1,720,958 research outputs found
ANALISIS PERBEDAAN KADAR ENDAPAN BIJIH NIKEL SAPROLIT ANTARA HASIL EKSPLORASI DENGAN REALISASI PENAMBANGAN PADA BLOK GC PULAU GEE KABUPATEN HALMAHERA TIMUR PROVINSI MALUKU UTAR
No full textPT. Aneka Tambang Tbk, unit Geomin merupakan bagian dari PT. ANTAM yang membidangi masalah Eksplorasi di daerah pulau Gee, yang kemudian penambangannya dilakukan oleh PT. Minerina Bhakti dilakukan dengan sistem penambangan terbuka. Tingkat validitas dari data eksplorasi akan terbukti setelah dilaksanakannya kegiatan penambangan, namun pada kenyataannya sering terjadi perbedaan antara data hasil ekplorasi dengan realisasi penambangan, maka penelitian ini akan menganalisa sebab-sebab terjadinya perbedaan kadar hasil ekplorasi dengan realisasi penambangan, serta faktor-faktor penyebab terjadinya perbedaan kadar tersebut. Adapun titik bor yang tertambang pada bulan Juni adalah 19 titik bor dengan kadar Ni eksplorasi rata-rata 2,20 % dan kadar penambangan 2,27 % sedangkan bulan Juli sebanyak 16 titik bor dengan kadar rata-rata Ni 2,23 % dan kadar rata-rata penambangan 2,20 %. Selisih kadar Ni antara eksplorasi dengan realisasi penambangan pada bulan Juni adalah 0,07 % dan pada bulan Juli adalah 0,04 %. Berdasarkan hasil penelitian, maka diketahui penyebab terjadinya perbedaan kadar Ni antara hasil eksplorasi dan produksi adalah: penyebaran deposit yang tidak merata, pengotoran dan kehilangan bijih saat penambangan, cara pengambilan sampel, air hujan, dan kesalahan manusia PT. Aneka Tambang Tbk, Geomin unit is part of PT. ANTAM is in charge of exploration issues in the Gee island area, which is then carried out by PT. Minerina Bhakti is carried out with an open mining system. The level of validity of exploration data will be proven after mining activities are carried out, but in reality there is often a difference between the exploration data and the realization of mining, so this study will analyze the causes of differences in exploration results with mining realization, as well as the causes of differences these levels. The drill points mined in June are 19 drill points with exploration Ni content of 2.20% and mining levels 2.27% while July is 16 drill points with an average Ni content of 2.23% and average mining levels 2.20%. Ni difference between exploration and mining realization in June was 0.07% and in July it was 0.04%. Based on the results of the study, it is known that the causes of differences in Ni content between the results of exploration and production are: distribution of uneven deposits, contamination and loss of ore during mining, sampling method, rainwater, and human error
Evaluasi Investasi Dan Sewa Alat Untuk Kegiatan Pengupasan Overburden Dan Penggalian Bijih Nikel Di Bukit Gc Pada Kmpra Pulau Gee Kec. Maba Kab. Halmahera Timur
Get PDFKMPRA adalah salah satu perusahaan yang bergerak dalam bidang pertambangan Nikel, dengan lokasi penambangan terletak di Pulau Gee, Kecamatan Maba, Kabupaten Halmahera Timur Propinsi Maluku Utara. Dalam memperlancar produksinya, KMPRA membuka beberapa lahan baru yang memiliki COG 2,5 %, salah satunya adalah bukit GC yang terletak diwilayah utara. Bukit GC yang akan ditambang seluas 19,17 Ha, cadangan bijih nikel yang akan digali sebesar 1.374.489 m3 dan Overburden (OB) yang akan dikupas 657.531 m3 dengan target produksi oleh perusahaan sebesar 250.000 ton/tahun dengan Mining Recovery 85 % dengan lama penambangan 5 tahun.Untuk pengadaan alat-alat mekanis (alat dororng Bulldozer dan alat gali Excavator). Untuk kegiatan pengupasan overburden dan penggalian ore bukit GC, akan dilakukan dengan menggunakan 2 metode yaitu antara investasi alat baru dan sewa alat. Pemilihan 2 metode ini berdasar pada nilai ekonomis alat apabila digunakan dalam kagiatan tersebut. Berdasarkan data cadangan,umur tambang,harga alat baru,depresiasi,pajak dan biaya operasional alat untuk investasi alat baru serta biaya sewa alat, besarnya biaya yang akan digunakan oleh alat dari masing-masing metode tersebut dapat dihitung dengan menggunakan analisis ekonomi Present Worth Cost (PWC) dan Future Worth Cost (FWC)
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
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