全文获取类型
收费全文 | 6571篇 |
免费 | 93篇 |
国内免费 | 5篇 |
专业分类
教育 | 4454篇 |
科学研究 | 774篇 |
各国文化 | 48篇 |
体育 | 600篇 |
文化理论 | 31篇 |
信息传播 | 762篇 |
出版年
2022年 | 39篇 |
2021年 | 65篇 |
2020年 | 103篇 |
2019年 | 159篇 |
2018年 | 201篇 |
2017年 | 201篇 |
2016年 | 194篇 |
2015年 | 116篇 |
2014年 | 160篇 |
2013年 | 1131篇 |
2012年 | 154篇 |
2011年 | 152篇 |
2010年 | 134篇 |
2009年 | 127篇 |
2008年 | 156篇 |
2007年 | 153篇 |
2006年 | 111篇 |
2005年 | 106篇 |
2004年 | 93篇 |
2003年 | 89篇 |
2002年 | 96篇 |
2001年 | 123篇 |
2000年 | 140篇 |
1999年 | 130篇 |
1998年 | 62篇 |
1997年 | 52篇 |
1996年 | 66篇 |
1995年 | 59篇 |
1994年 | 66篇 |
1993年 | 54篇 |
1992年 | 110篇 |
1991年 | 102篇 |
1990年 | 89篇 |
1989年 | 119篇 |
1988年 | 78篇 |
1987年 | 76篇 |
1986年 | 81篇 |
1985年 | 105篇 |
1984年 | 72篇 |
1983年 | 72篇 |
1982年 | 76篇 |
1981年 | 58篇 |
1980年 | 65篇 |
1979年 | 78篇 |
1978年 | 75篇 |
1977年 | 59篇 |
1976年 | 61篇 |
1974年 | 49篇 |
1973年 | 43篇 |
1969年 | 41篇 |
排序方式: 共有6669条查询结果,搜索用时 15 毫秒
101.
The present experiment determined whether associative strength based upon 15 CS-US pairings at various interstimulus intervals (ISIs) could survive shifts of the ISI to influence the subsequent acquisition of the nictitating membrane (NM) CR. The choice of 15 preshift pairings was based upon previous work, which had shown that this training level produced substantial associative strength without NM CR acquisition. Consequently, this experiment, by shifting the ISI before the beginning of CR acquisition, served as an extension to traditional ISI-shift studies that have imposed the manipulation after CR acquisition. The findings of the experiment indicated that 15 preshift pairings in Stage 1 at ISIs from 250 to 4,000 msec were as effective as 15 pairings at a 500-msec ISI in determining the number of trials to the first NM CR in Stage 2 in which the training ISI was 500 msec. Moreover, 15 pairings in Stage 1 at ISIs from 250 to 2,000 msec were equivalent to 15 pairings at 500 msec in controlling the number of trials to 10 successive NM CRs in Stage 2. These outcomes demonstrate that, within a large ISI range, the associative strength based upon relatively few pairings is preserved despite various shifts of the ISI. Therefore, these results suggest that the reductions in CR performance, which have been consistently observed in traditional studies following ISI shifts, are not due to the loss of associative strength. 相似文献
102.
Marcia Eugenio-Gozalbo Raquel Pérez-López Juan-Carlos Tójar-Hurtado 《The Journal of environmental education》2020,51(3):246-255
ABSTRACTThe presence of learning gardens in Spain is growing, and the current scenario is highly diverse in relation to issues such as participatory models or purposes, among others. In the context of the 1st National Meeting on organic learning gardens, we convened eight expert practitioners in a focus group. Their discourse was analyzed through content analysis, after which four categories were selected for co-occurrence analyses. The most important questions for university garden-based practitioners in the country are presented, related to actors involved, functions that gardens fulfill, strengths of these educational resources, and requirements for their consolidation. 相似文献
103.
104.
T R Shankar Raman 《Resonance》1996,1(7):52-61
Deer are some of the commonest, most visible, and attractive mammals in many forests and grasslands of India. They display a fascinating variety in their antlers, social systems, herd-forming behaviour, and ecology. Unfortunately, several factors have brought some species to the brink of extinction today. 相似文献
105.
Paula T. McWhirter Joyce A. Brandes Kendra L. Williams-Diehm Shannon Hackett 《Teacher Development》2016,20(1):1-17
The purpose of this investigation was to determine the extent to which pre-service educators’ interpersonal characteristics affected their attitudes toward teaching students with disabilities (inclusion), as measured by the FIRO-B and ATIES pre- and post-course. The FIRO-B was administered to assess expressed and wanted aspects of three interpersonal needs: personal inclusion, affection and control. The ATIES was administered to measure attitudes toward classroom inclusion of students with physical, academic, behavioral and social disabilities. Repeated measures ANOVAs revealed a main effect for wanted inclusion and an interaction effect for expressed inclusion and expressed affection on attitudes toward classroom inclusion. Ultimately, these findings reveal how unique relational characteristics may influence preparation initiatives and may encourage consideration of how individual factors may mediate teacher training and preparation. 相似文献
106.
