Localized removal of layers of metal,polymer, or biomaterial by ultrasound cavitation bubbles     

David Fernandez Rivas  Bram Verhaagen  James R. T. Seddon  Aaldert G. Zijlstra  Lei-Meng Jiang  Luc W. M. van der Sluis  Michel Versluis  Detlef Lohse  Han J. G. E. Gardeniers 《Biomicrofluidics》2012,6(3)

We present an ultrasonic device with the ability to locally remove deposited layers from a glass slide in a controlled and rapid manner. The cleaning takes place as the result of cavitating bubbles near the deposited layers and not due to acoustic streaming. The bubbles are ejected from air-filled cavities micromachined in a silicon surface, which, when vibrated ultrasonically at a frequency of 200 kHz, generate a stream of bubbles that travel to the layer deposited on an opposing glass slide. Depending on the pressure amplitude, the bubble clouds ejected from the micropits attain different shapes as a result of complex bubble interaction forces, leading to distinct shapes of the cleaned areas. We have determined the removal rates for several inorganic and organic materials and obtained an improved efficiency in cleaning when compared to conventional cleaning equipment. We also provide values of the force the bubbles are able to exert on an atomic force microscope tip.  相似文献   

Development of implanted deaf children’s conversational skills     

Gaïd Le Maner-Idrissi  Virginie Dardier  Cécile Pajon  Géraldine Tan-Bescond  Kristell David  Michel Deleau  Benoit Godey 《European Journal of Psychology of Education - EJPE》2010,25(3):265-279

Previous studies of preverbal development have highlighted the recurrent difficulties experienced by deaf children in acquiring knowledge of the social rules and social skills pertaining to discourse. We expected cochlear implants in children with bilateral profound deafness to improve their use of verbal language, so that their communication skill profile resembled that of younger, hearing children. Using conversation samples taken from videos recorded every 6 months over a 2-year period, we monitored the development of communication skills in a group of 18 prelingually profoundly deaf children (mean implantation age, 3 years and 5 months). Results corroborated our hypothesis that the overall communication performances of children with cochlear implants improve, both quantitatively and qualitatively, as early as the first year post-implantation.  相似文献   

Facteurs économiques et sociaux de la planification de l'éducation Colloque de Paris, áécembre 1959     

Michel Debeauvais 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1960,6(1):349-352

Sans résumé  相似文献   

Case studies from morning report: librarians' role in helping residents find evidence-based clinical information     

Atlas MC  Smigielski EM  Wulff JL  Coleman MT 《Medical reference services quarterly》2003,22(3):1-14

In primary care specialties, Morning Report is a traditional vehicle for expanding medical residents' training in diagnosis and treatment. At one academic medical center, residents and faculty in the Department of Family and Community Medicine use case-based teaching, centered around planning and reviewing patient management, to review intriguing cases from patient encounters in the department's hospital service. Seeking to improve the level of evidence-based information exchanged at Morning Report, department leaders invited reference librarians from the health sciences library to attend weekly Morning Report. The librarians saw this as an opportunity not only to improve residents' information-seeking skills, but also to improve librarians' teaching skills and understanding of the needs of users in clinical settings. This paper describes the evolution of librarians' involvement in Morning Report, examples of the kinds of contributions librarians have made in this setting, and changes made in Morning Report sessions to facilitate this activity.  相似文献   

Information Retrieval with a Hybrid Automatic Query Expansion and Data Fusion Procedure   总被引：1，自引：0，他引：1  

Yunjie Xu  Michel Benaroch 《Information Retrieval》2005,8(1):41-65

We propose a hybrid information retrieval (IR) procedure that builds on two well-known IR approaches: data fusion and query expansion via relevance feedback. This IR procedure is designed to exploit the strengths of data fusion and relevance feedback and to avoid some weaknesses of these approaches. We show that our IR procedure is built on postulates that can be justified analytically and empirically. Additionally, we offer an empirical investigation of the procedure, showing that it is superior to relevance feedback on some dimensions and comparable on other dimensions. The empirical investigation also verifies the conditions under which the use of our IR procedure could be beneficial.  相似文献   

Electric propagation on long lines terminated by lumped networks     

Michel G. Malti  Michael Golomb 《Journal of The Franklin Institute》1943,235(1):41-73

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About “The historical meaning of the crisis in psychology” by Lev Semionovitch Vygotski     

Michel Brossard 《European Journal of Psychology of Education - EJPE》2000,15(3):361-367

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Listening beyond the self: How organizations create direct involvement     

Alexandra Michel  Stanton Wortham 《Learning Inquiry》2007,1(2):89-97

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The Central Dogma of molecular biology     

Michel Morange 《Resonance》2009,14(3):236-247

The Central Dogma of molecular biology was enunciated more than 50 years ago by Francis Crick to define the relations between the main informational macromolecules: DNA, RNA and proteins. Since that time, many disciplines have mimicked biology, and introduced their own ‘Central Dogma’. This article is an attempt to review the status of the Central Dogma in the context of the new discoveries that were made during the past fifty years.  相似文献   

Delayed diagnosis and treatment of extreme hypertriglyceridemia due to rejection of a lipemic sample     

Jan Van Elslande  Samira Hijjit  Katrien De Vusser  Michel Langlois  Bjrn Meijers  Ann Mertens  Bart Van der Schueren  Glynis Frans  Pieter Vermeersch 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2021,31(2)

IntroductionMost laboratories routinely determine haemolysis, icterus and lipemia indices to identify lipemic samples and reject potentially affected results. Hypertriglyceridemia is the most common cause of lipemia and severe hypertriglyceridemia (≥ 11.3 mmol/L) is a major risk factor of acute pancreatitis.Laboratory analysisA 56-year-old woman attended the outpatient clinic for a follow-up visit 1 month after a kidney transplantation. Her immunosuppressive therapy consisted of corticosteroids, cyclosporine, and mycophenolic acid. The routine clinical chemistry sample was rejected due to extreme lipemia. The comment “extreme lipemic sample” was added on the report, but the requesting physician could not be reached. The Cobas 8000 gave a technical error (absorption > 3.3) for the HIL-indices (L-index: 38.6 mmol/L) which persisted after high-speed centrifugation. The patient was given a new appointment 2 days later. The new sample was also grossly lipemic and gave the same technical error (L-index: 35.9 mmol/L).What happenedThe second sample was manually diluted 20-fold after centrifugation to obtain a result for triglycerides within the measuring range (0.10–50.0 mmol/L). Triglycerides were 169.1 mmol/L, corresponding to very severe hypertriglyceridemia. This result was communicated to the nephrologist and the patient immediately recalled to the hospital. She received therapeutic plasma exchange the next day and did not develop acute pancreatitis.Main lessonThis case illustrates the delicate balance between avoiding the release of unreliable results due to lipemia and the risk of delayed diagnosis when results are rejected. Providing an estimate of the degree of hypertriglyceridemia might be preferable to rejecting the result.  相似文献