1,720,975 research outputs found
An experimental investigation of TiCN tool life and tool wear in turning of titanium / Muhamad Anwar Salehudin
Full text linkCoated cutting tools have been successfully used in the turning of Titanium Alloys. Since the demand of titanium is extremely high, many studies in machining, especially turning had been conducted. In this work, the tool life and tool wear of the coated cutting tool inserts using titanium carbon nitride (TiCN) is investigated in turning of titanium alloy under dry cutting condition. The study is focused on the machining parameters which are feed rate (/), cutting speed (TV) and the depth of cut (cl). Turning experiments were conducted at rotational cutting speeds of 125, 140 and 185 rev/min on the workpiece of Ti-6A1-4V using TiCN cutting tool inserts. The depth of cut and feed rate were remained constant at 0.2 mm and 0.15 mm/rev, respectively. The cutting tools undergo 30 times turning process in a length of 200 mm per cycle at three different cutting speeds. The tool life was calculated using Taylor’s equation and surface roughness of the workpiece was measured using portable Surface Roughness. The wear mechanism was examined using Scanning Electron Microscope (SEM). The tool life is decreased dramatically while the tool wear and surface roughness of the workpiece increased as the rotational cutting speeds increased. The increasing of the average roughness illustrates the low quality of the surface finish. The wear mechanism acting on the tools were found to be flank wear and crater wear. It was found that diffusion of carbon between the cutting tool and workpiece material occurred during the machining
Teknik ceramah Muhamad Anwar Ali Badarudin di Masjid Bustanul Mu'minin Bojonegoro
Full text linkMasjid Bustanul Mu’minin adalah masjid yang terletak di Bojonegoro, sebelumnya, kegiatan keagamaan dimasjid ini sangatlah minim, Setelah adanya Anwar Badarurin yang berceramah setiap jum’at wage kemudian membuat aktivitas keagamaan tahlilah mulai aktif kembali dan karena kehadiranya, mad’unya kian bertambah. Penelitian ini, di fokuskan untuk menjawab permaslahan tentang bagaimana teknik ceramah Muhamad Anwar Ali Badarudin yang meliputi teknik persiapan ceramah seperti: teknik persiapan fisik, mental, dan materi. juga tentang teknik pembukaan dan teknik penutupan ceramah. Untuk mengidentifikasi persoalan tersebut, peneliti menggunakan analisis kualitatif deskriptif, dengan menggunakan analisis model Miles dan Huberman. Data yang di gunakan berupa hasil wawancara tak terstruktur, observasi, dokumentasi. Dari hasil penelitian, dapat di ketahui bahwa teknik persiapan fisik Anwar Badarudin adalah berolah raga di sawah dan menghindari rokok. Sedangkan teknik persiapan mentalnya adalah sholat tahajud, dhuha, beristighfar, berpuasa, bergaul dengan dengan siapa saja, berkunjung pada rumah guru. Untuk teknik materi di sesuaikan dengan topik, membaca buku-buku pidato. Teknik pembukaan Anwar Badarudin adalah dengan mengucap salam, mengajak jama’ah mengucap syukur memuji Allah dan Rasul, menyapa jama’ah yang hadir, membaca doa menyebutkan contoh nyata, menghubungkan dengan peristiwa yang di peringati dan langsung menyebutkan topik. Sedangkan untuk teknik penutupan adalah menyampaiakan kesimpulan, mendorong khalayak untuk bertindak. Penelitian ini membahas teknik pembukaan dan penutupan sedangkan untuk teknik persiapan hanyalah sebagai pelengkap. Keterbatasan penelitian ini hanya membahas tentang teknik persiapan, pembukaan, dan penutupan. Peneliti belum mengkaji tentang teknik penyampaian nya. Untuk itu peneliti merekomendasikan kepada pembaca atau peneliti lainya agar pengembangan penelitian serta menjadikan penelitian ini sebagai acuan dalam penelitian berikutnya
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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