1,720,973 research outputs found
Screening Awal Potensi Bahan Galian Industri di Kalimantan Barat sebagai Bahan Pembuatan Panel Surya
Full text linkPemanfaatan energi terbarukan untuk mereduksi penggunaan energi fosil saat ini menjadi perhatian penting di seluruh dunia. Salah satu energi terbarukan yang memiliki potensi cukup besar adalah energi surya. Dalam energi surya, radiasi matahari diubah menjadi arus listrik dengan menggunakan panel surya yang bahan bakunya terbuat dari bahan semikonduktor. Bahan semikonduktor yang biasa digunakan dan mudah diperoleh adalah silikon dalam bentuk senyawa silika (SiO2) pada mineral kuarsa. Indonesia memiliki potensi mineral kuarsa yang melimpah. Namun, pemanfaatan mineral tersebut sebagai bahan baku panel surya masih belum terlalu masif. Oleh karena itu, penelitian ini dilakukan untuk melakukan screening awal dan mengetahui potensi bahan galian (pasir kuarsa dan kaolin) dari beberapa daerah di Kalimantan Barat (Mempawah, Singkawang, dan Bengkayang) serta mengetahui kelayakannya sebagai bahan baku panel surya. Dalam penelitian ini, telah dilakukan pengambilan sampel dari beberapa daerah di Kalimantan Barat. Sampel tersebut kemudian dipreparasi dan dianalisis dengan metode XRF, untuk diperoleh karakteristiknya untuk dibandingkan dengan kriteria pasir kuarsa sebagai bahan pembuatan panel surya. Berdasarkan hasil analisis, pasir kuarsa dari beberapa daerah di Kalimantan Barat berpotensi untuk dijadikan sebagai bahan pembuatan panel surya sebab memiliki kandungan SiO2 yang cukup tinggi (70-90%). Sampel pasir kuarsa belum memenuhi kriteria sebagai bahan baku panel surya. Perlu dilakukan usaha pemurnian untuk meningkatkan kadar SiO2 dan menurunkan kadar Fe2O3, TiO2, dan Al2O3
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
KAJIAN RENCANA REKLAMASI LAHAN BEKAS PENAMBANGAN BATU GRANODIORIT PT. TOTAL OPTIMA PRAKARSA DI DESA PENIRAMAN KABUPATEN MEMPAWAH KALIMANTAN BARAT
Full text linkKegiatan penambangan batuan dengan mengggunakan metode tambang terbuka (quarry) akan menimbulkan dampak negatif terhadap perubahan rona lingkungan berupa penurunan produktivitas lahan, terjadinya erosi dan sedimentasi, terjadinya gerakan tanah atau longsoran, terganggunya flora dan fauna serta berdampak terhadap perubahan iklim mikro, oleh karena itu diperlukan perencanaan reklamasi yang baik untuk meminimalisir dampak tersebut. Tujuan penelitian ini untuk menentukan rencana teknis reklamasi, serta menentukan metode penanaman dan jumlah tanaman yang digunakan untuk kegiatan reklamasi. Metode penelitian yang dilakukan yaitu dengan pengamatan secara langsung di lapangan, menentukan luas rencana reklamasi dengan pemetaaan, pengolahan dan analisis data untuk menentukan kebutuhan overburden dan top soil dalam kegiatan penataan lahan dengan menggunakan metode perataan tanah. Serta perencanaan sistem drainase berdasarkan data curah hujan 10 tahun terakhir. Hasil penelitian diperoleh rencana teknis kegiatan reklamasi terdiri dari persiapan lahan, kegiatan penataan lahan, dan revegetasi. luas rencana reklamasi adalah 0,44 hektar, jumlah kebutuhan overburden dan top soil untuk kegiatan penataan lahan dengan ketebalan overburden 60 cm dan top soil 40 cm yaitu 3.300 LCM dan 2.200 LCM. Jumlah tanaman kelapa yang dibutuhkan untuk revegetasi yaitu sebanyak 57 bibit kelapa. Teknis penanaman dimulai dari pemasangan ajir, pembuatan lubang tanam, pemberian pupuk kandang, penanaman bibit kelapa, dan pemeliharaan selama 1 tahun. Kata Kunci: Overburden, Reklamasi, Revegetasi, Top soi
