1,720,968 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
Penyelesaian Numeris Berbasis Pemprograman
Full text linkPada perinsipnya problem-problem matematika dalam teknik sedapat mungkin diselesaikan secara analitis, sebab sifatnya exact memberi hasil hitungan dengan ketelitian mencapai 100%. Namun penyelesaian analitis memiliki kelemahan, yaitu terbatas pada problem-problem sederhana, sementara dalam bidang teknik termasuk teknik kimia, lebih sering dihadapkan pada problem yang lebih kompleks. Pada kondisi seperti ini maka penyelesaian numeris menjadi alternatif. Dalam penyelesaian numeris ada yang sifatnya adalah coba-coba (trial and error) yang menimbulkan persoalan baru sebab membutuhkan sederetan hitungan yang panjang dan berulang-ulang, sehingga cukup melelahkan jika dihitung secara manual. Persoalan ini dapat diatasi dengan bantuan pemrograman komputer. Dalam makalah ini disajikan dua buah contoh kasus, yang pertama evaluasi kinetika reaksi kompleks polimerisasi urea formaldehid dengan program bahasa QBASIQ dan yang kedua adalah penentuan tetapan kesetimbangan untuk meramalkan komposisi gas hasil pada proses gasifikasi arang batubara dengan menggunakan program MATLAB
KARAKTERISTIK BIOBRIKET DARI CAMPURAN BATUBARA – ARANG TEMPURUNG KELAPA
Full text linkPenggunaan bahan bakar padat seperti briket dari batubara atau campuran batubara-biomassasebagai sumber energi alternatif masih tergolong kecil dibandingkan sumber energi lain sepertiminyak dan gas bumi. Salah satu kekurangan dari briket ini adalah sulit terbakar pada awalpembakaran selain itu kandungan sulfur batubara Sulawesi Selatan tergolong tinggi sehingga dapatmenimbulkan emisi gas SO2 . Salah satu cara untuk mengatasi masalah tersebut adalah mencampurbatubara dengan arang tempurung kelapa dengan rasio tertentu, pati sebagai perekat dan air Kemudian dicetak dan dikeringkan. Dalam penelitian ini, kondisi optimum diperoleh pada komposisicampuran batubara 20 %, arang tempurung kelapa 80%, memberikan karakteristik biobriket yaitu daya tekan 250 kg/cm,nilai kalori 6493.69 kkal/kg, sedangkan emisi gas hasilpembakaran SO2 103 ppm, NOx 3 ppm dan CO2 0,4%.Kata kunci: Batubara , Biobriket, , Biomassa., Karakteristi
Pemodelan Matematis Reaksi Oksidasi Katalitik Fero Sulfat Menjadi Feri Sulfat
Full text linkLarutan fero sulfat (FeSO4) dibuat dengan melarutkan besi ke dalam asam sulfat. Fero sulfat dioksidasi memakai katalisator mangaan dioksid untuk membentuk feri sulfat. Reaksi merupakan reaksi heterogen tiga fasa sehingga kinetika reaksinya cukup komplek. Penelitian ini bertujuan mengembangkan model matematis pada kinetika reaksi tiga fase. Reaksi djalankan pada kondisi isotermal dan isobarik pada rekator yang berupa labu leher tiga. Percobaan dilakukan pada suhu 323K sampai 353K dan konsentrasi katalisator 1,7 g/L. Hasil penelitian menunjukan bahwa kinetika reaksi dapat didekati dengan model quasi steady state dan rekasi kimia pada permukaan katalisator merupakan langkah yang menentukan kinetika reaksi.
Kata kunci: pemodelan matematis, kinetika, langkah penentu
Iron was dissolved in a sulfuric acid to form a concentrated ferrous sulphate (FeSO4) solution. This research was conducted to form ferric sulfate by catalytic oxidation of ferrous sulfate using manganese dioxide as catalyst. The system was a three-phase heterogeneous reaction with a quite complex kinetics The present study aimed at developing a mathematical modeling of three-phase reaction kinetics that involved gas, liquid and solid. Oxidation was undertaken in an isothermal isobaric condition in a three-neck flask reactor. The experiment was conducted in a temperature range of 323 to 353 K with a catalyst concentration of 1.7 g/L. The results indicated that the reaction kinetics could be approached with a quasi steady state model and the chemical reaction on the catalyst surface was the determining step.
Key words: mathematical modeling, kinetics, determining ste
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