1,720,967 research outputs found
KARAKTERISASI RESERVOIR UNTUK MENENTUKAN PERSEBARAN BATUPASIR PEMBAWA HIDROKARBON MENGGUNAKAN INVERSI SIMULTAN
Full text linkDalam exploitasi hidrokarbon, salah satu tantangan yang paling penting adalah pemetaan persebaran batuan reservoir dan fluida pengisinya. Salah satu metode yang digunakan adalah inversi simultan. Inversi simultan merupakan salah satu teknik inversi seismik yang mengekstraksi data AVO untuk memperoleh nilai impedansi seismik dari data seismik Pre-Stack hingga memperoleh nilai impedansi P dan S serta densitas. Salah satu metode lanjutan yang paling umum dipakai adalah metode Lambda-Mu-Rho (LMR) untuk membatu identifikasi litologi dan fluida resorvoir. Penelitian dilakukan dengan menggunakan data dari Lapangan Nova Scotia, dengan target pada batupasir Formasi Missisauga. Data yang digunakan adalah data sumur L-30 dan B-41 dan data seismik 3D PSTM. Sumur B-41 berada di struktur lebih tinggi dari sumur L-30 namun tidak menghasilkan hidrokarbon. Log Vs dibuat sintetik menggunakan metode Fluid Replacement Modeling dan LMR diturunkan dengan transformasi log Vp, Vs dan densitas. Hasil pemetaan zona target pada kedalaman 2095-2250 ms yaitu dengan menggunakan range cut-off Lambda-Rho 17-22 Gpa*g/cc dan Mu-Rho 20-28 Gpa*g/cc maka didapat peta persebaran batuan reservoir dan hidrokarbon. Hasil interpretasi dari peta sebaran menunjukkan sumur B-41 adalah dry hole karena lapisan batupasir mempunyai nilai Mu-Rho rendah yang diakibatkan lapisan tipis dan perselingan dengan batulempung
Fault Interpretation Based on Similarity and Curvature Attributes in F3 Netherlands: Interpretasi Sesar Berdasarkan Atribut Similarity dan Curvature di Lapangan F3 Netherlands
No full textF3 Southern North Sea Netherlands Basin field is an oil and gas field that has a complex fault structure and stratigraphy due to compressional tectonic movements during the Late Cretaceous and Tertiary eras. Information on the presence of faults can act as a trap or migration which then greatly affects oil and gas production and the injection process. A seismic attribute analysis of similarity and curvature was used to interpret the presence of fault structures to obtain information on the presence of subsurface faults in the F3 Netherlands field. The interpretation of the similarity attribute calculation results shows that the faults are marked with a minimum similarity value of 0.77, 0.68, and 0.66 at the time slices Z = 400ms, 1700ms, and 1800ms. The maximum value of most post-positive curvature represents the presence of an ascending fault block and the maximum value of the most negative curvature represents the presence of a descending fault block at the same time incision. Based on the similarity and curvature attribute calculations, it can be interpreted that the major faults in Top Zechstein to Upper Pliocene and the presence of successive faults on Top Zechstein to Base Lower Cretaceous are faults due to the formation of the Zechstein salt dome intrusio
EVALUASI GEOMETRI PELEDAKAN OVERBURDEN TERHADAP DIGGING TIME ALAT GALI PT ARTAMULIA TATAPRATAMA JOBSITE KUANSING INTI MAKMUR KABUPATEN BUNGO, PROVINSI JAMBI
Full text linkTanjung Belit Project merupakan salah satu dari jobsite yang dikerjakan oleh PT Artamulia Tataparatama yang terletak di Desa Tanjung Belit, Kecamatan Jujuhan, Kabupaten Bungo, PT Kuansing Inti Makmur. Pembongkaran lapisan tanah penutup dilakukan dengan metode pemboran dan peledakan. Kondisi batubara jobsite ini merupakan batubara multi seam dengan overburden batupasir dan batulempung. Tingkat kekerasan batuan ini mengakibatkan adanya masalah dalam kegiatan free digging sehingga perlu dilakukannya kegiatan pemboran dan peledakan. Peledakan ini dimaksudkan untuk memberaikan batuan dari batuan induknya sehingga bidang lemahnya dapat terberai yang akan mempermudah untuk dilakukan penggalian. Rancangan geometri yang tidak optimal pada saat ini menghasilkan distribusi fragmentasi yang kurang baik yang menyebabkan terdapatnya sebagian daerah dekat lapisan batubara yang tidak terberai sempurna oleh lubang ledak, sehingga memperlambat digging time alat gali. Perbaikan geometri peledakan dimaksudkan untuk mengatasi masalah ini. Dimana burden sebesar 5 m dan spacing sebesar 6,5 m. Berdasarkan teori RL. Ash maka direkomendasikan dengan burden 5 m dan spacing sebesar 7 m. Hasil perhitungan fragmentasi berdasarkan Kuz-Ram dari geometri yang diusulkan didapat fragmentasi yang kurang dari 130 cm sebanyak 70,64% dari sebelumnya 63,68% dengan kenaikan sebesar 6,96%. Sedangkan fragmen ukuran lebih 130 cm (boulder) sebanyak 29,36% dari sebelumnya sebesar 36,32% dengan penurunan sebesar 6,66%. Digging time geometri usulan diperoleh sebesar 8 detik dari sebelumnya 12 detik lebih cepat 4 detik. Produktivitas alat gali EX 1900 untuk material peledakan sebesar 1.146,54 BCM/jam dari awalnya sebesar 1.335,91 BCM/jam dengan kenaikan sebesar 190,37 BCM/jam
PERANCANGAN SET FURNITURE UNTUK AREA SANTAI DI PERPUSTAKAAN UNIVERSITAS SURABAYA
Full text linkAbstract –While in the library, the visitors will spend time to studying, reading books, or doing the tasks. For those who spend time in the library in a long time, certainly would not be comfortable if continue to sit in a chair with a difficult position to change. Therefore will be provided area that can make visitors comfortable and do not feel tired when in the library. The area is a lounge area, where visitors can study, read books, or do the task with a sitting position on the floor. To do these activities, then required some furnitures for the lounge area, table for ‘lesehan’ and a bookshelf. The purpose of this research is to design a set of furniture for the lounge area for visitors of Surabaya University Library as an effort to improve the function of facility in learning and research. In this research, the method used is qualitative method with IDI (In Depth Interview) on some librarians and visitors of Surabaya University Library, and observation done by observing around Surabaya University Library. From the results of the research, it will be designed a set of furniture for the lounge area of the table for ‘lesehan’ which features have a bookstrip and electric socket; as well as bookshelves that can accommodate books that have been borrowed by visitors, with the concept of modern design with a blend of futuristic concepts
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
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