1,720,965 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
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
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
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
방사형 익스팬더 VGN 노즐의 멀티-캐비티 팁 누설 유동 저감 효과
Full text link학위논문(석사) -- 서울대학교대학원 : 공과대학 기계공학부, 2022. 8. 송성진.A numerical research has been conducted for a radial expander with Variable Geometric Nozzle (VGN) to analyze its tip leakage flow rate using CFD.
The tip discharge coefficients are calculated for the flat tips, the squealer tips, and the cavity tips to choose a design factor that has the smallest discharge coefficient. The cavity tip is selected and applied to the VGN of the radial expander as a design factor to reduce its tip leakage flow rate.
The tip leakage flow rates along the pressure side, the suction side, and the leading edge side are numerically calculated compared to the flat tip. Their flow mechanism is investigated depending on the streamwise location.
VGN blade with the cavity tip applied had little labyrinth seal effect due to the blade thickness and non-rotation characteristic of the nozzle blade, and there was little change in the tip leakage flow rate. Thus, the multi-cavity tip idea, a new shape to complement the thick blade thickness, was devised and applied to VGN. VGN blade with the multi-cavity tip had a partially reduced leakage flow rate on the pressure side compared to the flat tip, and the size of the leakage flow vortex was increased and reduced the bulk flow angle of the VGN outlet.
Numerical calculations indicated that applying the multi-cavity tip to the VGN blade increased the aerodynamic efficiency by 1.25%p due to the reduction of the leakage flow rate at the pressure side and reduced flow angle of the VGN outlet.익스팬더는 가스를 팽창시켜 에너지를 얻는 터보 기계로, 천연가스 운송기지에서 전기에너지를 회수하는 것과 같이 산업현장에서 다양한 목적으로 사용되고 있다. 특히 방사형 익스팬더 관련 고객의 주 요구조건은 높은 성능과 넓은 운전범위, 작은 사이즈이다. 방사형 익스팬더의 유량 제어방법은 Inlet Throttle Valve (ITV)와 Variable Geometric Nozzle (VGN) 로 분류할 수 있는데, VGN은 ITV와 달리 익스팬더 노즐의 각도를 조절하여 노즐 출구부 속도 방향 조절을 통해 유량을 제어한다. ITV는 제작된 설계점에서의 공력성능은 높으나 탈설계점에서의 성능이 감소하고 이에 따라 운전 범위가 좁은 특징이 있다. 반면 VGN은 설계점에서의 성능은 상대적으로 낮으나, 탈설계점에서의 성능저하가 작고 넓은 운전범위를 확보할 수 있다. 따라서, 고객의 요구조건 만족을 위해 VGN의 사용이 선호된다.
그러나 노즐 각도 조절이 가능한 VGN의 특성 상, 노즐과 캐이싱 사이의 간극이 필수적으로 존재한다. 노즐에서 이러한 팁과 허브의 간극을 통해 누설 유동이 발생하며 이는 무시할 수 없는 크기의 공력 손실을 야기한다. 방사형 익스팬더의 경우 역시 공력성능 향상 및 제품 경쟁력 향상을 위해, VGN의 간극을 통한 누설 유동 손실을 최소화할 필요가 있다.
본 연구에서는 문헌 조사를 통해 VGN 간극이 공력 손실에 미치는 영향 및 설계요소가 미치는 영향에 대해 파악하고, 팁 간극의 누설 유동 저감을 위해 기존에 선행된 연구 사례들을 분석하고자 한다. 이후 문헌 조사를 바탕으로 기존 형상과 조건에 적용할 수 있는 설계 인자를 선정하고 CFD 유동 해석 방법을 정립한다. 설계 인자를 적용한 case study를 진행하여, 설계 변수들이 설계점에서 VGN 공력성능에 미치는 영향을 파악하고 분석한다. 최종적으로 방사형 익스팬더의 VGN 누설 유동으로 인한 공력 손실을 최소화하는 것을 목표로 한다.Abstract 1
Table of Contents 3
List of Tables 5
List of Figures 6
Chapter 1. Introduction 8
1.1 Reserch Background 8
1.2 Thesis Aims 8
Chapter 2. Literature Review 9
2.1 Radial Expander 9
2.2 Tip Leakage Flow in Turbine 9
2.3 Tip Leakage Flow Reduction 11
2.3.1 Mechanism of Tip Leakage Flow 11
2.3.2 Axial Turbine Tip Leakage Flow Reduction 13
2.3.3 Radial Turbine Tip Leakage Flow Reduction 17
Chapter 3. Modelling Analysis and Selection of Tip Design 18
Chapter 4. Computational Setup 21
4.1 Numerical Method 21
4.2 Computational Domain 21
4.3 Boundary Conditions 23
4.4 Convergence Method 23
4.5 Mesh 24
4.5.1 CFX Grid Generation Method 24
4.5.2 Grid Types 25
4.5.3 Mesh Characteristics and Generation 26
4.5.4 Mesh Independence Test 27
Chapter 5. Tip Design Applications and Discussion 29
5.1 Flat tip 29
5.1.1 Tip Leakage Flow Rate Calculation 31
5.2 Cavity Tip Application 32
5.2.1 Single Cavity Tip 32
5.2.2 Multi-Cavity Tip 38
5.2.3 The Leakage Flow of Multi-Cavity Tip 40
5.3 Leading Edge Blocking Tip 42
Chapter 6. Additional Tip Designs 47
6.1 Winglet Tip 47
6.2 Cavity-Winglet Tip 48
6.3 Tip Roughness 49
Chapter 7. Conclusions 53석
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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