1,720,958 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
Desain Perancangan Mesin Pemarut Kelapa Dengan Pengaman Sistem Tuas Mekanis
Get PDFTumbuhan kelapa memiliki banyak manfaat dan juga memiliki nilai jual yang cukup tinggi. Seiring perkembangan zaman, banyak alat-alat inovasi yang berfungsi untuk mempermudah kerja manusia. Penelitian ini akan merancang sebuah mesin pemarut kelapa dengan pengaman sistem tuas mekanis. Metode penelitian ini menggunakan metode permodelan menggunakan software solidworks 2020 dan melakukan perhitungan yang bertujuan untuk mengetahui hasil perhitungan rancangan. Penelitian ini menghasilkan sebuah desain alat pemarut kelapa dengan hasil rangka mesin pemarut kelapa memiliki dimensi ukuran panjang 400 mm, lebar 300 mm, dan tinggi 610 mm. Pisau parut dengan ukuran diameter 76 mm dan memiliki jarak 6 mm pada masing-masing mata parut. Alat ini menggunakan motor listrik dengan daya 0,5 hp. Alat ini menggunakan puli penggerak 2 inch dan puli yang digerakkan 4 inch dengan putaran output 700 rpm. Material yang digunakan pada rangka mesin pemarut kelapa ini menggunakan besi siku sama sisi dengan profil ukuran 30 x 30 x 3 mm yang diberikan pembebanan sebesar 324 N. Dari hasil simulasi mendapatkan nilai von mises stress maksimum sebesar 165,19 MPa, deformasi sebesar 0,963 mm dan nilai safety factor sebesar 1,5
ANALYSIS OF CAVITATION LEVEL IN WADASLINTANG HYDROPOWER PLANT USING THOMA CAVITATION FACTOR
No full textTurbine damage can be caused by several causes, including damage to the turbine due to cavitation on the surface of its blades. Miscalculation of the position or location of the turbine can occur and will result in this cavitation. The Thoma cavitation factor is used to determine whether the turbine operation is safe from cavitation. This research was conducted at the Wadaslintang Hydroelectric Power Plant. The research used a quantitative descriptive research method. This study aims to determine the level of cavitation that occurs in the Francis turbine at an actual reservoir elevation of 169.23 meters above sea level with maximum guide vane openings to minimum guide vane openings. At variations in guide vane openings of 100% and 80% cavitation occurs, while at guide vane openings of 76%, 60%, 40%, and 20% cavitation does not occur. The larger the guide vane opening, the cavitation level is in a more dangerous condition because the difference between the cavitation factor and the critical cavitation factor is smaller, with the difference values ​​of 1.285073, 1.023435, 0.970782, 0.763080, 0.506127, and 0.253081, respectively. The smaller the guide vane opening, the smaller the risk of cavitation, but the power generated is also smaller. Safe operating conditions from cavitation with the greatest power are found at a guide vane opening of 76%-80%.
Keywords: francis turbine, guide vane, cavitation, thoma cavitation factor
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
Analisis Kekuatan Rangka Pada Mesin Pemotong Kentang Dengan Mata Pisau Berbentuk Silinder
Get PDFPada proses pembuatan kentang goreng biasanya dikerjakan secara manual, hal tersebutlah yang menjadi kendala produksi jika kapasitasnya menjadi banyak dan membutuhkan waktu yang lebih lama. Dari permasalahan tersebut memerlukan mesin pemotong kentang secara otomatis agar proses pemotongan lebih maksimal. Pada mesin pemotong kentang, rangka merupakan komponen utama maka dari itu rangka harus memiliki kriteria yang baik, dari permasalahan tersebut perlunya analisis pada rangka agar mesin pemotong kentang bekerja secara baik. Tujuan penelitian ini yaitu untuk mengetahui nilai dari analisis statis dan analisis dinamis dari rangka mesin pemotong kentang. Jenis besi yang digunakan yaitu baja profil L 30 x 30 mm dan tebal 2 mm dengan jenis material ASTM A36. Dengan pemberian beban total yang diberikan sebesar 13.601 Newton diharapkan mampu menopang kinerja mesin selama penggunaan. Hasil simulasi menggunakan software Ansys Workbench yaitu menghasilkan nilai displacement sebesar 7.0621e-003 mm, simulasi regangan menghasilkan nilai maksimal sebesar 7.0875e-006 mm/mm, safety factor pada rangka mesin pemotong kentang nilainya masih dalam range nilai aman, von mises stress menghasilkan nilai sebesar 1.2273 MPa dan nilainya masih dibawah nilai yield strength sebesar 250 Mpa, artinya ini aman digunakan selama penggunaan. Simulasi modal yang penghitungan frekuensi manual yang menghasilkan nilai 11.66 Hz, hal ini dinilai aman dikarenakan nilai tersebut jauh dari nilai pada simulasi yang menghasilkan minimal 230.23 Hz dan maksimal 431.4 Hz. Hasil dari simulasi respon harmoni menghasilkan amplitude paling besar 3.0516e-005 dan paling kecil 0.4976 mm. Dari hasil simulasi tersebut, maka rangka dinyatakan aman dan dapat digunakan
Evaluasi Jenis Elektroda SMAW Terhadap Kekuatan Sambungan Pipa Baja ASTM A106 Grade B
Get PDFTeknologi pengelasan logam digunakan sat ini sudah dapat menyambungkan dua jenis logam yang berbeda. Pengelasan tersebut masih sering dijumpai cacat las, permasalahan yang sering dihadapi adalah perbedaan titik lebur, koefisien muai, sifat fisis dan mekanis. Maka dilakukan penelitian untuk mengetahui pengaruh variasi jenis elektroda antara baja karbon rendah ASTM 106 gr B terhadap sifat mekanis dan fisisnya. Metode penelitian ini menggunakan eksperimental, pengelasan SMAW variasi jenis elektroda E7016 dan E7018. Hasil penelitian ini menunjukkan bahwa jenis elektroda berpengaruh terhadap kekuatan tarik, kekerasan, dan strüktur mikro. Kekuatan tarik tertinggi sebesar 561,5 MPa dengan regangan 16,67 % dan modulus elastisitasnya 3387 Mpa. Hasil uji penetran menunjukkan spesimen dengan variasi elektroda E7016 memiliki cacat las yang lebih kecil. Hasil uji struktur mikro menunjukkan unsur fasa yang terbentuk pada E7018 yaitu ferrite dan perlite yang lebih merata
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
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