008年 | 28篇 |
2007年 | 19篇 |
2006年 | 31篇 |
2005年 | 24篇 |
2004年 | 17篇 |
2003年 | 26篇 |
2002年 | 16篇 |
2001年 | 13篇 |
2000年 | 8篇 |
1999年 | 6篇 |
1998年 | 12篇 |
1997年 | 8篇 |
1996年 | 4篇 |
1995年 | 7篇 |
1994年 | 6篇 |
1993年 | 5篇 |
1992年 | 7篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1962年 | 1篇 |
排序方式: 共有766条查询结果,搜索用时 15 毫秒
671.
Tamara Halle Martha Zaslow Maya Cook Maggie Kane Jessica Dym Bartlett 《Early education and development》2019,30(8):990-1008
ABSTRACTResearch Findings: This study examined the development and implementation of six Early Head Start Child Care Partnerships (EHS-CCPs), unique collaborations between EHS grantees and community-based child care partners that expand access to high-quality child care and comprehensive services for low-income infants, toddlers, and their families. Interviews and focus groups with 111 key informants identified similarities across the six EHS-CCPs in initial outreach to community partners for establishing partnerships and approaches to developing partnership agreements but variation in approaches to monitoring quality improvement activities. Benefits and challenges to partnerships for programs and families were noted. Practice or Policy: Findings suggest a need for additional guidance for EHS-CCPs on key components of implementation, including the partnership agreement process, monitoring quality improvement plans, offering support for meeting program requirements, and providing comprehensive services. For example, five of the six partnerships reported the EHS grantee led the development of their partnership agreements. While this approach was attributed to child care partners’ lack of prior experience in developing agreements, further guidance on how to engage partners collaboratively in an agreement process that better emulates the principles of authenticity and equality from the conceptual framework for collaborations in early care and education would be useful. 相似文献
672.
Starting with an elementary problem that appeared in the Putnam mathematics competition, we proceed to discuss some techniques of transcendental number theory and prove the following result. If p, q, r are distinct primes and if c is a real number with the property that pc, qc, rc are integers, then c must be a non-negative integer. The tools used are some linear algebra and complex analysis. The zero-density estimate method discussed here was used by Alan Baker to prove his celebrated theorem on linear forms in logarithms. The question as to whether we can replace three primes by two primes is an open question. 相似文献
673.
The chemical modifications that occur during vulcanization of rubber and methods for controlling the process are discussed. 相似文献
674.
Chenoa S. Woods Toby Park Shouping Hu Tamara Bertrand Jones 《Community College Journal of Research & Practice》2019,43(1):5-25
Academic underpreparedness is an issue for many first-time-in-college students, particularly those entering community colleges. Whereas many underprepared students enroll in developmental education, research has indicated that traditional remediation may not increase students’ chances for success. Therefore, states and colleges have begun to implement new course placement strategies to increase the accuracy of initial course placement and new instructional approaches to better serve their developmental students. Specifically, in 2013, the state of Florida passed Senate Bill 1720 which redesigned developmental coursework and placement policies across the Florida College System. The reform lifted developmental education placement exam testing and course enrollment requirements for certain exempt students, irrespective of prior academic preparation or achievement. The current study focuses on these exempt students—those who had the option to bypass developmental education—who were also underprepared, and their initial course selection and subsequent success in their gateway (introductory college-level) English course. Using statewide student-level data and logistic regression techniques, the results indicated that level of preparation was related to students’ course enrollment and gateway English course success. Students slightly underprepared in reading or writing were more likely than severely underprepared students to enroll in the gateway English class, relative to a developmental reading or writing course. In reading and writing, slightly underprepared students were more likely to pass English, relative to severely underprepared students. The authors consider the findings in light of recent national changes to developmental education and offer recommendations for policy and practice. 相似文献
675.
Wei-Kai Liou Kaushal Kumar Bhagat Chun-Yen Chang 《Journal of Science Education and Technology》2016,25(3):460-473
The present study compares the highly interactive cloud-classroom (HIC) system with traditional methods of teaching materials science that utilize crystal structure picture or real crystal structure model, in order to examine its learning effectiveness across three dimensions: knowledge, comprehension and application. The aim of this study was to evaluate the (HIC) system, which incorporates augmented reality, virtual reality and cloud-classroom to teach basic materials science courses. The study followed a pretest–posttest quasi-experimental research design. A total of 92 students (aged 19–20 years), in a second-year undergraduate program, participated in this 18-week-long experiment. The students were divided into an experimental group and a control group. The experimental group (36 males and 10 females) was instructed utilizing the HIC system, while the control group (34 males and 12 females) was led through traditional teaching methods. Pretest, posttest, and delayed posttest scores were evaluated by multivariate analysis of covariance. The results indicated that participants in the experimental group who used the HIC system outperformed the control group, in the both posttest and delayed posttest, across three learning dimensions. Based on these results, the HIC system is recommended to be incorporated in formal materials science learning settings. 相似文献
676.
