全文获取类型
收费全文 | 102篇 |
免费 | 1篇 |
专业分类
教育 | 67篇 |
科学研究 | 26篇 |
各国文化 | 1篇 |
体育 | 4篇 |
文化理论 | 2篇 |
信息传播 | 3篇 |
出版年
2022年 | 2篇 |
2021年 | 7篇 |
2020年 | 3篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 8篇 |
2016年 | 7篇 |
2015年 | 5篇 |
2014年 | 9篇 |
2013年 | 12篇 |
2012年 | 1篇 |
2011年 | 12篇 |
2010年 | 4篇 |
2009年 | 1篇 |
2008年 | 4篇 |
2007年 | 6篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 3篇 |
2000年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1995年 | 1篇 |
1985年 | 1篇 |
1975年 | 4篇 |
排序方式: 共有103条查询结果,搜索用时 0 毫秒
41.
Li Wang Yu Li Xiao-Yu Yang Bo-Bo Zhang Nelle Ninane Henk J Busscher Zhi-Yi Hu Cyrille Delneuville Nan Jiang Hao Xie Gustaaf Van Tendeloo Tawfique Hasan Bao-Lian Su 《国家科学评论(英文版)》2021,8(4)
Like nanomaterials, bacteria have been unknowingly used for centuries. They hold significant economic potential for fuel and medicinal compound production. Their full exploitation, however, is impeded by low biological activity and stability in industrial reactors. Though cellular encapsulation addresses these limitations, cell survival is usually compromised due to shell-to-cell contacts and low permeability. Here, we report ordered packing of silica nanocolloids with organized, uniform and tunable nanoporosities for single cyanobacterium nanoencapsulation using protamine as an electrostatic template. A space between the capsule shell and the cell is created by controlled internalization of protamine, resulting in a highly ordered porous shell-void-cell structure formation. These unique yolk-shell nanostructures provide long-term cell viability with superior photosynthetic activities and resistance in harsh environments. In addition, engineering the colloidal packing allows tunable shell-pore diameter for size-dependent permeability and introduction of new functionalities for specific molecular recognition. Our strategy could significantly enhance the activity and stability of cyanobacteria for various nanobiotechnological applications. 相似文献
42.
This study focused on whether and how teachers implemented the principles of culturally relevant and sustaining pedagogies and the challenges teachers faced while trying to implement these principles with Syrian students in Turkey. The study was built on the four components of pedagogies: academic achievement; cultural competencies; sociopolitical consciousness; and the sustainability of culture. Qualitative data were obtained through interviews and field notes with four teachers who had Syrian students in their classes and four Syrian students. Content analysis was used to examine the data. The findings revealed that both teachers and students had low expectations of academic achievement. Teachers conducted the teaching–learning process entirely according to the perspectives of students who were from the mainstream culture. Teachers tried to improve the cultural competencies and enhance their sociopolitical consciousness of the Syrian students; however, the attempts were limited and inadequate. Although teachers were aware of the importance of sustaining the Syrian culture, they did not know how to do so. The teachers did not have sufficient competencies or experiences to make revisions or to carry out an effective instructional process tailored to the needs of Syrian students because of an absence of skills and knowledge of multicultural education. 相似文献
43.
This study analyses the functioning of a school as a social system in an atypical context with the purpose of generating propositions to tackle educational problems confronted by socially and economically disadvantaged groups attending these schools. Adopting the constructivist grounded theory, the analysis suggests that there is a kind of “vicious cycle” in the functioning of this atypical school, which adversely affects the school system. Breaking the vicious cycle involves five basic propositions: (1) making school a better place than students’ homes, (2) overcoming the enduring difficulties of working in an atypical school, (3) multiplying learning opportunities, (4) prompting parents to assume more responsibility, (5) locating leadership that makes a difference. These propositions clarify the significance of informal subsystems, school community and the wider environment along with their enabling and blocking effects on a disadvantaged school system. Parallel to other studies on disadvantaged schools, the study highlights the need to refine the orthodox view of the concept of formal education and school, as well as the role of school principal, teachers and parents affiliated with atypical schools. 相似文献
44.
