1,721,024 research outputs found
Effects of Molding Parameter and Binder Design on Gate Mark of MIM Components
No full text金屬射出成形製程的第一個步驟是先將金屬粉末與黏結劑混合，但是若在混合製程或射出製程產生粉膠不均勻的現象，將會使生胚產生缺陷，並在溶劑脫脂、熱脫脂與燒結階段陸續出現問題，其中一個缺陷在生胚澆口表面形成一個較為顏色暗沉的區塊，稱之為蠟痕，主要原因是產生粉膠分離現象，使得此處的黏結劑較其他地方來得多，所以在溶劑脫脂後會下陷而且較為脆弱，此將影響試片的美觀以及性質，故本論文致力於解決此問題。
為了解決粉膠分離現象，本研究以生胚上的蠟痕作為觀察標準，一開始先探討射出參數的調整對蠟痕的影響，發現升高射出溫度、降低射速、降低保壓壓力與提高模子溫度都有助於減小蠟痕。對於鐵粉系統，更換不同的骨架黏結劑如PP(3554)和Fusabond都有助於使蠟痕變小，其中Fusabond系統也可使生胚強度升高並減少生胚在溶劑脫脂時的膨潤現象。熱重分析儀、接觸角與毛細力實驗均證明了更換此兩種骨架黏結劑可讓其與粉末間之匹配性更好，消弭粉膠分離現象。在添加偶合劑方面，加入EVA、1209AC或Exxelor於射料中，有助於生胚強度的提升，但無助於蠟痕問題之解決。在316L不?袗?粉方面，當不?袗?粉與PP(3554)和Fusabond這兩種骨架黏結劑混煉時會呈水狀，不利於射出成形，故必須降低黏結劑的含量，提高射料的黏度以便射出成形
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
Using an integrated model to track the fate and transport of suspended solids and heavy metals in the tidal wetlands
No full textAuthor-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
