1,727,230 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Supplemental material for Obstructive sleep apnea and risk of aortic dissection: A meta-analysis of observational studies
No full textSupplemental material for Obstructive sleep apnea and risk of aortic dissection: A meta-analysis of observational studies by Xiushi Zhou, Fei Liu, Wei Zhang, Guili Wang, Daqiao Guo, Weiguo Fu and Lixin Wang in Vascular</p
Variations on the Author
Full text link“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
Full text linkWe 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
FIGURE 2 in Exostoma tibetana, a new glyptosternine catfish from the lower Yarlung Tsangpo River drainage in southeastern Tibet, China (Siluriformes: Sisoridae)
No full textFIGURE 2. Exotoma tibetana, holotype, IHB 20161046, 76.2 mm SL; China: Tibet: a mountain stream of the lower Yarlung Tsangpo River; dorsal and ventral views of head.Published as part of Gong, Zheng, Lin, Pengcheng, Liu, Fei & Liu, Huanzhang, 2018, Exostoma tibetana, a new glyptosternine catfish from the lower Yarlung Tsangpo River drainage in southeastern Tibet, China (Siluriformes: Sisoridae), pp. 392-402 in Zootaxa 4527 (3) on page 395, DOI: 10.11646/zootaxa.4527.3.8, http://zenodo.org/record/261235
Effects of Drought and Salt Stress on Rice Production
No full text影響水稻產量的關鍵大致可歸納於：提高單位面積產量與擴展栽培面積。自綠色革命以來，水稻單位面積產量的變化已逐漸達到平峰，短期內難以突破，而地表仍有大面積土地，具有乾旱與鹽害問題。若能改進水稻耐旱耐鹽能力，則可利用這些土地生產，以增加水稻產量。缺水下水稻植株易表現出葉片捲曲、氣孔關閉等現象，而長期的鹽分處理則會造成，Na在葉片中累積，抑制光合作用，並加速葉片老化。水稻在生殖生長期對乾早與鹽分最為敏感，這些逆境均會傷害穗的發育，進而影響到開花與稔實率，降低總產量。水稻各品種耐鹽耐旱能力不同，抵抗這些逆境的機制可歸納為：（一）調整生育時期以逃避乾早。（二）改變植物體結構，提高用水效率。（三）調節細胞內滲透壓。（四）有效解除離子毒害。這些抗性的機制是透過多基因的作用，並參與複雜的生理反應，故以過去的育種方法所得成果有限。現在可以利用分子生物技術，建立基因輿圖，定位出與耐旱耐鹽有關的量性狀基因座，則可望突破這些限制。近年來也有不少研究，以粒子槍射擊法或農桿菌汰等基因轉殖技術，獲得高效率的轉植水稻。期望能將陸續發現的耐旱耐鹽基因轉入水稻中，以增強水稻的抗逆境能力。
Drought and salt stress are two major constraints to rice production and yield stability in many regions on earth. In general, rolled leaves and closed stomata were easily found under drought stress. Accumulation of Na, decreasing of photosynthesis and enhancing of senescence were also found when plants were subjected to salt stress. Rice plant is most sensitive to both stress during reproductive stage. Loss of grain set and yield is tightly associated with the failure of panicle to exsert from the flag leaf, the reduced floret number and the lower pollen fertility. Several drought / salt-resistance mechanisms have been identified for rice: (1) drought escape via appropriate phenology, (2) moderated water-use through morphological changes, (3) the capacity for osmotic adjustment, and (4) efficiently devoid the ion toxicity. In the past, the breeding for both stress tolerance was slowly progressed because the complexity and the involvement of multi genes in drought / salt-resistance. However, recent development of molecular linkage markers for root traits and osmotic adjustment as well as transgenic techniques offer new opportunities for drought I salt-resistance breeding
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
Supplemental Material, supporting_information - Flexible thermoelectric nanodevices based on three-dimensional networks of poly(3,4-ethylenedioxythiophene) nanowires and graphene
No full textSupplemental Material, supporting_information for Flexible thermoelectric nanodevices based on three-dimensional networks of poly(3,4-ethylenedioxythiophene) nanowires and graphene by Hai-Hui Liu, Meng-Qi Zhang, Zi-Han Tian, Peng-Fei Liu, Yan-Xin Liu and Xing-Xiang Zhang in High Performance Polymers</p
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