1,721,084 research outputs found
Analysis on natural characteristics of four-stage main transmission system in three-engine helicopter
No full textThe vibration model of four-stage main transmission system in helicopter was established through lumped mass method. In the model, many factors, including time-varying meshing stiffness and torsional stiffness of gear shaft were considered. The differential equation of the system was solved via Fourier method, and the influence of the torsional stiffness of shafts on the first five orders of the system’s natural frequency was studied. Some theoretical results were summarized as guidelines for further research and design of four-stage deceleration helicopter at last.<br/
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
Influence of shaft torsional stiffness on natural characteristics of four-stage main transmission system in three-engine helicopter
No full textFour-stage main helicopter transmission system occupies several strong points like good carrying capacity and is addressed by many scholars. However, the influence of variable parameters on natural characteristics in a three-engine helicopter, is not to be investigated, according to the limited published issues. Thus, in the study, a vibration model of the four-stage main helicopter transmission system is established through the lumped mass method. In the model, many factors, including time-varying meshing stiffness and torsional stiffness of gear shaft are considered. The differential equation of the system is solved via the Fourier method, 27-orders natural frequency and modal shape corresponded by each degree of freedom (DOF) of the system are obtained. The influence of the shaft torsional stiffness on the first five orders of the system natural frequency is studied. Besides, the impact of the matching relationship of key shafts’ torsional stiffness on the system stability is analyzed. These contributions would improve modification developments of four-stage deceleration helicopter in future.</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
The Impact of Audit Committee, Compensation Committee, and Other Directors’ Equity-Based Compensation on Earnings Management
No full text本研究旨在探討董事會成員股權基礎給付之薪酬與盈餘管理的關聯。過去研 究發現高階經理人因股權基礎給付薪酬所形成的權益誘因,會提高公司盈餘管理 之情況;權益誘因若作用於獨立董事身上,則會與盈餘管理程度呈反向關係。配 合董事會結構的強化,本研究不僅將董事樣本劃分為審計委員會成員、薪酬委員 會成員、以及其他董事會成員三個群組,更將衡量董事之權益誘因分別以權益薪 酬總金額和權益薪酬占總薪酬之比例代理,且以裁決性應計數衡量公司盈餘管理 程度,結果顯示審計委員會、其他董事會成員、以及以權益薪酬比例衡量之薪酬 委員會,其權益誘因與下年度盈餘管理程度呈反向關係。本文再進一步將權益薪 酬拆分成選擇權型與股票型,發現僅選擇權型在三個群組樣本內皆與盈餘管理程 度呈負向相關,而股票型薪酬與盈餘管理之負相關只存在於審計委員會。最後, 再將選擇權型與股票型薪酬各劃分成獨立董事與內部董事兩組,發現獨立董事之 選擇權型薪酬在各群組皆與盈餘管理程度有負向相關,股票型僅在審計及薪酬委 員會身上與盈餘管理程度有負向相關。本研究之穩健性測試係將兼任審計與薪酬 委員會的董事成員剔除,藉以消彌其對本研究回歸式之影響,結果顯示回歸式的 結論與原來的差異不大。In this paper, I examine how directors’ equity-based compensation affects earnings management by decomposing directors into audit committee, compensation committee, and other members of the board, who are not in the audit or compensation committees. Initially, I respectively test the relationship between income-increasing earnings management, measuring by discretionary accruals, and equity incentives of the three directors’ groups. The result suggests that there is a significant negative relation between income-increasing earnings management and equity incentives of three sample groups measured by ratio of equity compensation to total compensation. However, when equity compensation amount measure is used, the relation only exists in audit committee and other members of the board. Next, I decompose the equity-based compensation into options and stocks. A negative relation is found between options compensation of three sample groups and income-increasing earnings management. On the other hand, the unfavorable effect on the relation between stock compensation and income-increasing earnings management only exists in audit committee. Lastly, I separate compensation into independent and inside directors, finding that inside directors do not maintain the unfavorable effect on the relation between compensation and income-increasing earnings management. Regarding independent directors, the option compensation of three sample groups are negatively associated with income-increasing earnings management. Nevertheless, as for the stock compensation, the unfavorable effect is observed only in audit and compensation committee. As a robustness test, I eliminate the impact of overlapping membership on audit and compensation committees. The results are unaffected by the elimination of overlapping membership on audit and compensation committees
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
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