排序方式： 共有120条查询结果，搜索用时 515 毫秒
81.
Ioannis Rabias Danai Tsitrouli Eleni Karakosta Thomas Kehagias Georgios Diamantopoulos Michael Fardis Dimosthenis Stamopoulos Thomas G. Maris Polykarpos Falaras Nikolaos Zouridakis Nikolaos Diamantis Georgios Panayotou Dimitrios A. Verganelakis Garyfalia I. Drossopoulou Effie C. Tsilibari Georgios Papavassiliou 《Biomicrofluidics》2010,4(2)
One of the most significant challenges implementing colloidal magnetic nanoparticles in medicine is the efficient heating of microliter quantities by applying a low frequency alternating magnetic field. The ultimate goal is to accomplish nonsurgically the treatment of millimeter size tumors. Here, we demonstrate the synthesis, characterization, and the in vitro as well as in vivo efficiency of a dextran coated maghemite (γ-Fe2O3) ferrofluid with an exceptional response to magnetic heating. The difference to previous synthetic attempts is the high charge of the dextran coating, which according to our study maintains the colloidal stability and good dispersion of the ferrofluid during the magnetic heating stage. Specifically, in vitro 2 μl of the ferrofluid gives an outstanding temperature rise of 33 °C within 10 min, while in vivo treatment, by infusing 150 μl of the ferrofluid in animal model (rat) glioma tumors, causes an impressive cancer tissue dissolution. 相似文献
82.
Stefanos Karamaroudis Eleni Poulogiannopoulou Marinos G. Sotiropoulos Thomas Kalantzis Elizabeth O. Johnson 《Anatomical sciences education》2020,13(6):694-706
In light of the current shifts in medical education from traditional lectures to more active teaching modalities, a peer-teaching program was introduced to a compulsory, second-year neuroanatomy course. A cross-sectional survey of 527 medical students in the six-year medical program of the National and Kapodistrian University of Athens was administered. The primary aim of the survey, which was distributed to second- through sixth-year medical students, who had completed the neuroanatomy course, was to assess student perception of peer teachers (PTs). Across the five years assessed, students increasingly acknowledged the contribution of PTs to their learning (P < 0.001). Attributes of PTs (e.g., contribution to learning, motivation, effective usage of material, and team environment) were significantly related to the student's opinion of the importance of laboratory activities (P < 0.001). Students who received “average” final grades scored the importance of laboratory exercises, and by inference PTs, significantly lower than students who received “excellent” final grades (P < 0.05). The amount of training that PTs had received was also significantly related to student perceptions of a PT's contribution. Better trained PTs were associated with significantly higher scores regarding learning, motivation, and positive environment compared to less trained PTs (P < 0.05). The results of the present study show that peer-teaching was well received by students attending the neuroanatomy course. While the results express the evolution of the program across the years, the findings also show that learners believed that PTs and the laboratory program contributed significantly to their understanding of neuroanatomy. 相似文献
83.
Theresa L. Miyashita Eleni Diakogeorgiou Kaitlyn Marrie 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(2):180-188
AbstractHead impacts resulting in a concussion negatively affect the vestibular system, but little is known about the effect of subconcussive impacts on this system. This study’s objective was to determine if subconcussive head impacts sustained over one competitive lacrosse season, effect sway velocity. Healthy Division I male lacrosse players (n = 33; aged 19.52 ± 1.20 years) wore instrumented helmets to track head impact exposures. At the beginning and end of the season the players completed an instrumented Balance Error Scoring System assessment to assess sway velocity. Score differentials were correlated to the head impact exposure data collected via instrumented helmets when averaged within participant. Paired samples t-tests revealed a post-season increase in sway velocity on the double leg stance, firm surface (p = 0.002, d = 0.59); tandem stance, firm surface (p = 0.033, d = 0.39) and double leg, foam surface (p = 0.014, d = 0.45) A significant correlation was found between change in tandem stance, firm surface sway velocities and linear acceleration (p < 0.001, r = 0.65). It appears subconcussive impacts may result in tandem stance balance deficits. Repetitive head impacts may negatively affect sway velocity, even in the absence of a diagnosed concussion injury. 相似文献
84.
Georgia Liarakou Costas Gavrilakis Eleni Flouri 《Journal of Science Education and Technology》2009,18(2):120-129
Investigating knowledge, perceptions as well as attitudes of public that concern various aspects of environmental issues is
of high importance for Environmental Education. An integrated understanding of these parameters can properly support the planning
of Environmental Education curriculum and relevant educational materials. In this survey we investigated knowledge and attitudes
of secondary school teachers in Greece towards renewable energy sources, particularly wind and solar energy systems. A questionnaire
with both open and close questions was used as the main methodological instrument. Findings revealed that although teachers
were informed about renewable energy sources and well disposed towards these sources, they hardly expressed clear positions
regarding several issues about wind and solar energy technologies and farms. Moreover such themes are limited integrated in
teaching either as extra curricular educational programs or through the curriculum. These findings cannot confirm that teachers
could influence students’ opinion towards renewable energy systems. Thus, authorities should invest more in Environmental
Education and relevant Teachers' Education. 相似文献
85.
