全文获取类型
收费全文 | 3105篇 |
免费 | 58篇 |
国内免费 | 23篇 |
专业分类
教育 | 2199篇 |
科学研究 | 304篇 |
各国文化 | 25篇 |
体育 | 301篇 |
综合类 | 50篇 |
文化理论 | 53篇 |
信息传播 | 254篇 |
出版年
2023年 | 21篇 |
2022年 | 53篇 |
2021年 | 91篇 |
2020年 | 112篇 |
2019年 | 201篇 |
2018年 | 216篇 |
2017年 | 205篇 |
2016年 | 164篇 |
2015年 | 135篇 |
2014年 | 131篇 |
2013年 | 557篇 |
2012年 | 138篇 |
2011年 | 145篇 |
2010年 | 129篇 |
2009年 | 97篇 |
2008年 | 78篇 |
2007年 | 97篇 |
2006年 | 90篇 |
2005年 | 85篇 |
2004年 | 48篇 |
2003年 | 56篇 |
2002年 | 55篇 |
2001年 | 54篇 |
2000年 | 31篇 |
1999年 | 20篇 |
1998年 | 13篇 |
1997年 | 12篇 |
1996年 | 12篇 |
1995年 | 10篇 |
1994年 | 8篇 |
1993年 | 9篇 |
1992年 | 7篇 |
1991年 | 10篇 |
1990年 | 14篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 7篇 |
1986年 | 8篇 |
1985年 | 6篇 |
1984年 | 3篇 |
1981年 | 4篇 |
1980年 | 3篇 |
1979年 | 4篇 |
1978年 | 7篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1970年 | 3篇 |
1963年 | 3篇 |
排序方式: 共有3186条查询结果,搜索用时 15 毫秒
61.
腐蚀钼阴极尖端溶液的配制 总被引:1,自引:1,他引:1
报导了一种配制腐蚀阴极尖端溶液的方法,用这种方法配制的溶液来腐蚀钼阴极尖端,得到了尖端曲率半径为0.1——0.6μm,这样的阴极尖端其发射特性能够满足我们用这种金属(钼)树料来制作阴极尖端的要求。 相似文献
62.
如何在高职高专院校开设好商务翻译课已经成为众多教育工作者特别在高职高专院校从事外语教学工作者研究的课题。该论文从高职高专翻译教学实际出发,提出了教学中应遵循的原则并具体讨论了高职高专商务翻译课程训练的方法、教材选择等问题。 相似文献
63.
生物资源是国家重要的战略性资源。组学时代的到来催生数据量级的增长将推动生命科学研究向"数据密集型科学"的新范式转变。因此,生物资源的大数据与生物资源本身一样,也已成为国家战略资源,成为国际科技与产业竞争热点和战略制高点。目前,我国亟待加快建设国家级战略生物资源大数据共享平台,建立全面支撑生物资源保存、利用、开发、挖掘和可持续利用的技术体系,形成包括数据质控流程、数据存储中心、数据共享中心和数据转化中心的可对海量数据进行有效管理、高效分析和可用、易用的综合数据系统,支撑我国生物资源前沿领域科学发现和产业创新发展。中国科学院战略生物资源信息平台配合中国科学院战略生物资源服务网络的建设,形成了包括数据管理规范、数据汇集平台、数据门户和数据可视化系统在内的一套完整的数据生态,从而有效地促进了中国科学院战略生物资源数据的集成、共享、挖掘和利用。目前,该平台已经覆盖中国科学院植物园、标本馆、生物遗传资源、实验动物、生物多样性监测网络5类资源的42家单位,集成6 981 465条数据,且全部数据资源都可以通过数据门户进行共享。 相似文献
64.
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
65.
Individual, family, and neighborhood factors distinguish resilient from non-resilient maltreated children: a cumulative stressors model 总被引:2,自引:0,他引:2
OBJECTIVE: Children who are physically maltreated are at risk of a range of adverse outcomes in childhood and adulthood, but some children who are maltreated manage to function well despite their history of adversity. Which individual, family, and neighborhood characteristics distinguish resilient from non-resilient maltreated children? Do children's individual strengths promote resilience even when children are exposed to multiple family and neighborhood stressors (cumulative stressors model)? METHODS: Data were from the Environmental Risk Longitudinal Study which describes a nationally representative sample of 1,116 twin pairs and their families. Families were home-visited when the twins were 5 and 7 years old, and teachers provided information about children's behavior at school. Interviewers rated the likelihood that children had been maltreated based on mothers' reports of harm to the child and child welfare involvement with the family. RESULTS: Resilient children were those who engaged in normative levels of antisocial behavior despite having been maltreated. Boys (but not girls) who had above-average intelligence and whose parents had relatively few symptoms of antisocial personality were more likely to be resilient versus non-resilient to maltreatment. Children whose parents had substance use problems and who lived in relatively high crime neighborhoods that were low on social cohesion and informal social control were less likely to be resilient versus non-resilient to maltreatment. Consistent with a cumulative stressors model of children's adaptation, individual strengths distinguished resilient from non-resilient children under conditions of low, but not high, family and neighborhood stress. CONCLUSION: These findings suggest that for children residing in multi-problem families, personal resources may not be sufficient to promote their adaptive functioning. 相似文献
66.
67.
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
68.
Petr Novotný Karolína Kotvaltová Sezemská Romana Schubertová Vanda Janštová 《Learned Publishing》2023,36(2):194-204
There is evidence that national scientific journals are important for local communities despite their limited audience due to national languages and topics, like in pedagogy. However, it is not easy to assess the level of scientific rigour of local journals, as most do not have available scientometric data and are often published in minority languages. We hypothesize that a possible manifestation of a latent trait of inner authenticity of the scientific journal (meaning the journal is accepted by a community interested in developing the field which conducts internationally accepted research) could be H-index of the editorial board members. To test this approach, we evaluated H-index and gender of editorial board members (n = 490) from 17 Czech and Slovak national science-oriented scientific pedagogical journals which were not indexed or indexed in Erih+ or Scopus, and compared this with the five lowest-rated journals from the same field indexed in the Web of Science (WoS) database. The H-index of editorial board members was somewhat higher in indexed journals with those from WoS showing higher scores, and the number of board members with no discernable H-index was far greater in non-indexed journals. Editorial boards of journals indexed in WoS were mostly male, compared to a dominance of women on boards of non-indexed journals. Acknowledging the limited sample, it appears that the H-index of editorial board members may be a way to value national scientific journals. 相似文献
69.
70.