全文获取类型
收费全文 | 307篇 |
免费 | 13篇 |
国内免费 | 1篇 |
专业分类
教育 | 168篇 |
科学研究 | 100篇 |
各国文化 | 8篇 |
体育 | 15篇 |
文化理论 | 3篇 |
信息传播 | 27篇 |
出版年
2023年 | 7篇 |
2022年 | 8篇 |
2021年 | 11篇 |
2020年 | 11篇 |
2019年 | 16篇 |
2018年 | 37篇 |
2017年 | 26篇 |
2016年 | 17篇 |
2015年 | 17篇 |
2014年 | 21篇 |
2013年 | 33篇 |
2012年 | 16篇 |
2011年 | 15篇 |
2010年 | 10篇 |
2009年 | 20篇 |
2008年 | 13篇 |
2007年 | 11篇 |
2006年 | 8篇 |
2005年 | 5篇 |
2004年 | 2篇 |
2002年 | 1篇 |
2001年 | 2篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1994年 | 2篇 |
1992年 | 1篇 |
1988年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 2篇 |
1975年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有321条查询结果,搜索用时 46 毫秒
51.
Average-ability students often do not take full advantage of learning in mixed-ability groups because they hardly engage in the group interaction. This study examined whether structuring collaboration by group roles and ground rules for helping behavior might help overcome this participatory inequality. In a plant biology course, heterogeneously grouped fourth-grade boys (n=164) were randomly assigned to a structured collaboration condition or an unconstrained comparison condition. Results indicated positive effects of structured collaboration on average-ability students’ achievement, motivation, and contribution to the group interaction. Another positive result was that structuring collaboration did not lower the scores of the high and low-ability students on these measures. 相似文献
52.
Personal Review: Sources of sulfide in waste streams and current biotechnologies for its removal 总被引:6,自引:0,他引:6
MAHMOOD Qaisar ZHENG Ping CAI Jing HAYAT Yousaf HASSAN Muhammad Jaffar WU Dong-lei HU Bao-lan 《浙江大学学报(A卷英文版)》2007,8(7):1126-1140
Sulfide-containing waste streams are generated by a number of industries. It is emitted into the environment as dis- solved sulfide (S2- and HS-) in wastewaters and as H2S in waste gases. Due to its corrosive nature, biological hydrogen sulfide removal processes are being investigated to overcome the chemical and disposal costs associated with existing chemically based removal processes. The nitrogen and sulfur metabolism interacts at various levels of the wastewater treatment process. Hence, the sulfur cycle offers possibilities to integrate nitrogen removal in the treatment process, which needs to be further optimized by appropriate design of the reactor configuration, optimization of performance parameters, retention of biomass and optimization of biomass growth. The present paper reviews the biotechnological advances to remove sulfides from various environments. 相似文献
53.
Omid Noroozi Armin Weinberger Harm J.A. Biemans Martin Mulder Mohammad Chizari 《Educational Research Review》2012,7(2):79-106
Learning to argue is an essential objective in education; and online environments have been found to support the sharing, constructing, and representing of arguments in multiple formats for what has been termed Argumentation-Based Computer Supported Collaborative Learning (ABCSCL). The purpose of this review is to give an overview of research in the field of ABCSCL and to synthesize the findings. For this review, 108 publications (89 empirical studies and 19 conceptual papers) on ABCSCL research dating from 1995 through 2011 were studied to highlight the foci of the past 15 years. Building on Biggs’ (2003) model, the ABCSCL publications were systematically categorized with respect to student prerequisites, learning environment, processes, and outcomes. Based on the quantitative and qualitative findings, this paper concludes that ABCSCL environments should be designed in a systematic way that takes the variety of specific conditions for learning into account. It also offers suggestions for educational practice and future research. 相似文献
54.
Farzad Ashrafi Hafez Mohammadhassanzadeh Farhad Shokraneh Ali Valinejadi Karim Johari Nazanin Saemi Alireza Zali Niloofar Mohaghegh Hassan Ashayeri 《Health information and libraries journal》2012,29(4):323-332
Objective: The purpose of this study is to analyse Iranian scientific publications in the neuroscience subfields by librarians and neuroscientists, using Science Citation Index Expanded (SCIE) via Web of Science data over the period, 2002–2008. Methods: Data were retrieved from the SCIE. Data were collected from the ‘subject area’ of the database and classified by neuroscience experts into 14 subfields. To identify the citation patterns, we applied the ‘impact factor’ and the ‘number of publication’. Data were also analysed using HISTCITE, Excel 2007 and SPSS. Results: Seven hundred and thirty‐four papers have been published by Iranian between 2002 and 2008. Findings showed a growing trend of neuroscience papers in the last 3 years with most papers (264) classified in the neuropharmacology subfield. There were fewer papers in neurohistory, psychopharmacology and artificial intelligence. International contributions of authors were mostly in the neurology subfield, and ‘Collaboration Coefficient’ for the neuroscience subfields in Iran was 0.686 which is acceptable. Most international collaboration between Iranians and developed countries was from USA. Eighty‐seven percent of the published papers were in journals with the impact factor between 0 and 4; 25% of papers were published by the researchers affiliated to Tehran University of Medical Sciences. Conclusion: Progress of neuroscience in Iran is mostly seen in the neuropharmacology and the neurology subfields. Other subfields should also be considered as a research priority by health policymakers. As this study was carried out by the collaboration of librarians and neuroscientists, it has been proved valuable for both librarians and policymakers. This study may be encouraging for librarians from other developing countries. 相似文献
55.
