Nanoparticle image velocimetry at topologically structured surfaces     

Gea O. F. Parikesit  Jeffrey S. Guasto  Salvatore Girardo  Elisa Mele  Ripalta Stabile  Dario Pisignano  Ralph Lindken    Jerry Westerweel 《Biomicrofluidics》2009,3(4)

Nanoparticle image velocimetry (nano-PIV), based on total internal reflection fluorescent microscopy, is very useful to investigate fluid flows within ∼100 nm from a surface; but so far it has only been applied to flow over smooth surfaces. Here we show that it can also be applied to flow over a topologically structured surface, provided that the surface structures can be carefully configured not to disrupt the evanescent-wave illumination. We apply nano-PIV to quantify the flow velocity distribution over a polydimethylsiloxane surface, with a periodic gratinglike structure (with 215 nm height and 2 μm period) fabricated using our customized multilevel lithography method. The measured tracer displacement data are in good agreement with the computed theoretical values. These results demonstrate new possibilities to study the interactions between fluid flow and topologically structured surfaces.  相似文献   

Students’ misconceptions of statistical inference: A review of the empirical evidence from research on statistics education     

Ana Elisa Castro Sotos  Stijn Vanhoof  Wim Van den Noortgate  Patrick Onghena 《Educational Research Review》2007,2(2):98-113

A solid understanding of inferential statistics is of major importance for designing and interpreting empirical results in any scientific discipline. However, students are prone to many misconceptions regarding this topic. This article structurally summarizes and describes these misconceptions by presenting a systematic review of publications that provide empirical evidence of them. This group of publications was found to be dispersed over a wide range of specialized journals and proceedings, and the methodology used in the empirical studies was very diverse. Three research needs rise from this review: (1) further empirical studies that identify the sources and possible solutions for misconceptions in order to complement the abundant theoretical and statistical discussion about them; (2) new insights into effective research designs and methodologies to perform this type of research; and (3) structured and systematic summaries of findings like the one presented here, concerning misconceptions in other areas of statistics, that might be of interest both for educational researchers and teachers of statistics.  相似文献   

Placement,inclusion, law and teachers’ perceptions in Macao’s schools     

Vitor Teixeira  Ana Correia  Elisa Monteiro  Angus C.H. Kuok  Chris Forlin 《International Journal of Inclusive Education》2018,22(9):1014-1032

In Macao, the government has initiated a debate regarding revisions in the Decree Law in order to promote a more inclusive schooling system. In this Special Administrative Region of China, inclusive education is one of three possible types of special education that are likely be legislated in the future. The way the teachers perceive the different aspects related to inclusive education, namely the principles, concepts and law, is essential for its full implementation. The aim of this study is to understand teachers’ perceptions about the proposed amendments in the consultation document for changes in the special education regime. In particular, we focus on teachers’ acceptance of the recommended role of parents, the proposed placement models and expectations for teacher training. A mixed-methods approach with a survey of a sample of 500 teachers in private schools and interviews to a sub-sample of 20 provide the data. While agreeing in principle with the majority of the proposed changes in the Decree Law, there were several reservations made by the teachers, especially regarding the extent of parental choice, placement decisions and teacher training. Recommendations to continue the pathway for a more inclusive education system in Macao and for further research are made.  相似文献   

Book reviews     

Barbara Seels  Elisa J. Slee  Prachee Mukherjee  Gary R. Morrison 《Educational technology research and development : ETR & D》1991,39(2):89-96

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The Use of Online Support Groups to Seek Information about Chronic Illness: Applying the Theory of Motivated Information Management     

Elisa Kanter  Sam M. Dorros 《Communication quarterly》2019,67(1):100-121

The growing number of adults living with chronic illness, combined with the increased availability of illness-specific online support groups, is changing the way individuals seek information about their chronic illnesses. This study utilized elements of the theory of motivated information management (TMIM) to examine how individuals decide to seek information about their chronic illness from online support groups. Adults with chronic illness who had visited at least one online support group in the last six months completed an online survey. Structural equation model findings revealed that, although uncertainty discrepancy about a chronic illness did not predict negative emotional response, both target efficacy and communication efficacy were positively related to information-seeking. Findings aid in explaining specific processes individuals go through when deciding to visit online support groups to gather information about their chronic illnesse, but cannot conclusively support TMIM in this context.  相似文献   

The influence of reading literacy on mathematics and science achievement     

Elisa Caponera  Paolo Sestito  Paolo M. Russo 《The Journal of educational research》2016,109(2):197-204

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文化批评在当代还有用武之地吗?     

