1,721,180 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
An analysis of the relationship between the transition zone chlorophyll front and the distribution of skipjack tuna of pole and line fishery in the central and western North Pacific using multi-sensor satellite remote sensing
No full text中西北太平洋海域之過渡區葉綠素鋒面(Transition Zone Chlorophyll Front ,TZCF)是海洋生物的重要棲息海域之ㄧ，表層洄游魚類均有聚集於此的現象，而TZCF的空間分布與時間變動特性，深深影響海洋生物的分布與海洋生態系統。由於TZCF有明顯表面聚合的情況，並且介於高葉綠素亞極區環流和低葉綠素亞熱帶環流之間，而對於觀測此一大範圍之海洋環境變動，衛星遙測可提供大範圍與即時觀測的優點，是研究此等海洋環境變動最佳的資料來源。本研究即利用衛星遙測所得之海面水溫、葉綠素濃度、海面高度距平值、渦漩動能等資料，以泛線性模式(GLM)及交叉相關分析探討上述之各種海洋環境因子與鰹竿釣漁業正鰹單位努力漁獲量之相關性。發現夏季有最高之生物生產力而此時TZCF與正鰹之位置皆在較北方。而此區之環境因子與正鰹之關係則皆為正相關，由環境因子推論大部分正鰹會出現在相對較於黑潮較低動能(600cm2s-2以下) 、相對較低海面水溫、急劇之葉綠素濃度梯度(0.05~0.3mg m-3)、海面高度距平值高之沿TZCF分布的渦漩區。結果顯示TZCF為數個環境因子在表層及次表層梯度急遽變動造成之鋒面，而環境因子深深影響正鰹之CPUE與其時空分布，因此顯現出TZCF對CPUE之影響。。本研究推估正鰹出現之最適環境海域，並不僅是以單一環境因子去預測環境變異對正鰹族群分布之影響，乃同時整合數個環境因子，一起描述正鰹棲息海域之狀況，進而預測分析正鰹之最適環境，預測之機率值越高，正鰹在此區之CPUE值也越高，以作為提供管理鰹竿釣漁業正鰹資源的科學性依據。摘要…………………………………………………………………I
前言…………………………………………………………………1
一、中西北太平洋鰹竿釣漁業概況………………………………1
二、正鰹之分布及生態……………………………………………2
三、中西北太平洋過渡區葉綠素鋒面……………………………2
四、過去學者之研究………………………………………………3
五、研究目的………………………………………………………4
材料與方法…………………………………………………………6
一、研究海域範圍…………………………………………………6
二、資料蒐集………………………………………………………6
三、漁海況資料分析………………………………………………8
四、正鰹棲息海域適合度指標分析………………………………12
結果…………………………………………………………………14
一、正鰹單位努力漁獲量及時空變動特性………………………14
二、海洋環境因子對正鰹CPUE時空分布之影響…………………14
三、西北太平洋過渡區葉綠素鋒面之時空分析…………………15
四、過渡區鋒面時空變動及正鰹單位努力漁獲量之關係………17
五、預測正鰹棲息海域分布範圍…………………………………18
討論…………………………………………………………………19
一、正鰹分布與海洋環境因子之關係……………………………19
二、過渡區葉綠素鋒面時空變動與海洋環境因子之關係………25
三、過渡區鋒面時空變動及正鰹單位努力漁獲量之關係………27
四、正鰹棲息海域分布預測模式…………………………………28
五、未來研究方向…………………………………………………29
結論…………………………………………………………………30
參考文獻……………………………………………………………31
附圖…………………………………………………………………37
附表…………………………………………………………………10
The photophysical properties of the complexes containing third-row transition-metal and their applications in OLEDs.
No full text本論文主要在探討含第三列過度元素‚OsII‚錯合物之光物理性質的研究. 由於它具有重元素(heavy atom ),因此可以增強它系統間跨越(intersystem crossing )的效率,使得原先spin-forbidden 的磷光得以產生. 並利用各種儀器的架設來偵測這些發光體在激發態的光物理現象. 也由於這些第三列過渡金屬錯合物它具有很高的發磷光效率,所以亦被應用於有激發光二極體上(organic light-emitting devices )
其內容主要分為六大章,第一章簡短的介紹關於有機發光二極體的歷史演進及其發光原理. 第二章則是實驗部分以及儀器架設的簡介. 第三章介紹中心金屬元素為Osmium(Os) 八面體的錯合物,由於在axial 的位置上有Iodide 取代,使得最低的激發態能階由原本典型metal-to-ligand (MLCT) 的transition 變成 mixed halide-to-ligand (XLCT~70%) 及 MLCT(~30%) 的transition.這種特性應用在OLED 上將增加其發光效率. 第四章及第五章介紹二價鋨金屬所形成之含2-吡啶吡唑族配基金屬錯合物的光物理性質‚藉由一些適當的且也系統的分子設計‚我們得到了藍色發光材料;最後,在第六章中,藉由加入離子而產生顏色上的變化,來當做metal ion phosphorescence probe.Recently, strong phosphorescent organometallic compounds have been intensively investigated because of their potential applications in organic light-emitting devices (OLEDs). These materials, such as square-planar d8 complexes of PtIII and AuIII and octahedral d6 complexes of ReI, OsII, IrIII, and PtIV ions, commonly exhibit super- or long excited-state lifetimes and high luminescence efficiencies. Spin-orbital coupling, which is enhanced by the presence of heavy-metal ions incorporated at the core of these complexes, results in highly efficient intersystem crossing, as well as the breakdown of the spin-forbidden nature of phosphorescence. In addition, the stronger ligand field strength expected for these third-low elements makes the metal-centered d-d transitions relatively inaccessible from the lowest emitting state, so that the competing radiationless deactivation process may no longer play a crucial role in quenching the emission. As a result, much stronger room-temperature phosphorescence is normally observed in both the liquid and solid state.