Hasan Deniz 《Journal of Science Education and Technology》2011,20(6):743-749
This paper articulates the importance of epistemological beliefs (EBs) and draws a parallel between EBs literature in educational
psychology and nature of science (NOS) literature in science education. The paper stresses that EBs in science and NOS ideas
have common ground and they can be best improved through explicit-reflective instruction informed by conceptual change theory.
The paper concludes that future studies should explore the factors that mediate the development of EBs in science and NOS
ideas rather than documenting the changes in students’ and teachers’ EBs in science and NOS ideas after explicit-reflective
instruction through pre- and post assessments. 相似文献
45.
46.
47.
Sabri Güngör İnayet Aydın Hasan Basri Memduhoğlu Ebru Oğuz 《International journal of qualitative studies in education》2013,26(10):1349-1372
Respect means consideration of actions and requests of others and confirmation of values of others. School is a social institution where students are equipped with knowledge and skills, as well as fundamental character attributes. Respect among students, teachers, administrators, parents, and other staff at schools is of importance. In this study, the focus group method, including 12 principals and 10 teachers at state primary schools, was employed to explore respect in principal–teacher relations. According to the findings, the participants generally developed professional respect understanding. The teachers presented different definitions of respect associated with hierarchical relations. The participants’ respect behaviors were commonly observed in positive communication and self-improvement. The principals displayed respect for teachers through some guarding behaviors, and the teachers displayed profession-related respect behaviors. The common respect expectations of the participants were as follows: self-improvement, establishment of positive social relations, and unbiased behavior. While the school principals expected obedience and complete fulfillment of assigned tasks from teachers, the teachers expected civility, justice, and guarding administration from principals. The participants regarded improper appearance, behaviors contradictory to rules of good manners and bad habits as disrespectfulness. The school principals regarded abuse of goodwill and false excuses by teachers as disrespectfulness; whereas the teachers regarded oral or behavioral insults by school principals and intervention in their private life as disrespectfulness. 相似文献
48.
Hasan Ebrahimi Shahmabadi Seyed Kazem Bagherpour Doun Seyed Ebrahim Alavi Mehri Mortazavi Zahra Saffari Maryam Farahnak Azim Akbarzadeh 《Indian journal of clinical biochemistry : IJCB》2014,29(3):357-361
Emulsion polymerization was used to synthesize poly butyl cyanoacrylate nanoparticles in presence of steric stabilizer dextran 70. Nanoparticles were characterized by particle size analysis, scanning electron microscopy and light microscopy. Polymerization factors affecting particle size and distribution such as dextran 70, polysorbate 80 (PS 80) and H+ concentration, polymerization time and temperature, and sonication were studied. Distinct concentrations of stabilizer were needed to produce proper nanoparticles. In this case, the appropriate value was 2 % of total volume. At pH 4 significant decrease in production efficiency demonstrated the substantial effect of H+ concentration on nanoparticles. Furthermore significant increases in particle size and distribution was observed at 50 °C compared to room temperature. 0.001 % (v/v) PS 80 represented notable influence on size and distribution. In addition, shaped nanoparticles were obtained by altering polymerization time from 5.5 h to 18 h. Finally, nanoparticle features were influenced by different factors. Appropriate manipulating of such factors can lead to obtaining desirable nanoparticles. 相似文献
49.
50.
Hasan Şeker 《欧洲师范教育杂志》2008,31(4):389-402
It is important that trainee teachers in the faculties of education should develop their critical thinking skills so that they can meet the expectations and needs of their profession. This study aimed at investigating the relationship between critical thinking skills and in‐class questioning behaviours of English Language Teaching (ELT) students at the Faculty of Education at Mugla University. The authors attempted to find out answers to the following questions: ‘What kinds of questions do students in lower and higher critical thinking groups ask?’ and ‘Is there a difference between the questions of students with higher and lower critical thinking scores?’ Three data collection instruments were used: Ennis‐Weir Critical Thinking Essay Test; a reading passage; and a structured interview. The findings obtained suggest that the questions asked by the students of the higher critical thinking score group are not questions that clarify unclear points, but questions asked out of curiosity, to remove the uncertainties, and to lead people to think profoundly. Moreover, these students ask questions to find alternatives, to think the reverse and to head for new ideas. The students in the higher score group experienced thinking processes more intensively than the lower score group. 相似文献