玛丽亚·伊丽莎·瑟瓦斯科  方幸福 《华中师范大学学报(人文社会科学版)》2005,44(6):87-91

论文简要分析了当前彻底商业化的社会里从事文化批评所面临的困境,商品拜物教、形象崇拜愈演愈烈,人文领域危机四伏;认为通过精神分析批评和马克思主义批评的结合,可以揭示资本主义社会中被压制和歪曲的文化因素;论文用“后意识形态共生”的理论对中国电影《英雄》作了解读;最后的结论是文化批评在当代仍有存在的价值。  相似文献   

Decreasing inappropriate vocalizations using classwide group contingencies and color wheel procedures: A component analysis     

Emily R. Kirk  Jennifer A. Becker  Christopher H. Skinner  Jamie Yarbrough Fearrington  Sara J. McCane‐Bowling  Christie Amburn  Elisa Luna  Corinne Greear 《Psychology in the schools》2010,47(9):931-943

Teacher referrals for consultation resulted in two independent teams collecting evidence that allowed for a treatment component evaluation of color wheel (CW) procedures and/or interdependent group‐oriented reward (IGOR) procedures on inappropriate vocalizations in one third‐ and one first‐grade classroom. Both studies involved the application of B‐C‐D‐C designs, with the initial B phase involving the application of independent group‐oriented punishment (IGOP) procedures that were applied in all classrooms at the respective schools and maintained across all phases of the studies. In Study I, the C phase involved that application of IGOP, IGOR, and CW; CW was withdrawn in the D phase and reinstated in the subsequent C phase. In Study II, IGOP procedures were supplemented with CW procedures (first C phase), then IGOR procedures were added (D phase) and withdrawn (second C phase). Results from the two studies converge and provide evidence that CW procedures are effective when applied with IGOP procedures and that supplementing them with IGOR procedures may have little classwide impact on inappropriate vocalizations. © 2010 Wiley Periodicals, Inc.  相似文献   

Guiding Students to Develop an Understanding of Scientific Inquiry: A Science Skills Approach to Instruction and Assessment     

Elisa M. Stone 《CBE life sciences education》2014,13(1):90-101

New approaches for teaching and assessing scientific inquiry and practices are essential for guiding students to make the informed decisions required of an increasingly complex and global society. The Science Skills approach described here guides students to develop an understanding of the experimental skills required to perform a scientific investigation. An individual teacher''s investigation of the strategies and tools she designed to promote scientific inquiry in her classroom is outlined. This teacher-driven action research in the high school biology classroom presents a simple study design that allowed for reciprocal testing of two simultaneous treatments, one that aimed to guide students to use vocabulary to identify and describe different scientific practices they were using in their investigations—for example, hypothesizing, data analysis, or use of controls—and another that focused on scientific collaboration. A knowledge integration (KI) rubric was designed to measure how students integrated their ideas about the skills and practices necessary for scientific inquiry. KI scores revealed that student understanding of scientific inquiry increased significantly after receiving instruction and using assessment tools aimed at promoting development of specific inquiry skills. General strategies for doing classroom-based action research in a straightforward and practical way are discussed, as are implications for teaching and evaluating introductory life sciences courses at the undergraduate level.  相似文献   

Could light meal jeopardize laboratory coagulation tests?     

Gabriel Lima-Oliveira  Gian Luca Salvagno  Giuseppe Lippi  Elisa Danese  Matteo Gelati  Martina Montagnana  Geraldo Picheth  Gian Cesare Guidi 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2014,24(3):343-349

Background:

Presently the necessity of fasting time for coagulation tests is not standardized. Our hypothesis is that this can harm patient safety. This study is aimed at evaluating whether a light meal (i.e. breakfast) can jeopardize laboratory coagulation tests.

Materials and methods:

A blood sample was firstly collected from 17 fasting volunteers (12 h). Immediately after blood collection, the volunteers consumed a light meal. Then samples were collected at 1, 2 and 4 h after the meal. Coagulation tests included: activated partial thromboplastin time (APTT), prothrombin time (PT), fibrinogen (Fbg), antithrombin III (AT), protein C (PC) and protein S (PS). Differences between samples were assessed by Wilcoxon ranked-pairs test. The level of statistical significance was set at P < 0.05. Mean % differences were determined and differences between and baseline and 1, 2 and 4h samples were compared with reference change value (RCV).

Results:

A significantly higher % activity of AT was observed at 1 h and 4 h after meal vs. baseline specimen [113 (104–117) and 111 (107–120) vs. 109 (102–118), respectively; P = 0.029 and P = 0.016]. APTT at 2 h was found significantly lower than baseline samples [32.0 (29.9–34.8) vs. 34.1 (32.2–35.2), respectively; P = 0.041]. The results of both Fbg and PS tests were not influenced by a light meal. Furthermore, no coagulation tests had significant variation after comparison with RCV.

Conclusion:

A light meal does not influence the laboratory coagulation tests we assessed, but we suggest that the laboratory quality managers standardize the fasting time for all blood tests at 12 hours, to completely metabolize the lipids intake.  相似文献