1,721,137 research outputs found
Sulfide mineralogy of the Suurikuusikko (Kittilä) gold deposit : a comparative study of the Au-rich Rimpi ore zone and the Au-poor Pikkurouravaara area
Get PDFThe Suurikuusikko orogenic Au-deposit is located in the Central Lapland Greenstone Belt within the Kittilä Group volcano-sedimentary sequence. The deposit is hosted by almost vertically dipping Kiistala Shear Zone (KiSZ). In the Suurikuusikko Au-deposit, gold occurs mainly as refractory gold within the arsenopyrite and the pyrite. The Rimpi orebody is the northernmost orebody of the Suurikuusikko deposit. Pikkurouravaara is a unit located to the northeast of the KiSZ that also has arsenopyrite and pyrite with Au as refractory in the main zone; however, in Pikkurouravaara the Au-content is not significant.
The goal of this work was to examine using mineralogical tools as distribution of Au in Rimpi and Pikkurouravaara. Studying the mineralogy of the Rimpi also provides information on whether the Rimpi orebody is similar to the other orebodies in the Suurikuusikko deposit. The methods used were optical- and reflective light microscopy, FE-SEM, EPMA, and LA-SC-ICP-MS.
Petrographical observations show that the main minerals, texture, and alteration are the same in Rimpi and Pikkurouravaara. The main sulfides, arsenopyrite and pyrite, are also the same, however, morphology and habit are different. In Pikkurouravaara the sulfide grains are larger and more homogenous, while in Rimpi sulfides are more frequently zoned. Also, the trace element content of the sulfides between the study areas was significantly different. In Pikkurouravaara Se, Ni, and Mo occurrence is elevated in arsenopyrite as are Se, Cr, Ni, and Co in pyrites relative to Rimpi. Most likely, Pikkurouravaara and Rimpi are of different generations and enrichment of Au in Rimpi sulfides reflects the episodic formation of the sulfides.
Some of the arsenopyrite and pyrite grains in Rimpi host visible gold between the sulfide grains and in fractures. These visible Au-bearing samples were compared to those Rimpi samples where Au occurs only as refractory. In samples with visible gold, the average Au grade in arsenopyrite and pyrite is relatively higher than in samples where Au is only refractory. Also, the S-content is higher in the former. The As-grades were equally variable in both Rimpi types.
The average Au grade in arsenopyrites from Rimpi is 340 - 410 ppm, which is coherent with the previously reported average values of 398 ppm. The average gold content of Rimpi pyrites is 14 – 24 ppm, which is significantly lower than the previously reported average of 235 ppm.
The major- and trace element data with mineral morphology suggests that the geological history of Pikkurouravaara has been less episodic than in Rimpi
PERAN USAHA RIMPI PISANG DALAM MENINGKATKAN TARAF EKONOMI MASYARAKAT MENURUT PERSPEKTIF EKONOMI ISLAM (Studi Kasus di Parit Retih Desa Pulau Palas Kecamatan Tembilahan Hulu)
Get PDFSkripsi ini ditulis berdasarkan latar belakang
tentang kemajuan usaha rimpi pisang, lamanya usaha yang telah berjalan dan bisa
bersaing dengan usaha lainnya, peranan usaha rimpi pisang tersebut dapat
meningkatkan perekonomian masyarakat walaupun masih terdapat kendalakendala
tetapi masih bisa teratasi. Permasalahan pada penelitian ini adalah
bagaimana proses produksi, peranan usaha dalam meningkatkan perekonomian
masyarakat dan bagaimana tinjauan ekonomi Islam terhadap usaha tersebut.
Penelitian ini bertujuan untuk mengetahui bagaimana proses produksi, peranan
usaha dalam meningkatkan ekonomi masyarakat dan bagaimana perspektif
ekonomi Islam terhadap usaha tersebut.
Jenis penelitian ini adalah penelitian lapangan (field research) yang
berlokasi di Parit Retih Desa Pulau Palas Kecamatan Tembilahan Hulu.
Subyeknya adalah pihak-pihak yang terkait dengan usaha tersebut, sementara
obyeknya adalah peran usaha dalam meningkatkan ekonomi masyarakat. Populasi
dalam penelitian ini berjumlah 43 orang yang terdiri dari 5 orang pemilik usaha
rimpi pisang, 29 orang karyawan usaha, 9 orang distributor rimpi pisang. Karena
populasi masih terjangkau oleh peneliti maka penulis menggunakan total
sampling. Sumber data penelitian ini diperoleh dari dua sumber yaitu data primer
dan skunder dengan mengguna kanmetode observasi, wawancara, angket dan
tela’ahpustaka. Data dianalisa dengan menggunakan metode deskriptif analitis,
sedang penulisannya menggunakan metode deskriptif kualitatif. Lokasi penelitian
yaitu Parit Retih Desa Pulau Palas mempunyai ketinggian satu hingga empat
meter dari permukaan air laut, keadaan tanahnya sebagian besar terdiri dari tanah
gambut dan endapan sungai serta rawa-rawa. Dan digolongkan sebagai daerah
beriklim tropis basah.
Rimpi pisang merupakan makanan tradisional yang berasal dari
Kalimantan. Rimpi pisang terbuat dari buah pisang yang masak dengan cara
pengasapan untuk menghilangkan bakteri-bakteri kemudian dikeringkan
menggunakan sinar matahari 3-5 hari, berat satu bahan baku rimpi pisang
menghasilkan ±25% rimpi pisang. Usaha ini dapat membantu perekonomian
masyarakat di wilayah tersebut, walaupun masih terdapat kendala dibeberapa
bidang. Dengan adanya usaha rimpi pisang yang ada di Desa Pulau Palas ini dapat
menigkatkan perekonomian pengusaha dan perekonomian masyarakat sekitar.
Usaha ini berperan dalam menciptakan lapangan pekerjaan untuk mengurangi
adanya pengangguran dan mampu meningkatkan perekonomian masyarakat
vi
sekitar Desa Pulau Palas, usaha rimpi pisang yang ada di desa tersebut tidak
bertentangan dengan prinsip ekonomi Islam dan dapat meningkatkan pendapatan,
baik pengusaha, karyawan serta distributor, karena kebersihan produk, kehalalan
produk dan kebaikan produk yang selalu diperhatikan
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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