Rapid mask prototyping for microfluidics     

B. G. C. Maisonneuve  T. Honegger  J. Cordeiro  O. Lecarme  T. Thiry  D. Fuard  K. Berton  E. Picard  M. Zelsmann  D. Peyrade 《Biomicrofluidics》2016,10(2)

With the rise of microfluidics for the past decade, there has come an ever more pressing need for a low-cost and rapid prototyping technology, especially for research and education purposes. In this article, we report a rapid prototyping process of chromed masks for various microfluidic applications. The process takes place out of a clean room, uses a commercially available video-projector, and can be completed in less than half an hour. We quantify the ranges of fields of view and of resolutions accessible through this video-projection system and report the fabrication of critical microfluidic components (junctions, straight channels, and curved channels). To exemplify the process, three common devices are produced using this method: a droplet generation device, a gradient generation device, and a neuro-engineering oriented device. The neuro-engineering oriented device is a compartmentalized microfluidic chip, and therefore, required the production and the precise alignment of two different masks.  相似文献   

Neuro-mechanical adjustments to shod versus barefoot treadmill runs in the acute and delayed stretch-shortening cycle recovery phases     

Cedric Morio  Violaine Sevrez  Pascale Chavet  Eric Berton  Caroline Nicol 《Journal of sports sciences》2016,34(8):738-745

In habitually shod recreational runners, we studied the combined influence of footwear and stretch-shortening cycle (SSC) fatigue on treadmill running pattern, paying special attention to neuro-mechanical adjustments in the acute and 2-day delayed recovery periods. The SSC exercise consisted of a series of 25 sub-maximal rebounds on a sledge apparatus repeated until exhaustion. The acute and delayed functional fatigue effects were quantified in a maximal drop jump test. The neuro-mechanical adjustments to fatigue were examined during two submaximal treadmill run tests of 3 min performed either barefoot or with shoes on. Surface electromyographic (EMG) activities, tibial accelerations and kinematics of the right lower limb were recorded during the first and last 15 s of each run. The main result was that neuro-mechanical differences between the shod and barefoot running patterns, classically reported in the absence of fatigue, persisted in the fatigued state. However, in the delayed recovery phase, rearfoot eversion was found to significantly increase in the shod condition. This specific footwear effect is considered as a potential risk factor of overuse injuries in longer runs. Therefore, specific care should be addressed in the delayed recovery phase of SSC fatigue and the use of motion control shoes could be of interest.  相似文献   

Cinema Demand in Spain: A Cointegration Analysis   总被引：4，自引：3，他引：1  

VÍctor FernÁndez Blanco  JosÉ F. BaÑos Pino 《Journal of Cultural Economics》1997,21(1):57-75

In this paper we explain the decline in cinema attendance in Spain since 1968. We use a cointegration analysis to estimate an individual demand function for cinema, with annual data and in terms of average attendance per inhabitant. We find that cinema is a luxury good and that its demand is elastic with respect to its price. We also show that television acts as a deterrent with regard to cinema attendance. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

Sur l'Acquisition des structures numériques en fin de 3ème     

Une Équipe De L'Irem De Strasbourg 《Educational Studies in Mathematics》1974,5(4):441-459

Sans résuméRésultats d'une enquête effectuée en mai-juin 1973 par une équipe de l'IREM de Strasbourg dans les classes de 3ème du Bas-Rhin.L'équipe comprenait quatre membres de l'IREM:Mathématiciens:—Mademoiselle Anne Scherpereel—Monsieur François PluvinagePsychologues:—Mademoiselle Catherine Bloch—Monsieur Raymond Duval.  相似文献   

Writing instruction for social justice: an investigation into the components of a teacher preparation course     

Émilie Lavoie  Martine Cavanagh 《Literacy》2023,57(2):132-148

Future teachers must notice, navigate, and address ideologies in order to counter inequities in the literacy classroom. This article presents the findings of two teacher educators who have taken up the call to critically reflect on their own underlying beliefs and discourses regarding writing instruction. Through an education design framework, they analysed important components of the course, arguing for a higher degree of visibility of the ideologies and social forces that impact writing instruction. They found that despite encouraging a fairly complex and all-encompassing view of learning to write to the future teachers in their course, the creativity discourse was present passively and the socio-political was downright absent, despite clear social justice aims in the course. They discuss how well-established discourses can serve as gateways to embed the socio-political into the course and address more granularly the question of exclusion through selected mentor texts.  相似文献   

Finite Memory Observers for linear time-varying systems: Theory and diagnosis applications     

Guillaume Graton  Frédéric Kratz  Jacques Fantini 《Journal of The Franklin Institute》2014

Fault detection and diagnosis are important issues in process engineering. Hence, a considerable interest exists in this field now from industrial practitioners as well as academic researchers, as opposed to 30 years ago. The literature on process fault diagnosis, ranging from analytical methods to artificial intelligence and statistical approaches, is largely widespread. In this paper, the modeling of the real process is known, and the state-space representation is used. The properties of the Finite Memory Observer (FMO) are studied from a global point of view for the class of linear time-varying (LTV) systems with stochastic noises. The FMO performances are framed by the study of their properties, and that of their influences on diagnosis results. Fundamentally, the generation of residuals is an essential procedure in diagnosis. So, the determination of the optimal window length of the observer is resolved, and the generation of residuals for diagnosis completed. In the first part, the design of the observer and the residual generation are shown. The second part is devoted to the study of the sensitivity and robustness of the observer and of residuals generated from the observer.  相似文献   

Editorial Computer-aided Engineering Education— CAEE ’91     

ZBYNÉK PITRA 《European Journal of Engineering Education》1992,17(2):115-116

  相似文献   

Motivational Profile and Academic Achievement Among Students Enrolled in Different Schooling Tracks     

THÉRÈSE BOUFFARD  NATHALIE COUTURE 《Educational studies》2003,29(1):19-38

From the contextual perspective, researchers argue that the relevance and weight of motivational variables of students' functioning vary depending on different dimensions related to individual, cultural or situational characteristics. The first objective of this study examined this contention by comparing self-perceptions of competence, learning goals and judgments of usefulness of school subjects as motivational determinants of high school students' commitment and achievement according to their assignment to their learning abilities. The second objective was to compare how these variables related to academic commitment and achievement according to the type of student and two school subjects. Two-hundred-and-twenty-six high school students from a same school participated sixty-one were learning disabled students, 60 were high achievers and 105 were average students. Findings suggest that the relevance of the motivational variables did not vary much across either the type of student or the school subjects. They also support Bandura's view about the primary role of self-perceptions of competence in students' academic commitment and achievement.  相似文献   

The Problems of Female Education in Hungary     

Éva Széchy 《比较教育学》1987,23(1):69-74

  相似文献   

Sur l'assimilation des programmes de 6ème-5ème     

Une Équipe De L'I. R. E. M. De Strasbourg 《Educational Studies in Mathematics》1973,5(2):207-242

  相似文献