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21.
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
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《野草》主题的佛学解读 总被引:2,自引:0,他引:2
孟宏峰 《内蒙古师范大学学报(哲学社会科学版)》2005,34(3):97-101
《野草》主题隐含着一个与佛学苦、空观相吻合的逻辑层次。在现世苦难的打击下,鲁迅常常觉得唯“黑暗与虚无”乃是“实有”,佛学无常无我价值观促使他走向“绝望之为虚妄,正与希望相同”的空无状态。由空开拓出生命的抗争之路,承担起现世世界扫滞除执、反抗绝望的责任是《野草》哲学的关键。诗文吸收佛教勇猛精进的精神,同时消解了佛教因果轮回的唯心思想。 相似文献
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Dr. M.R. Lokeshwar Dr. V.G. Tuteja Dr. A. Fernandez Dr. Meenakshi N. Mehta Dr. V.B. Athavale Dr. Parvaty Krishnan 《Child abuse & neglect》1979,3(3-4)
175 newborns who were admitted to an orphanage in the year 1975–1976 and subsequently died are analysed. Illegitimacy was the major cause for abandoning the babies. 46% of the babies were born in hospitals. 5 babies had congenital anomalies and 11 babies had marks of external injury. 58.8% of the babies abandoned were girls, 82.7% of the babies weighed less than 2.5 kgs. and had some degree of intrauterine growth retardation. The major cause of death was infections which accounted for 79.3% of deaths, of which gastroenteritis (43.4%) was the main killer. Septicemia and bronchopneumonia were the two other major infections that contributed to the deaths. Infections were more common in the low weight babies. Gastroenteritis was probably acquired after introduction of top feeds, due to poor hygiene and occured in all age groups. Majority of babies died of septicemia within 7 days of admission suggesting antenatal and natal infections. Chances of survival increased with increasing weight of the baby. 相似文献
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INTRODUCTION: The study of sexual transmitted diseases is more and more frequent in patient with suspicion of sexual abuse, and this help to the final medical diagnosis. Organisms like Neisseria gonorrhoeae and Treponema indicate a sure sexual contact. However the role of the rest of organisms in the sexual abuse is more difficult of specifying. OBJECTIVE: To know the role of the Gardnerella vaginalis in the diagnosis of sexual abuse in patient with this possible diagnosis. METHODS: Retrospective study of 135 girls with suspicion of abuse, visited from May of 1997 to February of 1998. Vaginal swabs were taken from 45 of 135 girls evaluated. RESULTS: In five patients the vaginal culture were positive to Gardnerella. The characteristics of these five patients are described (age, aggressor, type and duration of the abuse, physical exploration and final diagnosis). All our patients were the pubertal or prepubertal girls. In these patients the final diagnosis settled with the clinical history and the physical exploration, without keeping in mind the result of the culture. CONCLUSION: It is necessary to discard sexual abuse in all prepubertal girl with a positive culture with Gardnerella vaginalis, being difficult to specify the value of the Gardnerella in the adolescent patients. 相似文献
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In addition to serving summative assessment purposes, testing has turned out to be a powerful learning tool. However, while the beneficial effect of testing on learning performances has been confirmed in a large body of literature, the question of exactly how testing influences cognitive and metacognitive processes remains unclear. We therefore set out to investigate the effect of testing on self-regulated learning (SRL) processes. We hypothesized that by recalibrating metacognitive monitoring, regular practice testing can trigger efficient SRL processes and, in turn, foster learning. To test this hypothesis, we exposed first-year undergraduates to a complex neurology module. Participants were randomly assigned to either the practice testing group or a control group. The testing group underwent multiple practice tests during the neurology module, whereas the control group only underwent the multiple practice tests after the course. To assess the impact of practice testing on SRL processes, we combined a think aloud protocol with a metacognitive monitoring self-report measure. Results showed that, compared with controls, participants in the practice testing group were significantly less overconfident in their ability to recall recently learned information and performed better on a posttest questionnaire. Furthermore, mediation analyses confirmed that enhanced learning performance was explained by the use of efficient SRL processes. Therefore, these results allow us to extend the testing effect to SRL, and empirically underscore the central role of monitoring in SRL. Contributions to the fields of practice testing and SRL are discussed. 相似文献
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Higher Education - Global climate change threatens university campuses around the world. However, prior research suggests that universities around the globe tend to prioritize preventing further... 相似文献