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PENGARUH PERLAKUAN SLAG BALL BLASTING TERHADAP KEAUSAN, KEKERASAN, DAN KEKASARAN PERMUKAAN FEMORAL HEAD HIP JOINT PROSTHESIS YANG TERBUAT DARI BAJA TAHAN KARAT 316L
No full textKeausan merupakan hal yang krusial untuk femoral head hip joint
prosthesis. Usaha untuk meningkatkan ketahanan aus femoral head perlu
memperhatikan sisi ekonomi. Perlakuan sandblasting dengan menggunakan slag ball
atau dikenal dengan perlakuan slag ball blasting memiliki potensi untuk
meningkatkan ketahanan aus femoral head secara sederhana dan murah. Penelitian ini
dilakukan untuk mengetahui pengaruh perlakuan slag ball blasting terhadap keausan,
kekerasan, dan kekasaran permukaan femoral head yang terbuat dari baja tahan karat
316L.
Perlakuan slag ball blasting dilakukan dengan menembakkan partikel slag
ball ke permukaan spesimen yang berputar dengan kecepatan 60 rpm. Partikel slag
ball memiliki diameter yang berkisar dari 1-2 mm dan didorong oleh aliran udara
bertekanan 5-8 kg/mm2. Spesimen memiliki diameter 38 mm dan tebal 5 mm. Durasi
perlakuan adalah 5, 10, 15, 20, 25, dan 30 menit. Pengujian kekerasan, kekasaran
permukaan, keausan, pengamatan struktur mikro, dan morfologi permukaan
dilakukan untuk mendapatkan hasil yang optimal.
Berdasarkan hasil penelitian, perlakuan slag ball blasting meningkatkan
kekerasan dan kekasaran permukaan femoral head. Perlakuan ini menghasilkan 3
tahap perubahan keausan: 1) peningkatan pada 10 menit awal, 2) penurunan dari 10
hingga 20 menit, dan 3) nilai relative konstan di atas 20 menit. Hasil ini menunjukkan
bahwa perlakuan slag ball blasting pada durasi 20 menit mampu menghasilkan
femoral head baja tahan karat 316L dengan ketahanan aus yang lebih baik dan biaya
murah
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
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
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
Perancangan Sepeda Roda Tiga Pasca Stroke Dengan Mekanisme Penggerak Elektrik
Get PDFKonstruksi sepeda roda tiga memiliki keseimbangan yang baik dan dapat meminimalisir resiko terguling sehingga aman menjadi media rehabilitasi fisik bagi penderita stroke dan sangat berguna dalam memulihkan pergerakan motorik pada kaki dan mengurangi tekanan hidup penderita stroke. Namun, pada kondisi tertentu seperti di tanjakan dan kelelahan, penderita stroke tidak memiliki cukup tenaga untuk mengayuh sepeda ke rumah mereka. Oleh karena itu, perlu dirancang sebuah mekanisme penggerak elektrik (electric support) dengan motor listrik pada sepeda roda tiga konvensional dan dilengkapi dengan baterai untuk menyimpan sumber listrik, disamping dapat dikayuh secara manual. Dengan tujuan, penderita stroke dapat kembali pulang dengan menyalakan motor listrik yang membuat kayuhan menjadi lebih ringan terlebih lagi di jalan menanjak. Penelitian ini dilakukan dengan cara menentukan tenaga dorong yang diperlukan, merancang dan menyeleksi konsep mekanisme gerak sepeda elektrik, kemudian menganalisa kekuatan material pada rangka dan keergonomisan berkendara. Hasil yang didapat dari penelitian ini berupa rancangan sepeda roda tiga elektrik model delta dengan dimensi panjang sepeda 1.5 meter, jarak antara roda belakang adalah 0.66 meter, dan tinggi sepeda 1.1 meter. Mekanisme penggerak elektrik terdiri dari motor listrik 500W bertipe mid-drive dengan Pedal Assistance Sensor (PAS) dan baterai Lithium berkapasitas 48V-14Ah. Rancangan sepeda ini mampu menahan beban pengendara maksimal 100 kg, dan akan digunakan di jalan menanjak. Material rangka adalah AISI Alumunium 6061 dengan tegangan yang diijinkan sebesar 277.6±8.3 MPa. Hasil analisis kekuatan material menunjukkan tegangan kritis rangka sebesar 84.932 MPa terjadi pada daerah pertemuan pipa seat stay dan sandaran. Tegangan kritis yang terjadi lebih kecil daripada tegangan yang diijinkan sehingga dinyatakan aman.
Kata Kunci: pasca stroke, sepeda roda tiga listrik, sensor bantuan pedal, fram
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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