1,720,969 research outputs found

    Change in deformation pattern on the Hengchun peninsula after 2006 Pingtung earthquake doublet and activity of the Hengchun fault

    No full text
    臺灣位於菲律賓海板塊及歐亞板塊之間,為活躍的弧陸碰撞帶,活動構造引起的災害性地震可能危及許多重大建設。例如位於本研究區域的核能第三發電廠鄰近位於恆春半島的恆春斷層。因此,了解恆春斷層的活動性和孕震潛能即是重要的防災評估議題。前人藉由精密水準測量的研究中發現,恆春半島的垂直抬升速率在2006/12/26屏東外海地震之後有明顯的改變,跨斷層速率增加至原本的2-3倍,且改變的抬升形貌持續約3-6年。為確認2006屏東外海地震和地表抬升速率改變之間存在觸發關係的假設,本研究利用庫侖靜態應力轉移模型,得出恆春斷層位於靜態應力增加的區域,增加值約為0.2-0.6 bar,驗證觸發關係的假設。本研究進一步使用Okada (1985)彈性半無限空間錯位模型,以正演方式搜尋得不同時段,斷層參數及斷層面上的滑移量,求取地表模擬變形與觀測值的最佳擬合。另外,為補足精密水準與GPS觀測在研究區空間上分布之不足,本研究使用時間段分別為1996-2000年ERS (C波段)和2006-2010年ALOS(L波段)衛載的SAR影像,以PS-InSAR技術分析兩時段內的恆春區域地殼變形形貌,並沿恆春斷層走向由北至南切出六個視衛星方向變形剖面,分析此變形剖面與已知活動構造的關聯性,發現恆春半島的地表變形除了恆春斷層的活動與恆春西台地持續西傾的影響之外,在恆春西台地與恆春谷地之間有一圓穹狀突起,與地質調查結果相比較,可以發現正好對應於泥灌入體分布的範圍,推測為泥灌入體所致。因此PS-InSAR所呈現的結果,提供泥岩貫入作用亦在恆春半島地表變形扮演重要的角色。Taiwan is situated in the active arc–continent collision region between the Philippine Sea plate and Eurasia plate. The destructive earthquakes induced from active structures could poses threats on infrastructures such as the 3rd Nuclear Power plant, which is seated close to the Hengchun fault in Hengchun Peninsula, southernmost of Taiwan. Thus, understanding the activity of the Hengchun fault and seismogenic potential is a crucial topic on assessment of the seismic hazards. On the decadal time scale geodetic observation, previous studies suggested that the surface uplift rate on Hengchun peninsula based on leveling measurements was changed significantly after the 26th December 2006 Pingtung offshore earthquake doublet.The uplift rate across the Hengchun fault can be 2-3 times than the original rate. Furthermore, the changed slip pattern lasted for 3-6 years. In order to verify the hypothesis of triggering relationship between 2006 Pingtung earthquake doublet and the influence on crustal deformation in the surrounding fault systems, we adopt Coulomb static stress change model to characterize the deformation occurred on the Hengchun fault. The results indicate Hengchun fault fall in the stress increasing zone, providing a plausible evidence for the hypothesis of static stress transfer. Furthermore, the elastic half-space dislocation model is used to forward slip distribution on the Hengchun fault and find the best-fit fault parameter as well as the slip distribution on the fault patches associated with the surface deformation. Moreover, in this study, we attempt to apply ERS (C-band) and ALOS (L-band) satellite-based Persistent Scatterers SAR Interferometry (PS-InSAR), in the duration of the 1996-2000 and 2006-2010 respectively, to detect regional crustal deformation patterns. Six profiles perpendicular to the Hengchun fault are made to analyze the relationship between deformation and active structures. A dome-shaped deformation pattern between western Hengchun fault and Hengchun Valley is coincide with the mud diaper inferred from geological survey and seismic profile. The results suggest that the mud diapirism should play an important role on the deformation on Hengchun Peninsula

    Going Beyond Counting First Authors in Author Co-citation Analysis

    Get PDF
    The 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 PDF
    We 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 PDF
    We 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

    Author Index

    No full text
    Nao informado

    koamabayili/VECTRON-author-checklist: VECTRON author checklist

    No full text
    We 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
    corecore