1,721,074 research outputs found
Research on Phosphorus Removal from Silicon by Induction Vacuum Refining and Its Thermodynamics-kinetics Mechanism
Get PDF太阳能是一种巨大且对环境无污染的可再生能源，而直接将太阳能转化为电能的光伏技术将是未来人类利用太阳能最直接且最经济的方式。当前，能源与环境问题使得太阳能光伏成为世界各国的研究热点。 硅是制备太阳能电池的主要原材料之一，是全球半导体工业及光伏产业的基石。冶金法提纯太阳能级多晶硅，相对于化学法（如改良西门子法、硅烷法等）来说，具有低成本、低能耗、环境污染小、安全性高等优点，已得到世界各国广泛的认同与推崇。 磷作为硅的施主杂质，在太阳能电池基体中，其含量不得高于0.1ppmw。由于磷具有很高的分凝系数(0.35)，因此很难用定向凝固的方法去除。目前采用冶金法除磷的工艺主要包括酸洗工艺、合金定向凝...Solar energy is a huge clean sustainable energy resource. Photovoltaic technology can transfer solar energy to electricity directly, which will become the most direct and most economy way for human in using solar energy in the future. At present, PV technology has already been a research hot topic due to the energy crisis and environment issues. Silicon is one of the main materials for solar cell...学位：工学博士院系专业：材料学院材料科学与工程系_材料物理与化学学号：2072008015000
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
Ultra-high temperature phase change materials for latent heat storage
No full textPresentation at the First International Workshop on Ultra High Temperature Thermal Energy Storage, Transfer, and Conversion (UHTES), 14-15 Nov. 2019 (Madrid, Spain).</p
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
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