1,721,067 research outputs found
Geometric Design of Obstacles and Analysis of Pumping Performance of Valveless Micropump
No full text隨著半導體製程技術逐漸進步，而生醫檢測的目標是將檢測系統微小化，讓整個生醫檢測系統整合至單一晶片上，而微幫浦扮演重要的角色，做為一個檢測用的微幫浦，其適合的流量為20-30 uL/min。根據實驗的結果，改變擋體式無閥門微幫浦中的擋體尺寸，可以改變其操作頻率，也可以改變流量大小。與前人研究做比較，擋體角度10度的type A和擋體角度15度的type B皆在驅動電壓40V之下，最佳操作頻率從前人研究的3.1KHz，降至1.1KHz，其流量也從155.85 uL/min降至56.78 uL/min和26.18 uL/min，不論在操作頻率和流量上，皆比前人研究更適合應用於生醫檢測晶片。本研究更針對單一擋體對微幫浦性能做探討，若將微幫浦整體的性能定為100%，由下游的擋體可約提供70%，上游的擋體可約提供剩餘的30%。單一擋體之微幫浦在高頻下會有逆流現象產生，其裝置可藉由改變壓電片驅動電壓和操作頻率，就可以操控此擋體式無閥門微幫浦的淨流量大小及方向。With continuous progress of semiconductor technology, the objective of biomedical detection was miniaturized. The biomedical detecting system was integraled to a chip, and Micropump play a important element in detecting system which provided 20-30 uL/min suitably. Based on the experimental result, the operation frequency and flow rate of micropump were effected by geometric design of obstacle. Compare with Tu(2005), the optimum volume flow rates of typeA and typeB decreased to 56.78 uL/min and 26.18 uL/min with driving voltage of 40V and working frequency of 1.1KHz. The operation frequency and flow rate of micropump were suitable for biomedical detecting chip. In this study, we discussed pumping performance of single obstacle micropump more. The downstream obstacle provided 70% rectified performance in comparison with micropump with two obstacles, and the upstream obstacle provided surplus 30%approximately. The reverse flow micropump with single obstacle happened at high operating frequency. The flow direction could be control by varying operating frequency and driving voltage
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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