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RANCANGAN GEOMETRI LERENG TAMBANG BATUBARA BLOK II DAN III DI PT. DUTA TAMBANG SUMBER ALAM, KABUPATEN NUNUKAN PROVINSI KALIMANTAN UTARA
Get PDFPT. Duta Tambang Sumber Alam (PT. DTSA) merupakan salah satu perusahaan tambang batubara yang berlokasi di daerah Seimenggaris, Kabupaten Nunukan, Provinsi Kalimantan Utara. PT. DTSA berencana melakukan pengembangan penambangan pada blok II dan III sehingga membutuhkan rekomendasi geoteknik berupa rancangan geometri lereng yang aman.
Data masukan untuk pemodelan geoteknik blok II dan III diwakili oleh empat lokasi pemboran yaitu lubang Bor A2-GT02 dan A2-GT03 untuk blok II, serta A3-GT01 dan A3-GT02 untuk blok III, kemudian dibuat Sayatan yaitu Sayatan A-A’ melewati lubang Bor A2-GT03, Sayatan B-B’ melewati lubang Bor A2-GT02, dan Sayatan C-C’ melewati lubang Bor A3-GT01 dan A3-GT02. Dari ubang bor dilakukan pengambilan sampel dan dapat diketahui litologi perlapisan batuan. Sampel batuan selanjutnya dilakukan pengujian uji sifat fisik, uji kuat ekan, dan uji kuat geser langsung. Data masukan material yang digunakan antara ain bobot isi kering (γ
d
) dan bobot isi jenuh (γ
), serta kohesi (C) dan sudut geser dalam (). Kondisi air tanah diasumsikan pada kondisi kering, setengah jenuh, dan
s
enuh. Pemodelan geoteknik dilakukan menggunakan bantuan program Slide 6.0 dengan metode kesetimbangan batas. Pemodelan rancangan lereng tunggal dibuat dengan ketinggian lereng 6 m, 10 m, dan 15 m, dengan sudut kemiringan lereng 60°, 70° dan 80°. Lereng keseluruhan disimulasikan dengan tinggi lereng 26 m, 36 m, 46 m, dan 56 m dengan sudut 35°, 40°, 45° dan 50° untuk semua ketinggian. Pemodelan lereng Lowwall dengan asumsi lereng terbentuk dari ketinggian maksimum hingga main seam terdalam.
Kemungkinan longsor yang terjadi pada lereng adalah longsor busur. Rekomendasi geometri lereng tunggal untuk semua jenis material adalah tinggi 10 m dan sudut 60°. Analisis kemantapan lereng lowwall dengan acuan FK > 1,50, diperoleh nilai FK=3,33 (blok II) dan FK=2,77 (blok III), jadi dapat dikatakan aman. Rekomendasi lereng highwall pada masing-masing blok, yaitu blok II : Tinggi 56 m, Sudut 40°, dengan nilai FK 1,59, dan blok III : Tinggi 56 m, Sudut 50°, dengan nilai FK 1,65. Asumsi kondisi air tanah jenuh. Rekomendasi geometri lereng didasarkan pada nilai FK aman paling minimum, yaitu FK ≥ 1,30 untuk lereng tunggal dan FK ≥ 1,50 untuk lereng keseluruhan. Pada lereng highwall, nilai Faktor Keamanan (FK) terbesar didapat pada ketinggian 26 m dengan sudut kemiringan 35°, dan nilai FK terkecil pada ketinggian 56 m dengan sudut kemiringan 50°. Lereng keseluruhan dalam kondisi Jenuh, nilai FK di blok II berkisar antara 3,40 – 1,41, blok III antara 3,68 – 1,65, dan lowwall kedua blok antara 2,77 – 3,33. Dalam kondisi kering, nilai FK di blok II berkisar antara 4,42 – 2,09, blok III antara 5,51 – 2,62, dan Lowwall kedua blok antara 7,00 – 9,07
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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