Lea?A.?HaldEmail author Jacqueline?de?Nooijer Tamara?van?Gog Harold?Bekkering 《Educational Psychology Review》2016,28(3):495-522
The aim of this review is to consider how current vocabulary training methods could be optimized by considering recent scientific insights in how the brain represents conceptual knowledge. We outline the findings from several methods of vocabulary training. In each case, we consider how taking an embodied cognition perspective could impact word learning. The evidence we review suggests that vocabulary training methods can be optimized by making a congruent link between the words to learn and one’s own perceptual and motoric experiences. In particular, we suggest that motoric information about the meaning of a word could be incorporated into more standard vocabulary training methods. Finally, we consider the impact an embodied cognitive perspective may have on other characteristics of word learning, such as individual differences in learning and variations in learning different types of words, for example words from different word classes and words in different contexts. 相似文献
677.
The authors investigated the use of student‐initiated e‐mail as a supplemental modality for supervision. Nineteen students e‐mailed their instructors weekly during their 15‐week practicum; these e‐mails were analyzed across 3 time periods using the categories of the discrimination model (J. M. Bernard, 1979, 1997) and an adaptation of W. Lanning's (1986) professional behavior category. Although patterns of e‐mails were similar across time, there was a significant decline in the number of e‐mails as the practicum progressed. Significance was found for message focus, with personalization messages and professional behavior/practicum class messages accounting for more than half of the messages across 3 time periods. 相似文献
678.
Hemanth Tumkur Lakshmikantha Naresh Kumar Ravichandran Mansik Jeon Jeehyun Kim Hyo-sang Park 《Journal of Zhejiang University. Science. B》2018,19(11):818-828
Objectives
The study was done to evaluate the efficacy of optical coherence tomography (OCT), to detect and analyze the microdamage occurring around the microimplant immediately following its placement, and to compare the findings with micro-computed tomography (μCT) images of the samples to validate the result of the present study.Methods
Microimplants were inserted into bovine bone samples. Images of the samples were obtained using OCT and μCT. Visual comparisons of the images were made to evaluate whether anatomical details and microdamage induced by microimplant insertion were accurately revealed by OCT.Results
The surface of the cortical bone with its anatomical variations is visualized on the OCT images. Microdamage occurring on the surface of the cortical bone around the microimplant can be appreciated in OCT images. The resulting OCT images were compared with the μCT images. A high correlation regarding the visualization of individual microcracks was observed. The depth penetration of OCT is limited when compared to μCT.Conclusions
OCT in the present study was able to generate high-resolution images of the microdamage occurring around the microimplant. Image quality at the surface of the cortical bone is above par when compared with μCT imaging, because of the inherent high contrast and high-resolution quality of OCT systems. Improvements in the imaging depth and development of intraoral sensors are vital for developing a real-time imaging system and integrating the system into orthodontic practice.679.
The increase in online graduate programs and the online mentoring of student research have led to the need to identify challenges faced by online mentees and successful strategies used by online mentors during the dissertation process. Based on semistructured interviews with ten graduates, strategies for online mentoring and areas of support valued by online doctoral students during the dissertation process are presented in this article. 相似文献
680.
Almerie MQ Matar HE Jones V Kumar A Wright J Wlostowska E Adams CE 《Health information and libraries journal》2007,24(4):283-286
Background: The Polish Medical Bibliography (Polska Bibliografia Lekarska) contains 350 000 records dating from 1979. These records from the fields of medicine, nursing, dentistry, health care systems and preclinical sciences are from nearly 300 biomedical journals published in Poland. Methods: We systematically searched the Polish Medical Bibliography Part II (1996–2006) CD‐ROM (July 2006) using both English and Polish phrases for randomized trials, manually checked results and, for the trials identified in this way, sought these on medline and embase . Results: Systematic searching identified records of 680 randomized trials from all areas of health care. Nearly 40% of these were not found on either medline or embase . Conclusions: The Polish Medical Bibliography should be of interest to health care information specialists concerned with comprehensive searches for trials. 相似文献