1,720,967 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
KAJIAN REZIM HIDROLOGI DAN SALINITAS DAS LANDAK- KAPUAS DALAM RANGKA PENGEMBANGAN SUMBER AIR BAKU SPAM REGIONAL PONTIANAK - ZONA HUJAN EQUATORIAL
Full text linkAbstrak: Adanya rencana pembangunan berkelanjutan di kawasan pesisir kapuas menuju Kota Metropolitan Pontianak, memerlukan sumber air baku yang layak dari segi kualitas, kuantitas dan kontinuitas sesuai standar nasional. Dari segi kuantitas, ketersediaan air baku cukup berlimpah, namun dari segi kualitas, sumber air baku Kota Pontianak terancam interusi air laut pada tahun normal dan tahun kering di musim kemarau. Saat ini, cakupan layanan PDAM di wilayah Regional Pontianak baru mencapai 45% dari total penduduk 1.022.269 jiwa (2010). Kualitas air hasil produksi PDAM juga kurang stabil dampak dari kualitas air baku tidak memadai (warna tinggi dan kadar klorida diatas ambang batas saat kemarau) sehingga kualitas air yang diterima pelanggan tidak layak minum. Penelitian ini membahas mengenai rezim hidrologi untuk keandalan sumber air baku (kualitas dan kuantitas) dari Sungai Ambawang interbasin Sungai Landak (Biyung) yang terpilih dijadikan sumber air baku yang barudalam pengembangan infrastruktur air minum Regional Pontianak. Hasil penelitian menunjukkan bahwa Sungai Ambawang secara periodik terpengaruh pasang surut yang berpoten si terinterusi air laut, sehingga dibangun bendungan untuk memutus salinitas. Sedangkan Sungai Landak (Biyung) memiliki debit yang acak dan dipengaruhi oleh curah hujan. Hasil pembagian debit Discrit Markov terhadap nilai salinitas menunjukkan bahwa, salinitas tertinggi terjadi pada iklim kering, bulan kering dan debit harian kering dimana amplitudo pasut di muara sungai maksimum. Debit harian minimum Sungai Landak tercatat pada tahun 1997 sebesar 21 m3/detik analog dengan debit rencana R20 1 harian sebesar 23,38 m3/detik. Kebutuhan air baku Regional Pontianak sampai dengan tahun 2030 sebesar 4,6 m3/det sedangkan debit untuk alokasi air minum enggunakan debit 20 tahun kering, R20 kering pada Sungai Ambawang sebesar 12,05 m3/det, sehingga sampai dengan tahun 2030 kebutuhan air baku Regional Pontianak dapat terpenuhi. Kata kunci: air baku, air minum, Regional Pontianak, salinitas, Sungai Ambawang, Sungai Landak. Abstract : The existence of sustainable development plan inkapuas coastal areas towardPontianak Metropolitan Cities, requires a decent source of raw water in terms of quality, quantity and continuity according to national standards. In terms of quantity, availability of raw water is quite abundant, but in terms of quality, raw water source is threatened sea water interution in normal and dry years in the dry season. Currently, the services coverageof PDAM in the area of Regional Pontianak only reached 45% of the total population of 1,022,269soul (2010). Water quality output PDAM is also unstable, impact of inadequate water quality (high color and chloride levels above the threshold when dry) so that customers receive quality water unfit to drink. This study discusses the hydrological regime for the reliability of raw water source (quality and quantity) of interbasin Ambawang River Landak River (Biyung) were selected as new raw water source for drinking water infrastructure development Regional Pontianak. The results showed that Ambawang River periodically affected by tidal and seawater interution, so the dam was built to break salinity. While the Landak River (Biyung) has a random discharge and is influenced by rainfall. The result of the division of discharge Discrit Markov against salinity values showed that, the highest salinity occurs in dry climates, dry month and daily discharge dry where the amplitude tidal estuary maximum. The minimum daily discharge Landak River recorded in 1997 at 21 m3 / sec analog with R20 daily discharge plan of 23.38 m3/ sec. Pontianak Regional raw water needs of 4.6 m3 / sec in the 2030, while the used discharge for the allocation of drinking water a debit 20 years of dry, dry R20 on the River Ambawang of 12.05 m3/sec, so the 2030 needs raw water Regional Pontianak can be met. Key words: raw water, drinking water, Regional Pontianak, salinity, Ambawang River, Landak Rive
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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