Omid Noroozi Maria C. Busstra Martin Mulder Harm J. A. Biemans Hilde Tobi Anouk Geelen Pieter van’t Veer Mohammad Chizari 《Educational technology research and development : ETR & D》2012,60(2):193-221
This study used a sequential set-up to investigate the consecutive effects of timing of supportive information presentation
(information before vs. information during the learning task clusters) in interactive digital learning materials (IDLMs) and
type of collaboration (personal discussion vs. online discussion) in computer-supported collaborative learning (CSCL) on student
knowledge construction. Students (N = 87) were first randomly assigned to the two information presentation conditions to work individually on a case-based assignment
in IDLM. Students who received information during learning task clusters tended to show better results on knowledge construction
than those who received information only before each cluster. The students within the two separate information presentation
conditions were then randomly assigned to pairs to discuss the outcomes of their assignments under either the personal discussion
or online discussion condition in CSCL. When supportive information had been presented before each learning task cluster,
online discussion led to better results than personal discussion. When supportive information had been presented during the
learning task clusters, however, the online and personal discussion conditions had no differential effect on knowledge construction.
Online discussion in CSCL appeared to compensate for suboptimal timing of presentation of supportive information before the
learning task clusters in IDLM. 相似文献
56.
The rapid urbanization and industrialization involve an unsustainable use of natural systems,leading to various problems in cities.The urban hydrological system experiences fluctuating amount of surfac... 相似文献
57.
Quality assurance strategies for affiliated institutions of HE: a case study of the affiliates under National University of Bangladesh 总被引:1,自引:0,他引:1
Gazi Mahabubul Alam Pradip Kumar Mishra Mirja Mohammad Shahjamal 《Higher Education》2014,68(2):285-301
Presently, education is considered as the main weapon for national development. However, this tenet has been challenged by several economists. Their findings give rise to a further question: whilst expansion of education increases globally, what is it exactly that continues to hinder a country’s progression? There is no short answer, but one major area of concern is the quality and relevance of the education available. Research for this paper, the first of its kind in Bangladesh, has been carried out by interviews and observation in the affiliates of the National University of Bangladesh, where 80 % of the students in higher education are the underprivileged. The findings show that the legislators ignore the fact that quality of education in the affiliates is perceived as important. 相似文献
58.
The study seeks to determine the underlying factors contributing to the overrepresentation of minorities in school disciplinary programs. Data from 207 Disciplinary Alternative Education Programs (DAEPs) in Texas are analyzed. The data represent more than 62 % of the student population of Texas school districts. Results support the hypothesis that the ‘whiteness’ of school district undesirably affects the overrepresentation of Black students (but not Hispanic students) in DAEP. Overrepresentation of Black students in disciplinary programs is significantly higher in urban school districts than in rural districts. The findings, however, add a new layer of complexity to the debate on the overrepresentation of minorities in disciplinary programs. This is because not only White school districts are more likely than other districts to exercise their discretionary authority to punish minorities but they also more frequently subject their minority students to mandatory disciplines that are well defined by the state. Plausible explanations of such overrepresentation is offered for future research. Neither wealth nor the districts’ type (urban, suburban, rural and mid-size) have been found to have significant impact on discretionary or mandatory disciplinary actions against minority students. 相似文献
59.
Ultrastructure and phylogeny of Ustilago coicis 总被引:1,自引:0,他引:1
Jing-ze Zhang Pei-gang Guan Gang Tao Mohammad Reza Ojaghian Kevin David Hyde 《Journal of Zhejiang University. Science. B》2013,14(4):336-345
Ustilago coicis causes serious smut on Coix lacryma-jobi in Dayang Town, Jinyun County, Zhejiang Province of China. In this paper, ultrastructural assessments on fungus-host interactions and teliospore development are presented, and molecular phylogenetic analyses have been done to elucidate the phylogenetic placement of the taxon. Hyphal growth within infected tissues was both intracellular and intercellular and on the surface of fungus-host interaction, and the fungal cell wall and the invaginated host plasma membrane were separated by a sheath comprising two distinct layers between the fungal cell wall and the invaginated host plasma membrane. Ornamentation development of teliospore walls was unique as they appeared to be originated from the exosporium. In addition, internal transcribed spacer (ITS) and large subunit (LSU) sequence data showed that U. coicis is closely related to Ustilago trichophora which infects grass species of the genus Echinochloa (Poaceae). 相似文献
60.
Factors Influencing Schoolchildren's Responses to a Questionnaire in Wildlife Conservation Education
Jean-Marie Ballouard Stephen J. Mullin Rastko Ajtic José Carlos Brito El Hassan ElMouden Mehmet Erdogan 《International Journal of Science Education》2013,35(3):469-483
Questionnaires are important tools for assessing attitudes regarding conservation issues. However, they are not easily comparable and their reliability has been insufficiently assessed. We examined factors influencing responses to open- and closed-ended questions about animal conservation to more than 600 schoolchildren (9 years old on average). We analysed the level of understanding, controllable (e.g. sample size) and less controllable factors (e.g. affectivity). Most children responded appropriately to the questions, but subtle changes in the phrasing influenced the answers. Affectivity towards endearing species and spontaneity also influenced the responses whereas small sample sizes (~50 children) provided relatively stable patterns. Overall, we suggest that standardization of questionnaires administered over large spatial and time scales is needed to accurately assess children's attitudes towards conservation issues. 相似文献