1,721,391 research outputs found
CIL:21991
No full textDidinium captures Paramecium. A moment after initial contact when toxicysts enter Paramecium. The strand of toxicysts can be seen between the two organisms, and Didinium will use the anchored toxicysts to reel in Paramecium to the awaiting proboscis which is opening to accept its prey. The opening of the proboscis might be seen better in the same pair taken at a slightly different angle (CIL:21993). Also showing metachronous waves of cilia within the two characteristic ciliary girdles of Didinium nasutum; the waves on Paramecium may be paralyzed due to the effects of the attached toxicysts. This micrograph was taken in 1968 by G. Antipa on a Cambridge Mark IIA operating at 20kV. The negative magnification is 495X. Further details are available at Wessenberg, H. and Antipa, G. 1970. Capture and ingestion of Paramecium by Didinium nasutum. J. Protozool. 17:250-270
Design of Control System of DEXA Forearm Bone Densimeter Based on ADSP-21991
Get PDF结合医疗应用背景，以美国SUNTEC公司的实际需要设计开发了一个基于ADSP-21991的DEXA前臂型骨密度仪的主控系统，包括系统电路和驱动程序。为了为设计工作提供严密的理论依据，也同时为了比较完善的描述系统电路和驱动程序，本文还对骨结构相关医学理论、骨密度测定技术以及DEXA原理作了研究。按照顺序，本文的研究内容主要包括：首先，对骨密度的测定技术进行了研究。对双能X射线吸收法（DEXA）骨密度仪的测量原理及其前臂扫描的医学理论进行了探讨，并对骨密度仪中主要控制对象作了分析。其次，参考丹麦DTX-200系列DEXA骨密度仪的系统主板的结构和性能，设计开发了基于ADSP-21991的仪器系统主...This article developed a kind of control system of DEXA forearm bone densimeter based on ADSP-21991, combining the background of medical treatment and according to the demand of American company―SUNTEC Inc. This system involves systemic circuit and drive programming. The article also studied medical theory of bone structure, mensuration technology of bone density and the principle of DEXA for the ...学位：工学硕士院系专业：物理与机电工程学院机电工程系_测试计量技术及仪器学号：20022900
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
- …
