1,720,964 research outputs found
Interpretasi Data Anomali Magnetik di Daerah Wakal, Maluku Tengah
Full text linkPengetahuan tentang litologi batuan penyusun bawah permukaan merupakan suatu kajian yang perlu dipahami dengan baik oleh pemerintah setempat. Hal ini penting untuk lakukan guna mengetahui potensi sumber daya mineral ekonomis maupun terkait penyusun lapisan batuan bawah permukaan di suatu area. Di daerah Wakal informasi tersebut belum diketahui. Umumnya metode yang digunakan untuk memperoleh gambaran material bawah permukaan adalah geomagnet. Tujuan penelitian ini adalah mampu menginterpretasi material yang tersebar di daerah penelitian berdasarkan nilai medan magnet. Metode ini memanfaatkan anomali medan magnet untuk mengidentifikasi mineral tersebut. Data yang digunakan berjumlah 31 titik dengan spasi pengukuran sejauh 5 meter. Interpretasi dilakukan secara kualitatif dan kuantitatif menggunakan software Surfer, Magpick, dan Mag2dc. Hasil penelitian diperoleh peta kontur anomali magnetik yang memiliki harga antara -1000 nT hingga 900 nT. Hasil sayatan lintasan A-A’ diperoleh nilai suseptibilitas yang bervariasi yaitu material bawah permukaan yang terdiri atas metamorphic (60 nT) dan av. sedimentary (10 nT) cenderung memiliki anomali residual magnetik rendah sedangkan basalt (129.54 – 131.07 nT) dan andesite (168.12 nT) memiliki anomali residual yang relatif tinggi yang terdistribusi dari Barat Laut hingga Tenggara dari area pengukuran
Identifikasi Potensi Reservoar Batupasir Menggunakan Atribut Seismik di Lapangan “Aru” Cekungan Jawa Barat Utara
Full text linkTelah dilakukan penilitian di Lapangan “Aru” yang merupakan lapangan migas di Cekungan Jawa Barat Utara. Penggunaan data konvensional untuk identifikasi potensi reservoar batupasir dan sebarannya di daerah penelitian masih kurang optimal sehingga analisa dilakukan menggunakan atribut RMS Amplitude. Penelitian bertujuan untuk mengidentifikasi sebaran reservoar batupasir yang berpotensi sebagai penyimpan hidrokarbon di daerah penelitian. Data yang digunakan adalah data seismik dan data sumur. Data seismik berupa data sekunder 3D pre-stack time migration (PSTM) yang terdiri atas 381 lintasan inline dan 859 crossline dengan sampling rate 2 ms. Digunakan pula empat data sumur yang dilengkapi properti fisik dan marker reservoar kajian. Pengolahan datanya diawali dengan pembuatan sintetik seismogram untuk menyamakan horizon seismik dalam skala waktu dari data seismik terhadap posisi kedalaman sebenarnya pada data sumur. Pembuatan time structure map untuk analisa struktur tinggian dan rendahan sebagai potensi jebakan hidrokarbon. Tahap akhir pengolahan yaitu analisa sebaran reservoar batupasir yang berpotensi menyimpan hidrokarbon melalui peta anomali atribut RMS amplitude. Hasil interpretasi time structure map dari penampang reservoar 39A dan 39C secara struktural menunjukkan sumur B1 dan A4 terletak pada area tinggian dengan nilai surface elevation yaitu -1175ms sampai -1025ms. Hasil ini dikorelasi dengan peta anomali atribut RMS amplitude dari penampang reservoar 39A dan 39C namun ditunjukkan bahwa hanya area sumur B1 yang memiliki kontras yang ekstrim terhadap anomali amplitudo tinggi dengan nilai -103 hingga -303 yang penyebarannya hingga ke arah Utara. Kontras anomali amplitudo tinggi ditafsirkan sebagai litologi batupasir terisi hidrokarbon. Hasil ini berkorelasi juga dengan well test sumur B1 yang terbukti mengandung hidrokarbon
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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