Eleni Oikonomidoy 《Globalisation, Societies & Education》2009,7(1):23-39
Drawing from the findings of a qualitative study with female refugee high school students from Somalia in the US, this paper attempts to provide a window to understanding the multilayered character of newcomer students’ academic identity construction. The students’ micro‐level processes of creating spaces for belonging at school are linked to their macro‐level extra‐educational connections at the societal and global levels. The framework presented attempts to sensitise educators to increase their attention to the global‐socio‐cultural contexts of education and strive to create spaces within schools for the recognition and facilitation of students’ complex identities. 相似文献
86.
The present study revisited the problem of estimating Olympic success by critical demo-economic indicators. The sample consisted of the 75 winner countries at the Athens 2004 Olympic Games (not previously analyzed). Medal totals were log-linearly regressed on land, population, GDP, urban population, inflation, growth rate, unemployment, labor force, health expenditures, ex-host, and team size. Multiple regression assumptions were tested with proper diagnostics including collinearity. Olympic team size was the best single predictors of Olympic medals (R2 = 0.690, p < 0.001), and as an alternative criterion variable was significantly regressed on population, growth rate, health expenditure, and unemployment (R2 = 0.563, p < 0.001). Medal totals were significantly regressed on population, ex-host, health expenditure, growth rate, and unemployment (R2 = 0.541, p < 0.001). The classical population-GDP model extracted only 28% of the variance in total medals (R2 = 0.277, p < 0.001), and this was slightly improved when combined with unemployment (R2 = 0.365, p < 0.001). It appears that the size of the Olympic team plays the role of transmitting the composite impact of a country's size and economy to the end-phase of Olympic success. Winning Olympic medals depends on the combined potential of population, wealth, growth rate, unemployment, ex-host, and social-sport expenditures. Larger and wealthier countries win more medals by “producing” larger Olympic teams as a result of possessing more athletic talents and better support for social and sport related activities. 相似文献
87.
88.
Eleni Prokou 《欧洲教育》2014,46(1):34-54
This article argues that adult education/lifelong learning policies in Greece, as these are expressed by law 3879/2010 "Development of Lifelong Learning and Other Provisions," have the characteristics of the "statist" model of lifelong learning in Europe, namely strong governmental control and centralization. However, there are also characteristics of the "social partnership" model: regulations through a legal framework and stronger involvement of social partners and local government. Finally, under the influences of European education policy, a special emphasis in Greek policies is placed on the issues of accreditation/quality assurance and the formation of a qualifications framework. These issues are dominant in the market-driven systems of lifelong learning, are consistent with the model of "voluntary partnership," and stress the individualization of the responsibility for learning. 相似文献
89.
Eleni Loizou 《Early Childhood Education Journal》2006,33(6):425-431
This study aimed to investigate the explanations of 80 kindergarten children on pictorial humor. The children were asked to observe and describe a specific visual stimulus, and say whether they considered it as funny providing their rationale. The study was developed on the basis of humor being an incongruity thus the data were examined against McGhee’s stages of humor development and Brown’s categories of Visual Humor. Findings suggest that kindergartners are capable of recognizing the main and/or minor incongruities in a funny picture and providing reasoning for it. Moreover, there are no gender differences in reference to these variables. These findings come to broaden the specific developmental approaches provided by McGhee and Brown, and suggest a new category to frame children’s responses to pictorial humor, the Multiple Conceptual Visual Incongruities category. It is also suggested that the use of visual stimuli with multiple incongruities provides an excellent forum for investigating children’s conceptual abilities. 相似文献
90.
Eleni Moschovaki Sara Meadows Anthony D. Pellegrini 《European Journal of Psychology of Education - EJPE》2007,22(4):405-420
This study examines how teachers’ use of affective strategies (voice intonation, dramatization, personal involvement comments)
during the reading and discussion of books influence young children’s affective reactions (dramatization, personal engagement,
language play comments). Twenty kindergarten teachers read four books, two fiction and two information ones (narrative/expository
text).
We found significant differences in both teachers’ affective presentation and young children’s affective reactions between
fiction and information books, between the two fiction books but not between the narrative and expository text. A strong bi-directional
relationship was found between teachers’ affective presentation of stories and young children’s affective reactions. In particular,
teachers’ personal involvement comments prompted children’s personal engagement reactions, teachers’ reenactment was followed
by children’s imitations of such reenactments and teachers’ voice intonation elicited children’s personal engagement comments.
On the other hand, children’s use of paralinguistic cues and personal engagement comments reinforced teachers’ use of voice
intonation and personal involvement comments. Finally, text features, such as rhyming, were followed by children’s language
play. 相似文献