The aim of this article is to present some intriguing photophysical properties of a series of OsII complesex that have the potentials in the application of OLEDs.
This thesis is organized as follows: we start in chapter 1 with a short introduction and general review of organic light emitting devices. Some instrumental setup and the methods for experiment that are likely to encounter while going through the whole thesis are then briefly discussed in chapter 2. We then consider in more details some of the OsII complexes including their photophysical properties, ligand field strength, ligand orientation effects, and their application in the OLEDs.Abstract 1
Chapter 1.Introduction 2
1.1 The Structure of Molecular Light emitting diodes....2
1.2 A short historical note.............................2
1.3 Device Architecture.................................5
1.4 Energy transfer from a fluorescent dye to a
phosphorescence dopant..............................7
1.5 Elementary microscopic process......................9
1) Injection........................................9
2) Carrier extraction............................. .10
3) Carrier transport................................11
4) Carrier recombination............................12
5) Photon emission..................................12
1.6 Conclusion..........................................13
1.7 Reference...........................................14
Chapter 2. Experimental Section and instrumental setup 15
2.1 Introduction........................................15
Photophysical measurement.....................,,....15
Dynamic measurement.................................16
Quantum yield measurement...........................17
2.2 Figure..............................................18
Chapter 3. Photophysical Properties of Os(II) Diimine
Complexes [Os(N^N)(CO)2I2], NN =Bipyridine, 22
Phenanthroline and Pyridyl Benzoxazole
Abstract................................................23
3.1 Introductions.......................................24
3.2 Experimental Section................................25
Spectroscopic and dynamic measurements..............25
Computational methodology...........................26
3.3 Results and Discussions.............................26
Photophysical properties............................26
Electrochemistry....................................29
Theoretical approaches..............................29
Electroluminescence.................................30
3.4 Conclusion..........................................32
3.5 Tables and Figures..................................33
3.6 Reference...........................................43
Chapter 4. A Remarkable Ligand Orientational Effect
in Osmium-Atom-Induced Blue Phosphorescence 46
Abstract................................................47
4.1 Introductions.......................................48
4.2 Experimental Section................................50
Spectroscopic and dynamic measurements..............50
Computational methodology...........................51
4.3 Results and Discussions.............................51
Structural characterization.........................51
Photophysical and photochemical properties..........53
Discussion..........................................58
4.4 Conclusion..........................................61
4.5 Tables and Figures..................................63
4.6 Reference...........................................77
Chapter 5. Highly Efficient Red Phosphorescent Osmium(II)
Complexes for OLED Applications 88
Abstract................................................82
5.1 Introductions.......................................83
5.2 Results and Discussions.............................83
Structural Characterization.........................83
Photophysical properties............................84
O2 quenching experiments............................86
Electroluminescence.................................86
5.3 Conclusion..........................................87
5.4 Tables and Figures..................................89
5.5 Reference...........................................94
Chapter 6. Design and Synthesis of Ir(III)-Azacrown
Complex: Application as a Highly Sensitive 96
Metal Cation Phosphorescence Probe
Abstract................................................97
6.1 Introductions.......................................98
6.2 Results and Discussions.............................98
Experimental Section................................98
Computational Methodology...........................99
Absorption titration...............................100
Emission titration.................................102
Discussions........................................103
Photophysical properties...........................104
6.3 Discussions........................................107
6.4 Tables and Figures.................................108
6.5 Reference..........................................11
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
FIGURES 15–16. Ant. I–IV in Two new species of Lobellini from Central-South China (Collembola Neanuridae)
No full textFIGURES 15–16. Ant. I–IV: 15 Crossodonthina langshanensis sp. nov., 16 Lobellina gladius sp. nov.Published as part of Hu, Ya-Hui, Jiang, Cheng & Jiang, Ji-Gang, 2019, Two new species of Lobellini from Central-South China (Collembola Neanuridae), pp. 77-89 in Zootaxa 4712 (1) on page 86, DOI: 10.11646/zootaxa.4712.1.5, http://zenodo.org/record/358686
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