RANCANGAN GEOMETRI PELEDAKAN YANG EFISIEN UNTUK MENDAPATKAN DISTRIBUSI UKURAN FRAGMENTASI BATU GAMPING
No full textThe rock fragmentation distribution resulting from blasting is one of the important factors of the blasting method design model for dismantling excavated materials. Calculation of rock fragmentation resulting from blasting using the RL theory. Ash, CJ. Konya, and ICI-Explosive. The method for determining the size of rock fragmentation resulting from blasting and analysis of the fragmentation size distribution in blasting activities uses the Kuz-Ram method and Split Desktop 4.0 software. A good blasting geometry design from a technical and economical point of view enables achieving target production according to the design made by the company in producing an average fragmentation size of limestone <50 cm. Blasting geometry applied by PT. Semen Padang produces a hole volume of 275 m3 with a fragmentation of 53.46 cm. The results of the fragmentation design are based on the RL Ash theory and the Kuz-Ram method with a volume of300.67 m3each hole anda fragmentation size of 50.07 cm, CJ. Konya analysis resulted in a hole volume of 422.4 m3 with an average fragmentation of 44.17 cm, and ICI-Explosive method resulted in a hole volume of 285 m3 with an average fragmentation of 47.86 cm. Based on blasting geometry calculation, fragmentation analysis and economic calculations, it is shown that the blasting geometry suggestion using CJ Konya theory is more optimal and feasible to apply because it results in a larger hole blasting volume, higher percentage of fragmentation of <50 cm which is compatible with the bucket capacity, as well as higher revenue and profit compared to the other two methods.Distribusi fragmentasi batuan hasil peledakan menjadi salah satu faktor penentu keberhasilan dari model rancangan metode peledakan untuk pembongkaran material galian. Perhitungan fragmentasi batuan hasil peledakan menggunakan teori R.L. Ash, C.J. Konya, dan ICI-Explosive. Metode untuk mengetahui ukuran fragmentasi batuan hasil peledakan dan analisis distribusi ukuran fragmentasi pada kegiatan peledakan menggunakan metode Kuz-Ram dan software Split Desktop 4.0. Desain rancangan geometri peledakan yang baik dari segi teknis dan ekonomis dapat menghasilkan target produksi sesuai dengan rancangan yang dibuat oleh perusahaan dalam menghasilkan ukuran fragmentasi rata-rata batu gamping <50 cm. Geometri peledakan yang diterapkan oleh PT. Semen Padang menghasilkan volume perlubang 275 m3 dengan fragmentasi 53,46 cm. Hasil dari rancangan fragmentasi berdasarkan pada teori R.L. Ash dan metode Kuz-Ram menghasilkan volume perlubang sebesar 300,67 m3 dan ukuran fragmentasi sebesar 50,07 cm. Sementara itu, analisis metode C.J. Konya menghasilkan volume perlubang sebesar 422,4 m3 dengan ukuran fragmentasi rata-rata 44,17 cm, dan metode ICI-Explosive menghasilkan volume perlubang sebesar 285 m3 dengan ukuran fragmentasi rata-rata 47,86 cm. Berdasarkan perhitungan geometri peledakan, analisis fragmentasi serta perhitungan keekonomian menunjukkan bahwa geometri peledakan usulan menggunakan teori C.J. Konya lebih optimal dan memungkinkan untuk diterapkan karena menghasilkan volume peledakan perlubang yang lebih besar, persentase fragmentasi <50 cm yang lebih tinggi sesuai dengan kapasitas bucket, serta total pendapatan dan keuntungan yang lebih besar dibandingkan dengan dua metode lainnya
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
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