全文获取类型
收费全文 | 1942篇 |
免费 | 32篇 |
国内免费 | 5篇 |
专业分类
教育 | 1431篇 |
科学研究 | 161篇 |
各国文化 | 29篇 |
体育 | 162篇 |
综合类 | 5篇 |
文化理论 | 51篇 |
信息传播 | 140篇 |
出版年
2023年 | 17篇 |
2022年 | 38篇 |
2021年 | 57篇 |
2020年 | 74篇 |
2019年 | 109篇 |
2018年 | 137篇 |
2017年 | 134篇 |
2016年 | 114篇 |
2015年 | 78篇 |
2014年 | 99篇 |
2013年 | 384篇 |
2012年 | 122篇 |
2011年 | 72篇 |
2010年 | 48篇 |
2009年 | 55篇 |
2008年 | 49篇 |
2007年 | 42篇 |
2006年 | 30篇 |
2005年 | 32篇 |
2004年 | 30篇 |
2003年 | 26篇 |
2002年 | 38篇 |
2001年 | 13篇 |
2000年 | 17篇 |
1999年 | 8篇 |
1998年 | 14篇 |
1997年 | 8篇 |
1996年 | 9篇 |
1995年 | 10篇 |
1994年 | 10篇 |
1993年 | 5篇 |
1992年 | 12篇 |
1991年 | 9篇 |
1990年 | 9篇 |
1989年 | 10篇 |
1988年 | 7篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1981年 | 4篇 |
1980年 | 6篇 |
1979年 | 5篇 |
1978年 | 3篇 |
1977年 | 7篇 |
1975年 | 5篇 |
1967年 | 1篇 |
1964年 | 1篇 |
1963年 | 1篇 |
1900年 | 1篇 |
排序方式: 共有1979条查询结果,搜索用时 234 毫秒
21.
Arzu Saka Lale Cerrah Ali Rıza Akdeniz Alipaşa Ayas 《Journal of Science Education and Technology》2006,15(2):192-202
The study was carried out with 175 Turkish students by using drawings at different ages understanding of gene, DNA and chromosome concepts. Students from 8th, 9th, 11th grades and, science and biology student teachers were simply asked to draw the structure of gene, DNA and chromosome in a cell and also to give explanations about these three concepts. Differences in understanding between the age groups were found to be significant for the concepts of gene and DNA. None of the groups exhibit sound understanding and regardless of the age levels, students in all groups had alternative ideas about the three concepts investigated. 相似文献
22.
This article summarises the views of 222 grant‐maintained (GM) school's head teachers’ experience of, and reasons for, their schools opting out of local authority control. The survey was conducted on the first 499 secondary schools to go GM. The article investigates issues such as admissions, finances and also the effects of GM status (GMS) on the relationships with, and roles of, local education authorities, the Department for Education, parents and governors. The article provides an overview of moves to GMS and highlights prior aims and reflections. 相似文献
23.
Pedro Gutiérrez Bueno wrote two editions of a chemistry textbook between 1788 and 1802. The paper offers a comparative view
of both editions taking into account Gutiérrez Bueno’s biography, his intended audience and the changes related to the so-called
chemical revolution. Some conclusions are at odds with common images about scientific revolutions and the role of textbooks
in science. The analysis aims to shed some light on the multiple historical forces shaping textbooks and the way in which
scientific change is assimilated by their writers.
This research was partially supported by the program BHA2002-04611-CO3-02 相似文献
24.
Nataša Popivoda‐Endresen 《Higher Education in Europe》1990,15(1):73-79
The differences, so far as Yugoslav legislation is concerned, between “equivalence” and “recognition” are mads clear, and the Yugoslav instances authorized to make decisions on questions of equivalence and recognition are stated and their procedures, briefly described. The 7 multilateral conventions and the 13 bilateral agreements on equivalence and recognition matters are listed. More is said about the various Yugoslav instances empowered to make decisions and to give Information on questions of equivalence and recognition. 相似文献
25.
Antonio Gómez Skarmeta Pedro García López Jesús Egea Payá José Meseguer Navarro Tomás Jiménez García 《Academic Questions》1994,8(1):91-92
Books and articles of academic interest 相似文献
26.
In this work, we presented an analysis of the representation of the special relativity theory (SRT) in the most used texts
in high school, Polimodal level and university level in the teaching in the Argentine Republic, from a historic, epistemological
and didactic perspective. The results show that none of the analyzed texts would allow a contextualized approach on such theory. 相似文献
27.
Ortiz R Jiménez JE García Miranda E Guzmán Rosquete R Hernández-Valle I Rodrigo M Estévez A Díaz A Hernández Expósito S 《Journal of learning disabilities》2007,40(1):80-92
The aims of this study were (a) to determine whether Spanish children with reading disabilities (RD) show a speech perception deficit and (b) to explore the locus and nature of this perceptive deficit. A group of 29 children with RD, 41 chronological age-matched controls, and 27 reading ability-matched younger controls were tested on tasks of speech perception. The effect of linguistic unit (word vs. syllable) and type of phonetic contrast (voicing, place and manner of articulation) were analyzed in terms of the number of errors and the response time. The results revealed a speech perception deficit in Spanish children with RD that was independent of the type of phonetic contrast and of linguistic unit. 相似文献
28.
Jon Zabala Borja González-Albo Ana García-García Aurora Garrido-Domínguez José Ignacio Vidal-Liy Luis R. Álvarez-Díez Soledad Hernando-Tundidor Yara Mostazo-Fernández Teresa Abejón 《Learned Publishing》2023,36(2):205-216
This article analyses the review, acceptance and publication dates of a sample of 21,890 articles from 326 Ibero-American scientific journals from all subject areas and countries included in the Latindex Catalogue 2.0 and published between 2018 and 2020 (freely available as an open access dataset). The aim is to discover evaluation and publication times. The evaluation process takes a median of 110 days, the publication process, a median of 82 days, and the whole process, a median of 224 days. Statistical differences are found according to periodicity, subject areas, countries, existence of a printed version and article type (Call for Papers or General articles). From the data we find that the delay in publication is longer than publishers themselves report to the DOAJ. STEM areas present the most similarity in publication patterns, having a higher number of evaluation days (Ed) than publication days (Pd); Arts and Humanities present the opposite pattern, with a higher Pd than Ed. In the case of Social Sciences, the times are similar. General articles and Call for Papers articles differ in terms of Ed, but not Pd, indicating that Call for Papers revisions are faster. 相似文献
29.
Katharine H. Zeiders Sara D. Bayless Chelsea L. Derlan Adriana J. Umaña-Taylor Kimberly A. Updegraff Laudan B. Jahromi 《Child development》2019,90(3):e373-e385
Ethnic–racial identity (ERI) development and ethnic–racial discrimination are two salient experiences among adolescents in the United States. Despite growing awareness of the costs and benefits of these experiences individually, we know little about how they may influence one another. The current study examined competing hypotheses relating discrimination and components of ERI (i.e., exploration, resolution, affirmation) among a sample of Mexican-origin adolescent mothers (N = 181; Mage at Wave 1 = 16.83, SD = 1.01) across six waves of data. Findings revealed that within-person changes in discrimination predicted subsequent ERI resolution and affirmation; however, ERI did not predict subsequent discrimination. Between-person effects of discrimination on affirmation were significant. Our findings underscore the importance of discrimination experiences in shaping Mexican-origin adolescent mothers’ normative developmental competencies. 相似文献
30.