Neil B. Marks and Richard T. O'Connell 《Decision Sciences Journal of Innovative Education》2003,1(2):259-272
In this paper, a method for analyzing data from student evaluations of teaching is presented. The first step of the process requires development of a regression model for teacher's summary rating as a function of student's expected grade. Then, two‐sigma control charts for individual evaluation scores (section averages) and residuals from the regression model are used to identify both excellent and poor outcomes. The performance of an individual whose scores are out of control on both charts cannot be explained by expected grade and therefore is worthy of note. 相似文献
107.
To obtain confirmation of the findings of the authors' earlier comparison of ever-pregnant and nonpregnant Black high school students from Tennessee, 16 students confirmed to be pregnant were substituted for the 33 subjects in the original study whose pregnancy status was based solely on self-report. The nonpregnant control group of 251 teens was utilized in both analyses. Although the confirmed pregnant group was too small to repeat the regression analysis, striking concordance of findings between the 2 studies emerged for all dependent variables except the Eysenck Personality Questionnaire anxiety scale. The lower anxiety scores recorded among subjects in the original study may be either a statistical artifact or a reflection of the fact that these pregnant teens remained in school while subjects in the second study were enrolled in programs centered around their pregnant status. Sexual activity scores were strong or moderate significantly more often in both groups of pregnant teens compared to their nonpregnant counterparts. Interesting was the finding that 81% of pregnant teens regarded romance novels and soap operas to be accurate portrayals of real-life dating relationships compared to only 49% of nonpregnant teens. On the other hand, only 56% of the pregnant subjects regarded their own relationships to have this romantic quality. In a future study, the role of such uncritical romantic ideals in adolescent pregnancy risk will be investigated in a larger sample. 相似文献
108.
The goal of this study was to examine the means used by textbook authors to introduce, define, and explain the mole concept in high school and introductory college chemistry textbooks. The analysis was framed by four questions:
- 1 How is the mole defined?
- 2 What concepts about the atom are introduced prior to the mole?
- 3 Is Avogadro's constant presented as an experimentally determined value?
- 4 What is the context for introducing the mole?
- 1 Two ways of defining the mole dominate the texts. One way defines the mole as Avogadro's number (6.02 × 1023) particles; the other method defines the mole in terms of carbon-12.
- 2 All texts that present a definition in terms of C-12 introduce and define concepts about the atom prior to introducing the mole.
- 3 Most texts at all levels point out that the value 6.02 × 1023 is an experimentally determined quantity.
- 4 Nearly all texts discuss the mole in relation to die problem of finding a way to count particles that are too small to be directly weighed. Most texts also use a familiar counting unit, such as the dozen, to introduce the mole by analogy.
109.
Yujeong Park Mary T. Brownell Elizabeth F. Bettini Amber E. Benedict 《Exceptionality》2019,27(1):1-17
The purpose of this study was to review and analyze effective classroom reading practices for early graders, using information gathered from the existing content-general and content-specific observation protocols measuring teachers’ classroom reading practices. Dimensions and constructs from 28 observation studies were synthesized to identify classroom instructional practices that have positive impacts on student achievement. Findings revealed that (a) instructional support, emotional support, and classroom management have positive impacts on student achievement, (b) the degree to which instructional practices are effective depends on students’ particular learning needs, and (c) students’ entering skills and primary language are associated with instructional effectiveness in reading. Challenges and implications for future research on effective instructional strategies for special education and the development of an observational protocol for special education teacher effectiveness are discussed. 相似文献
110.
Rosemarye T. Taylor Lisa Karcinski 《Mentoring & Tutoring: Partnership in Learning》2016,24(3):213-227
The purpose of our study was to determine the extent to which differences in a mentor model for science and mathematics teachers accounted for variances in mentoring effectiveness and persistence rates of teachers. School district designee, mentor, and teacher perceptions of mentoring support were collected through the use of interviews and surveys and analyzed using the grounded theory approach and open coding. Findings revealed that teachers and mentors recommended that future mentor models provide strong support and more face-to-face meetings. The most common change mentors made was that they incorporated new strategies into their teaching. Findings offer insight for structuring mentor models to increase effectiveness and persistence of teachers and build the capacity of mentors. 相似文献