1,721,087 research outputs found
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
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
Geological setting, nature of ore fluids and sulphur isotope geochemistry of the Fu Ning Carlin-type gold deposits, Yunnan Province, China
No full textCarlin-type gold deposits in southern China are present in Palaeozoic to Mesozoic siliciclastic and carbonate rocks. The border region of Yunnan, Guizhou and Guangxi Provinces contains gold deposits on the south-western margin of the Pre-Cambrian South China Craton in south-eastern Yunnan Province. The Fu Ning gold deposits host epigenetic, micron-sized disseminated gold in: (i) Middle Devonian (D1p) black carbonaceous mudstone at the Kuzhubao gold deposit and (ii) fault breccia zones at the contact between Triassic gabbro (βμ51) and the Devonian mudstone (D1p) at the Bashishan gold deposit. The deposits are associated with zones of intense deformation with enhanced permeability and porosity that focused hydrothermal fluid flow, especially where low-angle N-S striking thrust faults are cut by NW striking strike-slip and/or NE striking normal faults. Major sulphide ore minerals in the Fu Ning gold deposits are pyrite, arsenopyrite, arsenic-rich pyrite, stibnite and minor iron-poor sphalerite. Gangue minerals are quartz, sericite, calcite, ankerite and chlorite. Hypogene ore grades range from 1 to 7 gt-1 Au and up to 18 gt-1 Au at the Kuzhubao gold deposit and are generally less than 3 gt-1 Au at the Bashishan gold deposit. Sub-microscopic gold mineralization is associated with finely disseminated arsenic-rich pyrite in the Stage III mineral assemblage. Two types of primary fluid inclusions have been recorded: Type I liquid-vapour inclusions with moderate-to-high liquid/vapour ratios, and Type II inclusions containing moderate liquid/vapour ratios with CO2 as determined from laser Raman analysis. Temperature of homogenization (Th) data collected from these primary fluid inclusions in gold-ore Stage III quartz ranged from 180 to 275°C at the Kuzhubao gold deposit and 210 to 330°C at the Bashishan gold deposit. Salinity results indicate that there were possibly two fluids present during gold deposition, including: (i) an early fluid with 0.8-6.5 wt.% NaCl equivalent, similar to salinity in shear-zone-hosted gold deposits with metamorphic derived fluids; and (ii) a late fluid with 11.8-13.4 wt.% NaCl equivalent, indicating possible derivation from connate waters and/or brine sources. CO2 and trace CH4 were only detected by laser Raman spectrometry in gold-ore-stage primary fluid inclusions. Results of sulphur isotope studies showed that δ34S values for pyrite and arsenopyrite associated with gold-ore mineralization during Stage III at the Kuzhubao and Bashishan gold deposits are isotopically similar and moderately heavy with a range from +9 to +15 per mil, and also fall into the range of δ34S values reported for Carlin-type gold deposits. Sulphur isotopes suggest that the Fu Ning gold deposits were formed from connate waters and/or basinal brines. Fluid geochemistry data from the Fu Ning gold deposits suggest a Carlin-type genetic model, involving fluid mixing between: (i) deep CO2-rich metamorphic fluids, (ii) moderately saline, reduced connate waters and/or basinal brines; and (iii) evolved meteoric waters
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
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
STOCHASTIC MODELING OF BEDLOAD TRANSPORT BY THE CONTINUOUS-TIME MARKOV CHAIN PROCESS
No full text為描述泥沙運動過程的間歇性特點，本研究應用序率方法，致力提出一周全的馬可夫鏈模式，以模擬水流中複雜的泥沙交換過程。我們著重於二部份，一為連續時間馬可夫鏈的應用，另一為三個狀態輸砂模式的建立。連續時間的馬可夫鏈能展現泥沙運動連續發生之行為過程，為確立連續時間馬可夫鏈應用於泥沙交換問題的數學處理方式，首先以一具兩個狀態的馬可夫鏈模擬泥沙起動過程，釐清連續時間馬可夫鏈之混淆定義；隨後，延續所確立之連續時間馬可夫鏈，提出三個狀態、連續時間之馬可夫輸砂模式，以描述泥沙運動中靜止、推移和懸移的三種狀態，由於一般推移質輸砂模式只考慮底床之泥沙交換，忽略懸移質對推移質輸砂量可能之影響，本研究增加懸移質之考慮，描述水流底部泥沙在三種不同狀態下交換之完整過程，進而發展一更準確之推移質輸砂模式。此連續時間、三個狀態之馬可夫鏈輸砂模式中，因其連續時間馬可夫鏈的應用，能夠求得狀態轉移機率對時間的函數之解析解，故不僅能推算達穩定平衡之推移質輸砂率，亦能求得達穩定狀態之前隨時間變換之輸砂率；另外，三個狀態之輸砂模式能夠表示一河段受推移質或懸移質的支配情形，以及三狀態泥沙的數量分佈。針對所提出的推移質輸砂模式所作分析驗證，其結果證明了此模式具有一定程度的有效性。Based on the stochastic approach, a comprehensive Markov chain model for the sediment interchange process is performed in this study. The continuous-time Markov process is appropriate for describing the continuous behavior of particle movement under steady flow conditions. A certain mathematical formulation in employing the continuous-time Markov process is constructed by the presentation of a two-state Markov model for sediment entrainment. Then we accordingly propose a three-state continuous-time Markov model that completely simulates sediment exchange and thus can quantify the bedload transport rate more accurately. The three-state Markov model describes the particle movement across three motion states, i.e. bed material, bedload, and suspended load. We have added a third state to account for the influence of suspended load, which is different from general bedload transport studies. With the employment of the continuous-time Markov model, the bedload transport capacity in the long run and the varying transport rates with time before the steady state can be derived. On the other hand, the three-state model exhibits that the flow is subject to the bedload or suspended load and further the actual sediment distribution in three motion states. The proposed model is validated against the natural river data. The comparison has shown a reasonably good agreement and thus the validity is confirmed to some extent
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
